Updated Cotire to 1.7.6

Updated Cotire to 1.7.6

--- CMake/cotire.cmake
+++ CMake/cotire.cmake
@@ -28,3702 +28,3800 @@
 #=============================================================================

 if(__COTIRE_INCLUDED)
-	return()
+    return()
 endif()
 set(__COTIRE_INCLUDED TRUE)

 # call cmake_minimum_required, but prevent modification of the CMake policy stack in include mode
 # cmake_minimum_required also sets the policy version as a side effect, which we have to avoid
 if (NOT CMAKE_SCRIPT_MODE_FILE)
-	cmake_policy(PUSH)
+    cmake_policy(PUSH)
 endif()
 cmake_minimum_required(VERSION 2.8.12)
 if (NOT CMAKE_SCRIPT_MODE_FILE)
-	cmake_policy(POP)
+    cmake_policy(POP)
 endif()

+set (COTIRE_CMAKE_MODULE_FILE "${CMAKE_CURRENT_LIST_FILE}")
+set (COTIRE_CMAKE_MODULE_VERSION "1.7.6")
+
 # activate select policies
+if (POLICY CMP0025)
+    # Compiler id for Apple Clang is now AppleClang
+    cmake_policy(SET CMP0025 NEW)
+endif()
+
+if (POLICY CMP0026)
+    # disallow use of the LOCATION target property
+    cmake_policy(SET CMP0026 NEW)
+endif()
+
 if (POLICY CMP0038)
-	# targets may not link directly to themselves
-	cmake_policy(SET CMP0038 NEW)
+    # targets may not link directly to themselves
+    cmake_policy(SET CMP0038 NEW)
 endif()

 if (POLICY CMP0039)
-	# utility targets may not have link dependencies
-	cmake_policy(SET CMP0039 NEW)
+    # utility targets may not have link dependencies
+    cmake_policy(SET CMP0039 NEW)
 endif()

 if (POLICY CMP0040)
-	# target in the TARGET signature of add_custom_command() must exist
-	cmake_policy(SET CMP0040 NEW)
+    # target in the TARGET signature of add_custom_command() must exist
+    cmake_policy(SET CMP0040 NEW)
 endif()

 if (POLICY CMP0045)
-	# error on non-existent target in get_target_property
-	cmake_policy(SET CMP0045 NEW)
+    # error on non-existent target in get_target_property
+    cmake_policy(SET CMP0045 NEW)
 endif()

 if (POLICY CMP0046)
-	# error on non-existent dependency in add_dependencies
-	cmake_policy(SET CMP0046 NEW)
+    # error on non-existent dependency in add_dependencies
+    cmake_policy(SET CMP0046 NEW)
 endif()

 if (POLICY CMP0049)
-	# do not expand variables in target source entries
-	cmake_policy(SET CMP0049 NEW)
+    # do not expand variables in target source entries
+    cmake_policy(SET CMP0049 NEW)
 endif()

 if (POLICY CMP0050)
-	# disallow add_custom_command SOURCE signatures
-	cmake_policy(SET CMP0050 NEW)
+    # disallow add_custom_command SOURCE signatures
+    cmake_policy(SET CMP0050 NEW)
 endif()

 if (POLICY CMP0051)
-	# include TARGET_OBJECTS expressions in a target's SOURCES property
-	cmake_policy(SET CMP0051 NEW)
+    # include TARGET_OBJECTS expressions in a target's SOURCES property
+    cmake_policy(SET CMP0051 NEW)
 endif()

 if (POLICY CMP0053)
-	# simplify variable reference and escape sequence evaluation
-	cmake_policy(SET CMP0053 NEW)
+    # simplify variable reference and escape sequence evaluation
+    cmake_policy(SET CMP0053 NEW)
 endif()

 if (POLICY CMP0054)
-	# only interpret if() arguments as variables or keywords when unquoted
-	cmake_policy(SET CMP0054 NEW)
+    # only interpret if() arguments as variables or keywords when unquoted
+    cmake_policy(SET CMP0054 NEW)
 endif()
-
-set (COTIRE_CMAKE_MODULE_FILE "${CMAKE_CURRENT_LIST_FILE}")
-set (COTIRE_CMAKE_MODULE_VERSION "1.7.3")

 include(CMakeParseArguments)
 include(ProcessorCount)

 function (cotire_get_configuration_types _configsVar)
-	set (_configs "")
-	if (CMAKE_CONFIGURATION_TYPES)
-		list (APPEND _configs ${CMAKE_CONFIGURATION_TYPES})
-	endif()
-	if (CMAKE_BUILD_TYPE)
-		list (APPEND _configs "${CMAKE_BUILD_TYPE}")
-	endif()
-	if (_configs)
-		list (REMOVE_DUPLICATES _configs)
-		set (${_configsVar} ${_configs} PARENT_SCOPE)
-	else()
-		set (${_configsVar} "None" PARENT_SCOPE)
-	endif()
+    set (_configs "")
+    if (CMAKE_CONFIGURATION_TYPES)
+        list (APPEND _configs ${CMAKE_CONFIGURATION_TYPES})
+    endif()
+    if (CMAKE_BUILD_TYPE)
+        list (APPEND _configs "${CMAKE_BUILD_TYPE}")
+    endif()
+    if (_configs)
+        list (REMOVE_DUPLICATES _configs)
+        set (${_configsVar} ${_configs} PARENT_SCOPE)
+    else()
+        set (${_configsVar} "None" PARENT_SCOPE)
+    endif()
 endfunction()

 function (cotire_get_source_file_extension _sourceFile _extVar)
-	# get_filename_component returns extension from first occurrence of . in file name
-	# this function computes the extension from last occurrence of . in file name
-	string (FIND "${_sourceFile}" "." _index REVERSE)
-	if (_index GREATER -1)
-		math (EXPR _index "${_index} + 1")
-		string (SUBSTRING "${_sourceFile}" ${_index} -1 _sourceExt)
-	else()
-		set (_sourceExt "")
-	endif()
-	set (${_extVar} "${_sourceExt}" PARENT_SCOPE)
+    # get_filename_component returns extension from first occurrence of . in file name
+    # this function computes the extension from last occurrence of . in file name
+    string (FIND "${_sourceFile}" "." _index REVERSE)
+    if (_index GREATER -1)
+        math (EXPR _index "${_index} + 1")
+        string (SUBSTRING "${_sourceFile}" ${_index} -1 _sourceExt)
+    else()
+        set (_sourceExt "")
+    endif()
+    set (${_extVar} "${_sourceExt}" PARENT_SCOPE)
 endfunction()

 macro (cotire_check_is_path_relative_to _path _isRelativeVar)
-	set (${_isRelativeVar} FALSE)
-	if (IS_ABSOLUTE "${_path}")
-		foreach (_dir ${ARGN})
-			file (RELATIVE_PATH _relPath "${_dir}" "${_path}")
-			if (NOT _relPath OR (NOT IS_ABSOLUTE "${_relPath}" AND NOT "${_relPath}" MATCHES "^\\.\\."))
-				set (${_isRelativeVar} TRUE)
-				break()
-			endif()
-		endforeach()
-	endif()
+    set (${_isRelativeVar} FALSE)
+    if (IS_ABSOLUTE "${_path}")
+        foreach (_dir ${ARGN})
+            file (RELATIVE_PATH _relPath "${_dir}" "${_path}")
+            if (NOT _relPath OR (NOT IS_ABSOLUTE "${_relPath}" AND NOT "${_relPath}" MATCHES "^\\.\\."))
+                set (${_isRelativeVar} TRUE)
+                break()
+            endif()
+        endforeach()
+    endif()
 endmacro()

 function (cotire_filter_language_source_files _language _target _sourceFilesVar _excludedSourceFilesVar _cotiredSourceFilesVar)
-	if (CMAKE_${_language}_SOURCE_FILE_EXTENSIONS)
-		set (_languageExtensions "${CMAKE_${_language}_SOURCE_FILE_EXTENSIONS}")
-	else()
-		set (_languageExtensions "")
-	endif()
-	if (CMAKE_${_language}_IGNORE_EXTENSIONS)
-		set (_ignoreExtensions "${CMAKE_${_language}_IGNORE_EXTENSIONS}")
-	else()
-		set (_ignoreExtensions "")
-	endif()
-	if (COTIRE_UNITY_SOURCE_EXCLUDE_EXTENSIONS)
-		set (_excludeExtensions "${COTIRE_UNITY_SOURCE_EXCLUDE_EXTENSIONS}")
-	else()
-		set (_excludeExtensions "")
-	endif()
-	if (COTIRE_DEBUG AND _languageExtensions)
-		message (STATUS "${_language} source file extensions: ${_languageExtensions}")
-	endif()
-	if (COTIRE_DEBUG AND _ignoreExtensions)
-		message (STATUS "${_language} ignore extensions: ${_ignoreExtensions}")
-	endif()
-	if (COTIRE_DEBUG AND _excludeExtensions)
-		message (STATUS "${_language} exclude extensions: ${_excludeExtensions}")
-	endif()
-	if (CMAKE_VERSION VERSION_LESS "3.1.0")
-		set (_allSourceFiles ${ARGN})
-	else()
-		# as of CMake 3.1 target sources may contain generator expressions
-		# since we cannot obtain required property information about source files added
-		# through generator expressions at configure time, we filter them out
-		string (GENEX_STRIP "${ARGN}" _allSourceFiles)
-	endif()
-	set (_filteredSourceFiles "")
-	set (_excludedSourceFiles "")
-	foreach (_sourceFile ${_allSourceFiles})
-		get_source_file_property(_sourceIsHeaderOnly "${_sourceFile}" HEADER_FILE_ONLY)
-		get_source_file_property(_sourceIsExternal "${_sourceFile}" EXTERNAL_OBJECT)
-		get_source_file_property(_sourceIsSymbolic "${_sourceFile}" SYMBOLIC)
-		if (NOT _sourceIsHeaderOnly AND NOT _sourceIsExternal AND NOT _sourceIsSymbolic)
-			cotire_get_source_file_extension("${_sourceFile}" _sourceExt)
-			if (_sourceExt)
-				list (FIND _ignoreExtensions "${_sourceExt}" _ignoreIndex)
-				if (_ignoreIndex LESS 0)
-					list (FIND _excludeExtensions "${_sourceExt}" _excludeIndex)
-					if (_excludeIndex GREATER -1)
-						list (APPEND _excludedSourceFiles "${_sourceFile}")
-					else()
-						list (FIND _languageExtensions "${_sourceExt}" _sourceIndex)
-						if (_sourceIndex GREATER -1)
-							# consider source file unless it is excluded explicitly
-							get_source_file_property(_sourceIsExcluded "${_sourceFile}" COTIRE_EXCLUDED)
-							if (_sourceIsExcluded)
-								list (APPEND _excludedSourceFiles "${_sourceFile}")
-							else()
-								list (APPEND _filteredSourceFiles "${_sourceFile}")
-							endif()
-						else()
-							get_source_file_property(_sourceLanguage "${_sourceFile}" LANGUAGE)
-							if ("${_sourceLanguage}" STREQUAL "${_language}")
-								# add to excluded sources, if file is not ignored and has correct language without having the correct extension
-								list (APPEND _excludedSourceFiles "${_sourceFile}")
-							endif()
-						endif()
-					endif()
-				endif()
-			endif()
-		endif()
-	endforeach()
-	# separate filtered source files from already cotired ones
-	# the COTIRE_TARGET property of a source file may be set while a target is being processed by cotire
-	set (_sourceFiles "")
-	set (_cotiredSourceFiles "")
-	foreach (_sourceFile ${_filteredSourceFiles})
-		get_source_file_property(_sourceIsCotired "${_sourceFile}" COTIRE_TARGET)
-		if (_sourceIsCotired)
-			list (APPEND _cotiredSourceFiles "${_sourceFile}")
-		else()
-			get_source_file_property(_sourceCompileFlags "${_sourceFile}" COMPILE_FLAGS)
-			if (_sourceCompileFlags)
-				# add to excluded sources, if file has custom compile flags
-				list (APPEND _excludedSourceFiles "${_sourceFile}")
-			else()
-				list (APPEND _sourceFiles "${_sourceFile}")
-			endif()
-		endif()
-	endforeach()
-	if (COTIRE_DEBUG)
-		if (_sourceFiles)
-			message (STATUS "Filtered ${_target} ${_language} sources: ${_sourceFiles}")
-		endif()
-		if (_excludedSourceFiles)
-			message (STATUS "Excluded ${_target} ${_language} sources: ${_excludedSourceFiles}")
-		endif()
-		if (_cotiredSourceFiles)
-			message (STATUS "Cotired ${_target} ${_language} sources: ${_cotiredSourceFiles}")
-		endif()
-	endif()
-	set (${_sourceFilesVar} ${_sourceFiles} PARENT_SCOPE)
-	set (${_excludedSourceFilesVar} ${_excludedSourceFiles} PARENT_SCOPE)
-	set (${_cotiredSourceFilesVar} ${_cotiredSourceFiles} PARENT_SCOPE)
+    if (CMAKE_${_language}_SOURCE_FILE_EXTENSIONS)
+        set (_languageExtensions "${CMAKE_${_language}_SOURCE_FILE_EXTENSIONS}")
+    else()
+        set (_languageExtensions "")
+    endif()
+    if (CMAKE_${_language}_IGNORE_EXTENSIONS)
+        set (_ignoreExtensions "${CMAKE_${_language}_IGNORE_EXTENSIONS}")
+    else()
+        set (_ignoreExtensions "")
+    endif()
+    if (COTIRE_UNITY_SOURCE_EXCLUDE_EXTENSIONS)
+        set (_excludeExtensions "${COTIRE_UNITY_SOURCE_EXCLUDE_EXTENSIONS}")
+    else()
+        set (_excludeExtensions "")
+    endif()
+    if (COTIRE_DEBUG AND _languageExtensions)
+        message (STATUS "${_language} source file extensions: ${_languageExtensions}")
+    endif()
+    if (COTIRE_DEBUG AND _ignoreExtensions)
+        message (STATUS "${_language} ignore extensions: ${_ignoreExtensions}")
+    endif()
+    if (COTIRE_DEBUG AND _excludeExtensions)
+        message (STATUS "${_language} exclude extensions: ${_excludeExtensions}")
+    endif()
+    if (CMAKE_VERSION VERSION_LESS "3.1.0")
+        set (_allSourceFiles ${ARGN})
+    else()
+        # as of CMake 3.1 target sources may contain generator expressions
+        # since we cannot obtain required property information about source files added
+        # through generator expressions at configure time, we filter them out
+        string (GENEX_STRIP "${ARGN}" _allSourceFiles)
+    endif()
+    set (_filteredSourceFiles "")
+    set (_excludedSourceFiles "")
+    foreach (_sourceFile ${_allSourceFiles})
+        get_source_file_property(_sourceIsHeaderOnly "${_sourceFile}" HEADER_FILE_ONLY)
+        get_source_file_property(_sourceIsExternal "${_sourceFile}" EXTERNAL_OBJECT)
+        get_source_file_property(_sourceIsSymbolic "${_sourceFile}" SYMBOLIC)
+        if (NOT _sourceIsHeaderOnly AND NOT _sourceIsExternal AND NOT _sourceIsSymbolic)
+            cotire_get_source_file_extension("${_sourceFile}" _sourceExt)
+            if (_sourceExt)
+                list (FIND _ignoreExtensions "${_sourceExt}" _ignoreIndex)
+                if (_ignoreIndex LESS 0)
+                    list (FIND _excludeExtensions "${_sourceExt}" _excludeIndex)
+                    if (_excludeIndex GREATER -1)
+                        list (APPEND _excludedSourceFiles "${_sourceFile}")
+                    else()
+                        list (FIND _languageExtensions "${_sourceExt}" _sourceIndex)
+                        if (_sourceIndex GREATER -1)
+                            # consider source file unless it is excluded explicitly
+                            get_source_file_property(_sourceIsExcluded "${_sourceFile}" COTIRE_EXCLUDED)
+                            if (_sourceIsExcluded)
+                                list (APPEND _excludedSourceFiles "${_sourceFile}")
+                            else()
+                                list (APPEND _filteredSourceFiles "${_sourceFile}")
+                            endif()
+                        else()
+                            get_source_file_property(_sourceLanguage "${_sourceFile}" LANGUAGE)
+                            if ("${_sourceLanguage}" STREQUAL "${_language}")
+                                # add to excluded sources, if file is not ignored and has correct language without having the correct extension
+                                list (APPEND _excludedSourceFiles "${_sourceFile}")
+                            endif()
+                        endif()
+                    endif()
+                endif()
+            endif()
+        endif()
+    endforeach()
+    # separate filtered source files from already cotired ones
+    # the COTIRE_TARGET property of a source file may be set while a target is being processed by cotire
+    set (_sourceFiles "")
+    set (_cotiredSourceFiles "")
+    foreach (_sourceFile ${_filteredSourceFiles})
+        get_source_file_property(_sourceIsCotired "${_sourceFile}" COTIRE_TARGET)
+        if (_sourceIsCotired)
+            list (APPEND _cotiredSourceFiles "${_sourceFile}")
+        else()
+            get_source_file_property(_sourceCompileFlags "${_sourceFile}" COMPILE_FLAGS)
+            if (_sourceCompileFlags)
+                # add to excluded sources, if file has custom compile flags
+                list (APPEND _excludedSourceFiles "${_sourceFile}")
+            else()
+                list (APPEND _sourceFiles "${_sourceFile}")
+            endif()
+        endif()
+    endforeach()
+    if (COTIRE_DEBUG)
+        if (_sourceFiles)
+            message (STATUS "Filtered ${_target} ${_language} sources: ${_sourceFiles}")
+        endif()
+        if (_excludedSourceFiles)
+            message (STATUS "Excluded ${_target} ${_language} sources: ${_excludedSourceFiles}")
+        endif()
+        if (_cotiredSourceFiles)
+            message (STATUS "Cotired ${_target} ${_language} sources: ${_cotiredSourceFiles}")
+        endif()
+    endif()
+    set (${_sourceFilesVar} ${_sourceFiles} PARENT_SCOPE)
+    set (${_excludedSourceFilesVar} ${_excludedSourceFiles} PARENT_SCOPE)
+    set (${_cotiredSourceFilesVar} ${_cotiredSourceFiles} PARENT_SCOPE)
 endfunction()

 function (cotire_get_objects_with_property_on _filteredObjectsVar _property _type)
-	set (_filteredObjects "")
-	foreach (_object ${ARGN})
-		get_property(_isSet ${_type} "${_object}" PROPERTY ${_property} SET)
-		if (_isSet)
-			get_property(_propertyValue ${_type} "${_object}" PROPERTY ${_property})
-			if (_propertyValue)
-				list (APPEND _filteredObjects "${_object}")
-			endif()
-		endif()
-	endforeach()
-	set (${_filteredObjectsVar} ${_filteredObjects} PARENT_SCOPE)
+    set (_filteredObjects "")
+    foreach (_object ${ARGN})
+        get_property(_isSet ${_type} "${_object}" PROPERTY ${_property} SET)
+        if (_isSet)
+            get_property(_propertyValue ${_type} "${_object}" PROPERTY ${_property})
+            if (_propertyValue)
+                list (APPEND _filteredObjects "${_object}")
+            endif()
+        endif()
+    endforeach()
+    set (${_filteredObjectsVar} ${_filteredObjects} PARENT_SCOPE)
 endfunction()

 function (cotire_get_objects_with_property_off _filteredObjectsVar _property _type)
-	set (_filteredObjects "")
-	foreach (_object ${ARGN})
-		get_property(_isSet ${_type} "${_object}" PROPERTY ${_property} SET)
-		if (_isSet)
-			get_property(_propertyValue ${_type} "${_object}" PROPERTY ${_property})
-			if (NOT _propertyValue)
-				list (APPEND _filteredObjects "${_object}")
-			endif()
-		endif()
-	endforeach()
-	set (${_filteredObjectsVar} ${_filteredObjects} PARENT_SCOPE)
+    set (_filteredObjects "")
+    foreach (_object ${ARGN})
+        get_property(_isSet ${_type} "${_object}" PROPERTY ${_property} SET)
+        if (_isSet)
+            get_property(_propertyValue ${_type} "${_object}" PROPERTY ${_property})
+            if (NOT _propertyValue)
+                list (APPEND _filteredObjects "${_object}")
+            endif()
+        endif()
+    endforeach()
+    set (${_filteredObjectsVar} ${_filteredObjects} PARENT_SCOPE)
 endfunction()

 function (cotire_get_source_file_property_values _valuesVar _property)
-	set (_values "")
-	foreach (_sourceFile ${ARGN})
-		get_source_file_property(_propertyValue "${_sourceFile}" ${_property})
-		if (_propertyValue)
-			list (APPEND _values "${_propertyValue}")
-		endif()
-	endforeach()
-	set (${_valuesVar} ${_values} PARENT_SCOPE)
+    set (_values "")
+    foreach (_sourceFile ${ARGN})
+        get_source_file_property(_propertyValue "${_sourceFile}" ${_property})
+        if (_propertyValue)
+            list (APPEND _values "${_propertyValue}")
+        endif()
+    endforeach()
+    set (${_valuesVar} ${_values} PARENT_SCOPE)
 endfunction()

 function (cotire_resolve_config_properites _configurations _propertiesVar)
-	set (_properties "")
-	foreach (_property ${ARGN})
-		if ("${_property}" MATCHES "<CONFIG>")
-			foreach (_config ${_configurations})
-				string (TOUPPER "${_config}" _upperConfig)
-				string (REPLACE "<CONFIG>" "${_upperConfig}" _configProperty "${_property}")
-				list (APPEND _properties ${_configProperty})
-			endforeach()
-		else()
-			list (APPEND _properties ${_property})
-		endif()
-	endforeach()
-	set (${_propertiesVar} ${_properties} PARENT_SCOPE)
+    set (_properties "")
+    foreach (_property ${ARGN})
+        if ("${_property}" MATCHES "<CONFIG>")
+            foreach (_config ${_configurations})
+                string (TOUPPER "${_config}" _upperConfig)
+                string (REPLACE "<CONFIG>" "${_upperConfig}" _configProperty "${_property}")
+                list (APPEND _properties ${_configProperty})
+            endforeach()
+        else()
+            list (APPEND _properties ${_property})
+        endif()
+    endforeach()
+    set (${_propertiesVar} ${_properties} PARENT_SCOPE)
 endfunction()

 function (cotire_copy_set_properites _configurations _type _source _target)
-	cotire_resolve_config_properites("${_configurations}" _properties ${ARGN})
-	foreach (_property ${_properties})
-		get_property(_isSet ${_type} ${_source} PROPERTY ${_property} SET)
-		if (_isSet)
-			get_property(_propertyValue ${_type} ${_source} PROPERTY ${_property})
-			set_property(${_type} ${_target} PROPERTY ${_property} "${_propertyValue}")
-		endif()
-	endforeach()
+    cotire_resolve_config_properites("${_configurations}" _properties ${ARGN})
+    foreach (_property ${_properties})
+        get_property(_isSet ${_type} ${_source} PROPERTY ${_property} SET)
+        if (_isSet)
+            get_property(_propertyValue ${_type} ${_source} PROPERTY ${_property})
+            set_property(${_type} ${_target} PROPERTY ${_property} "${_propertyValue}")
+        endif()
+    endforeach()
 endfunction()

 function (cotire_get_target_usage_requirements _target _targetRequirementsVar)
-	set (_targetRequirements "")
-	get_target_property(_librariesToProcess ${_target} LINK_LIBRARIES)
-	while (_librariesToProcess)
-		# remove from head
-		list (GET _librariesToProcess 0 _library)
-		list (REMOVE_AT _librariesToProcess 0)
-		if (TARGET ${_library})
-			list (FIND _targetRequirements ${_library} _index)
-			if (_index LESS 0)
-				list (APPEND _targetRequirements ${_library})
-				# process transitive libraries
-				get_target_property(_libraries ${_library} INTERFACE_LINK_LIBRARIES)
-				if (_libraries)
-					list (APPEND _librariesToProcess ${_libraries})
-					list (REMOVE_DUPLICATES _librariesToProcess)
-				endif()
-			endif()
-		endif()
-	endwhile()
-	set (${_targetRequirementsVar} ${_targetRequirements} PARENT_SCOPE)
+    set (_targetRequirements "")
+    get_target_property(_librariesToProcess ${_target} LINK_LIBRARIES)
+    while (_librariesToProcess)
+        # remove from head
+        list (GET _librariesToProcess 0 _library)
+        list (REMOVE_AT _librariesToProcess 0)
+        if (TARGET ${_library})
+            list (FIND _targetRequirements ${_library} _index)
+            if (_index LESS 0)
+                list (APPEND _targetRequirements ${_library})
+                # process transitive libraries
+                get_target_property(_libraries ${_library} INTERFACE_LINK_LIBRARIES)
+                if (_libraries)
+                    list (APPEND _librariesToProcess ${_libraries})
+                    list (REMOVE_DUPLICATES _librariesToProcess)
+                endif()
+            endif()
+        endif()
+    endwhile()
+    set (${_targetRequirementsVar} ${_targetRequirements} PARENT_SCOPE)
 endfunction()

 function (cotire_filter_compile_flags _language _flagFilter _matchedOptionsVar _unmatchedOptionsVar)
-	if (WIN32 AND CMAKE_${_language}_COMPILER_ID MATCHES "MSVC|Intel")
-		set (_flagPrefix "[/-]")
-	else()
-		set (_flagPrefix "--?")
-	endif()
-	set (_optionFlag "")
-	set (_matchedOptions "")
-	set (_unmatchedOptions "")
-	foreach (_compileFlag ${ARGN})
-		if (_compileFlag)
-			if (_optionFlag AND NOT "${_compileFlag}" MATCHES "^${_flagPrefix}")
-				# option with separate argument
-				list (APPEND _matchedOptions "${_compileFlag}")
-				set (_optionFlag "")
-			elseif ("${_compileFlag}" MATCHES "^(${_flagPrefix})(${_flagFilter})$")
-				# remember option
-				set (_optionFlag "${CMAKE_MATCH_2}")
-			elseif ("${_compileFlag}" MATCHES "^(${_flagPrefix})(${_flagFilter})(.+)$")
-				# option with joined argument
-				list (APPEND _matchedOptions "${CMAKE_MATCH_3}")
-				set (_optionFlag "")
-			else()
-				# flush remembered option
-				if (_optionFlag)
-					list (APPEND _matchedOptions "${_optionFlag}")
-					set (_optionFlag "")
-				endif()
-				# add to unfiltered options
-				list (APPEND _unmatchedOptions "${_compileFlag}")
-			endif()
-		endif()
-	endforeach()
-	if (_optionFlag)
-		list (APPEND _matchedOptions "${_optionFlag}")
-	endif()
-	if (COTIRE_DEBUG AND _matchedOptions)
-		message (STATUS "Filter ${_flagFilter} matched: ${_matchedOptions}")
-	endif()
-	if (COTIRE_DEBUG AND _unmatchedOptions)
-		message (STATUS "Filter ${_flagFilter} unmatched: ${_unmatchedOptions}")
-	endif()
-	set (${_matchedOptionsVar} ${_matchedOptions} PARENT_SCOPE)
-	set (${_unmatchedOptionsVar} ${_unmatchedOptions} PARENT_SCOPE)
+    if (WIN32 AND CMAKE_${_language}_COMPILER_ID MATCHES "MSVC|Intel")
+        set (_flagPrefix "[/-]")
+    else()
+        set (_flagPrefix "--?")
+    endif()
+    set (_optionFlag "")
+    set (_matchedOptions "")
+    set (_unmatchedOptions "")
+    foreach (_compileFlag ${ARGN})
+        if (_compileFlag)
+            if (_optionFlag AND NOT "${_compileFlag}" MATCHES "^${_flagPrefix}")
+                # option with separate argument
+                list (APPEND _matchedOptions "${_compileFlag}")
+                set (_optionFlag "")
+            elseif ("${_compileFlag}" MATCHES "^(${_flagPrefix})(${_flagFilter})$")
+                # remember option
+                set (_optionFlag "${CMAKE_MATCH_2}")
+            elseif ("${_compileFlag}" MATCHES "^(${_flagPrefix})(${_flagFilter})(.+)$")
+                # option with joined argument
+                list (APPEND _matchedOptions "${CMAKE_MATCH_3}")
+                set (_optionFlag "")
+            else()
+                # flush remembered option
+                if (_optionFlag)
+                    list (APPEND _matchedOptions "${_optionFlag}")
+                    set (_optionFlag "")
+                endif()
+                # add to unfiltered options
+                list (APPEND _unmatchedOptions "${_compileFlag}")
+            endif()
+        endif()
+    endforeach()
+    if (_optionFlag)
+        list (APPEND _matchedOptions "${_optionFlag}")
+    endif()
+    if (COTIRE_DEBUG AND _matchedOptions)
+        message (STATUS "Filter ${_flagFilter} matched: ${_matchedOptions}")
+    endif()
+    if (COTIRE_DEBUG AND _unmatchedOptions)
+        message (STATUS "Filter ${_flagFilter} unmatched: ${_unmatchedOptions}")
+    endif()
+    set (${_matchedOptionsVar} ${_matchedOptions} PARENT_SCOPE)
+    set (${_unmatchedOptionsVar} ${_unmatchedOptions} PARENT_SCOPE)
 endfunction()

 function (cotire_get_target_compile_flags _config _language _target _flagsVar)
-	string (TOUPPER "${_config}" _upperConfig)
-	# collect options from CMake language variables
-	set (_compileFlags "")
-	if (CMAKE_${_language}_FLAGS)
-		set (_compileFlags "${_compileFlags} ${CMAKE_${_language}_FLAGS}")
-	endif()
-	if (CMAKE_${_language}_FLAGS_${_upperConfig})
-		set (_compileFlags "${_compileFlags} ${CMAKE_${_language}_FLAGS_${_upperConfig}}")
-	endif()
-	if (_target)
-		# add target compile flags
-		get_target_property(_targetflags ${_target} COMPILE_FLAGS)
-		if (_targetflags)
-			set (_compileFlags "${_compileFlags} ${_targetflags}")
-		endif()
-	endif()
-	if (UNIX)
-		separate_arguments(_compileFlags UNIX_COMMAND "${_compileFlags}")
-	elseif(WIN32)
-		separate_arguments(_compileFlags WINDOWS_COMMAND "${_compileFlags}")
-	else()
-		separate_arguments(_compileFlags)
-	endif()
-	# target compile options
-	if (_target)
-		get_target_property(_targetOptions ${_target} COMPILE_OPTIONS)
-		if (_targetOptions)
-			list (APPEND _compileFlags ${_targetOptions})
-		endif()
-	endif()
-	# interface compile options from linked library targets
-	if (_target)
-		set (_linkedTargets "")
-		cotire_get_target_usage_requirements(${_target} _linkedTargets)
-		foreach (_linkedTarget ${_linkedTargets})
-			get_target_property(_targetOptions ${_linkedTarget} INTERFACE_COMPILE_OPTIONS)
-			if (_targetOptions)
-				list (APPEND _compileFlags ${_targetOptions})
-			endif()
-		endforeach()
-	endif()
-	# handle language standard properties
-	if (_target)
-		get_target_property(_targetLanguageStandard ${_target} ${_language}_STANDARD)
-		get_target_property(_targetLanguageExtensions ${_target} ${_language}_EXTENSIONS)
-		get_target_property(_targetLanguageStandardRequired ${_target} ${_language}_STANDARD_REQUIRED)
-		if (_targetLanguageExtensions)
-			if (CMAKE_${_language}${_targetLanguageExtensions}_EXTENSION_COMPILE_OPTION)
-				list (APPEND _compileFlags "${CMAKE_${_language}${_targetLanguageExtensions}_EXTENSION_COMPILE_OPTION}")
-			endif()
-		elseif (_targetLanguageStandard)
-			if (_targetLanguageStandardRequired)
-				if (CMAKE_${_language}${_targetLanguageStandard}_STANDARD_COMPILE_OPTION)
-					list (APPEND _compileFlags "${CMAKE_${_language}${_targetLanguageStandard}_STANDARD_COMPILE_OPTION}")
-				endif()
-			else()
-				if (CMAKE_${_language}${_targetLanguageStandard}_EXTENSION_COMPILE_OPTION)
-					list (APPEND _compileFlags "${CMAKE_${_language}${_targetLanguageStandard}_EXTENSION_COMPILE_OPTION}")
-				endif()
-			endif()
-		endif()
-	endif()
-	# handle the POSITION_INDEPENDENT_CODE target property
-	if (_target)
-		get_target_property(_targetPIC ${_target} POSITION_INDEPENDENT_CODE)
-		if (_targetPIC)
-			get_target_property(_targetType ${_target} TYPE)
-			if (_targetType STREQUAL "EXECUTABLE" AND CMAKE_${_language}_COMPILE_OPTIONS_PIE)
-				list (APPEND _compileFlags "${CMAKE_${_language}_COMPILE_OPTIONS_PIE}")
-			elseif (CMAKE_${_language}_COMPILE_OPTIONS_PIC)
-				list (APPEND _compileFlags "${CMAKE_${_language}_COMPILE_OPTIONS_PIC}")
-			endif()
-		endif()
-	endif()
-	# platform specific flags
-	if (APPLE)
-		get_target_property(_architectures ${_target} OSX_ARCHITECTURES_${_upperConfig})
-		if (NOT _architectures)
-			get_target_property(_architectures ${_target} OSX_ARCHITECTURES)
-		endif()
-		if (_architectures)
-			foreach (_arch ${_architectures})
-				list (APPEND _compileFlags "-arch" "${_arch}")
-			endforeach()
-		endif()
-		if (CMAKE_OSX_SYSROOT)
-			if (CMAKE_${_language}_SYSROOT_FLAG)
-				list (APPEND _compileFlags "${CMAKE_${_language}_SYSROOT_FLAG}" "${CMAKE_OSX_SYSROOT}")
-			else()
-				list (APPEND _compileFlags "-isysroot" "${CMAKE_OSX_SYSROOT}")
-			endif()
-		endif()
-		if (CMAKE_OSX_DEPLOYMENT_TARGET)
-			if (CMAKE_${_language}_OSX_DEPLOYMENT_TARGET_FLAG)
-				list (APPEND _compileFlags "${CMAKE_${_language}_OSX_DEPLOYMENT_TARGET_FLAG}${CMAKE_OSX_DEPLOYMENT_TARGET}")
-			else()
-				list (APPEND _compileFlags "-mmacosx-version-min=${CMAKE_OSX_DEPLOYMENT_TARGET}")
-			endif()
-		endif()
-	endif()
-	if (COTIRE_DEBUG AND _compileFlags)
-		message (STATUS "Target ${_target} compile flags: ${_compileFlags}")
-	endif()
-	set (${_flagsVar} ${_compileFlags} PARENT_SCOPE)
+    string (TOUPPER "${_config}" _upperConfig)
+    # collect options from CMake language variables
+    set (_compileFlags "")
+    if (CMAKE_${_language}_FLAGS)
+        set (_compileFlags "${_compileFlags} ${CMAKE_${_language}_FLAGS}")
+    endif()
+    if (CMAKE_${_language}_FLAGS_${_upperConfig})
+        set (_compileFlags "${_compileFlags} ${CMAKE_${_language}_FLAGS_${_upperConfig}}")
+    endif()
+    if (_target)
+        # add target compile flags
+        get_target_property(_targetflags ${_target} COMPILE_FLAGS)
+        if (_targetflags)
+            set (_compileFlags "${_compileFlags} ${_targetflags}")
+        endif()
+    endif()
+    if (UNIX)
+        separate_arguments(_compileFlags UNIX_COMMAND "${_compileFlags}")
+    elseif(WIN32)
+        separate_arguments(_compileFlags WINDOWS_COMMAND "${_compileFlags}")
+    else()
+        separate_arguments(_compileFlags)
+    endif()
+    # target compile options
+    if (_target)
+        get_target_property(_targetOptions ${_target} COMPILE_OPTIONS)
+        if (_targetOptions)
+            list (APPEND _compileFlags ${_targetOptions})
+        endif()
+    endif()
+    # interface compile options from linked library targets
+    if (_target)
+        set (_linkedTargets "")
+        cotire_get_target_usage_requirements(${_target} _linkedTargets)
+        foreach (_linkedTarget ${_linkedTargets})
+            get_target_property(_targetOptions ${_linkedTarget} INTERFACE_COMPILE_OPTIONS)
+            if (_targetOptions)
+                list (APPEND _compileFlags ${_targetOptions})
+            endif()
+        endforeach()
+    endif()
+    # handle language standard properties
+    if (_target)
+        get_target_property(_targetLanguageStandard ${_target} ${_language}_STANDARD)
+        get_target_property(_targetLanguageExtensions ${_target} ${_language}_EXTENSIONS)
+        get_target_property(_targetLanguageStandardRequired ${_target} ${_language}_STANDARD_REQUIRED)
+        if (_targetLanguageExtensions)
+            if (CMAKE_${_language}${_targetLanguageExtensions}_EXTENSION_COMPILE_OPTION)
+                list (APPEND _compileFlags "${CMAKE_${_language}${_targetLanguageExtensions}_EXTENSION_COMPILE_OPTION}")
+            endif()
+        elseif (_targetLanguageStandard)
+            if (_targetLanguageStandardRequired)
+                if (CMAKE_${_language}${_targetLanguageStandard}_STANDARD_COMPILE_OPTION)
+                    list (APPEND _compileFlags "${CMAKE_${_language}${_targetLanguageStandard}_STANDARD_COMPILE_OPTION}")
+                endif()
+            else()
+                if (CMAKE_${_language}${_targetLanguageStandard}_EXTENSION_COMPILE_OPTION)
+                    list (APPEND _compileFlags "${CMAKE_${_language}${_targetLanguageStandard}_EXTENSION_COMPILE_OPTION}")
+                endif()
+            endif()
+        endif()
+    endif()
+    # handle the POSITION_INDEPENDENT_CODE target property
+    if (_target)
+        get_target_property(_targetPIC ${_target} POSITION_INDEPENDENT_CODE)
+        if (_targetPIC)
+            get_target_property(_targetType ${_target} TYPE)
+            if (_targetType STREQUAL "EXECUTABLE" AND CMAKE_${_language}_COMPILE_OPTIONS_PIE)
+                list (APPEND _compileFlags "${CMAKE_${_language}_COMPILE_OPTIONS_PIE}")
+            elseif (CMAKE_${_language}_COMPILE_OPTIONS_PIC)
+                list (APPEND _compileFlags "${CMAKE_${_language}_COMPILE_OPTIONS_PIC}")
+            endif()
+        endif()
+    endif()
+    # handle visibility target properties
+    if (_target)
+        get_target_property(_targetVisibility ${_target} ${_language}_VISIBILITY_PRESET)
+        if (_targetVisibility AND CMAKE_${_language}_COMPILE_OPTIONS_VISIBILITY)
+            list (APPEND _compileFlags "${CMAKE_${_language}_COMPILE_OPTIONS_VISIBILITY}${_targetVisibility}")
+        endif()
+        get_target_property(_targetVisibilityInlines ${_target} VISIBILITY_INLINES_HIDDEN)
+        if (_targetVisibilityInlines AND CMAKE_${_language}_COMPILE_OPTIONS_VISIBILITY_INLINES_HIDDEN)
+            list (APPEND _compileFlags "${CMAKE_${_language}_COMPILE_OPTIONS_VISIBILITY_INLINES_HIDDEN}")
+        endif()
+    endif()
+    # platform specific flags
+    if (APPLE)
+        get_target_property(_architectures ${_target} OSX_ARCHITECTURES_${_upperConfig})
+        if (NOT _architectures)
+            get_target_property(_architectures ${_target} OSX_ARCHITECTURES)
+        endif()
+        if (_architectures)
+            foreach (_arch ${_architectures})
+                list (APPEND _compileFlags "-arch" "${_arch}")
+            endforeach()
+        endif()
+        if (CMAKE_OSX_SYSROOT)
+            if (CMAKE_${_language}_SYSROOT_FLAG)
+                list (APPEND _compileFlags "${CMAKE_${_language}_SYSROOT_FLAG}" "${CMAKE_OSX_SYSROOT}")
+            else()
+                list (APPEND _compileFlags "-isysroot" "${CMAKE_OSX_SYSROOT}")
+            endif()
+        endif()
+        if (CMAKE_OSX_DEPLOYMENT_TARGET)
+            if (CMAKE_${_language}_OSX_DEPLOYMENT_TARGET_FLAG)
+                list (APPEND _compileFlags "${CMAKE_${_language}_OSX_DEPLOYMENT_TARGET_FLAG}${CMAKE_OSX_DEPLOYMENT_TARGET}")
+            else()
+                list (APPEND _compileFlags "-mmacosx-version-min=${CMAKE_OSX_DEPLOYMENT_TARGET}")
+            endif()
+        endif()
+    endif()
+    if (COTIRE_DEBUG AND _compileFlags)
+        message (STATUS "Target ${_target} compile flags: ${_compileFlags}")
+    endif()
+    set (${_flagsVar} ${_compileFlags} PARENT_SCOPE)
 endfunction()

 function (cotire_get_target_include_directories _config _language _target _includeDirsVar _systemIncludeDirsVar)
-	set (_includeDirs "")
-	set (_systemIncludeDirs "")
-	# default include dirs
-	if (CMAKE_INCLUDE_CURRENT_DIR)
-		list (APPEND _includeDirs "${CMAKE_CURRENT_BINARY_DIR}")
-		list (APPEND _includeDirs "${CMAKE_CURRENT_SOURCE_DIR}")
-	endif()
-	# parse additional include directories from target compile flags
-	set (_targetFlags "")
-	cotire_get_target_compile_flags("${_config}" "${_language}" "${_target}" _targetFlags)
-	cotire_filter_compile_flags("${_language}" "I" _dirs _ignore ${_targetFlags})
-	if (_dirs)
-		list (APPEND _includeDirs ${_dirs})
-	endif()
-	# target include directories
-	get_directory_property(_dirs DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}" INCLUDE_DIRECTORIES)
-	if (_target)
-		get_target_property(_targetDirs ${_target} INCLUDE_DIRECTORIES)
-		if (_targetDirs)
-			list (APPEND _dirs ${_targetDirs})
-		endif()
-		get_target_property(_targetDirs ${_target} INTERFACE_SYSTEM_INCLUDE_DIRECTORIES)
-		if (_targetDirs)
-			list (APPEND _systemIncludeDirs ${_targetDirs})
-		endif()
-	endif()
-	# interface include directories from linked library targets
-	if (_target)
-		set (_linkedTargets "")
-		cotire_get_target_usage_requirements(${_target} _linkedTargets)
-		foreach (_linkedTarget ${_linkedTargets})
-			get_target_property(_targetDirs ${_linkedTarget} INTERFACE_INCLUDE_DIRECTORIES)
-			if (_targetDirs)
-				list (APPEND _dirs ${_targetDirs})
-			endif()
-			get_target_property(_targetDirs ${_linkedTarget} INTERFACE_SYSTEM_INCLUDE_DIRECTORIES)
-			if (_targetDirs)
-				list (APPEND _systemIncludeDirs ${_targetDirs})
-			endif()
-		endforeach()
-	endif()
-	if (dirs)
-		list (REMOVE_DUPLICATES _dirs)
-	endif()
-	list (LENGTH _includeDirs _projectInsertIndex)
-	foreach (_dir ${_dirs})
-		if (CMAKE_INCLUDE_DIRECTORIES_PROJECT_BEFORE)
-			cotire_check_is_path_relative_to("${_dir}" _isRelative "${CMAKE_SOURCE_DIR}" "${CMAKE_BINARY_DIR}")
-			if (_isRelative)
-				list (LENGTH _includeDirs _len)
-				if (_len EQUAL _projectInsertIndex)
-					list (APPEND _includeDirs "${_dir}")
-				else()
-					list (INSERT _includeDirs _projectInsertIndex "${_dir}")
-				endif()
-				math (EXPR _projectInsertIndex "${_projectInsertIndex} + 1")
-			else()
-				list (APPEND _includeDirs "${_dir}")
-			endif()
-		else()
-			list (APPEND _includeDirs "${_dir}")
-		endif()
-	endforeach()
-	list (REMOVE_DUPLICATES _includeDirs)
-	list (REMOVE_DUPLICATES _systemIncludeDirs)
-	if (CMAKE_${_language}_IMPLICIT_INCLUDE_DIRECTORIES)
-		list (REMOVE_ITEM _includeDirs ${CMAKE_${_language}_IMPLICIT_INCLUDE_DIRECTORIES})
-	endif()
-	if (COTIRE_DEBUG AND _includeDirs)
-		message (STATUS "Target ${_target} include dirs: ${_includeDirs}")
-	endif()
-	set (${_includeDirsVar} ${_includeDirs} PARENT_SCOPE)
-	if (COTIRE_DEBUG AND _systemIncludeDirs)
-		message (STATUS "Target ${_target} system include dirs: ${_systemIncludeDirs}")
-	endif()
-	set (${_systemIncludeDirsVar} ${_systemIncludeDirs} PARENT_SCOPE)
+    set (_includeDirs "")
+    set (_systemIncludeDirs "")
+    # default include dirs
+    if (CMAKE_INCLUDE_CURRENT_DIR)
+        list (APPEND _includeDirs "${CMAKE_CURRENT_BINARY_DIR}")
+        list (APPEND _includeDirs "${CMAKE_CURRENT_SOURCE_DIR}")
+    endif()
+    set (_targetFlags "")
+    cotire_get_target_compile_flags("${_config}" "${_language}" "${_target}" _targetFlags)
+    # parse additional include directories from target compile flags
+    if (CMAKE_INCLUDE_FLAG_${_language})
+        string (STRIP "${CMAKE_INCLUDE_FLAG_${_language}}" _includeFlag)
+        string (REGEX REPLACE "^[-/]+" "" _includeFlag "${_includeFlag}")
+        if (_includeFlag)
+            set (_dirs "")
+            cotire_filter_compile_flags("${_language}" "${_includeFlag}" _dirs _ignore ${_targetFlags})
+            if (_dirs)
+                list (APPEND _includeDirs ${_dirs})
+            endif()
+        endif()
+    endif()
+    # parse additional system include directories from target compile flags
+    if (CMAKE_INCLUDE_SYSTEM_FLAG_${_language})
+        string (STRIP "${CMAKE_INCLUDE_SYSTEM_FLAG_${_language}}" _includeFlag)
+        string (REGEX REPLACE "^[-/]+" "" _includeFlag "${_includeFlag}")
+        if (_includeFlag)
+            set (_dirs "")
+            cotire_filter_compile_flags("${_language}" "${_includeFlag}" _dirs _ignore ${_targetFlags})
+            if (_dirs)
+                list (APPEND _systemIncludeDirs ${_dirs})
+            endif()
+        endif()
+    endif()
+    # target include directories
+    get_directory_property(_dirs DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}" INCLUDE_DIRECTORIES)
+    if (_target)
+        get_target_property(_targetDirs ${_target} INCLUDE_DIRECTORIES)
+        if (_targetDirs)
+            list (APPEND _dirs ${_targetDirs})
+        endif()
+        get_target_property(_targetDirs ${_target} INTERFACE_SYSTEM_INCLUDE_DIRECTORIES)
+        if (_targetDirs)
+            list (APPEND _systemIncludeDirs ${_targetDirs})
+        endif()
+    endif()
+    # interface include directories from linked library targets
+    if (_target)
+        set (_linkedTargets "")
+        cotire_get_target_usage_requirements(${_target} _linkedTargets)
+        foreach (_linkedTarget ${_linkedTargets})
+            get_target_property(_targetDirs ${_linkedTarget} INTERFACE_INCLUDE_DIRECTORIES)
+            if (_targetDirs)
+                list (APPEND _dirs ${_targetDirs})
+            endif()
+            get_target_property(_targetDirs ${_linkedTarget} INTERFACE_SYSTEM_INCLUDE_DIRECTORIES)
+            if (_targetDirs)
+                list (APPEND _systemIncludeDirs ${_targetDirs})
+            endif()
+        endforeach()
+    endif()
+    if (dirs)
+        list (REMOVE_DUPLICATES _dirs)
+    endif()
+    list (LENGTH _includeDirs _projectInsertIndex)
+    foreach (_dir ${_dirs})
+        if (CMAKE_INCLUDE_DIRECTORIES_PROJECT_BEFORE)
+            cotire_check_is_path_relative_to("${_dir}" _isRelative "${CMAKE_SOURCE_DIR}" "${CMAKE_BINARY_DIR}")
+            if (_isRelative)
+                list (LENGTH _includeDirs _len)
+                if (_len EQUAL _projectInsertIndex)
+                    list (APPEND _includeDirs "${_dir}")
+                else()
+                    list (INSERT _includeDirs _projectInsertIndex "${_dir}")
+                endif()
+                math (EXPR _projectInsertIndex "${_projectInsertIndex} + 1")
+            else()
+                list (APPEND _includeDirs "${_dir}")
+            endif()
+        else()
+            list (APPEND _includeDirs "${_dir}")
+        endif()
+    endforeach()
+    list (REMOVE_DUPLICATES _includeDirs)
+    list (REMOVE_DUPLICATES _systemIncludeDirs)
+    if (CMAKE_${_language}_IMPLICIT_INCLUDE_DIRECTORIES)
+        list (REMOVE_ITEM _includeDirs ${CMAKE_${_language}_IMPLICIT_INCLUDE_DIRECTORIES})
+    endif()
+    if (COTIRE_DEBUG AND _includeDirs)
+        message (STATUS "Target ${_target} include dirs: ${_includeDirs}")
+    endif()
+    set (${_includeDirsVar} ${_includeDirs} PARENT_SCOPE)
+    if (COTIRE_DEBUG AND _systemIncludeDirs)
+        message (STATUS "Target ${_target} system include dirs: ${_systemIncludeDirs}")
+    endif()
+    set (${_systemIncludeDirsVar} ${_systemIncludeDirs} PARENT_SCOPE)
 endfunction()

 function (cotire_get_target_export_symbol _target _exportSymbolVar)
-	set (_exportSymbol "")
-	get_target_property(_targetType ${_target} TYPE)
-	get_target_property(_enableExports ${_target} ENABLE_EXPORTS)
-	if (_targetType MATCHES "(SHARED|MODULE)_LIBRARY" OR
-		(_targetType STREQUAL "EXECUTABLE" AND _enableExports))
-		get_target_property(_exportSymbol ${_target} DEFINE_SYMBOL)
-		if (NOT _exportSymbol)
-			set (_exportSymbol "${_target}_EXPORTS")
-		endif()
-		string (MAKE_C_IDENTIFIER "${_exportSymbol}" _exportSymbol)
-	endif()
-	set (${_exportSymbolVar} ${_exportSymbol} PARENT_SCOPE)
+    set (_exportSymbol "")
+    get_target_property(_targetType ${_target} TYPE)
+    get_target_property(_enableExports ${_target} ENABLE_EXPORTS)
+    if (_targetType MATCHES "(SHARED|MODULE)_LIBRARY" OR
+        (_targetType STREQUAL "EXECUTABLE" AND _enableExports))
+        get_target_property(_exportSymbol ${_target} DEFINE_SYMBOL)
+        if (NOT _exportSymbol)
+            set (_exportSymbol "${_target}_EXPORTS")
+        endif()
+        string (MAKE_C_IDENTIFIER "${_exportSymbol}" _exportSymbol)
+    endif()
+    set (${_exportSymbolVar} ${_exportSymbol} PARENT_SCOPE)
 endfunction()

 function (cotire_get_target_compile_definitions _config _language _target _definitionsVar)
-	string (TOUPPER "${_config}" _upperConfig)
-	set (_configDefinitions "")
-	# CMAKE_INTDIR for multi-configuration build systems
-	if (NOT "${CMAKE_CFG_INTDIR}" STREQUAL ".")
-		list (APPEND _configDefinitions "CMAKE_INTDIR=\"${_config}\"")
-	endif()
-	# target export define symbol
-	cotire_get_target_export_symbol("${_target}" _defineSymbol)
-	if (_defineSymbol)
-		list (APPEND _configDefinitions "${_defineSymbol}")
-	endif()
-	# directory compile definitions
-	get_directory_property(_definitions DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}" COMPILE_DEFINITIONS)
-	if (_definitions)
-		list (APPEND _configDefinitions ${_definitions})
-	endif()
-	get_directory_property(_definitions DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}" COMPILE_DEFINITIONS_${_upperConfig})
-	if (_definitions)
-		list (APPEND _configDefinitions ${_definitions})
-	endif()
-	# target compile definitions
-	get_target_property(_definitions ${_target} COMPILE_DEFINITIONS)
-	if (_definitions)
-		list (APPEND _configDefinitions ${_definitions})
-	endif()
-	get_target_property(_definitions ${_target} COMPILE_DEFINITIONS_${_upperConfig})
-	if (_definitions)
-		list (APPEND _configDefinitions ${_definitions})
-	endif()
-	# interface compile definitions from linked library targets
-	set (_linkedTargets "")
-	cotire_get_target_usage_requirements(${_target} _linkedTargets)
-	foreach (_linkedTarget ${_linkedTargets})
-		get_target_property(_definitions ${_linkedTarget} INTERFACE_COMPILE_DEFINITIONS)
-		if (_definitions)
-			list (APPEND _configDefinitions ${_definitions})
-		endif()
-	endforeach()
-	# parse additional compile definitions from target compile flags
-	# and don't look at directory compile definitions, which we already handled
-	set (_targetFlags "")
-	cotire_get_target_compile_flags("${_config}" "${_language}" "${_target}" _targetFlags)
-	cotire_filter_compile_flags("${_language}" "D" _definitions _ignore ${_targetFlags})
-	if (_definitions)
-		list (APPEND _configDefinitions ${_definitions})
-	endif()
-	list (REMOVE_DUPLICATES _configDefinitions)
-	if (COTIRE_DEBUG AND _configDefinitions)
-		message (STATUS "Target ${_target} compile definitions: ${_configDefinitions}")
-	endif()
-	set (${_definitionsVar} ${_configDefinitions} PARENT_SCOPE)
+    string (TOUPPER "${_config}" _upperConfig)
+    set (_configDefinitions "")
+    # CMAKE_INTDIR for multi-configuration build systems
+    if (NOT "${CMAKE_CFG_INTDIR}" STREQUAL ".")
+        list (APPEND _configDefinitions "CMAKE_INTDIR=\"${_config}\"")
+    endif()
+    # target export define symbol
+    cotire_get_target_export_symbol("${_target}" _defineSymbol)
+    if (_defineSymbol)
+        list (APPEND _configDefinitions "${_defineSymbol}")
+    endif()
+    # directory compile definitions
+    get_directory_property(_definitions DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}" COMPILE_DEFINITIONS)
+    if (_definitions)
+        list (APPEND _configDefinitions ${_definitions})
+    endif()
+    get_directory_property(_definitions DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}" COMPILE_DEFINITIONS_${_upperConfig})
+    if (_definitions)
+        list (APPEND _configDefinitions ${_definitions})
+    endif()
+    # target compile definitions
+    get_target_property(_definitions ${_target} COMPILE_DEFINITIONS)
+    if (_definitions)
+        list (APPEND _configDefinitions ${_definitions})
+    endif()
+    get_target_property(_definitions ${_target} COMPILE_DEFINITIONS_${_upperConfig})
+    if (_definitions)
+        list (APPEND _configDefinitions ${_definitions})
+    endif()
+    # interface compile definitions from linked library targets
+    set (_linkedTargets "")
+    cotire_get_target_usage_requirements(${_target} _linkedTargets)
+    foreach (_linkedTarget ${_linkedTargets})
+        get_target_property(_definitions ${_linkedTarget} INTERFACE_COMPILE_DEFINITIONS)
+        if (_definitions)
+            list (APPEND _configDefinitions ${_definitions})
+        endif()
+    endforeach()
+    # parse additional compile definitions from target compile flags
+    # and don't look at directory compile definitions, which we already handled
+    set (_targetFlags "")
+    cotire_get_target_compile_flags("${_config}" "${_language}" "${_target}" _targetFlags)
+    cotire_filter_compile_flags("${_language}" "D" _definitions _ignore ${_targetFlags})
+    if (_definitions)
+        list (APPEND _configDefinitions ${_definitions})
+    endif()
+    list (REMOVE_DUPLICATES _configDefinitions)
+    if (COTIRE_DEBUG AND _configDefinitions)
+        message (STATUS "Target ${_target} compile definitions: ${_configDefinitions}")
+    endif()
+    set (${_definitionsVar} ${_configDefinitions} PARENT_SCOPE)
 endfunction()

 function (cotire_get_target_compiler_flags _config _language _target _compilerFlagsVar)
-	# parse target compile flags omitting compile definitions and include directives
-	set (_targetFlags "")
-	cotire_get_target_compile_flags("${_config}" "${_language}" "${_target}" _targetFlags)
-	set (_compilerFlags "")
-	cotire_filter_compile_flags("${_language}" "[ID]" _ignore _compilerFlags ${_targetFlags})
-	if (COTIRE_DEBUG AND _compilerFlags)
-		message (STATUS "Target ${_target} compiler flags: ${_compilerFlags}")
-	endif()
-	set (${_compilerFlagsVar} ${_compilerFlags} PARENT_SCOPE)
+    # parse target compile flags omitting compile definitions and include directives
+    set (_targetFlags "")
+    cotire_get_target_compile_flags("${_config}" "${_language}" "${_target}" _targetFlags)
+    set (_flagFilter "D")
+    if (CMAKE_INCLUDE_FLAG_${_language})
+        string (STRIP "${CMAKE_INCLUDE_FLAG_${_language}}" _includeFlag)
+        string (REGEX REPLACE "^[-/]+" "" _includeFlag "${_includeFlag}")
+        if (_includeFlag)
+            set (_flagFilter "${_flagFilter}|${_includeFlag}")
+        endif()
+    endif()
+    if (CMAKE_INCLUDE_SYSTEM_FLAG_${_language})
+        string (STRIP "${CMAKE_INCLUDE_SYSTEM_FLAG_${_language}}" _includeFlag)
+        string (REGEX REPLACE "^[-/]+" "" _includeFlag "${_includeFlag}")
+        if (_includeFlag)
+            set (_flagFilter "${_flagFilter}|${_includeFlag}")
+        endif()
+    endif()
+    set (_compilerFlags "")
+    cotire_filter_compile_flags("${_language}" "${_flagFilter}" _ignore _compilerFlags ${_targetFlags})
+    if (COTIRE_DEBUG AND _compilerFlags)
+        message (STATUS "Target ${_target} compiler flags: ${_compilerFlags}")
+    endif()
+    set (${_compilerFlagsVar} ${_compilerFlags} PARENT_SCOPE)
 endfunction()

 function (cotire_add_sys_root_paths _pathsVar)
-	if (APPLE)
-		if (CMAKE_OSX_SYSROOT AND CMAKE_${_language}_HAS_ISYSROOT)
-			foreach (_path IN LISTS ${_pathsVar})
-				if (IS_ABSOLUTE "${_path}")
-					get_filename_component(_path "${CMAKE_OSX_SYSROOT}/${_path}" ABSOLUTE)
-					if (EXISTS "${_path}")
-						list (APPEND ${_pathsVar} "${_path}")
-					endif()
-				endif()
-			endforeach()
-		endif()
-	endif()
-	set (${_pathsVar} ${${_pathsVar}} PARENT_SCOPE)
+    if (APPLE)
+        if (CMAKE_OSX_SYSROOT AND CMAKE_${_language}_HAS_ISYSROOT)
+            foreach (_path IN LISTS ${_pathsVar})
+                if (IS_ABSOLUTE "${_path}")
+                    get_filename_component(_path "${CMAKE_OSX_SYSROOT}/${_path}" ABSOLUTE)
+                    if (EXISTS "${_path}")
+                        list (APPEND ${_pathsVar} "${_path}")
+                    endif()
+                endif()
+            endforeach()
+        endif()
+    endif()
+    set (${_pathsVar} ${${_pathsVar}} PARENT_SCOPE)
 endfunction()

 function (cotire_get_source_extra_properties _sourceFile _pattern _resultVar)
-	set (_extraProperties ${ARGN})
-	set (_result "")
-	if (_extraProperties)
-		list (FIND _extraProperties "${_sourceFile}" _index)
-		if (_index GREATER -1)
-			math (EXPR _index "${_index} + 1")
-			list (LENGTH _extraProperties _len)
-			math (EXPR _len "${_len} - 1")
-			foreach (_index RANGE ${_index} ${_len})
-				list (GET _extraProperties ${_index} _value)
-				if (_value MATCHES "${_pattern}")
-					list (APPEND _result "${_value}")
-				else()
-					break()
-				endif()
-			endforeach()
-		endif()
-	endif()
-	set (${_resultVar} ${_result} PARENT_SCOPE)
+    set (_extraProperties ${ARGN})
+    set (_result "")
+    if (_extraProperties)
+        list (FIND _extraProperties "${_sourceFile}" _index)
+        if (_index GREATER -1)
+            math (EXPR _index "${_index} + 1")
+            list (LENGTH _extraProperties _len)
+            math (EXPR _len "${_len} - 1")
+            foreach (_index RANGE ${_index} ${_len})
+                list (GET _extraProperties ${_index} _value)
+                if (_value MATCHES "${_pattern}")
+                    list (APPEND _result "${_value}")
+                else()
+                    break()
+                endif()
+            endforeach()
+        endif()
+    endif()
+    set (${_resultVar} ${_result} PARENT_SCOPE)
 endfunction()

 function (cotire_get_source_compile_definitions _config _language _sourceFile _definitionsVar)
-	set (_compileDefinitions "")
-	if (NOT CMAKE_SCRIPT_MODE_FILE)
-		string (TOUPPER "${_config}" _upperConfig)
-		get_source_file_property(_definitions "${_sourceFile}" COMPILE_DEFINITIONS)
-		if (_definitions)
-			list (APPEND _compileDefinitions ${_definitions})
-		endif()
-		get_source_file_property(_definitions "${_sourceFile}" COMPILE_DEFINITIONS_${_upperConfig})
-		if (_definitions)
-			list (APPEND _compileDefinitions ${_definitions})
-		endif()
-	endif()
-	cotire_get_source_extra_properties("${_sourceFile}" "^[a-zA-Z0-9_]+(=.*)?$" _definitions ${ARGN})
-	if (_definitions)
-		list (APPEND _compileDefinitions ${_definitions})
-	endif()
-	if (COTIRE_DEBUG AND _compileDefinitions)
-		message (STATUS "Source ${_sourceFile} compile definitions: ${_compileDefinitions}")
-	endif()
-	set (${_definitionsVar} ${_compileDefinitions} PARENT_SCOPE)
+    set (_compileDefinitions "")
+    if (NOT CMAKE_SCRIPT_MODE_FILE)
+        string (TOUPPER "${_config}" _upperConfig)
+        get_source_file_property(_definitions "${_sourceFile}" COMPILE_DEFINITIONS)
+        if (_definitions)
+            list (APPEND _compileDefinitions ${_definitions})
+        endif()
+        get_source_file_property(_definitions "${_sourceFile}" COMPILE_DEFINITIONS_${_upperConfig})
+        if (_definitions)
+            list (APPEND _compileDefinitions ${_definitions})
+        endif()
+    endif()
+    cotire_get_source_extra_properties("${_sourceFile}" "^[a-zA-Z0-9_]+(=.*)?$" _definitions ${ARGN})
+    if (_definitions)
+        list (APPEND _compileDefinitions ${_definitions})
+    endif()
+    if (COTIRE_DEBUG AND _compileDefinitions)
+        message (STATUS "Source ${_sourceFile} compile definitions: ${_compileDefinitions}")
+    endif()
+    set (${_definitionsVar} ${_compileDefinitions} PARENT_SCOPE)
 endfunction()

 function (cotire_get_source_files_compile_definitions _config _language _definitionsVar)
-	set (_configDefinitions "")
-	foreach (_sourceFile ${ARGN})
-		cotire_get_source_compile_definitions("${_config}" "${_language}" "${_sourceFile}" _sourceDefinitions)
-		if (_sourceDefinitions)
-			list (APPEND _configDefinitions "${_sourceFile}" ${_sourceDefinitions} "-")
-		endif()
-	endforeach()
-	set (${_definitionsVar} ${_configDefinitions} PARENT_SCOPE)
+    set (_configDefinitions "")
+    foreach (_sourceFile ${ARGN})
+        cotire_get_source_compile_definitions("${_config}" "${_language}" "${_sourceFile}" _sourceDefinitions)
+        if (_sourceDefinitions)
+            list (APPEND _configDefinitions "${_sourceFile}" ${_sourceDefinitions} "-")
+        endif()
+    endforeach()
+    set (${_definitionsVar} ${_configDefinitions} PARENT_SCOPE)
 endfunction()

 function (cotire_get_source_undefs _sourceFile _property _sourceUndefsVar)
-	set (_sourceUndefs "")
-	if (NOT CMAKE_SCRIPT_MODE_FILE)
-		get_source_file_property(_undefs "${_sourceFile}" ${_property})
-		if (_undefs)
-			list (APPEND _sourceUndefs ${_undefs})
-		endif()
-	endif()
-	cotire_get_source_extra_properties("${_sourceFile}" "^[a-zA-Z0-9_]+$" _undefs ${ARGN})
-	if (_undefs)
-		list (APPEND _sourceUndefs ${_undefs})
-	endif()
-	if (COTIRE_DEBUG AND _sourceUndefs)
-		message (STATUS "Source ${_sourceFile} ${_property} undefs: ${_sourceUndefs}")
-	endif()
-	set (${_sourceUndefsVar} ${_sourceUndefs} PARENT_SCOPE)
+    set (_sourceUndefs "")
+    if (NOT CMAKE_SCRIPT_MODE_FILE)
+        get_source_file_property(_undefs "${_sourceFile}" ${_property})
+        if (_undefs)
+            list (APPEND _sourceUndefs ${_undefs})
+        endif()
+    endif()
+    cotire_get_source_extra_properties("${_sourceFile}" "^[a-zA-Z0-9_]+$" _undefs ${ARGN})
+    if (_undefs)
+        list (APPEND _sourceUndefs ${_undefs})
+    endif()
+    if (COTIRE_DEBUG AND _sourceUndefs)
+        message (STATUS "Source ${_sourceFile} ${_property} undefs: ${_sourceUndefs}")
+    endif()
+    set (${_sourceUndefsVar} ${_sourceUndefs} PARENT_SCOPE)
 endfunction()

 function (cotire_get_source_files_undefs _property _sourceUndefsVar)
-	set (_sourceUndefs "")
-	foreach (_sourceFile ${ARGN})
-		cotire_get_source_undefs("${_sourceFile}" ${_property} _undefs)
-		if (_undefs)
-			list (APPEND _sourceUndefs "${_sourceFile}" ${_undefs} "-")
-		endif()
-	endforeach()
-	set (${_sourceUndefsVar} ${_sourceUndefs} PARENT_SCOPE)
+    set (_sourceUndefs "")
+    foreach (_sourceFile ${ARGN})
+        cotire_get_source_undefs("${_sourceFile}" ${_property} _undefs)
+        if (_undefs)
+            list (APPEND _sourceUndefs "${_sourceFile}" ${_undefs} "-")
+        endif()
+    endforeach()
+    set (${_sourceUndefsVar} ${_sourceUndefs} PARENT_SCOPE)
 endfunction()

 macro (cotire_set_cmd_to_prologue _cmdVar)
-	set (${_cmdVar} "${CMAKE_COMMAND}")
-	if (COTIRE_DEBUG)
-		list (APPEND ${_cmdVar} "--warn-uninitialized")
-	endif()
-	list (APPEND ${_cmdVar} "-DCOTIRE_BUILD_TYPE:STRING=$<CONFIGURATION>")
-	if (COTIRE_VERBOSE)
-		list (APPEND ${_cmdVar} "-DCOTIRE_VERBOSE:BOOL=ON")
-	elseif("${CMAKE_GENERATOR}" MATCHES "Makefiles")
-		list (APPEND ${_cmdVar} "-DCOTIRE_VERBOSE:BOOL=$(VERBOSE)")
-	endif()
+    set (${_cmdVar} "${CMAKE_COMMAND}")
+    if (COTIRE_DEBUG)
+        list (APPEND ${_cmdVar} "--warn-uninitialized")
+    endif()
+    list (APPEND ${_cmdVar} "-DCOTIRE_BUILD_TYPE:STRING=$<CONFIGURATION>")
+    if (COTIRE_VERBOSE)
+        list (APPEND ${_cmdVar} "-DCOTIRE_VERBOSE:BOOL=ON")
+    elseif("${CMAKE_GENERATOR}" MATCHES "Makefiles")
+        list (APPEND ${_cmdVar} "-DCOTIRE_VERBOSE:BOOL=$(VERBOSE)")
+    endif()
 endmacro()

 function (cotire_init_compile_cmd _cmdVar _language _compilerExe _compilerArg1)
-	if (NOT _compilerExe)
-		set (_compilerExe "${CMAKE_${_language}_COMPILER}")
-	endif()
-	if (NOT _compilerArg1)
-		set (_compilerArg1 ${CMAKE_${_language}_COMPILER_ARG1})
-	endif()
-	string (STRIP "${_compilerArg1}" _compilerArg1)
-	set (${_cmdVar} "${_compilerExe}" ${_compilerArg1} PARENT_SCOPE)
+    if (NOT _compilerExe)
+        set (_compilerExe "${CMAKE_${_language}_COMPILER}")
+    endif()
+    if (NOT _compilerArg1)
+        set (_compilerArg1 ${CMAKE_${_language}_COMPILER_ARG1})
+    endif()
+    string (STRIP "${_compilerArg1}" _compilerArg1)
+    set (${_cmdVar} "${_compilerExe}" ${_compilerArg1} PARENT_SCOPE)
 endfunction()

 macro (cotire_add_definitions_to_cmd _cmdVar _language)
-	foreach (_definition ${ARGN})
-		if (WIN32 AND CMAKE_${_language}_COMPILER_ID MATCHES "MSVC|Intel")
-			list (APPEND ${_cmdVar} "/D${_definition}")
-		else()
-			list (APPEND ${_cmdVar} "-D${_definition}")
-		endif()
-	endforeach()
+    foreach (_definition ${ARGN})
+        if (WIN32 AND CMAKE_${_language}_COMPILER_ID MATCHES "MSVC|Intel")
+            list (APPEND ${_cmdVar} "/D${_definition}")
+        else()
+            list (APPEND ${_cmdVar} "-D${_definition}")
+        endif()
+    endforeach()
 endmacro()

-macro (cotire_add_includes_to_cmd _cmdVar _language _includeSystemFlag _includesVar _systemIncludesVar)
-	foreach (_include ${${_includesVar}})
-		if (WIN32 AND CMAKE_${_language}_COMPILER_ID MATCHES "MSVC|Intel")
-			file (TO_NATIVE_PATH "${_include}" _include)
-			list (APPEND ${_cmdVar} "/I${_include}")
-		else()
-			list (FIND ${_systemIncludesVar} ${_include} _index)
-			if(_index GREATER -1 AND NOT "${_includeSystemFlag}" STREQUAL "")
-				list (APPEND ${_cmdVar} "${_includeSystemFlag}${_include}")
-			else()
-				list (APPEND ${_cmdVar} "-I${_include}")
-			endif()
-		endif()
-	endforeach()
+function (cotire_add_includes_to_cmd _cmdVar _language _includesVar _systemIncludesVar)
+    set (_includeDirs ${${_includesVar}} ${${_systemIncludesVar}})
+    if (_includeDirs)
+        list (REMOVE_DUPLICATES _includeDirs)
+        foreach (_include ${_includeDirs})
+            if (WIN32 AND CMAKE_${_language}_COMPILER_ID MATCHES "MSVC|Intel")
+                file (TO_NATIVE_PATH "${_include}" _include)
+                list (APPEND ${_cmdVar} "${CMAKE_INCLUDE_FLAG_${_language}}${CMAKE_INCLUDE_FLAG_${_language}_SEP}${_include}")
+            else()
+                set (_index -1)
+                if ("${CMAKE_INCLUDE_SYSTEM_FLAG_${_language}}" MATCHES ".+")
+                    list (FIND ${_systemIncludesVar} "${_include}" _index)
+                endif()
+                if (_index GREATER -1)
+                    list (APPEND ${_cmdVar} "${CMAKE_INCLUDE_SYSTEM_FLAG_${_language}}${_include}")
+                else()
+                    list (APPEND ${_cmdVar} "${CMAKE_INCLUDE_FLAG_${_language}}${CMAKE_INCLUDE_FLAG_${_language}_SEP}${_include}")
+                endif()
+            endif()
+        endforeach()
+    endif()
+    set (${_cmdVar} ${${_cmdVar}} PARENT_SCOPE)
+endfunction()
+
+function (cotire_add_frameworks_to_cmd _cmdVar _language _includesVar _systemIncludesVar)
+    if (APPLE)
+        set (_frameworkDirs "")
+        foreach (_include ${${_includesVar}})
+            if (IS_ABSOLUTE "${_include}" AND _include MATCHES "\\.framework$")
+                get_filename_component(_frameworkDir "${_include}" DIRECTORY)
+                list (APPEND _frameworkDirs "${_frameworkDir}")
+            endif()
+        endforeach()
+        set (_systemFrameworkDirs "")
+        foreach (_include ${${_systemIncludesVar}})
+            if (IS_ABSOLUTE "${_include}" AND _include MATCHES "\\.framework$")
+                get_filename_component(_frameworkDir "${_include}" DIRECTORY)
+                list (APPEND _systemFrameworkDirs "${_frameworkDir}")
+            endif()
+        endforeach()
+        if (_systemFrameworkDirs)
+            list (APPEND _frameworkDirs ${_systemFrameworkDirs})
+        endif()
+        if (_frameworkDirs)
+            list (REMOVE_DUPLICATES _frameworkDirs)
+            foreach (_frameworkDir ${_frameworkDirs})
+                set (_index -1)
+                if ("${CMAKE_${_language}_SYSTEM_FRAMEWORK_SEARCH_FLAG}" MATCHES ".+")
+                    list (FIND _systemFrameworkDirs "${_frameworkDir}" _index)
+                endif()
+                if (_index GREATER -1)
+                    list (APPEND ${_cmdVar} "${CMAKE_${_language}_SYSTEM_FRAMEWORK_SEARCH_FLAG}${_frameworkDir}")
+                else()
+                    list (APPEND ${_cmdVar} "${CMAKE_${_language}_FRAMEWORK_SEARCH_FLAG}${_frameworkDir}")
+                endif()
+            endforeach()
+        endif()
+    endif()
+    set (${_cmdVar} ${${_cmdVar}} PARENT_SCOPE)
+endfunction()
+
+macro (cotire_add_compile_flags_to_cmd _cmdVar)
+    foreach (_flag ${ARGN})
+        list (APPEND ${_cmdVar} "${_flag}")
+    endforeach()
 endmacro()

-macro (cotire_add_frameworks_to_cmd _cmdVar _language)
-	if (APPLE)
-		set (_frameWorkDirs "")
-		foreach (_include ${ARGN})
-			if (IS_ABSOLUTE "${_include}" AND _include MATCHES "\\.framework$")
-				get_filename_component(_frameWorkDir "${_include}" PATH)
-				list (APPEND _frameWorkDirs "${_frameWorkDir}")
-			endif()
-		endforeach()
-		if (_frameWorkDirs)
-			list (REMOVE_DUPLICATES _frameWorkDirs)
-			foreach (_frameWorkDir ${_frameWorkDirs})
-				list (APPEND ${_cmdVar} "-F${_frameWorkDir}")
-			endforeach()
-		endif()
-	endif()
+function (cotire_check_file_up_to_date _fileIsUpToDateVar _file)
+    if (EXISTS "${_file}")
+        set (_triggerFile "")
+        foreach (_dependencyFile ${ARGN})
+            if (EXISTS "${_dependencyFile}")
+                # IS_NEWER_THAN returns TRUE if both files have the same timestamp
+                # thus we do the comparison in both directions to exclude ties
+                if ("${_dependencyFile}" IS_NEWER_THAN "${_file}" AND
+                    NOT "${_file}" IS_NEWER_THAN "${_dependencyFile}")
+                    set (_triggerFile "${_dependencyFile}")
+                    break()
+                endif()
+            endif()
+        endforeach()
+        if (_triggerFile)
+            if (COTIRE_VERBOSE)
+                get_filename_component(_fileName "${_file}" NAME)
+                message (STATUS "${_fileName} update triggered by ${_triggerFile} change.")
+            endif()
+            set (${_fileIsUpToDateVar} FALSE PARENT_SCOPE)
+        else()
+            if (COTIRE_VERBOSE)
+                get_filename_component(_fileName "${_file}" NAME)
+                message (STATUS "${_fileName} is up-to-date.")
+            endif()
+            set (${_fileIsUpToDateVar} TRUE PARENT_SCOPE)
+        endif()
+    else()
+        if (COTIRE_VERBOSE)
+            get_filename_component(_fileName "${_file}" NAME)
+            message (STATUS "${_fileName} does not exist yet.")
+        endif()
+        set (${_fileIsUpToDateVar} FALSE PARENT_SCOPE)
+    endif()
+endfunction()
+
+macro (cotire_find_closest_relative_path _headerFile _includeDirs _relPathVar)
+    set (${_relPathVar} "")
+    foreach (_includeDir ${_includeDirs})
+        if (IS_DIRECTORY "${_includeDir}")
+            file (RELATIVE_PATH _relPath "${_includeDir}" "${_headerFile}")
+            if (NOT IS_ABSOLUTE "${_relPath}" AND NOT "${_relPath}" MATCHES "^\\.\\.")
+                string (LENGTH "${${_relPathVar}}" _closestLen)
+                string (LENGTH "${_relPath}" _relLen)
+                if (_closestLen EQUAL 0 OR _relLen LESS _closestLen)
+                    set (${_relPathVar} "${_relPath}")
+                endif()
+            endif()
+        elseif ("${_includeDir}" STREQUAL "${_headerFile}")
+            # if path matches exactly, return short non-empty string
+            set (${_relPathVar} "1")
+            break()
+        endif()
+    endforeach()
 endmacro()

-macro (cotire_add_compile_flags_to_cmd _cmdVar)
-	foreach (_flag ${ARGN})
-		list (APPEND ${_cmdVar} "${_flag}")
-	endforeach()
+macro (cotire_check_header_file_location _headerFile _insideIncludeDirs _outsideIncludeDirs _headerIsInside)
+    # check header path against ignored and honored include directories
+    cotire_find_closest_relative_path("${_headerFile}" "${_insideIncludeDirs}" _insideRelPath)
+    if (_insideRelPath)
+        # header is inside, but could be become outside if there is a shorter outside match
+        cotire_find_closest_relative_path("${_headerFile}" "${_outsideIncludeDirs}" _outsideRelPath)
+        if (_outsideRelPath)
+            string (LENGTH "${_insideRelPath}" _insideRelPathLen)
+            string (LENGTH "${_outsideRelPath}" _outsideRelPathLen)
+            if (_outsideRelPathLen LESS _insideRelPathLen)
+                set (${_headerIsInside} FALSE)
+            else()
+                set (${_headerIsInside} TRUE)
+            endif()
+        else()
+            set (${_headerIsInside} TRUE)
+        endif()
+    else()
+        # header is outside
+        set (${_headerIsInside} FALSE)
+    endif()
 endmacro()

-function (cotire_check_file_up_to_date _fileIsUpToDateVar _file)
-	if (EXISTS "${_file}")
-		set (_triggerFile "")
-		foreach (_dependencyFile ${ARGN})
-			if (EXISTS "${_dependencyFile}")
-				# IS_NEWER_THAN returns TRUE if both files have the same timestamp
-				# thus we do the comparison in both directions to exclude ties
-				if ("${_dependencyFile}" IS_NEWER_THAN "${_file}" AND
-					NOT "${_file}" IS_NEWER_THAN "${_dependencyFile}")
-					set (_triggerFile "${_dependencyFile}")
-					break()
-				endif()
-			endif()
-		endforeach()
-		if (_triggerFile)
-			if (COTIRE_VERBOSE)
-				get_filename_component(_fileName "${_file}" NAME)
-				message (STATUS "${_fileName} update triggered by ${_triggerFile} change.")
-			endif()
-			set (${_fileIsUpToDateVar} FALSE PARENT_SCOPE)
-		else()
-			if (COTIRE_VERBOSE)
-				get_filename_component(_fileName "${_file}" NAME)
-				message (STATUS "${_fileName} is up-to-date.")
-			endif()
-			set (${_fileIsUpToDateVar} TRUE PARENT_SCOPE)
-		endif()
-	else()
-		if (COTIRE_VERBOSE)
-			get_filename_component(_fileName "${_file}" NAME)
-			message (STATUS "${_fileName} does not exist yet.")
-		endif()
-		set (${_fileIsUpToDateVar} FALSE PARENT_SCOPE)
-	endif()
-endfunction()
-
-macro (cotire_find_closest_relative_path _headerFile _includeDirs _relPathVar)
-	set (${_relPathVar} "")
-	foreach (_includeDir ${_includeDirs})
-		if (IS_DIRECTORY "${_includeDir}")
-			file (RELATIVE_PATH _relPath "${_includeDir}" "${_headerFile}")
-			if (NOT IS_ABSOLUTE "${_relPath}" AND NOT "${_relPath}" MATCHES "^\\.\\.")
-				string (LENGTH "${${_relPathVar}}" _closestLen)
-				string (LENGTH "${_relPath}" _relLen)
-				if (_closestLen EQUAL 0 OR _relLen LESS _closestLen)
-					set (${_relPathVar} "${_relPath}")
-				endif()
-			endif()
-		elseif ("${_includeDir}" STREQUAL "${_headerFile}")
-			# if path matches exactly, return short non-empty string
-			set (${_relPathVar} "1")
-			break()
-		endif()
-	endforeach()
+macro (cotire_check_ignore_header_file_path _headerFile _headerIsIgnoredVar)
+    if (NOT EXISTS "${_headerFile}")
+        set (${_headerIsIgnoredVar} TRUE)
+    elseif (IS_DIRECTORY "${_headerFile}")
+        set (${_headerIsIgnoredVar} TRUE)
+    elseif ("${_headerFile}" MATCHES "\\.\\.|[_-]fixed" AND "${_headerFile}" MATCHES "\\.h$")
+        # heuristic: ignore C headers with embedded parent directory references or "-fixed" or "_fixed" in path
+        # these often stem from using GCC #include_next tricks, which may break the precompiled header compilation
+        # with the error message "error: no include path in which to search for header.h"
+        set (${_headerIsIgnoredVar} TRUE)
+    else()
+        set (${_headerIsIgnoredVar} FALSE)
+    endif()
 endmacro()

-macro (cotire_check_header_file_location _headerFile _insideIncludeDirs _outsideIncludeDirs _headerIsInside)
-	# check header path against ignored and honored include directories
-	cotire_find_closest_relative_path("${_headerFile}" "${_insideIncludeDirs}" _insideRelPath)
-	if (_insideRelPath)
-		# header is inside, but could be become outside if there is a shorter outside match
-		cotire_find_closest_relative_path("${_headerFile}" "${_outsideIncludeDirs}" _outsideRelPath)
-		if (_outsideRelPath)
-			string (LENGTH "${_insideRelPath}" _insideRelPathLen)
-			string (LENGTH "${_outsideRelPath}" _outsideRelPathLen)
-			if (_outsideRelPathLen LESS _insideRelPathLen)
-				set (${_headerIsInside} FALSE)
-			else()
-				set (${_headerIsInside} TRUE)
-			endif()
-		else()
-			set (${_headerIsInside} TRUE)
-		endif()
-	else()
-		# header is outside
-		set (${_headerIsInside} FALSE)
-	endif()
+macro (cotire_check_ignore_header_file_ext _headerFile _ignoreExtensionsVar _headerIsIgnoredVar)
+    # check header file extension
+    cotire_get_source_file_extension("${_headerFile}" _headerFileExt)
+    set (${_headerIsIgnoredVar} FALSE)
+    if (_headerFileExt)
+        list (FIND ${_ignoreExtensionsVar} "${_headerFileExt}" _index)
+        if (_index GREATER -1)
+            set (${_headerIsIgnoredVar} TRUE)
+        endif()
+    endif()
 endmacro()

-macro (cotire_check_ignore_header_file_path _headerFile _headerIsIgnoredVar)
-	if (NOT EXISTS "${_headerFile}")
-		set (${_headerIsIgnoredVar} TRUE)
-	elseif (IS_DIRECTORY "${_headerFile}")
-		set (${_headerIsIgnoredVar} TRUE)
-	elseif ("${_headerFile}" MATCHES "\\.\\.|[_-]fixed" AND "${_headerFile}" MATCHES "\\.h$")
-		# heuristic: ignore C headers with embedded parent directory references or "-fixed" or "_fixed" in path
-		# these often stem from using GCC #include_next tricks, which may break the precompiled header compilation
-		# with the error message "error: no include path in which to search for header.h"
-		set (${_headerIsIgnoredVar} TRUE)
-	else()
-		set (${_headerIsIgnoredVar} FALSE)
-	endif()
+macro (cotire_parse_line _line _headerFileVar _headerDepthVar)
+    if (MSVC)
+        # cl.exe /showIncludes output looks different depending on the language pack used, e.g.:
+        # English: "Note: including file:   C:\directory\file"
+        # German: "Hinweis: Einlesen der Datei:   C:\directory\file"
+        # We use a very general regular expression, relying on the presence of the : characters
+        if (_line MATCHES "( +)([a-zA-Z]:[^:]+)$")
+            # Visual Studio compiler output
+            string (LENGTH "${CMAKE_MATCH_1}" ${_headerDepthVar})
+            get_filename_component(${_headerFileVar} "${CMAKE_MATCH_2}" ABSOLUTE)
+        else()
+            set (${_headerFileVar} "")
+            set (${_headerDepthVar} 0)
+        endif()
+    else()
+        if (_line MATCHES "^(\\.+) (.*)$")
+            # GCC like output
+            string (LENGTH "${CMAKE_MATCH_1}" ${_headerDepthVar})
+            if (IS_ABSOLUTE "${CMAKE_MATCH_2}")
+                set (${_headerFileVar} "${CMAKE_MATCH_2}")
+            else()
+                get_filename_component(${_headerFileVar} "${CMAKE_MATCH_2}" REALPATH)
+            endif()
+        else()
+            set (${_headerFileVar} "")
+            set (${_headerDepthVar} 0)
+        endif()
+    endif()
 endmacro()

-macro (cotire_check_ignore_header_file_ext _headerFile _ignoreExtensionsVar _headerIsIgnoredVar)
-	# check header file extension
-	cotire_get_source_file_extension("${_headerFile}" _headerFileExt)
-	set (${_headerIsIgnoredVar} FALSE)
-	if (_headerFileExt)
-		list (FIND ${_ignoreExtensionsVar} "${_headerFileExt}" _index)
-		if (_index GREATER -1)
-			set (${_headerIsIgnoredVar} TRUE)
-		endif()
-	endif()
+function (cotire_parse_includes _language _scanOutput _ignoredIncludeDirs _honoredIncludeDirs _ignoredExtensions _selectedIncludesVar _unparsedLinesVar)
+    if (WIN32)
+        # prevent CMake macro invocation errors due to backslash characters in Windows paths
+        string (REPLACE "\\" "/" _scanOutput "${_scanOutput}")
+    endif()
+    # canonize slashes
+    string (REPLACE "//" "/" _scanOutput "${_scanOutput}")
+    # prevent semicolon from being interpreted as a line separator
+    string (REPLACE ";" "\\;" _scanOutput "${_scanOutput}")
+    # then separate lines
+    string (REGEX REPLACE "\n" ";" _scanOutput "${_scanOutput}")
+    list (LENGTH _scanOutput _len)
+    # remove duplicate lines to speed up parsing
+    list (REMOVE_DUPLICATES _scanOutput)
+    list (LENGTH _scanOutput _uniqueLen)
+    if (COTIRE_VERBOSE OR COTIRE_DEBUG)
+        message (STATUS "Scanning ${_uniqueLen} unique lines of ${_len} for includes")
+        if (_ignoredExtensions)
+            message (STATUS "Ignored extensions: ${_ignoredExtensions}")
+        endif()
+        if (_ignoredIncludeDirs)
+            message (STATUS "Ignored paths: ${_ignoredIncludeDirs}")
+        endif()
+        if (_honoredIncludeDirs)
+            message (STATUS "Included paths: ${_honoredIncludeDirs}")
+        endif()
+    endif()
+    set (_sourceFiles ${ARGN})
+    set (_selectedIncludes "")
+    set (_unparsedLines "")
+    # stack keeps track of inside/outside project status of processed header files
+    set (_headerIsInsideStack "")
+    foreach (_line IN LISTS _scanOutput)
+        if (_line)
+            cotire_parse_line("${_line}" _headerFile _headerDepth)
+            if (_headerFile)
+                cotire_check_header_file_location("${_headerFile}" "${_ignoredIncludeDirs}" "${_honoredIncludeDirs}" _headerIsInside)
+                if (COTIRE_DEBUG)
+                    message (STATUS "${_headerDepth}: ${_headerFile} ${_headerIsInside}")
+                endif()
+                # update stack
+                list (LENGTH _headerIsInsideStack _stackLen)
+                if (_headerDepth GREATER _stackLen)
+                    math (EXPR _stackLen "${_stackLen} + 1")
+                    foreach (_index RANGE ${_stackLen} ${_headerDepth})
+                        list (APPEND _headerIsInsideStack ${_headerIsInside})
+                    endforeach()
+                else()
+                    foreach (_index RANGE ${_headerDepth} ${_stackLen})
+                        list (REMOVE_AT _headerIsInsideStack -1)
+                    endforeach()
+                    list (APPEND _headerIsInsideStack ${_headerIsInside})
+                endif()
+                if (COTIRE_DEBUG)
+                    message (STATUS "${_headerIsInsideStack}")
+                endif()
+                # header is a candidate if it is outside project
+                if (NOT _headerIsInside)
+                    # get parent header file's inside/outside status
+                    if (_headerDepth GREATER 1)
+                        math (EXPR _index "${_headerDepth} - 2")
+                        list (GET _headerIsInsideStack ${_index} _parentHeaderIsInside)
+                    else()
+                        set (_parentHeaderIsInside TRUE)
+                    endif()
+                    # select header file if parent header file is inside project
+                    # (e.g., a project header file that includes a standard header file)
+                    if (_parentHeaderIsInside)
+                        cotire_check_ignore_header_file_path("${_headerFile}" _headerIsIgnored)
+                        if (NOT _headerIsIgnored)
+                            cotire_check_ignore_header_file_ext("${_headerFile}" _ignoredExtensions _headerIsIgnored)
+                            if (NOT _headerIsIgnored)
+                                list (APPEND _selectedIncludes "${_headerFile}")
+                            else()
+                                # fix header's inside status on stack, it is ignored by extension now
+                                list (REMOVE_AT _headerIsInsideStack -1)
+                                list (APPEND _headerIsInsideStack TRUE)
+                            endif()
+                        endif()
+                        if (COTIRE_DEBUG)
+                            message (STATUS "${_headerFile} ${_ignoredExtensions} ${_headerIsIgnored}")
+                        endif()
+                    endif()
+                endif()
+            else()
+                if (MSVC)
+                    # for cl.exe do not keep unparsed lines which solely consist of a source file name
+                    string (FIND "${_sourceFiles}" "${_line}" _index)
+                    if (_index LESS 0)
+                        list (APPEND _unparsedLines "${_line}")
+                    endif()
+                else()
+                    list (APPEND _unparsedLines "${_line}")
+                endif()
+            endif()
+        endif()
+    endforeach()
+    list (REMOVE_DUPLICATES _selectedIncludes)
+    set (${_selectedIncludesVar} ${_selectedIncludes} PARENT_SCOPE)
+    set (${_unparsedLinesVar} ${_unparsedLines} PARENT_SCOPE)
+endfunction()
+
+function (cotire_scan_includes _includesVar)
+    set(_options "")
+    set(_oneValueArgs COMPILER_ID COMPILER_EXECUTABLE COMPILER_VERSION LANGUAGE UNPARSED_LINES)
+    set(_multiValueArgs COMPILE_DEFINITIONS COMPILE_FLAGS INCLUDE_DIRECTORIES SYSTEM_INCLUDE_DIRECTORIES
+        IGNORE_PATH INCLUDE_PATH IGNORE_EXTENSIONS INCLUDE_PRIORITY_PATH)
+    cmake_parse_arguments(_option "${_options}" "${_oneValueArgs}" "${_multiValueArgs}" ${ARGN})
+    set (_sourceFiles ${_option_UNPARSED_ARGUMENTS})
+    if (NOT _option_LANGUAGE)
+        set (_option_LANGUAGE "CXX")
+    endif()
+    if (NOT _option_COMPILER_ID)
+        set (_option_COMPILER_ID "${CMAKE_${_option_LANGUAGE}_ID}")
+    endif()
+    if (NOT _option_COMPILER_VERSION)
+        set (_option_COMPILER_VERSION "${CMAKE_${_option_LANGUAGE}_COMPILER_VERSION}")
+    endif()
+    cotire_init_compile_cmd(_cmd "${_option_LANGUAGE}" "${_option_COMPILER_EXECUTABLE}" "${_option_COMPILER_ARG1}")
+    cotire_add_definitions_to_cmd(_cmd "${_option_LANGUAGE}" ${_option_COMPILE_DEFINITIONS})
+    cotire_add_compile_flags_to_cmd(_cmd ${_option_COMPILE_FLAGS})
+    cotire_add_includes_to_cmd(_cmd "${_option_LANGUAGE}" _option_INCLUDE_DIRECTORIES _option_SYSTEM_INCLUDE_DIRECTORIES)
+    cotire_add_frameworks_to_cmd(_cmd "${_option_LANGUAGE}" _option_INCLUDE_DIRECTORIES _option_SYSTEM_INCLUDE_DIRECTORIES)
+    cotire_add_makedep_flags("${_option_LANGUAGE}" "${_option_COMPILER_ID}" "${_option_COMPILER_VERSION}" _cmd)
+    # only consider existing source files for scanning
+    set (_existingSourceFiles "")
+    foreach (_sourceFile ${_sourceFiles})
+        if (EXISTS "${_sourceFile}")
+            list (APPEND _existingSourceFiles "${_sourceFile}")
+        endif()
+    endforeach()
+    if (NOT _existingSourceFiles)
+        set (${_includesVar} "" PARENT_SCOPE)
+        return()
+    endif()
+    list (APPEND _cmd ${_existingSourceFiles})
+    if (COTIRE_VERBOSE)
+        message (STATUS "execute_process: ${_cmd}")
+    endif()
+    if (_option_COMPILER_ID MATCHES "MSVC")
+        # cl.exe messes with the output streams unless the environment variable VS_UNICODE_OUTPUT is cleared
+        unset (ENV{VS_UNICODE_OUTPUT})
+    endif()
+    execute_process(
+        COMMAND ${_cmd}
+        WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
+        RESULT_VARIABLE _result
+        OUTPUT_QUIET
+        ERROR_VARIABLE _output)
+    if (_result)
+        message (STATUS "Result ${_result} scanning includes of ${_existingSourceFiles}.")
+    endif()
+    cotire_parse_includes(
+        "${_option_LANGUAGE}" "${_output}"
+        "${_option_IGNORE_PATH}" "${_option_INCLUDE_PATH}"
+        "${_option_IGNORE_EXTENSIONS}"
+        _includes _unparsedLines
+        ${_sourceFiles})
+    if (_option_INCLUDE_PRIORITY_PATH)
+        set (_sortedIncludes "")
+        foreach (_priorityPath ${_option_INCLUDE_PRIORITY_PATH})
+            foreach (_include ${_includes})
+                string (FIND ${_include} ${_priorityPath} _position)
+                if (_position GREATER -1)
+                    list (APPEND _sortedIncludes ${_include})
+                endif()
+            endforeach()
+        endforeach()
+        if (_sortedIncludes)
+            list (INSERT _includes 0 ${_sortedIncludes})
+            list (REMOVE_DUPLICATES _includes)
+        endif()
+    endif()
+    set (${_includesVar} ${_includes} PARENT_SCOPE)
+    if (_option_UNPARSED_LINES)
+        set (${_option_UNPARSED_LINES} ${_unparsedLines} PARENT_SCOPE)
+    endif()
+endfunction()
+
+macro (cotire_append_undefs _contentsVar)
+    set (_undefs ${ARGN})
+    if (_undefs)
+        list (REMOVE_DUPLICATES _undefs)
+        foreach (_definition ${_undefs})
+            list (APPEND ${_contentsVar} "#undef ${_definition}")
+        endforeach()
+    endif()
 endmacro()

-macro (cotire_parse_line _line _headerFileVar _headerDepthVar)
-	if (MSVC)
-		# cl.exe /showIncludes output looks different depending on the language pack used, e.g.:
-		# English: "Note: including file:   C:\directory\file"
-		# German: "Hinweis: Einlesen der Datei:   C:\directory\file"
-		# We use a very general regular expression, relying on the presence of the : characters
-		if (_line MATCHES "( +)([a-zA-Z]:[^:]+)$")
-			# Visual Studio compiler output
-			string (LENGTH "${CMAKE_MATCH_1}" ${_headerDepthVar})
-			get_filename_component(${_headerFileVar} "${CMAKE_MATCH_2}" ABSOLUTE)
-		else()
-			set (${_headerFileVar} "")
-			set (${_headerDepthVar} 0)
-		endif()
-	else()
-		if (_line MATCHES "^(\\.+) (.*)$")
-			# GCC like output
-			string (LENGTH "${CMAKE_MATCH_1}" ${_headerDepthVar})
-			if (IS_ABSOLUTE "${CMAKE_MATCH_2}")
-				set (${_headerFileVar} "${CMAKE_MATCH_2}")
-			else()
-				get_filename_component(${_headerFileVar} "${CMAKE_MATCH_2}" REALPATH)
-			endif()
-		else()
-			set (${_headerFileVar} "")
-			set (${_headerDepthVar} 0)
-		endif()
-	endif()
+macro (cotire_comment_str _language _commentText _commentVar)
+    if ("${_language}" STREQUAL "CMAKE")
+        set (${_commentVar} "# ${_commentText}")
+    else()
+        set (${_commentVar} "/* ${_commentText} */")
+    endif()
 endmacro()

-function (cotire_parse_includes _language _scanOutput _ignoredIncludeDirs _honoredIncludeDirs _ignoredExtensions _selectedIncludesVar _unparsedLinesVar)
-	if (WIN32)
-		# prevent CMake macro invocation errors due to backslash characters in Windows paths
-		string (REPLACE "\\" "/" _scanOutput "${_scanOutput}")
-	endif()
-	# canonize slashes
-	string (REPLACE "//" "/" _scanOutput "${_scanOutput}")
-	# prevent semicolon from being interpreted as a line separator
-	string (REPLACE ";" "\\;" _scanOutput "${_scanOutput}")
-	# then separate lines
-	string (REGEX REPLACE "\n" ";" _scanOutput "${_scanOutput}")
-	list (LENGTH _scanOutput _len)
-	# remove duplicate lines to speed up parsing
-	list (REMOVE_DUPLICATES _scanOutput)
-	list (LENGTH _scanOutput _uniqueLen)
-	if (COTIRE_VERBOSE OR COTIRE_DEBUG)
-		message (STATUS "Scanning ${_uniqueLen} unique lines of ${_len} for includes")
-		if (_ignoredExtensions)
-			message (STATUS "Ignored extensions: ${_ignoredExtensions}")
-		endif()
-		if (_ignoredIncludeDirs)
-			message (STATUS "Ignored paths: ${_ignoredIncludeDirs}")
-		endif()
-		if (_honoredIncludeDirs)
-			message (STATUS "Included paths: ${_honoredIncludeDirs}")
-		endif()
-	endif()
-	set (_sourceFiles ${ARGN})
-	set (_selectedIncludes "")
-	set (_unparsedLines "")
-	# stack keeps track of inside/outside project status of processed header files
-	set (_headerIsInsideStack "")
-	foreach (_line IN LISTS _scanOutput)
-		if (_line)
-			cotire_parse_line("${_line}" _headerFile _headerDepth)
-			if (_headerFile)
-				cotire_check_header_file_location("${_headerFile}" "${_ignoredIncludeDirs}" "${_honoredIncludeDirs}" _headerIsInside)
-				if (COTIRE_DEBUG)
-					message (STATUS "${_headerDepth}: ${_headerFile} ${_headerIsInside}")
-				endif()
-				# update stack
-				list (LENGTH _headerIsInsideStack _stackLen)
-				if (_headerDepth GREATER _stackLen)
-					math (EXPR _stackLen "${_stackLen} + 1")
-					foreach (_index RANGE ${_stackLen} ${_headerDepth})
-						list (APPEND _headerIsInsideStack ${_headerIsInside})
-					endforeach()
-				else()
-					foreach (_index RANGE ${_headerDepth} ${_stackLen})
-						list (REMOVE_AT _headerIsInsideStack -1)
-					endforeach()
-					list (APPEND _headerIsInsideStack ${_headerIsInside})
-				endif()
-				if (COTIRE_DEBUG)
-					message (STATUS "${_headerIsInsideStack}")
-				endif()
-				# header is a candidate if it is outside project
-				if (NOT _headerIsInside)
-					# get parent header file's inside/outside status
-					if (_headerDepth GREATER 1)
-						math (EXPR _index "${_headerDepth} - 2")
-						list (GET _headerIsInsideStack ${_index} _parentHeaderIsInside)
-					else()
-						set (_parentHeaderIsInside TRUE)
-					endif()
-					# select header file if parent header file is inside project
-					# (e.g., a project header file that includes a standard header file)
-					if (_parentHeaderIsInside)
-						cotire_check_ignore_header_file_path("${_headerFile}" _headerIsIgnored)
-						if (NOT _headerIsIgnored)
-							cotire_check_ignore_header_file_ext("${_headerFile}" _ignoredExtensions _headerIsIgnored)
-							if (NOT _headerIsIgnored)
-								list (APPEND _selectedIncludes "${_headerFile}")
-							else()
-								# fix header's inside status on stack, it is ignored by extension now
-								list (REMOVE_AT _headerIsInsideStack -1)
-								list (APPEND _headerIsInsideStack TRUE)
-							endif()
-						endif()
-						if (COTIRE_DEBUG)
-							message (STATUS "${_headerFile} ${_ignoredExtensions} ${_headerIsIgnored}")
-						endif()
-					endif()
-				endif()
-			else()
-				if (MSVC)
-					# for cl.exe do not keep unparsed lines which solely consist of a source file name
-					string (FIND "${_sourceFiles}" "${_line}" _index)
-					if (_index LESS 0)
-						list (APPEND _unparsedLines "${_line}")
-					endif()
-				else()
-					list (APPEND _unparsedLines "${_line}")
-				endif()
-			endif()
-		endif()
-	endforeach()
-	list (REMOVE_DUPLICATES _selectedIncludes)
-	set (${_selectedIncludesVar} ${_selectedIncludes} PARENT_SCOPE)
-	set (${_unparsedLinesVar} ${_unparsedLines} PARENT_SCOPE)
-endfunction()
-
-function (cotire_scan_includes _includesVar)
-	set(_options "")
-	set(_oneValueArgs COMPILER_ID COMPILER_EXECUTABLE COMPILER_VERSION INCLUDE_SYSTEM_FLAG LANGUAGE UNPARSED_LINES)
-	set(_multiValueArgs COMPILE_DEFINITIONS COMPILE_FLAGS INCLUDE_DIRECTORIES SYSTEM_INCLUDE_DIRECTORIES
-		IGNORE_PATH INCLUDE_PATH IGNORE_EXTENSIONS INCLUDE_PRIORITY_PATH)
-	cmake_parse_arguments(_option "${_options}" "${_oneValueArgs}" "${_multiValueArgs}" ${ARGN})
-	set (_sourceFiles ${_option_UNPARSED_ARGUMENTS})
-	if (NOT _option_LANGUAGE)
-		set (_option_LANGUAGE "CXX")
-	endif()
-	if (NOT _option_COMPILER_ID)
-		set (_option_COMPILER_ID "${CMAKE_${_option_LANGUAGE}_ID}")
-	endif()
-	if (NOT _option_COMPILER_VERSION)
-		set (_option_COMPILER_VERSION "${CMAKE_${_option_LANGUAGE}_COMPILER_VERSION}")
-	endif()
-	set (_cmd "${_option_COMPILER_EXECUTABLE}" ${_option_COMPILER_ARG1})
-	cotire_init_compile_cmd(_cmd "${_option_LANGUAGE}" "${_option_COMPILER_EXECUTABLE}" "${_option_COMPILER_ARG1}")
-	cotire_add_definitions_to_cmd(_cmd "${_option_LANGUAGE}" ${_option_COMPILE_DEFINITIONS})
-	cotire_add_compile_flags_to_cmd(_cmd ${_option_COMPILE_FLAGS})
-	cotire_add_includes_to_cmd(_cmd "${_option_LANGUAGE}" "${_option_INCLUDE_SYSTEM_FLAG}" _option_INCLUDE_DIRECTORIES _option_SYSTEM_INCLUDE_DIRECTORIES)
-	cotire_add_frameworks_to_cmd(_cmd "${_option_LANGUAGE}" ${_option_INCLUDE_DIRECTORIES})
-	cotire_add_makedep_flags("${_option_LANGUAGE}" "${_option_COMPILER_ID}" "${_option_COMPILER_VERSION}" _cmd)
-	# only consider existing source files for scanning
-	set (_existingSourceFiles "")
-	foreach (_sourceFile ${_sourceFiles})
-		if (EXISTS "${_sourceFile}")
-			list (APPEND _existingSourceFiles "${_sourceFile}")
-		endif()
-	endforeach()
-	if (NOT _existingSourceFiles)
-		set (${_includesVar} "" PARENT_SCOPE)
-		return()
-	endif()
-	list (APPEND _cmd ${_existingSourceFiles})
-	if (COTIRE_VERBOSE)
-		message (STATUS "execute_process: ${_cmd}")
-	endif()
-	if (_option_COMPILER_ID MATCHES "MSVC")
-		# cl.exe messes with the output streams unless the environment variable VS_UNICODE_OUTPUT is cleared
-		unset (ENV{VS_UNICODE_OUTPUT})
-	endif()
-	execute_process(
-		COMMAND ${_cmd}
-		WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
-		RESULT_VARIABLE _result
-		OUTPUT_QUIET
-		ERROR_VARIABLE _output)
-	if (_result)
-		message (STATUS "Result ${_result} scanning includes of ${_existingSourceFiles}.")
-	endif()
-	cotire_parse_includes(
-		"${_option_LANGUAGE}" "${_output}"
-		"${_option_IGNORE_PATH}" "${_option_INCLUDE_PATH}"
-		"${_option_IGNORE_EXTENSIONS}"
-		_includes _unparsedLines
-		${_sourceFiles})
-	if (_option_INCLUDE_PRIORITY_PATH)
-		set (_sortedIncludes "")
-		foreach (_priorityPath ${_option_INCLUDE_PRIORITY_PATH})
-			foreach (_include ${_includes})
-				string (FIND ${_include} ${_priorityPath} _position)
-				if (_position GREATER -1)
-					list (APPEND _sortedIncludes ${_include})
-				endif()
-			endforeach()
-		endforeach()
-		if (_sortedIncludes)
-			list (INSERT _includes 0 ${_sortedIncludes})
-			list (REMOVE_DUPLICATES _includes)
-		endif()
-	endif()
-	set (${_includesVar} ${_includes} PARENT_SCOPE)
-	if (_option_UNPARSED_LINES)
-		set (${_option_UNPARSED_LINES} ${_unparsedLines} PARENT_SCOPE)
-	endif()
-endfunction()
-
-macro (cotire_append_undefs _contentsVar)
-	set (_undefs ${ARGN})
-	if (_undefs)
-		list (REMOVE_DUPLICATES _undefs)
-		foreach (_definition ${_undefs})
-			list (APPEND ${_contentsVar} "#undef ${_definition}")
-		endforeach()
-	endif()
+function (cotire_write_file _language _file _contents _force)
+    get_filename_component(_moduleName "${COTIRE_CMAKE_MODULE_FILE}" NAME)
+    cotire_comment_str("${_language}" "${_moduleName} ${COTIRE_CMAKE_MODULE_VERSION} generated file" _header1)
+    cotire_comment_str("${_language}" "${_file}" _header2)
+    set (_contents "${_header1}\n${_header2}\n${_contents}")
+    if (COTIRE_DEBUG)
+        message (STATUS "${_contents}")
+    endif()
+    if (_force OR NOT EXISTS "${_file}")
+        file (WRITE "${_file}" "${_contents}")
+    else()
+        file (READ "${_file}" _oldContents)
+        if (NOT "${_oldContents}" STREQUAL "${_contents}")
+            file (WRITE "${_file}" "${_contents}")
+        else()
+            if (COTIRE_DEBUG)
+                message (STATUS "${_file} unchanged")
+            endif()
+        endif()
+    endif()
+endfunction()
+
+function (cotire_generate_unity_source _unityFile)
+    set(_options "")
+    set(_oneValueArgs LANGUAGE)
+    set(_multiValueArgs
+        DEPENDS SOURCES_COMPILE_DEFINITIONS
+        PRE_UNDEFS SOURCES_PRE_UNDEFS POST_UNDEFS SOURCES_POST_UNDEFS PROLOGUE EPILOGUE)
+    cmake_parse_arguments(_option "${_options}" "${_oneValueArgs}" "${_multiValueArgs}" ${ARGN})
+    if (_option_DEPENDS)
+        cotire_check_file_up_to_date(_unityFileIsUpToDate "${_unityFile}" ${_option_DEPENDS})
+        if (_unityFileIsUpToDate)
+            return()
+        endif()
+    endif()
+    set (_sourceFiles ${_option_UNPARSED_ARGUMENTS})
+    if (NOT _option_PRE_UNDEFS)
+        set (_option_PRE_UNDEFS "")
+    endif()
+    if (NOT _option_SOURCES_PRE_UNDEFS)
+        set (_option_SOURCES_PRE_UNDEFS "")
+    endif()
+    if (NOT _option_POST_UNDEFS)
+        set (_option_POST_UNDEFS "")
+    endif()
+    if (NOT _option_SOURCES_POST_UNDEFS)
+        set (_option_SOURCES_POST_UNDEFS "")
+    endif()
+    set (_contents "")
+    if (_option_PROLOGUE)
+        list (APPEND _contents ${_option_PROLOGUE})
+    endif()
+    if (_option_LANGUAGE AND _sourceFiles)
+        if ("${_option_LANGUAGE}" STREQUAL "CXX")
+            list (APPEND _contents "#ifdef __cplusplus")
+        elseif ("${_option_LANGUAGE}" STREQUAL "C")
+            list (APPEND _contents "#ifndef __cplusplus")
+        endif()
+    endif()
+    set (_compileUndefinitions "")
+    foreach (_sourceFile ${_sourceFiles})
+        cotire_get_source_compile_definitions(
+            "${_option_CONFIGURATION}" "${_option_LANGUAGE}" "${_sourceFile}" _compileDefinitions
+            ${_option_SOURCES_COMPILE_DEFINITIONS})
+        cotire_get_source_undefs("${_sourceFile}" COTIRE_UNITY_SOURCE_PRE_UNDEFS _sourcePreUndefs ${_option_SOURCES_PRE_UNDEFS})
+        cotire_get_source_undefs("${_sourceFile}" COTIRE_UNITY_SOURCE_POST_UNDEFS _sourcePostUndefs ${_option_SOURCES_POST_UNDEFS})
+        if (_option_PRE_UNDEFS)
+            list (APPEND _compileUndefinitions ${_option_PRE_UNDEFS})
+        endif()
+        if (_sourcePreUndefs)
+            list (APPEND _compileUndefinitions ${_sourcePreUndefs})
+        endif()
+        if (_compileUndefinitions)
+            cotire_append_undefs(_contents ${_compileUndefinitions})
+            set (_compileUndefinitions "")
+        endif()
+        if (_sourcePostUndefs)
+            list (APPEND _compileUndefinitions ${_sourcePostUndefs})
+        endif()
+        if (_option_POST_UNDEFS)
+            list (APPEND _compileUndefinitions ${_option_POST_UNDEFS})
+        endif()
+        foreach (_definition ${_compileDefinitions})
+            if (_definition MATCHES "^([a-zA-Z0-9_]+)=(.+)$")
+                list (APPEND _contents "#define ${CMAKE_MATCH_1} ${CMAKE_MATCH_2}")
+                list (INSERT _compileUndefinitions 0 "${CMAKE_MATCH_1}")
+            else()
+                list (APPEND _contents "#define ${_definition}")
+                list (INSERT _compileUndefinitions 0 "${_definition}")
+            endif()
+        endforeach()
+        # use absolute path as source file location
+        get_filename_component(_sourceFileLocation "${_sourceFile}" ABSOLUTE)
+        if (WIN32)
+            file (TO_NATIVE_PATH "${_sourceFileLocation}" _sourceFileLocation)
+        endif()
+        list (APPEND _contents "#include \"${_sourceFileLocation}\"")
+    endforeach()
+    if (_compileUndefinitions)
+        cotire_append_undefs(_contents ${_compileUndefinitions})
+        set (_compileUndefinitions "")
+    endif()
+    if (_option_LANGUAGE AND _sourceFiles)
+        list (APPEND _contents "#endif")
+    endif()
+    if (_option_EPILOGUE)
+        list (APPEND _contents ${_option_EPILOGUE})
+    endif()
+    list (APPEND _contents "")
+    string (REPLACE ";" "\n" _contents "${_contents}")
+    if (COTIRE_VERBOSE)
+        message ("${_contents}")
+    endif()
+    cotire_write_file("${_option_LANGUAGE}" "${_unityFile}" "${_contents}" TRUE)
+endfunction()
+
+function (cotire_generate_prefix_header _prefixFile)
+    set(_options "")
+    set(_oneValueArgs LANGUAGE COMPILER_EXECUTABLE COMPILER_ID COMPILER_VERSION)
+    set(_multiValueArgs DEPENDS COMPILE_DEFINITIONS COMPILE_FLAGS
+        INCLUDE_DIRECTORIES SYSTEM_INCLUDE_DIRECTORIES IGNORE_PATH INCLUDE_PATH
+        IGNORE_EXTENSIONS INCLUDE_PRIORITY_PATH)
+    cmake_parse_arguments(_option "${_options}" "${_oneValueArgs}" "${_multiValueArgs}" ${ARGN})
+    if (NOT _option_COMPILER_ID)
+        set (_option_COMPILER_ID "${CMAKE_${_option_LANGUAGE}_ID}")
+    endif()
+    if (NOT _option_COMPILER_VERSION)
+        set (_option_COMPILER_VERSION "${CMAKE_${_option_LANGUAGE}_COMPILER_VERSION}")
+    endif()
+    if (_option_DEPENDS)
+        cotire_check_file_up_to_date(_prefixFileIsUpToDate "${_prefixFile}" ${_option_DEPENDS})
+        if (_prefixFileIsUpToDate)
+            # create empty log file
+            set (_unparsedLinesFile "${_prefixFile}.log")
+            file (WRITE "${_unparsedLinesFile}" "")
+            return()
+        endif()
+    endif()
+    set (_prologue "")
+    set (_epilogue "")
+    if (_option_COMPILER_ID MATCHES "Clang")
+        set (_prologue "#pragma clang system_header")
+    elseif (_option_COMPILER_ID MATCHES "GNU")
+        set (_prologue "#pragma GCC system_header")
+    elseif (_option_COMPILER_ID MATCHES "MSVC")
+        set (_prologue "#pragma warning(push, 0)")
+        set (_epilogue "#pragma warning(pop)")
+    elseif (_option_COMPILER_ID MATCHES "Intel")
+        # Intel compiler requires hdrstop pragma to stop generating PCH file
+        set (_epilogue "#pragma hdrstop")
+    endif()
+    set (_sourceFiles ${_option_UNPARSED_ARGUMENTS})
+    cotire_scan_includes(_selectedHeaders ${_sourceFiles}
+        LANGUAGE "${_option_LANGUAGE}"
+        COMPILER_EXECUTABLE "${_option_COMPILER_EXECUTABLE}"
+        COMPILER_ID "${_option_COMPILER_ID}"
+        COMPILER_VERSION "${_option_COMPILER_VERSION}"
+        COMPILE_DEFINITIONS ${_option_COMPILE_DEFINITIONS}
+        COMPILE_FLAGS ${_option_COMPILE_FLAGS}
+        INCLUDE_DIRECTORIES ${_option_INCLUDE_DIRECTORIES}
+        SYSTEM_INCLUDE_DIRECTORIES ${_option_SYSTEM_INCLUDE_DIRECTORIES}
+        IGNORE_PATH ${_option_IGNORE_PATH}
+        INCLUDE_PATH ${_option_INCLUDE_PATH}
+        IGNORE_EXTENSIONS ${_option_IGNORE_EXTENSIONS}
+        INCLUDE_PRIORITY_PATH ${_option_INCLUDE_PRIORITY_PATH}
+        UNPARSED_LINES _unparsedLines)
+    cotire_generate_unity_source("${_prefixFile}"
+        PROLOGUE ${_prologue} EPILOGUE ${_epilogue} LANGUAGE "${_option_LANGUAGE}" ${_selectedHeaders})
+    set (_unparsedLinesFile "${_prefixFile}.log")
+    if (_unparsedLines)
+        if (COTIRE_VERBOSE OR NOT _selectedHeaders)
+            list (LENGTH _unparsedLines _skippedLineCount)
+            message (STATUS "${_skippedLineCount} line(s) skipped, see ${_unparsedLinesFile}")
+        endif()
+        string (REPLACE ";" "\n" _unparsedLines "${_unparsedLines}")
+    endif()
+    file (WRITE "${_unparsedLinesFile}" "${_unparsedLines}")
+endfunction()
+
+function (cotire_add_makedep_flags _language _compilerID _compilerVersion _flagsVar)
+    set (_flags ${${_flagsVar}})
+    if (_compilerID MATCHES "MSVC")
+        # cl.exe options used
+        # /nologo suppresses display of sign-on banner
+        # /TC treat all files named on the command line as C source files
+        # /TP treat all files named on the command line as C++ source files
+        # /EP preprocess to stdout without #line directives
+        # /showIncludes list include files
+        set (_sourceFileTypeC "/TC")
+        set (_sourceFileTypeCXX "/TP")
+        if (_flags)
+            # append to list
+            list (APPEND _flags /nologo "${_sourceFileType${_language}}" /EP /showIncludes)
+        else()
+            # return as a flag string
+            set (_flags "${_sourceFileType${_language}} /EP /showIncludes")
+        endif()
+    elseif (_compilerID MATCHES "GNU")
+        # GCC options used
+        # -H print the name of each header file used
+        # -E invoke preprocessor
+        # -fdirectives-only do not expand macros, requires GCC >= 4.3
+        if (_flags)
+            # append to list
+            list (APPEND _flags -H -E)
+            if (NOT "${_compilerVersion}" VERSION_LESS "4.3.0")
+                list (APPEND _flags "-fdirectives-only")
+            endif()
+        else()
+            # return as a flag string
+            set (_flags "-H -E")
+            if (NOT "${_compilerVersion}" VERSION_LESS "4.3.0")
+                set (_flags "${_flags} -fdirectives-only")
+            endif()
+        endif()
+    elseif (_compilerID MATCHES "Clang")
+        # Clang options used
+        # -H print the name of each header file used
+        # -E invoke preprocessor
+        # -fno-color-diagnostics don't prints diagnostics in color
+        if (_flags)
+            # append to list
+            list (APPEND _flags -H -E -fno-color-diagnostics)
+        else()
+            # return as a flag string
+            set (_flags "-H -E -fno-color-diagnostics")
+        endif()
+    elseif (_compilerID MATCHES "Intel")
+        if (WIN32)
+            # Windows Intel options used
+            # /nologo do not display compiler version information
+            # /QH display the include file order
+            # /EP preprocess to stdout, omitting #line directives
+            # /TC process all source or unrecognized file types as C source files
+            # /TP process all source or unrecognized file types as C++ source files
+            set (_sourceFileTypeC "/TC")
+            set (_sourceFileTypeCXX "/TP")
+            if (_flags)
+                # append to list
+                list (APPEND _flags /nologo "${_sourceFileType${_language}}" /EP /QH)
+            else()
+                # return as a flag string
+                set (_flags "${_sourceFileType${_language}} /EP /QH")
+            endif()
+        else()
+            # Linux / Mac OS X Intel options used
+            # -H print the name of each header file used
+            # -EP preprocess to stdout, omitting #line directives
+            # -Kc++ process all source or unrecognized file types as C++ source files
+            if (_flags)
+                # append to list
+                if ("${_language}" STREQUAL "CXX")
+                    list (APPEND _flags -Kc++)
+                endif()
+                list (APPEND _flags -H -EP)
+            else()
+                # return as a flag string
+                if ("${_language}" STREQUAL "CXX")
+                    set (_flags "-Kc++ ")
+                endif()
+                set (_flags "${_flags}-H -EP")
+            endif()
+        endif()
+    else()
+        message (FATAL_ERROR "cotire: unsupported ${_language} compiler ${_compilerID} version ${_compilerVersion}.")
+    endif()
+    set (${_flagsVar} ${_flags} PARENT_SCOPE)
+endfunction()
+
+function (cotire_add_pch_compilation_flags _language _compilerID _compilerVersion _prefixFile _pchFile _hostFile _flagsVar)
+    set (_flags ${${_flagsVar}})
+    if (_compilerID MATCHES "MSVC")
+        file (TO_NATIVE_PATH "${_prefixFile}" _prefixFileNative)
+        file (TO_NATIVE_PATH "${_pchFile}" _pchFileNative)
+        file (TO_NATIVE_PATH "${_hostFile}" _hostFileNative)
+        # cl.exe options used
+        # /Yc creates a precompiled header file
+        # /Fp specifies precompiled header binary file name
+        # /FI forces inclusion of file
+        # /TC treat all files named on the command line as C source files
+        # /TP treat all files named on the command line as C++ source files
+        # /Zs syntax check only
+        # /Zm precompiled header memory allocation scaling factor
+        set (_sourceFileTypeC "/TC")
+        set (_sourceFileTypeCXX "/TP")
+        if (_flags)
+            # append to list
+            list (APPEND _flags /nologo "${_sourceFileType${_language}}"
+                "/Yc${_prefixFileNative}" "/Fp${_pchFileNative}" "/FI${_prefixFileNative}" /Zs "${_hostFileNative}")
+            if (COTIRE_PCH_MEMORY_SCALING_FACTOR)
+                list (APPEND _flags "/Zm${COTIRE_PCH_MEMORY_SCALING_FACTOR}")
+            endif()
+        else()
+            # return as a flag string
+            set (_flags "/Yc\"${_prefixFileNative}\" /Fp\"${_pchFileNative}\" /FI\"${_prefixFileNative}\"")
+            if (COTIRE_PCH_MEMORY_SCALING_FACTOR)
+                set (_flags "${_flags} /Zm${COTIRE_PCH_MEMORY_SCALING_FACTOR}")
+            endif()
+        endif()
+    elseif (_compilerID MATCHES "GNU|Clang")
+        # GCC / Clang options used
+        # -x specify the source language
+        # -c compile but do not link
+        # -o place output in file
+        # note that we cannot use -w to suppress all warnings upon pre-compiling, because turning off a warning may
+        # alter compile flags as a side effect (e.g., -Wwrite-string implies -fconst-strings)
+        set (_xLanguage_C "c-header")
+        set (_xLanguage_CXX "c++-header")
+        if (_flags)
+            # append to list
+            list (APPEND _flags "-x" "${_xLanguage_${_language}}" "-c" "${_prefixFile}" -o "${_pchFile}")
+        else()
+            # return as a flag string
+            set (_flags "-x ${_xLanguage_${_language}} -c \"${_prefixFile}\" -o \"${_pchFile}\"")
+        endif()
+    elseif (_compilerID MATCHES "Intel")
+        if (WIN32)
+            file (TO_NATIVE_PATH "${_prefixFile}" _prefixFileNative)
+            file (TO_NATIVE_PATH "${_pchFile}" _pchFileNative)
+            file (TO_NATIVE_PATH "${_hostFile}" _hostFileNative)
+            # Windows Intel options used
+            # /nologo do not display compiler version information
+            # /Yc create a precompiled header (PCH) file
+            # /Fp specify a path or file name for precompiled header files
+            # /FI tells the preprocessor to include a specified file name as the header file
+            # /TC process all source or unrecognized file types as C source files
+            # /TP process all source or unrecognized file types as C++ source files
+            # /Zs syntax check only
+            # /Wpch-messages enable diagnostics related to pre-compiled headers (requires Intel XE 2013 Update 2)
+            set (_sourceFileTypeC "/TC")
+            set (_sourceFileTypeCXX "/TP")
+            if (_flags)
+                # append to list
+                list (APPEND _flags /nologo "${_sourceFileType${_language}}"
+                    "/Yc" "/Fp${_pchFileNative}" "/FI${_prefixFileNative}" /Zs "${_hostFileNative}")
+                if (NOT "${_compilerVersion}" VERSION_LESS "13.1.0")
+                    list (APPEND _flags "/Wpch-messages")
+                endif()
+            else()
+                # return as a flag string
+                set (_flags "/Yc /Fp\"${_pchFileNative}\" /FI\"${_prefixFileNative}\"")
+                if (NOT "${_compilerVersion}" VERSION_LESS "13.1.0")
+                    set (_flags "${_flags} /Wpch-messages")
+                endif()
+            endif()
+        else()
+            # Linux / Mac OS X Intel options used
+            # -pch-dir location for precompiled header files
+            # -pch-create name of the precompiled header (PCH) to create
+            # -Kc++ process all source or unrecognized file types as C++ source files
+            # -fsyntax-only check only for correct syntax
+            # -Wpch-messages enable diagnostics related to pre-compiled headers (requires Intel XE 2013 Update 2)
+            get_filename_component(_pchDir "${_pchFile}" DIRECTORY)
+            get_filename_component(_pchName "${_pchFile}" NAME)
+            set (_xLanguage_C "c-header")
+            set (_xLanguage_CXX "c++-header")
+            if (_flags)
+                # append to list
+                if ("${_language}" STREQUAL "CXX")
+                    list (APPEND _flags -Kc++)
+                endif()
+                list (APPEND _flags "-include" "${_prefixFile}" "-pch-dir" "${_pchDir}" "-pch-create" "${_pchName}" "-fsyntax-only" "${_hostFile}")
+                if (NOT "${_compilerVersion}" VERSION_LESS "13.1.0")
+                    list (APPEND _flags "-Wpch-messages")
+                endif()
+            else()
+                # return as a flag string
+                set (_flags "-include \"${_prefixFile}\" -pch-dir \"${_pchDir}\" -pch-create \"${_pchName}\"")
+                if (NOT "${_compilerVersion}" VERSION_LESS "13.1.0")
+                    set (_flags "${_flags} -Wpch-messages")
+                endif()
+            endif()
+        endif()
+    else()
+        message (FATAL_ERROR "cotire: unsupported ${_language} compiler ${_compilerID} version ${_compilerVersion}.")
+    endif()
+    set (${_flagsVar} ${_flags} PARENT_SCOPE)
+endfunction()
+
+function (cotire_add_prefix_pch_inclusion_flags _language _compilerID _compilerVersion _prefixFile _pchFile _flagsVar)
+    set (_flags ${${_flagsVar}})
+    if (_compilerID MATCHES "MSVC")
+        file (TO_NATIVE_PATH "${_prefixFile}" _prefixFileNative)
+        # cl.exe options used
+        # /Yu uses a precompiled header file during build
+        # /Fp specifies precompiled header binary file name
+        # /FI forces inclusion of file
+        # /Zm precompiled header memory allocation scaling factor
+        if (_pchFile)
+            file (TO_NATIVE_PATH "${_pchFile}" _pchFileNative)
+            if (_flags)
+                # append to list
+                list (APPEND _flags "/Yu${_prefixFileNative}" "/Fp${_pchFileNative}" "/FI${_prefixFileNative}")
+                if (COTIRE_PCH_MEMORY_SCALING_FACTOR)
+                    list (APPEND _flags "/Zm${COTIRE_PCH_MEMORY_SCALING_FACTOR}")
+                endif()
+            else()
+                # return as a flag string
+                set (_flags "/Yu\"${_prefixFileNative}\" /Fp\"${_pchFileNative}\" /FI\"${_prefixFileNative}\"")
+                if (COTIRE_PCH_MEMORY_SCALING_FACTOR)
+                    set (_flags "${_flags} /Zm${COTIRE_PCH_MEMORY_SCALING_FACTOR}")
+                endif()
+            endif()
+        else()
+            # no precompiled header, force inclusion of prefix header
+            if (_flags)
+                # append to list
+                list (APPEND _flags "/FI${_prefixFileNative}")
+            else()
+                # return as a flag string
+                set (_flags "/FI\"${_prefixFileNative}\"")
+            endif()
+        endif()
+    elseif (_compilerID MATCHES "GNU")
+        # GCC options used
+        # -include process include file as the first line of the primary source file
+        # -Winvalid-pch warns if precompiled header is found but cannot be used
+        # note: ccache requires the -include flag to be used in order to process precompiled header correctly
+        if (_flags)
+            # append to list
+            list (APPEND _flags "-Winvalid-pch" "-include" "${_prefixFile}")
+        else()
+            # return as a flag string
+            set (_flags "-Winvalid-pch -include \"${_prefixFile}\"")
+        endif()
+    elseif (_compilerID MATCHES "Clang")
+        # Clang options used
+        # -include process include file as the first line of the primary source file
+        # -include-pch include precompiled header file
+        # -Qunused-arguments don't emit warning for unused driver arguments
+        # note: ccache requires the -include flag to be used in order to process precompiled header correctly
+        if (_flags)
+            # append to list
+            list (APPEND _flags "-Qunused-arguments" "-include" "${_prefixFile}")
+        else()
+            # return as a flag string
+            set (_flags "-Qunused-arguments -include \"${_prefixFile}\"")
+        endif()
+    elseif (_compilerID MATCHES "Intel")
+        if (WIN32)
+            file (TO_NATIVE_PATH "${_prefixFile}" _prefixFileNative)
+            # Windows Intel options used
+            # /Yu use a precompiled header (PCH) file
+            # /Fp specify a path or file name for precompiled header files
+            # /FI tells the preprocessor to include a specified file name as the header file
+            # /Wpch-messages enable diagnostics related to pre-compiled headers (requires Intel XE 2013 Update 2)
+            if (_pchFile)
+                file (TO_NATIVE_PATH "${_pchFile}" _pchFileNative)
+                if (_flags)
+                    # append to list
+                    list (APPEND _flags "/Yu" "/Fp${_pchFileNative}" "/FI${_prefixFileNative}")
+                    if (NOT "${_compilerVersion}" VERSION_LESS "13.1.0")
+                        list (APPEND _flags "/Wpch-messages")
+                    endif()
+                else()
+                    # return as a flag string
+                    set (_flags "/Yu /Fp\"${_pchFileNative}\" /FI\"${_prefixFileNative}\"")
+                    if (NOT "${_compilerVersion}" VERSION_LESS "13.1.0")
+                        set (_flags "${_flags} /Wpch-messages")
+                    endif()
+                endif()
+            else()
+                # no precompiled header, force inclusion of prefix header
+                if (_flags)
+                    # append to list
+                    list (APPEND _flags "/FI${_prefixFileNative}")
+                else()
+                    # return as a flag string
+                    set (_flags "/FI\"${_prefixFileNative}\"")
+                endif()
+            endif()
+        else()
+            # Linux / Mac OS X Intel options used
+            # -pch-dir location for precompiled header files
+            # -pch-use name of the precompiled header (PCH) to use
+            # -include process include file as the first line of the primary source file
+            # -Wpch-messages enable diagnostics related to pre-compiled headers (requires Intel XE 2013 Update 2)
+            if (_pchFile)
+                get_filename_component(_pchDir "${_pchFile}" DIRECTORY)
+                get_filename_component(_pchName "${_pchFile}" NAME)
+                if (_flags)
+                    # append to list
+                    list (APPEND _flags "-include" "${_prefixFile}" "-pch-dir" "${_pchDir}" "-pch-use" "${_pchName}")
+                    if (NOT "${_compilerVersion}" VERSION_LESS "13.1.0")
+                        list (APPEND _flags "-Wpch-messages")
+                    endif()
+                else()
+                    # return as a flag string
+                    set (_flags "-include \"${_prefixFile}\" -pch-dir \"${_pchDir}\" -pch-use \"${_pchName}\"")
+                    if (NOT "${_compilerVersion}" VERSION_LESS "13.1.0")
+                        set (_flags "${_flags} -Wpch-messages")
+                    endif()
+                endif()
+            else()
+                # no precompiled header, force inclusion of prefix header
+                if (_flags)
+                    # append to list
+                    list (APPEND _flags "-include" "${_prefixFile}")
+                else()
+                    # return as a flag string
+                    set (_flags "-include \"${_prefixFile}\"")
+                endif()
+            endif()
+        endif()
+    else()
+        message (FATAL_ERROR "cotire: unsupported ${_language} compiler ${_compilerID} version ${_compilerVersion}.")
+    endif()
+    set (${_flagsVar} ${_flags} PARENT_SCOPE)
+endfunction()
+
+function (cotire_precompile_prefix_header _prefixFile _pchFile _hostFile)
+    set(_options "")
+    set(_oneValueArgs COMPILER_EXECUTABLE COMPILER_ID COMPILER_VERSION LANGUAGE)
+    set(_multiValueArgs COMPILE_DEFINITIONS COMPILE_FLAGS INCLUDE_DIRECTORIES SYSTEM_INCLUDE_DIRECTORIES SYS)
+    cmake_parse_arguments(_option "${_options}" "${_oneValueArgs}" "${_multiValueArgs}" ${ARGN})
+    if (NOT _option_LANGUAGE)
+        set (_option_LANGUAGE "CXX")
+    endif()
+    if (NOT _option_COMPILER_ID)
+        set (_option_COMPILER_ID "${CMAKE_${_option_LANGUAGE}_ID}")
+    endif()
+    if (NOT _option_COMPILER_VERSION)
+        set (_option_COMPILER_VERSION "${CMAKE_${_option_LANGUAGE}_COMPILER_VERSION}")
+    endif()
+    cotire_init_compile_cmd(_cmd "${_option_LANGUAGE}" "${_option_COMPILER_EXECUTABLE}" "${_option_COMPILER_ARG1}")
+    cotire_add_definitions_to_cmd(_cmd "${_option_LANGUAGE}" ${_option_COMPILE_DEFINITIONS})
+    cotire_add_compile_flags_to_cmd(_cmd ${_option_COMPILE_FLAGS})
+    cotire_add_includes_to_cmd(_cmd "${_option_LANGUAGE}" _option_INCLUDE_DIRECTORIES _option_SYSTEM_INCLUDE_DIRECTORIES)
+    cotire_add_frameworks_to_cmd(_cmd "${_option_LANGUAGE}" _option_INCLUDE_DIRECTORIES _option_SYSTEM_INCLUDE_DIRECTORIES)
+    cotire_add_pch_compilation_flags(
+        "${_option_LANGUAGE}" "${_option_COMPILER_ID}" "${_option_COMPILER_VERSION}"
+        "${_prefixFile}" "${_pchFile}" "${_hostFile}" _cmd)
+    if (COTIRE_VERBOSE)
+        message (STATUS "execute_process: ${_cmd}")
+    endif()
+    if (_option_COMPILER_ID MATCHES "MSVC")
+        # cl.exe messes with the output streams unless the environment variable VS_UNICODE_OUTPUT is cleared
+        unset (ENV{VS_UNICODE_OUTPUT})
+    endif()
+    execute_process(
+        COMMAND ${_cmd}
+        WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
+        RESULT_VARIABLE _result)
+    if (_result)
+        message (FATAL_ERROR "cotire: error ${_result} precompiling ${_prefixFile}.")
+    endif()
+endfunction()
+
+function (cotire_check_precompiled_header_support _language _target _msgVar)
+    set (_unsupportedCompiler
+        "Precompiled headers not supported for ${_language} compiler ${CMAKE_${_language}_COMPILER_ID}")
+    if (CMAKE_${_language}_COMPILER_ID MATCHES "MSVC")
+        # supported since Visual Studio C++ 6.0
+        # and CMake does not support an earlier version
+        set (${_msgVar} "" PARENT_SCOPE)
+    elseif (CMAKE_${_language}_COMPILER_ID MATCHES "GNU")
+        # GCC PCH support requires version >= 3.4
+        if ("${CMAKE_${_language}_COMPILER_VERSION}" VERSION_LESS "3.4.0")
+            set (${_msgVar} "${_unsupportedCompiler} version ${CMAKE_${_language}_COMPILER_VERSION}." PARENT_SCOPE)
+        else()
+            set (${_msgVar} "" PARENT_SCOPE)
+        endif()
+    elseif (CMAKE_${_language}_COMPILER_ID MATCHES "Clang")
+        # all Clang versions have PCH support
+        set (${_msgVar} "" PARENT_SCOPE)
+    elseif (CMAKE_${_language}_COMPILER_ID MATCHES "Intel")
+        # Intel PCH support requires version >= 8.0.0
+        if ("${CMAKE_${_language}_COMPILER_VERSION}" VERSION_LESS "8.0.0")
+            set (${_msgVar} "${_unsupportedCompiler} version ${CMAKE_${_language}_COMPILER_VERSION}." PARENT_SCOPE)
+        else()
+            set (${_msgVar} "" PARENT_SCOPE)
+        endif()
+    else()
+        set (${_msgVar} "${_unsupportedCompiler}." PARENT_SCOPE)
+    endif()
+    if (CMAKE_${_language}_COMPILER MATCHES "ccache")
+        if (NOT "$ENV{CCACHE_SLOPPINESS}" MATCHES "time_macros|pch_defines")
+            set (${_msgVar}
+                "ccache requires the environment variable CCACHE_SLOPPINESS to be set to \"pch_defines,time_macros\"."
+                PARENT_SCOPE)
+        endif()
+    endif()
+    if (APPLE)
+        # PCH compilation not supported by GCC / Clang for multi-architecture builds (e.g., i386, x86_64)
+        cotire_get_configuration_types(_configs)
+        foreach (_config ${_configs})
+            set (_targetFlags "")
+            cotire_get_target_compile_flags("${_config}" "${_language}" "${_target}" _targetFlags)
+            cotire_filter_compile_flags("${_language}" "arch" _architectures _ignore ${_targetFlags})
+            list (LENGTH _architectures _numberOfArchitectures)
+            if (_numberOfArchitectures GREATER 1)
+                string (REPLACE ";" ", " _architectureStr "${_architectures}")
+                set (${_msgVar}
+                    "Precompiled headers not supported on Darwin for multi-architecture builds (${_architectureStr})."
+                    PARENT_SCOPE)
+                break()
+            endif()
+        endforeach()
+    endif()
+endfunction()
+
+macro (cotire_get_intermediate_dir _cotireDir)
+    # ${CMAKE_CFG_INTDIR} may reference a build-time variable when using a generator which supports configuration types
+    get_filename_component(${_cotireDir} "${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/${COTIRE_INTDIR}" ABSOLUTE)
 endmacro()

-macro (cotire_comment_str _language _commentText _commentVar)
-	if ("${_language}" STREQUAL "CMAKE")
-		set (${_commentVar} "# ${_commentText}")
-	else()
-		set (${_commentVar} "/* ${_commentText} */")
-	endif()
+macro (cotire_setup_file_extension_variables)
+    set (_unityFileExt_C ".c")
+    set (_unityFileExt_CXX ".cxx")
+    set (_prefixFileExt_C ".h")
+    set (_prefixFileExt_CXX ".hxx")
+    set (_prefixSourceFileExt_C ".c")
+    set (_prefixSourceFileExt_CXX ".cxx")
 endmacro()

-function (cotire_write_file _language _file _contents _force)
-	get_filename_component(_moduleName "${COTIRE_CMAKE_MODULE_FILE}" NAME)
-	cotire_comment_str("${_language}" "${_moduleName} ${COTIRE_CMAKE_MODULE_VERSION} generated file" _header1)
-	cotire_comment_str("${_language}" "${_file}" _header2)
-	set (_contents "${_header1}\n${_header2}\n${_contents}")
-	if (COTIRE_DEBUG)
-		message (STATUS "${_contents}")
-	endif()
-	if (_force OR NOT EXISTS "${_file}")
-		file (WRITE "${_file}" "${_contents}")
-	else()
-		file (READ "${_file}" _oldContents)
-		if (NOT "${_oldContents}" STREQUAL "${_contents}")
-			file (WRITE "${_file}" "${_contents}")
-		else()
-			if (COTIRE_DEBUG)
-				message (STATUS "${_file} unchanged")
-			endif()
-		endif()
-	endif()
-endfunction()
-
-function (cotire_generate_unity_source _unityFile)
-	set(_options "")
-	set(_oneValueArgs LANGUAGE)
-	set(_multiValueArgs
-		DEPENDS SOURCES_COMPILE_DEFINITIONS
-		PRE_UNDEFS SOURCES_PRE_UNDEFS POST_UNDEFS SOURCES_POST_UNDEFS PROLOGUE EPILOGUE)
-	cmake_parse_arguments(_option "${_options}" "${_oneValueArgs}" "${_multiValueArgs}" ${ARGN})
-	if (_option_DEPENDS)
-		cotire_check_file_up_to_date(_unityFileIsUpToDate "${_unityFile}" ${_option_DEPENDS})
-		if (_unityFileIsUpToDate)
-			return()
-		endif()
-	endif()
-	set (_sourceFiles ${_option_UNPARSED_ARGUMENTS})
-	if (NOT _option_PRE_UNDEFS)
-		set (_option_PRE_UNDEFS "")
-	endif()
-	if (NOT _option_SOURCES_PRE_UNDEFS)
-		set (_option_SOURCES_PRE_UNDEFS "")
-	endif()
-	if (NOT _option_POST_UNDEFS)
-		set (_option_POST_UNDEFS "")
-	endif()
-	if (NOT _option_SOURCES_POST_UNDEFS)
-		set (_option_SOURCES_POST_UNDEFS "")
-	endif()
-	set (_contents "")
-	if (_option_PROLOGUE)
-		list (APPEND _contents ${_option_PROLOGUE})
-	endif()
-	if (_option_LANGUAGE AND _sourceFiles)
-		if ("${_option_LANGUAGE}" STREQUAL "CXX")
-			list (APPEND _contents "#ifdef __cplusplus")
-		elseif ("${_option_LANGUAGE}" STREQUAL "C")
-			list (APPEND _contents "#ifndef __cplusplus")
-		endif()
-	endif()
-	set (_compileUndefinitions "")
-	foreach (_sourceFile ${_sourceFiles})
-		cotire_get_source_compile_definitions(
-			"${_option_CONFIGURATION}" "${_option_LANGUAGE}" "${_sourceFile}" _compileDefinitions
-			${_option_SOURCES_COMPILE_DEFINITIONS})
-		cotire_get_source_undefs("${_sourceFile}" COTIRE_UNITY_SOURCE_PRE_UNDEFS _sourcePreUndefs ${_option_SOURCES_PRE_UNDEFS})
-		cotire_get_source_undefs("${_sourceFile}" COTIRE_UNITY_SOURCE_POST_UNDEFS _sourcePostUndefs ${_option_SOURCES_POST_UNDEFS})
-		if (_option_PRE_UNDEFS)
-			list (APPEND _compileUndefinitions ${_option_PRE_UNDEFS})
-		endif()
-		if (_sourcePreUndefs)
-			list (APPEND _compileUndefinitions ${_sourcePreUndefs})
-		endif()
-		if (_compileUndefinitions)
-			cotire_append_undefs(_contents ${_compileUndefinitions})
-			set (_compileUndefinitions "")
-		endif()
-		if (_sourcePostUndefs)
-			list (APPEND _compileUndefinitions ${_sourcePostUndefs})
-		endif()
-		if (_option_POST_UNDEFS)
-			list (APPEND _compileUndefinitions ${_option_POST_UNDEFS})
-		endif()
-		foreach (_definition ${_compileDefinitions})
-			if (_definition MATCHES "^([a-zA-Z0-9_]+)=(.+)$")
-				list (APPEND _contents "#define ${CMAKE_MATCH_1} ${CMAKE_MATCH_2}")
-				list (INSERT _compileUndefinitions 0 "${CMAKE_MATCH_1}")
-			else()
-				list (APPEND _contents "#define ${_definition}")
-				list (INSERT _compileUndefinitions 0 "${_definition}")
-			endif()
-		endforeach()
-		# use absolute path as source file location
-		get_filename_component(_sourceFileLocation "${_sourceFile}" ABSOLUTE)
-		if (WIN32)
-			file (TO_NATIVE_PATH "${_sourceFileLocation}" _sourceFileLocation)
-		endif()
-		list (APPEND _contents "#include \"${_sourceFileLocation}\"")
-	endforeach()
-	if (_compileUndefinitions)
-		cotire_append_undefs(_contents ${_compileUndefinitions})
-		set (_compileUndefinitions "")
-	endif()
-	if (_option_LANGUAGE AND _sourceFiles)
-		list (APPEND _contents "#endif")
-	endif()
-	if (_option_EPILOGUE)
-		list (APPEND _contents ${_option_EPILOGUE})
-	endif()
-	list (APPEND _contents "")
-	string (REPLACE ";" "\n" _contents "${_contents}")
-	if (COTIRE_VERBOSE)
-		message ("${_contents}")
-	endif()
-	cotire_write_file("${_option_LANGUAGE}" "${_unityFile}" "${_contents}" TRUE)
-endfunction()
-
-function (cotire_generate_prefix_header _prefixFile)
-	set(_options "")
-	set(_oneValueArgs LANGUAGE COMPILER_EXECUTABLE COMPILER_ID COMPILER_VERSION INCLUDE_SYSTEM_FLAG)
-	set(_multiValueArgs DEPENDS COMPILE_DEFINITIONS COMPILE_FLAGS
-		INCLUDE_DIRECTORIES SYSTEM_INCLUDE_DIRECTORIES IGNORE_PATH INCLUDE_PATH
-		IGNORE_EXTENSIONS INCLUDE_PRIORITY_PATH)
-	cmake_parse_arguments(_option "${_options}" "${_oneValueArgs}" "${_multiValueArgs}" ${ARGN})
-	if (NOT _option_COMPILER_ID)
-		set (_option_COMPILER_ID "${CMAKE_${_option_LANGUAGE}_ID}")
-	endif()
-	if (NOT _option_COMPILER_VERSION)
-		set (_option_COMPILER_VERSION "${CMAKE_${_option_LANGUAGE}_COMPILER_VERSION}")
-	endif()
-	if (_option_DEPENDS)
-		cotire_check_file_up_to_date(_prefixFileIsUpToDate "${_prefixFile}" ${_option_DEPENDS})
-		if (_prefixFileIsUpToDate)
-			# create empty log file
-			set (_unparsedLinesFile "${_prefixFile}.log")
-			file (WRITE "${_unparsedLinesFile}" "")
-			return()
-		endif()
-	endif()
-	set (_prologue "")
-	set (_epilogue "")
-	if (_option_COMPILER_ID MATCHES "Clang")
-		set (_prologue "#pragma clang system_header")
-	elseif (_option_COMPILER_ID MATCHES "GNU")
-		set (_prologue "#pragma GCC system_header")
-	elseif (_option_COMPILER_ID MATCHES "MSVC")
-		set (_prologue "#pragma warning(push, 0)")
-		set (_epilogue "#pragma warning(pop)")
-	elseif (_option_COMPILER_ID MATCHES "Intel")
-		# Intel compiler requires hdrstop pragma to stop generating PCH file
-		set (_epilogue "#pragma hdrstop")
-	endif()
-	set (_sourceFiles ${_option_UNPARSED_ARGUMENTS})
-	cotire_scan_includes(_selectedHeaders ${_sourceFiles}
-		LANGUAGE "${_option_LANGUAGE}"
-		COMPILER_EXECUTABLE "${_option_COMPILER_EXECUTABLE}"
-		COMPILER_ID "${_option_COMPILER_ID}"
-		COMPILER_VERSION "${_option_COMPILER_VERSION}"
-		COMPILE_DEFINITIONS ${_option_COMPILE_DEFINITIONS}
-		COMPILE_FLAGS ${_option_COMPILE_FLAGS}
-		INCLUDE_DIRECTORIES ${_option_INCLUDE_DIRECTORIES}
-		INCLUDE_SYSTEM_FLAG ${_option_INCLUDE_SYSTEM_FLAG}
-		SYSTEM_INCLUDE_DIRECTORIES ${_option_SYSTEM_INCLUDE_DIRECTORIES}
-		IGNORE_PATH ${_option_IGNORE_PATH}
-		INCLUDE_PATH ${_option_INCLUDE_PATH}
-		IGNORE_EXTENSIONS ${_option_IGNORE_EXTENSIONS}
-		INCLUDE_PRIORITY_PATH ${_option_INCLUDE_PRIORITY_PATH}
-		UNPARSED_LINES _unparsedLines)
-	cotire_generate_unity_source("${_prefixFile}"
-		PROLOGUE ${_prologue} EPILOGUE ${_epilogue} LANGUAGE "${_option_LANGUAGE}" ${_selectedHeaders})
-	set (_unparsedLinesFile "${_prefixFile}.log")
-	if (_unparsedLines)
-		if (COTIRE_VERBOSE OR NOT _selectedHeaders)
-			list (LENGTH _unparsedLines _skippedLineCount)
-			message (STATUS "${_skippedLineCount} line(s) skipped, see ${_unparsedLinesFile}")
-		endif()
-		string (REPLACE ";" "\n" _unparsedLines "${_unparsedLines}")
-	endif()
-	file (WRITE "${_unparsedLinesFile}" "${_unparsedLines}")
-endfunction()
-
-function (cotire_add_makedep_flags _language _compilerID _compilerVersion _flagsVar)
-	set (_flags ${${_flagsVar}})
-	if (_compilerID MATCHES "MSVC")
-		# cl.exe options used
-		# /nologo suppresses display of sign-on banner
-		# /TC treat all files named on the command line as C source files
-		# /TP treat all files named on the command line as C++ source files
-		# /EP preprocess to stdout without #line directives
-		# /showIncludes list include files
-		set (_sourceFileTypeC "/TC")
-		set (_sourceFileTypeCXX "/TP")
-		if (_flags)
-			# append to list
-			list (APPEND _flags /nologo "${_sourceFileType${_language}}" /EP /showIncludes)
-		else()
-			# return as a flag string
-			set (_flags "${_sourceFileType${_language}} /EP /showIncludes")
-		endif()
-	elseif (_compilerID MATCHES "GNU")
-		# GCC options used
-		# -H print the name of each header file used
-		# -E invoke preprocessor
-		# -fdirectives-only do not expand macros, requires GCC >= 4.3
-		if (_flags)
-			# append to list
-			list (APPEND _flags -H -E)
-			if (NOT "${_compilerVersion}" VERSION_LESS "4.3.0")
-				list (APPEND _flags "-fdirectives-only")
-			endif()
-		else()
-			# return as a flag string
-			set (_flags "-H -E")
-			if (NOT "${_compilerVersion}" VERSION_LESS "4.3.0")
-				set (_flags "${_flags} -fdirectives-only")
-			endif()
-		endif()
-	elseif (_compilerID MATCHES "Clang")
-		# Clang options used
-		# -H print the name of each header file used
-		# -E invoke preprocessor
-		# -fno-color-diagnostics don't prints diagnostics in color
-		if (_flags)
-			# append to list
-			list (APPEND _flags -H -E -fno-color-diagnostics)
-		else()
-			# return as a flag string
-			set (_flags "-H -E -fno-color-diagnostics")
-		endif()
-	elseif (_compilerID MATCHES "Intel")
-		if (WIN32)
-			# Windows Intel options used
-			# /nologo do not display compiler version information
-			# /QH display the include file order
-			# /EP preprocess to stdout, omitting #line directives
-			# /TC process all source or unrecognized file types as C source files
-			# /TP process all source or unrecognized file types as C++ source files
-			set (_sourceFileTypeC "/TC")
-			set (_sourceFileTypeCXX "/TP")
-			if (_flags)
-				# append to list
-				list (APPEND _flags /nologo "${_sourceFileType${_language}}" /EP /QH)
-			else()
-				# return as a flag string
-				set (_flags "${_sourceFileType${_language}} /EP /QH")
-			endif()
-		else()
-			# Linux / Mac OS X Intel options used
-			# -H print the name of each header file used
-			# -EP preprocess to stdout, omitting #line directives
-			# -Kc++ process all source or unrecognized file types as C++ source files
-			if (_flags)
-				# append to list
-				if ("${_language}" STREQUAL "CXX")
-					list (APPEND _flags -Kc++)
-				endif()
-				list (APPEND _flags -H -EP)
-			else()
-				# return as a flag string
-				if ("${_language}" STREQUAL "CXX")
-					set (_flags "-Kc++ ")
-				endif()
-				set (_flags "${_flags}-H -EP")
-			endif()
-		endif()
-	else()
-		message (FATAL_ERROR "cotire: unsupported ${_language} compiler ${_compilerID} version ${_compilerVersion}.")
-	endif()
-	set (${_flagsVar} ${_flags} PARENT_SCOPE)
-endfunction()
-
-function (cotire_add_pch_compilation_flags _language _compilerID _compilerVersion _prefixFile _pchFile _hostFile _flagsVar)
-	set (_flags ${${_flagsVar}})
-	if (_compilerID MATCHES "MSVC")
-		file (TO_NATIVE_PATH "${_prefixFile}" _prefixFileNative)
-		file (TO_NATIVE_PATH "${_pchFile}" _pchFileNative)
-		file (TO_NATIVE_PATH "${_hostFile}" _hostFileNative)
-		# cl.exe options used
-		# /Yc creates a precompiled header file
-		# /Fp specifies precompiled header binary file name
-		# /FI forces inclusion of file
-		# /TC treat all files named on the command line as C source files
-		# /TP treat all files named on the command line as C++ source files
-		# /Zs syntax check only
-		# /Zm precompiled header memory allocation scaling factor
-		set (_sourceFileTypeC "/TC")
-		set (_sourceFileTypeCXX "/TP")
-		if (_flags)
-			# append to list
-			list (APPEND _flags /nologo "${_sourceFileType${_language}}"
-				"/Yc${_prefixFileNative}" "/Fp${_pchFileNative}" "/FI${_prefixFileNative}" /Zs "${_hostFileNative}")
-			if (COTIRE_PCH_MEMORY_SCALING_FACTOR)
-				list (APPEND _flags "/Zm${COTIRE_PCH_MEMORY_SCALING_FACTOR}")
-			endif()
-		else()
-			# return as a flag string
-			set (_flags "/Yc\"${_prefixFileNative}\" /Fp\"${_pchFileNative}\" /FI\"${_prefixFileNative}\"")
-			if (COTIRE_PCH_MEMORY_SCALING_FACTOR)
-				set (_flags "${_flags} /Zm${COTIRE_PCH_MEMORY_SCALING_FACTOR}")
-			endif()
-		endif()
-	elseif (_compilerID MATCHES "GNU|Clang")
-		# GCC / Clang options used
-		# -x specify the source language
-		# -c compile but do not link
-		# -o place output in file
-		# note that we cannot use -w to suppress all warnings upon pre-compiling, because turning off a warning may
-		# alter compile flags as a side effect (e.g., -Wwrite-string implies -fconst-strings)
-		set (_xLanguage_C "c-header")
-		set (_xLanguage_CXX "c++-header")
-		if (_flags)
-			# append to list
-			list (APPEND _flags "-x" "${_xLanguage_${_language}}" "-c" "${_prefixFile}" -o "${_pchFile}")
-		else()
-			# return as a flag string
-			set (_flags "-x ${_xLanguage_${_language}} -c \"${_prefixFile}\" -o \"${_pchFile}\"")
-		endif()
-	elseif (_compilerID MATCHES "Intel")
-		if (WIN32)
-			file (TO_NATIVE_PATH "${_prefixFile}" _prefixFileNative)
-			file (TO_NATIVE_PATH "${_pchFile}" _pchFileNative)
-			file (TO_NATIVE_PATH "${_hostFile}" _hostFileNative)
-			# Windows Intel options used
-			# /nologo do not display compiler version information
-			# /Yc create a precompiled header (PCH) file
-			# /Fp specify a path or file name for precompiled header files
-			# /FI tells the preprocessor to include a specified file name as the header file
-			# /TC process all source or unrecognized file types as C source files
-			# /TP process all source or unrecognized file types as C++ source files
-			# /Zs syntax check only
-			# /Wpch-messages enable diagnostics related to pre-compiled headers (requires Intel XE 2013 Update 2)
-			set (_sourceFileTypeC "/TC")
-			set (_sourceFileTypeCXX "/TP")
-			if (_flags)
-				# append to list
-				list (APPEND _flags /nologo "${_sourceFileType${_language}}"
-					"/Yc" "/Fp${_pchFileNative}" "/FI${_prefixFileNative}" /Zs "${_hostFileNative}")
-				if (NOT "${_compilerVersion}" VERSION_LESS "13.1.0")
-					list (APPEND _flags "/Wpch-messages")
-				endif()
-			else()
-				# return as a flag string
-				set (_flags "/Yc /Fp\"${_pchFileNative}\" /FI\"${_prefixFileNative}\"")
-				if (NOT "${_compilerVersion}" VERSION_LESS "13.1.0")
-					set (_flags "${_flags} /Wpch-messages")
-				endif()
-			endif()
-		else()
-			# Linux / Mac OS X Intel options used
-			# -pch-dir location for precompiled header files
-			# -pch-create name of the precompiled header (PCH) to create
-			# -Kc++ process all source or unrecognized file types as C++ source files
-			# -fsyntax-only check only for correct syntax
-			# -Wpch-messages enable diagnostics related to pre-compiled headers (requires Intel XE 2013 Update 2)
-			get_filename_component(_pchDir "${_pchFile}" PATH)
-			get_filename_component(_pchName "${_pchFile}" NAME)
-			set (_xLanguage_C "c-header")
-			set (_xLanguage_CXX "c++-header")
-			if (_flags)
-				# append to list
-				if ("${_language}" STREQUAL "CXX")
-					list (APPEND _flags -Kc++)
-				endif()
-				list (APPEND _flags "-include" "${_prefixFile}" "-pch-dir" "${_pchDir}" "-pch-create" "${_pchName}" "-fsyntax-only" "${_hostFile}")
-				if (NOT "${_compilerVersion}" VERSION_LESS "13.1.0")
-					list (APPEND _flags "-Wpch-messages")
-				endif()
-			else()
-				# return as a flag string
-				set (_flags "-include \"${_prefixFile}\" -pch-dir \"${_pchDir}\" -pch-create \"${_pchName}\"")
-				if (NOT "${_compilerVersion}" VERSION_LESS "13.1.0")
-					set (_flags "${_flags} -Wpch-messages")
-				endif()
-			endif()
-		endif()
-	else()
-		message (FATAL_ERROR "cotire: unsupported ${_language} compiler ${_compilerID} version ${_compilerVersion}.")
-	endif()
-	set (${_flagsVar} ${_flags} PARENT_SCOPE)
-endfunction()
-
-function (cotire_add_prefix_pch_inclusion_flags _language _compilerID _compilerVersion _prefixFile _pchFile _flagsVar)
-	set (_flags ${${_flagsVar}})
-	if (_compilerID MATCHES "MSVC")
-		file (TO_NATIVE_PATH "${_prefixFile}" _prefixFileNative)
-		# cl.exe options used
-		# /Yu uses a precompiled header file during build
-		# /Fp specifies precompiled header binary file name
-		# /FI forces inclusion of file
-		# /Zm precompiled header memory allocation scaling factor
-		if (_pchFile)
-			file (TO_NATIVE_PATH "${_pchFile}" _pchFileNative)
-			if (_flags)
-				# append to list
-				list (APPEND _flags "/Yu${_prefixFileNative}" "/Fp${_pchFileNative}" "/FI${_prefixFileNative}")
-				if (COTIRE_PCH_MEMORY_SCALING_FACTOR)
-					list (APPEND _flags "/Zm${COTIRE_PCH_MEMORY_SCALING_FACTOR}")
-				endif()
-			else()
-				# return as a flag string
-				set (_flags "/Yu\"${_prefixFileNative}\" /Fp\"${_pchFileNative}\" /FI\"${_prefixFileNative}\"")
-				if (COTIRE_PCH_MEMORY_SCALING_FACTOR)
-					set (_flags "${_flags} /Zm${COTIRE_PCH_MEMORY_SCALING_FACTOR}")
-				endif()
-			endif()
-		else()
-			# no precompiled header, force inclusion of prefix header
-			if (_flags)
-				# append to list
-				list (APPEND _flags "/FI${_prefixFileNative}")
-			else()
-				# return as a flag string
-				set (_flags "/FI\"${_prefixFileNative}\"")
-			endif()
-		endif()
-	elseif (_compilerID MATCHES "GNU")
-		# GCC options used
-		# -include process include file as the first line of the primary source file
-		# -Winvalid-pch warns if precompiled header is found but cannot be used
-		# note: ccache requires the -include flag to be used in order to process precompiled header correctly
-		if (_flags)
-			# append to list
-			list (APPEND _flags "-Winvalid-pch" "-include" "${_prefixFile}")
-		else()
-			# return as a flag string
-			set (_flags "-Winvalid-pch -include \"${_prefixFile}\"")
-		endif()
-	elseif (_compilerID MATCHES "Clang")
-		# Clang options used
-		# -include process include file as the first line of the primary source file
-		# -include-pch include precompiled header file
-		# -Qunused-arguments don't emit warning for unused driver arguments
-		# note: ccache requires the -include flag to be used in order to process precompiled header correctly
-		if (_flags)
-			# append to list
-			list (APPEND _flags "-Qunused-arguments" "-include" "${_prefixFile}")
-		else()
-			# return as a flag string
-			set (_flags "-Qunused-arguments -include \"${_prefixFile}\"")
-		endif()
-	elseif (_compilerID MATCHES "Intel")
-		if (WIN32)
-			file (TO_NATIVE_PATH "${_prefixFile}" _prefixFileNative)
-			# Windows Intel options used
-			# /Yu use a precompiled header (PCH) file
-			# /Fp specify a path or file name for precompiled header files
-			# /FI tells the preprocessor to include a specified file name as the header file
-			# /Wpch-messages enable diagnostics related to pre-compiled headers (requires Intel XE 2013 Update 2)
-			if (_pchFile)
-				file (TO_NATIVE_PATH "${_pchFile}" _pchFileNative)
-				if (_flags)
-					# append to list
-					list (APPEND _flags "/Yu" "/Fp${_pchFileNative}" "/FI${_prefixFileNative}")
-					if (NOT "${_compilerVersion}" VERSION_LESS "13.1.0")
-						list (APPEND _flags "/Wpch-messages")
-					endif()
-				else()
-					# return as a flag string
-					set (_flags "/Yu /Fp\"${_pchFileNative}\" /FI\"${_prefixFileNative}\"")
-					if (NOT "${_compilerVersion}" VERSION_LESS "13.1.0")
-						set (_flags "${_flags} /Wpch-messages")
-					endif()
-				endif()
-			else()
-				# no precompiled header, force inclusion of prefix header
-				if (_flags)
-					# append to list
-					list (APPEND _flags "/FI${_prefixFileNative}")
-				else()
-					# return as a flag string
-					set (_flags "/FI\"${_prefixFileNative}\"")
-				endif()
-			endif()
-		else()
-			# Linux / Mac OS X Intel options used
-			# -pch-dir location for precompiled header files
-			# -pch-use name of the precompiled header (PCH) to use
-			# -include process include file as the first line of the primary source file
-			# -Wpch-messages enable diagnostics related to pre-compiled headers (requires Intel XE 2013 Update 2)
-			if (_pchFile)
-				get_filename_component(_pchDir "${_pchFile}" PATH)
-				get_filename_component(_pchName "${_pchFile}" NAME)
-				if (_flags)
-					# append to list
-					list (APPEND _flags "-include" "${_prefixFile}" "-pch-dir" "${_pchDir}" "-pch-use" "${_pchName}")
-					if (NOT "${_compilerVersion}" VERSION_LESS "13.1.0")
-						list (APPEND _flags "-Wpch-messages")
-					endif()
-				else()
-					# return as a flag string
-					set (_flags "-include \"${_prefixFile}\" -pch-dir \"${_pchDir}\" -pch-use \"${_pchName}\"")
-					if (NOT "${_compilerVersion}" VERSION_LESS "13.1.0")
-						set (_flags "${_flags} -Wpch-messages")
-					endif()
-				endif()
-			else()
-				# no precompiled header, force inclusion of prefix header
-				if (_flags)
-					# append to list
-					list (APPEND _flags "-include" "${_prefixFile}")
-				else()
-					# return as a flag string
-					set (_flags "-include \"${_prefixFile}\"")
-				endif()
-			endif()
-		endif()
-	else()
-		message (FATAL_ERROR "cotire: unsupported ${_language} compiler ${_compilerID} version ${_compilerVersion}.")
-	endif()
-	set (${_flagsVar} ${_flags} PARENT_SCOPE)
-endfunction()
-
-function (cotire_precompile_prefix_header _prefixFile _pchFile _hostFile)
-	set(_options "")
-	set(_oneValueArgs COMPILER_EXECUTABLE COMPILER_ID COMPILER_VERSION INCLUDE_SYSTEM_FLAG LANGUAGE)
-	set(_multiValueArgs COMPILE_DEFINITIONS COMPILE_FLAGS INCLUDE_DIRECTORIES SYSTEM_INCLUDE_DIRECTORIES SYS)
-	cmake_parse_arguments(_option "${_options}" "${_oneValueArgs}" "${_multiValueArgs}" ${ARGN})
-	if (NOT _option_LANGUAGE)
-		set (_option_LANGUAGE "CXX")
-	endif()
-	if (NOT _option_COMPILER_ID)
-		set (_option_COMPILER_ID "${CMAKE_${_option_LANGUAGE}_ID}")
-	endif()
-	if (NOT _option_COMPILER_VERSION)
-		set (_option_COMPILER_VERSION "${CMAKE_${_option_LANGUAGE}_COMPILER_VERSION}")
-	endif()
-	cotire_init_compile_cmd(_cmd "${_option_LANGUAGE}" "${_option_COMPILER_EXECUTABLE}" "${_option_COMPILER_ARG1}")
-	cotire_add_definitions_to_cmd(_cmd "${_option_LANGUAGE}" ${_option_COMPILE_DEFINITIONS})
-	cotire_add_compile_flags_to_cmd(_cmd ${_option_COMPILE_FLAGS})
-	cotire_add_includes_to_cmd(_cmd "${_option_LANGUAGE}" "${_option_INCLUDE_SYSTEM_FLAG}" _option_INCLUDE_DIRECTORIES _option_SYSTEM_INCLUDE_DIRECTORIES)
-	cotire_add_frameworks_to_cmd(_cmd "${_option_LANGUAGE}" ${_option_INCLUDE_DIRECTORIES})
-	cotire_add_pch_compilation_flags(
-		"${_option_LANGUAGE}" "${_option_COMPILER_ID}" "${_option_COMPILER_VERSION}"
-		"${_prefixFile}" "${_pchFile}" "${_hostFile}" _cmd)
-	if (COTIRE_VERBOSE)
-		message (STATUS "execute_process: ${_cmd}")
-	endif()
-	if (_option_COMPILER_ID MATCHES "MSVC")
-		# cl.exe messes with the output streams unless the environment variable VS_UNICODE_OUTPUT is cleared
-		unset (ENV{VS_UNICODE_OUTPUT})
-	endif()
-	execute_process(
-		COMMAND ${_cmd}
-		WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
-		RESULT_VARIABLE _result)
-	if (_result)
-		message (FATAL_ERROR "cotire: error ${_result} precompiling ${_prefixFile}.")
-	endif()
-endfunction()
-
-function (cotire_check_precompiled_header_support _language _target _msgVar)
-	set (_unsupportedCompiler
-		"Precompiled headers not supported for ${_language} compiler ${CMAKE_${_language}_COMPILER_ID}")
-	if (CMAKE_${_language}_COMPILER_ID MATCHES "MSVC")
-		# supported since Visual Studio C++ 6.0
-		# and CMake does not support an earlier version
-		set (${_msgVar} "" PARENT_SCOPE)
-	elseif (CMAKE_${_language}_COMPILER_ID MATCHES "GNU")
-		# GCC PCH support requires version >= 3.4
-		if ("${CMAKE_${_language}_COMPILER_VERSION}" VERSION_LESS "3.4.0")
-			set (${_msgVar} "${_unsupportedCompiler} version ${CMAKE_${_language}_COMPILER_VERSION}." PARENT_SCOPE)
-		else()
-			set (${_msgVar} "" PARENT_SCOPE)
-		endif()
-	elseif (CMAKE_${_language}_COMPILER_ID MATCHES "Clang")
-		# all Clang versions have PCH support
-		set (${_msgVar} "" PARENT_SCOPE)
-	elseif (CMAKE_${_language}_COMPILER_ID MATCHES "Intel")
-		# Intel PCH support requires version >= 8.0.0
-		if ("${CMAKE_${_language}_COMPILER_VERSION}" VERSION_LESS "8.0.0")
-			set (${_msgVar} "${_unsupportedCompiler} version ${CMAKE_${_language}_COMPILER_VERSION}." PARENT_SCOPE)
-		else()
-			set (${_msgVar} "" PARENT_SCOPE)
-		endif()
-	else()
-		set (${_msgVar} "${_unsupportedCompiler}." PARENT_SCOPE)
-	endif()
-	if (CMAKE_${_language}_COMPILER MATCHES "ccache")
-		if (NOT "$ENV{CCACHE_SLOPPINESS}" MATCHES "time_macros|pch_defines")
-			set (${_msgVar}
-				"ccache requires the environment variable CCACHE_SLOPPINESS to be set to \"pch_defines,time_macros\"."
-				PARENT_SCOPE)
-		endif()
-	endif()
-	if (APPLE)
-		# PCH compilation not supported by GCC / Clang for multi-architecture builds (e.g., i386, x86_64)
-		cotire_get_configuration_types(_configs)
-		foreach (_config ${_configs})
-			set (_targetFlags "")
-			cotire_get_target_compile_flags("${_config}" "${_language}" "${_target}" _targetFlags)
-			cotire_filter_compile_flags("${_language}" "arch" _architectures _ignore ${_targetFlags})
-			list (LENGTH _architectures _numberOfArchitectures)
-			if (_numberOfArchitectures GREATER 1)
-				string (REPLACE ";" ", " _architectureStr "${_architectures}")
-				set (${_msgVar}
-					"Precompiled headers not supported on Darwin for multi-architecture builds (${_architectureStr})."
-					PARENT_SCOPE)
-				break()
-			endif()
-		endforeach()
-	endif()
-endfunction()
-
-macro (cotire_get_intermediate_dir _cotireDir)
-	# ${CMAKE_CFG_INTDIR} may reference a build-time variable when using a generator which supports configuration types
-	get_filename_component(${_cotireDir} "${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/${COTIRE_INTDIR}" ABSOLUTE)
-endmacro()
-
-macro (cotire_setup_file_extension_variables)
-	set (_unityFileExt_C ".c")
-	set (_unityFileExt_CXX ".cxx")
-	set (_prefixFileExt_C ".h")
-	set (_prefixFileExt_CXX ".hxx")
-	set (_prefixSourceFileExt_C ".c")
-	set (_prefixSourceFileExt_CXX ".cxx")
-endmacro()
-
 function (cotire_make_single_unity_source_file_path _language _target _unityFileVar)
-	cotire_setup_file_extension_variables()
-	if (NOT DEFINED _unityFileExt_${_language})
-		set (${_unityFileVar} "" PARENT_SCOPE)
-		return()
-	endif()
-	set (_unityFileBaseName "${_target}_${_language}${COTIRE_UNITY_SOURCE_FILENAME_SUFFIX}")
-	set (_unityFileName "${_unityFileBaseName}${_unityFileExt_${_language}}")
-	cotire_get_intermediate_dir(_baseDir)
-	set (_unityFile "${_baseDir}/${_unityFileName}")
-	set (${_unityFileVar} "${_unityFile}" PARENT_SCOPE)
+    cotire_setup_file_extension_variables()
+    if (NOT DEFINED _unityFileExt_${_language})
+        set (${_unityFileVar} "" PARENT_SCOPE)
+        return()
+    endif()
+    set (_unityFileBaseName "${_target}_${_language}${COTIRE_UNITY_SOURCE_FILENAME_SUFFIX}")
+    set (_unityFileName "${_unityFileBaseName}${_unityFileExt_${_language}}")
+    cotire_get_intermediate_dir(_baseDir)
+    set (_unityFile "${_baseDir}/${_unityFileName}")
+    set (${_unityFileVar} "${_unityFile}" PARENT_SCOPE)
 endfunction()

 function (cotire_make_unity_source_file_paths _language _target _maxIncludes _unityFilesVar)
-	cotire_setup_file_extension_variables()
-	if (NOT DEFINED _unityFileExt_${_language})
-		set (${_unityFileVar} "" PARENT_SCOPE)
-		return()
-	endif()
-	set (_unityFileBaseName "${_target}_${_language}${COTIRE_UNITY_SOURCE_FILENAME_SUFFIX}")
-	cotire_get_intermediate_dir(_baseDir)
-	set (_startIndex 0)
-	set (_index 0)
-	set (_unityFiles "")
-	set (_sourceFiles ${ARGN})
-	foreach (_sourceFile ${_sourceFiles})
-		get_source_file_property(_startNew "${_sourceFile}" COTIRE_START_NEW_UNITY_SOURCE)
-		math (EXPR _unityFileCount "${_index} - ${_startIndex}")
-		if (_startNew OR (_maxIncludes GREATER 0 AND NOT _unityFileCount LESS _maxIncludes))
-			if (_index GREATER 0)
-				# start new unity file segment
-				math (EXPR _endIndex "${_index} - 1")
-				set (_unityFileName "${_unityFileBaseName}_${_startIndex}_${_endIndex}${_unityFileExt_${_language}}")
-				list (APPEND _unityFiles "${_baseDir}/${_unityFileName}")
-			endif()
-			set (_startIndex ${_index})
-		endif()
-		math (EXPR _index "${_index} + 1")
-	endforeach()
-	list (LENGTH _sourceFiles _numberOfSources)
-	if (_startIndex EQUAL 0)
-		# there is only a single unity file
-		cotire_make_single_unity_source_file_path(${_language} ${_target} _unityFiles)
-	elseif (_startIndex LESS _numberOfSources)
-		# end with final unity file segment
-		math (EXPR _endIndex "${_index} - 1")
-		set (_unityFileName "${_unityFileBaseName}_${_startIndex}_${_endIndex}${_unityFileExt_${_language}}")
-		list (APPEND _unityFiles "${_baseDir}/${_unityFileName}")
-	endif()
-	set (${_unityFilesVar} ${_unityFiles} PARENT_SCOPE)
-	if (COTIRE_DEBUG AND _unityFiles)
-		message (STATUS "unity files: ${_unityFiles}")
-	endif()
+    cotire_setup_file_extension_variables()
+    if (NOT DEFINED _unityFileExt_${_language})
+        set (${_unityFileVar} "" PARENT_SCOPE)
+        return()
+    endif()
+    set (_unityFileBaseName "${_target}_${_language}${COTIRE_UNITY_SOURCE_FILENAME_SUFFIX}")
+    cotire_get_intermediate_dir(_baseDir)
+    set (_startIndex 0)
+    set (_index 0)
+    set (_unityFiles "")
+    set (_sourceFiles ${ARGN})
+    foreach (_sourceFile ${_sourceFiles})
+        get_source_file_property(_startNew "${_sourceFile}" COTIRE_START_NEW_UNITY_SOURCE)
+        math (EXPR _unityFileCount "${_index} - ${_startIndex}")
+        if (_startNew OR (_maxIncludes GREATER 0 AND NOT _unityFileCount LESS _maxIncludes))
+            if (_index GREATER 0)
+                # start new unity file segment
+                math (EXPR _endIndex "${_index} - 1")
+                set (_unityFileName "${_unityFileBaseName}_${_startIndex}_${_endIndex}${_unityFileExt_${_language}}")
+                list (APPEND _unityFiles "${_baseDir}/${_unityFileName}")
+            endif()
+            set (_startIndex ${_index})
+        endif()
+        math (EXPR _index "${_index} + 1")
+    endforeach()
+    list (LENGTH _sourceFiles _numberOfSources)
+    if (_startIndex EQUAL 0)
+        # there is only a single unity file
+        cotire_make_single_unity_source_file_path(${_language} ${_target} _unityFiles)
+    elseif (_startIndex LESS _numberOfSources)
+        # end with final unity file segment
+        math (EXPR _endIndex "${_index} - 1")
+        set (_unityFileName "${_unityFileBaseName}_${_startIndex}_${_endIndex}${_unityFileExt_${_language}}")
+        list (APPEND _unityFiles "${_baseDir}/${_unityFileName}")
+    endif()
+    set (${_unityFilesVar} ${_unityFiles} PARENT_SCOPE)
+    if (COTIRE_DEBUG AND _unityFiles)
+        message (STATUS "unity files: ${_unityFiles}")
+    endif()
 endfunction()

 function (cotire_unity_to_prefix_file_path _language _target _unityFile _prefixFileVar)
-	cotire_setup_file_extension_variables()
-	if (NOT DEFINED _unityFileExt_${_language})
-		set (${_prefixFileVar} "" PARENT_SCOPE)
-		return()
-	endif()
-	set (_unityFileBaseName "${_target}_${_language}${COTIRE_UNITY_SOURCE_FILENAME_SUFFIX}")
-	set (_prefixFileBaseName "${_target}_${_language}${COTIRE_PREFIX_HEADER_FILENAME_SUFFIX}")
-	string (REPLACE "${_unityFileBaseName}" "${_prefixFileBaseName}" _prefixFile "${_unityFile}")
-	string (REGEX REPLACE "${_unityFileExt_${_language}}$" "${_prefixFileExt_${_language}}" _prefixFile "${_prefixFile}")
-	set (${_prefixFileVar} "${_prefixFile}" PARENT_SCOPE)
+    cotire_setup_file_extension_variables()
+    if (NOT DEFINED _unityFileExt_${_language})
+        set (${_prefixFileVar} "" PARENT_SCOPE)
+        return()
+    endif()
+    set (_unityFileBaseName "${_target}_${_language}${COTIRE_UNITY_SOURCE_FILENAME_SUFFIX}")
+    set (_prefixFileBaseName "${_target}_${_language}${COTIRE_PREFIX_HEADER_FILENAME_SUFFIX}")
+    string (REPLACE "${_unityFileBaseName}" "${_prefixFileBaseName}" _prefixFile "${_unityFile}")
+    string (REGEX REPLACE "${_unityFileExt_${_language}}$" "${_prefixFileExt_${_language}}" _prefixFile "${_prefixFile}")
+    set (${_prefixFileVar} "${_prefixFile}" PARENT_SCOPE)
 endfunction()

 function (cotire_prefix_header_to_source_file_path _language _prefixHeaderFile _prefixSourceFileVar)
-	cotire_setup_file_extension_variables()
-	if (NOT DEFINED _prefixSourceFileExt_${_language})
-		set (${_prefixSourceFileVar} "" PARENT_SCOPE)
-		return()
-	endif()
-	string (REGEX REPLACE "${_prefixFileExt_${_language}}$" "${_prefixSourceFileExt_${_language}}" _prefixSourceFile "${_prefixHeaderFile}")
-	set (${_prefixSourceFileVar} "${_prefixSourceFile}" PARENT_SCOPE)
+    cotire_setup_file_extension_variables()
+    if (NOT DEFINED _prefixSourceFileExt_${_language})
+        set (${_prefixSourceFileVar} "" PARENT_SCOPE)
+        return()
+    endif()
+    string (REGEX REPLACE "${_prefixFileExt_${_language}}$" "${_prefixSourceFileExt_${_language}}" _prefixSourceFile "${_prefixHeaderFile}")
+    set (${_prefixSourceFileVar} "${_prefixSourceFile}" PARENT_SCOPE)
 endfunction()

 function (cotire_make_prefix_file_name _language _target _prefixFileBaseNameVar _prefixFileNameVar)
-	cotire_setup_file_extension_variables()
-	if (NOT _language)
-		set (_prefixFileBaseName "${_target}${COTIRE_PREFIX_HEADER_FILENAME_SUFFIX}")
-		set (_prefixFileName "${_prefixFileBaseName}${_prefixFileExt_C}")
-	elseif (DEFINED _prefixFileExt_${_language})
-		set (_prefixFileBaseName "${_target}_${_language}${COTIRE_PREFIX_HEADER_FILENAME_SUFFIX}")
-		set (_prefixFileName "${_prefixFileBaseName}${_prefixFileExt_${_language}}")
-	else()
-		set (_prefixFileBaseName "")
-		set (_prefixFileName "")
-	endif()
-	set (${_prefixFileBaseNameVar} "${_prefixFileBaseName}" PARENT_SCOPE)
-	set (${_prefixFileNameVar} "${_prefixFileName}" PARENT_SCOPE)
+    cotire_setup_file_extension_variables()
+    if (NOT _language)
+        set (_prefixFileBaseName "${_target}${COTIRE_PREFIX_HEADER_FILENAME_SUFFIX}")
+        set (_prefixFileName "${_prefixFileBaseName}${_prefixFileExt_C}")
+    elseif (DEFINED _prefixFileExt_${_language})
+        set (_prefixFileBaseName "${_target}_${_language}${COTIRE_PREFIX_HEADER_FILENAME_SUFFIX}")
+        set (_prefixFileName "${_prefixFileBaseName}${_prefixFileExt_${_language}}")
+    else()
+        set (_prefixFileBaseName "")
+        set (_prefixFileName "")
+    endif()
+    set (${_prefixFileBaseNameVar} "${_prefixFileBaseName}" PARENT_SCOPE)
+    set (${_prefixFileNameVar} "${_prefixFileName}" PARENT_SCOPE)
 endfunction()

 function (cotire_make_prefix_file_path _language _target _prefixFileVar)
-	cotire_make_prefix_file_name("${_language}" "${_target}" _prefixFileBaseName _prefixFileName)
-	set (${_prefixFileVar} "" PARENT_SCOPE)
-	if (_prefixFileName)
-		if (NOT _language)
-			set (_language "C")
-		endif()
-		if (CMAKE_${_language}_COMPILER_ID MATCHES "GNU|Clang|Intel|MSVC")
-			cotire_get_intermediate_dir(_baseDir)
-			set (${_prefixFileVar} "${_baseDir}/${_prefixFileName}" PARENT_SCOPE)
-		endif()
-	endif()
+    cotire_make_prefix_file_name("${_language}" "${_target}" _prefixFileBaseName _prefixFileName)
+    set (${_prefixFileVar} "" PARENT_SCOPE)
+    if (_prefixFileName)
+        if (NOT _language)
+            set (_language "C")
+        endif()
+        if (CMAKE_${_language}_COMPILER_ID MATCHES "GNU|Clang|Intel|MSVC")
+            cotire_get_intermediate_dir(_baseDir)
+            set (${_prefixFileVar} "${_baseDir}/${_prefixFileName}" PARENT_SCOPE)
+        endif()
+    endif()
 endfunction()

 function (cotire_make_pch_file_path _language _target _pchFileVar)
-	cotire_make_prefix_file_name("${_language}" "${_target}" _prefixFileBaseName _prefixFileName)
-	set (${_pchFileVar} "" PARENT_SCOPE)
-	if (_prefixFileBaseName AND _prefixFileName)
-		cotire_check_precompiled_header_support("${_language}" "${_target}" _msg)
-		if (NOT _msg)
-			if (XCODE)
-				# For Xcode, we completely hand off the compilation of the prefix header to the IDE
-				return()
-			endif()
-			cotire_get_intermediate_dir(_baseDir)
-			if (CMAKE_${_language}_COMPILER_ID MATCHES "MSVC")
-				# MSVC uses the extension .pch added to the prefix header base name
-				set (${_pchFileVar} "${_baseDir}/${_prefixFileBaseName}.pch" PARENT_SCOPE)
-			elseif (CMAKE_${_language}_COMPILER_ID MATCHES "Clang")
-				# Clang looks for a precompiled header corresponding to the prefix header with the extension .pch appended
-				set (${_pchFileVar} "${_baseDir}/${_prefixFileName}.pch" PARENT_SCOPE)
-			elseif (CMAKE_${_language}_COMPILER_ID MATCHES "GNU")
-				# GCC looks for a precompiled header corresponding to the prefix header with the extension .gch appended
-				set (${_pchFileVar} "${_baseDir}/${_prefixFileName}.gch" PARENT_SCOPE)
-			elseif (CMAKE_${_language}_COMPILER_ID MATCHES "Intel")
-				# Intel uses the extension .pchi added to the prefix header base name
-				set (${_pchFileVar} "${_baseDir}/${_prefixFileBaseName}.pchi" PARENT_SCOPE)
-			endif()
-		endif()
-	endif()
+    cotire_make_prefix_file_name("${_language}" "${_target}" _prefixFileBaseName _prefixFileName)
+    set (${_pchFileVar} "" PARENT_SCOPE)
+    if (_prefixFileBaseName AND _prefixFileName)
+        cotire_check_precompiled_header_support("${_language}" "${_target}" _msg)
+        if (NOT _msg)
+            if (XCODE)
+                # For Xcode, we completely hand off the compilation of the prefix header to the IDE
+                return()
+            endif()
+            cotire_get_intermediate_dir(_baseDir)
+            if (CMAKE_${_language}_COMPILER_ID MATCHES "MSVC")
+                # MSVC uses the extension .pch added to the prefix header base name
+                set (${_pchFileVar} "${_baseDir}/${_prefixFileBaseName}.pch" PARENT_SCOPE)
+            elseif (CMAKE_${_language}_COMPILER_ID MATCHES "Clang")
+                # Clang looks for a precompiled header corresponding to the prefix header with the extension .pch appended
+                set (${_pchFileVar} "${_baseDir}/${_prefixFileName}.pch" PARENT_SCOPE)
+            elseif (CMAKE_${_language}_COMPILER_ID MATCHES "GNU")
+                # GCC looks for a precompiled header corresponding to the prefix header with the extension .gch appended
+                set (${_pchFileVar} "${_baseDir}/${_prefixFileName}.gch" PARENT_SCOPE)
+            elseif (CMAKE_${_language}_COMPILER_ID MATCHES "Intel")
+                # Intel uses the extension .pchi added to the prefix header base name
+                set (${_pchFileVar} "${_baseDir}/${_prefixFileBaseName}.pchi" PARENT_SCOPE)
+            endif()
+        endif()
+    endif()
 endfunction()

 function (cotire_select_unity_source_files _unityFile _sourcesVar)
-	set (_sourceFiles ${ARGN})
-	if (_sourceFiles AND "${_unityFile}" MATCHES "${COTIRE_UNITY_SOURCE_FILENAME_SUFFIX}_([0-9]+)_([0-9]+)")
-		set (_startIndex ${CMAKE_MATCH_1})
-		set (_endIndex ${CMAKE_MATCH_2})
-		list (LENGTH _sourceFiles _numberOfSources)
-		if (NOT _startIndex LESS _numberOfSources)
-			math (EXPR _startIndex "${_numberOfSources} - 1")
-		endif()
-		if (NOT _endIndex LESS _numberOfSources)
-			math (EXPR _endIndex "${_numberOfSources} - 1")
-		endif()
-		set (_files "")
-		foreach (_index RANGE ${_startIndex} ${_endIndex})
-			list (GET _sourceFiles ${_index} _file)
-			list (APPEND _files "${_file}")
-		endforeach()
-	else()
-		set (_files ${_sourceFiles})
-	endif()
-	set (${_sourcesVar} ${_files} PARENT_SCOPE)
+    set (_sourceFiles ${ARGN})
+    if (_sourceFiles AND "${_unityFile}" MATCHES "${COTIRE_UNITY_SOURCE_FILENAME_SUFFIX}_([0-9]+)_([0-9]+)")
+        set (_startIndex ${CMAKE_MATCH_1})
+        set (_endIndex ${CMAKE_MATCH_2})
+        list (LENGTH _sourceFiles _numberOfSources)
+        if (NOT _startIndex LESS _numberOfSources)
+            math (EXPR _startIndex "${_numberOfSources} - 1")
+        endif()
+        if (NOT _endIndex LESS _numberOfSources)
+            math (EXPR _endIndex "${_numberOfSources} - 1")
+        endif()
+        set (_files "")
+        foreach (_index RANGE ${_startIndex} ${_endIndex})
+            list (GET _sourceFiles ${_index} _file)
+            list (APPEND _files "${_file}")
+        endforeach()
+    else()
+        set (_files ${_sourceFiles})
+    endif()
+    set (${_sourcesVar} ${_files} PARENT_SCOPE)
 endfunction()

 function (cotire_get_unity_source_dependencies _language _target _dependencySourcesVar)
-	set (_dependencySources "")
-	# depend on target's generated source files
-	get_target_property(_targetSourceFiles ${_target} SOURCES)
-	cotire_get_objects_with_property_on(_generatedSources GENERATED SOURCE ${_targetSourceFiles})
-	if (_generatedSources)
-		# but omit all generated source files that have the COTIRE_EXCLUDED property set to true
-		cotire_get_objects_with_property_on(_excludedGeneratedSources COTIRE_EXCLUDED SOURCE ${_generatedSources})
-		if (_excludedGeneratedSources)
-			list (REMOVE_ITEM _generatedSources ${_excludedGeneratedSources})
-		endif()
-		# and omit all generated source files that have the COTIRE_DEPENDENCY property set to false explicitly
-		cotire_get_objects_with_property_off(_excludedNonDependencySources COTIRE_DEPENDENCY SOURCE ${_generatedSources})
-		if (_excludedNonDependencySources)
-			list (REMOVE_ITEM _generatedSources ${_excludedNonDependencySources})
-		endif()
-		if (_generatedSources)
-			list (APPEND _dependencySources ${_generatedSources})
-		endif()
-	endif()
-	if (COTIRE_DEBUG AND _dependencySources)
-		message (STATUS "${_language} ${_target} unity source dependencies: ${_dependencySources}")
-	endif()
-	set (${_dependencySourcesVar} ${_dependencySources} PARENT_SCOPE)
+    set (_dependencySources "")
+    # depend on target's generated source files
+    get_target_property(_targetSourceFiles ${_target} SOURCES)
+    cotire_get_objects_with_property_on(_generatedSources GENERATED SOURCE ${_targetSourceFiles})
+    if (_generatedSources)
+        # but omit all generated source files that have the COTIRE_EXCLUDED property set to true
+        cotire_get_objects_with_property_on(_excludedGeneratedSources COTIRE_EXCLUDED SOURCE ${_generatedSources})
+        if (_excludedGeneratedSources)
+            list (REMOVE_ITEM _generatedSources ${_excludedGeneratedSources})
+        endif()
+        # and omit all generated source files that have the COTIRE_DEPENDENCY property set to false explicitly
+        cotire_get_objects_with_property_off(_excludedNonDependencySources COTIRE_DEPENDENCY SOURCE ${_generatedSources})
+        if (_excludedNonDependencySources)
+            list (REMOVE_ITEM _generatedSources ${_excludedNonDependencySources})
+        endif()
+        if (_generatedSources)
+            list (APPEND _dependencySources ${_generatedSources})
+        endif()
+    endif()
+    if (COTIRE_DEBUG AND _dependencySources)
+        message (STATUS "${_language} ${_target} unity source dependencies: ${_dependencySources}")
+    endif()
+    set (${_dependencySourcesVar} ${_dependencySources} PARENT_SCOPE)
 endfunction()

 function (cotire_get_prefix_header_dependencies _language _target _dependencySourcesVar)
-	set (_dependencySources "")
-	# depend on target source files marked with custom COTIRE_DEPENDENCY property
-	get_target_property(_targetSourceFiles ${_target} SOURCES)
-	cotire_get_objects_with_property_on(_dependencySources COTIRE_DEPENDENCY SOURCE ${_targetSourceFiles})
-	if (CMAKE_${_language}_COMPILER_ID MATCHES "GNU|Clang")
-		# GCC and clang raise a fatal error if a file is not found during preprocessing
-		# thus we depend on target's generated source files for prefix header generation
-		cotire_get_objects_with_property_on(_generatedSources GENERATED SOURCE ${_targetSourceFiles})
-		if (_generatedSources)
-			list (APPEND _dependencySources ${_generatedSources})
-		endif()
-	endif()
-	if (COTIRE_DEBUG AND _dependencySources)
-		message (STATUS "${_language} ${_target} prefix header dependencies: ${_dependencySources}")
-	endif()
-	set (${_dependencySourcesVar} ${_dependencySources} PARENT_SCOPE)
+    set (_dependencySources "")
+    # depend on target source files marked with custom COTIRE_DEPENDENCY property
+    get_target_property(_targetSourceFiles ${_target} SOURCES)
+    cotire_get_objects_with_property_on(_dependencySources COTIRE_DEPENDENCY SOURCE ${_targetSourceFiles})
+    if (COTIRE_DEBUG AND _dependencySources)
+        message (STATUS "${_language} ${_target} prefix header dependencies: ${_dependencySources}")
+    endif()
+    set (${_dependencySourcesVar} ${_dependencySources} PARENT_SCOPE)
 endfunction()

 function (cotire_generate_target_script _language _configurations _target _targetScriptVar _targetConfigScriptVar)
-	set (_targetSources ${ARGN})
-	cotire_get_prefix_header_dependencies(${_language} ${_target} COTIRE_TARGET_PREFIX_DEPENDS ${_targetSources})
-	cotire_get_unity_source_dependencies(${_language} ${_target} COTIRE_TARGET_UNITY_DEPENDS ${_targetSources})
-	# set up variables to be configured
-	set (COTIRE_TARGET_LANGUAGE "${_language}")
-	get_target_property(COTIRE_TARGET_IGNORE_PATH ${_target} COTIRE_PREFIX_HEADER_IGNORE_PATH)
-	cotire_add_sys_root_paths(COTIRE_TARGET_IGNORE_PATH)
-	get_target_property(COTIRE_TARGET_INCLUDE_PATH ${_target} COTIRE_PREFIX_HEADER_INCLUDE_PATH)
-	cotire_add_sys_root_paths(COTIRE_TARGET_INCLUDE_PATH)
-	get_target_property(COTIRE_TARGET_PRE_UNDEFS ${_target} COTIRE_UNITY_SOURCE_PRE_UNDEFS)
-	get_target_property(COTIRE_TARGET_POST_UNDEFS ${_target} COTIRE_UNITY_SOURCE_POST_UNDEFS)
-	get_target_property(COTIRE_TARGET_MAXIMUM_NUMBER_OF_INCLUDES ${_target} COTIRE_UNITY_SOURCE_MAXIMUM_NUMBER_OF_INCLUDES)
-	get_target_property(COTIRE_TARGET_INCLUDE_PRIORITY_PATH ${_target} COTIRE_PREFIX_HEADER_INCLUDE_PRIORITY_PATH)
-	cotire_get_source_files_undefs(COTIRE_UNITY_SOURCE_PRE_UNDEFS COTIRE_TARGET_SOURCES_PRE_UNDEFS ${_targetSources})
-	cotire_get_source_files_undefs(COTIRE_UNITY_SOURCE_POST_UNDEFS COTIRE_TARGET_SOURCES_POST_UNDEFS ${_targetSources})
-	string (STRIP "${CMAKE_INCLUDE_SYSTEM_FLAG_${_language}}" COTIRE_INCLUDE_SYSTEM_FLAG)
-	set (COTIRE_TARGET_CONFIGURATION_TYPES "${_configurations}")
-	foreach (_config ${_configurations})
-		string (TOUPPER "${_config}" _upperConfig)
-		cotire_get_target_include_directories(
-			"${_config}" "${_language}" "${_target}" COTIRE_TARGET_INCLUDE_DIRECTORIES_${_upperConfig} COTIRE_TARGET_SYSTEM_INCLUDE_DIRECTORIES_${_upperConfig})
-		cotire_get_target_compile_definitions(
-			"${_config}" "${_language}" "${_target}" COTIRE_TARGET_COMPILE_DEFINITIONS_${_upperConfig})
-		cotire_get_target_compiler_flags(
-			"${_config}" "${_language}" "${_target}" COTIRE_TARGET_COMPILE_FLAGS_${_upperConfig})
-		cotire_get_source_files_compile_definitions(
-			"${_config}" "${_language}" COTIRE_TARGET_SOURCES_COMPILE_DEFINITIONS_${_upperConfig} ${_targetSources})
-	endforeach()
-	# set up COTIRE_TARGET_SOURCES
-	set (COTIRE_TARGET_SOURCES "")
-	foreach (_sourceFile ${_targetSources})
-		get_source_file_property(_generated "${_sourceFile}" GENERATED)
-		if (_generated)
-			# use absolute paths for generated files only, retrieving the LOCATION property is an expensive operation
-			get_source_file_property(_sourceLocation "${_sourceFile}" LOCATION)
-			list (APPEND COTIRE_TARGET_SOURCES "${_sourceLocation}")
-		else()
-			list (APPEND COTIRE_TARGET_SOURCES "${_sourceFile}")
-		endif()
-	endforeach()
-	# copy variable definitions to cotire target script
-	get_cmake_property(_vars VARIABLES)
-	string (REGEX MATCHALL "COTIRE_[A-Za-z0-9_]+" _matchVars "${_vars}")
-	# remove COTIRE_VERBOSE which is passed as a CMake define on command line
-	list (REMOVE_ITEM _matchVars COTIRE_VERBOSE)
-	set (_contents "")
-	set (_contentsHasGeneratorExpressions FALSE)
-	foreach (_var IN LISTS _matchVars ITEMS
-		XCODE MSVC CMAKE_GENERATOR CMAKE_BUILD_TYPE CMAKE_CONFIGURATION_TYPES
-		CMAKE_${_language}_COMPILER_ID CMAKE_${_language}_COMPILER_VERSION
-		CMAKE_${_language}_COMPILER CMAKE_${_language}_COMPILER_ARG1
-		CMAKE_${_language}_SOURCE_FILE_EXTENSIONS)
-		if (DEFINED ${_var})
-			string (REPLACE "\"" "\\\"" _value "${${_var}}")
-			set (_contents "${_contents}set (${_var} \"${_value}\")\n")
-			if (NOT _contentsHasGeneratorExpressions)
-				if ("${_value}" MATCHES "\\$<.*>")
-					set (_contentsHasGeneratorExpressions TRUE)
-				endif()
-			endif()
-		endif()
-	endforeach()
-	# generate target script file
-	get_filename_component(_moduleName "${COTIRE_CMAKE_MODULE_FILE}" NAME)
-	set (_targetCotireScript "${CMAKE_CURRENT_BINARY_DIR}/${_target}_${_language}_${_moduleName}")
-	cotire_write_file("CMAKE" "${_targetCotireScript}" "${_contents}" FALSE)
-	if (_contentsHasGeneratorExpressions)
-		# use file(GENERATE ...) to expand generator expressions in the target script at CMake generate-time
-		set (_configNameOrNoneGeneratorExpression "$<$<CONFIG:>:None>$<$<NOT:$<CONFIG:>>:$<CONFIGURATION>>")
-		set (_targetCotireConfigScript "${CMAKE_CURRENT_BINARY_DIR}/${_target}_${_language}_${_configNameOrNoneGeneratorExpression}_${_moduleName}")
-		file (GENERATE OUTPUT "${_targetCotireConfigScript}" INPUT "${_targetCotireScript}")
-	else()
-		set (_targetCotireConfigScript "${_targetCotireScript}")
-	endif()
-	set (${_targetScriptVar} "${_targetCotireScript}" PARENT_SCOPE)
-	set (${_targetConfigScriptVar} "${_targetCotireConfigScript}" PARENT_SCOPE)
+    set (_targetSources ${ARGN})
+    cotire_get_prefix_header_dependencies(${_language} ${_target} COTIRE_TARGET_PREFIX_DEPENDS ${_targetSources})
+    cotire_get_unity_source_dependencies(${_language} ${_target} COTIRE_TARGET_UNITY_DEPENDS ${_targetSources})
+    # set up variables to be configured
+    set (COTIRE_TARGET_LANGUAGE "${_language}")
+    get_target_property(COTIRE_TARGET_IGNORE_PATH ${_target} COTIRE_PREFIX_HEADER_IGNORE_PATH)
+    cotire_add_sys_root_paths(COTIRE_TARGET_IGNORE_PATH)
+    get_target_property(COTIRE_TARGET_INCLUDE_PATH ${_target} COTIRE_PREFIX_HEADER_INCLUDE_PATH)
+    cotire_add_sys_root_paths(COTIRE_TARGET_INCLUDE_PATH)
+    get_target_property(COTIRE_TARGET_PRE_UNDEFS ${_target} COTIRE_UNITY_SOURCE_PRE_UNDEFS)
+    get_target_property(COTIRE_TARGET_POST_UNDEFS ${_target} COTIRE_UNITY_SOURCE_POST_UNDEFS)
+    get_target_property(COTIRE_TARGET_MAXIMUM_NUMBER_OF_INCLUDES ${_target} COTIRE_UNITY_SOURCE_MAXIMUM_NUMBER_OF_INCLUDES)
+    get_target_property(COTIRE_TARGET_INCLUDE_PRIORITY_PATH ${_target} COTIRE_PREFIX_HEADER_INCLUDE_PRIORITY_PATH)
+    cotire_get_source_files_undefs(COTIRE_UNITY_SOURCE_PRE_UNDEFS COTIRE_TARGET_SOURCES_PRE_UNDEFS ${_targetSources})
+    cotire_get_source_files_undefs(COTIRE_UNITY_SOURCE_POST_UNDEFS COTIRE_TARGET_SOURCES_POST_UNDEFS ${_targetSources})
+    set (COTIRE_TARGET_CONFIGURATION_TYPES "${_configurations}")
+    foreach (_config ${_configurations})
+        string (TOUPPER "${_config}" _upperConfig)
+        cotire_get_target_include_directories(
+            "${_config}" "${_language}" "${_target}" COTIRE_TARGET_INCLUDE_DIRECTORIES_${_upperConfig} COTIRE_TARGET_SYSTEM_INCLUDE_DIRECTORIES_${_upperConfig})
+        cotire_get_target_compile_definitions(
+            "${_config}" "${_language}" "${_target}" COTIRE_TARGET_COMPILE_DEFINITIONS_${_upperConfig})
+        cotire_get_target_compiler_flags(
+            "${_config}" "${_language}" "${_target}" COTIRE_TARGET_COMPILE_FLAGS_${_upperConfig})
+        cotire_get_source_files_compile_definitions(
+            "${_config}" "${_language}" COTIRE_TARGET_SOURCES_COMPILE_DEFINITIONS_${_upperConfig} ${_targetSources})
+    endforeach()
+    # set up COTIRE_TARGET_SOURCES
+    set (COTIRE_TARGET_SOURCES "")
+    foreach (_sourceFile ${_targetSources})
+        get_source_file_property(_generated "${_sourceFile}" GENERATED)
+        if (_generated)
+            # use absolute paths for generated files only, retrieving the LOCATION property is an expensive operation
+            get_source_file_property(_sourceLocation "${_sourceFile}" LOCATION)
+            list (APPEND COTIRE_TARGET_SOURCES "${_sourceLocation}")
+        else()
+            list (APPEND COTIRE_TARGET_SOURCES "${_sourceFile}")
+        endif()
+    endforeach()
+    # copy variable definitions to cotire target script
+    get_cmake_property(_vars VARIABLES)
+    string (REGEX MATCHALL "COTIRE_[A-Za-z0-9_]+" _matchVars "${_vars}")
+    # omit COTIRE_*_INIT variables
+    string (REGEX MATCHALL "COTIRE_[A-Za-z0-9_]+_INIT" _initVars "${_matchVars}")
+    if (_initVars)
+        list (REMOVE_ITEM _matchVars ${_initVars})
+    endif()
+    # omit COTIRE_VERBOSE which is passed as a CMake define on command line
+    list (REMOVE_ITEM _matchVars COTIRE_VERBOSE)
+    set (_contents "")
+    set (_contentsHasGeneratorExpressions FALSE)
+    foreach (_var IN LISTS _matchVars ITEMS
+        XCODE MSVC CMAKE_GENERATOR CMAKE_BUILD_TYPE CMAKE_CONFIGURATION_TYPES
+        CMAKE_${_language}_COMPILER_ID CMAKE_${_language}_COMPILER_VERSION
+        CMAKE_${_language}_COMPILER CMAKE_${_language}_COMPILER_ARG1
+        CMAKE_INCLUDE_FLAG_${_language} CMAKE_INCLUDE_FLAG_${_language}_SEP
+        CMAKE_INCLUDE_SYSTEM_FLAG_${_language}
+        CMAKE_${_language}_FRAMEWORK_SEARCH_FLAG
+        CMAKE_${_language}_SYSTEM_FRAMEWORK_SEARCH_FLAG
+        CMAKE_${_language}_SOURCE_FILE_EXTENSIONS)
+        if (DEFINED ${_var})
+            string (REPLACE "\"" "\\\"" _value "${${_var}}")
+            set (_contents "${_contents}set (${_var} \"${_value}\")\n")
+            if (NOT _contentsHasGeneratorExpressions)
+                if ("${_value}" MATCHES "\\$<.*>")
+                    set (_contentsHasGeneratorExpressions TRUE)
+                endif()
+            endif()
+        endif()
+    endforeach()
+    # generate target script file
+    get_filename_component(_moduleName "${COTIRE_CMAKE_MODULE_FILE}" NAME)
+    set (_targetCotireScript "${CMAKE_CURRENT_BINARY_DIR}/${_target}_${_language}_${_moduleName}")
+    cotire_write_file("CMAKE" "${_targetCotireScript}" "${_contents}" FALSE)
+    if (_contentsHasGeneratorExpressions)
+        # use file(GENERATE ...) to expand generator expressions in the target script at CMake generate-time
+        set (_configNameOrNoneGeneratorExpression "$<$<CONFIG:>:None>$<$<NOT:$<CONFIG:>>:$<CONFIGURATION>>")
+        set (_targetCotireConfigScript "${CMAKE_CURRENT_BINARY_DIR}/${_target}_${_language}_${_configNameOrNoneGeneratorExpression}_${_moduleName}")
+        file (GENERATE OUTPUT "${_targetCotireConfigScript}" INPUT "${_targetCotireScript}")
+    else()
+        set (_targetCotireConfigScript "${_targetCotireScript}")
+    endif()
+    set (${_targetScriptVar} "${_targetCotireScript}" PARENT_SCOPE)
+    set (${_targetConfigScriptVar} "${_targetCotireConfigScript}" PARENT_SCOPE)
 endfunction()

 function (cotire_setup_pch_file_compilation _language _target _targetScript _prefixFile _pchFile _hostFile)
-	set (_sourceFiles ${ARGN})
-	if (CMAKE_${_language}_COMPILER_ID MATCHES "MSVC|Intel")
-		# for Visual Studio and Intel, we attach the precompiled header compilation to the host file
-		# the remaining files include the precompiled header, see cotire_setup_pch_file_inclusion
-		if (_sourceFiles)
-			set (_flags "")
-			cotire_add_pch_compilation_flags(
-				"${_language}" "${CMAKE_${_language}_COMPILER_ID}" "${CMAKE_${_language}_COMPILER_VERSION}"
-				"${_prefixFile}" "${_pchFile}" "${_hostFile}" _flags)
-			set_property (SOURCE ${_hostFile} APPEND_STRING PROPERTY COMPILE_FLAGS " ${_flags} ")
-			set_property (SOURCE ${_hostFile} APPEND PROPERTY OBJECT_OUTPUTS "${_pchFile}")
-			# make object file generated from host file depend on prefix header
-			set_property (SOURCE ${_hostFile} APPEND PROPERTY OBJECT_DEPENDS "${_prefixFile}")
-			# mark host file as cotired to prevent it from being used in another cotired target
-			set_property (SOURCE ${_hostFile} PROPERTY COTIRE_TARGET "${_target}")
-		endif()
-	elseif ("${CMAKE_GENERATOR}" MATCHES "Make|Ninja")
-		# for makefile based generator, we add a custom command to precompile the prefix header
-		if (_targetScript)
-			cotire_set_cmd_to_prologue(_cmds)
-			list (APPEND _cmds -P "${COTIRE_CMAKE_MODULE_FILE}" "precompile" "${_targetScript}" "${_prefixFile}" "${_pchFile}" "${_hostFile}")
-			file (RELATIVE_PATH _pchFileRelPath "${CMAKE_BINARY_DIR}" "${_pchFile}")
-			if (COTIRE_DEBUG)
-				message (STATUS "add_custom_command: OUTPUT ${_pchFile} ${_cmds} DEPENDS ${_prefixFile} IMPLICIT_DEPENDS ${_language} ${_prefixFile}")
-			endif()
-			set_property (SOURCE "${_pchFile}" PROPERTY GENERATED TRUE)
-			add_custom_command(
-				OUTPUT "${_pchFile}"
-				COMMAND ${_cmds}
-				DEPENDS "${_prefixFile}"
-				IMPLICIT_DEPENDS ${_language} "${_prefixFile}"
-				WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
-				COMMENT "Building ${_language} precompiled header ${_pchFileRelPath}"
-				VERBATIM)
-		endif()
-	endif()
+    set (_sourceFiles ${ARGN})
+    if (CMAKE_${_language}_COMPILER_ID MATCHES "MSVC|Intel")
+        # for Visual Studio and Intel, we attach the precompiled header compilation to the host file
+        # the remaining files include the precompiled header, see cotire_setup_pch_file_inclusion
+        if (_sourceFiles)
+            set (_flags "")
+            cotire_add_pch_compilation_flags(
+                "${_language}" "${CMAKE_${_language}_COMPILER_ID}" "${CMAKE_${_language}_COMPILER_VERSION}"
+                "${_prefixFile}" "${_pchFile}" "${_hostFile}" _flags)
+            set_property (SOURCE ${_hostFile} APPEND_STRING PROPERTY COMPILE_FLAGS " ${_flags} ")
+            set_property (SOURCE ${_hostFile} APPEND PROPERTY OBJECT_OUTPUTS "${_pchFile}")
+            # make object file generated from host file depend on prefix header
+            set_property (SOURCE ${_hostFile} APPEND PROPERTY OBJECT_DEPENDS "${_prefixFile}")
+            # mark host file as cotired to prevent it from being used in another cotired target
+            set_property (SOURCE ${_hostFile} PROPERTY COTIRE_TARGET "${_target}")
+        endif()
+    elseif ("${CMAKE_GENERATOR}" MATCHES "Make|Ninja")
+        # for makefile based generator, we add a custom command to precompile the prefix header
+        if (_targetScript)
+            cotire_set_cmd_to_prologue(_cmds)
+            list (APPEND _cmds -P "${COTIRE_CMAKE_MODULE_FILE}" "precompile" "${_targetScript}" "${_prefixFile}" "${_pchFile}" "${_hostFile}")
+            file (RELATIVE_PATH _pchFileRelPath "${CMAKE_BINARY_DIR}" "${_pchFile}")
+            if (COTIRE_DEBUG)
+                message (STATUS "add_custom_command: OUTPUT ${_pchFile} ${_cmds} DEPENDS ${_prefixFile} IMPLICIT_DEPENDS ${_language} ${_prefixFile}")
+            endif()
+            set_property (SOURCE "${_pchFile}" PROPERTY GENERATED TRUE)
+            add_custom_command(
+                OUTPUT "${_pchFile}"
+                COMMAND ${_cmds}
+                DEPENDS "${_prefixFile}"
+                IMPLICIT_DEPENDS ${_language} "${_prefixFile}"
+                WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
+                COMMENT "Building ${_language} precompiled header ${_pchFileRelPath}"
+                VERBATIM)
+        endif()
+    endif()
 endfunction()

 function (cotire_setup_pch_file_inclusion _language _target _wholeTarget _prefixFile _pchFile _hostFile)
-	if (CMAKE_${_language}_COMPILER_ID MATCHES "MSVC|Intel")
-		# for Visual Studio and Intel, we include the precompiled header in all but the host file
-		# the host file does the precompiled header compilation, see cotire_setup_pch_file_compilation
-		set (_sourceFiles ${ARGN})
-		list (LENGTH _sourceFiles _numberOfSourceFiles)
-		if (_numberOfSourceFiles GREATER 0)
-			# mark sources as cotired to prevent them from being used in another cotired target
-			set_source_files_properties(${_sourceFiles} PROPERTIES COTIRE_TARGET "${_target}")
-			set (_flags "")
-			cotire_add_prefix_pch_inclusion_flags(
-				"${_language}" "${CMAKE_${_language}_COMPILER_ID}" "${CMAKE_${_language}_COMPILER_VERSION}"
-				"${_prefixFile}" "${_pchFile}" _flags)
-			set_property (SOURCE ${_sourceFiles} APPEND_STRING PROPERTY COMPILE_FLAGS " ${_flags} ")
-			# make object files generated from source files depend on precompiled header
-			set_property (SOURCE ${_sourceFiles} APPEND PROPERTY OBJECT_DEPENDS "${_pchFile}")
-		endif()
-	elseif ("${CMAKE_GENERATOR}" MATCHES "Make|Ninja")
-		set (_sourceFiles ${_hostFile} ${ARGN})
-		if (NOT _wholeTarget)
-			# for makefile based generator, we force the inclusion of the prefix header for a subset
-			# of the source files, if this is a multi-language target or has excluded files
-			set (_flags "")
-			cotire_add_prefix_pch_inclusion_flags(
-				"${_language}" "${CMAKE_${_language}_COMPILER_ID}" "${CMAKE_${_language}_COMPILER_VERSION}"
-				"${_prefixFile}" "${_pchFile}" _flags)
-			set_property (SOURCE ${_sourceFiles} APPEND_STRING PROPERTY COMPILE_FLAGS " ${_flags} ")
-			# mark sources as cotired to prevent them from being used in another cotired target
-			set_source_files_properties(${_sourceFiles} PROPERTIES COTIRE_TARGET "${_target}")
-		endif()
-		# make object files generated from source files depend on precompiled header
-		set_property (SOURCE ${_sourceFiles} APPEND PROPERTY OBJECT_DEPENDS "${_pchFile}")
-	endif()
+    if (CMAKE_${_language}_COMPILER_ID MATCHES "MSVC|Intel")
+        # for Visual Studio and Intel, we include the precompiled header in all but the host file
+        # the host file does the precompiled header compilation, see cotire_setup_pch_file_compilation
+        set (_sourceFiles ${ARGN})
+        list (LENGTH _sourceFiles _numberOfSourceFiles)
+        if (_numberOfSourceFiles GREATER 0)
+            # mark sources as cotired to prevent them from being used in another cotired target
+            set_source_files_properties(${_sourceFiles} PROPERTIES COTIRE_TARGET "${_target}")
+            set (_flags "")
+            cotire_add_prefix_pch_inclusion_flags(
+                "${_language}" "${CMAKE_${_language}_COMPILER_ID}" "${CMAKE_${_language}_COMPILER_VERSION}"
+                "${_prefixFile}" "${_pchFile}" _flags)
+            set_property (SOURCE ${_sourceFiles} APPEND_STRING PROPERTY COMPILE_FLAGS " ${_flags} ")
+            # make object files generated from source files depend on precompiled header
+            set_property (SOURCE ${_sourceFiles} APPEND PROPERTY OBJECT_DEPENDS "${_pchFile}")
+        endif()
+    elseif ("${CMAKE_GENERATOR}" MATCHES "Make|Ninja")
+        set (_sourceFiles ${_hostFile} ${ARGN})
+        if (NOT _wholeTarget)
+            # for makefile based generator, we force the inclusion of the prefix header for a subset
+            # of the source files, if this is a multi-language target or has excluded files
+            set (_flags "")
+            cotire_add_prefix_pch_inclusion_flags(
+                "${_language}" "${CMAKE_${_language}_COMPILER_ID}" "${CMAKE_${_language}_COMPILER_VERSION}"
+                "${_prefixFile}" "${_pchFile}" _flags)
+            set_property (SOURCE ${_sourceFiles} APPEND_STRING PROPERTY COMPILE_FLAGS " ${_flags} ")
+            # mark sources as cotired to prevent them from being used in another cotired target
+            set_source_files_properties(${_sourceFiles} PROPERTIES COTIRE_TARGET "${_target}")
+        endif()
+        # make object files generated from source files depend on precompiled header
+        set_property (SOURCE ${_sourceFiles} APPEND PROPERTY OBJECT_DEPENDS "${_pchFile}")
+    endif()
 endfunction()

 function (cotire_setup_prefix_file_inclusion _language _target _prefixFile)
-	set (_sourceFiles ${ARGN})
-	# force the inclusion of the prefix header for the given source files
-	set (_flags "")
-	set (_pchFile "")
-	cotire_add_prefix_pch_inclusion_flags(
-		"${_language}" "${CMAKE_${_language}_COMPILER_ID}" "${CMAKE_${_language}_COMPILER_VERSION}"
-		"${_prefixFile}" "${_pchFile}" _flags)
-	set_property (SOURCE ${_sourceFiles} APPEND_STRING PROPERTY COMPILE_FLAGS " ${_flags} ")
-	# mark sources as cotired to prevent them from being used in another cotired target
-	set_source_files_properties(${_sourceFiles} PROPERTIES COTIRE_TARGET "${_target}")
-	# make object files generated from source files depend on prefix header
-	set_property (SOURCE ${_sourceFiles} APPEND PROPERTY OBJECT_DEPENDS "${_prefixFile}")
+    set (_sourceFiles ${ARGN})
+    # force the inclusion of the prefix header for the given source files
+    set (_flags "")
+    set (_pchFile "")
+    cotire_add_prefix_pch_inclusion_flags(
+        "${_language}" "${CMAKE_${_language}_COMPILER_ID}" "${CMAKE_${_language}_COMPILER_VERSION}"
+        "${_prefixFile}" "${_pchFile}" _flags)
+    set_property (SOURCE ${_sourceFiles} APPEND_STRING PROPERTY COMPILE_FLAGS " ${_flags} ")
+    # mark sources as cotired to prevent them from being used in another cotired target
+    set_source_files_properties(${_sourceFiles} PROPERTIES COTIRE_TARGET "${_target}")
+    # make object files generated from source files depend on prefix header
+    set_property (SOURCE ${_sourceFiles} APPEND PROPERTY OBJECT_DEPENDS "${_prefixFile}")
 endfunction()

 function (cotire_get_first_set_property_value _propertyValueVar _type _object)
-	set (_properties ${ARGN})
-	foreach (_property ${_properties})
-		get_property(_propertyValue ${_type} "${_object}" PROPERTY ${_property})
-		if (_propertyValue)
-			set (${_propertyValueVar} ${_propertyValue} PARENT_SCOPE)
-			return()
-		endif()
-	endforeach()
-	set (${_propertyValueVar} "" PARENT_SCOPE)
+    set (_properties ${ARGN})
+    foreach (_property ${_properties})
+        get_property(_propertyValue ${_type} "${_object}" PROPERTY ${_property})
+        if (_propertyValue)
+            set (${_propertyValueVar} ${_propertyValue} PARENT_SCOPE)
+            return()
+        endif()
+    endforeach()
+    set (${_propertyValueVar} "" PARENT_SCOPE)
 endfunction()

 function (cotire_setup_combine_command _language _targetScript _joinedFile _cmdsVar)
-	set (_files ${ARGN})
-	set (_filesPaths "")
-	foreach (_file ${_files})
-		get_filename_component(_filePath "${_file}" ABSOLUTE)
-		list (APPEND _filesPaths "${_filePath}")
-	endforeach()
-	cotire_set_cmd_to_prologue(_prefixCmd)
-	list (APPEND _prefixCmd -P "${COTIRE_CMAKE_MODULE_FILE}" "combine")
-	if (_targetScript)
-		list (APPEND _prefixCmd "${_targetScript}")
-	endif()
-	list (APPEND _prefixCmd "${_joinedFile}" ${_filesPaths})
-	if (COTIRE_DEBUG)
-		message (STATUS "add_custom_command: OUTPUT ${_joinedFile} COMMAND ${_prefixCmd} DEPENDS ${_files}")
-	endif()
-	set_property (SOURCE "${_joinedFile}" PROPERTY GENERATED TRUE)
-	file (RELATIVE_PATH _joinedFileRelPath "${CMAKE_BINARY_DIR}" "${_joinedFile}")
-	get_filename_component(_joinedFileBaseName "${_joinedFile}" NAME_WE)
-	get_filename_component(_joinedFileExt "${_joinedFile}" EXT)
-	if (_language AND _joinedFileBaseName MATCHES "${COTIRE_UNITY_SOURCE_FILENAME_SUFFIX}$")
-		set (_comment "Generating ${_language} unity source ${_joinedFileRelPath}")
-	elseif (_language AND _joinedFileBaseName MATCHES "${COTIRE_PREFIX_HEADER_FILENAME_SUFFIX}$")
-		if (_joinedFileExt MATCHES "^\\.c")
-			set (_comment "Generating ${_language} prefix source ${_joinedFileRelPath}")
-		else()
-			set (_comment "Generating ${_language} prefix header ${_joinedFileRelPath}")
-		endif()
-	else()
-		set (_comment "Generating ${_joinedFileRelPath}")
-	endif()
-	add_custom_command(
-		OUTPUT "${_joinedFile}"
-		COMMAND ${_prefixCmd}
-		DEPENDS ${_files}
-		COMMENT "${_comment}"
-		WORKING_DIRECTORY "${CMAKE_BINARY_DIR}"
-		VERBATIM)
-	list (APPEND ${_cmdsVar} COMMAND ${_prefixCmd})
-	set (${_cmdsVar} ${${_cmdsVar}} PARENT_SCOPE)
+    set (_files ${ARGN})
+    set (_filesPaths "")
+    foreach (_file ${_files})
+        get_filename_component(_filePath "${_file}" ABSOLUTE)
+        list (APPEND _filesPaths "${_filePath}")
+    endforeach()
+    cotire_set_cmd_to_prologue(_prefixCmd)
+    list (APPEND _prefixCmd -P "${COTIRE_CMAKE_MODULE_FILE}" "combine")
+    if (_targetScript)
+        list (APPEND _prefixCmd "${_targetScript}")
+    endif()
+    list (APPEND _prefixCmd "${_joinedFile}" ${_filesPaths})
+    if (COTIRE_DEBUG)
+        message (STATUS "add_custom_command: OUTPUT ${_joinedFile} COMMAND ${_prefixCmd} DEPENDS ${_files}")
+    endif()
+    set_property (SOURCE "${_joinedFile}" PROPERTY GENERATED TRUE)
+    file (RELATIVE_PATH _joinedFileRelPath "${CMAKE_BINARY_DIR}" "${_joinedFile}")
+    get_filename_component(_joinedFileBaseName "${_joinedFile}" NAME_WE)
+    get_filename_component(_joinedFileExt "${_joinedFile}" EXT)
+    if (_language AND _joinedFileBaseName MATCHES "${COTIRE_UNITY_SOURCE_FILENAME_SUFFIX}$")
+        set (_comment "Generating ${_language} unity source ${_joinedFileRelPath}")
+    elseif (_language AND _joinedFileBaseName MATCHES "${COTIRE_PREFIX_HEADER_FILENAME_SUFFIX}$")
+        if (_joinedFileExt MATCHES "^\\.c")
+            set (_comment "Generating ${_language} prefix source ${_joinedFileRelPath}")
+        else()
+            set (_comment "Generating ${_language} prefix header ${_joinedFileRelPath}")
+        endif()
+    else()
+        set (_comment "Generating ${_joinedFileRelPath}")
+    endif()
+    add_custom_command(
+        OUTPUT "${_joinedFile}"
+        COMMAND ${_prefixCmd}
+        DEPENDS ${_files}
+        COMMENT "${_comment}"
+        WORKING_DIRECTORY "${CMAKE_BINARY_DIR}"
+        VERBATIM)
+    list (APPEND ${_cmdsVar} COMMAND ${_prefixCmd})
+    set (${_cmdsVar} ${${_cmdsVar}} PARENT_SCOPE)
 endfunction()

 function (cotire_setup_target_pch_usage _languages _target _wholeTarget)
-	if (XCODE)
-		# for Xcode, we attach a pre-build action to generate the unity sources and prefix headers
-		set (_prefixFiles "")
-		foreach (_language ${_languages})
-			get_property(_prefixFile TARGET ${_target} PROPERTY COTIRE_${_language}_PREFIX_HEADER)
-			if (_prefixFile)
-				list (APPEND _prefixFiles "${_prefixFile}")
-			endif()
-		endforeach()
-		set (_cmds ${ARGN})
-		list (LENGTH _prefixFiles _numberOfPrefixFiles)
-		if (_numberOfPrefixFiles GREATER 1)
-			# we also generate a generic, single prefix header which includes all language specific prefix headers
-			set (_language "")
-			set (_targetScript "")
-			cotire_make_prefix_file_path("${_language}" ${_target} _prefixHeader)
-			cotire_setup_combine_command("${_language}" "${_targetScript}" "${_prefixHeader}" _cmds ${_prefixFiles})
-		else()
-			set (_prefixHeader "${_prefixFiles}")
-		endif()
-		if (COTIRE_DEBUG)
-			message (STATUS "add_custom_command: TARGET ${_target} PRE_BUILD ${_cmds}")
-		endif()
-		# because CMake PRE_BUILD command does not support dependencies,
-		# we check dependencies explicity in cotire script mode when the pre-build action is run
-		add_custom_command(
-			TARGET "${_target}"
-			PRE_BUILD ${_cmds}
-			WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
-			COMMENT "Updating target ${_target} prefix headers"
-			VERBATIM)
-		# make Xcode precompile the generated prefix header with ProcessPCH and ProcessPCH++
-		set_target_properties(${_target} PROPERTIES XCODE_ATTRIBUTE_GCC_PRECOMPILE_PREFIX_HEADER "YES")
-		set_target_properties(${_target} PROPERTIES XCODE_ATTRIBUTE_GCC_PREFIX_HEADER "${_prefixHeader}")
-	elseif ("${CMAKE_GENERATOR}" MATCHES "Make|Ninja")
-		# for makefile based generator, we force inclusion of the prefix header for all target source files
-		# if this is a single-language target without any excluded files
-		if (_wholeTarget)
-			set (_language "${_languages}")
-			# for Visual Studio and Intel, precompiled header inclusion is always done on the source file level
-			# see cotire_setup_pch_file_inclusion
-			if (NOT CMAKE_${_language}_COMPILER_ID MATCHES "MSVC|Intel")
-				get_property(_prefixFile TARGET ${_target} PROPERTY COTIRE_${_language}_PREFIX_HEADER)
-				if (_prefixFile)
-					get_property(_pchFile TARGET ${_target} PROPERTY COTIRE_${_language}_PRECOMPILED_HEADER)
-					set (_options COMPILE_OPTIONS)
-					cotire_add_prefix_pch_inclusion_flags(
-						"${_language}" "${CMAKE_${_language}_COMPILER_ID}" "${CMAKE_${_language}_COMPILER_VERSION}"
-						"${_prefixFile}" "${_pchFile}" _options)
-					set_property(TARGET ${_target} APPEND PROPERTY ${_options})
-				endif()
-			endif()
-		endif()
-	endif()
+    if (XCODE)
+        # for Xcode, we attach a pre-build action to generate the unity sources and prefix headers
+        set (_prefixFiles "")
+        foreach (_language ${_languages})
+            get_property(_prefixFile TARGET ${_target} PROPERTY COTIRE_${_language}_PREFIX_HEADER)
+            if (_prefixFile)
+                list (APPEND _prefixFiles "${_prefixFile}")
+            endif()
+        endforeach()
+        set (_cmds ${ARGN})
+        list (LENGTH _prefixFiles _numberOfPrefixFiles)
+        if (_numberOfPrefixFiles GREATER 1)
+            # we also generate a generic, single prefix header which includes all language specific prefix headers
+            set (_language "")
+            set (_targetScript "")
+            cotire_make_prefix_file_path("${_language}" ${_target} _prefixHeader)
+            cotire_setup_combine_command("${_language}" "${_targetScript}" "${_prefixHeader}" _cmds ${_prefixFiles})
+        else()
+            set (_prefixHeader "${_prefixFiles}")
+        endif()
+        if (COTIRE_DEBUG)
+            message (STATUS "add_custom_command: TARGET ${_target} PRE_BUILD ${_cmds}")
+        endif()
+        # because CMake PRE_BUILD command does not support dependencies,
+        # we check dependencies explicity in cotire script mode when the pre-build action is run
+        add_custom_command(
+            TARGET "${_target}"
+            PRE_BUILD ${_cmds}
+            WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
+            COMMENT "Updating target ${_target} prefix headers"
+            VERBATIM)
+        # make Xcode precompile the generated prefix header with ProcessPCH and ProcessPCH++
+        set_target_properties(${_target} PROPERTIES XCODE_ATTRIBUTE_GCC_PRECOMPILE_PREFIX_HEADER "YES")
+        set_target_properties(${_target} PROPERTIES XCODE_ATTRIBUTE_GCC_PREFIX_HEADER "${_prefixHeader}")
+    elseif ("${CMAKE_GENERATOR}" MATCHES "Make|Ninja")
+        # for makefile based generator, we force inclusion of the prefix header for all target source files
+        # if this is a single-language target without any excluded files
+        if (_wholeTarget)
+            set (_language "${_languages}")
+            # for Visual Studio and Intel, precompiled header inclusion is always done on the source file level
+            # see cotire_setup_pch_file_inclusion
+            if (NOT CMAKE_${_language}_COMPILER_ID MATCHES "MSVC|Intel")
+                get_property(_prefixFile TARGET ${_target} PROPERTY COTIRE_${_language}_PREFIX_HEADER)
+                if (_prefixFile)
+                    get_property(_pchFile TARGET ${_target} PROPERTY COTIRE_${_language}_PRECOMPILED_HEADER)
+                    set (_options COMPILE_OPTIONS)
+                    cotire_add_prefix_pch_inclusion_flags(
+                        "${_language}" "${CMAKE_${_language}_COMPILER_ID}" "${CMAKE_${_language}_COMPILER_VERSION}"
+                        "${_prefixFile}" "${_pchFile}" _options)
+                    set_property(TARGET ${_target} APPEND PROPERTY ${_options})
+                endif()
+            endif()
+        endif()
+    endif()
 endfunction()

 function (cotire_setup_unity_generation_commands _language _target _targetScript _targetConfigScript _unityFiles _cmdsVar)
-	set (_dependencySources "")
-	cotire_get_unity_source_dependencies(${_language} ${_target} _dependencySources ${ARGN})
-	foreach (_unityFile ${_unityFiles})
-		set_property (SOURCE "${_unityFile}" PROPERTY GENERATED TRUE)
-		# set up compiled unity source dependencies via OBJECT_DEPENDS
-		# this ensures that missing source files are generated before the unity file is compiled
-		if (COTIRE_DEBUG AND _dependencySources)
-			message (STATUS "${_unityFile} OBJECT_DEPENDS ${_dependencySources}")
-		endif()
-		if (_dependencySources)
-			# the OBJECT_DEPENDS property requires a list of full paths
-			set (_objectDependsPaths "")
-			foreach (_sourceFile ${_dependencySources})
-				get_source_file_property(_sourceLocation "${_sourceFile}" LOCATION)
-				list (APPEND _objectDependsPaths "${_sourceLocation}")
-			endforeach()
-			set_property (SOURCE "${_unityFile}" PROPERTY OBJECT_DEPENDS ${_objectDependsPaths})
-		endif()
-		if (WIN32 AND CMAKE_${_language}_COMPILER_ID MATCHES "MSVC|Intel")
-			# unity file compilation results in potentially huge object file, thus use /bigobj by default unter MSVC and Windows Intel
-			set_property (SOURCE "${_unityFile}" APPEND_STRING PROPERTY COMPILE_FLAGS "/bigobj")
-		endif()
-		cotire_set_cmd_to_prologue(_unityCmd)
-		list (APPEND _unityCmd -P "${COTIRE_CMAKE_MODULE_FILE}" "unity" "${_targetConfigScript}" "${_unityFile}")
-		if (CMAKE_VERSION VERSION_LESS "3.1.0")
-			set (_unityCmdDepends "${_targetScript}")
-		else()
-			# CMake 3.1.0 supports generator expressions in arguments to DEPENDS
-			set (_unityCmdDepends "${_targetConfigScript}")
-		endif()
-		file (RELATIVE_PATH _unityFileRelPath "${CMAKE_BINARY_DIR}" "${_unityFile}")
-		if (COTIRE_DEBUG)
-			message (STATUS "add_custom_command: OUTPUT ${_unityFile} COMMAND ${_unityCmd} DEPENDS ${_unityCmdDepends}")
-		endif()
-		add_custom_command(
-			OUTPUT "${_unityFile}"
-			COMMAND ${_unityCmd}
-			DEPENDS ${_unityCmdDepends}
-			COMMENT "Generating ${_language} unity source ${_unityFileRelPath}"
-			WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
-			VERBATIM)
-		list (APPEND ${_cmdsVar} COMMAND ${_unityCmd})
-	endforeach()
-	list (LENGTH _unityFiles _numberOfUnityFiles)
-	if (_numberOfUnityFiles GREATER 1)
-		# create a joint unity file from all unity file segments
-		cotire_make_single_unity_source_file_path(${_language} ${_target} _unityFile)
-		cotire_setup_combine_command(${_language} "${_targetConfigScript}" "${_unityFile}" ${_cmdsVar} ${_unityFiles})
-	endif()
-	set (${_cmdsVar} ${${_cmdsVar}} PARENT_SCOPE)
-endfunction()
-
-function (cotire_setup_prefix_generation_command _language _target _targetScript _prefixFile _unityFile _cmdsVar)
-	set (_sourceFiles ${ARGN})
-	set (_dependencySources "")
-	cotire_get_prefix_header_dependencies(${_language} ${_target} _dependencySources ${_sourceFiles})
-	cotire_set_cmd_to_prologue(_prefixCmd)
-	list (APPEND _prefixCmd -P "${COTIRE_CMAKE_MODULE_FILE}" "prefix" "${_targetScript}" "${_prefixFile}" "${_unityFile}")
-	set_property (SOURCE "${_prefixFile}" PROPERTY GENERATED TRUE)
-	if (COTIRE_DEBUG)
-		message (STATUS "add_custom_command: OUTPUT ${_prefixFile} COMMAND ${_prefixCmd} DEPENDS ${_unityFile} ${_dependencySources}")
-	endif()
-	file (RELATIVE_PATH _prefixFileRelPath "${CMAKE_BINARY_DIR}" "${_prefixFile}")
-	get_filename_component(_prefixFileExt "${_prefixFile}" EXT)
-	if (_prefixFileExt MATCHES "^\\.c")
-		set (_comment "Generating ${_language} prefix source ${_prefixFileRelPath}")
-	else()
-		set (_comment "Generating ${_language} prefix header ${_prefixFileRelPath}")
-	endif()
-	add_custom_command(
-		OUTPUT "${_prefixFile}" "${_prefixFile}.log"
-		COMMAND ${_prefixCmd}
-		DEPENDS "${_unityFile}" ${_dependencySources}
-		COMMENT "${_comment}"
-		WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
-		VERBATIM)
-	list (APPEND ${_cmdsVar} COMMAND ${_prefixCmd})
-	set (${_cmdsVar} ${${_cmdsVar}} PARENT_SCOPE)
+    set (_dependencySources "")
+    cotire_get_unity_source_dependencies(${_language} ${_target} _dependencySources ${ARGN})
+    foreach (_unityFile ${_unityFiles})
+        set_property (SOURCE "${_unityFile}" PROPERTY GENERATED TRUE)
+        # set up compiled unity source dependencies via OBJECT_DEPENDS
+        # this ensures that missing source files are generated before the unity file is compiled
+        if (COTIRE_DEBUG AND _dependencySources)
+            message (STATUS "${_unityFile} OBJECT_DEPENDS ${_dependencySources}")
+        endif()
+        if (_dependencySources)
+            # the OBJECT_DEPENDS property requires a list of full paths
+            set (_objectDependsPaths "")
+            foreach (_sourceFile ${_dependencySources})
+                get_source_file_property(_sourceLocation "${_sourceFile}" LOCATION)
+                list (APPEND _objectDependsPaths "${_sourceLocation}")
+            endforeach()
+            set_property (SOURCE "${_unityFile}" PROPERTY OBJECT_DEPENDS ${_objectDependsPaths})
+        endif()
+        if (WIN32 AND CMAKE_${_language}_COMPILER_ID MATCHES "MSVC|Intel")
+            # unity file compilation results in potentially huge object file, thus use /bigobj by default unter MSVC and Windows Intel
+            set_property (SOURCE "${_unityFile}" APPEND_STRING PROPERTY COMPILE_FLAGS "/bigobj")
+        endif()
+        cotire_set_cmd_to_prologue(_unityCmd)
+        list (APPEND _unityCmd -P "${COTIRE_CMAKE_MODULE_FILE}" "unity" "${_targetConfigScript}" "${_unityFile}")
+        if (CMAKE_VERSION VERSION_LESS "3.1.0")
+            set (_unityCmdDepends "${_targetScript}")
+        else()
+            # CMake 3.1.0 supports generator expressions in arguments to DEPENDS
+            set (_unityCmdDepends "${_targetConfigScript}")
+        endif()
+        file (RELATIVE_PATH _unityFileRelPath "${CMAKE_BINARY_DIR}" "${_unityFile}")
+        if (COTIRE_DEBUG)
+            message (STATUS "add_custom_command: OUTPUT ${_unityFile} COMMAND ${_unityCmd} DEPENDS ${_unityCmdDepends}")
+        endif()
+        add_custom_command(
+            OUTPUT "${_unityFile}"
+            COMMAND ${_unityCmd}
+            DEPENDS ${_unityCmdDepends}
+            COMMENT "Generating ${_language} unity source ${_unityFileRelPath}"
+            WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
+            VERBATIM)
+        list (APPEND ${_cmdsVar} COMMAND ${_unityCmd})
+    endforeach()
+    set (${_cmdsVar} ${${_cmdsVar}} PARENT_SCOPE)
+endfunction()
+
+function (cotire_setup_prefix_generation_command _language _target _targetScript _prefixFile _unityFiles _cmdsVar)
+    set (_sourceFiles ${ARGN})
+    set (_dependencySources "")
+    cotire_get_prefix_header_dependencies(${_language} ${_target} _dependencySources ${_sourceFiles})
+    cotire_set_cmd_to_prologue(_prefixCmd)
+    list (APPEND _prefixCmd -P "${COTIRE_CMAKE_MODULE_FILE}" "prefix" "${_targetScript}" "${_prefixFile}" ${_unityFiles})
+    set_property (SOURCE "${_prefixFile}" PROPERTY GENERATED TRUE)
+    if (COTIRE_DEBUG)
+        message (STATUS "add_custom_command: OUTPUT ${_prefixFile} COMMAND ${_prefixCmd} DEPENDS ${_unityFile} ${_dependencySources}")
+    endif()
+    file (RELATIVE_PATH _prefixFileRelPath "${CMAKE_BINARY_DIR}" "${_prefixFile}")
+    get_filename_component(_prefixFileExt "${_prefixFile}" EXT)
+    if (_prefixFileExt MATCHES "^\\.c")
+        set (_comment "Generating ${_language} prefix source ${_prefixFileRelPath}")
+    else()
+        set (_comment "Generating ${_language} prefix header ${_prefixFileRelPath}")
+    endif()
+    # prevent pre-processing errors upon generating the prefix header when a target's generated include file does not yet exist
+    # we do not add a file-level dependency for the target's generated files though, because we only want to depend on their existence
+    # thus we make the prefix header generation depend on a custom helper target which triggers the generation of the files
+    set (_preTargetName "${_target}${COTIRE_PCH_TARGET_SUFFIX}_pre")
+    if (TARGET ${_preTargetName})
+        # custom helper target has already been generated while processing a different language
+        list (APPEND _dependencySources ${_preTargetName})
+    else()
+        get_target_property(_targetSourceFiles ${_target} SOURCES)
+        cotire_get_objects_with_property_on(_generatedSources GENERATED SOURCE ${_targetSourceFiles})
+        if (_generatedSources)
+            add_custom_target("${_preTargetName}" DEPENDS ${_generatedSources})
+            cotire_init_target("${_preTargetName}")
+            list (APPEND _dependencySources ${_preTargetName})
+        endif()
+    endif()
+    add_custom_command(
+        OUTPUT "${_prefixFile}" "${_prefixFile}.log"
+        COMMAND ${_prefixCmd}
+        DEPENDS ${_unityFiles} ${_dependencySources}
+        COMMENT "${_comment}"
+        WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
+        VERBATIM)
+    list (APPEND ${_cmdsVar} COMMAND ${_prefixCmd})
+    set (${_cmdsVar} ${${_cmdsVar}} PARENT_SCOPE)
 endfunction()

 function (cotire_setup_prefix_generation_from_unity_command _language _target _targetScript _prefixFile _unityFiles _cmdsVar)
-	set (_sourceFiles ${ARGN})
-	if (CMAKE_${_language}_COMPILER_ID MATCHES "GNU|Clang")
-		# GNU and Clang require indirect compilation of the prefix header to make them honor the system_header pragma
-		cotire_prefix_header_to_source_file_path(${_language} "${_prefixFile}" _prefixSourceFile)
-	else()
-		set (_prefixSourceFile "${_prefixFile}")
-	endif()
-	list (LENGTH _unityFiles _numberOfUnityFiles)
-	if (_numberOfUnityFiles GREATER 1)
-		cotire_make_single_unity_source_file_path(${_language} ${_target} _unityFile)
-		cotire_setup_prefix_generation_command(
-			${_language} ${_target} "${_targetScript}"
-			"${_prefixSourceFile}" "${_unityFile}" ${_cmdsVar} ${_sourceFiles})
-	else()
-		cotire_setup_prefix_generation_command(
-			${_language} ${_target} "${_targetScript}"
-			"${_prefixSourceFile}" "${_unityFiles}" ${_cmdsVar} ${_sourceFiles})
-	endif()
-	if (CMAKE_${_language}_COMPILER_ID MATCHES "GNU|Clang")
-		# set up generation of a prefix source file which includes the prefix header
-		cotire_setup_combine_command(${_language} "${_targetScript}" "${_prefixFile}" _cmds ${_prefixSourceFile})
-	endif()
-	set (${_cmdsVar} ${${_cmdsVar}} PARENT_SCOPE)
+    set (_sourceFiles ${ARGN})
+    if (CMAKE_${_language}_COMPILER_ID MATCHES "GNU|Clang")
+        # GNU and Clang require indirect compilation of the prefix header to make them honor the system_header pragma
+        cotire_prefix_header_to_source_file_path(${_language} "${_prefixFile}" _prefixSourceFile)
+    else()
+        set (_prefixSourceFile "${_prefixFile}")
+    endif()
+    cotire_setup_prefix_generation_command(
+        ${_language} ${_target} "${_targetScript}"
+        "${_prefixSourceFile}" "${_unityFiles}" ${_cmdsVar} ${_sourceFiles})
+    if (CMAKE_${_language}_COMPILER_ID MATCHES "GNU|Clang")
+        # set up generation of a prefix source file which includes the prefix header
+        cotire_setup_combine_command(${_language} "${_targetScript}" "${_prefixFile}" _cmds ${_prefixSourceFile})
+    endif()
+    set (${_cmdsVar} ${${_cmdsVar}} PARENT_SCOPE)
 endfunction()

 function (cotire_setup_prefix_generation_from_provided_command _language _target _targetScript _prefixFile _cmdsVar)
-	set (_prefixHeaderFiles ${ARGN})
-	if (CMAKE_${_language}_COMPILER_ID MATCHES "GNU|Clang")
-		# GNU and Clang require indirect compilation of the prefix header to make them honor the system_header pragma
-		cotire_prefix_header_to_source_file_path(${_language} "${_prefixFile}" _prefixSourceFile)
-	else()
-		set (_prefixSourceFile "${_prefixFile}")
-	endif()
-	cotire_setup_combine_command(${_language} "${_targetScript}" "${_prefixSourceFile}" _cmds ${_prefixHeaderFiles})
-	if (CMAKE_${_language}_COMPILER_ID MATCHES "GNU|Clang")
-		# set up generation of a prefix source file which includes the prefix header
-		cotire_setup_combine_command(${_language} "${_targetScript}" "${_prefixFile}" _cmds ${_prefixSourceFile})
-	endif()
-	set (${_cmdsVar} ${${_cmdsVar}} PARENT_SCOPE)
+    set (_prefixHeaderFiles ${ARGN})
+    if (CMAKE_${_language}_COMPILER_ID MATCHES "GNU|Clang")
+        # GNU and Clang require indirect compilation of the prefix header to make them honor the system_header pragma
+        cotire_prefix_header_to_source_file_path(${_language} "${_prefixFile}" _prefixSourceFile)
+    else()
+        set (_prefixSourceFile "${_prefixFile}")
+    endif()
+    cotire_setup_combine_command(${_language} "${_targetScript}" "${_prefixSourceFile}" _cmds ${_prefixHeaderFiles})
+    if (CMAKE_${_language}_COMPILER_ID MATCHES "GNU|Clang")
+        # set up generation of a prefix source file which includes the prefix header
+        cotire_setup_combine_command(${_language} "${_targetScript}" "${_prefixFile}" _cmds ${_prefixSourceFile})
+    endif()
+    set (${_cmdsVar} ${${_cmdsVar}} PARENT_SCOPE)
 endfunction()

 function (cotire_init_cotire_target_properties _target)
-	get_property(_isSet TARGET ${_target} PROPERTY COTIRE_ENABLE_PRECOMPILED_HEADER SET)
-	if (NOT _isSet)
-		set_property(TARGET ${_target} PROPERTY COTIRE_ENABLE_PRECOMPILED_HEADER TRUE)
-	endif()
-	get_property(_isSet TARGET ${_target} PROPERTY COTIRE_ADD_UNITY_BUILD SET)
-	if (NOT _isSet)
-		set_property(TARGET ${_target} PROPERTY COTIRE_ADD_UNITY_BUILD TRUE)
-	endif()
-	get_property(_isSet TARGET ${_target} PROPERTY COTIRE_ADD_CLEAN SET)
-	if (NOT _isSet)
-		set_property(TARGET ${_target} PROPERTY COTIRE_ADD_CLEAN FALSE)
-	endif()
-	get_property(_isSet TARGET ${_target} PROPERTY COTIRE_PREFIX_HEADER_IGNORE_PATH SET)
-	if (NOT _isSet)
-		set_property(TARGET ${_target} PROPERTY COTIRE_PREFIX_HEADER_IGNORE_PATH "${CMAKE_SOURCE_DIR}")
-		cotire_check_is_path_relative_to("${CMAKE_BINARY_DIR}" _isRelative "${CMAKE_SOURCE_DIR}")
-		if (NOT _isRelative)
-			set_property(TARGET ${_target} APPEND PROPERTY COTIRE_PREFIX_HEADER_IGNORE_PATH "${CMAKE_BINARY_DIR}")
-		endif()
-	endif()
-	get_property(_isSet TARGET ${_target} PROPERTY COTIRE_PREFIX_HEADER_INCLUDE_PATH SET)
-	if (NOT _isSet)
-		set_property(TARGET ${_target} PROPERTY COTIRE_PREFIX_HEADER_INCLUDE_PATH "")
-	endif()
-	get_property(_isSet TARGET ${_target} PROPERTY COTIRE_PREFIX_HEADER_INCLUDE_PRIORITY_PATH SET)
-	if (NOT _isSet)
-		set_property(TARGET ${_target} PROPERTY COTIRE_PREFIX_HEADER_INCLUDE_PRIORITY_PATH "")
-	endif()
-	get_property(_isSet TARGET ${_target} PROPERTY COTIRE_UNITY_SOURCE_PRE_UNDEFS SET)
-	if (NOT _isSet)
-		set_property(TARGET ${_target} PROPERTY COTIRE_UNITY_SOURCE_PRE_UNDEFS "")
-	endif()
-	get_property(_isSet TARGET ${_target} PROPERTY COTIRE_UNITY_SOURCE_POST_UNDEFS SET)
-	if (NOT _isSet)
-		set_property(TARGET ${_target} PROPERTY COTIRE_UNITY_SOURCE_POST_UNDEFS "")
-	endif()
-	get_property(_isSet TARGET ${_target} PROPERTY COTIRE_UNITY_LINK_LIBRARIES_INIT SET)
-	if (NOT _isSet)
-		set_property(TARGET ${_target} PROPERTY COTIRE_UNITY_LINK_LIBRARIES_INIT "COPY_UNITY")
-	endif()
-	get_property(_isSet TARGET ${_target} PROPERTY COTIRE_UNITY_SOURCE_MAXIMUM_NUMBER_OF_INCLUDES SET)
-	if (NOT _isSet)
-		if (COTIRE_MAXIMUM_NUMBER_OF_UNITY_INCLUDES)
-			set_property(TARGET ${_target} PROPERTY COTIRE_UNITY_SOURCE_MAXIMUM_NUMBER_OF_INCLUDES "${COTIRE_MAXIMUM_NUMBER_OF_UNITY_INCLUDES}")
-		else()
-			set_property(TARGET ${_target} PROPERTY COTIRE_UNITY_SOURCE_MAXIMUM_NUMBER_OF_INCLUDES "")
-		endif()
-	endif()
+    get_property(_isSet TARGET ${_target} PROPERTY COTIRE_ENABLE_PRECOMPILED_HEADER SET)
+    if (NOT _isSet)
+        set_property(TARGET ${_target} PROPERTY COTIRE_ENABLE_PRECOMPILED_HEADER TRUE)
+    endif()
+    get_property(_isSet TARGET ${_target} PROPERTY COTIRE_ADD_UNITY_BUILD SET)
+    if (NOT _isSet)
+        set_property(TARGET ${_target} PROPERTY COTIRE_ADD_UNITY_BUILD TRUE)
+    endif()
+    get_property(_isSet TARGET ${_target} PROPERTY COTIRE_ADD_CLEAN SET)
+    if (NOT _isSet)
+        set_property(TARGET ${_target} PROPERTY COTIRE_ADD_CLEAN FALSE)
+    endif()
+    get_property(_isSet TARGET ${_target} PROPERTY COTIRE_PREFIX_HEADER_IGNORE_PATH SET)
+    if (NOT _isSet)
+        set_property(TARGET ${_target} PROPERTY COTIRE_PREFIX_HEADER_IGNORE_PATH "${CMAKE_SOURCE_DIR}")
+        cotire_check_is_path_relative_to("${CMAKE_BINARY_DIR}" _isRelative "${CMAKE_SOURCE_DIR}")
+        if (NOT _isRelative)
+            set_property(TARGET ${_target} APPEND PROPERTY COTIRE_PREFIX_HEADER_IGNORE_PATH "${CMAKE_BINARY_DIR}")
+        endif()
+    endif()
+    get_property(_isSet TARGET ${_target} PROPERTY COTIRE_PREFIX_HEADER_INCLUDE_PATH SET)
+    if (NOT _isSet)
+        set_property(TARGET ${_target} PROPERTY COTIRE_PREFIX_HEADER_INCLUDE_PATH "")
+    endif()
+    get_property(_isSet TARGET ${_target} PROPERTY COTIRE_PREFIX_HEADER_INCLUDE_PRIORITY_PATH SET)
+    if (NOT _isSet)
+        set_property(TARGET ${_target} PROPERTY COTIRE_PREFIX_HEADER_INCLUDE_PRIORITY_PATH "")
+    endif()
+    get_property(_isSet TARGET ${_target} PROPERTY COTIRE_UNITY_SOURCE_PRE_UNDEFS SET)
+    if (NOT _isSet)
+        set_property(TARGET ${_target} PROPERTY COTIRE_UNITY_SOURCE_PRE_UNDEFS "")
+    endif()
+    get_property(_isSet TARGET ${_target} PROPERTY COTIRE_UNITY_SOURCE_POST_UNDEFS SET)
+    if (NOT _isSet)
+        set_property(TARGET ${_target} PROPERTY COTIRE_UNITY_SOURCE_POST_UNDEFS "")
+    endif()
+    get_property(_isSet TARGET ${_target} PROPERTY COTIRE_UNITY_LINK_LIBRARIES_INIT SET)
+    if (NOT _isSet)
+        set_property(TARGET ${_target} PROPERTY COTIRE_UNITY_LINK_LIBRARIES_INIT "COPY_UNITY")
+    endif()
+    get_property(_isSet TARGET ${_target} PROPERTY COTIRE_UNITY_SOURCE_MAXIMUM_NUMBER_OF_INCLUDES SET)
+    if (NOT _isSet)
+        if (COTIRE_MAXIMUM_NUMBER_OF_UNITY_INCLUDES)
+            set_property(TARGET ${_target} PROPERTY COTIRE_UNITY_SOURCE_MAXIMUM_NUMBER_OF_INCLUDES "${COTIRE_MAXIMUM_NUMBER_OF_UNITY_INCLUDES}")
+        else()
+            set_property(TARGET ${_target} PROPERTY COTIRE_UNITY_SOURCE_MAXIMUM_NUMBER_OF_INCLUDES "")
+        endif()
+    endif()
 endfunction()

 function (cotire_make_target_message _target _languages _disableMsg _targetMsgVar)
-	get_target_property(_targetUsePCH ${_target} COTIRE_ENABLE_PRECOMPILED_HEADER)
-	get_target_property(_targetAddSCU ${_target} COTIRE_ADD_UNITY_BUILD)
-	string (REPLACE ";" " " _languagesStr "${_languages}")
-	math (EXPR _numberOfExcludedFiles "${ARGC} - 4")
-	if (_numberOfExcludedFiles EQUAL 0)
-		set (_excludedStr "")
-	elseif (COTIRE_VERBOSE OR _numberOfExcludedFiles LESS 4)
-		string (REPLACE ";" ", " _excludedStr "excluding ${ARGN}")
-	else()
-		set (_excludedStr "excluding ${_numberOfExcludedFiles} files")
-	endif()
-	set (_targetMsg "")
-	if (NOT _languages)
-		set (_targetMsg "Target ${_target} cannot be cotired.")
-		if (_disableMsg)
-			set (_targetMsg "${_targetMsg} ${_disableMsg}")
-		endif()
-	elseif (NOT _targetUsePCH AND NOT _targetAddSCU)
-		set (_targetMsg "${_languagesStr} target ${_target} cotired without unity build and precompiled header.")
-		if (_disableMsg)
-			set (_targetMsg "${_targetMsg} ${_disableMsg}")
-		endif()
-	elseif (NOT _targetUsePCH)
-		if (_excludedStr)
-			set (_targetMsg "${_languagesStr} target ${_target} cotired without precompiled header ${_excludedStr}.")
-		else()
-			set (_targetMsg "${_languagesStr} target ${_target} cotired without precompiled header.")
-		endif()
-		if (_disableMsg)
-			set (_targetMsg "${_targetMsg} ${_disableMsg}")
-		endif()
-	elseif (NOT _targetAddSCU)
-		if (_excludedStr)
-			set (_targetMsg "${_languagesStr} target ${_target} cotired without unity build ${_excludedStr}.")
-		else()
-			set (_targetMsg "${_languagesStr} target ${_target} cotired without unity build.")
-		endif()
-	else()
-		if (_excludedStr)
-			set (_targetMsg "${_languagesStr} target ${_target} cotired ${_excludedStr}.")
-		else()
-			set (_targetMsg "${_languagesStr} target ${_target} cotired.")
-		endif()
-	endif()
-	set (${_targetMsgVar} "${_targetMsg}" PARENT_SCOPE)
+    get_target_property(_targetUsePCH ${_target} COTIRE_ENABLE_PRECOMPILED_HEADER)
+    get_target_property(_targetAddSCU ${_target} COTIRE_ADD_UNITY_BUILD)
+    string (REPLACE ";" " " _languagesStr "${_languages}")
+    math (EXPR _numberOfExcludedFiles "${ARGC} - 4")
+    if (_numberOfExcludedFiles EQUAL 0)
+        set (_excludedStr "")
+    elseif (COTIRE_VERBOSE OR _numberOfExcludedFiles LESS 4)
+        string (REPLACE ";" ", " _excludedStr "excluding ${ARGN}")
+    else()
+        set (_excludedStr "excluding ${_numberOfExcludedFiles} files")
+    endif()
+    set (_targetMsg "")
+    if (NOT _languages)
+        set (_targetMsg "Target ${_target} cannot be cotired.")
+        if (_disableMsg)
+            set (_targetMsg "${_targetMsg} ${_disableMsg}")
+        endif()
+    elseif (NOT _targetUsePCH AND NOT _targetAddSCU)
+        set (_targetMsg "${_languagesStr} target ${_target} cotired without unity build and precompiled header.")
+        if (_disableMsg)
+            set (_targetMsg "${_targetMsg} ${_disableMsg}")
+        endif()
+    elseif (NOT _targetUsePCH)
+        if (_excludedStr)
+            set (_targetMsg "${_languagesStr} target ${_target} cotired without precompiled header ${_excludedStr}.")
+        else()
+            set (_targetMsg "${_languagesStr} target ${_target} cotired without precompiled header.")
+        endif()
+        if (_disableMsg)
+            set (_targetMsg "${_targetMsg} ${_disableMsg}")
+        endif()
+    elseif (NOT _targetAddSCU)
+        if (_excludedStr)
+            set (_targetMsg "${_languagesStr} target ${_target} cotired without unity build ${_excludedStr}.")
+        else()
+            set (_targetMsg "${_languagesStr} target ${_target} cotired without unity build.")
+        endif()
+    else()
+        if (_excludedStr)
+            set (_targetMsg "${_languagesStr} target ${_target} cotired ${_excludedStr}.")
+        else()
+            set (_targetMsg "${_languagesStr} target ${_target} cotired.")
+        endif()
+    endif()
+    set (${_targetMsgVar} "${_targetMsg}" PARENT_SCOPE)
 endfunction()

 function (cotire_choose_target_languages _target _targetLanguagesVar _wholeTargetVar)
-	set (_languages ${ARGN})
-	set (_allSourceFiles "")
-	set (_allExcludedSourceFiles "")
-	set (_allCotiredSourceFiles "")
-	set (_targetLanguages "")
-	set (_pchEligibleTargetLanguages "")
-	get_target_property(_targetType ${_target} TYPE)
-	get_target_property(_targetSourceFiles ${_target} SOURCES)
-	get_target_property(_targetUsePCH ${_target} COTIRE_ENABLE_PRECOMPILED_HEADER)
-	get_target_property(_targetAddSCU ${_target} COTIRE_ADD_UNITY_BUILD)
-	set (_disableMsg "")
-	foreach (_language ${_languages})
-		get_target_property(_prefixHeader ${_target} COTIRE_${_language}_PREFIX_HEADER)
-		get_target_property(_unityBuildFile ${_target} COTIRE_${_language}_UNITY_SOURCE)
-		if (_prefixHeader OR _unityBuildFile)
-			message (STATUS "cotire: target ${_target} has already been cotired.")
-			set (${_targetLanguagesVar} "" PARENT_SCOPE)
-			return()
-		endif()
-		if (_targetUsePCH AND "${_language}" MATCHES "^C|CXX$")
-			cotire_check_precompiled_header_support("${_language}" "${_target}" _disableMsg)
-			if (_disableMsg)
-				set (_targetUsePCH FALSE)
-			endif()
-		endif()
-		set (_sourceFiles "")
-		set (_excludedSources "")
-		set (_cotiredSources "")
-		cotire_filter_language_source_files(${_language} ${_target} _sourceFiles _excludedSources _cotiredSources ${_targetSourceFiles})
-		if (_sourceFiles OR _excludedSources OR _cotiredSources)
-			list (APPEND _targetLanguages ${_language})
-		endif()
-		if (_sourceFiles)
-			list (APPEND _allSourceFiles ${_sourceFiles})
-		endif()
-		list (LENGTH _sourceFiles _numberOfSources)
-		if (NOT _numberOfSources LESS ${COTIRE_MINIMUM_NUMBER_OF_TARGET_SOURCES})
-			list (APPEND _pchEligibleTargetLanguages ${_language})
-		endif()
-		if (_excludedSources)
-			list (APPEND _allExcludedSourceFiles ${_excludedSources})
-		endif()
-		if (_cotiredSources)
-			list (APPEND _allCotiredSourceFiles ${_cotiredSources})
-		endif()
-	endforeach()
-	set (_targetMsgLevel STATUS)
-	if (NOT _targetLanguages)
-		string (REPLACE ";" " or " _languagesStr "${_languages}")
-		set (_disableMsg "No ${_languagesStr} source files.")
-		set (_targetUsePCH FALSE)
-		set (_targetAddSCU FALSE)
-	endif()
-	if (_targetUsePCH)
-		if (_allCotiredSourceFiles)
-			cotire_get_source_file_property_values(_cotireTargets COTIRE_TARGET ${_allCotiredSourceFiles})
-			list (REMOVE_DUPLICATES _cotireTargets)
-			string (REPLACE ";" ", " _cotireTargetsStr "${_cotireTargets}")
-			set (_disableMsg "Target sources already include a precompiled header for target(s) ${_cotireTargets}.")
-			set (_disableMsg "${_disableMsg} Set target property COTIRE_ENABLE_PRECOMPILED_HEADER to FALSE for targets ${_target},")
-			set (_disableMsg "${_disableMsg} ${_cotireTargetsStr} to get a workable build system.")
-			set (_targetMsgLevel SEND_ERROR)
-			set (_targetUsePCH FALSE)
-		elseif (NOT _pchEligibleTargetLanguages)
-			set (_disableMsg "Too few applicable sources.")
-			set (_targetUsePCH FALSE)
-		elseif (XCODE AND _allExcludedSourceFiles)
-			# for Xcode, we cannot apply the precompiled header to individual sources, only to the whole target
-			set (_disableMsg "Exclusion of source files not supported for generator Xcode.")
-			set (_targetUsePCH FALSE)
-		elseif (XCODE AND "${_targetType}" STREQUAL "OBJECT_LIBRARY")
-			# for Xcode, we cannot apply the required PRE_BUILD action to generate the prefix header to an OBJECT_LIBRARY target
-			set (_disableMsg "Required PRE_BUILD action not supported for OBJECT_LIBRARY targets for generator Xcode.")
-			set (_targetUsePCH FALSE)
-		endif()
-	endif()
-	set_property(TARGET ${_target} PROPERTY COTIRE_ENABLE_PRECOMPILED_HEADER ${_targetUsePCH})
-	set_property(TARGET ${_target} PROPERTY COTIRE_ADD_UNITY_BUILD ${_targetAddSCU})
-	cotire_make_target_message(${_target} "${_targetLanguages}" "${_disableMsg}" _targetMsg ${_allExcludedSourceFiles})
-	if (_targetMsg)
-		if (NOT DEFINED COTIREMSG_${_target})
-			set (COTIREMSG_${_target} "")
-		endif()
-		if (COTIRE_VERBOSE OR NOT "${_targetMsgLevel}" STREQUAL "STATUS" OR
-			NOT "${COTIREMSG_${_target}}" STREQUAL "${_targetMsg}")
-			# cache message to avoid redundant messages on re-configure
-			set (COTIREMSG_${_target} "${_targetMsg}" CACHE INTERNAL "${_target} cotire message.")
-			message (${_targetMsgLevel} "${_targetMsg}")
-		endif()
-	endif()
-	list (LENGTH _targetLanguages _numberOfLanguages)
-	if (_numberOfLanguages GREATER 1 OR _allExcludedSourceFiles)
-		set (${_wholeTargetVar} FALSE PARENT_SCOPE)
-	else()
-		set (${_wholeTargetVar} TRUE PARENT_SCOPE)
-	endif()
-	set (${_targetLanguagesVar} ${_targetLanguages} PARENT_SCOPE)
+    set (_languages ${ARGN})
+    set (_allSourceFiles "")
+    set (_allExcludedSourceFiles "")
+    set (_allCotiredSourceFiles "")
+    set (_targetLanguages "")
+    set (_pchEligibleTargetLanguages "")
+    get_target_property(_targetType ${_target} TYPE)
+    get_target_property(_targetSourceFiles ${_target} SOURCES)
+    get_target_property(_targetUsePCH ${_target} COTIRE_ENABLE_PRECOMPILED_HEADER)
+    get_target_property(_targetAddSCU ${_target} COTIRE_ADD_UNITY_BUILD)
+    set (_disableMsg "")
+    foreach (_language ${_languages})
+        get_target_property(_prefixHeader ${_target} COTIRE_${_language}_PREFIX_HEADER)
+        get_target_property(_unityBuildFile ${_target} COTIRE_${_language}_UNITY_SOURCE)
+        if (_prefixHeader OR _unityBuildFile)
+            message (STATUS "cotire: target ${_target} has already been cotired.")
+            set (${_targetLanguagesVar} "" PARENT_SCOPE)
+            return()
+        endif()
+        if (_targetUsePCH AND "${_language}" MATCHES "^C|CXX$")
+            cotire_check_precompiled_header_support("${_language}" "${_target}" _disableMsg)
+            if (_disableMsg)
+                set (_targetUsePCH FALSE)
+            endif()
+        endif()
+        set (_sourceFiles "")
+        set (_excludedSources "")
+        set (_cotiredSources "")
+        cotire_filter_language_source_files(${_language} ${_target} _sourceFiles _excludedSources _cotiredSources ${_targetSourceFiles})
+        if (_sourceFiles OR _excludedSources OR _cotiredSources)
+            list (APPEND _targetLanguages ${_language})
+        endif()
+        if (_sourceFiles)
+            list (APPEND _allSourceFiles ${_sourceFiles})
+        endif()
+        list (LENGTH _sourceFiles _numberOfSources)
+        if (NOT _numberOfSources LESS ${COTIRE_MINIMUM_NUMBER_OF_TARGET_SOURCES})
+            list (APPEND _pchEligibleTargetLanguages ${_language})
+        endif()
+        if (_excludedSources)
+            list (APPEND _allExcludedSourceFiles ${_excludedSources})
+        endif()
+        if (_cotiredSources)
+            list (APPEND _allCotiredSourceFiles ${_cotiredSources})
+        endif()
+    endforeach()
+    set (_targetMsgLevel STATUS)
+    if (NOT _targetLanguages)
+        string (REPLACE ";" " or " _languagesStr "${_languages}")
+        set (_disableMsg "No ${_languagesStr} source files.")
+        set (_targetUsePCH FALSE)
+        set (_targetAddSCU FALSE)
+    endif()
+    if (_targetUsePCH)
+        if (_allCotiredSourceFiles)
+            cotire_get_source_file_property_values(_cotireTargets COTIRE_TARGET ${_allCotiredSourceFiles})
+            list (REMOVE_DUPLICATES _cotireTargets)
+            string (REPLACE ";" ", " _cotireTargetsStr "${_cotireTargets}")
+            set (_disableMsg "Target sources already include a precompiled header for target(s) ${_cotireTargets}.")
+            set (_disableMsg "${_disableMsg} Set target property COTIRE_ENABLE_PRECOMPILED_HEADER to FALSE for targets ${_target},")
+            set (_disableMsg "${_disableMsg} ${_cotireTargetsStr} to get a workable build system.")
+            set (_targetMsgLevel SEND_ERROR)
+            set (_targetUsePCH FALSE)
+        elseif (NOT _pchEligibleTargetLanguages)
+            set (_disableMsg "Too few applicable sources.")
+            set (_targetUsePCH FALSE)
+        elseif (XCODE AND _allExcludedSourceFiles)
+            # for Xcode, we cannot apply the precompiled header to individual sources, only to the whole target
+            set (_disableMsg "Exclusion of source files not supported for generator Xcode.")
+            set (_targetUsePCH FALSE)
+        elseif (XCODE AND "${_targetType}" STREQUAL "OBJECT_LIBRARY")
+            # for Xcode, we cannot apply the required PRE_BUILD action to generate the prefix header to an OBJECT_LIBRARY target
+            set (_disableMsg "Required PRE_BUILD action not supported for OBJECT_LIBRARY targets for generator Xcode.")
+            set (_targetUsePCH FALSE)
+        endif()
+    endif()
+    set_property(TARGET ${_target} PROPERTY COTIRE_ENABLE_PRECOMPILED_HEADER ${_targetUsePCH})
+    set_property(TARGET ${_target} PROPERTY COTIRE_ADD_UNITY_BUILD ${_targetAddSCU})
+    cotire_make_target_message(${_target} "${_targetLanguages}" "${_disableMsg}" _targetMsg ${_allExcludedSourceFiles})
+    if (_targetMsg)
+        if (NOT DEFINED COTIREMSG_${_target})
+            set (COTIREMSG_${_target} "")
+        endif()
+        if (COTIRE_VERBOSE OR NOT "${_targetMsgLevel}" STREQUAL "STATUS" OR
+            NOT "${COTIREMSG_${_target}}" STREQUAL "${_targetMsg}")
+            # cache message to avoid redundant messages on re-configure
+            set (COTIREMSG_${_target} "${_targetMsg}" CACHE INTERNAL "${_target} cotire message.")
+            message (${_targetMsgLevel} "${_targetMsg}")
+        endif()
+    endif()
+    list (LENGTH _targetLanguages _numberOfLanguages)
+    if (_numberOfLanguages GREATER 1 OR _allExcludedSourceFiles)
+        set (${_wholeTargetVar} FALSE PARENT_SCOPE)
+    else()
+        set (${_wholeTargetVar} TRUE PARENT_SCOPE)
+    endif()
+    set (${_targetLanguagesVar} ${_targetLanguages} PARENT_SCOPE)
 endfunction()

 function (cotire_compute_unity_max_number_of_includes _target _maxIncludesVar)
-	set (_sourceFiles ${ARGN})
-	get_target_property(_maxIncludes ${_target} COTIRE_UNITY_SOURCE_MAXIMUM_NUMBER_OF_INCLUDES)
-	if (_maxIncludes MATCHES "(-j|--parallel|--jobs) ?([0-9]*)")
-		set (_numberOfThreads "${CMAKE_MATCH_2}")
-		if (NOT _numberOfThreads)
-			# use all available cores
-			ProcessorCount(_numberOfThreads)
-		endif()
-		list (LENGTH _sourceFiles _numberOfSources)
-		math (EXPR _maxIncludes "(${_numberOfSources} + ${_numberOfThreads} - 1) / ${_numberOfThreads}")
-	elseif (NOT _maxIncludes MATCHES "[0-9]+")
-		set (_maxIncludes 0)
-	endif()
-	if (COTIRE_DEBUG)
-		message (STATUS "${_target} unity source max includes: ${_maxIncludes}")
-	endif()
-	set (${_maxIncludesVar} ${_maxIncludes} PARENT_SCOPE)
+    set (_sourceFiles ${ARGN})
+    get_target_property(_maxIncludes ${_target} COTIRE_UNITY_SOURCE_MAXIMUM_NUMBER_OF_INCLUDES)
+    if (_maxIncludes MATCHES "(-j|--parallel|--jobs) ?([0-9]*)")
+        set (_numberOfThreads "${CMAKE_MATCH_2}")
+        if (NOT _numberOfThreads)
+            # use all available cores
+            ProcessorCount(_numberOfThreads)
+        endif()
+        list (LENGTH _sourceFiles _numberOfSources)
+        math (EXPR _maxIncludes "(${_numberOfSources} + ${_numberOfThreads} - 1) / ${_numberOfThreads}")
+    elseif (NOT _maxIncludes MATCHES "[0-9]+")
+        set (_maxIncludes 0)
+    endif()
+    if (COTIRE_DEBUG)
+        message (STATUS "${_target} unity source max includes: ${_maxIncludes}")
+    endif()
+    set (${_maxIncludesVar} ${_maxIncludes} PARENT_SCOPE)
 endfunction()

 function (cotire_process_target_language _language _configurations _target _wholeTarget _cmdsVar)
-	set (${_cmdsVar} "" PARENT_SCOPE)
-	get_target_property(_targetSourceFiles ${_target} SOURCES)
-	set (_sourceFiles "")
-	set (_excludedSources "")
-	set (_cotiredSources "")
-	cotire_filter_language_source_files(${_language} ${_target} _sourceFiles _excludedSources _cotiredSources ${_targetSourceFiles})
-	if (NOT _sourceFiles AND NOT _cotiredSources)
-		return()
-	endif()
-	set (_cmds "")
-	# check for user provided unity source file list
-	get_property(_unitySourceFiles TARGET ${_target} PROPERTY COTIRE_${_language}_UNITY_SOURCE_INIT)
-	if (NOT _unitySourceFiles)
-		set (_unitySourceFiles ${_sourceFiles} ${_cotiredSources})
-	endif()
-	cotire_generate_target_script(
-		${_language} "${_configurations}" ${_target} _targetScript _targetConfigScript ${_unitySourceFiles})
-	cotire_compute_unity_max_number_of_includes(${_target} _maxIncludes ${_unitySourceFiles})
-	cotire_make_unity_source_file_paths(${_language} ${_target} ${_maxIncludes} _unityFiles ${_unitySourceFiles})
-	if (NOT _unityFiles)
-		return()
-	endif()
-	cotire_setup_unity_generation_commands(
-		${_language} ${_target} "${_targetScript}" "${_targetConfigScript}" "${_unityFiles}" _cmds ${_unitySourceFiles})
-	cotire_make_prefix_file_path(${_language} ${_target} _prefixFile)
-	if (_prefixFile)
-		# check for user provided prefix header files
-		get_property(_prefixHeaderFiles TARGET ${_target} PROPERTY COTIRE_${_language}_PREFIX_HEADER_INIT)
-		if (_prefixHeaderFiles)
-			cotire_setup_prefix_generation_from_provided_command(
-				${_language} ${_target} "${_targetConfigScript}" "${_prefixFile}" _cmds ${_prefixHeaderFiles})
-		else()
-			cotire_setup_prefix_generation_from_unity_command(
-				${_language} ${_target} "${_targetConfigScript}" "${_prefixFile}" "${_unityFiles}" _cmds ${_unitySourceFiles})
-		endif()
-		# check if selected language has enough sources at all
-		list (LENGTH _sourceFiles _numberOfSources)
-		if (_numberOfSources LESS ${COTIRE_MINIMUM_NUMBER_OF_TARGET_SOURCES})
-			set (_targetUsePCH FALSE)
-		else()
-			get_target_property(_targetUsePCH ${_target} COTIRE_ENABLE_PRECOMPILED_HEADER)
-		endif()
-		if (_targetUsePCH)
-			cotire_make_pch_file_path(${_language} ${_target} _pchFile)
-			if (_pchFile)
-				# first file in _sourceFiles is passed as the host file
-				cotire_setup_pch_file_compilation(
-					${_language} ${_target} "${_targetConfigScript}" "${_prefixFile}" "${_pchFile}" ${_sourceFiles})
-				cotire_setup_pch_file_inclusion(
-					${_language} ${_target} ${_wholeTarget} "${_prefixFile}" "${_pchFile}" ${_sourceFiles})
-			endif()
-		elseif (_prefixHeaderFiles)
-			# user provided prefix header must be included unconditionally
-			cotire_setup_prefix_file_inclusion(${_language} ${_target} "${_prefixFile}" ${_sourceFiles})
-		endif()
-	endif()
-	# mark target as cotired for language
-	set_property(TARGET ${_target} PROPERTY COTIRE_${_language}_UNITY_SOURCE "${_unityFiles}")
-	if (_prefixFile)
-		set_property(TARGET ${_target} PROPERTY COTIRE_${_language}_PREFIX_HEADER "${_prefixFile}")
-		if (_targetUsePCH AND _pchFile)
-			set_property(TARGET ${_target} PROPERTY COTIRE_${_language}_PRECOMPILED_HEADER "${_pchFile}")
-		endif()
-	endif()
-	set (${_cmdsVar} ${_cmds} PARENT_SCOPE)
+    set (${_cmdsVar} "" PARENT_SCOPE)
+    get_target_property(_targetSourceFiles ${_target} SOURCES)
+    set (_sourceFiles "")
+    set (_excludedSources "")
+    set (_cotiredSources "")
+    cotire_filter_language_source_files(${_language} ${_target} _sourceFiles _excludedSources _cotiredSources ${_targetSourceFiles})
+    if (NOT _sourceFiles AND NOT _cotiredSources)
+        return()
+    endif()
+    set (_cmds "")
+    # check for user provided unity source file list
+    get_property(_unitySourceFiles TARGET ${_target} PROPERTY COTIRE_${_language}_UNITY_SOURCE_INIT)
+    if (NOT _unitySourceFiles)
+        set (_unitySourceFiles ${_sourceFiles} ${_cotiredSources})
+    endif()
+    cotire_generate_target_script(
+        ${_language} "${_configurations}" ${_target} _targetScript _targetConfigScript ${_unitySourceFiles})
+    # set up unity files for parallel compilation
+    cotire_compute_unity_max_number_of_includes(${_target} _maxIncludes ${_unitySourceFiles})
+    cotire_make_unity_source_file_paths(${_language} ${_target} ${_maxIncludes} _unityFiles ${_unitySourceFiles})
+    list (LENGTH _unityFiles _numberOfUnityFiles)
+    if (_numberOfUnityFiles EQUAL 0)
+        return()
+    elseif (_numberOfUnityFiles GREATER 1)
+        cotire_setup_unity_generation_commands(
+            ${_language} ${_target} "${_targetScript}" "${_targetConfigScript}" "${_unityFiles}" _cmds ${_unitySourceFiles})
+    endif()
+    # set up single unity file for prefix header generation
+    cotire_make_single_unity_source_file_path(${_language} ${_target} _unityFile)
+    cotire_setup_unity_generation_commands(
+        ${_language} ${_target} "${_targetScript}" "${_targetConfigScript}" "${_unityFile}" _cmds ${_unitySourceFiles})
+    cotire_make_prefix_file_path(${_language} ${_target} _prefixFile)
+    # set up prefix header
+    if (_prefixFile)
+        # check for user provided prefix header files
+        get_property(_prefixHeaderFiles TARGET ${_target} PROPERTY COTIRE_${_language}_PREFIX_HEADER_INIT)
+        if (_prefixHeaderFiles)
+            cotire_setup_prefix_generation_from_provided_command(
+                ${_language} ${_target} "${_targetConfigScript}" "${_prefixFile}" _cmds ${_prefixHeaderFiles})
+        else()
+            cotire_setup_prefix_generation_from_unity_command(
+                ${_language} ${_target} "${_targetConfigScript}" "${_prefixFile}" "${_unityFile}" _cmds ${_unitySourceFiles})
+        endif()
+        # check if selected language has enough sources at all
+        list (LENGTH _sourceFiles _numberOfSources)
+        if (_numberOfSources LESS ${COTIRE_MINIMUM_NUMBER_OF_TARGET_SOURCES})
+            set (_targetUsePCH FALSE)
+        else()
+            get_target_property(_targetUsePCH ${_target} COTIRE_ENABLE_PRECOMPILED_HEADER)
+        endif()
+        if (_targetUsePCH)
+            cotire_make_pch_file_path(${_language} ${_target} _pchFile)
+            if (_pchFile)
+                # first file in _sourceFiles is passed as the host file
+                cotire_setup_pch_file_compilation(
+                    ${_language} ${_target} "${_targetConfigScript}" "${_prefixFile}" "${_pchFile}" ${_sourceFiles})
+                cotire_setup_pch_file_inclusion(
+                    ${_language} ${_target} ${_wholeTarget} "${_prefixFile}" "${_pchFile}" ${_sourceFiles})
+            endif()
+        elseif (_prefixHeaderFiles)
+            # user provided prefix header must be included unconditionally
+            cotire_setup_prefix_file_inclusion(${_language} ${_target} "${_prefixFile}" ${_sourceFiles})
+        endif()
+    endif()
+    # mark target as cotired for language
+    set_property(TARGET ${_target} PROPERTY COTIRE_${_language}_UNITY_SOURCE "${_unityFiles}")
+    if (_prefixFile)
+        set_property(TARGET ${_target} PROPERTY COTIRE_${_language}_PREFIX_HEADER "${_prefixFile}")
+        if (_targetUsePCH AND _pchFile)
+            set_property(TARGET ${_target} PROPERTY COTIRE_${_language}_PRECOMPILED_HEADER "${_pchFile}")
+        endif()
+    endif()
+    set (${_cmdsVar} ${_cmds} PARENT_SCOPE)
 endfunction()

 function (cotire_setup_clean_target _target)
-	set (_cleanTargetName "${_target}${COTIRE_CLEAN_TARGET_SUFFIX}")
-	if (NOT TARGET "${_cleanTargetName}")
-		cotire_set_cmd_to_prologue(_cmds)
-		get_filename_component(_outputDir "${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}" ABSOLUTE)
-		list (APPEND _cmds -P "${COTIRE_CMAKE_MODULE_FILE}" "cleanup" "${_outputDir}" "${COTIRE_INTDIR}" "${_target}")
-		add_custom_target(${_cleanTargetName}
-			COMMAND ${_cmds}
-			WORKING_DIRECTORY "${CMAKE_BINARY_DIR}"
-			COMMENT "Cleaning up target ${_target} cotire generated files"
-			VERBATIM)
-		cotire_init_target("${_cleanTargetName}")
-	endif()
+    set (_cleanTargetName "${_target}${COTIRE_CLEAN_TARGET_SUFFIX}")
+    if (NOT TARGET "${_cleanTargetName}")
+        cotire_set_cmd_to_prologue(_cmds)
+        get_filename_component(_outputDir "${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}" ABSOLUTE)
+        list (APPEND _cmds -P "${COTIRE_CMAKE_MODULE_FILE}" "cleanup" "${_outputDir}" "${COTIRE_INTDIR}" "${_target}")
+        add_custom_target(${_cleanTargetName}
+            COMMAND ${_cmds}
+            WORKING_DIRECTORY "${CMAKE_BINARY_DIR}"
+            COMMENT "Cleaning up target ${_target} cotire generated files"
+            VERBATIM)
+        cotire_init_target("${_cleanTargetName}")
+    endif()
 endfunction()

 function (cotire_setup_pch_target _languages _configurations _target)
-	if ("${CMAKE_GENERATOR}" MATCHES "Make|Ninja")
-		# for makefile based generators, we add a custom target to trigger the generation of the cotire related files
-		set (_dependsFiles "")
-		foreach (_language ${_languages})
-			set (_props COTIRE_${_language}_PREFIX_HEADER COTIRE_${_language}_UNITY_SOURCE)
-			if (NOT CMAKE_${_language}_COMPILER_ID MATCHES "MSVC|Intel")
-				# Visual Studio and Intel only create precompiled header as a side effect
-				list (INSERT _props 0 COTIRE_${_language}_PRECOMPILED_HEADER)
-			endif()
-			cotire_get_first_set_property_value(_dependsFile TARGET ${_target} ${_props})
-			if (_dependsFile)
-				list (APPEND _dependsFiles "${_dependsFile}")
-			endif()
-		endforeach()
-		if (_dependsFiles)
-			set (_pchTargetName "${_target}${COTIRE_PCH_TARGET_SUFFIX}")
-			add_custom_target("${_pchTargetName}" DEPENDS ${_dependsFiles})
-			cotire_init_target("${_pchTargetName}")
-			cotire_add_to_pch_all_target(${_pchTargetName})
-		endif()
-	else()
-		# for other generators, we add the "clean all" target to clean up the precompiled header
-		cotire_setup_clean_all_target()
-	endif()
+    if ("${CMAKE_GENERATOR}" MATCHES "Make|Ninja")
+        # for makefile based generators, we add a custom target to trigger the generation of the cotire related files
+        set (_dependsFiles "")
+        foreach (_language ${_languages})
+            set (_props COTIRE_${_language}_PREFIX_HEADER COTIRE_${_language}_UNITY_SOURCE)
+            if (NOT CMAKE_${_language}_COMPILER_ID MATCHES "MSVC|Intel")
+                # Visual Studio and Intel only create precompiled header as a side effect
+                list (INSERT _props 0 COTIRE_${_language}_PRECOMPILED_HEADER)
+            endif()
+            cotire_get_first_set_property_value(_dependsFile TARGET ${_target} ${_props})
+            if (_dependsFile)
+                list (APPEND _dependsFiles "${_dependsFile}")
+            endif()
+        endforeach()
+        if (_dependsFiles)
+            set (_pchTargetName "${_target}${COTIRE_PCH_TARGET_SUFFIX}")
+            add_custom_target("${_pchTargetName}" DEPENDS ${_dependsFiles})
+            cotire_init_target("${_pchTargetName}")
+            cotire_add_to_pch_all_target(${_pchTargetName})
+        endif()
+    else()
+        # for other generators, we add the "clean all" target to clean up the precompiled header
+        cotire_setup_clean_all_target()
+    endif()
 endfunction()

 function (cotire_collect_unity_target_sources _target _languages _unityTargetSourcesVar)
-	get_target_property(_targetSourceFiles ${_target} SOURCES)
-	set (_unityTargetSources ${_targetSourceFiles})
-	foreach (_language ${_languages})
-		get_property(_unityFiles TARGET ${_target} PROPERTY COTIRE_${_language}_UNITY_SOURCE)
-		if (_unityFiles)
-			# remove source files that are included in the unity source
-			set (_sourceFiles "")
-			set (_excludedSources "")
-			set (_cotiredSources "")
-			cotire_filter_language_source_files(${_language} ${_target} _sourceFiles _excludedSources _cotiredSources ${_targetSourceFiles})
-			if (_sourceFiles OR _cotiredSources)
-				list (REMOVE_ITEM _unityTargetSources ${_sourceFiles} ${_cotiredSources})
-			endif()
-			# add unity source files instead
-			list (APPEND _unityTargetSources ${_unityFiles})
-		endif()
-	endforeach()
-	set (${_unityTargetSourcesVar} ${_unityTargetSources} PARENT_SCOPE)
+    get_target_property(_targetSourceFiles ${_target} SOURCES)
+    set (_unityTargetSources ${_targetSourceFiles})
+    foreach (_language ${_languages})
+        get_property(_unityFiles TARGET ${_target} PROPERTY COTIRE_${_language}_UNITY_SOURCE)
+        if (_unityFiles)
+            # remove source files that are included in the unity source
+            set (_sourceFiles "")
+            set (_excludedSources "")
+            set (_cotiredSources "")
+            cotire_filter_language_source_files(${_language} ${_target} _sourceFiles _excludedSources _cotiredSources ${_targetSourceFiles})
+            if (_sourceFiles OR _cotiredSources)
+                list (REMOVE_ITEM _unityTargetSources ${_sourceFiles} ${_cotiredSources})
+            endif()
+            # add unity source files instead
+            list (APPEND _unityTargetSources ${_unityFiles})
+        endif()
+    endforeach()
+    set (${_unityTargetSourcesVar} ${_unityTargetSources} PARENT_SCOPE)
 endfunction()

 function (cotire_setup_unity_target_pch_usage _languages _target)
-	foreach (_language ${_languages})
-		get_property(_unityFiles TARGET ${_target} PROPERTY COTIRE_${_language}_UNITY_SOURCE)
-		if (_unityFiles)
-			get_property(_userPrefixFile TARGET ${_target} PROPERTY COTIRE_${_language}_PREFIX_HEADER_INIT)
-			get_property(_prefixFile TARGET ${_target} PROPERTY COTIRE_${_language}_PREFIX_HEADER)
-			if (_userPrefixFile AND _prefixFile)
-				# user provided prefix header must be included unconditionally by unity sources
-				cotire_setup_prefix_file_inclusion(${_language} ${_target} "${_prefixFile}" ${_unityFiles})
-			endif()
-		endif()
-	endforeach()
+    foreach (_language ${_languages})
+        get_property(_unityFiles TARGET ${_target} PROPERTY COTIRE_${_language}_UNITY_SOURCE)
+        if (_unityFiles)
+            get_property(_userPrefixFile TARGET ${_target} PROPERTY COTIRE_${_language}_PREFIX_HEADER_INIT)
+            get_property(_prefixFile TARGET ${_target} PROPERTY COTIRE_${_language}_PREFIX_HEADER)
+            if (_userPrefixFile AND _prefixFile)
+                # user provided prefix header must be included unconditionally by unity sources
+                cotire_setup_prefix_file_inclusion(${_language} ${_target} "${_prefixFile}" ${_unityFiles})
+            endif()
+        endif()
+    endforeach()
 endfunction()

 function (cotire_setup_unity_build_target _languages _configurations _target)
-	get_target_property(_unityTargetName ${_target} COTIRE_UNITY_TARGET_NAME)
-	if (NOT _unityTargetName)
-		set (_unityTargetName "${_target}${COTIRE_UNITY_BUILD_TARGET_SUFFIX}")
-	endif()
-	# determine unity target sub type
-	get_target_property(_targetType ${_target} TYPE)
-	if ("${_targetType}" STREQUAL "EXECUTABLE")
-		set (_unityTargetSubType "")
-	elseif (_targetType MATCHES "(STATIC|SHARED|MODULE|OBJECT)_LIBRARY")
-		set (_unityTargetSubType "${CMAKE_MATCH_1}")
-	else()
-		message (WARNING "cotire: target ${_target} has unknown target type ${_targetType}.")
-		return()
-	endif()
-	# determine unity target sources
-	set (_unityTargetSources "")
-	cotire_collect_unity_target_sources(${_target} "${_languages}" _unityTargetSources)
-	# handle automatic Qt processing
-	get_target_property(_targetAutoMoc ${_target} AUTOMOC)
-	get_target_property(_targetAutoUic ${_target} AUTOUIC)
-	get_target_property(_targetAutoRcc ${_target} AUTORCC)
-	if (_targetAutoMoc OR _targetAutoUic OR _targetAutoRcc)
-		# if the original target sources are subject to CMake's automatic Qt processing,
-		# also include implicitly generated <targetname>_automoc.cpp file
-		list (APPEND _unityTargetSources "${_target}_automoc.cpp")
-		set_property (SOURCE "${_target}_automoc.cpp" PROPERTY GENERATED TRUE)
-	endif()
-	# prevent AUTOMOC, AUTOUIC and AUTORCC properties from being set when the unity target is created
-	set (CMAKE_AUTOMOC OFF)
-	set (CMAKE_AUTOUIC OFF)
-	set (CMAKE_AUTORCC OFF)
-	if (COTIRE_DEBUG)
-		message (STATUS "add target ${_targetType} ${_unityTargetName} ${_unityTargetSubType} EXCLUDE_FROM_ALL ${_unityTargetSources}")
-	endif()
-	# generate unity target
-	if ("${_targetType}" STREQUAL "EXECUTABLE")
-		add_executable(${_unityTargetName} ${_unityTargetSubType} EXCLUDE_FROM_ALL ${_unityTargetSources})
-	else()
-		add_library(${_unityTargetName} ${_unityTargetSubType} EXCLUDE_FROM_ALL ${_unityTargetSources})
-	endif()
-	if (_targetAutoMoc OR _targetAutoUic OR _targetAutoRcc)
-		# depend on the original target's implicity generated <targetname>_automoc target
-		add_dependencies(${_unityTargetName} ${_target}_automoc)
-	endif()
-	# copy output location properties
-	set (_outputDirProperties
-		ARCHIVE_OUTPUT_DIRECTORY ARCHIVE_OUTPUT_DIRECTORY_<CONFIG>
-		LIBRARY_OUTPUT_DIRECTORY LIBRARY_OUTPUT_DIRECTORY_<CONFIG>
-		RUNTIME_OUTPUT_DIRECTORY RUNTIME_OUTPUT_DIRECTORY_<CONFIG>)
-	if (COTIRE_UNITY_OUTPUT_DIRECTORY)
-		set (_setDefaultOutputDir TRUE)
-		if (IS_ABSOLUTE "${COTIRE_UNITY_OUTPUT_DIRECTORY}")
-			set (_outputDir "${COTIRE_UNITY_OUTPUT_DIRECTORY}")
-		else()
-			# append relative COTIRE_UNITY_OUTPUT_DIRECTORY to target's actual output directory
-			cotire_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName} ${_outputDirProperties})
-			cotire_resolve_config_properites("${_configurations}" _properties ${_outputDirProperties})
-			foreach (_property ${_properties})
-				get_property(_outputDir TARGET ${_target} PROPERTY ${_property})
-				if (_outputDir)
-					get_filename_component(_outputDir "${_outputDir}/${COTIRE_UNITY_OUTPUT_DIRECTORY}" ABSOLUTE)
-					set_property(TARGET ${_unityTargetName} PROPERTY ${_property} "${_outputDir}")
-					set (_setDefaultOutputDir FALSE)
-				endif()
-			endforeach()
-			if (_setDefaultOutputDir)
-				get_filename_component(_outputDir "${CMAKE_CURRENT_BINARY_DIR}/${COTIRE_UNITY_OUTPUT_DIRECTORY}" ABSOLUTE)
-			endif()
-		endif()
-		if (_setDefaultOutputDir)
-			set_target_properties(${_unityTargetName} PROPERTIES
-				ARCHIVE_OUTPUT_DIRECTORY "${_outputDir}"
-				LIBRARY_OUTPUT_DIRECTORY "${_outputDir}"
-				RUNTIME_OUTPUT_DIRECTORY "${_outputDir}")
-		endif()
-	else()
-		cotire_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName}
-			${_outputDirProperties})
-	endif()
-	# copy output name
-	cotire_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName}
-		ARCHIVE_OUTPUT_NAME ARCHIVE_OUTPUT_NAME_<CONFIG>
-		LIBRARY_OUTPUT_NAME LIBRARY_OUTPUT_NAME_<CONFIG>
-		OUTPUT_NAME OUTPUT_NAME_<CONFIG>
-		RUNTIME_OUTPUT_NAME RUNTIME_OUTPUT_NAME_<CONFIG>
-		PREFIX <CONFIG>_POSTFIX SUFFIX
-		IMPORT_PREFIX IMPORT_SUFFIX)
-	# copy compile stuff
-	cotire_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName}
-		COMPILE_DEFINITIONS COMPILE_DEFINITIONS_<CONFIG>
-		COMPILE_FLAGS COMPILE_OPTIONS
-		Fortran_FORMAT Fortran_MODULE_DIRECTORY
-		INCLUDE_DIRECTORIES
-		INTERPROCEDURAL_OPTIMIZATION INTERPROCEDURAL_OPTIMIZATION_<CONFIG>
-		POSITION_INDEPENDENT_CODE
-		C_VISIBILITY_PRESET CXX_VISIBILITY_PRESET VISIBILITY_INLINES_HIDDEN)
-	# copy compile features
-	cotire_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName}
-		C_EXTENSIONS C_STANDARD C_STANDARD_REQUIRED
-		CXX_EXTENSIONS CXX_STANDARD CXX_STANDARD_REQUIRED
-		COMPILE_FEATURES)
-	# copy interface stuff
-	cotire_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName}
-		COMPATIBLE_INTERFACE_BOOL COMPATIBLE_INTERFACE_NUMBER_MAX COMPATIBLE_INTERFACE_NUMBER_MIN
-		COMPATIBLE_INTERFACE_STRING
-		INTERFACE_COMPILE_DEFINITIONS INTERFACE_COMPILE_FEATURES INTERFACE_COMPILE_OPTIONS
-		INTERFACE_INCLUDE_DIRECTORIES INTERFACE_SOURCES
-		INTERFACE_POSITION_INDEPENDENT_CODE INTERFACE_SYSTEM_INCLUDE_DIRECTORIES
-		INTERFACE_AUTOUIC_OPTIONS NO_SYSTEM_FROM_IMPORTED)
-	# copy link stuff
-	cotire_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName}
-		BUILD_WITH_INSTALL_RPATH INSTALL_RPATH INSTALL_RPATH_USE_LINK_PATH SKIP_BUILD_RPATH
-		LINKER_LANGUAGE LINK_DEPENDS LINK_DEPENDS_NO_SHARED
-		LINK_FLAGS LINK_FLAGS_<CONFIG>
-		LINK_INTERFACE_LIBRARIES LINK_INTERFACE_LIBRARIES_<CONFIG>
-		LINK_INTERFACE_MULTIPLICITY LINK_INTERFACE_MULTIPLICITY_<CONFIG>
-		LINK_SEARCH_START_STATIC LINK_SEARCH_END_STATIC
-		STATIC_LIBRARY_FLAGS STATIC_LIBRARY_FLAGS_<CONFIG>
-		NO_SONAME SOVERSION VERSION)
-	# copy cmake stuff
-	cotire_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName}
-		IMPLICIT_DEPENDS_INCLUDE_TRANSFORM RULE_LAUNCH_COMPILE RULE_LAUNCH_CUSTOM RULE_LAUNCH_LINK)
-	# copy Apple platform specific stuff
-	cotire_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName}
-		BUNDLE BUNDLE_EXTENSION FRAMEWORK INSTALL_NAME_DIR MACOSX_BUNDLE MACOSX_BUNDLE_INFO_PLIST
-		MACOSX_FRAMEWORK_INFO_PLIST MACOSX_RPATH OSX_ARCHITECTURES
-		OSX_ARCHITECTURES_<CONFIG> PRIVATE_HEADER PUBLIC_HEADER RESOURCE)
-	# copy Windows platform specific stuff
-	cotire_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName}
-		GNUtoMS
-		COMPILE_PDB_NAME COMPILE_PDB_NAME_<CONFIG>
-		COMPILE_PDB_OUTPUT_DIRECTORY COMPILE_PDB_OUTPUT_DIRECTORY_<CONFIG>
-		PDB_NAME PDB_NAME_<CONFIG> PDB_OUTPUT_DIRECTORY PDB_OUTPUT_DIRECTORY_<CONFIG>
-		VS_DOTNET_REFERENCES VS_GLOBAL_KEYWORD VS_GLOBAL_PROJECT_TYPES VS_GLOBAL_ROOTNAMESPACE
-		VS_KEYWORD VS_SCC_AUXPATH VS_SCC_LOCALPATH VS_SCC_PROJECTNAME VS_SCC_PROVIDER
-		VS_WINRT_EXTENSIONS VS_WINRT_REFERENCES VS_WINRT_COMPONENT
-		VS_DOTNET_TARGET_FRAMEWORK_VERSION WIN32_EXECUTABLE)
-	# copy Android platform specific stuff
-	cotire_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName}
-		ANDROID_API ANDROID_API_MIN ANDROID_GUI)
-	# use output name from original target
-	get_target_property(_targetOutputName ${_unityTargetName} OUTPUT_NAME)
-	if (NOT _targetOutputName)
-		set_property(TARGET ${_unityTargetName} PROPERTY OUTPUT_NAME "${_target}")
-	endif()
-	# use export symbol from original target
-	cotire_get_target_export_symbol("${_target}" _defineSymbol)
-	if (_defineSymbol)
-		set_property(TARGET ${_unityTargetName} PROPERTY DEFINE_SYMBOL "${_defineSymbol}")
-		if ("${_targetType}" STREQUAL "EXECUTABLE")
-			set_property(TARGET ${_unityTargetName} PROPERTY ENABLE_EXPORTS TRUE)
-		endif()
-	endif()
-	cotire_init_target(${_unityTargetName})
-	cotire_add_to_unity_all_target(${_unityTargetName})
-	set_property(TARGET ${_target} PROPERTY COTIRE_UNITY_TARGET_NAME "${_unityTargetName}")
+    get_target_property(_unityTargetName ${_target} COTIRE_UNITY_TARGET_NAME)
+    if (NOT _unityTargetName)
+        set (_unityTargetName "${_target}${COTIRE_UNITY_BUILD_TARGET_SUFFIX}")
+    endif()
+    # determine unity target sub type
+    get_target_property(_targetType ${_target} TYPE)
+    if ("${_targetType}" STREQUAL "EXECUTABLE")
+        set (_unityTargetSubType "")
+    elseif (_targetType MATCHES "(STATIC|SHARED|MODULE|OBJECT)_LIBRARY")
+        set (_unityTargetSubType "${CMAKE_MATCH_1}")
+    else()
+        message (WARNING "cotire: target ${_target} has unknown target type ${_targetType}.")
+        return()
+    endif()
+    # determine unity target sources
+    set (_unityTargetSources "")
+    cotire_collect_unity_target_sources(${_target} "${_languages}" _unityTargetSources)
+    # handle automatic Qt processing
+    get_target_property(_targetAutoMoc ${_target} AUTOMOC)
+    get_target_property(_targetAutoUic ${_target} AUTOUIC)
+    get_target_property(_targetAutoRcc ${_target} AUTORCC)
+    if (_targetAutoMoc OR _targetAutoUic OR _targetAutoRcc)
+        # if the original target sources are subject to CMake's automatic Qt processing,
+        # also include implicitly generated <targetname>_automoc.cpp file
+        list (APPEND _unityTargetSources "${_target}_automoc.cpp")
+        set_property (SOURCE "${_target}_automoc.cpp" PROPERTY GENERATED TRUE)
+    endif()
+    # prevent AUTOMOC, AUTOUIC and AUTORCC properties from being set when the unity target is created
+    set (CMAKE_AUTOMOC OFF)
+    set (CMAKE_AUTOUIC OFF)
+    set (CMAKE_AUTORCC OFF)
+    if (COTIRE_DEBUG)
+        message (STATUS "add target ${_targetType} ${_unityTargetName} ${_unityTargetSubType} EXCLUDE_FROM_ALL ${_unityTargetSources}")
+    endif()
+    # generate unity target
+    if ("${_targetType}" STREQUAL "EXECUTABLE")
+        add_executable(${_unityTargetName} ${_unityTargetSubType} EXCLUDE_FROM_ALL ${_unityTargetSources})
+    else()
+        add_library(${_unityTargetName} ${_unityTargetSubType} EXCLUDE_FROM_ALL ${_unityTargetSources})
+    endif()
+    if (_targetAutoMoc OR _targetAutoUic OR _targetAutoRcc)
+        # depend on the original target's implicity generated <targetname>_automoc target
+        add_dependencies(${_unityTargetName} ${_target}_automoc)
+    endif()
+    # copy output location properties
+    set (_outputDirProperties
+        ARCHIVE_OUTPUT_DIRECTORY ARCHIVE_OUTPUT_DIRECTORY_<CONFIG>
+        LIBRARY_OUTPUT_DIRECTORY LIBRARY_OUTPUT_DIRECTORY_<CONFIG>
+        RUNTIME_OUTPUT_DIRECTORY RUNTIME_OUTPUT_DIRECTORY_<CONFIG>)
+    if (COTIRE_UNITY_OUTPUT_DIRECTORY)
+        set (_setDefaultOutputDir TRUE)
+        if (IS_ABSOLUTE "${COTIRE_UNITY_OUTPUT_DIRECTORY}")
+            set (_outputDir "${COTIRE_UNITY_OUTPUT_DIRECTORY}")
+        else()
+            # append relative COTIRE_UNITY_OUTPUT_DIRECTORY to target's actual output directory
+            cotire_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName} ${_outputDirProperties})
+            cotire_resolve_config_properites("${_configurations}" _properties ${_outputDirProperties})
+            foreach (_property ${_properties})
+                get_property(_outputDir TARGET ${_target} PROPERTY ${_property})
+                if (_outputDir)
+                    get_filename_component(_outputDir "${_outputDir}/${COTIRE_UNITY_OUTPUT_DIRECTORY}" ABSOLUTE)
+                    set_property(TARGET ${_unityTargetName} PROPERTY ${_property} "${_outputDir}")
+                    set (_setDefaultOutputDir FALSE)
+                endif()
+            endforeach()
+            if (_setDefaultOutputDir)
+                get_filename_component(_outputDir "${CMAKE_CURRENT_BINARY_DIR}/${COTIRE_UNITY_OUTPUT_DIRECTORY}" ABSOLUTE)
+            endif()
+        endif()
+        if (_setDefaultOutputDir)
+            set_target_properties(${_unityTargetName} PROPERTIES
+                ARCHIVE_OUTPUT_DIRECTORY "${_outputDir}"
+                LIBRARY_OUTPUT_DIRECTORY "${_outputDir}"
+                RUNTIME_OUTPUT_DIRECTORY "${_outputDir}")
+        endif()
+    else()
+        cotire_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName}
+            ${_outputDirProperties})
+    endif()
+    # copy output name
+    cotire_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName}
+        ARCHIVE_OUTPUT_NAME ARCHIVE_OUTPUT_NAME_<CONFIG>
+        LIBRARY_OUTPUT_NAME LIBRARY_OUTPUT_NAME_<CONFIG>
+        OUTPUT_NAME OUTPUT_NAME_<CONFIG>
+        RUNTIME_OUTPUT_NAME RUNTIME_OUTPUT_NAME_<CONFIG>
+        PREFIX <CONFIG>_POSTFIX SUFFIX
+        IMPORT_PREFIX IMPORT_SUFFIX)
+    # copy compile stuff
+    cotire_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName}
+        COMPILE_DEFINITIONS COMPILE_DEFINITIONS_<CONFIG>
+        COMPILE_FLAGS COMPILE_OPTIONS
+        Fortran_FORMAT Fortran_MODULE_DIRECTORY
+        INCLUDE_DIRECTORIES
+        INTERPROCEDURAL_OPTIMIZATION INTERPROCEDURAL_OPTIMIZATION_<CONFIG>
+        POSITION_INDEPENDENT_CODE
+        C_COMPILER_LAUNCHER CXX_COMPILER_LAUNCHER
+        C_INCLUDE_WHAT_YOU_USE CXX_INCLUDE_WHAT_YOU_USE
+        C_VISIBILITY_PRESET CXX_VISIBILITY_PRESET VISIBILITY_INLINES_HIDDEN)
+    # copy compile features
+    cotire_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName}
+        C_EXTENSIONS C_STANDARD C_STANDARD_REQUIRED
+        CXX_EXTENSIONS CXX_STANDARD CXX_STANDARD_REQUIRED
+        COMPILE_FEATURES)
+    # copy interface stuff
+    cotire_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName}
+        COMPATIBLE_INTERFACE_BOOL COMPATIBLE_INTERFACE_NUMBER_MAX COMPATIBLE_INTERFACE_NUMBER_MIN
+        COMPATIBLE_INTERFACE_STRING
+        INTERFACE_COMPILE_DEFINITIONS INTERFACE_COMPILE_FEATURES INTERFACE_COMPILE_OPTIONS
+        INTERFACE_INCLUDE_DIRECTORIES INTERFACE_SOURCES
+        INTERFACE_POSITION_INDEPENDENT_CODE INTERFACE_SYSTEM_INCLUDE_DIRECTORIES
+        INTERFACE_AUTOUIC_OPTIONS NO_SYSTEM_FROM_IMPORTED)
+    # copy link stuff
+    cotire_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName}
+        BUILD_WITH_INSTALL_RPATH INSTALL_RPATH INSTALL_RPATH_USE_LINK_PATH SKIP_BUILD_RPATH
+        LINKER_LANGUAGE LINK_DEPENDS LINK_DEPENDS_NO_SHARED
+        LINK_FLAGS LINK_FLAGS_<CONFIG>
+        LINK_INTERFACE_LIBRARIES LINK_INTERFACE_LIBRARIES_<CONFIG>
+        LINK_INTERFACE_MULTIPLICITY LINK_INTERFACE_MULTIPLICITY_<CONFIG>
+        LINK_SEARCH_START_STATIC LINK_SEARCH_END_STATIC
+        STATIC_LIBRARY_FLAGS STATIC_LIBRARY_FLAGS_<CONFIG>
+        NO_SONAME SOVERSION VERSION)
+    # copy cmake stuff
+    cotire_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName}
+        IMPLICIT_DEPENDS_INCLUDE_TRANSFORM RULE_LAUNCH_COMPILE RULE_LAUNCH_CUSTOM RULE_LAUNCH_LINK)
+    # copy Apple platform specific stuff
+    cotire_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName}
+        BUNDLE BUNDLE_EXTENSION FRAMEWORK FRAMEWORK_VERSION INSTALL_NAME_DIR
+        MACOSX_BUNDLE MACOSX_BUNDLE_INFO_PLIST MACOSX_FRAMEWORK_INFO_PLIST MACOSX_RPATH
+        OSX_ARCHITECTURES OSX_ARCHITECTURES_<CONFIG> PRIVATE_HEADER PUBLIC_HEADER RESOURCE XCTEST)
+    # copy Windows platform specific stuff
+    cotire_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName}
+        GNUtoMS
+        COMPILE_PDB_NAME COMPILE_PDB_NAME_<CONFIG>
+        COMPILE_PDB_OUTPUT_DIRECTORY COMPILE_PDB_OUTPUT_DIRECTORY_<CONFIG>
+        PDB_NAME PDB_NAME_<CONFIG> PDB_OUTPUT_DIRECTORY PDB_OUTPUT_DIRECTORY_<CONFIG>
+        VS_DESKTOP_EXTENSIONS_VERSION VS_DOTNET_REFERENCES VS_DOTNET_TARGET_FRAMEWORK_VERSION
+        VS_GLOBAL_KEYWORD VS_GLOBAL_PROJECT_TYPES VS_GLOBAL_ROOTNAMESPACE
+        VS_IOT_EXTENSIONS_VERSION VS_IOT_STARTUP_TASK
+        VS_KEYWORD VS_MOBILE_EXTENSIONS_VERSION
+        VS_SCC_AUXPATH VS_SCC_LOCALPATH VS_SCC_PROJECTNAME VS_SCC_PROVIDER
+        VS_WINDOWS_TARGET_PLATFORM_MIN_VERSION
+        VS_WINRT_COMPONENT VS_WINRT_EXTENSIONS VS_WINRT_REFERENCES
+        WIN32_EXECUTABLE WINDOWS_EXPORT_ALL_SYMBOLS)
+    # copy Android platform specific stuff
+    cotire_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName}
+        ANDROID_API ANDROID_API_MIN ANDROID_GUI
+        ANDROID_ANT_ADDITIONAL_OPTIONS ANDROID_ARCH ANDROID_ASSETS_DIRECTORIES
+        ANDROID_JAR_DEPENDENCIES ANDROID_JAR_DIRECTORIES ANDROID_JAVA_SOURCE_DIR
+        ANDROID_NATIVE_LIB_DEPENDENCIES ANDROID_NATIVE_LIB_DIRECTORIES
+        ANDROID_PROCESS_MAX ANDROID_PROGUARD ANDROID_PROGUARD_CONFIG_PATH
+        ANDROID_SECURE_PROPS_PATH ANDROID_SKIP_ANT_STEP ANDROID_STL_TYPE)
+    # use output name from original target
+    get_target_property(_targetOutputName ${_unityTargetName} OUTPUT_NAME)
+    if (NOT _targetOutputName)
+        set_property(TARGET ${_unityTargetName} PROPERTY OUTPUT_NAME "${_target}")
+    endif()
+    # use export symbol from original target
+    cotire_get_target_export_symbol("${_target}" _defineSymbol)
+    if (_defineSymbol)
+        set_property(TARGET ${_unityTargetName} PROPERTY DEFINE_SYMBOL "${_defineSymbol}")
+        if ("${_targetType}" STREQUAL "EXECUTABLE")
+            set_property(TARGET ${_unityTargetName} PROPERTY ENABLE_EXPORTS TRUE)
+        endif()
+    endif()
+    cotire_init_target(${_unityTargetName})
+    cotire_add_to_unity_all_target(${_unityTargetName})
+    set_property(TARGET ${_target} PROPERTY COTIRE_UNITY_TARGET_NAME "${_unityTargetName}")
 endfunction(cotire_setup_unity_build_target)

 function (cotire_target _target)
-	set(_options "")
-	set(_oneValueArgs "")
-	set(_multiValueArgs LANGUAGES CONFIGURATIONS)
-	cmake_parse_arguments(_option "${_options}" "${_oneValueArgs}" "${_multiValueArgs}" ${ARGN})
-	if (NOT _option_LANGUAGES)
-		get_property (_option_LANGUAGES GLOBAL PROPERTY ENABLED_LANGUAGES)
-	endif()
-	if (NOT _option_CONFIGURATIONS)
-		cotire_get_configuration_types(_option_CONFIGURATIONS)
-	endif()
-	# trivial checks
-	get_target_property(_imported ${_target} IMPORTED)
-	if (_imported)
-		message (WARNING "cotire: imported target ${_target} cannot be cotired.")
-		return()
-	endif()
-	# resolve alias
-	get_target_property(_aliasName ${_target} ALIASED_TARGET)
-	if (_aliasName)
-		if (COTIRE_DEBUG)
-			message (STATUS "${_target} is an alias. Applying cotire to aliased target ${_aliasName} instead.")
-		endif()
-		set (_target ${_aliasName})
-	endif()
-	# check if target needs to be cotired for build type
-	# when using configuration types, the test is performed at build time
-	cotire_init_cotire_target_properties(${_target})
-	if (NOT CMAKE_CONFIGURATION_TYPES)
-		if (CMAKE_BUILD_TYPE)
-			list (FIND _option_CONFIGURATIONS "${CMAKE_BUILD_TYPE}" _index)
-		else()
-			list (FIND _option_CONFIGURATIONS "None" _index)
-		endif()
-		if (_index EQUAL -1)
-			if (COTIRE_DEBUG)
-				message (STATUS "CMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE} not cotired (${_option_CONFIGURATIONS})")
-			endif()
-			return()
-		endif()
-	endif()
-	# when not using configuration types, immediately create cotire intermediate dir
-	if (NOT CMAKE_CONFIGURATION_TYPES)
-		cotire_get_intermediate_dir(_baseDir)
-		file (MAKE_DIRECTORY "${_baseDir}")
-	endif()
-	# choose languages that apply to the target
-	cotire_choose_target_languages("${_target}" _targetLanguages _wholeTarget ${_option_LANGUAGES})
-	if (NOT _targetLanguages)
-		return()
-	endif()
-	set (_cmds "")
-	foreach (_language ${_targetLanguages})
-		cotire_process_target_language("${_language}" "${_option_CONFIGURATIONS}" ${_target} ${_wholeTarget} _cmd)
-		if (_cmd)
-			list (APPEND _cmds ${_cmd})
-		endif()
-	endforeach()
-	get_target_property(_targetAddSCU ${_target} COTIRE_ADD_UNITY_BUILD)
-	if (_targetAddSCU)
-		cotire_setup_unity_build_target("${_targetLanguages}" "${_option_CONFIGURATIONS}" ${_target})
-	endif()
-	get_target_property(_targetUsePCH ${_target} COTIRE_ENABLE_PRECOMPILED_HEADER)
-	if (_targetUsePCH)
-		cotire_setup_target_pch_usage("${_targetLanguages}" ${_target} ${_wholeTarget} ${_cmds})
-		cotire_setup_pch_target("${_targetLanguages}" "${_option_CONFIGURATIONS}" ${_target})
-		if (_targetAddSCU)
-			cotire_setup_unity_target_pch_usage("${_targetLanguages}" ${_target})
-		endif()
-	endif()
-	get_target_property(_targetAddCleanTarget ${_target} COTIRE_ADD_CLEAN)
-	if (_targetAddCleanTarget)
-		cotire_setup_clean_target(${_target})
-	endif()
+    set(_options "")
+    set(_oneValueArgs "")
+    set(_multiValueArgs LANGUAGES CONFIGURATIONS)
+    cmake_parse_arguments(_option "${_options}" "${_oneValueArgs}" "${_multiValueArgs}" ${ARGN})
+    if (NOT _option_LANGUAGES)
+        get_property (_option_LANGUAGES GLOBAL PROPERTY ENABLED_LANGUAGES)
+    endif()
+    if (NOT _option_CONFIGURATIONS)
+        cotire_get_configuration_types(_option_CONFIGURATIONS)
+    endif()
+    # trivial checks
+    get_target_property(_imported ${_target} IMPORTED)
+    if (_imported)
+        message (WARNING "cotire: imported target ${_target} cannot be cotired.")
+        return()
+    endif()
+    # resolve alias
+    get_target_property(_aliasName ${_target} ALIASED_TARGET)
+    if (_aliasName)
+        if (COTIRE_DEBUG)
+            message (STATUS "${_target} is an alias. Applying cotire to aliased target ${_aliasName} instead.")
+        endif()
+        set (_target ${_aliasName})
+    endif()
+    # check if target needs to be cotired for build type
+    # when using configuration types, the test is performed at build time
+    cotire_init_cotire_target_properties(${_target})
+    if (NOT CMAKE_CONFIGURATION_TYPES)
+        if (CMAKE_BUILD_TYPE)
+            list (FIND _option_CONFIGURATIONS "${CMAKE_BUILD_TYPE}" _index)
+        else()
+            list (FIND _option_CONFIGURATIONS "None" _index)
+        endif()
+        if (_index EQUAL -1)
+            if (COTIRE_DEBUG)
+                message (STATUS "CMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE} not cotired (${_option_CONFIGURATIONS})")
+            endif()
+            return()
+        endif()
+    endif()
+    # when not using configuration types, immediately create cotire intermediate dir
+    if (NOT CMAKE_CONFIGURATION_TYPES)
+        cotire_get_intermediate_dir(_baseDir)
+        file (MAKE_DIRECTORY "${_baseDir}")
+    endif()
+    # choose languages that apply to the target
+    cotire_choose_target_languages("${_target}" _targetLanguages _wholeTarget ${_option_LANGUAGES})
+    if (NOT _targetLanguages)
+        return()
+    endif()
+    set (_cmds "")
+    foreach (_language ${_targetLanguages})
+        cotire_process_target_language("${_language}" "${_option_CONFIGURATIONS}" ${_target} ${_wholeTarget} _cmd)
+        if (_cmd)
+            list (APPEND _cmds ${_cmd})
+        endif()
+    endforeach()
+    get_target_property(_targetAddSCU ${_target} COTIRE_ADD_UNITY_BUILD)
+    if (_targetAddSCU)
+        cotire_setup_unity_build_target("${_targetLanguages}" "${_option_CONFIGURATIONS}" ${_target})
+    endif()
+    get_target_property(_targetUsePCH ${_target} COTIRE_ENABLE_PRECOMPILED_HEADER)
+    if (_targetUsePCH)
+        cotire_setup_target_pch_usage("${_targetLanguages}" ${_target} ${_wholeTarget} ${_cmds})
+        cotire_setup_pch_target("${_targetLanguages}" "${_option_CONFIGURATIONS}" ${_target})
+        if (_targetAddSCU)
+            cotire_setup_unity_target_pch_usage("${_targetLanguages}" ${_target})
+        endif()
+    endif()
+    get_target_property(_targetAddCleanTarget ${_target} COTIRE_ADD_CLEAN)
+    if (_targetAddCleanTarget)
+        cotire_setup_clean_target(${_target})
+    endif()
 endfunction(cotire_target)

 function (cotire_map_libraries _strategy _mappedLibrariesVar)
-	set (_mappedLibraries "")
-	foreach (_library ${ARGN})
-		if (TARGET "${_library}" AND "${_strategy}" MATCHES "COPY_UNITY")
-			# use target's corresponding unity target, if available
-			get_target_property(_libraryUnityTargetName ${_library} COTIRE_UNITY_TARGET_NAME)
-			if (TARGET "${_libraryUnityTargetName}")
-				list (APPEND _mappedLibraries "${_libraryUnityTargetName}")
-			else()
-				list (APPEND _mappedLibraries "${_library}")
-			endif()
-		else()
-			list (APPEND _mappedLibraries "${_library}")
-		endif()
-	endforeach()
-	list (REMOVE_DUPLICATES _mappedLibraries)
-	set (${_mappedLibrariesVar} ${_mappedLibraries} PARENT_SCOPE)
+    set (_mappedLibraries "")
+    foreach (_library ${ARGN})
+        if (TARGET "${_library}" AND "${_strategy}" MATCHES "COPY_UNITY")
+            # use target's corresponding unity target, if available
+            get_target_property(_libraryUnityTargetName ${_library} COTIRE_UNITY_TARGET_NAME)
+            if (TARGET "${_libraryUnityTargetName}")
+                list (APPEND _mappedLibraries "${_libraryUnityTargetName}")
+            else()
+                list (APPEND _mappedLibraries "${_library}")
+            endif()
+        else()
+            list (APPEND _mappedLibraries "${_library}")
+        endif()
+    endforeach()
+    list (REMOVE_DUPLICATES _mappedLibraries)
+    set (${_mappedLibrariesVar} ${_mappedLibraries} PARENT_SCOPE)
 endfunction()

 function (cotire_target_link_libraries _target)
-	get_target_property(_unityTargetName ${_target} COTIRE_UNITY_TARGET_NAME)
-	if (TARGET "${_unityTargetName}")
-		get_target_property(_linkLibrariesStrategy ${_target} COTIRE_UNITY_LINK_LIBRARIES_INIT)
-		if (COTIRE_DEBUG)
-			message (STATUS "unity target ${_unityTargetName} link strategy: ${_linkLibrariesStrategy}")
-		endif()
-		if ("${_linkLibrariesStrategy}" MATCHES "^(COPY|COPY_UNITY)$")
-			set (_unityLinkLibraries "")
-			get_target_property(_linkLibraries ${_target} LINK_LIBRARIES)
-			if (_linkLibraries)
-				list (APPEND _unityLinkLibraries ${_linkLibraries})
-			endif()
-			get_target_property(_interfaceLinkLibraries ${_target} INTERFACE_LINK_LIBRARIES)
-			if (_interfaceLinkLibraries)
-				list (APPEND _unityLinkLibraries ${_interfaceLinkLibraries})
-			endif()
-			cotire_map_libraries("${_linkLibrariesStrategy}" _unityLinkLibraries ${_unityLinkLibraries})
-			if (COTIRE_DEBUG)
-				message (STATUS "unity target ${_unityTargetName} libraries: ${_unityLinkLibraries}")
-			endif()
-			if (_unityLinkLibraries)
-				target_link_libraries(${_unityTargetName} ${_unityLinkLibraries})
-			endif()
-		endif()
-	endif()
+    get_target_property(_unityTargetName ${_target} COTIRE_UNITY_TARGET_NAME)
+    if (TARGET "${_unityTargetName}")
+        get_target_property(_linkLibrariesStrategy ${_target} COTIRE_UNITY_LINK_LIBRARIES_INIT)
+        if (COTIRE_DEBUG)
+            message (STATUS "unity target ${_unityTargetName} link strategy: ${_linkLibrariesStrategy}")
+        endif()
+        if ("${_linkLibrariesStrategy}" MATCHES "^(COPY|COPY_UNITY)$")
+            set (_unityLinkLibraries "")
+            get_target_property(_linkLibraries ${_target} LINK_LIBRARIES)
+            if (_linkLibraries)
+                list (APPEND _unityLinkLibraries ${_linkLibraries})
+            endif()
+            get_target_property(_interfaceLinkLibraries ${_target} INTERFACE_LINK_LIBRARIES)
+            if (_interfaceLinkLibraries)
+                list (APPEND _unityLinkLibraries ${_interfaceLinkLibraries})
+            endif()
+            cotire_map_libraries("${_linkLibrariesStrategy}" _unityLinkLibraries ${_unityLinkLibraries})
+            if (COTIRE_DEBUG)
+                message (STATUS "unity target ${_unityTargetName} libraries: ${_unityLinkLibraries}")
+            endif()
+            if (_unityLinkLibraries)
+                target_link_libraries(${_unityTargetName} ${_unityLinkLibraries})
+            endif()
+        endif()
+    endif()
 endfunction(cotire_target_link_libraries)

 function (cotire_cleanup _binaryDir _cotireIntermediateDirName _targetName)
-	if (_targetName)
-		file (GLOB_RECURSE _cotireFiles "${_binaryDir}/${_targetName}*.*")
-	else()
-		file (GLOB_RECURSE _cotireFiles "${_binaryDir}/*.*")
-	endif()
-	# filter files in intermediate directory
-	set (_filesToRemove "")
-	foreach (_file ${_cotireFiles})
-		get_filename_component(_dir "${_file}" PATH)
-		get_filename_component(_dirName "${_dir}" NAME)
-		if ("${_dirName}" STREQUAL "${_cotireIntermediateDirName}")
-			list (APPEND _filesToRemove "${_file}")
-		endif()
-	endforeach()
-	if (_filesToRemove)
-		if (COTIRE_VERBOSE)
-			message (STATUS "cleaning up ${_filesToRemove}")
-		endif()
-		file (REMOVE ${_filesToRemove})
-	endif()
+    if (_targetName)
+        file (GLOB_RECURSE _cotireFiles "${_binaryDir}/${_targetName}*.*")
+    else()
+        file (GLOB_RECURSE _cotireFiles "${_binaryDir}/*.*")
+    endif()
+    # filter files in intermediate directory
+    set (_filesToRemove "")
+    foreach (_file ${_cotireFiles})
+        get_filename_component(_dir "${_file}" DIRECTORY)
+        get_filename_component(_dirName "${_dir}" NAME)
+        if ("${_dirName}" STREQUAL "${_cotireIntermediateDirName}")
+            list (APPEND _filesToRemove "${_file}")
+        endif()
+    endforeach()
+    if (_filesToRemove)
+        if (COTIRE_VERBOSE)
+            message (STATUS "cleaning up ${_filesToRemove}")
+        endif()
+        file (REMOVE ${_filesToRemove})
+    endif()
 endfunction()

 function (cotire_init_target _targetName)
-	if (COTIRE_TARGETS_FOLDER)
-		set_target_properties(${_targetName} PROPERTIES FOLDER "${COTIRE_TARGETS_FOLDER}")
-	endif()
-	set_target_properties(${_targetName} PROPERTIES EXCLUDE_FROM_ALL TRUE)
-	if (MSVC_IDE)
-		set_target_properties(${_targetName} PROPERTIES EXCLUDE_FROM_DEFAULT_BUILD TRUE)
-	endif()
+    if (COTIRE_TARGETS_FOLDER)
+        set_target_properties(${_targetName} PROPERTIES FOLDER "${COTIRE_TARGETS_FOLDER}")
+    endif()
+    set_target_properties(${_targetName} PROPERTIES EXCLUDE_FROM_ALL TRUE)
+    if (MSVC_IDE)
+        set_target_properties(${_targetName} PROPERTIES EXCLUDE_FROM_DEFAULT_BUILD TRUE)
+    endif()
 endfunction()

 function (cotire_add_to_pch_all_target _pchTargetName)
-	set (_targetName "${COTIRE_PCH_ALL_TARGET_NAME}")
-	if (NOT TARGET "${_targetName}")
-		add_custom_target("${_targetName}"
-			WORKING_DIRECTORY "${CMAKE_BINARY_DIR}"
-			VERBATIM)
-		cotire_init_target("${_targetName}")
-	endif()
-	cotire_setup_clean_all_target()
-	add_dependencies(${_targetName} ${_pchTargetName})
+    set (_targetName "${COTIRE_PCH_ALL_TARGET_NAME}")
+    if (NOT TARGET "${_targetName}")
+        add_custom_target("${_targetName}"
+            WORKING_DIRECTORY "${CMAKE_BINARY_DIR}"
+            VERBATIM)
+        cotire_init_target("${_targetName}")
+    endif()
+    cotire_setup_clean_all_target()
+    add_dependencies(${_targetName} ${_pchTargetName})
 endfunction()

 function (cotire_add_to_unity_all_target _unityTargetName)
-	set (_targetName "${COTIRE_UNITY_BUILD_ALL_TARGET_NAME}")
-	if (NOT TARGET "${_targetName}")
-		add_custom_target("${_targetName}"
-			WORKING_DIRECTORY "${CMAKE_BINARY_DIR}"
-			VERBATIM)
-		cotire_init_target("${_targetName}")
-	endif()
-	cotire_setup_clean_all_target()
-	add_dependencies(${_targetName} ${_unityTargetName})
+    set (_targetName "${COTIRE_UNITY_BUILD_ALL_TARGET_NAME}")
+    if (NOT TARGET "${_targetName}")
+        add_custom_target("${_targetName}"
+            WORKING_DIRECTORY "${CMAKE_BINARY_DIR}"
+            VERBATIM)
+        cotire_init_target("${_targetName}")
+    endif()
+    cotire_setup_clean_all_target()
+    add_dependencies(${_targetName} ${_unityTargetName})
 endfunction()

 function (cotire_setup_clean_all_target)
-	set (_targetName "${COTIRE_CLEAN_ALL_TARGET_NAME}")
-	if (NOT TARGET "${_targetName}")
-		cotire_set_cmd_to_prologue(_cmds)
-		list (APPEND _cmds -P "${COTIRE_CMAKE_MODULE_FILE}" "cleanup" "${CMAKE_BINARY_DIR}" "${COTIRE_INTDIR}")
-		add_custom_target(${_targetName}
-			COMMAND ${_cmds}
-			WORKING_DIRECTORY "${CMAKE_BINARY_DIR}"
-			COMMENT "Cleaning up all cotire generated files"
-			VERBATIM)
-		cotire_init_target("${_targetName}")
-	endif()
+    set (_targetName "${COTIRE_CLEAN_ALL_TARGET_NAME}")
+    if (NOT TARGET "${_targetName}")
+        cotire_set_cmd_to_prologue(_cmds)
+        list (APPEND _cmds -P "${COTIRE_CMAKE_MODULE_FILE}" "cleanup" "${CMAKE_BINARY_DIR}" "${COTIRE_INTDIR}")
+        add_custom_target(${_targetName}
+            COMMAND ${_cmds}
+            WORKING_DIRECTORY "${CMAKE_BINARY_DIR}"
+            COMMENT "Cleaning up all cotire generated files"
+            VERBATIM)
+        cotire_init_target("${_targetName}")
+    endif()
 endfunction()

 function (cotire)
-	set(_options "")
-	set(_oneValueArgs "")
-	set(_multiValueArgs LANGUAGES CONFIGURATIONS)
-	cmake_parse_arguments(_option "${_options}" "${_oneValueArgs}" "${_multiValueArgs}" ${ARGN})
-	set (_targets ${_option_UNPARSED_ARGUMENTS})
-	foreach (_target ${_targets})
-		if (TARGET ${_target})
-			cotire_target(${_target} LANGUAGES ${_option_LANGUAGES} CONFIGURATIONS ${_option_CONFIGURATIONS})
-		else()
-			message (WARNING "cotire: ${_target} is not a target.")
-		endif()
-	endforeach()
-	foreach (_target ${_targets})
-		if (TARGET ${_target})
-			cotire_target_link_libraries(${_target})
-		endif()
-	endforeach()
+    set(_options "")
+    set(_oneValueArgs "")
+    set(_multiValueArgs LANGUAGES CONFIGURATIONS)
+    cmake_parse_arguments(_option "${_options}" "${_oneValueArgs}" "${_multiValueArgs}" ${ARGN})
+    set (_targets ${_option_UNPARSED_ARGUMENTS})
+    foreach (_target ${_targets})
+        if (TARGET ${_target})
+            cotire_target(${_target} LANGUAGES ${_option_LANGUAGES} CONFIGURATIONS ${_option_CONFIGURATIONS})
+        else()
+            message (WARNING "cotire: ${_target} is not a target.")
+        endif()
+    endforeach()
+    foreach (_target ${_targets})
+        if (TARGET ${_target})
+            cotire_target_link_libraries(${_target})
+        endif()
+    endforeach()
 endfunction()

 if (CMAKE_SCRIPT_MODE_FILE)

-	# cotire is being run in script mode
-	# locate -P on command args
-	set (COTIRE_ARGC -1)
-	foreach (_index RANGE ${CMAKE_ARGC})
-		if (COTIRE_ARGC GREATER -1)
-			set (COTIRE_ARGV${COTIRE_ARGC} "${CMAKE_ARGV${_index}}")
-			math (EXPR COTIRE_ARGC "${COTIRE_ARGC} + 1")
-		elseif ("${CMAKE_ARGV${_index}}" STREQUAL "-P")
-			set (COTIRE_ARGC 0)
-		endif()
-	endforeach()
-
-	# include target script if available
-	if ("${COTIRE_ARGV2}" MATCHES "\\.cmake$")
-		# the included target scripts sets up additional variables relating to the target (e.g., COTIRE_TARGET_SOURCES)
-		include("${COTIRE_ARGV2}")
-	endif()
-
-	if (COTIRE_DEBUG)
-		message (STATUS "${COTIRE_ARGV0} ${COTIRE_ARGV1} ${COTIRE_ARGV2} ${COTIRE_ARGV3} ${COTIRE_ARGV4} ${COTIRE_ARGV5}")
-	endif()
-
-	if (NOT COTIRE_BUILD_TYPE)
-		set (COTIRE_BUILD_TYPE "None")
-	endif()
-	string (TOUPPER "${COTIRE_BUILD_TYPE}" _upperConfig)
-	set (_includeDirs ${COTIRE_TARGET_INCLUDE_DIRECTORIES_${_upperConfig}})
-	set (_systemIncludeDirs ${COTIRE_TARGET_SYSTEM_INCLUDE_DIRECTORIES_${_upperConfig}})
-	set (_compileDefinitions ${COTIRE_TARGET_COMPILE_DEFINITIONS_${_upperConfig}})
-	set (_compileFlags ${COTIRE_TARGET_COMPILE_FLAGS_${_upperConfig}})
-	# check if target has been cotired for actual build type COTIRE_BUILD_TYPE
-	list (FIND COTIRE_TARGET_CONFIGURATION_TYPES "${COTIRE_BUILD_TYPE}" _index)
-	if (_index GREATER -1)
-		set (_sources ${COTIRE_TARGET_SOURCES})
-		set (_sourcesDefinitions ${COTIRE_TARGET_SOURCES_COMPILE_DEFINITIONS_${_upperConfig}})
-	else()
-		if (COTIRE_DEBUG)
-			message (STATUS "COTIRE_BUILD_TYPE=${COTIRE_BUILD_TYPE} not cotired (${COTIRE_TARGET_CONFIGURATION_TYPES})")
-		endif()
-		set (_sources "")
-		set (_sourceLocations "")
-		set (_sourcesDefinitions "")
-	endif()
-	set (_targetPreUndefs ${COTIRE_TARGET_PRE_UNDEFS})
-	set (_targetPostUndefs ${COTIRE_TARGET_POST_UNDEFS})
-	set (_sourcesPreUndefs ${COTIRE_TARGET_SOURCES_PRE_UNDEFS})
-	set (_sourcesPostUndefs ${COTIRE_TARGET_SOURCES_POST_UNDEFS})
-
-	if ("${COTIRE_ARGV1}" STREQUAL "unity")
-
-		if (XCODE)
-			# executing pre-build action under Xcode, check dependency on target script
-			set (_dependsOption DEPENDS "${COTIRE_ARGV2}")
-		else()
-			# executing custom command, no need to re-check for dependencies
-			set (_dependsOption "")
-		endif()
-
-		cotire_select_unity_source_files("${COTIRE_ARGV3}" _sources ${_sources})
-
-		cotire_generate_unity_source(
-			"${COTIRE_ARGV3}" ${_sources}
-			LANGUAGE "${COTIRE_TARGET_LANGUAGE}"
-			SOURCES_COMPILE_DEFINITIONS ${_sourcesDefinitions}
-			PRE_UNDEFS ${_targetPreUndefs}
-			POST_UNDEFS ${_targetPostUndefs}
-			SOURCES_PRE_UNDEFS ${_sourcesPreUndefs}
-			SOURCES_POST_UNDEFS ${_sourcesPostUndefs}
-			${_dependsOption})
-
-	elseif ("${COTIRE_ARGV1}" STREQUAL "prefix")
-
-		if (XCODE)
-			# executing pre-build action under Xcode, check dependency on unity file and prefix dependencies
-			set (_dependsOption DEPENDS "${COTIRE_ARGV4}" ${COTIRE_TARGET_PREFIX_DEPENDS})
-		else()
-			# executing custom command, no need to re-check for dependencies
-			set (_dependsOption "")
-		endif()
-
-		set (_files "")
-		foreach (_index RANGE 4 ${COTIRE_ARGC})
-			if (COTIRE_ARGV${_index})
-				list (APPEND _files "${COTIRE_ARGV${_index}}")
-			endif()
-		endforeach()
-
-		cotire_generate_prefix_header(
-			"${COTIRE_ARGV3}" ${_files}
-			COMPILER_EXECUTABLE "${CMAKE_${COTIRE_TARGET_LANGUAGE}_COMPILER}"
-			COMPILER_ARG1 ${CMAKE_${COTIRE_TARGET_LANGUAGE}_COMPILER_ARG1}
-			COMPILER_ID "${CMAKE_${COTIRE_TARGET_LANGUAGE}_COMPILER_ID}"
-			COMPILER_VERSION "${CMAKE_${COTIRE_TARGET_LANGUAGE}_COMPILER_VERSION}"
-			LANGUAGE "${COTIRE_TARGET_LANGUAGE}"
-			IGNORE_PATH "${COTIRE_TARGET_IGNORE_PATH};${COTIRE_ADDITIONAL_PREFIX_HEADER_IGNORE_PATH}"
-			INCLUDE_PATH ${COTIRE_TARGET_INCLUDE_PATH}
-			IGNORE_EXTENSIONS "${CMAKE_${COTIRE_TARGET_LANGUAGE}_SOURCE_FILE_EXTENSIONS};${COTIRE_ADDITIONAL_PREFIX_HEADER_IGNORE_EXTENSIONS}"
-			INCLUDE_PRIORITY_PATH ${COTIRE_TARGET_INCLUDE_PRIORITY_PATH}
-			INCLUDE_SYSTEM_FLAG "${COTIRE_INCLUDE_SYSTEM_FLAG}"
-			INCLUDE_DIRECTORIES ${_includeDirs}
-			SYSTEM_INCLUDE_DIRECTORIES ${_systemIncludeDirs}
-			COMPILE_DEFINITIONS ${_compileDefinitions}
-			COMPILE_FLAGS ${_compileFlags}
-			${_dependsOption})
-
-	elseif ("${COTIRE_ARGV1}" STREQUAL "precompile")
-
-		set (_files "")
-		foreach (_index RANGE 5 ${COTIRE_ARGC})
-			if (COTIRE_ARGV${_index})
-				list (APPEND _files "${COTIRE_ARGV${_index}}")
-			endif()
-		endforeach()
-
-		cotire_precompile_prefix_header(
-			"${COTIRE_ARGV3}" "${COTIRE_ARGV4}" "${COTIRE_ARGV5}"
-			COMPILER_EXECUTABLE "${CMAKE_${COTIRE_TARGET_LANGUAGE}_COMPILER}"
-			COMPILER_ARG1 ${CMAKE_${COTIRE_TARGET_LANGUAGE}_COMPILER_ARG1}
-			COMPILER_ID "${CMAKE_${COTIRE_TARGET_LANGUAGE}_COMPILER_ID}"
-			COMPILER_VERSION "${CMAKE_${COTIRE_TARGET_LANGUAGE}_COMPILER_VERSION}"
-			LANGUAGE "${COTIRE_TARGET_LANGUAGE}"
-			INCLUDE_SYSTEM_FLAG "${COTIRE_INCLUDE_SYSTEM_FLAG}"
-			INCLUDE_DIRECTORIES ${_includeDirs}
-			SYSTEM_INCLUDE_DIRECTORIES ${_systemIncludeDirs}
-			COMPILE_DEFINITIONS ${_compileDefinitions}
-			COMPILE_FLAGS ${_compileFlags})
-
-	elseif ("${COTIRE_ARGV1}" STREQUAL "combine")
-
-		if (COTIRE_TARGET_LANGUAGE)
-			set (_combinedFile "${COTIRE_ARGV3}")
-			set (_startIndex 4)
-		else()
-			set (_combinedFile "${COTIRE_ARGV2}")
-			set (_startIndex 3)
-		endif()
-		set (_files "")
-		foreach (_index RANGE ${_startIndex} ${COTIRE_ARGC})
-			if (COTIRE_ARGV${_index})
-				list (APPEND _files "${COTIRE_ARGV${_index}}")
-			endif()
-		endforeach()
-
-		if (XCODE)
-			# executing pre-build action under Xcode, check dependency on files to be combined
-			set (_dependsOption DEPENDS ${_files})
-		else()
-			# executing custom command, no need to re-check for dependencies
-			set (_dependsOption "")
-		endif()
-
-		if (COTIRE_TARGET_LANGUAGE)
-			cotire_generate_unity_source(
-				"${_combinedFile}" ${_files}
-				LANGUAGE "${COTIRE_TARGET_LANGUAGE}"
-				${_dependsOption})
-		else()
-			cotire_generate_unity_source("${_combinedFile}" ${_files} ${_dependsOption})
-		endif()
-
-	elseif ("${COTIRE_ARGV1}" STREQUAL "cleanup")
-
-		cotire_cleanup("${COTIRE_ARGV2}" "${COTIRE_ARGV3}" "${COTIRE_ARGV4}")
-
-	else()
-		message (FATAL_ERROR "cotire: unknown command \"${COTIRE_ARGV1}\".")
-	endif()
+    # cotire is being run in script mode
+    # locate -P on command args
+    set (COTIRE_ARGC -1)
+    foreach (_index RANGE ${CMAKE_ARGC})
+        if (COTIRE_ARGC GREATER -1)
+            set (COTIRE_ARGV${COTIRE_ARGC} "${CMAKE_ARGV${_index}}")
+            math (EXPR COTIRE_ARGC "${COTIRE_ARGC} + 1")
+        elseif ("${CMAKE_ARGV${_index}}" STREQUAL "-P")
+            set (COTIRE_ARGC 0)
+        endif()
+    endforeach()
+
+    # include target script if available
+    if ("${COTIRE_ARGV2}" MATCHES "\\.cmake$")
+        # the included target scripts sets up additional variables relating to the target (e.g., COTIRE_TARGET_SOURCES)
+        include("${COTIRE_ARGV2}")
+    endif()
+
+    if (COTIRE_DEBUG)
+        message (STATUS "${COTIRE_ARGV0} ${COTIRE_ARGV1} ${COTIRE_ARGV2} ${COTIRE_ARGV3} ${COTIRE_ARGV4} ${COTIRE_ARGV5}")
+    endif()
+
+    if (NOT COTIRE_BUILD_TYPE)
+        set (COTIRE_BUILD_TYPE "None")
+    endif()
+    string (TOUPPER "${COTIRE_BUILD_TYPE}" _upperConfig)
+    set (_includeDirs ${COTIRE_TARGET_INCLUDE_DIRECTORIES_${_upperConfig}})
+    set (_systemIncludeDirs ${COTIRE_TARGET_SYSTEM_INCLUDE_DIRECTORIES_${_upperConfig}})
+    set (_compileDefinitions ${COTIRE_TARGET_COMPILE_DEFINITIONS_${_upperConfig}})
+    set (_compileFlags ${COTIRE_TARGET_COMPILE_FLAGS_${_upperConfig}})
+    # check if target has been cotired for actual build type COTIRE_BUILD_TYPE
+    list (FIND COTIRE_TARGET_CONFIGURATION_TYPES "${COTIRE_BUILD_TYPE}" _index)
+    if (_index GREATER -1)
+        set (_sources ${COTIRE_TARGET_SOURCES})
+        set (_sourcesDefinitions ${COTIRE_TARGET_SOURCES_COMPILE_DEFINITIONS_${_upperConfig}})
+    else()
+        if (COTIRE_DEBUG)
+            message (STATUS "COTIRE_BUILD_TYPE=${COTIRE_BUILD_TYPE} not cotired (${COTIRE_TARGET_CONFIGURATION_TYPES})")
+        endif()
+        set (_sources "")
+        set (_sourcesDefinitions "")
+    endif()
+    set (_targetPreUndefs ${COTIRE_TARGET_PRE_UNDEFS})
+    set (_targetPostUndefs ${COTIRE_TARGET_POST_UNDEFS})
+    set (_sourcesPreUndefs ${COTIRE_TARGET_SOURCES_PRE_UNDEFS})
+    set (_sourcesPostUndefs ${COTIRE_TARGET_SOURCES_POST_UNDEFS})
+
+    if ("${COTIRE_ARGV1}" STREQUAL "unity")
+
+        if (XCODE)
+            # executing pre-build action under Xcode, check dependency on target script
+            set (_dependsOption DEPENDS "${COTIRE_ARGV2}")
+        else()
+            # executing custom command, no need to re-check for dependencies
+            set (_dependsOption "")
+        endif()
+
+        cotire_select_unity_source_files("${COTIRE_ARGV3}" _sources ${_sources})
+
+        cotire_generate_unity_source(
+            "${COTIRE_ARGV3}" ${_sources}
+            LANGUAGE "${COTIRE_TARGET_LANGUAGE}"
+            SOURCES_COMPILE_DEFINITIONS ${_sourcesDefinitions}
+            PRE_UNDEFS ${_targetPreUndefs}
+            POST_UNDEFS ${_targetPostUndefs}
+            SOURCES_PRE_UNDEFS ${_sourcesPreUndefs}
+            SOURCES_POST_UNDEFS ${_sourcesPostUndefs}
+            ${_dependsOption})
+
+    elseif ("${COTIRE_ARGV1}" STREQUAL "prefix")
+
+        if (XCODE)
+            # executing pre-build action under Xcode, check dependency on unity file and prefix dependencies
+            set (_dependsOption DEPENDS "${COTIRE_ARGV4}" ${COTIRE_TARGET_PREFIX_DEPENDS})
+        else()
+            # executing custom command, no need to re-check for dependencies
+            set (_dependsOption "")
+        endif()
+
+        set (_files "")
+        foreach (_index RANGE 4 ${COTIRE_ARGC})
+            if (COTIRE_ARGV${_index})
+                list (APPEND _files "${COTIRE_ARGV${_index}}")
+            endif()
+        endforeach()
+
+        cotire_generate_prefix_header(
+            "${COTIRE_ARGV3}" ${_files}
+            COMPILER_EXECUTABLE "${CMAKE_${COTIRE_TARGET_LANGUAGE}_COMPILER}"
+            COMPILER_ARG1 ${CMAKE_${COTIRE_TARGET_LANGUAGE}_COMPILER_ARG1}
+            COMPILER_ID "${CMAKE_${COTIRE_TARGET_LANGUAGE}_COMPILER_ID}"
+            COMPILER_VERSION "${CMAKE_${COTIRE_TARGET_LANGUAGE}_COMPILER_VERSION}"
+            LANGUAGE "${COTIRE_TARGET_LANGUAGE}"
+            IGNORE_PATH "${COTIRE_TARGET_IGNORE_PATH};${COTIRE_ADDITIONAL_PREFIX_HEADER_IGNORE_PATH}"
+            INCLUDE_PATH ${COTIRE_TARGET_INCLUDE_PATH}
+            IGNORE_EXTENSIONS "${CMAKE_${COTIRE_TARGET_LANGUAGE}_SOURCE_FILE_EXTENSIONS};${COTIRE_ADDITIONAL_PREFIX_HEADER_IGNORE_EXTENSIONS}"
+            INCLUDE_PRIORITY_PATH ${COTIRE_TARGET_INCLUDE_PRIORITY_PATH}
+            INCLUDE_DIRECTORIES ${_includeDirs}
+            SYSTEM_INCLUDE_DIRECTORIES ${_systemIncludeDirs}
+            COMPILE_DEFINITIONS ${_compileDefinitions}
+            COMPILE_FLAGS ${_compileFlags}
+            ${_dependsOption})
+
+    elseif ("${COTIRE_ARGV1}" STREQUAL "precompile")
+
+        set (_files "")
+        foreach (_index RANGE 5 ${COTIRE_ARGC})
+            if (COTIRE_ARGV${_index})
+                list (APPEND _files "${COTIRE_ARGV${_index}}")
+            endif()
+        endforeach()
+
+        cotire_precompile_prefix_header(
+            "${COTIRE_ARGV3}" "${COTIRE_ARGV4}" "${COTIRE_ARGV5}"
+            COMPILER_EXECUTABLE "${CMAKE_${COTIRE_TARGET_LANGUAGE}_COMPILER}"
+            COMPILER_ARG1 ${CMAKE_${COTIRE_TARGET_LANGUAGE}_COMPILER_ARG1}
+            COMPILER_ID "${CMAKE_${COTIRE_TARGET_LANGUAGE}_COMPILER_ID}"
+            COMPILER_VERSION "${CMAKE_${COTIRE_TARGET_LANGUAGE}_COMPILER_VERSION}"
+            LANGUAGE "${COTIRE_TARGET_LANGUAGE}"
+            INCLUDE_DIRECTORIES ${_includeDirs}
+            SYSTEM_INCLUDE_DIRECTORIES ${_systemIncludeDirs}
+            COMPILE_DEFINITIONS ${_compileDefinitions}
+            COMPILE_FLAGS ${_compileFlags})
+
+    elseif ("${COTIRE_ARGV1}" STREQUAL "combine")
+
+        if (COTIRE_TARGET_LANGUAGE)
+            set (_combinedFile "${COTIRE_ARGV3}")
+            set (_startIndex 4)
+        else()
+            set (_combinedFile "${COTIRE_ARGV2}")
+            set (_startIndex 3)
+        endif()
+        set (_files "")
+        foreach (_index RANGE ${_startIndex} ${COTIRE_ARGC})
+            if (COTIRE_ARGV${_index})
+                list (APPEND _files "${COTIRE_ARGV${_index}}")
+            endif()
+        endforeach()
+
+        if (XCODE)
+            # executing pre-build action under Xcode, check dependency on files to be combined
+            set (_dependsOption DEPENDS ${_files})
+        else()
+            # executing custom command, no need to re-check for dependencies
+            set (_dependsOption "")
+        endif()
+
+        if (COTIRE_TARGET_LANGUAGE)
+            cotire_generate_unity_source(
+                "${_combinedFile}" ${_files}
+                LANGUAGE "${COTIRE_TARGET_LANGUAGE}"
+                ${_dependsOption})
+        else()
+            cotire_generate_unity_source("${_combinedFile}" ${_files} ${_dependsOption})
+        endif()
+
+    elseif ("${COTIRE_ARGV1}" STREQUAL "cleanup")
+
+        cotire_cleanup("${COTIRE_ARGV2}" "${COTIRE_ARGV3}" "${COTIRE_ARGV4}")
+
+    else()
+        message (FATAL_ERROR "cotire: unknown command \"${COTIRE_ARGV1}\".")
+    endif()

 else()

-	# cotire is being run in include mode
-	# set up all variable and property definitions
-
-	if (NOT DEFINED COTIRE_DEBUG_INIT)
-		if (DEFINED COTIRE_DEBUG)
-			set (COTIRE_DEBUG_INIT ${COTIRE_DEBUG})
-		else()
-			set (COTIRE_DEBUG_INIT FALSE)
-		endif()
-	endif()
-	option (COTIRE_DEBUG "Enable cotire debugging output?" ${COTIRE_DEBUG_INIT})
-
-	if (NOT DEFINED COTIRE_VERBOSE_INIT)
-		if (DEFINED COTIRE_VERBOSE)
-			set (COTIRE_VERBOSE_INIT ${COTIRE_VERBOSE})
-		else()
-			set (COTIRE_VERBOSE_INIT FALSE)
-		endif()
-	endif()
-	option (COTIRE_VERBOSE "Enable cotire verbose output?" ${COTIRE_VERBOSE_INIT})
-
-	set (COTIRE_ADDITIONAL_PREFIX_HEADER_IGNORE_EXTENSIONS "inc;inl;ipp" CACHE STRING
-		"Ignore headers with the listed file extensions from the generated prefix header.")
-
-	set (COTIRE_ADDITIONAL_PREFIX_HEADER_IGNORE_PATH "" CACHE STRING
-		"Ignore headers from these directories when generating the prefix header.")
-
-	set (COTIRE_UNITY_SOURCE_EXCLUDE_EXTENSIONS "m;mm" CACHE STRING
-		"Ignore sources with the listed file extensions from the generated unity source.")
-
-	set (COTIRE_MINIMUM_NUMBER_OF_TARGET_SOURCES "3" CACHE STRING
-		"Minimum number of sources in target required to enable use of precompiled header.")
-
-	if (NOT DEFINED COTIRE_MAXIMUM_NUMBER_OF_UNITY_INCLUDES_INIT)
-		if (DEFINED COTIRE_MAXIMUM_NUMBER_OF_UNITY_INCLUDES)
-			set (COTIRE_MAXIMUM_NUMBER_OF_UNITY_INCLUDES_INIT ${COTIRE_MAXIMUM_NUMBER_OF_UNITY_INCLUDES})
-		elseif ("${CMAKE_GENERATOR}" MATCHES "JOM|Ninja|Visual Studio")
-			# enable parallelization for generators that run multiple jobs by default
-			set (COTIRE_MAXIMUM_NUMBER_OF_UNITY_INCLUDES_INIT "-j")
-		else()
-			set (COTIRE_MAXIMUM_NUMBER_OF_UNITY_INCLUDES_INIT "0")
-		endif()
-	endif()
-	set (COTIRE_MAXIMUM_NUMBER_OF_UNITY_INCLUDES "${COTIRE_MAXIMUM_NUMBER_OF_UNITY_INCLUDES_INIT}" CACHE STRING
-		"Maximum number of source files to include in a single unity source file.")
-
-	if (NOT COTIRE_PREFIX_HEADER_FILENAME_SUFFIX)
-		set (COTIRE_PREFIX_HEADER_FILENAME_SUFFIX "_prefix")
-	endif()
-	if (NOT COTIRE_UNITY_SOURCE_FILENAME_SUFFIX)
-		set (COTIRE_UNITY_SOURCE_FILENAME_SUFFIX "_unity")
-	endif()
-	if (NOT COTIRE_INTDIR)
-		set (COTIRE_INTDIR "cotire")
-	endif()
-	if (NOT COTIRE_PCH_ALL_TARGET_NAME)
-		set (COTIRE_PCH_ALL_TARGET_NAME "all_pch")
-	endif()
-	if (NOT COTIRE_UNITY_BUILD_ALL_TARGET_NAME)
-		set (COTIRE_UNITY_BUILD_ALL_TARGET_NAME "all_unity")
-	endif()
-	if (NOT COTIRE_CLEAN_ALL_TARGET_NAME)
-		set (COTIRE_CLEAN_ALL_TARGET_NAME "clean_cotire")
-	endif()
-	if (NOT COTIRE_CLEAN_TARGET_SUFFIX)
-		set (COTIRE_CLEAN_TARGET_SUFFIX "_clean_cotire")
-	endif()
-	if (NOT COTIRE_PCH_TARGET_SUFFIX)
-		set (COTIRE_PCH_TARGET_SUFFIX "_pch")
-	endif()
-	if (MSVC)
-		# MSVC default PCH memory scaling factor of 100 percent (75 MB) is too small for template heavy C++ code
-		# use a bigger default factor of 140 percent (105 MB)
-		if (NOT DEFINED COTIRE_PCH_MEMORY_SCALING_FACTOR)
-			set (COTIRE_PCH_MEMORY_SCALING_FACTOR "140")
-		endif()
-	endif()
-	if (NOT COTIRE_UNITY_BUILD_TARGET_SUFFIX)
-		set (COTIRE_UNITY_BUILD_TARGET_SUFFIX "_unity")
-	endif()
-	if (NOT DEFINED COTIRE_TARGETS_FOLDER)
-		set (COTIRE_TARGETS_FOLDER "cotire")
-	endif()
-	if (NOT DEFINED COTIRE_UNITY_OUTPUT_DIRECTORY)
-		if ("${CMAKE_GENERATOR}" MATCHES "Ninja")
-			# generated Ninja build files do not work if the unity target produces the same output file as the cotired target
-			set (COTIRE_UNITY_OUTPUT_DIRECTORY "unity")
-		else()
-			set (COTIRE_UNITY_OUTPUT_DIRECTORY "")
-		endif()
-	endif()
-
-	# define cotire cache variables
-
-	define_property(
-		CACHED_VARIABLE PROPERTY "COTIRE_ADDITIONAL_PREFIX_HEADER_IGNORE_PATH"
-		BRIEF_DOCS "Ignore headers from these directories when generating the prefix header."
-		FULL_DOCS
-			"The variable can be set to a semicolon separated list of include directories."
-			"If a header file is found in one of these directories or sub-directories, it will be excluded from the generated prefix header."
-			"If not defined, defaults to empty list."
-	)
-
-	define_property(
-		CACHED_VARIABLE PROPERTY "COTIRE_ADDITIONAL_PREFIX_HEADER_IGNORE_EXTENSIONS"
-		BRIEF_DOCS "Ignore includes with the listed file extensions from the generated prefix header."
-		FULL_DOCS
-			"The variable can be set to a semicolon separated list of file extensions."
-			"If a header file extension matches one in the list, it will be excluded from the generated prefix header."
-			"Includes with an extension in CMAKE_<LANG>_SOURCE_FILE_EXTENSIONS are always ignored."
-			"If not defined, defaults to inc;inl;ipp."
-	)
-
-	define_property(
-		CACHED_VARIABLE PROPERTY "COTIRE_UNITY_SOURCE_EXCLUDE_EXTENSIONS"
-		BRIEF_DOCS "Exclude sources with the listed file extensions from the generated unity source."
-		FULL_DOCS
-			"The variable can be set to a semicolon separated list of file extensions."
-			"If a source file extension matches one in the list, it will be excluded from the generated unity source file."
-			"Source files with an extension in CMAKE_<LANG>_IGNORE_EXTENSIONS are always excluded."
-			"If not defined, defaults to m;mm."
-	)
-
-	define_property(
-		CACHED_VARIABLE PROPERTY "COTIRE_MINIMUM_NUMBER_OF_TARGET_SOURCES"
-		BRIEF_DOCS "Minimum number of sources in target required to enable use of precompiled header."
-		FULL_DOCS
-			"The variable can be set to an integer > 0."
-			"If a target contains less than that number of source files, cotire will not enable the use of the precompiled header for the target."
-			"If not defined, defaults to 3."
-	)
-
-	define_property(
-		CACHED_VARIABLE PROPERTY "COTIRE_MAXIMUM_NUMBER_OF_UNITY_INCLUDES"
-		BRIEF_DOCS "Maximum number of source files to include in a single unity source file."
-		FULL_DOCS
-			"This may be set to an integer >= 0."
-			"If 0, cotire will only create a single unity source file."
-			"If a target contains more than that number of source files, cotire will create multiple unity source files for it."
-			"Can be set to \"-j\" to optimize the count of unity source files for the number of available processor cores."
-			"Can be set to \"-j jobs\" to optimize the number of unity source files for the given number of simultaneous jobs."
-			"Is used to initialize the target property COTIRE_UNITY_SOURCE_MAXIMUM_NUMBER_OF_INCLUDES."
-			"Defaults to \"-j\" for the generators Visual Studio, JOM or Ninja. Defaults to 0 otherwise."
-	)
-
-	# define cotire directory properties
-
-	define_property(
-		DIRECTORY PROPERTY "COTIRE_ENABLE_PRECOMPILED_HEADER"
-		BRIEF_DOCS "Modify build command of cotired targets added in this directory to make use of the generated precompiled header."
-		FULL_DOCS
-			"See target property COTIRE_ENABLE_PRECOMPILED_HEADER."
-	)
-
-	define_property(
-		DIRECTORY PROPERTY "COTIRE_ADD_UNITY_BUILD"
-		BRIEF_DOCS "Add a new target that performs a unity build for cotired targets added in this directory."
-		FULL_DOCS
-			"See target property COTIRE_ADD_UNITY_BUILD."
-	)
-
-	define_property(
-		DIRECTORY PROPERTY "COTIRE_ADD_CLEAN"
-		BRIEF_DOCS "Add a new target that cleans all cotire generated files for cotired targets added in this directory."
-		FULL_DOCS
-			"See target property COTIRE_ADD_CLEAN."
-	)
-
-	define_property(
-		DIRECTORY PROPERTY "COTIRE_PREFIX_HEADER_IGNORE_PATH"
-		BRIEF_DOCS "Ignore headers from these directories when generating the prefix header."
-		FULL_DOCS
-			"See target property COTIRE_PREFIX_HEADER_IGNORE_PATH."
-	)
-
-	define_property(
-		DIRECTORY PROPERTY "COTIRE_PREFIX_HEADER_INCLUDE_PATH"
-		BRIEF_DOCS "Honor headers from these directories when generating the prefix header."
-		FULL_DOCS
-			"See target property COTIRE_PREFIX_HEADER_INCLUDE_PATH."
-	)
-
-	define_property(
-		DIRECTORY PROPERTY "COTIRE_PREFIX_HEADER_INCLUDE_PRIORITY_PATH"
-		BRIEF_DOCS "Header paths matching one of these directories are put at the top of the prefix header."
-		FULL_DOCS
-			"See target property COTIRE_PREFIX_HEADER_INCLUDE_PRIORITY_PATH."
-	)
-
-	define_property(
-		DIRECTORY PROPERTY "COTIRE_UNITY_SOURCE_PRE_UNDEFS"
-		BRIEF_DOCS "Preprocessor undefs to place in the generated unity source file before the inclusion of each source file."
-		FULL_DOCS
-			"See target property COTIRE_UNITY_SOURCE_PRE_UNDEFS."
-	)
-
-	define_property(
-		DIRECTORY PROPERTY "COTIRE_UNITY_SOURCE_POST_UNDEFS"
-		BRIEF_DOCS "Preprocessor undefs to place in the generated unity source file after the inclusion of each source file."
-		FULL_DOCS
-			"See target property COTIRE_UNITY_SOURCE_POST_UNDEFS."
-	)
-
-	define_property(
-		DIRECTORY PROPERTY "COTIRE_UNITY_SOURCE_MAXIMUM_NUMBER_OF_INCLUDES"
-		BRIEF_DOCS "Maximum number of source files to include in a single unity source file."
-		FULL_DOCS
-			"See target property COTIRE_UNITY_SOURCE_MAXIMUM_NUMBER_OF_INCLUDES."
-	)
-
-	define_property(
-		DIRECTORY PROPERTY "COTIRE_UNITY_LINK_LIBRARIES_INIT"
-		BRIEF_DOCS "Define strategy for setting up the unity target's link libraries."
-		FULL_DOCS
-			"See target property COTIRE_UNITY_LINK_LIBRARIES_INIT."
-	)
-
-	# define cotire target properties
-
-	define_property(
-		TARGET PROPERTY "COTIRE_ENABLE_PRECOMPILED_HEADER" INHERITED
-		BRIEF_DOCS "Modify this target's build command to make use of the generated precompiled header."
-		FULL_DOCS
-			"If this property is set to TRUE, cotire will modify the build command to make use of the generated precompiled header."
-			"Irrespective of the value of this property, cotire will setup custom commands to generate the unity source and prefix header for the target."
-			"For makefile based generators cotire will also set up a custom target to manually invoke the generation of the precompiled header."
-			"The target name will be set to this target's name with the suffix _pch appended."
-			"Inherited from directory."
-			"Defaults to TRUE."
-	)
-
-	define_property(
-		TARGET PROPERTY "COTIRE_ADD_UNITY_BUILD" INHERITED
-		BRIEF_DOCS "Add a new target that performs a unity build for this target."
-		FULL_DOCS
-			"If this property is set to TRUE, cotire creates a new target of the same type that uses the generated unity source file instead of the target sources."
-			"Most of the relevant target properties will be copied from this target to the new unity build target."
-			"Target dependencies and linked libraries have to be manually set up for the new unity build target."
-			"The unity target name will be set to this target's name with the suffix _unity appended."
-			"Inherited from directory."
-			"Defaults to TRUE."
-	)
-
-	define_property(
-		TARGET PROPERTY "COTIRE_ADD_CLEAN" INHERITED
-		BRIEF_DOCS "Add a new target that cleans all cotire generated files for this target."
-		FULL_DOCS
-			"If this property is set to TRUE, cotire creates a new target that clean all files (unity source, prefix header, precompiled header)."
-			"The clean target name will be set to this target's name with the suffix _clean_cotire appended."
-			"Inherited from directory."
-			"Defaults to FALSE."
-	)
-
-	define_property(
-		TARGET PROPERTY "COTIRE_PREFIX_HEADER_IGNORE_PATH" INHERITED
-		BRIEF_DOCS "Ignore headers from these directories when generating the prefix header."
-		FULL_DOCS
-			"The property can be set to a list of directories."
-			"If a header file is found in one of these directories or sub-directories, it will be excluded from the generated prefix header."
-			"Inherited from directory."
-			"If not set, this property is initialized to \${CMAKE_SOURCE_DIR};\${CMAKE_BINARY_DIR}."
-	)
-
-	define_property(
-		TARGET PROPERTY "COTIRE_PREFIX_HEADER_INCLUDE_PATH" INHERITED
-		BRIEF_DOCS "Honor headers from these directories when generating the prefix header."
-		FULL_DOCS
-			"The property can be set to a list of directories."
-			"If a header file is found in one of these directories or sub-directories, it will be included in the generated prefix header."
-			"If a header file is both selected by COTIRE_PREFIX_HEADER_IGNORE_PATH and COTIRE_PREFIX_HEADER_INCLUDE_PATH,"
-			"the option which yields the closer relative path match wins."
-			"Inherited from directory."
-			"If not set, this property is initialized to the empty list."
-	)
-
-	define_property(
-		TARGET PROPERTY "COTIRE_PREFIX_HEADER_INCLUDE_PRIORITY_PATH" INHERITED
-		BRIEF_DOCS "Header paths matching one of these directories are put at the top of prefix header."
-		FULL_DOCS
-			"The property can be set to a list of directories."
-			"Header file paths matching one of these directories will be inserted at the beginning of the generated prefix header."
-			"Header files are sorted according to the order of the directories in the property."
-			"If not set, this property is initialized to the empty list."
-	)
-
-	define_property(
-		TARGET PROPERTY "COTIRE_UNITY_SOURCE_PRE_UNDEFS" INHERITED
-		BRIEF_DOCS "Preprocessor undefs to place in the generated unity source file before the inclusion of each target source file."
-		FULL_DOCS
-			"This may be set to a semicolon-separated list of preprocessor symbols."
-			"cotire will add corresponding #undef directives to the generated unit source file before each target source file."
-			"Inherited from directory."
-			"Defaults to empty string."
-	)
-
-	define_property(
-		TARGET PROPERTY "COTIRE_UNITY_SOURCE_POST_UNDEFS" INHERITED
-		BRIEF_DOCS "Preprocessor undefs to place in the generated unity source file after the inclusion of each target source file."
-		FULL_DOCS
-			"This may be set to a semicolon-separated list of preprocessor symbols."
-			"cotire will add corresponding #undef directives to the generated unit source file after each target source file."
-			"Inherited from directory."
-			"Defaults to empty string."
-	)
-
-	define_property(
-		TARGET PROPERTY "COTIRE_UNITY_SOURCE_MAXIMUM_NUMBER_OF_INCLUDES" INHERITED
-		BRIEF_DOCS "Maximum number of source files to include in a single unity source file."
-		FULL_DOCS
-			"This may be set to an integer > 0."
-			"If a target contains more than that number of source files, cotire will create multiple unity build files for it."
-			"If not set, cotire will only create a single unity source file."
-			"Inherited from directory."
-			"Defaults to empty."
-	)
-
-	define_property(
-		TARGET PROPERTY "COTIRE_<LANG>_UNITY_SOURCE_INIT"
-		BRIEF_DOCS "User provided unity source file to be used instead of the automatically generated one."
-		FULL_DOCS
-			"If set, cotire will only add the given file(s) to the generated unity source file."
-			"If not set, cotire will add all the target source files to the generated unity source file."
-			"The property can be set to a user provided unity source file."
-			"Defaults to empty."
-	)
-
-	define_property(
-		TARGET PROPERTY "COTIRE_<LANG>_PREFIX_HEADER_INIT"
-		BRIEF_DOCS "User provided prefix header file to be used instead of the automatically generated one."
-		FULL_DOCS
-			"If set, cotire will add the given header file(s) to the generated prefix header file."
-			"If not set, cotire will generate a prefix header by tracking the header files included by the unity source file."
-			"The property can be set to a user provided prefix header file (e.g., stdafx.h)."
-			"Defaults to empty."
-	)
-
-	define_property(
-		TARGET PROPERTY "COTIRE_UNITY_LINK_LIBRARIES_INIT" INHERITED
-		BRIEF_DOCS "Define strategy for setting up unity target's link libraries."
-		FULL_DOCS
-			"If this property is empty or set to NONE, the generated unity target's link libraries have to be set up manually."
-			"If this property is set to COPY, the unity target's link libraries will be copied from this target."
-			"If this property is set to COPY_UNITY, the unity target's link libraries will be copied from this target with considering existing unity targets."
-			"Inherited from directory."
-			"Defaults to empty."
-	)
-
-	define_property(
-		TARGET PROPERTY "COTIRE_<LANG>_UNITY_SOURCE"
-		BRIEF_DOCS "Read-only property. The generated <LANG> unity source file(s)."
-		FULL_DOCS
-			"cotire sets this property to the path of the generated <LANG> single computation unit source file for the target."
-			"Defaults to empty string."
-	)
-
-	define_property(
-		TARGET PROPERTY "COTIRE_<LANG>_PREFIX_HEADER"
-		BRIEF_DOCS "Read-only property. The generated <LANG> prefix header file."
-		FULL_DOCS
-			"cotire sets this property to the full path of the generated <LANG> language prefix header for the target."
-			"Defaults to empty string."
-	)
-
-	define_property(
-		TARGET PROPERTY "COTIRE_<LANG>_PRECOMPILED_HEADER"
-		BRIEF_DOCS "Read-only property. The generated <LANG> precompiled header file."
-		FULL_DOCS
-			"cotire sets this property to the full path of the generated <LANG> language precompiled header binary for the target."
-			"Defaults to empty string."
-	)
-
-	define_property(
-		TARGET PROPERTY "COTIRE_UNITY_TARGET_NAME"
-		BRIEF_DOCS "The name of the generated unity build target corresponding to this target."
-		FULL_DOCS
-			"This property can be set to the desired name of the unity target that will be created by cotire."
-			"If not set, the unity target name will be set to this target's name with the suffix _unity appended."
-			"After this target has been processed by cotire, the property is set to the actual name of the generated unity target."
-			"Defaults to empty string."
-	)
-
-	# define cotire source properties
-
-	define_property(
-		SOURCE PROPERTY "COTIRE_EXCLUDED"
-		BRIEF_DOCS "Do not modify source file's build command."
-		FULL_DOCS
-			"If this property is set to TRUE, the source file's build command will not be modified to make use of the precompiled header."
-			"The source file will also be excluded from the generated unity source file."
-			"Source files that have their COMPILE_FLAGS property set will be excluded by default."
-			"Defaults to FALSE."
-	)
-
-	define_property(
-		SOURCE PROPERTY "COTIRE_DEPENDENCY"
-		BRIEF_DOCS "Add this source file to dependencies of the automatically generated prefix header file."
-		FULL_DOCS
-			"If this property is set to TRUE, the source file is added to dependencies of the generated prefix header file."
-			"If the file is modified, cotire will re-generate the prefix header source upon build."
-			"Defaults to FALSE."
-	)
-
-	define_property(
-		SOURCE PROPERTY "COTIRE_UNITY_SOURCE_PRE_UNDEFS"
-		BRIEF_DOCS "Preprocessor undefs to place in the generated unity source file before the inclusion of this source file."
-		FULL_DOCS
-			"This may be set to a semicolon-separated list of preprocessor symbols."
-			"cotire will add corresponding #undef directives to the generated unit source file before this file is included."
-			"Defaults to empty string."
-	)
-
-	define_property(
-		SOURCE PROPERTY "COTIRE_UNITY_SOURCE_POST_UNDEFS"
-		BRIEF_DOCS "Preprocessor undefs to place in the generated unity source file after the inclusion of this source file."
-		FULL_DOCS
-			"This may be set to a semicolon-separated list of preprocessor symbols."
-			"cotire will add corresponding #undef directives to the generated unit source file after this file is included."
-			"Defaults to empty string."
-	)
-
-	define_property(
-		SOURCE PROPERTY "COTIRE_START_NEW_UNITY_SOURCE"
-		BRIEF_DOCS "Start a new unity source file which includes this source file as the first one."
-		FULL_DOCS
-			"If this property is set to TRUE, cotire will complete the current unity file and start a new one."
-			"The new unity source file will include this source file as the first one."
-			"This property essentially works as a separator for unity source files."
-			"Defaults to FALSE."
-	)
-
-	define_property(
-		SOURCE PROPERTY "COTIRE_TARGET"
-		BRIEF_DOCS "Read-only property. Mark this source file as cotired for the given target."
-		FULL_DOCS
-			"cotire sets this property to the name of target, that the source file's build command has been altered for."
-			"Defaults to empty string."
-	)
-
-	message (STATUS "cotire ${COTIRE_CMAKE_MODULE_VERSION} loaded.")
+    # cotire is being run in include mode
+    # set up all variable and property definitions
+
+    if (NOT DEFINED COTIRE_DEBUG_INIT)
+        if (DEFINED COTIRE_DEBUG)
+            set (COTIRE_DEBUG_INIT ${COTIRE_DEBUG})
+        else()
+            set (COTIRE_DEBUG_INIT FALSE)
+        endif()
+    endif()
+    option (COTIRE_DEBUG "Enable cotire debugging output?" ${COTIRE_DEBUG_INIT})
+
+    if (NOT DEFINED COTIRE_VERBOSE_INIT)
+        if (DEFINED COTIRE_VERBOSE)
+            set (COTIRE_VERBOSE_INIT ${COTIRE_VERBOSE})
+        else()
+            set (COTIRE_VERBOSE_INIT FALSE)
+        endif()
+    endif()
+    option (COTIRE_VERBOSE "Enable cotire verbose output?" ${COTIRE_VERBOSE_INIT})
+
+    set (COTIRE_ADDITIONAL_PREFIX_HEADER_IGNORE_EXTENSIONS "inc;inl;ipp" CACHE STRING
+        "Ignore headers with the listed file extensions from the generated prefix header.")
+
+    set (COTIRE_ADDITIONAL_PREFIX_HEADER_IGNORE_PATH "" CACHE STRING
+        "Ignore headers from these directories when generating the prefix header.")
+
+    set (COTIRE_UNITY_SOURCE_EXCLUDE_EXTENSIONS "m;mm" CACHE STRING
+        "Ignore sources with the listed file extensions from the generated unity source.")
+
+    set (COTIRE_MINIMUM_NUMBER_OF_TARGET_SOURCES "3" CACHE STRING
+        "Minimum number of sources in target required to enable use of precompiled header.")
+
+    if (NOT DEFINED COTIRE_MAXIMUM_NUMBER_OF_UNITY_INCLUDES_INIT)
+        if (DEFINED COTIRE_MAXIMUM_NUMBER_OF_UNITY_INCLUDES)
+            set (COTIRE_MAXIMUM_NUMBER_OF_UNITY_INCLUDES_INIT ${COTIRE_MAXIMUM_NUMBER_OF_UNITY_INCLUDES})
+        elseif ("${CMAKE_GENERATOR}" MATCHES "JOM|Ninja|Visual Studio")
+            # enable parallelization for generators that run multiple jobs by default
+            set (COTIRE_MAXIMUM_NUMBER_OF_UNITY_INCLUDES_INIT "-j")
+        else()
+            set (COTIRE_MAXIMUM_NUMBER_OF_UNITY_INCLUDES_INIT "0")
+        endif()
+    endif()
+    set (COTIRE_MAXIMUM_NUMBER_OF_UNITY_INCLUDES "${COTIRE_MAXIMUM_NUMBER_OF_UNITY_INCLUDES_INIT}" CACHE STRING
+        "Maximum number of source files to include in a single unity source file.")
+
+    if (NOT COTIRE_PREFIX_HEADER_FILENAME_SUFFIX)
+        set (COTIRE_PREFIX_HEADER_FILENAME_SUFFIX "_prefix")
+    endif()
+    if (NOT COTIRE_UNITY_SOURCE_FILENAME_SUFFIX)
+        set (COTIRE_UNITY_SOURCE_FILENAME_SUFFIX "_unity")
+    endif()
+    if (NOT COTIRE_INTDIR)
+        set (COTIRE_INTDIR "cotire")
+    endif()
+    if (NOT COTIRE_PCH_ALL_TARGET_NAME)
+        set (COTIRE_PCH_ALL_TARGET_NAME "all_pch")
+    endif()
+    if (NOT COTIRE_UNITY_BUILD_ALL_TARGET_NAME)
+        set (COTIRE_UNITY_BUILD_ALL_TARGET_NAME "all_unity")
+    endif()
+    if (NOT COTIRE_CLEAN_ALL_TARGET_NAME)
+        set (COTIRE_CLEAN_ALL_TARGET_NAME "clean_cotire")
+    endif()
+    if (NOT COTIRE_CLEAN_TARGET_SUFFIX)
+        set (COTIRE_CLEAN_TARGET_SUFFIX "_clean_cotire")
+    endif()
+    if (NOT COTIRE_PCH_TARGET_SUFFIX)
+        set (COTIRE_PCH_TARGET_SUFFIX "_pch")
+    endif()
+    if (MSVC)
+        # MSVC default PCH memory scaling factor of 100 percent (75 MB) is too small for template heavy C++ code
+        # use a bigger default factor of 170 percent (128 MB)
+        if (NOT DEFINED COTIRE_PCH_MEMORY_SCALING_FACTOR)
+            set (COTIRE_PCH_MEMORY_SCALING_FACTOR "170")
+        endif()
+    endif()
+    if (NOT COTIRE_UNITY_BUILD_TARGET_SUFFIX)
+        set (COTIRE_UNITY_BUILD_TARGET_SUFFIX "_unity")
+    endif()
+    if (NOT DEFINED COTIRE_TARGETS_FOLDER)
+        set (COTIRE_TARGETS_FOLDER "cotire")
+    endif()
+    if (NOT DEFINED COTIRE_UNITY_OUTPUT_DIRECTORY)
+        if ("${CMAKE_GENERATOR}" MATCHES "Ninja")
+            # generated Ninja build files do not work if the unity target produces the same output file as the cotired target
+            set (COTIRE_UNITY_OUTPUT_DIRECTORY "unity")
+        else()
+            set (COTIRE_UNITY_OUTPUT_DIRECTORY "")
+        endif()
+    endif()
+
+    # define cotire cache variables
+
+    define_property(
+        CACHED_VARIABLE PROPERTY "COTIRE_ADDITIONAL_PREFIX_HEADER_IGNORE_PATH"
+        BRIEF_DOCS "Ignore headers from these directories when generating the prefix header."
+        FULL_DOCS
+            "The variable can be set to a semicolon separated list of include directories."
+            "If a header file is found in one of these directories or sub-directories, it will be excluded from the generated prefix header."
+            "If not defined, defaults to empty list."
+    )
+
+    define_property(
+        CACHED_VARIABLE PROPERTY "COTIRE_ADDITIONAL_PREFIX_HEADER_IGNORE_EXTENSIONS"
+        BRIEF_DOCS "Ignore includes with the listed file extensions from the generated prefix header."
+        FULL_DOCS
+            "The variable can be set to a semicolon separated list of file extensions."
+            "If a header file extension matches one in the list, it will be excluded from the generated prefix header."
+            "Includes with an extension in CMAKE_<LANG>_SOURCE_FILE_EXTENSIONS are always ignored."
+            "If not defined, defaults to inc;inl;ipp."
+    )
+
+    define_property(
+        CACHED_VARIABLE PROPERTY "COTIRE_UNITY_SOURCE_EXCLUDE_EXTENSIONS"
+        BRIEF_DOCS "Exclude sources with the listed file extensions from the generated unity source."
+        FULL_DOCS
+            "The variable can be set to a semicolon separated list of file extensions."
+            "If a source file extension matches one in the list, it will be excluded from the generated unity source file."
+            "Source files with an extension in CMAKE_<LANG>_IGNORE_EXTENSIONS are always excluded."
+            "If not defined, defaults to m;mm."
+    )
+
+    define_property(
+        CACHED_VARIABLE PROPERTY "COTIRE_MINIMUM_NUMBER_OF_TARGET_SOURCES"
+        BRIEF_DOCS "Minimum number of sources in target required to enable use of precompiled header."
+        FULL_DOCS
+            "The variable can be set to an integer > 0."
+            "If a target contains less than that number of source files, cotire will not enable the use of the precompiled header for the target."
+            "If not defined, defaults to 3."
+    )
+
+    define_property(
+        CACHED_VARIABLE PROPERTY "COTIRE_MAXIMUM_NUMBER_OF_UNITY_INCLUDES"
+        BRIEF_DOCS "Maximum number of source files to include in a single unity source file."
+        FULL_DOCS
+            "This may be set to an integer >= 0."
+            "If 0, cotire will only create a single unity source file."
+            "If a target contains more than that number of source files, cotire will create multiple unity source files for it."
+            "Can be set to \"-j\" to optimize the count of unity source files for the number of available processor cores."
+            "Can be set to \"-j jobs\" to optimize the number of unity source files for the given number of simultaneous jobs."
+            "Is used to initialize the target property COTIRE_UNITY_SOURCE_MAXIMUM_NUMBER_OF_INCLUDES."
+            "Defaults to \"-j\" for the generators Visual Studio, JOM or Ninja. Defaults to 0 otherwise."
+    )
+
+    # define cotire directory properties
+
+    define_property(
+        DIRECTORY PROPERTY "COTIRE_ENABLE_PRECOMPILED_HEADER"
+        BRIEF_DOCS "Modify build command of cotired targets added in this directory to make use of the generated precompiled header."
+        FULL_DOCS
+            "See target property COTIRE_ENABLE_PRECOMPILED_HEADER."
+    )
+
+    define_property(
+        DIRECTORY PROPERTY "COTIRE_ADD_UNITY_BUILD"
+        BRIEF_DOCS "Add a new target that performs a unity build for cotired targets added in this directory."
+        FULL_DOCS
+            "See target property COTIRE_ADD_UNITY_BUILD."
+    )
+
+    define_property(
+        DIRECTORY PROPERTY "COTIRE_ADD_CLEAN"
+        BRIEF_DOCS "Add a new target that cleans all cotire generated files for cotired targets added in this directory."
+        FULL_DOCS
+            "See target property COTIRE_ADD_CLEAN."
+    )
+
+    define_property(
+        DIRECTORY PROPERTY "COTIRE_PREFIX_HEADER_IGNORE_PATH"
+        BRIEF_DOCS "Ignore headers from these directories when generating the prefix header."
+        FULL_DOCS
+            "See target property COTIRE_PREFIX_HEADER_IGNORE_PATH."
+    )
+
+    define_property(
+        DIRECTORY PROPERTY "COTIRE_PREFIX_HEADER_INCLUDE_PATH"
+        BRIEF_DOCS "Honor headers from these directories when generating the prefix header."
+        FULL_DOCS
+            "See target property COTIRE_PREFIX_HEADER_INCLUDE_PATH."
+    )
+
+    define_property(
+        DIRECTORY PROPERTY "COTIRE_PREFIX_HEADER_INCLUDE_PRIORITY_PATH"
+        BRIEF_DOCS "Header paths matching one of these directories are put at the top of the prefix header."
+        FULL_DOCS
+            "See target property COTIRE_PREFIX_HEADER_INCLUDE_PRIORITY_PATH."
+    )
+
+    define_property(
+        DIRECTORY PROPERTY "COTIRE_UNITY_SOURCE_PRE_UNDEFS"
+        BRIEF_DOCS "Preprocessor undefs to place in the generated unity source file before the inclusion of each source file."
+        FULL_DOCS
+            "See target property COTIRE_UNITY_SOURCE_PRE_UNDEFS."
+    )
+
+    define_property(
+        DIRECTORY PROPERTY "COTIRE_UNITY_SOURCE_POST_UNDEFS"
+        BRIEF_DOCS "Preprocessor undefs to place in the generated unity source file after the inclusion of each source file."
+        FULL_DOCS
+            "See target property COTIRE_UNITY_SOURCE_POST_UNDEFS."
+    )
+
+    define_property(
+        DIRECTORY PROPERTY "COTIRE_UNITY_SOURCE_MAXIMUM_NUMBER_OF_INCLUDES"
+        BRIEF_DOCS "Maximum number of source files to include in a single unity source file."
+        FULL_DOCS
+            "See target property COTIRE_UNITY_SOURCE_MAXIMUM_NUMBER_OF_INCLUDES."
+    )
+
+    define_property(
+        DIRECTORY PROPERTY "COTIRE_UNITY_LINK_LIBRARIES_INIT"
+        BRIEF_DOCS "Define strategy for setting up the unity target's link libraries."
+        FULL_DOCS
+            "See target property COTIRE_UNITY_LINK_LIBRARIES_INIT."
+    )
+
+    # define cotire target properties
+
+    define_property(
+        TARGET PROPERTY "COTIRE_ENABLE_PRECOMPILED_HEADER" INHERITED
+        BRIEF_DOCS "Modify this target's build command to make use of the generated precompiled header."
+        FULL_DOCS
+            "If this property is set to TRUE, cotire will modify the build command to make use of the generated precompiled header."
+            "Irrespective of the value of this property, cotire will setup custom commands to generate the unity source and prefix header for the target."
+            "For makefile based generators cotire will also set up a custom target to manually invoke the generation of the precompiled header."
+            "The target name will be set to this target's name with the suffix _pch appended."
+            "Inherited from directory."
+            "Defaults to TRUE."
+    )
+
+    define_property(
+        TARGET PROPERTY "COTIRE_ADD_UNITY_BUILD" INHERITED
+        BRIEF_DOCS "Add a new target that performs a unity build for this target."
+        FULL_DOCS
+            "If this property is set to TRUE, cotire creates a new target of the same type that uses the generated unity source file instead of the target sources."
+            "Most of the relevant target properties will be copied from this target to the new unity build target."
+            "Target dependencies and linked libraries have to be manually set up for the new unity build target."
+            "The unity target name will be set to this target's name with the suffix _unity appended."
+            "Inherited from directory."
+            "Defaults to TRUE."
+    )
+
+    define_property(
+        TARGET PROPERTY "COTIRE_ADD_CLEAN" INHERITED
+        BRIEF_DOCS "Add a new target that cleans all cotire generated files for this target."
+        FULL_DOCS
+            "If this property is set to TRUE, cotire creates a new target that clean all files (unity source, prefix header, precompiled header)."
+            "The clean target name will be set to this target's name with the suffix _clean_cotire appended."
+            "Inherited from directory."
+            "Defaults to FALSE."
+    )
+
+    define_property(
+        TARGET PROPERTY "COTIRE_PREFIX_HEADER_IGNORE_PATH" INHERITED
+        BRIEF_DOCS "Ignore headers from these directories when generating the prefix header."
+        FULL_DOCS
+            "The property can be set to a list of directories."
+            "If a header file is found in one of these directories or sub-directories, it will be excluded from the generated prefix header."
+            "Inherited from directory."
+            "If not set, this property is initialized to \${CMAKE_SOURCE_DIR};\${CMAKE_BINARY_DIR}."
+    )
+
+    define_property(
+        TARGET PROPERTY "COTIRE_PREFIX_HEADER_INCLUDE_PATH" INHERITED
+        BRIEF_DOCS "Honor headers from these directories when generating the prefix header."
+        FULL_DOCS
+            "The property can be set to a list of directories."
+            "If a header file is found in one of these directories or sub-directories, it will be included in the generated prefix header."
+            "If a header file is both selected by COTIRE_PREFIX_HEADER_IGNORE_PATH and COTIRE_PREFIX_HEADER_INCLUDE_PATH,"
+            "the option which yields the closer relative path match wins."
+            "Inherited from directory."
+            "If not set, this property is initialized to the empty list."
+    )
+
+    define_property(
+        TARGET PROPERTY "COTIRE_PREFIX_HEADER_INCLUDE_PRIORITY_PATH" INHERITED
+        BRIEF_DOCS "Header paths matching one of these directories are put at the top of prefix header."
+        FULL_DOCS
+            "The property can be set to a list of directories."
+            "Header file paths matching one of these directories will be inserted at the beginning of the generated prefix header."
+            "Header files are sorted according to the order of the directories in the property."
+            "If not set, this property is initialized to the empty list."
+    )
+
+    define_property(
+        TARGET PROPERTY "COTIRE_UNITY_SOURCE_PRE_UNDEFS" INHERITED
+        BRIEF_DOCS "Preprocessor undefs to place in the generated unity source file before the inclusion of each target source file."
+        FULL_DOCS
+            "This may be set to a semicolon-separated list of preprocessor symbols."
+            "cotire will add corresponding #undef directives to the generated unit source file before each target source file."
+            "Inherited from directory."
+            "Defaults to empty string."
+    )
+
+    define_property(
+        TARGET PROPERTY "COTIRE_UNITY_SOURCE_POST_UNDEFS" INHERITED
+        BRIEF_DOCS "Preprocessor undefs to place in the generated unity source file after the inclusion of each target source file."
+        FULL_DOCS
+            "This may be set to a semicolon-separated list of preprocessor symbols."
+            "cotire will add corresponding #undef directives to the generated unit source file after each target source file."
+            "Inherited from directory."
+            "Defaults to empty string."
+    )
+
+    define_property(
+        TARGET PROPERTY "COTIRE_UNITY_SOURCE_MAXIMUM_NUMBER_OF_INCLUDES" INHERITED
+        BRIEF_DOCS "Maximum number of source files to include in a single unity source file."
+        FULL_DOCS
+            "This may be set to an integer > 0."
+            "If a target contains more than that number of source files, cotire will create multiple unity build files for it."
+            "If not set, cotire will only create a single unity source file."
+            "Inherited from directory."
+            "Defaults to empty."
+    )
+
+    define_property(
+        TARGET PROPERTY "COTIRE_<LANG>_UNITY_SOURCE_INIT"
+        BRIEF_DOCS "User provided unity source file to be used instead of the automatically generated one."
+        FULL_DOCS
+            "If set, cotire will only add the given file(s) to the generated unity source file."
+            "If not set, cotire will add all the target source files to the generated unity source file."
+            "The property can be set to a user provided unity source file."
+            "Defaults to empty."
+    )
+
+    define_property(
+        TARGET PROPERTY "COTIRE_<LANG>_PREFIX_HEADER_INIT"
+        BRIEF_DOCS "User provided prefix header file to be used instead of the automatically generated one."
+        FULL_DOCS
+            "If set, cotire will add the given header file(s) to the generated prefix header file."
+            "If not set, cotire will generate a prefix header by tracking the header files included by the unity source file."
+            "The property can be set to a user provided prefix header file (e.g., stdafx.h)."
+            "Defaults to empty."
+    )
+
+    define_property(
+        TARGET PROPERTY "COTIRE_UNITY_LINK_LIBRARIES_INIT" INHERITED
+        BRIEF_DOCS "Define strategy for setting up unity target's link libraries."
+        FULL_DOCS
+            "If this property is empty or set to NONE, the generated unity target's link libraries have to be set up manually."
+            "If this property is set to COPY, the unity target's link libraries will be copied from this target."
+            "If this property is set to COPY_UNITY, the unity target's link libraries will be copied from this target with considering existing unity targets."
+            "Inherited from directory."
+            "Defaults to empty."
+    )
+
+    define_property(
+        TARGET PROPERTY "COTIRE_<LANG>_UNITY_SOURCE"
+        BRIEF_DOCS "Read-only property. The generated <LANG> unity source file(s)."
+        FULL_DOCS
+            "cotire sets this property to the path of the generated <LANG> single computation unit source file for the target."
+            "Defaults to empty string."
+    )
+
+    define_property(
+        TARGET PROPERTY "COTIRE_<LANG>_PREFIX_HEADER"
+        BRIEF_DOCS "Read-only property. The generated <LANG> prefix header file."
+        FULL_DOCS
+            "cotire sets this property to the full path of the generated <LANG> language prefix header for the target."
+            "Defaults to empty string."
+    )
+
+    define_property(
+        TARGET PROPERTY "COTIRE_<LANG>_PRECOMPILED_HEADER"
+        BRIEF_DOCS "Read-only property. The generated <LANG> precompiled header file."
+        FULL_DOCS
+            "cotire sets this property to the full path of the generated <LANG> language precompiled header binary for the target."
+            "Defaults to empty string."
+    )
+
+    define_property(
+        TARGET PROPERTY "COTIRE_UNITY_TARGET_NAME"
+        BRIEF_DOCS "The name of the generated unity build target corresponding to this target."
+        FULL_DOCS
+            "This property can be set to the desired name of the unity target that will be created by cotire."
+            "If not set, the unity target name will be set to this target's name with the suffix _unity appended."
+            "After this target has been processed by cotire, the property is set to the actual name of the generated unity target."
+            "Defaults to empty string."
+    )
+
+    # define cotire source properties
+
+    define_property(
+        SOURCE PROPERTY "COTIRE_EXCLUDED"
+        BRIEF_DOCS "Do not modify source file's build command."
+        FULL_DOCS
+            "If this property is set to TRUE, the source file's build command will not be modified to make use of the precompiled header."
+            "The source file will also be excluded from the generated unity source file."
+            "Source files that have their COMPILE_FLAGS property set will be excluded by default."
+            "Defaults to FALSE."
+    )
+
+    define_property(
+        SOURCE PROPERTY "COTIRE_DEPENDENCY"
+        BRIEF_DOCS "Add this source file to dependencies of the automatically generated prefix header file."
+        FULL_DOCS
+            "If this property is set to TRUE, the source file is added to dependencies of the generated prefix header file."
+            "If the file is modified, cotire will re-generate the prefix header source upon build."
+            "Defaults to FALSE."
+    )
+
+    define_property(
+        SOURCE PROPERTY "COTIRE_UNITY_SOURCE_PRE_UNDEFS"
+        BRIEF_DOCS "Preprocessor undefs to place in the generated unity source file before the inclusion of this source file."
+        FULL_DOCS
+            "This may be set to a semicolon-separated list of preprocessor symbols."
+            "cotire will add corresponding #undef directives to the generated unit source file before this file is included."
+            "Defaults to empty string."
+    )
+
+    define_property(
+        SOURCE PROPERTY "COTIRE_UNITY_SOURCE_POST_UNDEFS"
+        BRIEF_DOCS "Preprocessor undefs to place in the generated unity source file after the inclusion of this source file."
+        FULL_DOCS
+            "This may be set to a semicolon-separated list of preprocessor symbols."
+            "cotire will add corresponding #undef directives to the generated unit source file after this file is included."
+            "Defaults to empty string."
+    )
+
+    define_property(
+        SOURCE PROPERTY "COTIRE_START_NEW_UNITY_SOURCE"
+        BRIEF_DOCS "Start a new unity source file which includes this source file as the first one."
+        FULL_DOCS
+            "If this property is set to TRUE, cotire will complete the current unity file and start a new one."
+            "The new unity source file will include this source file as the first one."
+            "This property essentially works as a separator for unity source files."
+            "Defaults to FALSE."
+    )
+
+    define_property(
+        SOURCE PROPERTY "COTIRE_TARGET"
+        BRIEF_DOCS "Read-only property. Mark this source file as cotired for the given target."
+        FULL_DOCS
+            "cotire sets this property to the name of target, that the source file's build command has been altered for."
+            "Defaults to empty string."
+    )
+
+    message (STATUS "cotire ${COTIRE_CMAKE_MODULE_VERSION} loaded.")

 endif()