]> sigrok.org Git - pulseview.git/commitdiff
Used cotire to enhance build performance
authorJoel Holdsworth <redacted>
Sun, 7 Jul 2013 15:15:42 +0000 (16:15 +0100)
committerJoel Holdsworth <redacted>
Tue, 3 Sep 2013 11:50:48 +0000 (12:50 +0100)
Cotire (compile time reducer) is a CMake module that speeds up the
build process of CMake based build systems by fully automating
techniques as precompiled header usage and single compilation unit
builds for C and C++.

Cotire is released under the MIT license.

CMake/cotire.cmake [new file with mode: 0644]
CMakeLists.txt

diff --git a/CMake/cotire.cmake b/CMake/cotire.cmake
new file mode 100644 (file)
index 0000000..a6e3141
--- /dev/null
@@ -0,0 +1,3185 @@
+# - cotire (compile time reducer)
+#
+# See the cotire manual for usage hints.
+#
+#=============================================================================
+# Copyright 2012-2013 Sascha Kratky
+#
+# Permission is hereby granted, free of charge, to any person
+# obtaining a copy of this software and associated documentation
+# files (the "Software"), to deal in the Software without
+# restriction, including without limitation the rights to use,
+# copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the
+# Software is furnished to do so, subject to the following
+# conditions:
+#
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+# OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+# HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+# OTHER DEALINGS IN THE SOFTWARE.
+#=============================================================================
+
+if(__COTIRE_INCLUDED)
+       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)
+endif()
+# we need the CMake variables CMAKE_SCRIPT_MODE_FILE and CMAKE_ARGV available since 2.8.5
+# we need APPEND_STRING option for set_property available since 2.8.6
+cmake_minimum_required(VERSION 2.8.6)
+if (NOT CMAKE_SCRIPT_MODE_FILE)
+       cmake_policy(POP)
+endif()
+
+set (COTIRE_CMAKE_MODULE_FILE "${CMAKE_CURRENT_LIST_FILE}")
+set (COTIRE_CMAKE_MODULE_VERSION "1.4.1")
+
+include(CMakeParseArguments)
+include(ProcessorCount)
+
+function (cotire_determine_compiler_version _language _versionPrefix)
+       if (NOT ${_versionPrefix}_VERSION)
+               # use CMake's predefined compiler version variable (available since CMake 2.8.8)
+               if (DEFINED CMAKE_${_language}_COMPILER_VERSION)
+                       set (${_versionPrefix}_VERSION "${CMAKE_${_language}_COMPILER_VERSION}")
+               elseif (WIN32)
+                       # cl.exe messes with the output streams unless the environment variable VS_UNICODE_OUTPUT is cleared
+                       unset (ENV{VS_UNICODE_OUTPUT})
+                       string (STRIP "${CMAKE_${_language}_COMPILER_ARG1}" _compilerArg1)
+                       execute_process (COMMAND ${CMAKE_${_language}_COMPILER} ${_compilerArg1}
+                               ERROR_VARIABLE _versionLine OUTPUT_QUIET TIMEOUT 10)
+                       string (REGEX REPLACE ".*Version *([0-9]+(\\.[0-9]+)*).*" "\\1" ${_versionPrefix}_VERSION "${_versionLine}")
+               else()
+                       # assume GCC like command line interface
+                       string (STRIP "${CMAKE_${_language}_COMPILER_ARG1}" _compilerArg1)
+                       execute_process (COMMAND ${CMAKE_${_language}_COMPILER} ${_compilerArg1} "-dumpversion"
+                               OUTPUT_VARIABLE ${_versionPrefix}_VERSION
+                               RESULT_VARIABLE _result
+                               OUTPUT_STRIP_TRAILING_WHITESPACE TIMEOUT 10)
+                       if (_result)
+                               set (${_versionPrefix}_VERSION "")
+                       endif()
+               endif()
+               if (${_versionPrefix}_VERSION)
+                       set (${_versionPrefix}_VERSION "${${_versionPrefix}_VERSION}" CACHE INTERNAL "${_language} compiler version")
+               endif()
+               set (${_versionPrefix}_VERSION "${${_versionPrefix}_VERSION}" PARENT_SCOPE)
+               if (COTIRE_DEBUG)
+                       message (STATUS "${CMAKE_${_language}_COMPILER} version ${${_versionPrefix}_VERSION}")
+               endif()
+       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} "${_sourceExt}" PARENT_SCOPE)
+endfunction()
+
+macro (cotire_check_is_path_relative_to _path _isRelativeVar)
+       set (${_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()
+endmacro()
+
+function (cotire_filter_language_source_files _language _sourceFilesVar _excludedSourceFilesVar _cotiredSourceFilesVar)
+       set (_sourceFiles "")
+       set (_excludedSourceFiles "")
+       set (_cotiredSourceFiles "")
+       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 "${COTIRE_UNITY_SOURCE_EXCLUDE_EXTENSIONS}")
+       else()
+               set (_excludeExtensions "")
+       endif()
+       if (COTIRE_DEBUG)
+               message (STATUS "${_language} source file extensions: ${_languageExtensions}")
+               message (STATUS "${_language} ignore extensions: ${_ignoreExtensions}")
+               message (STATUS "${_language} exclude extensions: ${_excludeExtensions}")
+       endif()
+       foreach (_sourceFile ${ARGN})
+               get_source_file_property(_sourceIsHeaderOnly "${_sourceFile}" HEADER_FILE_ONLY)
+               get_source_file_property(_sourceIsExternal "${_sourceFile}" EXTERNAL_OBJECT)
+               get_source_file_property(_sourceIsSymbolic "${_sourceFile}" SYMBOLIC)
+               get_source_file_property(_sourceLanguage "${_sourceFile}" LANGUAGE)
+               set (_sourceIsFiltered FALSE)
+               if (NOT _sourceIsHeaderOnly AND NOT _sourceIsExternal AND NOT _sourceIsSymbolic)
+                       cotire_get_source_file_extension("${_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)
+                                                       set (_sourceIsFiltered TRUE)
+                                               elseif ("${_sourceLanguage}" STREQUAL "${_language}")
+                                                       # add to excluded sources, if file is not ignored and has correct language without having the correct extension
+                                                       list (APPEND _excludedSourceFiles "${_sourceFile}")
+                                               endif()
+                                       endif()
+                               endif()
+                       endif()
+               endif()
+               if (COTIRE_DEBUG)
+                       message (STATUS "${_sourceFile} filtered=${_sourceIsFiltered} language=${_sourceLanguage} header=${_sourceIsHeaderOnly}")
+               endif()
+               if (_sourceIsFiltered)
+                       get_source_file_property(_sourceIsExcluded "${_sourceFile}" COTIRE_EXCLUDED)
+                       get_source_file_property(_sourceIsCotired "${_sourceFile}" COTIRE_TARGET)
+                       get_source_file_property(_sourceCompileFlags "${_sourceFile}" COMPILE_FLAGS)
+                       if (COTIRE_DEBUG)
+                               message (STATUS "${_sourceFile} excluded=${_sourceIsExcluded} cotired=${_sourceIsCotired}")
+                       endif()
+                       if (_sourceIsCotired)
+                               list (APPEND _cotiredSourceFiles "${_sourceFile}")
+                       elseif (_sourceIsExcluded OR _sourceCompileFlags)
+                               list (APPEND _excludedSourceFiles "${_sourceFile}")
+                       else()
+                               list (APPEND _sourceFiles "${_sourceFile}")
+                       endif()
+               endif()
+       endforeach()
+       if (COTIRE_DEBUG)
+               message (STATUS "All: ${ARGN}")
+               message (STATUS "${_language}: ${_sourceFiles}")
+               message (STATUS "Excluded: ${_excludedSourceFiles}")
+               message (STATUS "Cotired: ${_cotiredSourceFiles}")
+       endif()
+       set (${_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)
+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)
+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)
+endfunction()
+
+function (cotrie_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} ${_properties} PARENT_SCOPE)
+endfunction()
+
+function (cotrie_copy_set_properites _configurations _type _source _target)
+       cotrie_resolve_config_properites("${_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_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)
+               message (STATUS "Filter ${_flagFilter}")
+               if (_matchedOptions)
+                       message (STATUS "Matched ${_matchedOptions}")
+               endif()
+               if (_unmatchedOptions)
+                       message (STATUS "Unmatched ${_unmatchedOptions}")
+               endif()
+       endif()
+       set (${_matchedOptionsVar} ${_matchedOptions} PARENT_SCOPE)
+       set (${_unmatchedOptionsVar} ${_unmatchedOptions} PARENT_SCOPE)
+endfunction()
+
+function (cotire_get_target_compile_flags _config _language _directory _target _flagsVar)
+       string (TOUPPER "${_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 option from CMake target type variable
+               get_target_property(_targetType ${_target} TYPE)
+               if (POLICY CMP0018)
+                       # handle POSITION_INDEPENDENT_CODE property introduced with CMake 2.8.9 if policy CMP0018 is turned on
+                       cmake_policy(GET CMP0018 _PIC_Policy)
+               else()
+                       # default to old behavior
+                       set (_PIC_Policy "OLD")
+               endif()
+               if (COTIRE_DEBUG)
+                       message(STATUS "CMP0018=${_PIC_Policy}")
+               endif()
+               if (_PIC_Policy STREQUAL "NEW")
+                       # NEW behavior: honor the POSITION_INDEPENDENT_CODE target property
+                       get_target_property(_targetPIC ${_target} POSITION_INDEPENDENT_CODE)
+                       if (_targetPIC)
+                               if (_targetType STREQUAL "EXECUTABLE" AND CMAKE_${_language}_COMPILE_OPTIONS_PIE)
+                                       set (_compileFlags "${_compileFlags} ${CMAKE_${_language}_COMPILE_OPTIONS_PIE}")
+                               elseif (CMAKE_${_language}_COMPILE_OPTIONS_PIC)
+                                       set (_compileFlags "${_compileFlags} ${CMAKE_${_language}_COMPILE_OPTIONS_PIC}")
+                               endif()
+                       endif()
+               else()
+                       # OLD behavior or policy not set: use the value of CMAKE_SHARED_LIBRARY_<Lang>_FLAGS
+                       if (_targetType STREQUAL "MODULE_LIBRARY")
+                               # flags variable for module library uses different name SHARED_MODULE
+                               # (e.g., CMAKE_SHARED_MODULE_C_FLAGS)
+                               set (_targetType SHARED_MODULE)
+                       endif()
+                       if (CMAKE_${_targetType}_${_language}_FLAGS)
+                               set (_compileFlags "${_compileFlags} ${CMAKE_${_targetType}_${_language}_FLAGS}")
+                       endif()
+               endif()
+       endif()
+       if (_directory)
+               # add_definitions may have been used to add flags to the compiler command
+               get_directory_property(_dirDefinitions DIRECTORY "${_directory}" DEFINITIONS)
+               if (_dirDefinitions)
+                       set (_compileFlags "${_compileFlags} ${_dirDefinitions}")
+               endif()
+       endif()
+       if (_target)
+               # add target compile options
+               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()
+       # platform specific flags
+       if (APPLE)
+               get_target_property(_architectures ${_target} OSX_ARCHITECTURES_${_upperConfig})
+               if (NOT _architectures)
+                       get_target_property(_architectures ${_target} OSX_ARCHITECTURES)
+               endif()
+               foreach (_arch ${_architectures})
+                       list (APPEND _compileFlags "-arch" "${_arch}")
+               endforeach()
+               if (CMAKE_OSX_SYSROOT AND CMAKE_OSX_SYSROOT_DEFAULT AND CMAKE_${_language}_HAS_ISYSROOT)
+                       if (NOT "${CMAKE_OSX_SYSROOT}" STREQUAL "${CMAKE_OSX_SYSROOT_DEFAULT}")
+                               list (APPEND _compileFlags "-isysroot" "${CMAKE_OSX_SYSROOT}")
+                       endif()
+               endif()
+               if (CMAKE_OSX_DEPLOYMENT_TARGET AND CMAKE_${_language}_OSX_DEPLOYMENT_TARGET_FLAG)
+                       list (APPEND _compileFlags "${CMAKE_${_language}_OSX_DEPLOYMENT_TARGET_FLAG}${CMAKE_OSX_DEPLOYMENT_TARGET}")
+               endif()
+       endif()
+       if (COTIRE_DEBUG AND _compileFlags)
+               message (STATUS "Target ${_target} compile flags ${_compileFlags}")
+       endif()
+       set (${_flagsVar} ${_compileFlags} PARENT_SCOPE)
+endfunction()
+
+function (cotire_get_target_include_directories _config _language _targetSourceDir _targetBinaryDir _target _includeDirsVar)
+       set (_includeDirs "")
+       # default include dirs
+       if (CMAKE_INCLUDE_CURRENT_DIR)
+               list (APPEND _includeDirs "${_targetBinaryDir}")
+               list (APPEND _includeDirs "${_targetSourceDir}")
+       endif()
+       # parse additional include directories from target compile flags
+       set (_targetFlags "")
+       cotire_get_target_compile_flags("${_config}" "${_language}" "${_targetSourceDir}" "${_target}" _targetFlags)
+       cotire_filter_compile_flags("${_language}" "I" _dirs _ignore ${_targetFlags})
+       if (_dirs)
+               list (APPEND _includeDirs ${_dirs})
+       endif()
+       # target include directories
+       get_directory_property(_dirs DIRECTORY "${_targetSourceDir}" INCLUDE_DIRECTORIES)
+       if (_target)
+               get_target_property(_targetDirs ${_target} INCLUDE_DIRECTORIES)
+               if (_targetDirs)
+                       list (APPEND _dirs ${_targetDirs})
+                       list (REMOVE_DUPLICATES _dirs)
+               endif()
+       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 "${_dir}")
+               endif()
+       endforeach()
+       list (REMOVE_DUPLICATES _includeDirs)
+       if (CMAKE_${_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} ${_includeDirs} PARENT_SCOPE)
+endfunction()
+
+macro (cotire_make_C_identifier _identifierVar _str)
+       # mimic CMake SystemTools::MakeCindentifier behavior
+       if ("${_str}" MATCHES "^[0-9].+$")
+               set (_str "_${str}")
+       endif()
+       string (REGEX REPLACE "[^a-zA-Z0-9]" "_" ${_identifierVar} "${_str}")
+endmacro()
+
+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()
+               cotire_make_C_identifier(_exportSymbol "${_exportSymbol}")
+       endif()
+       set (${_exportSymbolVar} ${_exportSymbol} PARENT_SCOPE)
+endfunction()
+
+function (cotire_get_target_compile_definitions _config _language _directory _target _definitionsVar)
+       string (TOUPPER "${_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 "${_directory}" COMPILE_DEFINITIONS)
+       if (_definitions)
+               list (APPEND _configDefinitions ${_definitions})
+       endif()
+       get_directory_property(_definitions DIRECTORY "${_directory}" 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 ${_definitions})
+       endif()
+       # parse additional compile definitions from target compile flags
+       # and don't look at directory compile definitions, which we already handled
+       set (_targetFlags "")
+       cotire_get_target_compile_flags("${_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} ${_configDefinitions} PARENT_SCOPE)
+endfunction()
+
+function (cotire_get_target_compiler_flags _config _language _directory _target _compilerFlagsVar)
+       # parse target compile flags omitting compile definitions and include directives
+       set (_targetFlags "")
+       cotire_get_target_compile_flags("${_config}" "${_language}" "${_directory}" "${_target}" _targetFlags)
+       set (_compilerFlags "")
+       cotire_filter_compile_flags("${_language}" "[ID]" _ignore _compilerFlags ${_targetFlags})
+       if (COTIRE_DEBUG AND _compilerFlags)
+               message (STATUS "Target ${_target} compiler flags ${_compilerFlags}")
+       endif()
+       set (${_compilerFlagsVar} ${_compilerFlags} PARENT_SCOPE)
+endfunction()
+
+function (cotire_add_sys_root_paths _pathsVar)
+       if (APPLE)
+               if (CMAKE_OSX_SYSROOT AND CMAKE_${_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 (COTIRE_DEBUG)
+               message (STATUS "${_pathsVar}=${${_pathsVar}}")
+       endif()
+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} ${_result} PARENT_SCOPE)
+endfunction()
+
+function (cotire_get_source_compile_definitions _config _language _sourceFile _definitionsVar)
+       set (_compileDefinitions "")
+       if (NOT CMAKE_SCRIPT_MODE_FILE)
+               string (TOUPPER "${_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)
+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} ${_configDefinitions} PARENT_SCOPE)
+endfunction()
+
+function (cotire_get_source_undefs _sourceFile _property _sourceUndefsVar)
+       set (_sourceUndefs "")
+       if (NOT CMAKE_SCRIPT_MODE_FILE)
+               get_source_file_property(_undefs "${_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)
+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} ${_sourceUndefs} PARENT_SCOPE)
+endfunction()
+
+macro (cotire_set_cmd_to_prologue _cmdVar)
+       set (${_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()
+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)
+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()
+endmacro()
+
+macro (cotire_add_includes_to_cmd _cmdVar _language)
+       foreach (_include ${ARGN})
+               if (WIN32 AND CMAKE_${_language}_COMPILER_ID MATCHES "MSVC|Intel")
+                       file (TO_NATIVE_PATH "${_include}" _include)
+                       list (APPEND ${_cmdVar} "/I${_include}")
+               else()
+                       list (APPEND ${_cmdVar} "-I${_include}")
+               endif()
+       endforeach()
+endmacro()
+
+macro (cotire_add_compile_flags_to_cmd _cmdVar)
+       foreach (_flag ${ARGN})
+               list (APPEND ${_cmdVar} "${_flag}")
+       endforeach()
+endmacro()
+
+function (cotire_check_file_up_to_date _fileIsUpToDateVar _file)
+       set (${_fileIsUpToDateVar} FALSE PARENT_SCOPE)
+       set (_triggerFile "")
+       foreach (_dependencyFile ${ARGN})
+               if (EXISTS "${_dependencyFile}" AND "${_dependencyFile}" IS_NEWER_THAN "${_file}")
+                       set (_triggerFile "${_dependencyFile}")
+                       break()
+               endif()
+       endforeach()
+       get_filename_component(_fileName "${_file}" NAME)
+       if (EXISTS "${_file}")
+               if (_triggerFile)
+                       if (COTIRE_VERBOSE)
+                               message (STATUS "${_fileName} update triggered by ${_triggerFile} change.")
+                       endif()
+               else()
+                       if (COTIRE_VERBOSE)
+                               message (STATUS "${_fileName} is up-to-date.")
+                       endif()
+                       set (${_fileIsUpToDateVar} TRUE PARENT_SCOPE)
+               endif()
+       else()
+               if (COTIRE_VERBOSE)
+                       message (STATUS "${_fileName} does not exist yet.")
+               endif()
+       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_check_header_file_location _headerFile _insideIncudeDirs _outsideIncudeDirs _headerIsInside)
+       # check header path against ignored and honored include directories
+       cotire_find_closest_relative_path("${_headerFile}" "${_insideIncudeDirs}" _insideRelPath)
+       if (_insideRelPath)
+               # header is inside, but could be become outside if there is a shorter outside match
+               cotire_find_closest_relative_path("${_headerFile}" "${_outsideIncudeDirs}" _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()
+
+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 (${_headerIsIgnoredVar} FALSE)
+       endif()
+endmacro()
+
+macro (cotire_check_ignore_header_file_ext _headerFile _ignoreExtensionsVar _headerIsIgnoredVar)
+       # check header file extension
+       cotire_get_source_file_extension("${_headerFile}" _headerFileExt)
+       set (${_headerIsIgnoredVar} FALSE)
+       if (_headerFileExt)
+               list (FIND ${_ignoreExtensionsVar} "${_headerFileExt}" _index)
+               if (_index GREATER -1)
+                       set (${_headerIsIgnoredVar} TRUE)
+               endif()
+       endif()
+endmacro()
+
+macro (cotire_parse_line _line _headerFileVar _headerDepthVar)
+       if (MSVC)
+               # cl.exe /showIncludes output looks different depending on the language pack used, e.g.:
+               # English: "Note: including file:   C:\directory\file"
+               # German: "Hinweis: Einlesen der Datei:   C:\directory\file"
+               # We use a very general regular expression, relying on the presence of the : characters
+               if ("${_line}" MATCHES ":( +)([^:]+:[^:]+)$")
+                       # Visual Studio compiler output
+                       string (LENGTH "${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()
+
+function (cotire_parse_includes _language _scanOutput _ignoredIncudeDirs _honoredIncudeDirs _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)
+               message (STATUS "Scanning ${_uniqueLen} unique lines of ${_len} for includes")
+               if (_ignoredExtensions)
+                       message (STATUS "Ignored extensions: ${_ignoredExtensions}")
+               endif()
+               if (_ignoredIncudeDirs)
+                       message (STATUS "Ignored paths: ${_ignoredIncudeDirs}")
+               endif()
+               if (_honoredIncudeDirs)
+                       message (STATUS "Included paths: ${_honoredIncudeDirs}")
+               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("${_headerFile}" "${_ignoredIncudeDirs}" "${_honoredIncudeDirs}" _headerIsInside)
+                               if (COTIRE_DEBUG)
+                                       message (STATUS "${_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} ${_unparsedLines} PARENT_SCOPE)
+endfunction()
+
+function (cotire_scan_includes _includesVar)
+       set(_options "")
+       set(_oneValueArgs COMPILER_ID COMPILER_EXECUTABLE COMPILER_VERSION LANGUAGE UNPARSED_LINES)
+       set(_multiValueArgs COMPILE_DEFINITIONS COMPILE_FLAGS INCLUDE_DIRECTORIES IGNORE_PATH INCLUDE_PATH IGNORE_EXTENSIONS)
+       cmake_parse_arguments(_option "${_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_${_option_LANGUAGE}_ID}")
+       endif()
+       set (_cmd "${_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}" ${_option_INCLUDE_DIRECTORIES})
+       cotire_add_makedep_flags("${_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")
+               if (COTIRE_DEBUG)
+                       message (STATUS "clearing VS_UNICODE_OUTPUT")
+               endif()
+               # 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
+               ${_sourceFiles})
+       set (${_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 ${_definition}")
+               endforeach()
+       endif()
+endmacro()
+
+macro (cotire_comment_str _language _commentText _commentVar)
+       if ("${_language}" STREQUAL "CMAKE")
+               set (${_commentVar} "# ${_commentText}")
+       else()
+               set (${_commentVar} "/* ${_commentText} */")
+       endif()
+endmacro()
+
+function (cotire_write_file _language _file _contents _force)
+       get_filename_component(_moduleName "${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()
+               get_filename_component(_sourceFile "${_sourceFile}" ABSOLUTE)
+               if (WIN32)
+                       file (TO_NATIVE_PATH "${_sourceFile}" _sourceFile)
+               endif()
+               list (APPEND _contents "#include \"${_sourceFile}\"")
+       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 IGNORE_PATH INCLUDE_PATH IGNORE_EXTENSIONS)
+       cmake_parse_arguments(_option "${_options}" "${_oneValueArgs}" "${_multiValueArgs}" ${ARGN})
+       if (_option_DEPENDS)
+               cotire_check_file_up_to_date(_prefixFileIsUpToDate "${_prefixFile}" ${_option_DEPENDS})
+               if (_prefixFileIsUpToDate)
+                       return()
+               endif()
+       endif()
+       set (_epilogue "")
+       if (_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}
+               IGNORE_PATH ${_option_IGNORE_PATH}
+               INCLUDE_PATH ${_option_INCLUDE_PATH}
+               IGNORE_EXTENSIONS ${_option_IGNORE_EXTENSIONS}
+               UNPARSED_LINES _unparsedLines)
+       cotire_generate_unity_source("${_prefixFile}" EPILOGUE ${_epilogue} LANGUAGE "${_option_LANGUAGE}" ${_selectedHeaders})
+       set (_unparsedLinesFile "${_prefixFile}.log")
+       if (_unparsedLines)
+               if (COTIRE_VERBOSE OR NOT _selectedHeaders)
+                       list (LENGTH _unparsedLines _skippedLineCount)
+                       file (RELATIVE_PATH _unparsedLinesFileRelPath "${CMAKE_BINARY_DIR}" "${_unparsedLinesFile}")
+                       message (STATUS "${_skippedLineCount} line(s) skipped, see ${_unparsedLinesFileRelPath}")
+               endif()
+               string (REPLACE ";" "\n" _unparsedLines "${_unparsedLines}")
+       endif()
+       file (WRITE "${_unparsedLinesFile}" "${_unparsedLines}\n")
+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 "${_flags} -fdirectives-only")
+                       endif()
+               endif()
+       elseif (_compilerID MATCHES "Clang")
+               # Clang options used
+               # -H print the name of each header file used
+               # -E invoke preprocessor
+               if (_flags)
+                       # append to list
+                       list (APPEND _flags -H -E)
+               else()
+                       # return as a flag string
+                       set (_flags "-H -E")
+               endif()
+       elseif (_compilerID MATCHES "Intel")
+               if (WIN32)
+                       # Windows Intel options used
+                       # /nologo do not display compiler version information
+                       # /QH display the include file order
+                       # /EP preprocess to stdout, omitting #line directives
+                       # /TC process all source or unrecognized file types as C source files
+                       # /TP process all source or unrecognized file types as C++ source files
+                       set (_sourceFileTypeC "/TC")
+                       set (_sourceFileTypeCXX "/TP")
+                       if (_flags)
+                               # append to list
+                               list (APPEND _flags /nologo "${_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 "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 "${_hostFile}" _hostFileNative)
+               # cl.exe options used
+               # /Yc creates a precompiled header file
+               # /Fp specifies precompiled header binary file name
+               # /FI forces inclusion of file
+               # /TC treat all files named on the command line as C source files
+               # /TP treat all files named on the command line as C++ source files
+               # /Zs syntax check only
+               set (_sourceFileTypeC "/TC")
+               set (_sourceFileTypeCXX "/TP")
+               if (_flags)
+                       # append to list
+                       list (APPEND _flags /nologo "${_sourceFileType${_language}}"
+                               "/Yc${_prefixFileNative}" "/Fp${_pchFileNative}" "/FI${_prefixFileNative}" /Zs "${_hostFileNative}")
+               else()
+                       # return as a flag string
+                       set (_flags "/Yc\"${_prefixFileNative}\" /Fp\"${_pchFileNative}\" /FI\"${_prefixFileNative}\"")
+               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
+               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 "Unsupported ${_language} compiler ${_compilerID} version ${_compilerVersion}.")
+       endif()
+       set (${_flagsVar} ${_flags} PARENT_SCOPE)
+endfunction()
+
+function (cotire_add_pch_inclusion_flags _language _compilerID _compilerVersion _prefixFile _pchFile _flagsVar)
+       set (_flags ${${_flagsVar}})
+       if (_compilerID MATCHES "MSVC")
+               file (TO_NATIVE_PATH "${_prefixFile}" _prefixFileNative)
+               file (TO_NATIVE_PATH "${_pchFile}" _pchFileNative)
+               # cl.exe options used
+               # /Yu uses a precompiled header file during build
+               # /Fp specifies precompiled header binary file name
+               # /FI forces inclusion of file
+               if (_flags)
+                       # append to list
+                       list (APPEND _flags "/Yu${_prefixFileNative}" "/Fp${_pchFileNative}" "/FI${_prefixFileNative}")
+               else()
+                       # return as a flag string
+                       set (_flags "/Yu\"${_prefixFileNative}\" /Fp\"${_pchFileNative}\" /FI\"${_prefixFileNative}\"")
+               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
+               if (_flags)
+                       # append to list
+                       list (APPEND _flags "-include" "${_prefixFile}" "-Winvalid-pch")
+               else()
+                       # return as a flag string
+                       set (_flags "-include \"${_prefixFile}\" -Winvalid-pch")
+               endif()
+       elseif (_compilerID MATCHES "Clang")
+               # Clang options used
+               # -include process include file as the first line of the primary source file
+               # -Qunused-arguments don't emit warning for unused driver arguments
+               if (_flags)
+                       # append to list
+                       list (APPEND _flags "-include" "${_prefixFile}" "-Qunused-arguments")
+               else()
+                       # return as a flag string
+                       set (_flags "-include \"${_prefixFile}\" -Qunused-arguments")
+               endif()
+       elseif (_compilerID MATCHES "Intel")
+               if (WIN32)
+                       file (TO_NATIVE_PATH "${_prefixFile}" _prefixFileNative)
+                       file (TO_NATIVE_PATH "${_pchFile}" _pchFileNative)
+                       # 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 (_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 "${_flags} /Wpch-messages")
+                               endif()
+                       endif()
+               else()
+                       # Linux / Mac OS X Intel options used
+                       # -pch-dir location for precompiled header files
+                       # -pch-use name of the precompiled header (PCH) to use
+                       # -include process include file as the first line of the primary source file
+                       # -Wpch-messages enable diagnostics related to pre-compiled headers (requires Intel XE 2013 Update 2)
+                       get_filename_component(_pchDir "${_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()
+               endif()
+       else()
+               message (FATAL_ERROR "Unsupported ${_language} compiler ${_compilerID} version ${_compilerVersion}.")
+       endif()
+       set (${_flagsVar} ${_flags} PARENT_SCOPE)
+endfunction()
+
+function (cotire_precompile_prefix_header _prefixFile _pchFile _hostFile)
+       set(_options "")
+       set(_oneValueArgs COMPILER_EXECUTABLE COMPILER_ID COMPILER_VERSION LANGUAGE)
+       set(_multiValueArgs COMPILE_DEFINITIONS COMPILE_FLAGS INCLUDE_DIRECTORIES)
+       cmake_parse_arguments(_option "${_options}" "${_oneValueArgs}" "${_multiValueArgs}" ${ARGN})
+       if (NOT _option_LANGUAGE)
+               set (_option_LANGUAGE "CXX")
+       endif()
+       if (NOT _option_COMPILER_ID)
+               set (_option_COMPILER_ID "${CMAKE_${_option_LANGUAGE}_ID}")
+       endif()
+       cotire_init_compile_cmd(_cmd "${_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}" ${_option_INCLUDE_DIRECTORIES})
+       cotire_add_pch_compilation_flags(
+               "${_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")
+               if (COTIRE_DEBUG)
+                       message (STATUS "clearing VS_UNICODE_OUTPUT")
+               endif()
+               # 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 "Error ${_result} precompiling ${_prefixFile}.")
+       endif()
+endfunction()
+
+function (cotire_check_precompiled_header_support _language _targetSourceDir _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_${_language}_COMPILER_ID MATCHES "GNU")
+               # GCC PCH support requires version >= 3.4
+               cotire_determine_compiler_version("${_language}" COTIRE_${_language}_COMPILER)
+               if ("${COTIRE_${_language}_COMPILER_VERSION}" MATCHES ".+" AND
+                       "${COTIRE_${_language}_COMPILER_VERSION}" VERSION_LESS "3.4.0")
+                       set (${_msgVar} "${_unsupportedCompiler} version ${COTIRE_${_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
+               cotire_determine_compiler_version("${_language}" COTIRE_${_language}_COMPILER)
+               if ("${COTIRE_${_language}_COMPILER_VERSION}" MATCHES ".+" AND
+                       "${COTIRE_${_language}_COMPILER_VERSION}" VERSION_LESS "8.0.0")
+                       set (${_msgVar} "${_unsupportedCompiler} version ${COTIRE_${_language}_COMPILER_VERSION}." PARENT_SCOPE)
+               else()
+                       set (${_msgVar} "" PARENT_SCOPE)
+               endif()
+       else()
+               set (${_msgVar} "${_unsupportedCompiler}." PARENT_SCOPE)
+       endif()
+       if (APPLE)
+               # PCH compilation not supported by GCC / Clang for multi-architecture builds (e.g., i386, x86_64)
+               if (CMAKE_CONFIGURATION_TYPES)
+                       set (_configs ${CMAKE_CONFIGURATION_TYPES})
+               elseif (CMAKE_BUILD_TYPE)
+                       set (_configs ${CMAKE_BUILD_TYPE})
+               else()
+                       set (_configs "None")
+               endif()
+               foreach (_config ${_configs})
+                       set (_targetFlags "")
+                       cotire_get_target_compile_flags("${_config}" "${_language}" "${_targetSourceDir}" "${_target}" _targetFlags)
+                       cotire_filter_compile_flags("${_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)
+       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")
+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)
+       if (COTIRE_DEBUG)
+               message(STATUS "${_unityFile}")
+       endif()
+endfunction()
+
+function (cotire_make_unity_source_file_paths _language _target _maxIncludes _unityFilesVar)
+       cotire_setup_file_extension_variables()
+       if (NOT DEFINED _unityFileExt_${_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} ${_unityFiles} PARENT_SCOPE)
+       if (COTIRE_DEBUG)
+               message(STATUS "${_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} "${_prefixFile}" PARENT_SCOPE)
+endfunction()
+
+function (cotire_make_prefix_file_name _language _target _prefixFileBaseNameVar _prefixFileNameVar)
+       cotire_setup_file_extension_variables()
+       if (NOT _language)
+               set (_prefixFileBaseName "${_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)
+endfunction()
+
+function (cotire_make_prefix_file_path _language _target _prefixFileVar)
+       cotire_make_prefix_file_name("${_language}" "${_target}" _prefixFileBaseName _prefixFileName)
+       set (${_prefixFileVar} "" PARENT_SCOPE)
+       if (_prefixFileName)
+               if (NOT _language)
+                       set (_language "C")
+               endif()
+               if (MSVC OR CMAKE_${_language}_COMPILER_ID MATCHES "GNU|Clang|Intel")
+                       cotire_get_intermediate_dir(_baseDir)
+                       set (${_prefixFileVar} "${_baseDir}/${_prefixFileName}" PARENT_SCOPE)
+               endif()
+       endif()
+endfunction()
+
+function (cotire_make_pch_file_path _language _targetSourceDir _target _pchFileVar)
+       cotire_make_prefix_file_name("${_language}" "${_target}" _prefixFileBaseName _prefixFileName)
+       set (${_pchFileVar} "" PARENT_SCOPE)
+       if (_prefixFileBaseName AND _prefixFileName)
+               cotire_check_precompiled_header_support("${_language}" "${_targetSourceDir}" "${_target}" _msg)
+               if (NOT _msg)
+                       if (XCODE)
+                               # For Xcode, we completely hand off the compilation of the prefix header to the IDE
+                               return()
+                       endif()
+                       cotire_get_intermediate_dir(_baseDir)
+                       if (CMAKE_${_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 "GNU|Clang")
+                               # GCC / Clang look 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)
+endfunction()
+
+function (cotire_get_unity_source_dependencies _language _target _dependencySourcesVar)
+       set (_dependencySources "")
+       # depend on target's generated source files
+       cotire_get_objects_with_property_on(_generatedSources GENERATED SOURCE ${ARGN})
+       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 depends on ${_dependencySources}")
+       endif()
+       set (${_dependencySourcesVar} ${_dependencySources} PARENT_SCOPE)
+endfunction()
+
+function (cotire_get_prefix_header_dependencies _language _target _dependencySourcesVar)
+       # depend on target source files marked with custom COTIRE_DEPENDENCY property
+       set (_dependencySources "")
+       cotire_get_objects_with_property_on(_dependencySources COTIRE_DEPENDENCY SOURCE ${ARGN})
+       if (COTIRE_DEBUG AND _dependencySources)
+               message (STATUS "${_language} ${_target} prefix header DEPENDS ${_dependencySources}")
+       endif()
+       set (${_dependencySourcesVar} ${_dependencySources} PARENT_SCOPE)
+endfunction()
+
+function (cotire_generate_target_script _language _configurations _targetSourceDir _targetBinaryDir _target _targetScriptVar)
+       set (COTIRE_TARGET_SOURCES ${ARGN})
+       get_filename_component(_moduleName "${COTIRE_CMAKE_MODULE_FILE}" NAME)
+       set (_targetCotireScript "${CMAKE_CURRENT_BINARY_DIR}/${_target}_${_language}_${_moduleName}")
+       cotire_get_prefix_header_dependencies(${_language} ${_target} COTIRE_TARGET_PREFIX_DEPENDS ${COTIRE_TARGET_SOURCES})
+       cotire_get_unity_source_dependencies(${_language} ${_target} COTIRE_TARGET_UNITY_DEPENDS ${COTIRE_TARGET_SOURCES})
+       # set up variables to be configured
+       set (COTIRE_TARGET_LANGUAGE "${_language}")
+       cotire_determine_compiler_version("${COTIRE_TARGET_LANGUAGE}" COTIRE_${_language}_COMPILER)
+       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)
+       cotire_get_source_files_undefs(COTIRE_UNITY_SOURCE_PRE_UNDEFS COTIRE_TARGET_SOURCES_PRE_UNDEFS ${COTIRE_TARGET_SOURCES})
+       cotire_get_source_files_undefs(COTIRE_UNITY_SOURCE_POST_UNDEFS COTIRE_TARGET_SOURCES_POST_UNDEFS ${COTIRE_TARGET_SOURCES})
+       set (COTIRE_TARGET_CONFIGURATION_TYPES "${_configurations}")
+       foreach (_config ${_configurations})
+               string (TOUPPER "${_config}" _upperConfig)
+               cotire_get_target_include_directories(
+                       "${_config}" "${_language}" "${_targetSourceDir}" "${_targetBinaryDir}" "${_target}" COTIRE_TARGET_INCLUDE_DIRECTORIES_${_upperConfig})
+               cotire_get_target_compile_definitions(
+                       "${_config}" "${_language}" "${_targetSourceDir}" "${_target}" COTIRE_TARGET_COMPILE_DEFINITIONS_${_upperConfig})
+               cotire_get_target_compiler_flags(
+                       "${_config}" "${_language}" "${_targetSourceDir}" "${_target}" COTIRE_TARGET_COMPILE_FLAGS_${_upperConfig})
+               cotire_get_source_files_compile_definitions(
+                       "${_config}" "${_language}" COTIRE_TARGET_SOURCES_COMPILE_DEFINITIONS_${_upperConfig} ${COTIRE_TARGET_SOURCES})
+       endforeach()
+       get_cmake_property(_vars VARIABLES)
+       string (REGEX MATCHALL "COTIRE_[A-Za-z0-9_]+" _matchVars "${_vars}")
+       # remove COTIRE_VERBOSE which is passed as a CMake define on command line
+       list (REMOVE_ITEM _matchVars COTIRE_VERBOSE)
+       set (_contents "")
+       foreach (_var IN LISTS _matchVars ITEMS
+               MSVC CMAKE_GENERATOR CMAKE_BUILD_TYPE CMAKE_CONFIGURATION_TYPES
+               CMAKE_${_language}_COMPILER_ID CMAKE_${_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")
+               endif()
+       endforeach()
+       cotire_write_file("CMAKE" "${_targetCotireScript}" "${_contents}" FALSE)
+       set (${_targetScriptVar} "${_targetCotireScript}" PARENT_SCOPE)
+endfunction()
+
+function (cotire_setup_pch_file_compilation _language _targetBinaryDir _targetScript _prefixFile _pchFile)
+       set (_sourceFiles ${ARGN})
+       if (CMAKE_${_language}_COMPILER_ID MATCHES "MSVC|Intel")
+               # for Visual Studio and Intel, we attach the precompiled header compilation to the first source file
+               # the remaining files include the precompiled header, see cotire_setup_prefix_file_inclusion
+               if (_sourceFiles)
+                       file (TO_NATIVE_PATH "${_prefixFile}" _prefixFileNative)
+                       file (TO_NATIVE_PATH "${_pchFile}" _pchFileNative)
+                       list (GET _sourceFiles 0 _hostFile)
+                       set (_flags "")
+                       cotire_determine_compiler_version("${_language}" COTIRE_${_language}_COMPILER)
+                       cotire_add_pch_compilation_flags(
+                               "${_language}" "${CMAKE_${_language}_COMPILER_ID}" "${COTIRE_${_language}_COMPILER_VERSION}"
+                               "${_prefixFile}" "${_pchFile}" "${_hostFile}" _flags)
+                       set_property (SOURCE ${_hostFile} APPEND_STRING PROPERTY COMPILE_FLAGS " ${_flags} ")
+                       set_property (SOURCE ${_hostFile} APPEND PROPERTY OBJECT_OUTPUTS "${_pchFile}")
+                       # make first source file depend on prefix header
+                       set_property (SOURCE ${_hostFile} APPEND PROPERTY OBJECT_DEPENDS "${_prefixFile}")
+               endif()
+       elseif ("${CMAKE_GENERATOR}" MATCHES "Makefiles|Ninja")
+               # for makefile based generator, we add a custom command to precompile the prefix header
+               if (_targetScript)
+                       cotire_set_cmd_to_prologue(_cmds)
+                       list (GET _sourceFiles 0 _hostFile)
+                       list (APPEND _cmds -P "${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 "${_targetSourceDir}"
+                               COMMENT "Building ${_language} precompiled header ${_pchFileRelPath}" VERBATIM)
+               endif()
+       endif()
+endfunction()
+
+function (cotire_setup_prefix_file_inclusion _language _target _wholeTarget _prefixFile _pchFile)
+       set (_sourceFiles ${ARGN})
+       if (CMAKE_${_language}_COMPILER_ID MATCHES "MSVC|Intel")
+               # for Visual Studio and Intel, we include the precompiled header in all but the first source file
+               # the first source file does the precompiled header compilation, see cotire_setup_pch_file_compilation
+               list (LENGTH _sourceFiles _numberOfSourceFiles)
+               if (_numberOfSourceFiles GREATER 1)
+                       # mark sources as cotired to prevent them from being used in another cotired target
+                       set_source_files_properties(${_sourceFiles} PROPERTIES COTIRE_TARGET "${_target}")
+                       list (REMOVE_AT _sourceFiles 0)
+                       set (_flags "")
+                       cotire_determine_compiler_version("${_language}" COTIRE_${_language}_COMPILER)
+                       cotire_add_pch_inclusion_flags(
+                               "${_language}" "${CMAKE_${_language}_COMPILER_ID}" "${COTIRE_${_language}_COMPILER_VERSION}"
+                               "${_prefixFile}" "${_pchFile}" _flags)
+                       set_property (SOURCE ${_sourceFiles} APPEND_STRING PROPERTY COMPILE_FLAGS " ${_flags} ")
+                       # make source files depend on precompiled header
+                       set_property (SOURCE ${_sourceFiles} APPEND PROPERTY OBJECT_DEPENDS "${_pchFile}")
+               endif()
+       elseif ("${CMAKE_GENERATOR}" MATCHES "Makefiles|Ninja")
+               if (NOT _wholeTarget)
+                       # for makefile based generator, we force the inclusion of the prefix header for a subset
+                       # of the source files, if this is a multi-language target or has excluded files
+                       set (_flags "")
+                       cotire_determine_compiler_version("${_language}" COTIRE_${_language}_COMPILER)
+                       cotire_add_pch_inclusion_flags(
+                               "${_language}" "${CMAKE_${_language}_COMPILER_ID}" "${COTIRE_${_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 source files depend on precompiled header
+               set_property (SOURCE ${_sourceFiles} APPEND PROPERTY OBJECT_DEPENDS "${_pchFile}")
+       endif()
+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)
+endfunction()
+
+function (cotire_setup_combine_command _language _sourceDir _targetScript _joinedFile _cmdsVar)
+       set (_files ${ARGN})
+       set (_filesPaths "")
+       foreach (_file ${_files})
+               if (IS_ABSOLUTE "${_file}")
+                       set (_filePath "${_file}")
+               else()
+                       get_filename_component(_filePath "${_sourceDir}/${_file}" ABSOLUTE)
+               endif()
+               file (RELATIVE_PATH _fileRelPath "${_sourceDir}" "${_filePath}")
+               if (NOT IS_ABSOLUTE "${_fileRelPath}" AND NOT "${_fileRelPath}" MATCHES "^\\.\\.")
+                       list (APPEND _filesPaths "${_fileRelPath}")
+               else()
+                       list (APPEND _filesPaths "${_filePath}")
+               endif()
+       endforeach()
+       cotire_set_cmd_to_prologue(_prefixCmd)
+       list (APPEND _prefixCmd -P "${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(_joinedFileName "${_joinedFileRelPath}" NAME_WE)
+       if (_language AND _joinedFileName MATCHES "${COTIRE_UNITY_SOURCE_FILENAME_SUFFIX}$")
+               set (_comment "Generating ${_language} unity source ${_joinedFileRelPath}")
+       elseif (_language AND _joinedFileName MATCHES "${COTIRE_UNITY_SOURCE_FILENAME_SUFFIX}$")
+               set (_comment "Generating ${_language} prefix header ${_joinedFileRelPath}")
+       else()
+               set (_comment "Generating ${_joinedFileRelPath}")
+       endif()
+       add_custom_command(
+               OUTPUT "${_joinedFile}"
+               COMMAND ${_prefixCmd}
+               DEPENDS ${_files}
+               COMMENT "${_comment}"
+               WORKING_DIRECTORY "${_sourceDir}" VERBATIM)
+       list (APPEND ${_cmdsVar} COMMAND ${_prefixCmd})
+       set (${_cmdsVar} ${${_cmdsVar}} PARENT_SCOPE)
+endfunction()
+
+function (cotire_setup_target_pch_usage _languages _targetSourceDir _target _wholeTarget)
+       if (XCODE)
+               # for Xcode, we attach a pre-build action to generate the unity sources and prefix headers
+               # if necessary, we also generate a single prefix header which includes all language specific 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)
+                       cotire_make_prefix_file_path("" ${_target} _prefixHeader)
+                       cotire_setup_combine_command("" "${_targetSourceDir}" "" "${_prefixHeader}" _cmds ${_prefixFiles})
+               else()
+                       set (_prefixHeader "${_prefixFiles}")
+               endif()
+               if (COTIRE_DEBUG)
+                       message (STATUS "add_custom_command: TARGET ${_target} PRE_BUILD ${_cmds}")
+               endif()
+               add_custom_command(TARGET "${_target}"
+                       PRE_BUILD ${_cmds}
+                       WORKING_DIRECTORY "${_targetSourceDir}"
+                       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 ("${CMAKE_GENERATOR}" MATCHES "Makefiles|Ninja")
+               # for makefile based generator, we force inclusion of the prefix header for all target source files
+               # if this is a single-language target without any excluded files
+               if (_wholeTarget)
+                       set (_language "${_languages}")
+                       # for Visual Studio and Intel, precompiled header inclusion is always done on the source file level
+                       # see cotire_setup_prefix_file_inclusion
+                       if (NOT CMAKE_${_language}_COMPILER_ID MATCHES "MSVC|Intel")
+                               get_property(_prefixFile TARGET ${_target} PROPERTY COTIRE_${_language}_PREFIX_HEADER)
+                               get_property(_pchFile TARGET ${_target} PROPERTY COTIRE_${_language}_PRECOMPILED_HEADER)
+                               set (_flags "")
+                               cotire_determine_compiler_version("${_language}" COTIRE_${_language}_COMPILER)
+                               cotire_add_pch_inclusion_flags(
+                                       "${_language}" "${CMAKE_${_language}_COMPILER_ID}" "${COTIRE_${_language}_COMPILER_VERSION}"
+                                       "${_prefixFile}" "${_pchFile}" _flags)
+                               set_property (TARGET ${_target} APPEND_STRING PROPERTY COMPILE_FLAGS " ${_flags} ")
+                       endif()
+               endif()
+       endif()
+endfunction()
+
+function (cotire_setup_unity_generation_commands _language _targetSourceDir _target _targetScript _unityFiles _cmdsVar)
+       set (_dependencySources "")
+       cotire_get_unity_source_dependencies(${_language} ${_target} _dependencySources ${ARGN})
+       foreach (_unityFile ${_unityFiles})
+               file (RELATIVE_PATH _unityFileRelPath "${CMAKE_BINARY_DIR}" "${_unityFile}")
+               set_property (SOURCE "${_unityFile}" PROPERTY GENERATED TRUE)
+               # set up compiled unity source dependencies
+               # this ensures that missing source files are generated before the unity file is compiled
+               if (COTIRE_DEBUG AND _dependencySources)
+                       message (STATUS "${_unityFile} OBJECT_DEPENDS ${_dependencySources}")
+               endif()
+               if (_dependencySources)
+                       set_property (SOURCE "${_unityFile}" PROPERTY OBJECT_DEPENDS ${_dependencySources})
+               endif()
+               if (WIN32 AND CMAKE_${_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" "${_targetScript}" "${_unityFile}")
+               if (COTIRE_DEBUG)
+                       message (STATUS "add_custom_command: OUTPUT ${_unityFile} COMMAND ${_unityCmd} DEPENDS ${_targetScript}")
+               endif()
+               add_custom_command(
+                       OUTPUT "${_unityFile}"
+                       COMMAND ${_unityCmd}
+                       DEPENDS "${_targetScript}"
+                       COMMENT "Generating ${_language} unity source ${_unityFileRelPath}"
+                       WORKING_DIRECTORY "${_targetSourceDir}" 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} "${_targetSourceDir}" "${_targetScript}" "${_unityFile}" ${_cmdsVar} ${_unityFiles})
+       endif()
+       set (${_cmdsVar} ${${_cmdsVar}} PARENT_SCOPE)
+endfunction()
+
+function (cotire_setup_single_prefix_generation_command _language _target _targetSourceDir _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 ${_targetScript} ${_unityFile} ${_dependencySources}")
+       endif()
+       file (RELATIVE_PATH _prefixFileRelPath "${CMAKE_BINARY_DIR}" "${_prefixFile}")
+       add_custom_command(
+               OUTPUT "${_prefixFile}" "${_prefixFile}.log"
+               COMMAND ${_prefixCmd}
+               DEPENDS "${_targetScript}" "${_unityFile}" ${_dependencySources}
+               COMMENT "Generating ${_language} prefix header ${_prefixFileRelPath}"
+               WORKING_DIRECTORY "${CMAKE_BINARY_DIR}" VERBATIM)
+       list (APPEND ${_cmdsVar} COMMAND ${_prefixCmd})
+       set (${_cmdsVar} ${${_cmdsVar}} PARENT_SCOPE)
+endfunction()
+
+function (cotire_setup_multi_prefix_generation_command _language _target _targetSourceDir _targetScript _prefixFile _unityFiles _cmdsVar)
+       set (_sourceFiles ${ARGN})
+       list (LENGTH _unityFiles _numberOfUnityFiles)
+       if (_numberOfUnityFiles GREATER 1)
+               cotire_make_single_unity_source_file_path(${_language} ${_target} _unityFile)
+               cotire_setup_single_prefix_generation_command(
+                       ${_language} ${_target} "${_targetSourceDir}" "${_targetScript}"
+                       "${_prefixFile}" "${_unityFile}" ${_cmdsVar} ${_sourceFiles})
+       else()
+               cotire_setup_single_prefix_generation_command(
+                       ${_language} ${_target} "${_targetSourceDir}" "${_targetScript}"
+                       "${_prefixFile}" "${_unityFiles}" ${_cmdsVar} ${_sourceFiles})
+       endif()
+       set (${_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_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_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}")
+       string (REPLACE ";" ", " _excludedStr "${ARGN}")
+       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} ${_disableMsg}")
+               endif()
+       elseif (NOT _targetUsePCH)
+               if (_allExcludedSourceFiles)
+                       set (_targetMsg "${_languagesStr} target ${_target} cotired excluding files ${_excludedStr} without precompiled header.")
+               else()
+                       set (_targetMsg "${_languagesStr} target ${_target} cotired without precompiled header.")
+               endif()
+               if (_disableMsg)
+                       set (_targetMsg "${_targetMsg} ${_disableMsg}")
+               endif()
+       elseif (NOT _targetAddSCU)
+               if (_allExcludedSourceFiles)
+                       set (_targetMsg "${_languagesStr} target ${_target} cotired excluding files ${_excludedStr} without unity build.")
+               else()
+                       set (_targetMsg "${_languagesStr} target ${_target} cotired without unity build.")
+               endif()
+       else()
+               if (_allExcludedSourceFiles)
+                       set (_targetMsg "${_languagesStr} target ${_target} cotired excluding files ${_excludedStr}.")
+               else()
+                       set (_targetMsg "${_languagesStr} target ${_target} cotired.")
+               endif()
+       endif()
+       set (${_targetMsgVar} "${_targetMsg}" PARENT_SCOPE)
+endfunction()
+
+function (cotire_choose_target_languages _targetSourceDir _target _targetLanguagesVar)
+       set (_languages ${ARGN})
+       set (_allSourceFiles "")
+       set (_allExcludedSourceFiles "")
+       set (_allCotiredSourceFiles "")
+       set (_targetLanguages "")
+       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 (WARNING "Target ${_target} has already been cotired.")
+                       set (${_targetLanguagesVar} "" PARENT_SCOPE)
+                       return()
+               endif()
+               if (_targetUsePCH AND "${_language}" STREQUAL "C" OR "${_language}" STREQUAL "CXX")
+                       cotire_check_precompiled_header_support("${_language}" "${_targetSourceDir}" "${_target}" _disableMsg)
+                       if (_disableMsg)
+                               set (_targetUsePCH FALSE)
+                       endif()
+               endif()
+               set (_sourceFiles "")
+               set (_excludedSources "")
+               set (_cotiredSources "")
+               cotire_filter_language_source_files(${_language} _sourceFiles _excludedSources _cotiredSources ${_targetSourceFiles})
+               if (_sourceFiles OR _excludedSources OR _cotiredSources)
+                       list (APPEND _targetLanguages ${_language})
+               endif()
+               if (_sourceFiles)
+                       list (APPEND _allSourceFiles ${_sourceFiles})
+               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)
+               list (LENGTH _allSourceFiles _numberOfSources)
+               if (_numberOfSources LESS ${COTIRE_MINIMUM_NUMBER_OF_TARGET_SOURCES})
+                       set (_disableMsg "Too few applicable sources.")
+                       set (_targetUsePCH FALSE)
+               elseif (_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} ${_cotireTargetsStr} to get a workable build system.")
+                       set (_targetMsgLevel SEND_ERROR)
+                       set (_targetUsePCH FALSE)
+               elseif (XCODE AND _allExcludedSourceFiles)
+                       # for Xcode, we cannot apply the precompiled header to individual sources, only to the whole target
+                       set (_disableMsg "Exclusion of source files not supported for generator Xcode.")
+                       set (_targetUsePCH FALSE)
+               elseif (XCODE AND "${_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()
+       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}")
+               # a unity source segment must not contain less than COTIRE_MINIMUM_NUMBER_OF_TARGET_SOURCES files
+               if (_maxIncludes LESS ${COTIRE_MINIMUM_NUMBER_OF_TARGET_SOURCES})
+                       set (_maxIncludes ${COTIRE_MINIMUM_NUMBER_OF_TARGET_SOURCES})
+               endif()
+       elseif (NOT _maxIncludes MATCHES "[0-9]+")
+               set (_maxIncludes 0)
+       endif()
+       if (COTIRE_DEBUG)
+               message (STATUS "${_target} unity source max includes = ${_maxIncludes}")
+       endif()
+       set (${_maxIncludesVar} ${_maxIncludes} PARENT_SCOPE)
+endfunction()
+
+function (cotire_process_target_language _language _configurations _targetSourceDir _targetBinaryDir _target _wholeTargetVar _cmdsVar)
+       set (${_cmdsVar} "" PARENT_SCOPE)
+       get_target_property(_targetSourceFiles ${_target} SOURCES)
+       set (_sourceFiles "")
+       set (_excludedSources "")
+       set (_cotiredSources "")
+       cotire_filter_language_source_files(${_language} _sourceFiles _excludedSources _cotiredSources ${_targetSourceFiles})
+       if (NOT _sourceFiles AND NOT _cotiredSources)
+               return()
+       endif()
+       set (_wholeTarget ${${_wholeTargetVar}})
+       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}" "${_targetSourceDir}" "${_targetBinaryDir}" ${_target} _targetScript ${_unitySourceFiles})
+       cotire_compute_unity_max_number_of_includes(${_target} _maxIncludes ${_unitySourceFiles})
+       cotire_make_unity_source_file_paths(${_language} ${_target} ${_maxIncludes} _unityFiles ${_unitySourceFiles})
+       if (NOT _unityFiles)
+               return()
+       endif()
+       cotire_setup_unity_generation_commands(
+               ${_language} "${_targetSourceDir}" ${_target} "${_targetScript}" "${_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_combine_command(${_language} "${_targetSourceDir}" "${_targetScript}" "${_prefixFile}" _cmds ${_prefixHeaderFiles})
+               else()
+                       cotire_setup_multi_prefix_generation_command(
+                               ${_language} ${_target} "${_targetSourceDir}" "${_targetScript}" "${_prefixFile}" "${_unityFiles}" _cmds ${_unitySourceFiles})
+               endif()
+               get_target_property(_targetUsePCH ${_target} COTIRE_ENABLE_PRECOMPILED_HEADER)
+               if (_targetUsePCH)
+                       cotire_make_pch_file_path(${_language} "${_targetSourceDir}" ${_target} _pchFile)
+                       if (_pchFile)
+                               cotire_setup_pch_file_compilation(
+                                       ${_language} "${_targetBinaryDir}" "${_targetScript}" "${_prefixFile}" "${_pchFile}" ${_sourceFiles})
+                               if (_excludedSources)
+                                       set (_wholeTarget FALSE)
+                               endif()
+                               cotire_setup_prefix_file_inclusion(
+                                       ${_language} ${_target} ${_wholeTarget} "${_prefixFile}" "${_pchFile}" ${_sourceFiles})
+                       endif()
+               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 "${_pchFile}")
+               endif()
+       endif()
+       set (${_wholeTargetVar} ${_wholeTarget} PARENT_SCOPE)
+       set (${_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()
+endfunction()
+
+function (cotire_setup_pch_target _languages _configurations _target)
+       if ("${CMAKE_GENERATOR}" MATCHES "Makefiles|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_setup_unity_build_target _languages _configurations _targetSourceDir _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")
+               get_target_property(_isWin32 ${_target} WIN32_EXECUTABLE)
+               get_target_property(_isMacOSX_Bundle ${_target} MACOSX_BUNDLE)
+               if (_isWin32)
+                       set (_unityTargetSubType WIN32)
+               elseif (_isMacOSX_Bundle)
+                       set (_unityTargetSubType MACOSX_BUNDLE)
+               else()
+                       set (_unityTargetSubType "")
+               endif()
+       elseif (_targetType MATCHES "(STATIC|SHARED|MODULE|OBJECT)_LIBRARY")
+               set (_unityTargetSubType "${CMAKE_MATCH_1}")
+       else()
+               message (WARNING "Unknown target type ${_targetType}.")
+               return()
+       endif()
+       # determine unity target sources
+       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} _sourceFiles _excludedSources _cotiredSources ${_targetSourceFiles})
+                       if (_sourceFiles OR _cotiredSources)
+                               list (REMOVE_ITEM _unityTargetSources ${_sourceFiles} ${_cotiredSources})
+                       endif()
+                       # if cotire is applied to a target which has not been added in the current source dir,
+                       # non-existing files cannot be referenced from the unity build target (this is a CMake restriction)
+                       if (NOT "${_targetSourceDir}" STREQUAL "${CMAKE_CURRENT_SOURCE_DIR}")
+                               set (_nonExistingFiles "")
+                               foreach (_file ${_unityTargetSources})
+                                       if (NOT EXISTS "${_file}")
+                                               list (APPEND _nonExistingFiles "${_file}")
+                                       endif()
+                               endforeach()
+                               if (_nonExistingFiles)
+                                       if (COTIRE_VERBOSE)
+                                               message (STATUS "removing non-existing ${_nonExistingFiles} from ${_unityTargetName}")
+                                       endif()
+                                       list (REMOVE_ITEM _unityTargetSources ${_nonExistingFiles})
+                               endif()
+                       endif()
+                       # add unity source files instead
+                       list (APPEND _unityTargetSources ${_unityFiles})
+               endif()
+       endforeach()
+       if (COTIRE_DEBUG)
+               message (STATUS "add ${_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 ${_unityTargetSources})
+       endif()
+       set (_outputDirProperties
+               ARCHIVE_OUTPUT_DIRECTORY ARCHIVE_OUTPUT_DIRECTORY_<CONFIG>
+               LIBRARY_OUTPUT_DIRECTORY LIBRARY_OUTPUT_DIRECTORY_<CONFIG>
+               RUNTIME_OUTPUT_DIRECTORY RUNTIME_OUTPUT_DIRECTORY_<CONFIG>)
+       # copy output location properties
+       if (COTIRE_UNITY_OUTPUT_DIRECTORY)
+               set (_setDefaultOutputDir TRUE)
+               if (IS_ABSOLUTE "${COTIRE_UNITY_OUTPUT_DIRECTORY}")
+                       set (_outputDir "${COTIRE_UNITY_OUTPUT_DIRECTORY}")
+               else()
+                       cotrie_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName} ${_outputDirProperties})
+                       cotrie_resolve_config_properites("${_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()
+               cotrie_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName} ${_outputDirProperties})
+       endif()
+       # copy output name
+       cotrie_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName}
+               ARCHIVE_OUTPUT_NAME ARCHIVE_OUTPUT_NAME_<CONFIG>
+               LIBRARY_OUTPUT_NAME LIBRARY_OUTPUT_NAME_<CONFIG>
+               OUTPUT_NAME OUTPUT_NAME_<CONFIG>
+               RUNTIME_OUTPUT_NAME RUNTIME_OUTPUT_NAME_<CONFIG>
+               PREFIX <CONFIG>_POSTFIX SUFFIX)
+       # copy compile stuff
+       cotrie_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName}
+               COMPILE_DEFINITIONS COMPILE_DEFINITIONS_<CONFIG>
+               COMPILE_FLAGS Fortran_FORMAT
+               INCLUDE_DIRECTORIES
+               INTERPROCEDURAL_OPTIMIZATION INTERPROCEDURAL_OPTIMIZATION_<CONFIG>
+               POSITION_INDEPENDENT_CODE)
+       # copy link stuff
+       cotrie_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName}
+               BUILD_WITH_INSTALL_RPATH INSTALL_RPATH INSTALL_RPATH_USE_LINK_PATH SKIP_BUILD_RPATH
+               LINKER_LANGUAGE LINK_DEPENDS
+               LINK_FLAGS LINK_FLAGS_<CONFIG>
+               LINK_INTERFACE_LIBRARIES LINK_INTERFACE_LIBRARIES_<CONFIG>
+               LINK_INTERFACE_MULTIPLICITY LINK_INTERFACE_MULTIPLICITY_<CONFIG>
+               LINK_SEARCH_START_STATIC LINK_SEARCH_END_STATIC
+               STATIC_LIBRARY_FLAGS STATIC_LIBRARY_FLAGS_<CONFIG>
+               NO_SONAME SOVERSION VERSION)
+       # copy Qt stuff
+       cotrie_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName}
+               AUTOMOC AUTOMOC_MOC_OPTIONS)
+       # copy cmake stuff
+       cotrie_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName}
+               IMPLICIT_DEPENDS_INCLUDE_TRANSFORM RULE_LAUNCH_COMPILE RULE_LAUNCH_CUSTOM RULE_LAUNCH_LINK)
+       # copy platform stuff
+       if (APPLE)
+               cotrie_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName}
+                       BUNDLE BUNDLE_EXTENSION FRAMEWORK INSTALL_NAME_DIR MACOSX_BUNDLE_INFO_PLIST MACOSX_FRAMEWORK_INFO_PLIST
+                       OSX_ARCHITECTURES OSX_ARCHITECTURES_<CONFIG> PRIVATE_HEADER PUBLIC_HEADER RESOURCE)
+       elseif (WIN32)
+               cotrie_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName}
+                       GNUtoMS
+                       PDB_NAME PDB_NAME_<CONFIG> PDB_OUTPUT_DIRECTORY PDB_OUTPUT_DIRECTORY_<CONFIG>
+                       VS_DOTNET_REFERENCES VS_GLOBAL_KEYWORD VS_GLOBAL_PROJECT_TYPES VS_KEYWORD
+                       VS_SCC_AUXPATH VS_SCC_LOCALPATH VS_SCC_PROJECTNAME VS_SCC_PROVIDER
+                       VS_WINRT_EXTENSIONS VS_WINRT_REFERENCES)
+       endif()
+       # 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 SOURCE_DIR BINARY_DIR)
+       set(_multiValueArgs LANGUAGES CONFIGURATIONS)
+       cmake_parse_arguments(_option "${_options}" "${_oneValueArgs}" "${_multiValueArgs}" ${ARGN})
+       if (NOT _option_SOURCE_DIR)
+               set (_option_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}")
+       endif()
+       if (NOT _option_BINARY_DIR)
+               set (_option_BINARY_DIR "${CMAKE_CURRENT_BINARY_DIR}")
+       endif()
+       if (NOT _option_LANGUAGES)
+               get_property (_option_LANGUAGES GLOBAL PROPERTY ENABLED_LANGUAGES)
+       endif()
+       if (NOT _option_CONFIGURATIONS)
+               if (CMAKE_CONFIGURATION_TYPES)
+                       set (_option_CONFIGURATIONS ${CMAKE_CONFIGURATION_TYPES})
+               elseif (CMAKE_BUILD_TYPE)
+                       set (_option_CONFIGURATIONS "${CMAKE_BUILD_TYPE}")
+               else()
+                       set (_option_CONFIGURATIONS "None")
+               endif()
+       endif()
+       # trivial checks
+       get_target_property(_imported ${_target} IMPORTED)
+       if (_imported)
+               message (WARNING "Imported target ${_target} cannot be cotired.")
+               return()
+       endif()
+       # check if target needs to be cotired for build type
+       # when using configuration types, the test is performed at build time
+       cotire_init_cotire_target_properties(${_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 (${_option_CONFIGURATIONS})")
+                       endif()
+                       return()
+               endif()
+       endif()
+       # choose languages that apply to the target
+       cotire_choose_target_languages("${_option_SOURCE_DIR}" "${_target}" _targetLanguages ${_option_LANGUAGES})
+       if (NOT _targetLanguages)
+               return()
+       endif()
+       list (LENGTH _targetLanguages _numberOfLanguages)
+       if (_numberOfLanguages GREATER 1)
+               set (_wholeTarget FALSE)
+       else()
+               set (_wholeTarget TRUE)
+       endif()
+       set (_cmds "")
+       foreach (_language ${_targetLanguages})
+               cotire_process_target_language("${_language}" "${_option_CONFIGURATIONS}"
+                       "${_option_SOURCE_DIR}" "${_option_BINARY_DIR}" ${_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}" "${_option_CONFIGURATIONS}" "${_option_SOURCE_DIR}" ${_target})
+       endif()
+       get_target_property(_targetUsePCH ${_target} COTIRE_ENABLE_PRECOMPILED_HEADER)
+       if (_targetUsePCH)
+               cotire_setup_target_pch_usage("${_targetLanguages}" "${_option_SOURCE_DIR}" ${_target} ${_wholeTarget} ${_cmds})
+               cotire_setup_pch_target("${_targetLanguages}" "${_option_CONFIGURATIONS}" ${_target})
+       endif()
+       get_target_property(_targetAddCleanTarget ${_target} COTIRE_ADD_CLEAN)
+       if (_targetAddCleanTarget)
+               cotire_setup_clean_target(${_target})
+       endif()
+endfunction()
+
+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 "removing ${_filesToRemove}")
+               endif()
+               file (REMOVE ${_filesToRemove})
+       endif()
+endfunction()
+
+function (cotire_init_target _targetName)
+       if (COTIRE_TARGETS_FOLDER)
+               set_target_properties(${_targetName} PROPERTIES FOLDER "${COTIRE_TARGETS_FOLDER}")
+       endif()
+       if (MSVC_IDE)
+               set_target_properties(${_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} ${_pchTargetName})
+endfunction()
+
+function (cotire_add_to_unity_all_target _unityTargetName)
+       set (_targetName "${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} ${_unityTargetName})
+endfunction()
+
+function (cotire_setup_clean_all_target)
+       set (_targetName "${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("${_targetName}")
+       endif()
+endfunction()
+
+function (cotire)
+       set(_options "")
+       set(_oneValueArgs SOURCE_DIR BINARY_DIR)
+       set(_multiValueArgs LANGUAGES CONFIGURATIONS)
+       cmake_parse_arguments(_option "${_options}" "${_oneValueArgs}" "${_multiValueArgs}" ${ARGN})
+       set (_targets ${_option_UNPARSED_ARGUMENTS})
+       if (NOT _option_SOURCE_DIR)
+               set (_option_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}")
+       endif()
+       if (NOT _option_BINARY_DIR)
+               set (_option_BINARY_DIR "${CMAKE_CURRENT_BINARY_DIR}")
+       endif()
+       foreach (_target ${_targets})
+               if (TARGET ${_target})
+                       cotire_target(${_target} LANGUAGES ${_option_LANGUAGES} CONFIGURATIONS ${_option_CONFIGURATIONS}
+                               SOURCE_DIR "${_option_SOURCE_DIR}" BINARY_DIR "${_option_BINARY_DIR}")
+               else()
+                       message (WARNING "${_target} is not a 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} ${COTIRE_ARGV5}")
+       endif()
+
+       if (WIN32)
+               # for MSVC, compiler IDs may not always be set correctly
+               if (MSVC)
+                       set (CMAKE_C_COMPILER_ID "MSVC")
+                       set (CMAKE_CXX_COMPILER_ID "MSVC")
+               endif()
+       endif()
+
+       if (NOT COTIRE_BUILD_TYPE)
+               set (COTIRE_BUILD_TYPE "None")
+       endif()
+       string (TOUPPER "${COTIRE_BUILD_TYPE}" _upperConfig)
+       set (_includeDirs ${COTIRE_TARGET_INCLUDE_DIRECTORIES_${_upperConfig}})
+       set (_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")
+
+               cotire_select_unity_source_files("${COTIRE_ARGV3}" _sources ${_sources})
+               cotire_generate_unity_source(
+                       "${COTIRE_ARGV3}" ${_sources}
+                       LANGUAGE "${COTIRE_TARGET_LANGUAGE}"
+                       DEPENDS "${COTIRE_ARGV0}" "${COTIRE_ARGV2}"
+                       SOURCES_COMPILE_DEFINITIONS ${_sourcesDefinitions}
+                       PRE_UNDEFS ${_targetPreUndefs}
+                       POST_UNDEFS ${_targetPostUndefs}
+                       SOURCES_PRE_UNDEFS ${_sourcesPreUndefs}
+                       SOURCES_POST_UNDEFS ${_sourcesPostUndefs})
+
+       elseif ("${COTIRE_ARGV1}" STREQUAL "prefix")
+
+               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 "${COTIRE_${COTIRE_TARGET_LANGUAGE}_COMPILER_VERSION}"
+                       LANGUAGE "${COTIRE_TARGET_LANGUAGE}"
+                       DEPENDS "${COTIRE_ARGV0}" "${COTIRE_ARGV4}" ${COTIRE_TARGET_PREFIX_DEPENDS}
+                       IGNORE_PATH "${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_DIRECTORIES ${_includeDirs}
+                       COMPILE_DEFINITIONS ${_compileDefinitions}
+                       COMPILE_FLAGS ${_compileFlags})
+
+       elseif ("${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 "${COTIRE_${COTIRE_TARGET_LANGUAGE}_COMPILER_VERSION}"
+                       LANGUAGE "${COTIRE_TARGET_LANGUAGE}"
+                       INCLUDE_DIRECTORIES ${_includeDirs}
+                       COMPILE_DEFINITIONS ${_compileDefinitions}
+                       COMPILE_FLAGS ${_compileFlags})
+
+       elseif ("${COTIRE_ARGV1}" STREQUAL "combine")
+
+               if (COTIRE_TARGET_LANGUAGE)
+                       set (_startIndex 3)
+               else()
+                       set (_startIndex 2)
+               endif()
+               set (_files "")
+               foreach (_index RANGE ${_startIndex} ${COTIRE_ARGC})
+                       if (COTIRE_ARGV${_index})
+                               list (APPEND _files "${COTIRE_ARGV${_index}}")
+                       endif()
+               endforeach()
+               if (COTIRE_TARGET_LANGUAGE)
+                       cotire_generate_unity_source(${_files} LANGUAGE "${COTIRE_TARGET_LANGUAGE}")
+               else()
+                       cotire_generate_unity_source(${_files})
+               endif()
+
+       elseif ("${COTIRE_ARGV1}" STREQUAL "cleanup")
+
+               cotire_cleanup("${COTIRE_ARGV2}" "${COTIRE_ARGV3}" "${COTIRE_ARGV4}")
+
+       else()
+               message (FATAL_ERROR "Unknown cotire command \"${COTIRE_ARGV1}\".")
+       endif()
+
+else()
+
+       # cotire is being run in include mode
+       # set up all variable and property definitions
+
+       unset (COTIRE_C_COMPILER_VERSION CACHE)
+       unset (COTIRE_CXX_COMPILER_VERSION CACHE)
+
+       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 "${COTIRE_MAXIMUM_NUMBER_OF_UNITY_INCLUDES_INIT}" CACHE STRING
+               "Maximum number of source files to include in a single unity source file.")
+
+       if (NOT COTIRE_PREFIX_HEADER_FILENAME_SUFFIX)
+               set (COTIRE_PREFIX_HEADER_FILENAME_SUFFIX "_prefix")
+       endif()
+       if (NOT COTIRE_UNITY_SOURCE_FILENAME_SUFFIX)
+               set (COTIRE_UNITY_SOURCE_FILENAME_SUFFIX "_unity")
+       endif()
+       if (NOT COTIRE_INTDIR)
+               set (COTIRE_INTDIR "cotire")
+       endif()
+       if (NOT COTIRE_PCH_ALL_TARGET_NAME)
+               set (COTIRE_PCH_ALL_TARGET_NAME "all_pch")
+       endif()
+       if (NOT COTIRE_UNITY_BUILD_ALL_TARGET_NAME)
+               set (COTIRE_UNITY_BUILD_ALL_TARGET_NAME "all_unity")
+       endif()
+       if (NOT COTIRE_CLEAN_ALL_TARGET_NAME)
+               set (COTIRE_CLEAN_ALL_TARGET_NAME "clean_cotire")
+       endif()
+       if (NOT COTIRE_CLEAN_TARGET_SUFFIX)
+               set (COTIRE_CLEAN_TARGET_SUFFIX "_clean_cotire")
+       endif()
+       if (NOT COTIRE_PCH_TARGET_SUFFIX)
+               set (COTIRE_PCH_TARGET_SUFFIX "_pch")
+       endif()
+       if (NOT COTIRE_UNITY_BUILD_TARGET_SUFFIX)
+               set (COTIRE_UNITY_BUILD_TARGET_SUFFIX "_unity")
+       endif()
+       if (NOT DEFINED COTIRE_TARGETS_FOLDER)
+               set (COTIRE_TARGETS_FOLDER "cotire")
+       endif()
+       if (NOT DEFINED COTIRE_UNITY_OUTPUT_DIRECTORY)
+               if ("${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_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 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_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_<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()
index 5f32467b2a855b4a6682d1215214e9803b5e1046..dacb972306eb90bc993bc7b318f1abe025b270e4 100644 (file)
 ##
 
 cmake_minimum_required(VERSION 2.6)
+
 include(FindPkgConfig)
 include(GNUInstallDirs)
 
+set (CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/CMake")
+include(cotire)
+
 project(pulseview)
 
 #===============================================================================
@@ -236,6 +240,7 @@ add_executable(${PROJECT_NAME}
 )
 
 target_link_libraries(${PROJECT_NAME} ${PULSEVIEW_LINK_LIBS})
+cotire(${PROJECT_NAME})
 
 if(WIN32)
 # Pass -mwindows so that no "DOS box" will open when PulseView is started.