2 files changed, 4385 insertions, 0 deletions

diff --git a/cmake/FindSFML.cmake b/cmake/FindSFML.cmake
new file mode 100644
index 0000000..ba1217d
--- /dev/null
+++ b/cmake/FindSFML.cmake
@@ -0,0 +1,368 @@
+# This script locates the SFML library
+# ------------------------------------
+#
+# Usage
+# -----
+#
+# When you try to locate the SFML libraries, you must specify which modules you want to use (system, window, graphics, network, audio, main).
+# If none is given, the SFML_LIBRARIES variable will be empty and you'll end up linking to nothing.
+# example:
+#   find_package(SFML COMPONENTS graphics window system) // find the graphics, window and system modules
+#
+# You can enforce a specific version, either MAJOR.MINOR or only MAJOR.
+# If nothing is specified, the version won't be checked (i.e. any version will be accepted).
+# example:
+#   find_package(SFML COMPONENTS ...)     // no specific version required
+#   find_package(SFML 2 COMPONENTS ...)   // any 2.x version
+#   find_package(SFML 2.4 COMPONENTS ...) // version 2.4 or greater
+#
+# By default, the dynamic libraries of SFML will be found. To find the static ones instead,
+# you must set the SFML_STATIC_LIBRARIES variable to TRUE before calling find_package(SFML ...).
+# Since you have to link yourself all the SFML dependencies when you link it statically, the following
+# additional variables are defined: SFML_XXX_DEPENDENCIES and SFML_DEPENDENCIES (see their detailed
+# description below).
+# In case of static linking, the SFML_STATIC macro will also be defined by this script.
+# example:
+#   set(SFML_STATIC_LIBRARIES TRUE)
+#   find_package(SFML 2 COMPONENTS network system)
+#
+# On Mac OS X if SFML_STATIC_LIBRARIES is not set to TRUE then by default CMake will search for frameworks unless
+# CMAKE_FIND_FRAMEWORK is set to "NEVER" for example. Please refer to CMake documentation for more details.
+# Moreover, keep in mind that SFML frameworks are only available as release libraries unlike dylibs which
+# are available for both release and debug modes.
+#
+# If SFML is not installed in a standard path, you can use the SFML_ROOT CMake (or environment) variable
+# to tell CMake where SFML is.
+#
+# Output
+# ------
+#
+# This script defines the following variables:
+# - For each specified module XXX (system, window, graphics, network, audio, main):
+#   - SFML_XXX_LIBRARY_DEBUG:   the name of the debug library of the xxx module (set to SFML_XXX_LIBRARY_RELEASE is no debug version is found)
+#   - SFML_XXX_LIBRARY_RELEASE: the name of the release library of the xxx module (set to SFML_XXX_LIBRARY_DEBUG is no release version is found)
+#   - SFML_XXX_LIBRARY:         the name of the library to link to for the xxx module (includes both debug and optimized names if necessary)
+#   - SFML_XXX_FOUND:           true if either the debug or release library of the xxx module is found
+#   - SFML_XXX_DEPENDENCIES:    the list of libraries the module depends on, in case of static linking
+# - SFML_LIBRARIES:    the list of all libraries corresponding to the required modules
+# - SFML_FOUND:        true if all the required modules are found
+# - SFML_INCLUDE_DIR:  the path where SFML headers are located (the directory containing the SFML/Config.hpp file)
+# - SFML_DEPENDENCIES: the list of libraries SFML depends on, in case of static linking
+#
+# example:
+#   find_package(SFML 2 COMPONENTS system window graphics audio REQUIRED)
+#   include_directories(${SFML_INCLUDE_DIR})
+#   add_executable(myapp ...)
+#   target_link_libraries(myapp ${SFML_LIBRARIES})
+
+# define the SFML_STATIC macro if static build was chosen
+if (SFML_STATIC_LIBRARIES)
+    add_definitions(-DSFML_STATIC)
+endif ()
+
+# define the list of search paths for headers and libraries
+set(FIND_SFML_PATHS
+        ${SFML_ROOT}
+        $ENV{SFML_ROOT}
+        ~/Library/Frameworks
+        /Library/Frameworks
+        /usr/local
+        /usr
+        /sw
+        /opt/local
+        /opt/csw
+        /opt)
+
+# find the SFML include directory
+find_path(SFML_INCLUDE_DIR SFML/Config.hpp
+        PATH_SUFFIXES include
+        PATHS ${FIND_SFML_PATHS})
+
+# check the version number
+set(SFML_VERSION_OK TRUE)
+if (SFML_FIND_VERSION AND SFML_INCLUDE_DIR)
+    # extract the major and minor version numbers from SFML/Config.hpp
+    # we have to handle gtest a little bit differently:
+    if ("${SFML_INCLUDE_DIR}" MATCHES "SFML.framework")
+        set(SFML_CONFIG_HPP_INPUT "${SFML_INCLUDE_DIR}/Headers/Config.hpp")
+    else ()
+        set(SFML_CONFIG_HPP_INPUT "${SFML_INCLUDE_DIR}/SFML/Config.hpp")
+    endif ()
+    FILE(READ "${SFML_CONFIG_HPP_INPUT}" SFML_CONFIG_HPP_CONTENTS)
+    STRING(REGEX REPLACE ".*#define SFML_VERSION_MAJOR ([0-9]+).*" "\\1" SFML_VERSION_MAJOR "${SFML_CONFIG_HPP_CONTENTS}")
+    STRING(REGEX REPLACE ".*#define SFML_VERSION_MINOR ([0-9]+).*" "\\1" SFML_VERSION_MINOR "${SFML_CONFIG_HPP_CONTENTS}")
+    STRING(REGEX REPLACE ".*#define SFML_VERSION_PATCH ([0-9]+).*" "\\1" SFML_VERSION_PATCH "${SFML_CONFIG_HPP_CONTENTS}")
+    if (NOT "${SFML_VERSION_PATCH}" MATCHES "^[0-9]+$")
+        set(SFML_VERSION_PATCH 0)
+    endif ()
+    math(EXPR SFML_REQUESTED_VERSION "${SFML_FIND_VERSION_MAJOR} * 10000 + ${SFML_FIND_VERSION_MINOR} * 100 + ${SFML_FIND_VERSION_PATCH}")
+
+    # if we could extract them, compare with the requested version number
+    if (SFML_VERSION_MAJOR)
+        # transform version numbers to an integer
+        math(EXPR SFML_VERSION "${SFML_VERSION_MAJOR} * 10000 + ${SFML_VERSION_MINOR} * 100 + ${SFML_VERSION_PATCH}")
+
+        # compare them
+        if (SFML_VERSION LESS SFML_REQUESTED_VERSION)
+            set(SFML_VERSION_OK FALSE)
+        endif ()
+    else ()
+        # SFML version is < 2.0
+        if (SFML_REQUESTED_VERSION GREATER 10900)
+            set(SFML_VERSION_OK FALSE)
+            set(SFML_VERSION_MAJOR 1)
+            set(SFML_VERSION_MINOR x)
+            set(SFML_VERSION_PATCH x)
+        endif ()
+    endif ()
+endif ()
+
+# find the requested modules
+set(SFML_FOUND TRUE) # will be set to false if one of the required modules is not found
+foreach (FIND_SFML_COMPONENT ${SFML_FIND_COMPONENTS})
+    string(TOLOWER ${FIND_SFML_COMPONENT} FIND_SFML_COMPONENT_LOWER)
+    string(TOUPPER ${FIND_SFML_COMPONENT} FIND_SFML_COMPONENT_UPPER)
+    set(FIND_SFML_COMPONENT_NAME sfml-${FIND_SFML_COMPONENT_LOWER})
+
+    # no suffix for sfml-main, it is always a static library
+    if (FIND_SFML_COMPONENT_LOWER STREQUAL "main")
+        # release library
+        find_library(SFML_${FIND_SFML_COMPONENT_UPPER}_LIBRARY_RELEASE
+                NAMES ${FIND_SFML_COMPONENT_NAME}
+                PATH_SUFFIXES lib64 lib
+                PATHS ${FIND_SFML_PATHS})
+
+        # debug library
+        find_library(SFML_${FIND_SFML_COMPONENT_UPPER}_LIBRARY_DEBUG
+                NAMES ${FIND_SFML_COMPONENT_NAME}-d
+                PATH_SUFFIXES lib64 lib
+                PATHS ${FIND_SFML_PATHS})
+    else ()
+        # static release library
+        find_library(SFML_${FIND_SFML_COMPONENT_UPPER}_LIBRARY_STATIC_RELEASE
+                NAMES ${FIND_SFML_COMPONENT_NAME}-s
+                PATH_SUFFIXES lib64 lib
+                PATHS ${FIND_SFML_PATHS})
+
+        # static debug library
+        find_library(SFML_${FIND_SFML_COMPONENT_UPPER}_LIBRARY_STATIC_DEBUG
+                NAMES ${FIND_SFML_COMPONENT_NAME}-s-d
+                PATH_SUFFIXES lib64 lib
+                PATHS ${FIND_SFML_PATHS})
+
+        # dynamic release library
+        find_library(SFML_${FIND_SFML_COMPONENT_UPPER}_LIBRARY_DYNAMIC_RELEASE
+                NAMES ${FIND_SFML_COMPONENT_NAME}
+                PATH_SUFFIXES lib64 lib
+                PATHS ${FIND_SFML_PATHS})
+
+        # dynamic debug library
+        find_library(SFML_${FIND_SFML_COMPONENT_UPPER}_LIBRARY_DYNAMIC_DEBUG
+                NAMES ${FIND_SFML_COMPONENT_NAME}-d
+                PATH_SUFFIXES lib64 lib
+                PATHS ${FIND_SFML_PATHS})
+
+        # choose the entries that fit the requested link m_type
+        if (SFML_STATIC_LIBRARIES)
+            if (SFML_${FIND_SFML_COMPONENT_UPPER}_LIBRARY_STATIC_RELEASE)
+                set(SFML_${FIND_SFML_COMPONENT_UPPER}_LIBRARY_RELEASE ${SFML_${FIND_SFML_COMPONENT_UPPER}_LIBRARY_STATIC_RELEASE})
+            endif ()
+            if (SFML_${FIND_SFML_COMPONENT_UPPER}_LIBRARY_STATIC_DEBUG)
+                set(SFML_${FIND_SFML_COMPONENT_UPPER}_LIBRARY_DEBUG ${SFML_${FIND_SFML_COMPONENT_UPPER}_LIBRARY_STATIC_DEBUG})
+            endif ()
+        else ()
+            if (SFML_${FIND_SFML_COMPONENT_UPPER}_LIBRARY_DYNAMIC_RELEASE)
+                set(SFML_${FIND_SFML_COMPONENT_UPPER}_LIBRARY_RELEASE ${SFML_${FIND_SFML_COMPONENT_UPPER}_LIBRARY_DYNAMIC_RELEASE})
+            endif ()
+            if (SFML_${FIND_SFML_COMPONENT_UPPER}_LIBRARY_DYNAMIC_DEBUG)
+                set(SFML_${FIND_SFML_COMPONENT_UPPER}_LIBRARY_DEBUG ${SFML_${FIND_SFML_COMPONENT_UPPER}_LIBRARY_DYNAMIC_DEBUG})
+            endif ()
+        endif ()
+    endif ()
+
+    if (SFML_${FIND_SFML_COMPONENT_UPPER}_LIBRARY_DEBUG OR SFML_${FIND_SFML_COMPONENT_UPPER}_LIBRARY_RELEASE)
+        # library found
+        set(SFML_${FIND_SFML_COMPONENT_UPPER}_FOUND TRUE)
+
+        # if both are found, set SFML_XXX_LIBRARY to contain both
+        if (SFML_${FIND_SFML_COMPONENT_UPPER}_LIBRARY_DEBUG AND SFML_${FIND_SFML_COMPONENT_UPPER}_LIBRARY_RELEASE)
+            set(SFML_${FIND_SFML_COMPONENT_UPPER}_LIBRARY debug ${SFML_${FIND_SFML_COMPONENT_UPPER}_LIBRARY_DEBUG}
+                    optimized ${SFML_${FIND_SFML_COMPONENT_UPPER}_LIBRARY_RELEASE})
+        endif ()
+
+        # if only one debug/release variant is found, set the other to be equal to the found one
+        if (SFML_${FIND_SFML_COMPONENT_UPPER}_LIBRARY_DEBUG AND NOT SFML_${FIND_SFML_COMPONENT_UPPER}_LIBRARY_RELEASE)
+            # debug and not release
+            set(SFML_${FIND_SFML_COMPONENT_UPPER}_LIBRARY_RELEASE ${SFML_${FIND_SFML_COMPONENT_UPPER}_LIBRARY_DEBUG})
+            set(SFML_${FIND_SFML_COMPONENT_UPPER}_LIBRARY ${SFML_${FIND_SFML_COMPONENT_UPPER}_LIBRARY_DEBUG})
+        endif ()
+        if (SFML_${FIND_SFML_COMPONENT_UPPER}_LIBRARY_RELEASE AND NOT SFML_${FIND_SFML_COMPONENT_UPPER}_LIBRARY_DEBUG)
+            # release and not debug
+            set(SFML_${FIND_SFML_COMPONENT_UPPER}_LIBRARY_DEBUG ${SFML_${FIND_SFML_COMPONENT_UPPER}_LIBRARY_RELEASE})
+            set(SFML_${FIND_SFML_COMPONENT_UPPER}_LIBRARY ${SFML_${FIND_SFML_COMPONENT_UPPER}_LIBRARY_RELEASE})
+        endif ()
+    else ()
+        # library not found
+        set(SFML_FOUND FALSE)
+        set(SFML_${FIND_SFML_COMPONENT_UPPER}_FOUND FALSE)
+        set(SFML_${FIND_SFML_COMPONENT_UPPER}_LIBRARY "")
+        set(FIND_SFML_MISSING "${FIND_SFML_MISSING} SFML_${FIND_SFML_COMPONENT_UPPER}_LIBRARY")
+    endif ()
+
+    # mark as advanced
+    MARK_AS_ADVANCED(SFML_${FIND_SFML_COMPONENT_UPPER}_LIBRARY
+            SFML_${FIND_SFML_COMPONENT_UPPER}_LIBRARY_RELEASE
+            SFML_${FIND_SFML_COMPONENT_UPPER}_LIBRARY_DEBUG
+            SFML_${FIND_SFML_COMPONENT_UPPER}_LIBRARY_STATIC_RELEASE
+            SFML_${FIND_SFML_COMPONENT_UPPER}_LIBRARY_STATIC_DEBUG
+            SFML_${FIND_SFML_COMPONENT_UPPER}_LIBRARY_DYNAMIC_RELEASE
+            SFML_${FIND_SFML_COMPONENT_UPPER}_LIBRARY_DYNAMIC_DEBUG)
+
+    # add to the global list of libraries
+    set(SFML_LIBRARIES ${SFML_LIBRARIES} "${SFML_${FIND_SFML_COMPONENT_UPPER}_LIBRARY}")
+endforeach ()
+
+# in case of static linking, we must also define the list of all the dependencies of SFML libraries
+if (SFML_STATIC_LIBRARIES)
+
+    # detect the OS
+    if (${CMAKE_SYSTEM_NAME} MATCHES "Windows")
+        set(FIND_SFML_OS_WINDOWS 1)
+    elseif (${CMAKE_SYSTEM_NAME} MATCHES "Linux")
+        set(FIND_SFML_OS_LINUX 1)
+    elseif (${CMAKE_SYSTEM_NAME} MATCHES "FreeBSD")
+        set(FIND_SFML_OS_FREEBSD 1)
+    elseif (${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
+        set(FIND_SFML_OS_MACOSX 1)
+    endif ()
+
+    # start with an empty list
+    set(SFML_DEPENDENCIES)
+    set(FIND_SFML_DEPENDENCIES_NOTFOUND)
+
+    # macro that searches for a 3rd-party library
+    macro(find_sfml_dependency output friendlyname)
+        # No lookup in environment variables (PATH on Windows), as they may contain wrong library versions
+        find_library(${output} NAMES ${ARGN} PATHS ${FIND_SFML_PATHS} PATH_SUFFIXES lib NO_SYSTEM_ENVIRONMENT_PATH)
+        if (${${output}} STREQUAL "${output}-NOTFOUND")
+            unset(output)
+            set(FIND_SFML_DEPENDENCIES_NOTFOUND "${FIND_SFML_DEPENDENCIES_NOTFOUND} ${friendlyname}")
+        endif ()
+    endmacro()
+
+    # sfml-system
+    list(FIND SFML_FIND_COMPONENTS "system" FIND_SFML_SYSTEM_COMPONENT)
+    if (NOT ${FIND_SFML_SYSTEM_COMPONENT} EQUAL -1)
+
+        # Update the list -- these are only system libraries, no need to find them
+        if (FIND_SFML_OS_LINUX OR FIND_SFML_OS_FREEBSD OR FIND_SFML_OS_MACOSX)
+            set(SFML_SYSTEM_DEPENDENCIES "pthread")
+        endif ()
+        if (FIND_SFML_OS_LINUX)
+            set(SFML_SYSTEM_DEPENDENCIES ${SFML_SYSTEM_DEPENDENCIES} "rt")
+        endif ()
+        if (FIND_SFML_OS_WINDOWS)
+            set(SFML_SYSTEM_DEPENDENCIES "winmm")
+        endif ()
+        set(SFML_DEPENDENCIES ${SFML_SYSTEM_DEPENDENCIES} ${SFML_DEPENDENCIES})
+    endif ()
+
+    # sfml-network
+    list(FIND SFML_FIND_COMPONENTS "network" FIND_SFML_NETWORK_COMPONENT)
+    if (NOT ${FIND_SFML_NETWORK_COMPONENT} EQUAL -1)
+
+        # Update the list -- these are only system libraries, no need to find them
+        if (FIND_SFML_OS_WINDOWS)
+            set(SFML_NETWORK_DEPENDENCIES "ws2_32")
+        endif ()
+        set(SFML_DEPENDENCIES ${SFML_NETWORK_DEPENDENCIES} ${SFML_DEPENDENCIES})
+    endif ()
+
+    # sfml-window
+    list(FIND SFML_FIND_COMPONENTS "window" FIND_SFML_WINDOW_COMPONENT)
+    if (NOT ${FIND_SFML_WINDOW_COMPONENT} EQUAL -1)
+
+        # find libraries
+        if (FIND_SFML_OS_LINUX OR FIND_SFML_OS_FREEBSD)
+            find_sfml_dependency(X11_LIBRARY "X11" X11)
+            find_sfml_dependency(LIBXCB_LIBRARIES "XCB" xcb libxcb)
+            find_sfml_dependency(X11_XCB_LIBRARY "X11-xcb" X11-xcb libX11-xcb)
+            find_sfml_dependency(XCB_RANDR_LIBRARY "xcb-randr" xcb-randr libxcb-randr)
+            find_sfml_dependency(XCB_IMAGE_LIBRARY "xcb-image" xcb-image libxcb-image)
+        endif ()
+
+        if (FIND_SFML_OS_LINUX)
+            find_sfml_dependency(UDEV_LIBRARIES "UDev" udev libudev)
+        endif ()
+
+        # Update the list
+        if (FIND_SFML_OS_WINDOWS)
+            set(SFML_WINDOW_DEPENDENCIES ${SFML_WINDOW_DEPENDENCIES} "opengl32" "winmm" "gdi32")
+        elseif (FIND_SFML_OS_LINUX)
+            set(SFML_WINDOW_DEPENDENCIES ${SFML_WINDOW_DEPENDENCIES} "GL" ${X11_LIBRARY} ${LIBXCB_LIBRARIES} ${X11_XCB_LIBRARY} ${XCB_RANDR_LIBRARY} ${XCB_IMAGE_LIBRARY} ${UDEV_LIBRARIES})
+        elseif (FIND_SFML_OS_FREEBSD)
+            set(SFML_WINDOW_DEPENDENCIES ${SFML_WINDOW_DEPENDENCIES} "GL" ${X11_LIBRARY} ${LIBXCB_LIBRARIES} ${X11_XCB_LIBRARY} ${XCB_RANDR_LIBRARY} ${XCB_IMAGE_LIBRARY} "usbhid")
+        elseif (FIND_SFML_OS_MACOSX)
+            set(SFML_WINDOW_DEPENDENCIES ${SFML_WINDOW_DEPENDENCIES} "-framework OpenGL -framework Foundation -framework AppKit -framework IOKit -framework Carbon")
+        endif ()
+        set(SFML_DEPENDENCIES ${SFML_WINDOW_DEPENDENCIES} ${SFML_DEPENDENCIES})
+    endif ()
+
+    # sfml-graphics
+    list(FIND SFML_FIND_COMPONENTS "graphics" FIND_SFML_GRAPHICS_COMPONENT)
+    if (NOT ${FIND_SFML_GRAPHICS_COMPONENT} EQUAL -1)
+
+        # find libraries
+        find_sfml_dependency(FREETYPE_LIBRARY "FreeType" freetype)
+        find_sfml_dependency(JPEG_LIBRARY "libjpeg" jpeg)
+
+        # Update the list
+        set(SFML_GRAPHICS_DEPENDENCIES ${FREETYPE_LIBRARY} ${JPEG_LIBRARY})
+        set(SFML_DEPENDENCIES ${SFML_GRAPHICS_DEPENDENCIES} ${SFML_DEPENDENCIES})
+    endif ()
+
+    # sfml-audio
+    list(FIND SFML_FIND_COMPONENTS "audio" FIND_SFML_AUDIO_COMPONENT)
+    if (NOT ${FIND_SFML_AUDIO_COMPONENT} EQUAL -1)
+
+        # find libraries
+        find_sfml_dependency(OPENAL_LIBRARY "OpenAL" openal openal32)
+        find_sfml_dependency(OGG_LIBRARY "Ogg" ogg)
+        find_sfml_dependency(VORBIS_LIBRARY "Vorbis" vorbis)
+        find_sfml_dependency(VORBISFILE_LIBRARY "VorbisFile" vorbisfile)
+        find_sfml_dependency(VORBISENC_LIBRARY "VorbisEnc" vorbisenc)
+        find_sfml_dependency(FLAC_LIBRARY "FLAC" FLAC)
+
+        # Update the list
+        set(SFML_AUDIO_DEPENDENCIES ${OPENAL_LIBRARY} ${FLAC_LIBRARY} ${VORBISENC_LIBRARY} ${VORBISFILE_LIBRARY} ${VORBIS_LIBRARY} ${OGG_LIBRARY})
+        set(SFML_DEPENDENCIES ${SFML_DEPENDENCIES} ${SFML_AUDIO_DEPENDENCIES})
+    endif ()
+
+endif ()
+
+# handle errors
+if (NOT SFML_VERSION_OK)
+    # SFML version not ok
+    set(FIND_SFML_ERROR "SFML found but version too low (requested: ${SFML_FIND_VERSION}, found: ${SFML_VERSION_MAJOR}.${SFML_VERSION_MINOR}.${SFML_VERSION_PATCH})")
+    set(SFML_FOUND FALSE)
+elseif (SFML_STATIC_LIBRARIES AND FIND_SFML_DEPENDENCIES_NOTFOUND)
+    set(FIND_SFML_ERROR "SFML found but some of its dependencies are missing (${FIND_SFML_DEPENDENCIES_NOTFOUND})")
+    set(SFML_FOUND FALSE)
+elseif (NOT SFML_FOUND)
+    # include directory or library not found
+    set(FIND_SFML_ERROR "Could NOT find SFML (missing: ${FIND_SFML_MISSING})")
+endif ()
+if (NOT SFML_FOUND)
+    if (SFML_FIND_REQUIRED)
+        # fatal error
+        message(FATAL_ERROR ${FIND_SFML_ERROR})
+    elseif (NOT SFML_FIND_QUIETLY)
+        # error but continue
+        message("${FIND_SFML_ERROR}")
+    endif ()
+endif ()
+
+# handle success
+if (SFML_FOUND AND NOT SFML_FIND_QUIETLY)
+    message(STATUS "Found SFML ${SFML_VERSION_MAJOR}.${SFML_VERSION_MINOR}.${SFML_VERSION_PATCH} in ${SFML_INCLUDE_DIR}")
+endif ()
diff --git a/cmake/cotire.cmake b/cmake/cotire.cmake
new file mode 100644
index 0000000..6cf0cb6
--- /dev/null
+++ b/cmake/cotire.cmake
@@ -0,0 +1,4017 @@
+# - cotire (compile time reducer)
+#
+# See the cotire manual for usage hints.
+#
+#=============================================================================
+# Copyright 2012-2016 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()
+cmake_minimum_required(VERSION 2.8.12)
+if (NOT CMAKE_SCRIPT_MODE_FILE)
+	cmake_policy(POP)
+endif()
+
+set (COTIRE_CMAKE_MODULE_FILE "${CMAKE_CURRENT_LIST_FILE}")
+set (COTIRE_CMAKE_MODULE_VERSION "1.7.9")
+
+# activate select policies
+if (POLICY CMP0025)
+	# Compiler id for Apple Clang is now AppleClang
+	cmake_policy(SET CMP0025 NEW)
+endif()
+
+if (POLICY CMP0026)
+	# disallow use of the LOCATION target property
+	cmake_policy(SET CMP0026 NEW)
+endif()
+
+if (POLICY CMP0038)
+	# targets may not link directly to themselves
+	cmake_policy(SET CMP0038 NEW)
+endif()
+
+if (POLICY CMP0039)
+	# utility targets may not have link dependencies
+	cmake_policy(SET CMP0039 NEW)
+endif()
+
+if (POLICY CMP0040)
+	# target in the TARGET signature of add_custom_command() must exist
+	cmake_policy(SET CMP0040 NEW)
+endif()
+
+if (POLICY CMP0045)
+	# error on non-existent target in get_target_property
+	cmake_policy(SET CMP0045 NEW)
+endif()
+
+if (POLICY CMP0046)
+	# error on non-existent dependency in add_dependencies
+	cmake_policy(SET CMP0046 NEW)
+endif()
+
+if (POLICY CMP0049)
+	# do not expand variables in target source entries
+	cmake_policy(SET CMP0049 NEW)
+endif()
+
+if (POLICY CMP0050)
+	# disallow add_custom_command SOURCE signatures
+	cmake_policy(SET CMP0050 NEW)
+endif()
+
+if (POLICY CMP0051)
+	# include TARGET_OBJECTS expressions in a target's SOURCES property
+	cmake_policy(SET CMP0051 NEW)
+endif()
+
+if (POLICY CMP0053)
+	# simplify variable reference and escape sequence evaluation
+	cmake_policy(SET CMP0053 NEW)
+endif()
+
+if (POLICY CMP0054)
+	# only interpret if() arguments as variables or keywords when unquoted
+	cmake_policy(SET CMP0054 NEW)
+endif()
+
+include(CMakeParseArguments)
+include(ProcessorCount)
+
+function (cotire_get_configuration_types _configsVar)
+	set (_configs "")
+	if (CMAKE_CONFIGURATION_TYPES)
+		list (APPEND _configs ${CMAKE_CONFIGURATION_TYPES})
+	endif()
+	if (CMAKE_BUILD_TYPE)
+		list (APPEND _configs "${CMAKE_BUILD_TYPE}")
+	endif()
+	if (_configs)
+		list (REMOVE_DUPLICATES _configs)
+		set (${_configsVar} ${_configs} PARENT_SCOPE)
+	else()
+		set (${_configsVar} "None" PARENT_SCOPE)
+	endif()
+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 _target _sourceFilesVar _excludedSourceFilesVar _cotiredSourceFilesVar)
+	if (CMAKE_${_language}_SOURCE_FILE_EXTENSIONS)
+		set (_languageExtensions "${CMAKE_${_language}_SOURCE_FILE_EXTENSIONS}")
+	else()
+		set (_languageExtensions "")
+	endif()
+	if (CMAKE_${_language}_IGNORE_EXTENSIONS)
+		set (_ignoreExtensions "${CMAKE_${_language}_IGNORE_EXTENSIONS}")
+	else()
+		set (_ignoreExtensions "")
+	endif()
+	if (COTIRE_UNITY_SOURCE_EXCLUDE_EXTENSIONS)
+		set (_excludeExtensions "${COTIRE_UNITY_SOURCE_EXCLUDE_EXTENSIONS}")
+	else()
+		set (_excludeExtensions "")
+	endif()
+	if (COTIRE_DEBUG AND _languageExtensions)
+		message (STATUS "${_language} source file extensions: ${_languageExtensions}")
+	endif()
+	if (COTIRE_DEBUG AND _ignoreExtensions)
+		message (STATUS "${_language} ignore extensions: ${_ignoreExtensions}")
+	endif()
+	if (COTIRE_DEBUG AND _excludeExtensions)
+		message (STATUS "${_language} exclude extensions: ${_excludeExtensions}")
+	endif()
+	if (CMAKE_VERSION VERSION_LESS "3.1.0")
+		set (_allSourceFiles ${ARGN})
+	else()
+		# as of CMake 3.1 target sources may contain generator expressions
+		# since we cannot obtain required property information about source files added
+		# through generator expressions at configure time, we filter them out
+		string (GENEX_STRIP "${ARGN}" _allSourceFiles)
+	endif()
+	set (_filteredSourceFiles "")
+	set (_excludedSourceFiles "")
+	foreach (_sourceFile ${_allSourceFiles})
+		get_source_file_property(_sourceIsHeaderOnly "${_sourceFile}" HEADER_FILE_ONLY)
+		get_source_file_property(_sourceIsExternal "${_sourceFile}" EXTERNAL_OBJECT)
+		get_source_file_property(_sourceIsSymbolic "${_sourceFile}" SYMBOLIC)
+		if (NOT _sourceIsHeaderOnly AND NOT _sourceIsExternal AND NOT _sourceIsSymbolic)
+			cotire_get_source_file_extension("${_sourceFile}" _sourceExt)
+			if (_sourceExt)
+				list (FIND _ignoreExtensions "${_sourceExt}" _ignoreIndex)
+				if (_ignoreIndex LESS 0)
+					list (FIND _excludeExtensions "${_sourceExt}" _excludeIndex)
+					if (_excludeIndex GREATER -1)
+						list (APPEND _excludedSourceFiles "${_sourceFile}")
+					else()
+						list (FIND _languageExtensions "${_sourceExt}" _sourceIndex)
+						if (_sourceIndex GREATER -1)
+							# consider source file unless it is excluded explicitly
+							get_source_file_property(_sourceIsExcluded "${_sourceFile}" COTIRE_EXCLUDED)
+							if (_sourceIsExcluded)
+								list (APPEND _excludedSourceFiles "${_sourceFile}")
+							else()
+								list (APPEND _filteredSourceFiles "${_sourceFile}")
+							endif()
+						else()
+							get_source_file_property(_sourceLanguage "${_sourceFile}" LANGUAGE)
+							if ("${_sourceLanguage}" STREQUAL "${_language}")
+								# add to excluded sources, if file is not ignored and has correct language without having the correct extension
+								list (APPEND _excludedSourceFiles "${_sourceFile}")
+							endif()
+						endif()
+					endif()
+				endif()
+			endif()
+		endif()
+	endforeach()
+	# separate filtered source files from already cotired ones
+	# the COTIRE_TARGET property of a source file may be set while a target is being processed by cotire
+	set (_sourceFiles "")
+	set (_cotiredSourceFiles "")
+	foreach (_sourceFile ${_filteredSourceFiles})
+		get_source_file_property(_sourceIsCotired "${_sourceFile}" COTIRE_TARGET)
+		if (_sourceIsCotired)
+			list (APPEND _cotiredSourceFiles "${_sourceFile}")
+		else()
+			get_source_file_property(_sourceCompileFlags "${_sourceFile}" COMPILE_FLAGS)
+			if (_sourceCompileFlags)
+				# add to excluded sources, if file has custom compile flags
+				list (APPEND _excludedSourceFiles "${_sourceFile}")
+			else()
+				list (APPEND _sourceFiles "${_sourceFile}")
+			endif()
+		endif()
+	endforeach()
+	if (COTIRE_DEBUG)
+		if (_sourceFiles)
+			message (STATUS "Filtered ${_target} ${_language} sources: ${_sourceFiles}")
+		endif()
+		if (_excludedSourceFiles)
+			message (STATUS "Excluded ${_target} ${_language} sources: ${_excludedSourceFiles}")
+		endif()
+		if (_cotiredSourceFiles)
+			message (STATUS "Cotired ${_target} ${_language} sources: ${_cotiredSourceFiles}")
+		endif()
+	endif()
+	set (${_sourceFilesVar} ${_sourceFiles} PARENT_SCOPE)
+	set (${_excludedSourceFilesVar} ${_excludedSourceFiles} PARENT_SCOPE)
+	set (${_cotiredSourceFilesVar} ${_cotiredSourceFiles} PARENT_SCOPE)
+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 (cotire_resolve_config_properites _configurations _propertiesVar)
+	set (_properties "")
+	foreach (_property ${ARGN})
+		if ("${_property}" MATCHES "<CONFIG>")
+			foreach (_config ${_configurations})
+				string (TOUPPER "${_config}" _upperConfig)
+				string (REPLACE "<CONFIG>" "${_upperConfig}" _configProperty "${_property}")
+				list (APPEND _properties ${_configProperty})
+			endforeach()
+		else()
+			list (APPEND _properties ${_property})
+		endif()
+	endforeach()
+	set (${_propertiesVar} ${_properties} PARENT_SCOPE)
+endfunction()
+
+function (cotire_copy_set_properites _configurations _type _source _target)
+	cotire_resolve_config_properites("${_configurations}" _properties ${ARGN})
+	foreach (_property ${_properties})
+		get_property(_isSet ${_type} ${_source} PROPERTY ${_property} SET)
+		if (_isSet)
+			get_property(_propertyValue ${_type} ${_source} PROPERTY ${_property})
+			set_property(${_type} ${_target} PROPERTY ${_property} "${_propertyValue}")
+		endif()
+	endforeach()
+endfunction()
+
+function (cotire_get_target_usage_requirements _target _targetRequirementsVar)
+	set (_targetRequirements "")
+	get_target_property(_librariesToProcess ${_target} LINK_LIBRARIES)
+	while (_librariesToProcess)
+		# remove from head
+		list (GET _librariesToProcess 0 _library)
+		list (REMOVE_AT _librariesToProcess 0)
+		if (TARGET ${_library})
+			list (FIND _targetRequirements ${_library} _index)
+			if (_index LESS 0)
+				list (APPEND _targetRequirements ${_library})
+				# BFS traversal of transitive libraries
+				get_target_property(_libraries ${_library} INTERFACE_LINK_LIBRARIES)
+				if (_libraries)
+					list (APPEND _librariesToProcess ${_libraries})
+					list (REMOVE_DUPLICATES _librariesToProcess)
+				endif()
+			endif()
+		endif()
+	endwhile()
+	set (${_targetRequirementsVar} ${_targetRequirements} PARENT_SCOPE)
+endfunction()
+
+function (cotire_filter_compile_flags _language _flagFilter _matchedOptionsVar _unmatchedOptionsVar)
+	if (WIN32 AND CMAKE_${_language}_COMPILER_ID MATCHES "MSVC|Intel")
+		set (_flagPrefix "[/-]")
+	else()
+		set (_flagPrefix "--?")
+	endif()
+	set (_optionFlag "")
+	set (_matchedOptions "")
+	set (_unmatchedOptions "")
+	foreach (_compileFlag ${ARGN})
+		if (_compileFlag)
+			if (_optionFlag AND NOT "${_compileFlag}" MATCHES "^${_flagPrefix}")
+				# option with separate argument
+				list (APPEND _matchedOptions "${_compileFlag}")
+				set (_optionFlag "")
+			elseif ("${_compileFlag}" MATCHES "^(${_flagPrefix})(${_flagFilter})$")
+				# remember option
+				set (_optionFlag "${CMAKE_MATCH_2}")
+			elseif ("${_compileFlag}" MATCHES "^(${_flagPrefix})(${_flagFilter})(.+)$")
+				# option with joined argument
+				list (APPEND _matchedOptions "${CMAKE_MATCH_3}")
+				set (_optionFlag "")
+			else()
+				# flush remembered option
+				if (_optionFlag)
+					list (APPEND _matchedOptions "${_optionFlag}")
+					set (_optionFlag "")
+				endif()
+				# add to unfiltered options
+				list (APPEND _unmatchedOptions "${_compileFlag}")
+			endif()
+		endif()
+	endforeach()
+	if (_optionFlag)
+		list (APPEND _matchedOptions "${_optionFlag}")
+	endif()
+	if (COTIRE_DEBUG AND _matchedOptions)
+		message (STATUS "Filter ${_flagFilter} matched: ${_matchedOptions}")
+	endif()
+	if (COTIRE_DEBUG AND _unmatchedOptions)
+		message (STATUS "Filter ${_flagFilter} unmatched: ${_unmatchedOptions}")
+	endif()
+	set (${_matchedOptionsVar} ${_matchedOptions} PARENT_SCOPE)
+	set (${_unmatchedOptionsVar} ${_unmatchedOptions} PARENT_SCOPE)
+endfunction()
+
+function (cotire_is_target_supported _target _isSupportedVar)
+	if (NOT TARGET "${_target}")
+		set (${_isSupportedVar} FALSE PARENT_SCOPE)
+		return()
+	endif()
+	get_target_property(_imported ${_target} IMPORTED)
+	if (_imported)
+		set (${_isSupportedVar} FALSE PARENT_SCOPE)
+		return()
+	endif()
+	get_target_property(_targetType ${_target} TYPE)
+	if (NOT _targetType MATCHES "EXECUTABLE|(STATIC|SHARED|MODULE|OBJECT)_LIBRARY")
+		set (${_isSupportedVar} FALSE PARENT_SCOPE)
+		return()
+	endif()
+	set (${_isSupportedVar} TRUE PARENT_SCOPE)
+endfunction()
+
+function (cotire_get_target_compile_flags _config _language _target _flagsVar)
+	string (TOUPPER "${_config}" _upperConfig)
+	# collect options from CMake language variables
+	set (_compileFlags "")
+	if (CMAKE_${_language}_FLAGS)
+		set (_compileFlags "${_compileFlags} ${CMAKE_${_language}_FLAGS}")
+	endif()
+	if (CMAKE_${_language}_FLAGS_${_upperConfig})
+		set (_compileFlags "${_compileFlags} ${CMAKE_${_language}_FLAGS_${_upperConfig}}")
+	endif()
+	if (_target)
+		# add target compile flags
+		get_target_property(_targetflags ${_target} COMPILE_FLAGS)
+		if (_targetflags)
+			set (_compileFlags "${_compileFlags} ${_targetflags}")
+		endif()
+	endif()
+	if (UNIX)
+		separate_arguments(_compileFlags UNIX_COMMAND "${_compileFlags}")
+	elseif(WIN32)
+		separate_arguments(_compileFlags WINDOWS_COMMAND "${_compileFlags}")
+	else()
+		separate_arguments(_compileFlags)
+	endif()
+	# target compile options
+	if (_target)
+		get_target_property(_targetOptions ${_target} COMPILE_OPTIONS)
+		if (_targetOptions)
+			list (APPEND _compileFlags ${_targetOptions})
+		endif()
+	endif()
+	# interface compile options from linked library targets
+	if (_target)
+		set (_linkedTargets "")
+		cotire_get_target_usage_requirements(${_target} _linkedTargets)
+		foreach (_linkedTarget ${_linkedTargets})
+			get_target_property(_targetOptions ${_linkedTarget} INTERFACE_COMPILE_OPTIONS)
+			if (_targetOptions)
+				list (APPEND _compileFlags ${_targetOptions})
+			endif()
+		endforeach()
+	endif()
+	# handle language standard properties
+	if (CMAKE_${_language}_STANDARD_DEFAULT)
+		# used compiler supports language standard levels
+		if (_target)
+			get_target_property(_targetLanguageStandard ${_target} ${_language}_STANDARD)
+			if (_targetLanguageStandard)
+				set (_type "EXTENSION")
+				get_property(_isSet TARGET ${_target} PROPERTY ${_language}_EXTENSIONS SET)
+				if (_isSet)
+					get_target_property(_targetUseLanguageExtensions ${_target} ${_language}_EXTENSIONS)
+					if (NOT _targetUseLanguageExtensions)
+						set (_type "STANDARD")
+					endif()
+				endif()
+				if (CMAKE_${_language}${_targetLanguageStandard}_${_type}_COMPILE_OPTION)
+					list (APPEND _compileFlags "${CMAKE_${_language}${_targetLanguageStandard}_${_type}_COMPILE_OPTION}")
+				endif()
+			endif()
+		endif()
+	endif()
+	# handle the POSITION_INDEPENDENT_CODE target property
+	if (_target)
+		get_target_property(_targetPIC ${_target} POSITION_INDEPENDENT_CODE)
+		if (_targetPIC)
+			get_target_property(_targetType ${_target} TYPE)
+			if (_targetType STREQUAL "EXECUTABLE" AND CMAKE_${_language}_COMPILE_OPTIONS_PIE)
+				list (APPEND _compileFlags "${CMAKE_${_language}_COMPILE_OPTIONS_PIE}")
+			elseif (CMAKE_${_language}_COMPILE_OPTIONS_PIC)
+				list (APPEND _compileFlags "${CMAKE_${_language}_COMPILE_OPTIONS_PIC}")
+			endif()
+		endif()
+	endif()
+	# handle visibility target properties
+	if (_target)
+		get_target_property(_targetVisibility ${_target} ${_language}_VISIBILITY_PRESET)
+		if (_targetVisibility AND CMAKE_${_language}_COMPILE_OPTIONS_VISIBILITY)
+			list (APPEND _compileFlags "${CMAKE_${_language}_COMPILE_OPTIONS_VISIBILITY}${_targetVisibility}")
+		endif()
+		get_target_property(_targetVisibilityInlines ${_target} VISIBILITY_INLINES_HIDDEN)
+		if (_targetVisibilityInlines AND CMAKE_${_language}_COMPILE_OPTIONS_VISIBILITY_INLINES_HIDDEN)
+			list (APPEND _compileFlags "${CMAKE_${_language}_COMPILE_OPTIONS_VISIBILITY_INLINES_HIDDEN}")
+		endif()
+	endif()
+	# platform specific flags
+	if (APPLE)
+		get_target_property(_architectures ${_target} OSX_ARCHITECTURES_${_upperConfig})
+		if (NOT _architectures)
+			get_target_property(_architectures ${_target} OSX_ARCHITECTURES)
+		endif()
+		if (_architectures)
+			foreach (_arch ${_architectures})
+				list (APPEND _compileFlags "-arch" "${_arch}")
+			endforeach()
+		endif()
+		if (CMAKE_OSX_SYSROOT)
+			if (CMAKE_${_language}_SYSROOT_FLAG)
+				list (APPEND _compileFlags "${CMAKE_${_language}_SYSROOT_FLAG}" "${CMAKE_OSX_SYSROOT}")
+			else()
+				list (APPEND _compileFlags "-isysroot" "${CMAKE_OSX_SYSROOT}")
+			endif()
+		endif()
+		if (CMAKE_OSX_DEPLOYMENT_TARGET)
+			if (CMAKE_${_language}_OSX_DEPLOYMENT_TARGET_FLAG)
+				list (APPEND _compileFlags "${CMAKE_${_language}_OSX_DEPLOYMENT_TARGET_FLAG}${CMAKE_OSX_DEPLOYMENT_TARGET}")
+			else()
+				list (APPEND _compileFlags "-mmacosx-version-min=${CMAKE_OSX_DEPLOYMENT_TARGET}")
+			endif()
+		endif()
+	endif()
+	if (COTIRE_DEBUG AND _compileFlags)
+		message (STATUS "Target ${_target} compile flags: ${_compileFlags}")
+	endif()
+	set (${_flagsVar} ${_compileFlags} PARENT_SCOPE)
+endfunction()
+
+function (cotire_get_target_include_directories _config _language _target _includeDirsVar _systemIncludeDirsVar)
+	set (_includeDirs "")
+	set (_systemIncludeDirs "")
+	# default include dirs
+	if (CMAKE_INCLUDE_CURRENT_DIR)
+		list (APPEND _includeDirs "${CMAKE_CURRENT_BINARY_DIR}")
+		list (APPEND _includeDirs "${CMAKE_CURRENT_SOURCE_DIR}")
+	endif()
+	set (_targetFlags "")
+	cotire_get_target_compile_flags("${_config}" "${_language}" "${_target}" _targetFlags)
+	# parse additional include directories from target compile flags
+	if (CMAKE_INCLUDE_FLAG_${_language})
+		string (STRIP "${CMAKE_INCLUDE_FLAG_${_language}}" _includeFlag)
+		string (REGEX REPLACE "^[-/]+" "" _includeFlag "${_includeFlag}")
+		if (_includeFlag)
+			set (_dirs "")
+			cotire_filter_compile_flags("${_language}" "${_includeFlag}" _dirs _ignore ${_targetFlags})
+			if (_dirs)
+				list (APPEND _includeDirs ${_dirs})
+			endif()
+		endif()
+	endif()
+	# parse additional system include directories from target compile flags
+	if (CMAKE_INCLUDE_SYSTEM_FLAG_${_language})
+		string (STRIP "${CMAKE_INCLUDE_SYSTEM_FLAG_${_language}}" _includeFlag)
+		string (REGEX REPLACE "^[-/]+" "" _includeFlag "${_includeFlag}")
+		if (_includeFlag)
+			set (_dirs "")
+			cotire_filter_compile_flags("${_language}" "${_includeFlag}" _dirs _ignore ${_targetFlags})
+			if (_dirs)
+				list (APPEND _systemIncludeDirs ${_dirs})
+			endif()
+		endif()
+	endif()
+	# target include directories
+	get_directory_property(_dirs DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}" INCLUDE_DIRECTORIES)
+	if (_target)
+		get_target_property(_targetDirs ${_target} INCLUDE_DIRECTORIES)
+		if (_targetDirs)
+			list (APPEND _dirs ${_targetDirs})
+		endif()
+		get_target_property(_targetDirs ${_target} INTERFACE_SYSTEM_INCLUDE_DIRECTORIES)
+		if (_targetDirs)
+			list (APPEND _systemIncludeDirs ${_targetDirs})
+		endif()
+	endif()
+	# interface include directories from linked library targets
+	if (_target)
+		set (_linkedTargets "")
+		cotire_get_target_usage_requirements(${_target} _linkedTargets)
+		foreach (_linkedTarget ${_linkedTargets})
+			get_target_property(_linkedTargetType ${_linkedTarget} TYPE)
+			if (CMAKE_INCLUDE_CURRENT_DIR_IN_INTERFACE AND NOT CMAKE_VERSION VERSION_LESS "3.4.0" AND
+				_linkedTargetType MATCHES "(STATIC|SHARED|MODULE|OBJECT)_LIBRARY")
+				# CMAKE_INCLUDE_CURRENT_DIR_IN_INTERFACE refers to CMAKE_CURRENT_BINARY_DIR and CMAKE_CURRENT_SOURCE_DIR
+				# at the time, when the target was created. These correspond to the target properties BINARY_DIR and SOURCE_DIR
+				# which are only available with CMake 3.4 or later.
+				get_target_property(_targetDirs ${_linkedTarget} BINARY_DIR)
+				if (_targetDirs)
+					list (APPEND _dirs ${_targetDirs})
+				endif()
+				get_target_property(_targetDirs ${_linkedTarget} SOURCE_DIR)
+				if (_targetDirs)
+					list (APPEND _dirs ${_targetDirs})
+				endif()
+			endif()
+			get_target_property(_targetDirs ${_linkedTarget} INTERFACE_INCLUDE_DIRECTORIES)
+			if (_targetDirs)
+				list (APPEND _dirs ${_targetDirs})
+			endif()
+			get_target_property(_targetDirs ${_linkedTarget} INTERFACE_SYSTEM_INCLUDE_DIRECTORIES)
+			if (_targetDirs)
+				list (APPEND _systemIncludeDirs ${_targetDirs})
+			endif()
+		endforeach()
+	endif()
+	if (dirs)
+		list (REMOVE_DUPLICATES _dirs)
+	endif()
+	list (LENGTH _includeDirs _projectInsertIndex)
+	foreach (_dir ${_dirs})
+		if (CMAKE_INCLUDE_DIRECTORIES_PROJECT_BEFORE)
+			cotire_check_is_path_relative_to("${_dir}" _isRelative "${CMAKE_SOURCE_DIR}" "${CMAKE_BINARY_DIR}")
+			if (_isRelative)
+				list (LENGTH _includeDirs _len)
+				if (_len EQUAL _projectInsertIndex)
+					list (APPEND _includeDirs "${_dir}")
+				else()
+					list (INSERT _includeDirs _projectInsertIndex "${_dir}")
+				endif()
+				math (EXPR _projectInsertIndex "${_projectInsertIndex} + 1")
+			else()
+				list (APPEND _includeDirs "${_dir}")
+			endif()
+		else()
+			list (APPEND _includeDirs "${_dir}")
+		endif()
+	endforeach()
+	list (REMOVE_DUPLICATES _includeDirs)
+	list (REMOVE_DUPLICATES _systemIncludeDirs)
+	if (CMAKE_${_language}_IMPLICIT_INCLUDE_DIRECTORIES)
+		list (REMOVE_ITEM _includeDirs ${CMAKE_${_language}_IMPLICIT_INCLUDE_DIRECTORIES})
+	endif()
+	if (WIN32)
+		# convert Windows paths in include directories to CMake paths
+		if (_includeDirs)
+			set (_paths "")
+			foreach (_dir ${_includeDirs})
+				file (TO_CMAKE_PATH "${_dir}" _path)
+				list (APPEND _paths "${_path}")
+			endforeach()
+			set (_includeDirs ${_paths})
+		endif()
+		if (_systemIncludeDirs)
+			set (_paths "")
+			foreach (_dir ${_systemIncludeDirs})
+				file (TO_CMAKE_PATH "${_dir}" _path)
+				list (APPEND _paths "${_path}")
+			endforeach()
+			set (_systemIncludeDirs ${_paths})
+		endif()
+	endif()
+	if (COTIRE_DEBUG AND _includeDirs)
+		message (STATUS "Target ${_target} include dirs: ${_includeDirs}")
+	endif()
+	set (${_includeDirsVar} ${_includeDirs} PARENT_SCOPE)
+	if (COTIRE_DEBUG AND _systemIncludeDirs)
+		message (STATUS "Target ${_target} system include dirs: ${_systemIncludeDirs}")
+	endif()
+	set (${_systemIncludeDirsVar} ${_systemIncludeDirs} PARENT_SCOPE)
+endfunction()
+
+function (cotire_get_target_export_symbol _target _exportSymbolVar)
+	set (_exportSymbol "")
+	get_target_property(_targetType ${_target} TYPE)
+	get_target_property(_enableExports ${_target} ENABLE_EXPORTS)
+	if (_targetType MATCHES "(SHARED|MODULE)_LIBRARY" OR
+		(_targetType STREQUAL "EXECUTABLE" AND _enableExports))
+		get_target_property(_exportSymbol ${_target} DEFINE_SYMBOL)
+		if (NOT _exportSymbol)
+			set (_exportSymbol "${_target}_EXPORTS")
+		endif()
+		string (MAKE_C_IDENTIFIER "${_exportSymbol}" _exportSymbol)
+	endif()
+	set (${_exportSymbolVar} ${_exportSymbol} PARENT_SCOPE)
+endfunction()
+
+function (cotire_get_target_compile_definitions _config _language _target _definitionsVar)
+	string (TOUPPER "${_config}" _upperConfig)
+	set (_configDefinitions "")
+	# CMAKE_INTDIR for multi-configuration build systems
+	if (NOT "${CMAKE_CFG_INTDIR}" STREQUAL ".")
+		list (APPEND _configDefinitions "CMAKE_INTDIR=\"${_config}\"")
+	endif()
+	# target export define symbol
+	cotire_get_target_export_symbol("${_target}" _defineSymbol)
+	if (_defineSymbol)
+		list (APPEND _configDefinitions "${_defineSymbol}")
+	endif()
+	# directory compile definitions
+	get_directory_property(_definitions DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}" COMPILE_DEFINITIONS)
+	if (_definitions)
+		list (APPEND _configDefinitions ${_definitions})
+	endif()
+	get_directory_property(_definitions DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}" COMPILE_DEFINITIONS_${_upperConfig})
+	if (_definitions)
+		list (APPEND _configDefinitions ${_definitions})
+	endif()
+	# target compile definitions
+	get_target_property(_definitions ${_target} COMPILE_DEFINITIONS)
+	if (_definitions)
+		list (APPEND _configDefinitions ${_definitions})
+	endif()
+	get_target_property(_definitions ${_target} COMPILE_DEFINITIONS_${_upperConfig})
+	if (_definitions)
+		list (APPEND _configDefinitions ${_definitions})
+	endif()
+	# interface compile definitions from linked library targets
+	set (_linkedTargets "")
+	cotire_get_target_usage_requirements(${_target} _linkedTargets)
+	foreach (_linkedTarget ${_linkedTargets})
+		get_target_property(_definitions ${_linkedTarget} INTERFACE_COMPILE_DEFINITIONS)
+		if (_definitions)
+			list (APPEND _configDefinitions ${_definitions})
+		endif()
+	endforeach()
+	# parse additional compile definitions from target compile flags
+	# and don't look at directory compile definitions, which we already handled
+	set (_targetFlags "")
+	cotire_get_target_compile_flags("${_config}" "${_language}" "${_target}" _targetFlags)
+	cotire_filter_compile_flags("${_language}" "D" _definitions _ignore ${_targetFlags})
+	if (_definitions)
+		list (APPEND _configDefinitions ${_definitions})
+	endif()
+	list (REMOVE_DUPLICATES _configDefinitions)
+	if (COTIRE_DEBUG AND _configDefinitions)
+		message (STATUS "Target ${_target} compile definitions: ${_configDefinitions}")
+	endif()
+	set (${_definitionsVar} ${_configDefinitions} PARENT_SCOPE)
+endfunction()
+
+function (cotire_get_target_compiler_flags _config _language _target _compilerFlagsVar)
+	# parse target compile flags omitting compile definitions and include directives
+	set (_targetFlags "")
+	cotire_get_target_compile_flags("${_config}" "${_language}" "${_target}" _targetFlags)
+	set (_flagFilter "D")
+	if (CMAKE_INCLUDE_FLAG_${_language})
+		string (STRIP "${CMAKE_INCLUDE_FLAG_${_language}}" _includeFlag)
+		string (REGEX REPLACE "^[-/]+" "" _includeFlag "${_includeFlag}")
+		if (_includeFlag)
+			set (_flagFilter "${_flagFilter}|${_includeFlag}")
+		endif()
+	endif()
+	if (CMAKE_INCLUDE_SYSTEM_FLAG_${_language})
+		string (STRIP "${CMAKE_INCLUDE_SYSTEM_FLAG_${_language}}" _includeFlag)
+		string (REGEX REPLACE "^[-/]+" "" _includeFlag "${_includeFlag}")
+		if (_includeFlag)
+			set (_flagFilter "${_flagFilter}|${_includeFlag}")
+		endif()
+	endif()
+	set (_compilerFlags "")
+	cotire_filter_compile_flags("${_language}" "${_flagFilter}" _ignore _compilerFlags ${_targetFlags})
+	if (COTIRE_DEBUG AND _compilerFlags)
+		message (STATUS "Target ${_target} compiler flags: ${_compilerFlags}")
+	endif()
+	set (${_compilerFlagsVar} ${_compilerFlags} PARENT_SCOPE)
+endfunction()
+
+function (cotire_add_sys_root_paths _pathsVar)
+	if (APPLE)
+		if (CMAKE_OSX_SYSROOT AND CMAKE_${_language}_HAS_ISYSROOT)
+			foreach (_path IN LISTS ${_pathsVar})
+				if (IS_ABSOLUTE "${_path}")
+					get_filename_component(_path "${CMAKE_OSX_SYSROOT}/${_path}" ABSOLUTE)
+					if (EXISTS "${_path}")
+						list (APPEND ${_pathsVar} "${_path}")
+					endif()
+				endif()
+			endforeach()
+		endif()
+	endif()
+	set (${_pathsVar} ${${_pathsVar}} PARENT_SCOPE)
+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 _compilerLauncher _compilerExe _compilerArg1)
+	if (NOT _compilerLauncher)
+		set (_compilerLauncher ${CMAKE_${_language}_COMPILER_LAUNCHER})
+	endif()
+	if (NOT _compilerExe)
+		set (_compilerExe "${CMAKE_${_language}_COMPILER}")
+	endif()
+	if (NOT _compilerArg1)
+		set (_compilerArg1 ${CMAKE_${_language}_COMPILER_ARG1})
+	endif()
+	string (STRIP "${_compilerArg1}" _compilerArg1)
+	if ("${CMAKE_GENERATOR}" MATCHES "Make|Ninja")
+		# compiler launcher is only supported for Makefile and Ninja
+		set (${_cmdVar} ${_compilerLauncher} "${_compilerExe}" ${_compilerArg1} PARENT_SCOPE)
+	else()
+		set (${_cmdVar} "${_compilerExe}" ${_compilerArg1} PARENT_SCOPE)
+	endif()
+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()
+
+function (cotire_add_includes_to_cmd _cmdVar _language _includesVar _systemIncludesVar)
+	set (_includeDirs ${${_includesVar}} ${${_systemIncludesVar}})
+	if (_includeDirs)
+		list (REMOVE_DUPLICATES _includeDirs)
+		foreach (_include ${_includeDirs})
+			if (WIN32 AND CMAKE_${_language}_COMPILER_ID MATCHES "MSVC|Intel")
+				file (TO_NATIVE_PATH "${_include}" _include)
+				list (APPEND ${_cmdVar} "${CMAKE_INCLUDE_FLAG_${_language}}${CMAKE_INCLUDE_FLAG_${_language}_SEP}${_include}")
+			else()
+				set (_index -1)
+				if ("${CMAKE_INCLUDE_SYSTEM_FLAG_${_language}}" MATCHES ".+")
+					list (FIND ${_systemIncludesVar} "${_include}" _index)
+				endif()
+				if (_index GREATER -1)
+					list (APPEND ${_cmdVar} "${CMAKE_INCLUDE_SYSTEM_FLAG_${_language}}${_include}")
+				else()
+					list (APPEND ${_cmdVar} "${CMAKE_INCLUDE_FLAG_${_language}}${CMAKE_INCLUDE_FLAG_${_language}_SEP}${_include}")
+				endif()
+			endif()
+		endforeach()
+	endif()
+	set (${_cmdVar} ${${_cmdVar}} PARENT_SCOPE)
+endfunction()
+
+function (cotire_add_frameworks_to_cmd _cmdVar _language _includesVar _systemIncludesVar)
+	if (APPLE)
+		set (_frameworkDirs "")
+		foreach (_include ${${_includesVar}})
+			if (IS_ABSOLUTE "${_include}" AND _include MATCHES "\\.framework$")
+				get_filename_component(_frameworkDir "${_include}" DIRECTORY)
+				list (APPEND _frameworkDirs "${_frameworkDir}")
+			endif()
+		endforeach()
+		set (_systemFrameworkDirs "")
+		foreach (_include ${${_systemIncludesVar}})
+			if (IS_ABSOLUTE "${_include}" AND _include MATCHES "\\.framework$")
+				get_filename_component(_frameworkDir "${_include}" DIRECTORY)
+				list (APPEND _systemFrameworkDirs "${_frameworkDir}")
+			endif()
+		endforeach()
+		if (_systemFrameworkDirs)
+			list (APPEND _frameworkDirs ${_systemFrameworkDirs})
+		endif()
+		if (_frameworkDirs)
+			list (REMOVE_DUPLICATES _frameworkDirs)
+			foreach (_frameworkDir ${_frameworkDirs})
+				set (_index -1)
+				if ("${CMAKE_${_language}_SYSTEM_FRAMEWORK_SEARCH_FLAG}" MATCHES ".+")
+					list (FIND _systemFrameworkDirs "${_frameworkDir}" _index)
+				endif()
+				if (_index GREATER -1)
+					list (APPEND ${_cmdVar} "${CMAKE_${_language}_SYSTEM_FRAMEWORK_SEARCH_FLAG}${_frameworkDir}")
+				else()
+					list (APPEND ${_cmdVar} "${CMAKE_${_language}_FRAMEWORK_SEARCH_FLAG}${_frameworkDir}")
+				endif()
+			endforeach()
+		endif()
+	endif()
+	set (${_cmdVar} ${${_cmdVar}} PARENT_SCOPE)
+endfunction()
+
+macro (cotire_add_compile_flags_to_cmd _cmdVar)
+	foreach (_flag ${ARGN})
+		list (APPEND ${_cmdVar} "${_flag}")
+	endforeach()
+endmacro()
+
+function (cotire_check_file_up_to_date _fileIsUpToDateVar _file)
+	if (EXISTS "${_file}")
+		set (_triggerFile "")
+		foreach (_dependencyFile ${ARGN})
+			if (EXISTS "${_dependencyFile}")
+				# IS_NEWER_THAN returns TRUE if both files have the same timestamp
+				# thus we do the comparison in both directions to exclude ties
+				if ("${_dependencyFile}" IS_NEWER_THAN "${_file}" AND
+					NOT "${_file}" IS_NEWER_THAN "${_dependencyFile}")
+					set (_triggerFile "${_dependencyFile}")
+					break()
+				endif()
+			endif()
+		endforeach()
+		if (_triggerFile)
+			if (COTIRE_VERBOSE)
+				get_filename_component(_fileName "${_file}" NAME)
+				message (STATUS "${_fileName} update triggered by ${_triggerFile} change.")
+			endif()
+			set (${_fileIsUpToDateVar} FALSE PARENT_SCOPE)
+		else()
+			if (COTIRE_VERBOSE)
+				get_filename_component(_fileName "${_file}" NAME)
+				message (STATUS "${_fileName} is up-to-date.")
+			endif()
+			set (${_fileIsUpToDateVar} TRUE PARENT_SCOPE)
+		endif()
+	else()
+		if (COTIRE_VERBOSE)
+			get_filename_component(_fileName "${_file}" NAME)
+			message (STATUS "${_fileName} does not exist yet.")
+		endif()
+		set (${_fileIsUpToDateVar} FALSE PARENT_SCOPE)
+	endif()
+endfunction()
+
+macro (cotire_find_closest_relative_path _headerFile _includeDirs _relPathVar)
+	set (${_relPathVar} "")
+	foreach (_includeDir ${_includeDirs})
+		if (IS_DIRECTORY "${_includeDir}")
+			file (RELATIVE_PATH _relPath "${_includeDir}" "${_headerFile}")
+			if (NOT IS_ABSOLUTE "${_relPath}" AND NOT "${_relPath}" MATCHES "^\\.\\.")
+				string (LENGTH "${${_relPathVar}}" _closestLen)
+				string (LENGTH "${_relPath}" _relLen)
+				if (_closestLen EQUAL 0 OR _relLen LESS _closestLen)
+					set (${_relPathVar} "${_relPath}")
+				endif()
+			endif()
+		elseif ("${_includeDir}" STREQUAL "${_headerFile}")
+			# if path matches exactly, return short non-empty string
+			set (${_relPathVar} "1")
+			break()
+		endif()
+	endforeach()
+endmacro()
+
+macro (cotire_check_header_file_location _headerFile _insideIncludeDirs _outsideIncludeDirs _headerIsInside)
+	# check header path against ignored and honored include directories
+	cotire_find_closest_relative_path("${_headerFile}" "${_insideIncludeDirs}" _insideRelPath)
+	if (_insideRelPath)
+		# header is inside, but could be become outside if there is a shorter outside match
+		cotire_find_closest_relative_path("${_headerFile}" "${_outsideIncludeDirs}" _outsideRelPath)
+		if (_outsideRelPath)
+			string (LENGTH "${_insideRelPath}" _insideRelPathLen)
+			string (LENGTH "${_outsideRelPath}" _outsideRelPathLen)
+			if (_outsideRelPathLen LESS _insideRelPathLen)
+				set (${_headerIsInside} FALSE)
+			else()
+				set (${_headerIsInside} TRUE)
+			endif()
+		else()
+			set (${_headerIsInside} TRUE)
+		endif()
+	else()
+		# header is outside
+		set (${_headerIsInside} FALSE)
+	endif()
+endmacro()
+
+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 (${_headerIsIgnoredVar} TRUE)
+		endif()
+	endif()
+endmacro()
+
+macro (cotire_parse_line _line _headerFileVar _headerDepthVar)
+	if (MSVC)
+		# cl.exe /showIncludes output looks different depending on the language pack used, e.g.:
+		# English: "Note: including file:   C:\directory\file"
+		# German: "Hinweis: Einlesen der Datei:   C:\directory\file"
+		# We use a very general regular expression, relying on the presence of the : characters
+		if (_line MATCHES "( +)([a-zA-Z]:[^:]+)$")
+			# Visual Studio compiler output
+			string (LENGTH "${CMAKE_MATCH_1}" ${_headerDepthVar})
+			get_filename_component(${_headerFileVar} "${CMAKE_MATCH_2}" ABSOLUTE)
+		else()
+			set (${_headerFileVar} "")
+			set (${_headerDepthVar} 0)
+		endif()
+	else()
+		if (_line MATCHES "^(\\.+) (.*)$")
+			# GCC like output
+			string (LENGTH "${CMAKE_MATCH_1}" ${_headerDepthVar})
+			if (IS_ABSOLUTE "${CMAKE_MATCH_2}")
+				set (${_headerFileVar} "${CMAKE_MATCH_2}")
+			else()
+				get_filename_component(${_headerFileVar} "${CMAKE_MATCH_2}" REALPATH)
+			endif()
+		else()
+			set (${_headerFileVar} "")
+			set (${_headerDepthVar} 0)
+		endif()
+	endif()
+endmacro()
+
+function (cotire_parse_includes _language _scanOutput _ignoredIncludeDirs _honoredIncludeDirs _ignoredExtensions _selectedIncludesVar _unparsedLinesVar)
+	if (WIN32)
+		# prevent CMake macro invocation errors due to backslash characters in Windows paths
+		string (REPLACE "\\" "/" _scanOutput "${_scanOutput}")
+	endif()
+	# canonize slashes
+	string (REPLACE "//" "/" _scanOutput "${_scanOutput}")
+	# prevent semicolon from being interpreted as a line separator
+	string (REPLACE ";" "\\;" _scanOutput "${_scanOutput}")
+	# then separate lines
+	string (REGEX REPLACE "\n" ";" _scanOutput "${_scanOutput}")
+	list (LENGTH _scanOutput _len)
+	# remove duplicate lines to speed up parsing
+	list (REMOVE_DUPLICATES _scanOutput)
+	list (LENGTH _scanOutput _uniqueLen)
+	if (COTIRE_VERBOSE OR COTIRE_DEBUG)
+		message (STATUS "Scanning ${_uniqueLen} unique lines of ${_len} for includes")
+		if (_ignoredExtensions)
+			message (STATUS "Ignored extensions: ${_ignoredExtensions}")
+		endif()
+		if (_ignoredIncludeDirs)
+			message (STATUS "Ignored paths: ${_ignoredIncludeDirs}")
+		endif()
+		if (_honoredIncludeDirs)
+			message (STATUS "Included paths: ${_honoredIncludeDirs}")
+		endif()
+	endif()
+	set (_sourceFiles ${ARGN})
+	set (_selectedIncludes "")
+	set (_unparsedLines "")
+	# stack keeps track of inside/outside project status of processed header files
+	set (_headerIsInsideStack "")
+	foreach (_line IN LISTS _scanOutput)
+		if (_line)
+			cotire_parse_line("${_line}" _headerFile _headerDepth)
+			if (_headerFile)
+				cotire_check_header_file_location("${_headerFile}" "${_ignoredIncludeDirs}" "${_honoredIncludeDirs}" _headerIsInside)
+				if (COTIRE_DEBUG)
+					message (STATUS "${_headerDepth}: ${_headerFile} ${_headerIsInside}")
+				endif()
+				# update stack
+				list (LENGTH _headerIsInsideStack _stackLen)
+				if (_headerDepth GREATER _stackLen)
+					math (EXPR _stackLen "${_stackLen} + 1")
+					foreach (_index RANGE ${_stackLen} ${_headerDepth})
+						list (APPEND _headerIsInsideStack ${_headerIsInside})
+					endforeach()
+				else()
+					foreach (_index RANGE ${_headerDepth} ${_stackLen})
+						list (REMOVE_AT _headerIsInsideStack -1)
+					endforeach()
+					list (APPEND _headerIsInsideStack ${_headerIsInside})
+				endif()
+				if (COTIRE_DEBUG)
+					message (STATUS "${_headerIsInsideStack}")
+				endif()
+				# header is a candidate if it is outside project
+				if (NOT _headerIsInside)
+					# get parent header file's inside/outside status
+					if (_headerDepth GREATER 1)
+						math (EXPR _index "${_headerDepth} - 2")
+						list (GET _headerIsInsideStack ${_index} _parentHeaderIsInside)
+					else()
+						set (_parentHeaderIsInside TRUE)
+					endif()
+					# select header file if parent header file is inside project
+					# (e.g., a project header file that includes a standard header file)
+					if (_parentHeaderIsInside)
+						cotire_check_ignore_header_file_path("${_headerFile}" _headerIsIgnored)
+						if (NOT _headerIsIgnored)
+							cotire_check_ignore_header_file_ext("${_headerFile}" _ignoredExtensions _headerIsIgnored)
+							if (NOT _headerIsIgnored)
+								list (APPEND _selectedIncludes "${_headerFile}")
+							else()
+								# fix header's inside status on stack, it is ignored by extension now
+								list (REMOVE_AT _headerIsInsideStack -1)
+								list (APPEND _headerIsInsideStack TRUE)
+							endif()
+						endif()
+						if (COTIRE_DEBUG)
+							message (STATUS "${_headerFile} ${_ignoredExtensions} ${_headerIsIgnored}")
+						endif()
+					endif()
+				endif()
+			else()
+				if (MSVC)
+					# for cl.exe do not keep unparsed lines which solely consist of a source file name
+					string (FIND "${_sourceFiles}" "${_line}" _index)
+					if (_index LESS 0)
+						list (APPEND _unparsedLines "${_line}")
+					endif()
+				else()
+					list (APPEND _unparsedLines "${_line}")
+				endif()
+			endif()
+		endif()
+	endforeach()
+	list (REMOVE_DUPLICATES _selectedIncludes)
+	set (${_selectedIncludesVar} ${_selectedIncludes} PARENT_SCOPE)
+	set (${_unparsedLinesVar} ${_unparsedLines} PARENT_SCOPE)
+endfunction()
+
+function (cotire_scan_includes _includesVar)
+	set(_options "")
+	set(_oneValueArgs COMPILER_ID COMPILER_EXECUTABLE COMPILER_ARG1 COMPILER_VERSION LANGUAGE UNPARSED_LINES SCAN_RESULT)
+	set(_multiValueArgs COMPILE_DEFINITIONS COMPILE_FLAGS INCLUDE_DIRECTORIES SYSTEM_INCLUDE_DIRECTORIES
+		IGNORE_PATH INCLUDE_PATH IGNORE_EXTENSIONS INCLUDE_PRIORITY_PATH COMPILER_LAUNCHER)
+	cmake_parse_arguments(_option "${_options}" "${_oneValueArgs}" "${_multiValueArgs}" ${ARGN})
+	set (_sourceFiles ${_option_UNPARSED_ARGUMENTS})
+	if (NOT _option_LANGUAGE)
+		set (_option_LANGUAGE "CXX")
+	endif()
+	if (NOT _option_COMPILER_ID)
+		set (_option_COMPILER_ID "${CMAKE_${_option_LANGUAGE}_ID}")
+	endif()
+	if (NOT _option_COMPILER_VERSION)
+		set (_option_COMPILER_VERSION "${CMAKE_${_option_LANGUAGE}_COMPILER_VERSION}")
+	endif()
+	cotire_init_compile_cmd(_cmd "${_option_LANGUAGE}" "${_option_COMPILER_LAUNCHER}" "${_option_COMPILER_EXECUTABLE}" "${_option_COMPILER_ARG1}")
+	cotire_add_definitions_to_cmd(_cmd "${_option_LANGUAGE}" ${_option_COMPILE_DEFINITIONS})
+	cotire_add_compile_flags_to_cmd(_cmd ${_option_COMPILE_FLAGS})
+	cotire_add_includes_to_cmd(_cmd "${_option_LANGUAGE}" _option_INCLUDE_DIRECTORIES _option_SYSTEM_INCLUDE_DIRECTORIES)
+	cotire_add_frameworks_to_cmd(_cmd "${_option_LANGUAGE}" _option_INCLUDE_DIRECTORIES _option_SYSTEM_INCLUDE_DIRECTORIES)
+	cotire_add_makedep_flags("${_option_LANGUAGE}" "${_option_COMPILER_ID}" "${_option_COMPILER_VERSION}" _cmd)
+	# only consider existing source files for scanning
+	set (_existingSourceFiles "")
+	foreach (_sourceFile ${_sourceFiles})
+		if (EXISTS "${_sourceFile}")
+			list (APPEND _existingSourceFiles "${_sourceFile}")
+		endif()
+	endforeach()
+	if (NOT _existingSourceFiles)
+		set (${_includesVar} "" PARENT_SCOPE)
+		return()
+	endif()
+	list (APPEND _cmd ${_existingSourceFiles})
+	if (COTIRE_VERBOSE)
+		message (STATUS "execute_process: ${_cmd}")
+	endif()
+	if (_option_COMPILER_ID MATCHES "MSVC")
+		# cl.exe messes with the output streams unless the environment variable VS_UNICODE_OUTPUT is cleared
+		unset (ENV{VS_UNICODE_OUTPUT})
+	endif()
+	execute_process(
+		COMMAND ${_cmd}
+		WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
+		RESULT_VARIABLE _result
+		OUTPUT_QUIET
+		ERROR_VARIABLE _output)
+	if (_result)
+		message (STATUS "Result ${_result} scanning includes of ${_existingSourceFiles}.")
+	endif()
+	cotire_parse_includes(
+		"${_option_LANGUAGE}" "${_output}"
+		"${_option_IGNORE_PATH}" "${_option_INCLUDE_PATH}"
+		"${_option_IGNORE_EXTENSIONS}"
+		_includes _unparsedLines
+		${_sourceFiles})
+	if (_option_INCLUDE_PRIORITY_PATH)
+		set (_sortedIncludes "")
+		foreach (_priorityPath ${_option_INCLUDE_PRIORITY_PATH})
+			foreach (_include ${_includes})
+				string (FIND ${_include} ${_priorityPath} _position)
+				if (_position GREATER -1)
+					list (APPEND _sortedIncludes ${_include})
+				endif()
+			endforeach()
+		endforeach()
+		if (_sortedIncludes)
+			list (INSERT _includes 0 ${_sortedIncludes})
+			list (REMOVE_DUPLICATES _includes)
+		endif()
+	endif()
+	set (${_includesVar} ${_includes} PARENT_SCOPE)
+	if (_option_UNPARSED_LINES)
+		set (${_option_UNPARSED_LINES} ${_unparsedLines} PARENT_SCOPE)
+	endif()
+	if (_option_SCAN_RESULT)
+		set (${_option_SCAN_RESULT} ${_result} 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()
+		# use absolute path as source file location
+		get_filename_component(_sourceFileLocation "${_sourceFile}" ABSOLUTE)
+		if (WIN32)
+			file (TO_NATIVE_PATH "${_sourceFileLocation}" _sourceFileLocation)
+		endif()
+		list (APPEND _contents "#include \"${_sourceFileLocation}\"")
+	endforeach()
+	if (_compileUndefinitions)
+		cotire_append_undefs(_contents ${_compileUndefinitions})
+		set (_compileUndefinitions "")
+	endif()
+	if (_option_LANGUAGE AND _sourceFiles)
+		list (APPEND _contents "#endif")
+	endif()
+	if (_option_EPILOGUE)
+		list (APPEND _contents ${_option_EPILOGUE})
+	endif()
+	list (APPEND _contents "")
+	string (REPLACE ";" "\n" _contents "${_contents}")
+	if (COTIRE_VERBOSE)
+		message ("${_contents}")
+	endif()
+	cotire_write_file("${_option_LANGUAGE}" "${_unityFile}" "${_contents}" TRUE)
+endfunction()
+
+function (cotire_generate_prefix_header _prefixFile)
+	set(_options "")
+	set(_oneValueArgs LANGUAGE COMPILER_EXECUTABLE COMPILER_ARG1 COMPILER_ID COMPILER_VERSION)
+	set(_multiValueArgs DEPENDS COMPILE_DEFINITIONS COMPILE_FLAGS
+		INCLUDE_DIRECTORIES SYSTEM_INCLUDE_DIRECTORIES IGNORE_PATH INCLUDE_PATH
+		IGNORE_EXTENSIONS INCLUDE_PRIORITY_PATH COMPILER_LAUNCHER)
+	cmake_parse_arguments(_option "${_options}" "${_oneValueArgs}" "${_multiValueArgs}" ${ARGN})
+	if (NOT _option_COMPILER_ID)
+		set (_option_COMPILER_ID "${CMAKE_${_option_LANGUAGE}_ID}")
+	endif()
+	if (NOT _option_COMPILER_VERSION)
+		set (_option_COMPILER_VERSION "${CMAKE_${_option_LANGUAGE}_COMPILER_VERSION}")
+	endif()
+	if (_option_DEPENDS)
+		cotire_check_file_up_to_date(_prefixFileIsUpToDate "${_prefixFile}" ${_option_DEPENDS})
+		if (_prefixFileIsUpToDate)
+			# create empty log file
+			set (_unparsedLinesFile "${_prefixFile}.log")
+			file (WRITE "${_unparsedLinesFile}" "")
+			return()
+		endif()
+	endif()
+	set (_prologue "")
+	set (_epilogue "")
+	if (_option_COMPILER_ID MATCHES "Clang")
+		set (_prologue "#pragma clang system_header")
+	elseif (_option_COMPILER_ID MATCHES "GNU")
+		set (_prologue "#pragma GCC system_header")
+	elseif (_option_COMPILER_ID MATCHES "MSVC")
+		set (_prologue "#pragma warning(push, 0)")
+		set (_epilogue "#pragma warning(pop)")
+	elseif (_option_COMPILER_ID MATCHES "Intel")
+		# Intel compiler requires hdrstop pragma to stop generating PCH file
+		set (_epilogue "#pragma hdrstop")
+	endif()
+	set (_sourceFiles ${_option_UNPARSED_ARGUMENTS})
+	cotire_scan_includes(_selectedHeaders ${_sourceFiles}
+		LANGUAGE "${_option_LANGUAGE}"
+		COMPILER_LAUNCHER "${_option_COMPILER_LAUNCHER}"
+		COMPILER_EXECUTABLE "${_option_COMPILER_EXECUTABLE}"
+		COMPILER_ARG1 "${_option_COMPILER_ARG1}"
+		COMPILER_ID "${_option_COMPILER_ID}"
+		COMPILER_VERSION "${_option_COMPILER_VERSION}"
+		COMPILE_DEFINITIONS ${_option_COMPILE_DEFINITIONS}
+		COMPILE_FLAGS ${_option_COMPILE_FLAGS}
+		INCLUDE_DIRECTORIES ${_option_INCLUDE_DIRECTORIES}
+		SYSTEM_INCLUDE_DIRECTORIES ${_option_SYSTEM_INCLUDE_DIRECTORIES}
+		IGNORE_PATH ${_option_IGNORE_PATH}
+		INCLUDE_PATH ${_option_INCLUDE_PATH}
+		IGNORE_EXTENSIONS ${_option_IGNORE_EXTENSIONS}
+		INCLUDE_PRIORITY_PATH ${_option_INCLUDE_PRIORITY_PATH}
+		UNPARSED_LINES _unparsedLines
+		SCAN_RESULT _scanResult)
+	cotire_generate_unity_source("${_prefixFile}"
+		PROLOGUE ${_prologue} EPILOGUE ${_epilogue} LANGUAGE "${_option_LANGUAGE}" ${_selectedHeaders})
+	set (_unparsedLinesFile "${_prefixFile}.log")
+	if (_unparsedLines)
+		if (COTIRE_VERBOSE OR _scanResult OR NOT _selectedHeaders)
+			list (LENGTH _unparsedLines _skippedLineCount)
+			message (STATUS "${_skippedLineCount} line(s) skipped, see ${_unparsedLinesFile}")
+		endif()
+		string (REPLACE ";" "\n" _unparsedLines "${_unparsedLines}")
+	endif()
+	file (WRITE "${_unparsedLinesFile}" "${_unparsedLines}")
+endfunction()
+
+function (cotire_add_makedep_flags _language _compilerID _compilerVersion _flagsVar)
+	set (_flags ${${_flagsVar}})
+	if (_compilerID MATCHES "MSVC")
+		# cl.exe options used
+		# /nologo suppresses display of sign-on banner
+		# /TC treat all files named on the command line as C source files
+		# /TP treat all files named on the command line as C++ source files
+		# /EP preprocess to stdout without #line directives
+		# /showIncludes list include files
+		set (_sourceFileTypeC "/TC")
+		set (_sourceFileTypeCXX "/TP")
+		if (_flags)
+			# append to list
+			list (APPEND _flags /nologo "${_sourceFileType${_language}}" /EP /showIncludes)
+		else()
+			# return as a flag string
+			set (_flags "${_sourceFileType${_language}} /EP /showIncludes")
+		endif()
+	elseif (_compilerID MATCHES "GNU")
+		# GCC options used
+		# -H print the name of each header file used
+		# -E invoke preprocessor
+		# -fdirectives-only do not expand macros, requires GCC >= 4.3
+		if (_flags)
+			# append to list
+			list (APPEND _flags -H -E)
+			if (NOT "${_compilerVersion}" VERSION_LESS "4.3.0")
+				list (APPEND _flags "-fdirectives-only")
+			endif()
+		else()
+			# return as a flag string
+			set (_flags "-H -E")
+			if (NOT "${_compilerVersion}" VERSION_LESS "4.3.0")
+				set (_flags "${_flags} -fdirectives-only")
+			endif()
+		endif()
+	elseif (_compilerID MATCHES "Clang")
+		# Clang options used
+		# -H print the name of each header file used
+		# -E invoke preprocessor
+		# -fno-color-diagnostics don't prints diagnostics in color
+		if (_flags)
+			# append to list
+			list (APPEND _flags -H -E -fno-color-diagnostics)
+		else()
+			# return as a flag string
+			set (_flags "-H -E -fno-color-diagnostics")
+		endif()
+	elseif (_compilerID MATCHES "Intel")
+		if (WIN32)
+			# Windows Intel options used
+			# /nologo do not display compiler version information
+			# /QH display the include file order
+			# /EP preprocess to stdout, omitting #line directives
+			# /TC process all source or unrecognized file types as C source files
+			# /TP process all source or unrecognized file types as C++ source files
+			set (_sourceFileTypeC "/TC")
+			set (_sourceFileTypeCXX "/TP")
+			if (_flags)
+				# append to list
+				list (APPEND _flags /nologo "${_sourceFileType${_language}}" /EP /QH)
+			else()
+				# return as a flag string
+				set (_flags "${_sourceFileType${_language}} /EP /QH")
+			endif()
+		else()
+			# Linux / Mac OS X Intel options used
+			# -H print the name of each header file used
+			# -EP preprocess to stdout, omitting #line directives
+			# -Kc++ process all source or unrecognized file types as C++ source files
+			if (_flags)
+				# append to list
+				if ("${_language}" STREQUAL "CXX")
+					list (APPEND _flags -Kc++)
+				endif()
+				list (APPEND _flags -H -EP)
+			else()
+				# return as a flag string
+				if ("${_language}" STREQUAL "CXX")
+					set (_flags "-Kc++ ")
+				endif()
+				set (_flags "${_flags}-H -EP")
+			endif()
+		endif()
+	else()
+		message (FATAL_ERROR "cotire: unsupported ${_language} compiler ${_compilerID} version ${_compilerVersion}.")
+	endif()
+	set (${_flagsVar} ${_flags} PARENT_SCOPE)
+endfunction()
+
+function (cotire_add_pch_compilation_flags _language _compilerID _compilerVersion _prefixFile _pchFile _hostFile _flagsVar)
+	set (_flags ${${_flagsVar}})
+	if (_compilerID MATCHES "MSVC")
+		file (TO_NATIVE_PATH "${_prefixFile}" _prefixFileNative)
+		file (TO_NATIVE_PATH "${_pchFile}" _pchFileNative)
+		file (TO_NATIVE_PATH "${_hostFile}" _hostFileNative)
+		# cl.exe options used
+		# /Yc creates a precompiled header file
+		# /Fp specifies precompiled header binary file name
+		# /FI forces inclusion of file
+		# /TC treat all files named on the command line as C source files
+		# /TP treat all files named on the command line as C++ source files
+		# /Zs syntax check only
+		# /Zm precompiled header memory allocation scaling factor
+		set (_sourceFileTypeC "/TC")
+		set (_sourceFileTypeCXX "/TP")
+		if (_flags)
+			# append to list
+			list (APPEND _flags /nologo "${_sourceFileType${_language}}"
+				"/Yc${_prefixFileNative}" "/Fp${_pchFileNative}" "/FI${_prefixFileNative}" /Zs "${_hostFileNative}")
+			if (COTIRE_PCH_MEMORY_SCALING_FACTOR)
+				list (APPEND _flags "/Zm${COTIRE_PCH_MEMORY_SCALING_FACTOR}")
+			endif()
+		else()
+			# return as a flag string
+			set (_flags "/Yc\"${_prefixFileNative}\" /Fp\"${_pchFileNative}\" /FI\"${_prefixFileNative}\"")
+			if (COTIRE_PCH_MEMORY_SCALING_FACTOR)
+				set (_flags "${_flags} /Zm${COTIRE_PCH_MEMORY_SCALING_FACTOR}")
+			endif()
+		endif()
+	elseif (_compilerID MATCHES "GNU|Clang")
+		# GCC / Clang options used
+		# -x specify the source language
+		# -c compile but do not link
+		# -o place output in file
+		# note that we cannot use -w to suppress all warnings upon pre-compiling, because turning off a warning may
+		# alter compile flags as a side effect (e.g., -Wwrite-string implies -fconst-strings)
+		set (_xLanguage_C "c-header")
+		set (_xLanguage_CXX "c++-header")
+		if (_flags)
+			# append to list
+			list (APPEND _flags "-x" "${_xLanguage_${_language}}" "-c" "${_prefixFile}" -o "${_pchFile}")
+		else()
+			# return as a flag string
+			set (_flags "-x ${_xLanguage_${_language}} -c \"${_prefixFile}\" -o \"${_pchFile}\"")
+		endif()
+	elseif (_compilerID MATCHES "Intel")
+		if (WIN32)
+			file (TO_NATIVE_PATH "${_prefixFile}" _prefixFileNative)
+			file (TO_NATIVE_PATH "${_pchFile}" _pchFileNative)
+			file (TO_NATIVE_PATH "${_hostFile}" _hostFileNative)
+			# Windows Intel options used
+			# /nologo do not display compiler version information
+			# /Yc create a precompiled header (PCH) file
+			# /Fp specify a path or file name for precompiled header files
+			# /FI tells the preprocessor to include a specified file name as the header file
+			# /TC process all source or unrecognized file types as C source files
+			# /TP process all source or unrecognized file types as C++ source files
+			# /Zs syntax check only
+			# /Wpch-messages enable diagnostics related to pre-compiled headers (requires Intel XE 2013 Update 2)
+			set (_sourceFileTypeC "/TC")
+			set (_sourceFileTypeCXX "/TP")
+			if (_flags)
+				# append to list
+				list (APPEND _flags /nologo "${_sourceFileType${_language}}"
+					"/Yc" "/Fp${_pchFileNative}" "/FI${_prefixFileNative}" /Zs "${_hostFileNative}")
+				if (NOT "${_compilerVersion}" VERSION_LESS "13.1.0")
+					list (APPEND _flags "/Wpch-messages")
+				endif()
+			else()
+				# return as a flag string
+				set (_flags "/Yc /Fp\"${_pchFileNative}\" /FI\"${_prefixFileNative}\"")
+				if (NOT "${_compilerVersion}" VERSION_LESS "13.1.0")
+					set (_flags "${_flags} /Wpch-messages")
+				endif()
+			endif()
+		else()
+			# Linux / Mac OS X Intel options used
+			# -pch-dir location for precompiled header files
+			# -pch-create name of the precompiled header (PCH) to create
+			# -Kc++ process all source or unrecognized file types as C++ source files
+			# -fsyntax-only check only for correct syntax
+			# -Wpch-messages enable diagnostics related to pre-compiled headers (requires Intel XE 2013 Update 2)
+			get_filename_component(_pchDir "${_pchFile}" DIRECTORY)
+			get_filename_component(_pchName "${_pchFile}" NAME)
+			set (_xLanguage_C "c-header")
+			set (_xLanguage_CXX "c++-header")
+			if (_flags)
+				# append to list
+				if ("${_language}" STREQUAL "CXX")
+					list (APPEND _flags -Kc++)
+				endif()
+				list (APPEND _flags "-include" "${_prefixFile}" "-pch-dir" "${_pchDir}" "-pch-create" "${_pchName}" "-fsyntax-only" "${_hostFile}")
+				if (NOT "${_compilerVersion}" VERSION_LESS "13.1.0")
+					list (APPEND _flags "-Wpch-messages")
+				endif()
+			else()
+				# return as a flag string
+				set (_flags "-include \"${_prefixFile}\" -pch-dir \"${_pchDir}\" -pch-create \"${_pchName}\"")
+				if (NOT "${_compilerVersion}" VERSION_LESS "13.1.0")
+					set (_flags "${_flags} -Wpch-messages")
+				endif()
+			endif()
+		endif()
+	else()
+		message (FATAL_ERROR "cotire: unsupported ${_language} compiler ${_compilerID} version ${_compilerVersion}.")
+	endif()
+	set (${_flagsVar} ${_flags} PARENT_SCOPE)
+endfunction()
+
+function (cotire_add_prefix_pch_inclusion_flags _language _compilerID _compilerVersion _prefixFile _pchFile _flagsVar)
+	set (_flags ${${_flagsVar}})
+	if (_compilerID MATCHES "MSVC")
+		file (TO_NATIVE_PATH "${_prefixFile}" _prefixFileNative)
+		# cl.exe options used
+		# /Yu uses a precompiled header file during build
+		# /Fp specifies precompiled header binary file name
+		# /FI forces inclusion of file
+		# /Zm precompiled header memory allocation scaling factor
+		if (_pchFile)
+			file (TO_NATIVE_PATH "${_pchFile}" _pchFileNative)
+			if (_flags)
+				# append to list
+				list (APPEND _flags "/Yu${_prefixFileNative}" "/Fp${_pchFileNative}" "/FI${_prefixFileNative}")
+				if (COTIRE_PCH_MEMORY_SCALING_FACTOR)
+					list (APPEND _flags "/Zm${COTIRE_PCH_MEMORY_SCALING_FACTOR}")
+				endif()
+			else()
+				# return as a flag string
+				set (_flags "/Yu\"${_prefixFileNative}\" /Fp\"${_pchFileNative}\" /FI\"${_prefixFileNative}\"")
+				if (COTIRE_PCH_MEMORY_SCALING_FACTOR)
+					set (_flags "${_flags} /Zm${COTIRE_PCH_MEMORY_SCALING_FACTOR}")
+				endif()
+			endif()
+		else()
+			# no precompiled header, force inclusion of prefix header
+			if (_flags)
+				# append to list
+				list (APPEND _flags "/FI${_prefixFileNative}")
+			else()
+				# return as a flag string
+				set (_flags "/FI\"${_prefixFileNative}\"")
+			endif()
+		endif()
+	elseif (_compilerID MATCHES "GNU")
+		# GCC options used
+		# -include process include file as the first line of the primary source file
+		# -Winvalid-pch warns if precompiled header is found but cannot be used
+		# note: ccache requires the -include flag to be used in order to process precompiled header correctly
+		if (_flags)
+			# append to list
+			list (APPEND _flags "-Winvalid-pch" "-include" "${_prefixFile}")
+		else()
+			# return as a flag string
+			set (_flags "-Winvalid-pch -include \"${_prefixFile}\"")
+		endif()
+	elseif (_compilerID MATCHES "Clang")
+		# Clang options used
+		# -include process include file as the first line of the primary source file
+		# -include-pch include precompiled header file
+		# -Qunused-arguments don't emit warning for unused driver arguments
+		# note: ccache requires the -include flag to be used in order to process precompiled header correctly
+		if (_flags)
+			# append to list
+			list (APPEND _flags "-Qunused-arguments" "-include" "${_prefixFile}")
+		else()
+			# return as a flag string
+			set (_flags "-Qunused-arguments -include \"${_prefixFile}\"")
+		endif()
+	elseif (_compilerID MATCHES "Intel")
+		if (WIN32)
+			file (TO_NATIVE_PATH "${_prefixFile}" _prefixFileNative)
+			# Windows Intel options used
+			# /Yu use a precompiled header (PCH) file
+			# /Fp specify a path or file name for precompiled header files
+			# /FI tells the preprocessor to include a specified file name as the header file
+			# /Wpch-messages enable diagnostics related to pre-compiled headers (requires Intel XE 2013 Update 2)
+			if (_pchFile)
+				file (TO_NATIVE_PATH "${_pchFile}" _pchFileNative)
+				if (_flags)
+					# append to list
+					list (APPEND _flags "/Yu" "/Fp${_pchFileNative}" "/FI${_prefixFileNative}")
+					if (NOT "${_compilerVersion}" VERSION_LESS "13.1.0")
+						list (APPEND _flags "/Wpch-messages")
+					endif()
+				else()
+					# return as a flag string
+					set (_flags "/Yu /Fp\"${_pchFileNative}\" /FI\"${_prefixFileNative}\"")
+					if (NOT "${_compilerVersion}" VERSION_LESS "13.1.0")
+						set (_flags "${_flags} /Wpch-messages")
+					endif()
+				endif()
+			else()
+				# no precompiled header, force inclusion of prefix header
+				if (_flags)
+					# append to list
+					list (APPEND _flags "/FI${_prefixFileNative}")
+				else()
+					# return as a flag string
+					set (_flags "/FI\"${_prefixFileNative}\"")
+				endif()
+			endif()
+		else()
+			# Linux / Mac OS X Intel options used
+			# -pch-dir location for precompiled header files
+			# -pch-use name of the precompiled header (PCH) to use
+			# -include process include file as the first line of the primary source file
+			# -Wpch-messages enable diagnostics related to pre-compiled headers (requires Intel XE 2013 Update 2)
+			if (_pchFile)
+				get_filename_component(_pchDir "${_pchFile}" DIRECTORY)
+				get_filename_component(_pchName "${_pchFile}" NAME)
+				if (_flags)
+					# append to list
+					list (APPEND _flags "-include" "${_prefixFile}" "-pch-dir" "${_pchDir}" "-pch-use" "${_pchName}")
+					if (NOT "${_compilerVersion}" VERSION_LESS "13.1.0")
+						list (APPEND _flags "-Wpch-messages")
+					endif()
+				else()
+					# return as a flag string
+					set (_flags "-include \"${_prefixFile}\" -pch-dir \"${_pchDir}\" -pch-use \"${_pchName}\"")
+					if (NOT "${_compilerVersion}" VERSION_LESS "13.1.0")
+						set (_flags "${_flags} -Wpch-messages")
+					endif()
+				endif()
+			else()
+				# no precompiled header, force inclusion of prefix header
+				if (_flags)
+					# append to list
+					list (APPEND _flags "-include" "${_prefixFile}")
+				else()
+					# return as a flag string
+					set (_flags "-include \"${_prefixFile}\"")
+				endif()
+			endif()
+		endif()
+	else()
+		message (FATAL_ERROR "cotire: unsupported ${_language} compiler ${_compilerID} version ${_compilerVersion}.")
+	endif()
+	set (${_flagsVar} ${_flags} PARENT_SCOPE)
+endfunction()
+
+function (cotire_precompile_prefix_header _prefixFile _pchFile _hostFile)
+	set(_options "")
+	set(_oneValueArgs COMPILER_EXECUTABLE COMPILER_ARG1 COMPILER_ID COMPILER_VERSION LANGUAGE)
+	set(_multiValueArgs COMPILE_DEFINITIONS COMPILE_FLAGS INCLUDE_DIRECTORIES SYSTEM_INCLUDE_DIRECTORIES SYS COMPILER_LAUNCHER)
+	cmake_parse_arguments(_option "${_options}" "${_oneValueArgs}" "${_multiValueArgs}" ${ARGN})
+	if (NOT _option_LANGUAGE)
+		set (_option_LANGUAGE "CXX")
+	endif()
+	if (NOT _option_COMPILER_ID)
+		set (_option_COMPILER_ID "${CMAKE_${_option_LANGUAGE}_ID}")
+	endif()
+	if (NOT _option_COMPILER_VERSION)
+		set (_option_COMPILER_VERSION "${CMAKE_${_option_LANGUAGE}_COMPILER_VERSION}")
+	endif()
+	cotire_init_compile_cmd(_cmd "${_option_LANGUAGE}" "${_option_COMPILER_LAUNCHER}" "${_option_COMPILER_EXECUTABLE}" "${_option_COMPILER_ARG1}")
+	cotire_add_definitions_to_cmd(_cmd "${_option_LANGUAGE}" ${_option_COMPILE_DEFINITIONS})
+	cotire_add_compile_flags_to_cmd(_cmd ${_option_COMPILE_FLAGS})
+	cotire_add_includes_to_cmd(_cmd "${_option_LANGUAGE}" _option_INCLUDE_DIRECTORIES _option_SYSTEM_INCLUDE_DIRECTORIES)
+	cotire_add_frameworks_to_cmd(_cmd "${_option_LANGUAGE}" _option_INCLUDE_DIRECTORIES _option_SYSTEM_INCLUDE_DIRECTORIES)
+	cotire_add_pch_compilation_flags(
+		"${_option_LANGUAGE}" "${_option_COMPILER_ID}" "${_option_COMPILER_VERSION}"
+		"${_prefixFile}" "${_pchFile}" "${_hostFile}" _cmd)
+	if (COTIRE_VERBOSE)
+		message (STATUS "execute_process: ${_cmd}")
+	endif()
+	if (_option_COMPILER_ID MATCHES "MSVC")
+		# cl.exe messes with the output streams unless the environment variable VS_UNICODE_OUTPUT is cleared
+		unset (ENV{VS_UNICODE_OUTPUT})
+	endif()
+	execute_process(
+		COMMAND ${_cmd}
+		WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
+		RESULT_VARIABLE _result)
+	if (_result)
+		message (FATAL_ERROR "cotire: error ${_result} precompiling ${_prefixFile}.")
+	endif()
+endfunction()
+
+function (cotire_check_precompiled_header_support _language _target _msgVar)
+	set (_unsupportedCompiler
+		"Precompiled headers not supported for ${_language} compiler ${CMAKE_${_language}_COMPILER_ID}")
+	if (CMAKE_${_language}_COMPILER_ID MATCHES "MSVC")
+		# supported since Visual Studio C++ 6.0
+		# and CMake does not support an earlier version
+		set (${_msgVar} "" PARENT_SCOPE)
+	elseif (CMAKE_${_language}_COMPILER_ID MATCHES "GNU")
+		# GCC PCH support requires version >= 3.4
+		if ("${CMAKE_${_language}_COMPILER_VERSION}" VERSION_LESS "3.4.0")
+			set (${_msgVar} "${_unsupportedCompiler} version ${CMAKE_${_language}_COMPILER_VERSION}." PARENT_SCOPE)
+		else()
+			set (${_msgVar} "" PARENT_SCOPE)
+		endif()
+	elseif (CMAKE_${_language}_COMPILER_ID MATCHES "Clang")
+		# all Clang versions have PCH support
+		set (${_msgVar} "" PARENT_SCOPE)
+	elseif (CMAKE_${_language}_COMPILER_ID MATCHES "Intel")
+		# Intel PCH support requires version >= 8.0.0
+		if ("${CMAKE_${_language}_COMPILER_VERSION}" VERSION_LESS "8.0.0")
+			set (${_msgVar} "${_unsupportedCompiler} version ${CMAKE_${_language}_COMPILER_VERSION}." PARENT_SCOPE)
+		else()
+			set (${_msgVar} "" PARENT_SCOPE)
+		endif()
+	else()
+		set (${_msgVar} "${_unsupportedCompiler}." PARENT_SCOPE)
+	endif()
+	get_target_property(_launcher ${_target} ${_language}_COMPILER_LAUNCHER)
+	if (CMAKE_${_language}_COMPILER MATCHES "ccache" OR _launcher MATCHES "ccache")
+		if (DEFINED ENV{CCACHE_SLOPPINESS})
+			if (NOT "$ENV{CCACHE_SLOPPINESS}" MATCHES "pch_defines" OR NOT "$ENV{CCACHE_SLOPPINESS}" MATCHES "time_macros")
+				set (${_msgVar}
+					"ccache requires the environment variable CCACHE_SLOPPINESS to be set to \"pch_defines,time_macros\"."
+					PARENT_SCOPE)
+			endif()
+		else()
+			if (_launcher MATCHES "ccache")
+				get_filename_component(_ccacheExe "${_launcher}" REALPATH)
+			else()
+				get_filename_component(_ccacheExe "${CMAKE_${_language}_COMPILER}" REALPATH)
+			endif()
+			execute_process(
+				COMMAND "${_ccacheExe}" "--print-config"
+				WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}"
+				RESULT_VARIABLE _result
+				OUTPUT_VARIABLE _ccacheConfig OUTPUT_STRIP_TRAILING_WHITESPACE
+				ERROR_QUIET)
+			if (_result OR NOT
+				_ccacheConfig MATCHES "sloppiness.*=.*time_macros" OR NOT
+				_ccacheConfig MATCHES "sloppiness.*=.*pch_defines")
+				set (${_msgVar}
+					"ccache requires configuration setting \"sloppiness\" to be set to \"pch_defines,time_macros\"."
+					PARENT_SCOPE)
+			endif()
+		endif()
+	endif()
+	if (APPLE)
+		# PCH compilation not supported by GCC / Clang for multi-architecture builds (e.g., i386, x86_64)
+		cotire_get_configuration_types(_configs)
+		foreach (_config ${_configs})
+			set (_targetFlags "")
+			cotire_get_target_compile_flags("${_config}" "${_language}" "${_target}" _targetFlags)
+			cotire_filter_compile_flags("${_language}" "arch" _architectures _ignore ${_targetFlags})
+			list (LENGTH _architectures _numberOfArchitectures)
+			if (_numberOfArchitectures GREATER 1)
+				string (REPLACE ";" ", " _architectureStr "${_architectures}")
+				set (${_msgVar}
+					"Precompiled headers not supported on Darwin for multi-architecture builds (${_architectureStr})."
+					PARENT_SCOPE)
+				break()
+			endif()
+		endforeach()
+	endif()
+endfunction()
+
+macro (cotire_get_intermediate_dir _cotireDir)
+	# ${CMAKE_CFG_INTDIR} may reference a build-time variable when using a generator which supports configuration types
+	get_filename_component(${_cotireDir} "${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/${COTIRE_INTDIR}" ABSOLUTE)
+endmacro()
+
+macro (cotire_setup_file_extension_variables)
+	set (_unityFileExt_C ".c")
+	set (_unityFileExt_CXX ".cxx")
+	set (_prefixFileExt_C ".h")
+	set (_prefixFileExt_CXX ".hxx")
+	set (_prefixSourceFileExt_C ".c")
+	set (_prefixSourceFileExt_CXX ".cxx")
+endmacro()
+
+function (cotire_make_single_unity_source_file_path _language _target _unityFileVar)
+	cotire_setup_file_extension_variables()
+	if (NOT DEFINED _unityFileExt_${_language})
+		set (${_unityFileVar} "" PARENT_SCOPE)
+		return()
+	endif()
+	set (_unityFileBaseName "${_target}_${_language}${COTIRE_UNITY_SOURCE_FILENAME_SUFFIX}")
+	set (_unityFileName "${_unityFileBaseName}${_unityFileExt_${_language}}")
+	cotire_get_intermediate_dir(_baseDir)
+	set (_unityFile "${_baseDir}/${_unityFileName}")
+	set (${_unityFileVar} "${_unityFile}" PARENT_SCOPE)
+endfunction()
+
+function (cotire_make_unity_source_file_paths _language _target _maxIncludes _unityFilesVar)
+	cotire_setup_file_extension_variables()
+	if (NOT DEFINED _unityFileExt_${_language})
+		set (${_unityFileVar} "" PARENT_SCOPE)
+		return()
+	endif()
+	set (_unityFileBaseName "${_target}_${_language}${COTIRE_UNITY_SOURCE_FILENAME_SUFFIX}")
+	cotire_get_intermediate_dir(_baseDir)
+	set (_startIndex 0)
+	set (_index 0)
+	set (_unityFiles "")
+	set (_sourceFiles ${ARGN})
+	foreach (_sourceFile ${_sourceFiles})
+		get_source_file_property(_startNew "${_sourceFile}" COTIRE_START_NEW_UNITY_SOURCE)
+		math (EXPR _unityFileCount "${_index} - ${_startIndex}")
+		if (_startNew OR (_maxIncludes GREATER 0 AND NOT _unityFileCount LESS _maxIncludes))
+			if (_index GREATER 0)
+				# start new unity file segment
+				math (EXPR _endIndex "${_index} - 1")
+				set (_unityFileName "${_unityFileBaseName}_${_startIndex}_${_endIndex}${_unityFileExt_${_language}}")
+				list (APPEND _unityFiles "${_baseDir}/${_unityFileName}")
+			endif()
+			set (_startIndex ${_index})
+		endif()
+		math (EXPR _index "${_index} + 1")
+	endforeach()
+	list (LENGTH _sourceFiles _numberOfSources)
+	if (_startIndex EQUAL 0)
+		# there is only a single unity file
+		cotire_make_single_unity_source_file_path(${_language} ${_target} _unityFiles)
+	elseif (_startIndex LESS _numberOfSources)
+		# end with final unity file segment
+		math (EXPR _endIndex "${_index} - 1")
+		set (_unityFileName "${_unityFileBaseName}_${_startIndex}_${_endIndex}${_unityFileExt_${_language}}")
+		list (APPEND _unityFiles "${_baseDir}/${_unityFileName}")
+	endif()
+	set (${_unityFilesVar} ${_unityFiles} PARENT_SCOPE)
+	if (COTIRE_DEBUG AND _unityFiles)
+		message (STATUS "unity files: ${_unityFiles}")
+	endif()
+endfunction()
+
+function (cotire_unity_to_prefix_file_path _language _target _unityFile _prefixFileVar)
+	cotire_setup_file_extension_variables()
+	if (NOT DEFINED _unityFileExt_${_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_prefix_header_to_source_file_path _language _prefixHeaderFile _prefixSourceFileVar)
+	cotire_setup_file_extension_variables()
+	if (NOT DEFINED _prefixSourceFileExt_${_language})
+		set (${_prefixSourceFileVar} "" PARENT_SCOPE)
+		return()
+	endif()
+	string (REGEX REPLACE "${_prefixFileExt_${_language}}$" "${_prefixSourceFileExt_${_language}}" _prefixSourceFile "${_prefixHeaderFile}")
+	set (${_prefixSourceFileVar} "${_prefixSourceFile}" PARENT_SCOPE)
+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 (CMAKE_${_language}_COMPILER_ID MATCHES "GNU|Clang|Intel|MSVC")
+			cotire_get_intermediate_dir(_baseDir)
+			set (${_prefixFileVar} "${_baseDir}/${_prefixFileName}" PARENT_SCOPE)
+		endif()
+	endif()
+endfunction()
+
+function (cotire_make_pch_file_path _language _target _pchFileVar)
+	cotire_make_prefix_file_name("${_language}" "${_target}" _prefixFileBaseName _prefixFileName)
+	set (${_pchFileVar} "" PARENT_SCOPE)
+	if (_prefixFileBaseName AND _prefixFileName)
+		cotire_check_precompiled_header_support("${_language}" "${_target}" _msg)
+		if (NOT _msg)
+			if (XCODE)
+				# For Xcode, we completely hand off the compilation of the prefix header to the IDE
+				return()
+			endif()
+			cotire_get_intermediate_dir(_baseDir)
+			if (CMAKE_${_language}_COMPILER_ID MATCHES "MSVC")
+				# MSVC uses the extension .pch added to the prefix header base name
+				set (${_pchFileVar} "${_baseDir}/${_prefixFileBaseName}.pch" PARENT_SCOPE)
+			elseif (CMAKE_${_language}_COMPILER_ID MATCHES "Clang")
+				# Clang looks for a precompiled header corresponding to the prefix header with the extension .pch appended
+				set (${_pchFileVar} "${_baseDir}/${_prefixFileName}.pch" PARENT_SCOPE)
+			elseif (CMAKE_${_language}_COMPILER_ID MATCHES "GNU")
+				# GCC looks for a precompiled header corresponding to the prefix header with the extension .gch appended
+				set (${_pchFileVar} "${_baseDir}/${_prefixFileName}.gch" PARENT_SCOPE)
+			elseif (CMAKE_${_language}_COMPILER_ID MATCHES "Intel")
+				# Intel uses the extension .pchi added to the prefix header base name
+				set (${_pchFileVar} "${_baseDir}/${_prefixFileBaseName}.pchi" PARENT_SCOPE)
+			endif()
+		endif()
+	endif()
+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
+	get_target_property(_targetSourceFiles ${_target} SOURCES)
+	cotire_get_objects_with_property_on(_generatedSources GENERATED SOURCE ${_targetSourceFiles})
+	if (_generatedSources)
+		# but omit all generated source files that have the COTIRE_EXCLUDED property set to true
+		cotire_get_objects_with_property_on(_excludedGeneratedSources COTIRE_EXCLUDED SOURCE ${_generatedSources})
+		if (_excludedGeneratedSources)
+			list (REMOVE_ITEM _generatedSources ${_excludedGeneratedSources})
+		endif()
+		# and omit all generated source files that have the COTIRE_DEPENDENCY property set to false explicitly
+		cotire_get_objects_with_property_off(_excludedNonDependencySources COTIRE_DEPENDENCY SOURCE ${_generatedSources})
+		if (_excludedNonDependencySources)
+			list (REMOVE_ITEM _generatedSources ${_excludedNonDependencySources})
+		endif()
+		if (_generatedSources)
+			list (APPEND _dependencySources ${_generatedSources})
+		endif()
+	endif()
+	if (COTIRE_DEBUG AND _dependencySources)
+		message (STATUS "${_language} ${_target} unity source dependencies: ${_dependencySources}")
+	endif()
+	set (${_dependencySourcesVar} ${_dependencySources} PARENT_SCOPE)
+endfunction()
+
+function (cotire_get_prefix_header_dependencies _language _target _dependencySourcesVar)
+	set (_dependencySources "")
+	# depend on target source files marked with custom COTIRE_DEPENDENCY property
+	get_target_property(_targetSourceFiles ${_target} SOURCES)
+	cotire_get_objects_with_property_on(_dependencySources COTIRE_DEPENDENCY SOURCE ${_targetSourceFiles})
+	if (COTIRE_DEBUG AND _dependencySources)
+		message (STATUS "${_language} ${_target} prefix header dependencies: ${_dependencySources}")
+	endif()
+	set (${_dependencySourcesVar} ${_dependencySources} PARENT_SCOPE)
+endfunction()
+
+function (cotire_generate_target_script _language _configurations _target _targetScriptVar _targetConfigScriptVar)
+	set (_targetSources ${ARGN})
+	cotire_get_prefix_header_dependencies(${_language} ${_target} COTIRE_TARGET_PREFIX_DEPENDS ${_targetSources})
+	cotire_get_unity_source_dependencies(${_language} ${_target} COTIRE_TARGET_UNITY_DEPENDS ${_targetSources})
+	# set up variables to be configured
+	set (COTIRE_TARGET_LANGUAGE "${_language}")
+	get_target_property(COTIRE_TARGET_IGNORE_PATH ${_target} COTIRE_PREFIX_HEADER_IGNORE_PATH)
+	cotire_add_sys_root_paths(COTIRE_TARGET_IGNORE_PATH)
+	get_target_property(COTIRE_TARGET_INCLUDE_PATH ${_target} COTIRE_PREFIX_HEADER_INCLUDE_PATH)
+	cotire_add_sys_root_paths(COTIRE_TARGET_INCLUDE_PATH)
+	get_target_property(COTIRE_TARGET_PRE_UNDEFS ${_target} COTIRE_UNITY_SOURCE_PRE_UNDEFS)
+	get_target_property(COTIRE_TARGET_POST_UNDEFS ${_target} COTIRE_UNITY_SOURCE_POST_UNDEFS)
+	get_target_property(COTIRE_TARGET_MAXIMUM_NUMBER_OF_INCLUDES ${_target} COTIRE_UNITY_SOURCE_MAXIMUM_NUMBER_OF_INCLUDES)
+	get_target_property(COTIRE_TARGET_INCLUDE_PRIORITY_PATH ${_target} COTIRE_PREFIX_HEADER_INCLUDE_PRIORITY_PATH)
+	cotire_get_source_files_undefs(COTIRE_UNITY_SOURCE_PRE_UNDEFS COTIRE_TARGET_SOURCES_PRE_UNDEFS ${_targetSources})
+	cotire_get_source_files_undefs(COTIRE_UNITY_SOURCE_POST_UNDEFS COTIRE_TARGET_SOURCES_POST_UNDEFS ${_targetSources})
+	set (COTIRE_TARGET_CONFIGURATION_TYPES "${_configurations}")
+	foreach (_config ${_configurations})
+		string (TOUPPER "${_config}" _upperConfig)
+		cotire_get_target_include_directories(
+			"${_config}" "${_language}" "${_target}" COTIRE_TARGET_INCLUDE_DIRECTORIES_${_upperConfig} COTIRE_TARGET_SYSTEM_INCLUDE_DIRECTORIES_${_upperConfig})
+		cotire_get_target_compile_definitions(
+			"${_config}" "${_language}" "${_target}" COTIRE_TARGET_COMPILE_DEFINITIONS_${_upperConfig})
+		cotire_get_target_compiler_flags(
+			"${_config}" "${_language}" "${_target}" COTIRE_TARGET_COMPILE_FLAGS_${_upperConfig})
+		cotire_get_source_files_compile_definitions(
+			"${_config}" "${_language}" COTIRE_TARGET_SOURCES_COMPILE_DEFINITIONS_${_upperConfig} ${_targetSources})
+	endforeach()
+	get_target_property(COTIRE_TARGET_${_language}_COMPILER_LAUNCHER ${_target} ${_language}_COMPILER_LAUNCHER)
+	# set up COTIRE_TARGET_SOURCES
+	set (COTIRE_TARGET_SOURCES "")
+	foreach (_sourceFile ${_targetSources})
+		get_source_file_property(_generated "${_sourceFile}" GENERATED)
+		if (_generated)
+			# use absolute paths for generated files only, retrieving the LOCATION property is an expensive operation
+			get_source_file_property(_sourceLocation "${_sourceFile}" LOCATION)
+			list (APPEND COTIRE_TARGET_SOURCES "${_sourceLocation}")
+		else()
+			list (APPEND COTIRE_TARGET_SOURCES "${_sourceFile}")
+		endif()
+	endforeach()
+	# copy variable definitions to cotire target script
+	get_cmake_property(_vars VARIABLES)
+	string (REGEX MATCHALL "COTIRE_[A-Za-z0-9_]+" _matchVars "${_vars}")
+	# omit COTIRE_*_INIT variables
+	string (REGEX MATCHALL "COTIRE_[A-Za-z0-9_]+_INIT" _initVars "${_matchVars}")
+	if (_initVars)
+		list (REMOVE_ITEM _matchVars ${_initVars})
+	endif()
+	# omit COTIRE_VERBOSE which is passed as a CMake define on command line
+	list (REMOVE_ITEM _matchVars COTIRE_VERBOSE)
+	set (_contents "")
+	set (_contentsHasGeneratorExpressions FALSE)
+	foreach (_var IN LISTS _matchVars ITEMS
+		XCODE MSVC CMAKE_GENERATOR CMAKE_BUILD_TYPE CMAKE_CONFIGURATION_TYPES
+		CMAKE_${_language}_COMPILER_ID CMAKE_${_language}_COMPILER_VERSION
+		CMAKE_${_language}_COMPILER_LAUNCHER CMAKE_${_language}_COMPILER CMAKE_${_language}_COMPILER_ARG1
+		CMAKE_INCLUDE_FLAG_${_language} CMAKE_INCLUDE_FLAG_${_language}_SEP
+		CMAKE_INCLUDE_SYSTEM_FLAG_${_language}
+		CMAKE_${_language}_FRAMEWORK_SEARCH_FLAG
+		CMAKE_${_language}_SYSTEM_FRAMEWORK_SEARCH_FLAG
+		CMAKE_${_language}_SOURCE_FILE_EXTENSIONS)
+		if (DEFINED ${_var})
+			string (REPLACE "\"" "\\\"" _value "${${_var}}")
+			set (_contents "${_contents}set (${_var} \"${_value}\")\n")
+			if (NOT _contentsHasGeneratorExpressions)
+				if ("${_value}" MATCHES "\\$<.*>")
+					set (_contentsHasGeneratorExpressions TRUE)
+				endif()
+			endif()
+		endif()
+	endforeach()
+	# generate target script file
+	get_filename_component(_moduleName "${COTIRE_CMAKE_MODULE_FILE}" NAME)
+	set (_targetCotireScript "${CMAKE_CURRENT_BINARY_DIR}/${_target}_${_language}_${_moduleName}")
+	cotire_write_file("CMAKE" "${_targetCotireScript}" "${_contents}" FALSE)
+	if (_contentsHasGeneratorExpressions)
+		# use file(GENERATE ...) to expand generator expressions in the target script at CMake generate-time
+		set (_configNameOrNoneGeneratorExpression "$<$<CONFIG:>:None>$<$<NOT:$<CONFIG:>>:$<CONFIGURATION>>")
+		set (_targetCotireConfigScript "${CMAKE_CURRENT_BINARY_DIR}/${_target}_${_language}_${_configNameOrNoneGeneratorExpression}_${_moduleName}")
+		file (GENERATE OUTPUT "${_targetCotireConfigScript}" INPUT "${_targetCotireScript}")
+	else()
+		set (_targetCotireConfigScript "${_targetCotireScript}")
+	endif()
+	set (${_targetScriptVar} "${_targetCotireScript}" PARENT_SCOPE)
+	set (${_targetConfigScriptVar} "${_targetCotireConfigScript}" PARENT_SCOPE)
+endfunction()
+
+function (cotire_setup_pch_file_compilation _language _target _targetScript _prefixFile _pchFile _hostFile)
+	set (_sourceFiles ${ARGN})
+	if (CMAKE_${_language}_COMPILER_ID MATCHES "MSVC|Intel")
+		# for Visual Studio and Intel, we attach the precompiled header compilation to the host file
+		# the remaining files include the precompiled header, see cotire_setup_pch_file_inclusion
+		if (_sourceFiles)
+			set (_flags "")
+			cotire_add_pch_compilation_flags(
+				"${_language}" "${CMAKE_${_language}_COMPILER_ID}" "${CMAKE_${_language}_COMPILER_VERSION}"
+				"${_prefixFile}" "${_pchFile}" "${_hostFile}" _flags)
+			set_property (SOURCE ${_hostFile} APPEND_STRING PROPERTY COMPILE_FLAGS " ${_flags} ")
+			set_property (SOURCE ${_hostFile} APPEND PROPERTY OBJECT_OUTPUTS "${_pchFile}")
+			# make object file generated from host file depend on prefix header
+			set_property (SOURCE ${_hostFile} APPEND PROPERTY OBJECT_DEPENDS "${_prefixFile}")
+			# mark host file as cotired to prevent it from being used in another cotired target
+			set_property (SOURCE ${_hostFile} PROPERTY COTIRE_TARGET "${_target}")
+		endif()
+	elseif ("${CMAKE_GENERATOR}" MATCHES "Make|Ninja")
+		# for makefile based generator, we add a custom command to precompile the prefix header
+		if (_targetScript)
+			cotire_set_cmd_to_prologue(_cmds)
+			list (APPEND _cmds -P "${COTIRE_CMAKE_MODULE_FILE}" "precompile" "${_targetScript}" "${_prefixFile}" "${_pchFile}" "${_hostFile}")
+			if (MSVC_IDE)
+				file (TO_NATIVE_PATH "${_pchFile}" _pchFileLogPath)
+			else()
+				file (RELATIVE_PATH _pchFileLogPath "${CMAKE_BINARY_DIR}" "${_pchFile}")
+			endif()
+			# make precompiled header compilation depend on the actual compiler executable used to force
+			# re-compilation when the compiler executable is updated. This prevents "created by a different GCC executable"
+			# warnings when the precompiled header is included.
+			get_filename_component(_realCompilerExe "${CMAKE_${_language}_COMPILER}" ABSOLUTE)
+			if (COTIRE_DEBUG)
+				message (STATUS "add_custom_command: OUTPUT ${_pchFile} ${_cmds} DEPENDS ${_prefixFile} ${_realCompilerExe} IMPLICIT_DEPENDS ${_language} ${_prefixFile}")
+			endif()
+			set_property (SOURCE "${_pchFile}" PROPERTY GENERATED TRUE)
+			add_custom_command(
+				OUTPUT "${_pchFile}"
+				COMMAND ${_cmds}
+				DEPENDS "${_prefixFile}" "${_realCompilerExe}"
+				IMPLICIT_DEPENDS ${_language} "${_prefixFile}"
+				WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
+				COMMENT "Building ${_language} precompiled header ${_pchFileLogPath}"
+				VERBATIM)
+		endif()
+	endif()
+endfunction()
+
+function (cotire_setup_pch_file_inclusion _language _target _wholeTarget _prefixFile _pchFile _hostFile)
+	if (CMAKE_${_language}_COMPILER_ID MATCHES "MSVC|Intel")
+		# for Visual Studio and Intel, we include the precompiled header in all but the host file
+		# the host file does the precompiled header compilation, see cotire_setup_pch_file_compilation
+		set (_sourceFiles ${ARGN})
+		list (LENGTH _sourceFiles _numberOfSourceFiles)
+		if (_numberOfSourceFiles GREATER 0)
+			# mark sources as cotired to prevent them from being used in another cotired target
+			set_source_files_properties(${_sourceFiles} PROPERTIES COTIRE_TARGET "${_target}")
+			set (_flags "")
+			cotire_add_prefix_pch_inclusion_flags(
+				"${_language}" "${CMAKE_${_language}_COMPILER_ID}" "${CMAKE_${_language}_COMPILER_VERSION}"
+				"${_prefixFile}" "${_pchFile}" _flags)
+			set_property (SOURCE ${_sourceFiles} APPEND_STRING PROPERTY COMPILE_FLAGS " ${_flags} ")
+			# make object files generated from source files depend on precompiled header
+			set_property (SOURCE ${_sourceFiles} APPEND PROPERTY OBJECT_DEPENDS "${_pchFile}")
+		endif()
+	elseif ("${CMAKE_GENERATOR}" MATCHES "Make|Ninja")
+		set (_sourceFiles ${_hostFile} ${ARGN})
+		if (NOT _wholeTarget)
+			# for makefile based generator, we force the inclusion of the prefix header for a subset
+			# of the source files, if this is a multi-language target or has excluded files
+			set (_flags "")
+			cotire_add_prefix_pch_inclusion_flags(
+				"${_language}" "${CMAKE_${_language}_COMPILER_ID}" "${CMAKE_${_language}_COMPILER_VERSION}"
+				"${_prefixFile}" "${_pchFile}" _flags)
+			set_property (SOURCE ${_sourceFiles} APPEND_STRING PROPERTY COMPILE_FLAGS " ${_flags} ")
+			# mark sources as cotired to prevent them from being used in another cotired target
+			set_source_files_properties(${_sourceFiles} PROPERTIES COTIRE_TARGET "${_target}")
+		endif()
+		# make object files generated from source files depend on precompiled header
+		set_property (SOURCE ${_sourceFiles} APPEND PROPERTY OBJECT_DEPENDS "${_pchFile}")
+	endif()
+endfunction()
+
+function (cotire_setup_prefix_file_inclusion _language _target _prefixFile)
+	set (_sourceFiles ${ARGN})
+	# force the inclusion of the prefix header for the given source files
+	set (_flags "")
+	set (_pchFile "")
+	cotire_add_prefix_pch_inclusion_flags(
+		"${_language}" "${CMAKE_${_language}_COMPILER_ID}" "${CMAKE_${_language}_COMPILER_VERSION}"
+		"${_prefixFile}" "${_pchFile}" _flags)
+	set_property (SOURCE ${_sourceFiles} APPEND_STRING PROPERTY COMPILE_FLAGS " ${_flags} ")
+	# mark sources as cotired to prevent them from being used in another cotired target
+	set_source_files_properties(${_sourceFiles} PROPERTIES COTIRE_TARGET "${_target}")
+	# make object files generated from source files depend on prefix header
+	set_property (SOURCE ${_sourceFiles} APPEND PROPERTY OBJECT_DEPENDS "${_prefixFile}")
+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 _targetScript _joinedFile _cmdsVar)
+	set (_files ${ARGN})
+	set (_filesPaths "")
+	foreach (_file ${_files})
+		get_filename_component(_filePath "${_file}" ABSOLUTE)
+		list (APPEND _filesPaths "${_filePath}")
+	endforeach()
+	cotire_set_cmd_to_prologue(_prefixCmd)
+	list (APPEND _prefixCmd -P "${COTIRE_CMAKE_MODULE_FILE}" "combine")
+	if (_targetScript)
+		list (APPEND _prefixCmd "${_targetScript}")
+	endif()
+	list (APPEND _prefixCmd "${_joinedFile}" ${_filesPaths})
+	if (COTIRE_DEBUG)
+		message (STATUS "add_custom_command: OUTPUT ${_joinedFile} COMMAND ${_prefixCmd} DEPENDS ${_files}")
+	endif()
+	set_property (SOURCE "${_joinedFile}" PROPERTY GENERATED TRUE)
+	if (MSVC_IDE)
+		file (TO_NATIVE_PATH "${_joinedFile}" _joinedFileLogPath)
+	else()
+		file (RELATIVE_PATH _joinedFileLogPath "${CMAKE_BINARY_DIR}" "${_joinedFile}")
+	endif()
+	get_filename_component(_joinedFileBaseName "${_joinedFile}" NAME_WE)
+	get_filename_component(_joinedFileExt "${_joinedFile}" EXT)
+	if (_language AND _joinedFileBaseName MATCHES "${COTIRE_UNITY_SOURCE_FILENAME_SUFFIX}$")
+		set (_comment "Generating ${_language} unity source ${_joinedFileLogPath}")
+	elseif (_language AND _joinedFileBaseName MATCHES "${COTIRE_PREFIX_HEADER_FILENAME_SUFFIX}$")
+		if (_joinedFileExt MATCHES "^\\.c")
+			set (_comment "Generating ${_language} prefix source ${_joinedFileLogPath}")
+		else()
+			set (_comment "Generating ${_language} prefix header ${_joinedFileLogPath}")
+		endif()
+	else()
+		set (_comment "Generating ${_joinedFileLogPath}")
+	endif()
+	add_custom_command(
+		OUTPUT "${_joinedFile}"
+		COMMAND ${_prefixCmd}
+		DEPENDS ${_files}
+		COMMENT "${_comment}"
+		WORKING_DIRECTORY "${CMAKE_BINARY_DIR}"
+		VERBATIM)
+	list (APPEND ${_cmdsVar} COMMAND ${_prefixCmd})
+	set (${_cmdsVar} ${${_cmdsVar}} PARENT_SCOPE)
+endfunction()
+
+function (cotire_setup_target_pch_usage _languages _target _wholeTarget)
+	if (XCODE)
+		# for Xcode, we attach a pre-build action to generate the unity sources and prefix headers
+		set (_prefixFiles "")
+		foreach (_language ${_languages})
+			get_property(_prefixFile TARGET ${_target} PROPERTY COTIRE_${_language}_PREFIX_HEADER)
+			if (_prefixFile)
+				list (APPEND _prefixFiles "${_prefixFile}")
+			endif()
+		endforeach()
+		set (_cmds ${ARGN})
+		list (LENGTH _prefixFiles _numberOfPrefixFiles)
+		if (_numberOfPrefixFiles GREATER 1)
+			# we also generate a generic, single prefix header which includes all language specific prefix headers
+			set (_language "")
+			set (_targetScript "")
+			cotire_make_prefix_file_path("${_language}" ${_target} _prefixHeader)
+			cotire_setup_combine_command("${_language}" "${_targetScript}" "${_prefixHeader}" _cmds ${_prefixFiles})
+		else()
+			set (_prefixHeader "${_prefixFiles}")
+		endif()
+		if (COTIRE_DEBUG)
+			message (STATUS "add_custom_command: TARGET ${_target} PRE_BUILD ${_cmds}")
+		endif()
+		# because CMake PRE_BUILD command does not support dependencies,
+		# we check dependencies explicity in cotire script mode when the pre-build action is run
+		add_custom_command(
+			TARGET "${_target}"
+			PRE_BUILD ${_cmds}
+			WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
+			COMMENT "Updating target ${_target} prefix headers"
+			VERBATIM)
+		# make Xcode precompile the generated prefix header with ProcessPCH and ProcessPCH++
+		set_target_properties(${_target} PROPERTIES XCODE_ATTRIBUTE_GCC_PRECOMPILE_PREFIX_HEADER "YES")
+		set_target_properties(${_target} PROPERTIES XCODE_ATTRIBUTE_GCC_PREFIX_HEADER "${_prefixHeader}")
+	elseif ("${CMAKE_GENERATOR}" MATCHES "Make|Ninja")
+		# for makefile based generator, we force inclusion of the prefix header for all target source files
+		# if this is a single-language target without any excluded files
+		if (_wholeTarget)
+			set (_language "${_languages}")
+			# for Visual Studio and Intel, precompiled header inclusion is always done on the source file level
+			# see cotire_setup_pch_file_inclusion
+			if (NOT CMAKE_${_language}_COMPILER_ID MATCHES "MSVC|Intel")
+				get_property(_prefixFile TARGET ${_target} PROPERTY COTIRE_${_language}_PREFIX_HEADER)
+				if (_prefixFile)
+					get_property(_pchFile TARGET ${_target} PROPERTY COTIRE_${_language}_PRECOMPILED_HEADER)
+					set (_options COMPILE_OPTIONS)
+					cotire_add_prefix_pch_inclusion_flags(
+						"${_language}" "${CMAKE_${_language}_COMPILER_ID}" "${CMAKE_${_language}_COMPILER_VERSION}"
+						"${_prefixFile}" "${_pchFile}" _options)
+					set_property(TARGET ${_target} APPEND PROPERTY ${_options})
+				endif()
+			endif()
+		endif()
+	endif()
+endfunction()
+
+function (cotire_setup_unity_generation_commands _language _target _targetScript _targetConfigScript _unityFiles _cmdsVar)
+	set (_dependencySources "")
+	cotire_get_unity_source_dependencies(${_language} ${_target} _dependencySources ${ARGN})
+	foreach (_unityFile ${_unityFiles})
+		set_property (SOURCE "${_unityFile}" PROPERTY GENERATED TRUE)
+		# set up compiled unity source dependencies via OBJECT_DEPENDS
+		# this ensures that missing source files are generated before the unity file is compiled
+		if (COTIRE_DEBUG AND _dependencySources)
+			message (STATUS "${_unityFile} OBJECT_DEPENDS ${_dependencySources}")
+		endif()
+		if (_dependencySources)
+			# the OBJECT_DEPENDS property requires a list of full paths
+			set (_objectDependsPaths "")
+			foreach (_sourceFile ${_dependencySources})
+				get_source_file_property(_sourceLocation "${_sourceFile}" LOCATION)
+				list (APPEND _objectDependsPaths "${_sourceLocation}")
+			endforeach()
+			set_property (SOURCE "${_unityFile}" PROPERTY OBJECT_DEPENDS ${_objectDependsPaths})
+		endif()
+		if (WIN32 AND CMAKE_${_language}_COMPILER_ID MATCHES "MSVC|Intel")
+			# unity file compilation results in potentially huge object file, thus use /bigobj by default unter MSVC and Windows Intel
+			set_property (SOURCE "${_unityFile}" APPEND_STRING PROPERTY COMPILE_FLAGS "/bigobj")
+		endif()
+		cotire_set_cmd_to_prologue(_unityCmd)
+		list (APPEND _unityCmd -P "${COTIRE_CMAKE_MODULE_FILE}" "unity" "${_targetConfigScript}" "${_unityFile}")
+		if (CMAKE_VERSION VERSION_LESS "3.1.0")
+			set (_unityCmdDepends "${_targetScript}")
+		else()
+			# CMake 3.1.0 supports generator expressions in arguments to DEPENDS
+			set (_unityCmdDepends "${_targetConfigScript}")
+		endif()
+		if (MSVC_IDE)
+			file (TO_NATIVE_PATH "${_unityFile}" _unityFileLogPath)
+		else()
+			file (RELATIVE_PATH _unityFileLogPath "${CMAKE_BINARY_DIR}" "${_unityFile}")
+		endif()
+		if (COTIRE_DEBUG)
+			message (STATUS "add_custom_command: OUTPUT ${_unityFile} COMMAND ${_unityCmd} DEPENDS ${_unityCmdDepends}")
+		endif()
+		add_custom_command(
+			OUTPUT "${_unityFile}"
+			COMMAND ${_unityCmd}
+			DEPENDS ${_unityCmdDepends}
+			COMMENT "Generating ${_language} unity source ${_unityFileLogPath}"
+			WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
+			VERBATIM)
+		list (APPEND ${_cmdsVar} COMMAND ${_unityCmd})
+	endforeach()
+	set (${_cmdsVar} ${${_cmdsVar}} PARENT_SCOPE)
+endfunction()
+
+function (cotire_setup_prefix_generation_command _language _target _targetScript _prefixFile _unityFiles _cmdsVar)
+	set (_sourceFiles ${ARGN})
+	set (_dependencySources "")
+	cotire_get_prefix_header_dependencies(${_language} ${_target} _dependencySources ${_sourceFiles})
+	cotire_set_cmd_to_prologue(_prefixCmd)
+	list (APPEND _prefixCmd -P "${COTIRE_CMAKE_MODULE_FILE}" "prefix" "${_targetScript}" "${_prefixFile}" ${_unityFiles})
+	set_property (SOURCE "${_prefixFile}" PROPERTY GENERATED TRUE)
+	# make prefix header generation depend on the actual compiler executable used to force
+	# re-generation when the compiler executable is updated. This prevents "file not found"
+	# errors for compiler version specific system header files.
+	get_filename_component(_realCompilerExe "${CMAKE_${_language}_COMPILER}" ABSOLUTE)
+	if (COTIRE_DEBUG)
+		message (STATUS "add_custom_command: OUTPUT ${_prefixFile} COMMAND ${_prefixCmd} DEPENDS ${_unityFile} ${_dependencySources} ${_realCompilerExe}")
+	endif()
+	if (MSVC_IDE)
+		file (TO_NATIVE_PATH "${_prefixFile}" _prefixFileLogPath)
+	else()
+		file (RELATIVE_PATH _prefixFileLogPath "${CMAKE_BINARY_DIR}" "${_prefixFile}")
+	endif()
+	get_filename_component(_prefixFileExt "${_prefixFile}" EXT)
+	if (_prefixFileExt MATCHES "^\\.c")
+		set (_comment "Generating ${_language} prefix source ${_prefixFileLogPath}")
+	else()
+		set (_comment "Generating ${_language} prefix header ${_prefixFileLogPath}")
+	endif()
+	# prevent pre-processing errors upon generating the prefix header when a target's generated include file does not yet exist
+	# we do not add a file-level dependency for the target's generated files though, because we only want to depend on their existence
+	# thus we make the prefix header generation depend on a custom helper target which triggers the generation of the files
+	set (_preTargetName "${_target}${COTIRE_PCH_TARGET_SUFFIX}_pre")
+	if (TARGET ${_preTargetName})
+		# custom helper target has already been generated while processing a different language
+		list (APPEND _dependencySources ${_preTargetName})
+	else()
+		get_target_property(_targetSourceFiles ${_target} SOURCES)
+		cotire_get_objects_with_property_on(_generatedSources GENERATED SOURCE ${_targetSourceFiles})
+		if (_generatedSources)
+			add_custom_target("${_preTargetName}" DEPENDS ${_generatedSources})
+			cotire_init_target("${_preTargetName}")
+			list (APPEND _dependencySources ${_preTargetName})
+		endif()
+	endif()
+	add_custom_command(
+		OUTPUT "${_prefixFile}" "${_prefixFile}.log"
+		COMMAND ${_prefixCmd}
+		DEPENDS ${_unityFiles} ${_dependencySources} "${_realCompilerExe}"
+		COMMENT "${_comment}"
+		WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
+		VERBATIM)
+	list (APPEND ${_cmdsVar} COMMAND ${_prefixCmd})
+	set (${_cmdsVar} ${${_cmdsVar}} PARENT_SCOPE)
+endfunction()
+
+function (cotire_setup_prefix_generation_from_unity_command _language _target _targetScript _prefixFile _unityFiles _cmdsVar)
+	set (_sourceFiles ${ARGN})
+	if (CMAKE_${_language}_COMPILER_ID MATCHES "GNU|Clang")
+		# GNU and Clang require indirect compilation of the prefix header to make them honor the system_header pragma
+		cotire_prefix_header_to_source_file_path(${_language} "${_prefixFile}" _prefixSourceFile)
+	else()
+		set (_prefixSourceFile "${_prefixFile}")
+	endif()
+	cotire_setup_prefix_generation_command(
+		${_language} ${_target} "${_targetScript}"
+		"${_prefixSourceFile}" "${_unityFiles}" ${_cmdsVar} ${_sourceFiles})
+	if (CMAKE_${_language}_COMPILER_ID MATCHES "GNU|Clang")
+		# set up generation of a prefix source file which includes the prefix header
+		cotire_setup_combine_command(${_language} "${_targetScript}" "${_prefixFile}" _cmds ${_prefixSourceFile})
+	endif()
+	set (${_cmdsVar} ${${_cmdsVar}} PARENT_SCOPE)
+endfunction()
+
+function (cotire_setup_prefix_generation_from_provided_command _language _target _targetScript _prefixFile _cmdsVar)
+	set (_prefixHeaderFiles ${ARGN})
+	if (CMAKE_${_language}_COMPILER_ID MATCHES "GNU|Clang")
+		# GNU and Clang require indirect compilation of the prefix header to make them honor the system_header pragma
+		cotire_prefix_header_to_source_file_path(${_language} "${_prefixFile}" _prefixSourceFile)
+	else()
+		set (_prefixSourceFile "${_prefixFile}")
+	endif()
+	cotire_setup_combine_command(${_language} "${_targetScript}" "${_prefixSourceFile}" _cmds ${_prefixHeaderFiles})
+	if (CMAKE_${_language}_COMPILER_ID MATCHES "GNU|Clang")
+		# set up generation of a prefix source file which includes the prefix header
+		cotire_setup_combine_command(${_language} "${_targetScript}" "${_prefixFile}" _cmds ${_prefixSourceFile})
+	endif()
+	set (${_cmdsVar} ${${_cmdsVar}} PARENT_SCOPE)
+endfunction()
+
+function (cotire_init_cotire_target_properties _target)
+	get_property(_isSet TARGET ${_target} PROPERTY COTIRE_ENABLE_PRECOMPILED_HEADER SET)
+	if (NOT _isSet)
+		set_property(TARGET ${_target} PROPERTY COTIRE_ENABLE_PRECOMPILED_HEADER TRUE)
+	endif()
+	get_property(_isSet TARGET ${_target} PROPERTY COTIRE_ADD_UNITY_BUILD SET)
+	if (NOT _isSet)
+		set_property(TARGET ${_target} PROPERTY COTIRE_ADD_UNITY_BUILD TRUE)
+	endif()
+	get_property(_isSet TARGET ${_target} PROPERTY COTIRE_ADD_CLEAN SET)
+	if (NOT _isSet)
+		set_property(TARGET ${_target} PROPERTY COTIRE_ADD_CLEAN FALSE)
+	endif()
+	get_property(_isSet TARGET ${_target} PROPERTY COTIRE_PREFIX_HEADER_IGNORE_PATH SET)
+	if (NOT _isSet)
+		set_property(TARGET ${_target} PROPERTY COTIRE_PREFIX_HEADER_IGNORE_PATH "${CMAKE_SOURCE_DIR}")
+		cotire_check_is_path_relative_to("${CMAKE_BINARY_DIR}" _isRelative "${CMAKE_SOURCE_DIR}")
+		if (NOT _isRelative)
+			set_property(TARGET ${_target} APPEND PROPERTY COTIRE_PREFIX_HEADER_IGNORE_PATH "${CMAKE_BINARY_DIR}")
+		endif()
+	endif()
+	get_property(_isSet TARGET ${_target} PROPERTY COTIRE_PREFIX_HEADER_INCLUDE_PATH SET)
+	if (NOT _isSet)
+		set_property(TARGET ${_target} PROPERTY COTIRE_PREFIX_HEADER_INCLUDE_PATH "")
+	endif()
+	get_property(_isSet TARGET ${_target} PROPERTY COTIRE_PREFIX_HEADER_INCLUDE_PRIORITY_PATH SET)
+	if (NOT _isSet)
+		set_property(TARGET ${_target} PROPERTY COTIRE_PREFIX_HEADER_INCLUDE_PRIORITY_PATH "")
+	endif()
+	get_property(_isSet TARGET ${_target} PROPERTY COTIRE_UNITY_SOURCE_PRE_UNDEFS SET)
+	if (NOT _isSet)
+		set_property(TARGET ${_target} PROPERTY COTIRE_UNITY_SOURCE_PRE_UNDEFS "")
+	endif()
+	get_property(_isSet TARGET ${_target} PROPERTY COTIRE_UNITY_SOURCE_POST_UNDEFS SET)
+	if (NOT _isSet)
+		set_property(TARGET ${_target} PROPERTY COTIRE_UNITY_SOURCE_POST_UNDEFS "")
+	endif()
+	get_property(_isSet TARGET ${_target} PROPERTY COTIRE_UNITY_LINK_LIBRARIES_INIT SET)
+	if (NOT _isSet)
+		set_property(TARGET ${_target} PROPERTY COTIRE_UNITY_LINK_LIBRARIES_INIT "COPY_UNITY")
+	endif()
+	get_property(_isSet TARGET ${_target} PROPERTY COTIRE_UNITY_SOURCE_MAXIMUM_NUMBER_OF_INCLUDES SET)
+	if (NOT _isSet)
+		if (COTIRE_MAXIMUM_NUMBER_OF_UNITY_INCLUDES)
+			set_property(TARGET ${_target} PROPERTY COTIRE_UNITY_SOURCE_MAXIMUM_NUMBER_OF_INCLUDES "${COTIRE_MAXIMUM_NUMBER_OF_UNITY_INCLUDES}")
+		else()
+			set_property(TARGET ${_target} PROPERTY COTIRE_UNITY_SOURCE_MAXIMUM_NUMBER_OF_INCLUDES "")
+		endif()
+	endif()
+endfunction()
+
+function (cotire_make_target_message _target _languages _disableMsg _targetMsgVar)
+	get_target_property(_targetUsePCH ${_target} COTIRE_ENABLE_PRECOMPILED_HEADER)
+	get_target_property(_targetAddSCU ${_target} COTIRE_ADD_UNITY_BUILD)
+	string (REPLACE ";" " " _languagesStr "${_languages}")
+	math (EXPR _numberOfExcludedFiles "${ARGC} - 4")
+	if (_numberOfExcludedFiles EQUAL 0)
+		set (_excludedStr "")
+	elseif (COTIRE_VERBOSE OR _numberOfExcludedFiles LESS 4)
+		string (REPLACE ";" ", " _excludedStr "excluding ${ARGN}")
+	else()
+		set (_excludedStr "excluding ${_numberOfExcludedFiles} files")
+	endif()
+	set (_targetMsg "")
+	if (NOT _languages)
+		set (_targetMsg "Target ${_target} cannot be cotired.")
+		if (_disableMsg)
+			set (_targetMsg "${_targetMsg} ${_disableMsg}")
+		endif()
+	elseif (NOT _targetUsePCH AND NOT _targetAddSCU)
+		set (_targetMsg "${_languagesStr} target ${_target} cotired without unity build and precompiled header.")
+		if (_disableMsg)
+			set (_targetMsg "${_targetMsg} ${_disableMsg}")
+		endif()
+	elseif (NOT _targetUsePCH)
+		if (_excludedStr)
+			set (_targetMsg "${_languagesStr} target ${_target} cotired without precompiled header ${_excludedStr}.")
+		else()
+			set (_targetMsg "${_languagesStr} target ${_target} cotired without precompiled header.")
+		endif()
+		if (_disableMsg)
+			set (_targetMsg "${_targetMsg} ${_disableMsg}")
+		endif()
+	elseif (NOT _targetAddSCU)
+		if (_excludedStr)
+			set (_targetMsg "${_languagesStr} target ${_target} cotired without unity build ${_excludedStr}.")
+		else()
+			set (_targetMsg "${_languagesStr} target ${_target} cotired without unity build.")
+		endif()
+	else()
+		if (_excludedStr)
+			set (_targetMsg "${_languagesStr} target ${_target} cotired ${_excludedStr}.")
+		else()
+			set (_targetMsg "${_languagesStr} target ${_target} cotired.")
+		endif()
+	endif()
+	set (${_targetMsgVar} "${_targetMsg}" PARENT_SCOPE)
+endfunction()
+
+function (cotire_choose_target_languages _target _targetLanguagesVar _wholeTargetVar)
+	set (_languages ${ARGN})
+	set (_allSourceFiles "")
+	set (_allExcludedSourceFiles "")
+	set (_allCotiredSourceFiles "")
+	set (_targetLanguages "")
+	set (_pchEligibleTargetLanguages "")
+	get_target_property(_targetType ${_target} TYPE)
+	get_target_property(_targetSourceFiles ${_target} SOURCES)
+	get_target_property(_targetUsePCH ${_target} COTIRE_ENABLE_PRECOMPILED_HEADER)
+	get_target_property(_targetAddSCU ${_target} COTIRE_ADD_UNITY_BUILD)
+	set (_disableMsg "")
+	foreach (_language ${_languages})
+		get_target_property(_prefixHeader ${_target} COTIRE_${_language}_PREFIX_HEADER)
+		get_target_property(_unityBuildFile ${_target} COTIRE_${_language}_UNITY_SOURCE)
+		if (_prefixHeader OR _unityBuildFile)
+			message (STATUS "cotire: target ${_target} has already been cotired.")
+			set (${_targetLanguagesVar} "" PARENT_SCOPE)
+			return()
+		endif()
+		if (_targetUsePCH AND "${_language}" MATCHES "^C|CXX$" AND DEFINED CMAKE_${_language}_COMPILER_ID)
+			if (CMAKE_${_language}_COMPILER_ID)
+				cotire_check_precompiled_header_support("${_language}" "${_target}" _disableMsg)
+				if (_disableMsg)
+					set (_targetUsePCH FALSE)
+				endif()
+			endif()
+		endif()
+		set (_sourceFiles "")
+		set (_excludedSources "")
+		set (_cotiredSources "")
+		cotire_filter_language_source_files(${_language} ${_target} _sourceFiles _excludedSources _cotiredSources ${_targetSourceFiles})
+		if (_sourceFiles OR _excludedSources OR _cotiredSources)
+			list (APPEND _targetLanguages ${_language})
+		endif()
+		if (_sourceFiles)
+			list (APPEND _allSourceFiles ${_sourceFiles})
+		endif()
+		list (LENGTH _sourceFiles _numberOfSources)
+		if (NOT _numberOfSources LESS ${COTIRE_MINIMUM_NUMBER_OF_TARGET_SOURCES})
+			list (APPEND _pchEligibleTargetLanguages ${_language})
+		endif()
+		if (_excludedSources)
+			list (APPEND _allExcludedSourceFiles ${_excludedSources})
+		endif()
+		if (_cotiredSources)
+			list (APPEND _allCotiredSourceFiles ${_cotiredSources})
+		endif()
+	endforeach()
+	set (_targetMsgLevel STATUS)
+	if (NOT _targetLanguages)
+		string (REPLACE ";" " or " _languagesStr "${_languages}")
+		set (_disableMsg "No ${_languagesStr} source files.")
+		set (_targetUsePCH FALSE)
+		set (_targetAddSCU FALSE)
+	endif()
+	if (_targetUsePCH)
+		if (_allCotiredSourceFiles)
+			cotire_get_source_file_property_values(_cotireTargets COTIRE_TARGET ${_allCotiredSourceFiles})
+			list (REMOVE_DUPLICATES _cotireTargets)
+			string (REPLACE ";" ", " _cotireTargetsStr "${_cotireTargets}")
+			set (_disableMsg "Target sources already include a precompiled header for target(s) ${_cotireTargets}.")
+			set (_disableMsg "${_disableMsg} Set target property COTIRE_ENABLE_PRECOMPILED_HEADER to FALSE for targets ${_target},")
+			set (_disableMsg "${_disableMsg} ${_cotireTargetsStr} to get a workable build system.")
+			set (_targetMsgLevel SEND_ERROR)
+			set (_targetUsePCH FALSE)
+		elseif (NOT _pchEligibleTargetLanguages)
+			set (_disableMsg "Too few applicable sources.")
+			set (_targetUsePCH FALSE)
+		elseif (XCODE AND _allExcludedSourceFiles)
+			# for Xcode, we cannot apply the precompiled header to individual sources, only to the whole target
+			set (_disableMsg "Exclusion of source files not supported for generator Xcode.")
+			set (_targetUsePCH FALSE)
+		elseif (XCODE AND "${_targetType}" STREQUAL "OBJECT_LIBRARY")
+			# for Xcode, we cannot apply the required PRE_BUILD action to generate the prefix header to an OBJECT_LIBRARY target
+			set (_disableMsg "Required PRE_BUILD action not supported for OBJECT_LIBRARY targets for generator Xcode.")
+			set (_targetUsePCH FALSE)
+		endif()
+	endif()
+	set_property(TARGET ${_target} PROPERTY COTIRE_ENABLE_PRECOMPILED_HEADER ${_targetUsePCH})
+	set_property(TARGET ${_target} PROPERTY COTIRE_ADD_UNITY_BUILD ${_targetAddSCU})
+	cotire_make_target_message(${_target} "${_targetLanguages}" "${_disableMsg}" _targetMsg ${_allExcludedSourceFiles})
+	if (_targetMsg)
+		if (NOT DEFINED COTIREMSG_${_target})
+			set (COTIREMSG_${_target} "")
+		endif()
+		if (COTIRE_VERBOSE OR NOT "${_targetMsgLevel}" STREQUAL "STATUS" OR
+			NOT "${COTIREMSG_${_target}}" STREQUAL "${_targetMsg}")
+			# cache message to avoid redundant messages on re-configure
+			set (COTIREMSG_${_target} "${_targetMsg}" CACHE INTERNAL "${_target} cotire message.")
+			message (${_targetMsgLevel} "${_targetMsg}")
+		endif()
+	endif()
+	list (LENGTH _targetLanguages _numberOfLanguages)
+	if (_numberOfLanguages GREATER 1 OR _allExcludedSourceFiles)
+		set (${_wholeTargetVar} FALSE PARENT_SCOPE)
+	else()
+		set (${_wholeTargetVar} TRUE PARENT_SCOPE)
+	endif()
+	set (${_targetLanguagesVar} ${_targetLanguages} PARENT_SCOPE)
+endfunction()
+
+function (cotire_compute_unity_max_number_of_includes _target _maxIncludesVar)
+	set (_sourceFiles ${ARGN})
+	get_target_property(_maxIncludes ${_target} COTIRE_UNITY_SOURCE_MAXIMUM_NUMBER_OF_INCLUDES)
+	if (_maxIncludes MATCHES "(-j|--parallel|--jobs) ?([0-9]*)")
+		set (_numberOfThreads "${CMAKE_MATCH_2}")
+		if (NOT _numberOfThreads)
+			# use all available cores
+			ProcessorCount(_numberOfThreads)
+		endif()
+		list (LENGTH _sourceFiles _numberOfSources)
+		math (EXPR _maxIncludes "(${_numberOfSources} + ${_numberOfThreads} - 1) / ${_numberOfThreads}")
+	elseif (NOT _maxIncludes MATCHES "[0-9]+")
+		set (_maxIncludes 0)
+	endif()
+	if (COTIRE_DEBUG)
+		message (STATUS "${_target} unity source max includes: ${_maxIncludes}")
+	endif()
+	set (${_maxIncludesVar} ${_maxIncludes} PARENT_SCOPE)
+endfunction()
+
+function (cotire_process_target_language _language _configurations _target _wholeTarget _cmdsVar)
+	set (${_cmdsVar} "" PARENT_SCOPE)
+	get_target_property(_targetSourceFiles ${_target} SOURCES)
+	set (_sourceFiles "")
+	set (_excludedSources "")
+	set (_cotiredSources "")
+	cotire_filter_language_source_files(${_language} ${_target} _sourceFiles _excludedSources _cotiredSources ${_targetSourceFiles})
+	if (NOT _sourceFiles AND NOT _cotiredSources)
+		return()
+	endif()
+	set (_cmds "")
+	# check for user provided unity source file list
+	get_property(_unitySourceFiles TARGET ${_target} PROPERTY COTIRE_${_language}_UNITY_SOURCE_INIT)
+	if (NOT _unitySourceFiles)
+		set (_unitySourceFiles ${_sourceFiles} ${_cotiredSources})
+	endif()
+	cotire_generate_target_script(
+		${_language} "${_configurations}" ${_target} _targetScript _targetConfigScript ${_unitySourceFiles})
+	# set up unity files for parallel compilation
+	cotire_compute_unity_max_number_of_includes(${_target} _maxIncludes ${_unitySourceFiles})
+	cotire_make_unity_source_file_paths(${_language} ${_target} ${_maxIncludes} _unityFiles ${_unitySourceFiles})
+	list (LENGTH _unityFiles _numberOfUnityFiles)
+	if (_numberOfUnityFiles EQUAL 0)
+		return()
+	elseif (_numberOfUnityFiles GREATER 1)
+		cotire_setup_unity_generation_commands(
+			${_language} ${_target} "${_targetScript}" "${_targetConfigScript}" "${_unityFiles}" _cmds ${_unitySourceFiles})
+	endif()
+	# set up single unity file for prefix header generation
+	cotire_make_single_unity_source_file_path(${_language} ${_target} _unityFile)
+	cotire_setup_unity_generation_commands(
+		${_language} ${_target} "${_targetScript}" "${_targetConfigScript}" "${_unityFile}" _cmds ${_unitySourceFiles})
+	cotire_make_prefix_file_path(${_language} ${_target} _prefixFile)
+	# set up prefix header
+	if (_prefixFile)
+		# check for user provided prefix header files
+		get_property(_prefixHeaderFiles TARGET ${_target} PROPERTY COTIRE_${_language}_PREFIX_HEADER_INIT)
+		if (_prefixHeaderFiles)
+			cotire_setup_prefix_generation_from_provided_command(
+				${_language} ${_target} "${_targetConfigScript}" "${_prefixFile}" _cmds ${_prefixHeaderFiles})
+		else()
+			cotire_setup_prefix_generation_from_unity_command(
+				${_language} ${_target} "${_targetConfigScript}" "${_prefixFile}" "${_unityFile}" _cmds ${_unitySourceFiles})
+		endif()
+		# check if selected language has enough sources at all
+		list (LENGTH _sourceFiles _numberOfSources)
+		if (_numberOfSources LESS ${COTIRE_MINIMUM_NUMBER_OF_TARGET_SOURCES})
+			set (_targetUsePCH FALSE)
+		else()
+			get_target_property(_targetUsePCH ${_target} COTIRE_ENABLE_PRECOMPILED_HEADER)
+		endif()
+		if (_targetUsePCH)
+			cotire_make_pch_file_path(${_language} ${_target} _pchFile)
+			if (_pchFile)
+				# first file in _sourceFiles is passed as the host file
+				cotire_setup_pch_file_compilation(
+					${_language} ${_target} "${_targetConfigScript}" "${_prefixFile}" "${_pchFile}" ${_sourceFiles})
+				cotire_setup_pch_file_inclusion(
+					${_language} ${_target} ${_wholeTarget} "${_prefixFile}" "${_pchFile}" ${_sourceFiles})
+			endif()
+		elseif (_prefixHeaderFiles)
+			# user provided prefix header must be included unconditionally
+			cotire_setup_prefix_file_inclusion(${_language} ${_target} "${_prefixFile}" ${_sourceFiles})
+		endif()
+	endif()
+	# mark target as cotired for language
+	set_property(TARGET ${_target} PROPERTY COTIRE_${_language}_UNITY_SOURCE "${_unityFiles}")
+	if (_prefixFile)
+		set_property(TARGET ${_target} PROPERTY COTIRE_${_language}_PREFIX_HEADER "${_prefixFile}")
+		if (_targetUsePCH AND _pchFile)
+			set_property(TARGET ${_target} PROPERTY COTIRE_${_language}_PRECOMPILED_HEADER "${_pchFile}")
+		endif()
+	endif()
+	set (${_cmdsVar} ${_cmds} PARENT_SCOPE)
+endfunction()
+
+function (cotire_setup_clean_target _target)
+	set (_cleanTargetName "${_target}${COTIRE_CLEAN_TARGET_SUFFIX}")
+	if (NOT TARGET "${_cleanTargetName}")
+		cotire_set_cmd_to_prologue(_cmds)
+		get_filename_component(_outputDir "${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}" ABSOLUTE)
+		list (APPEND _cmds -P "${COTIRE_CMAKE_MODULE_FILE}" "cleanup" "${_outputDir}" "${COTIRE_INTDIR}" "${_target}")
+		add_custom_target(${_cleanTargetName}
+			COMMAND ${_cmds}
+			WORKING_DIRECTORY "${CMAKE_BINARY_DIR}"
+			COMMENT "Cleaning up target ${_target} cotire generated files"
+			VERBATIM)
+		cotire_init_target("${_cleanTargetName}")
+	endif()
+endfunction()
+
+function (cotire_setup_pch_target _languages _configurations _target)
+	if ("${CMAKE_GENERATOR}" MATCHES "Make|Ninja")
+		# for makefile based generators, we add a custom target to trigger the generation of the cotire related files
+		set (_dependsFiles "")
+		foreach (_language ${_languages})
+			set (_props COTIRE_${_language}_PREFIX_HEADER COTIRE_${_language}_UNITY_SOURCE)
+			if (NOT CMAKE_${_language}_COMPILER_ID MATCHES "MSVC|Intel")
+				# Visual Studio and Intel only create precompiled header as a side effect
+				list (INSERT _props 0 COTIRE_${_language}_PRECOMPILED_HEADER)
+			endif()
+			cotire_get_first_set_property_value(_dependsFile TARGET ${_target} ${_props})
+			if (_dependsFile)
+				list (APPEND _dependsFiles "${_dependsFile}")
+			endif()
+		endforeach()
+		if (_dependsFiles)
+			set (_pchTargetName "${_target}${COTIRE_PCH_TARGET_SUFFIX}")
+			add_custom_target("${_pchTargetName}" DEPENDS ${_dependsFiles})
+			cotire_init_target("${_pchTargetName}")
+			cotire_add_to_pch_all_target(${_pchTargetName})
+		endif()
+	else()
+		# for other generators, we add the "clean all" target to clean up the precompiled header
+		cotire_setup_clean_all_target()
+	endif()
+endfunction()
+
+function (cotire_filter_object_libraries _target _objectLibrariesVar)
+	set (_objectLibraries "")
+	foreach (_source ${ARGN})
+		if (_source MATCHES "^\\$<TARGET_OBJECTS:.+>$")
+			list (APPEND _objectLibraries "${_source}")
+		endif()
+	endforeach()
+	set (${_objectLibrariesVar} ${_objectLibraries} PARENT_SCOPE)
+endfunction()
+
+function (cotire_collect_unity_target_sources _target _languages _unityTargetSourcesVar)
+	get_target_property(_targetSourceFiles ${_target} SOURCES)
+	set (_unityTargetSources ${_targetSourceFiles})
+	foreach (_language ${_languages})
+		get_property(_unityFiles TARGET ${_target} PROPERTY COTIRE_${_language}_UNITY_SOURCE)
+		if (_unityFiles)
+			# remove source files that are included in the unity source
+			set (_sourceFiles "")
+			set (_excludedSources "")
+			set (_cotiredSources "")
+			cotire_filter_language_source_files(${_language} ${_target} _sourceFiles _excludedSources _cotiredSources ${_targetSourceFiles})
+			if (_sourceFiles OR _cotiredSources)
+				list (REMOVE_ITEM _unityTargetSources ${_sourceFiles} ${_cotiredSources})
+			endif()
+			# add unity source files instead
+			list (APPEND _unityTargetSources ${_unityFiles})
+		endif()
+	endforeach()
+	get_target_property(_linkLibrariesStrategy ${_target} COTIRE_UNITY_LINK_LIBRARIES_INIT)
+	if ("${_linkLibrariesStrategy}" MATCHES "^COPY_UNITY$")
+		cotire_filter_object_libraries(${_target} _objectLibraries ${_targetSourceFiles})
+		if (_objectLibraries)
+			cotire_map_libraries("${_linkLibrariesStrategy}" _unityObjectLibraries ${_objectLibraries})
+			list (REMOVE_ITEM _unityTargetSources ${_objectLibraries})
+			list (APPEND _unityTargetSources ${_unityObjectLibraries})
+		endif()
+	endif()
+	set (${_unityTargetSourcesVar} ${_unityTargetSources} PARENT_SCOPE)
+endfunction()
+
+function (cotire_setup_unity_target_pch_usage _languages _target)
+	foreach (_language ${_languages})
+		get_property(_unityFiles TARGET ${_target} PROPERTY COTIRE_${_language}_UNITY_SOURCE)
+		if (_unityFiles)
+			get_property(_userPrefixFile TARGET ${_target} PROPERTY COTIRE_${_language}_PREFIX_HEADER_INIT)
+			get_property(_prefixFile TARGET ${_target} PROPERTY COTIRE_${_language}_PREFIX_HEADER)
+			if (_userPrefixFile AND _prefixFile)
+				# user provided prefix header must be included unconditionally by unity sources
+				cotire_setup_prefix_file_inclusion(${_language} ${_target} "${_prefixFile}" ${_unityFiles})
+			endif()
+		endif()
+	endforeach()
+endfunction()
+
+function (cotire_setup_unity_build_target _languages _configurations _target)
+	get_target_property(_unityTargetName ${_target} COTIRE_UNITY_TARGET_NAME)
+	if (NOT _unityTargetName)
+		set (_unityTargetName "${_target}${COTIRE_UNITY_BUILD_TARGET_SUFFIX}")
+	endif()
+	# determine unity target sub type
+	get_target_property(_targetType ${_target} TYPE)
+	if ("${_targetType}" STREQUAL "EXECUTABLE")
+		set (_unityTargetSubType "")
+	elseif (_targetType MATCHES "(STATIC|SHARED|MODULE|OBJECT)_LIBRARY")
+		set (_unityTargetSubType "${CMAKE_MATCH_1}")
+	else()
+		message (WARNING "cotire: target ${_target} has unknown target type ${_targetType}.")
+		return()
+	endif()
+	# determine unity target sources
+	set (_unityTargetSources "")
+	cotire_collect_unity_target_sources(${_target} "${_languages}" _unityTargetSources)
+	# handle automatic Qt processing
+	get_target_property(_targetAutoMoc ${_target} AUTOMOC)
+	get_target_property(_targetAutoUic ${_target} AUTOUIC)
+	get_target_property(_targetAutoRcc ${_target} AUTORCC)
+	if (_targetAutoMoc OR _targetAutoUic OR _targetAutoRcc)
+		# if the original target sources are subject to CMake's automatic Qt processing,
+		# also include implicitly generated <targetname>_automoc.cpp file
+		if (CMAKE_VERSION VERSION_LESS "3.8.0")
+			list (APPEND _unityTargetSources "${_target}_automoc.cpp")
+			set_property (SOURCE "${_target}_automoc.cpp" PROPERTY GENERATED TRUE)
+		else()
+			list (APPEND _unityTargetSources "${_target}_autogen/moc_compilation.cpp")
+			set_property (SOURCE "${_target}_autogen/moc_compilation.cpp" PROPERTY GENERATED TRUE)
+		endif()
+	endif()
+	# prevent AUTOMOC, AUTOUIC and AUTORCC properties from being set when the unity target is created
+	set (CMAKE_AUTOMOC OFF)
+	set (CMAKE_AUTOUIC OFF)
+	set (CMAKE_AUTORCC OFF)
+	if (COTIRE_DEBUG)
+		message (STATUS "add target ${_targetType} ${_unityTargetName} ${_unityTargetSubType} EXCLUDE_FROM_ALL ${_unityTargetSources}")
+	endif()
+	# generate unity target
+	if ("${_targetType}" STREQUAL "EXECUTABLE")
+		add_executable(${_unityTargetName} ${_unityTargetSubType} EXCLUDE_FROM_ALL ${_unityTargetSources})
+	else()
+		add_library(${_unityTargetName} ${_unityTargetSubType} EXCLUDE_FROM_ALL ${_unityTargetSources})
+	endif()
+	if ("${CMAKE_GENERATOR}" MATCHES "Visual Studio")
+		# depend on original target's automoc target, if it exists
+		if (TARGET ${_target}_automoc)
+			add_dependencies(${_unityTargetName} ${_target}_automoc)
+		endif()
+	else()
+		if (_targetAutoMoc OR _targetAutoUic OR _targetAutoRcc)
+			# depend on the original target's implicity generated <targetname>_automoc target
+			if (CMAKE_VERSION VERSION_LESS "3.8.0")
+				add_dependencies(${_unityTargetName} ${_target}_automoc)
+			else()
+				add_dependencies(${_unityTargetName} ${_target}_autogen)
+			endif()
+		endif()
+	endif()
+	# copy output location properties
+	set (_outputDirProperties
+		ARCHIVE_OUTPUT_DIRECTORY ARCHIVE_OUTPUT_DIRECTORY_<CONFIG>
+		LIBRARY_OUTPUT_DIRECTORY LIBRARY_OUTPUT_DIRECTORY_<CONFIG>
+		RUNTIME_OUTPUT_DIRECTORY RUNTIME_OUTPUT_DIRECTORY_<CONFIG>)
+	if (COTIRE_UNITY_OUTPUT_DIRECTORY)
+		set (_setDefaultOutputDir TRUE)
+		if (IS_ABSOLUTE "${COTIRE_UNITY_OUTPUT_DIRECTORY}")
+			set (_outputDir "${COTIRE_UNITY_OUTPUT_DIRECTORY}")
+		else()
+			# append relative COTIRE_UNITY_OUTPUT_DIRECTORY to target's actual output directory
+			cotire_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName} ${_outputDirProperties})
+			cotire_resolve_config_properites("${_configurations}" _properties ${_outputDirProperties})
+			foreach (_property ${_properties})
+				get_property(_outputDir TARGET ${_target} PROPERTY ${_property})
+				if (_outputDir)
+					get_filename_component(_outputDir "${_outputDir}/${COTIRE_UNITY_OUTPUT_DIRECTORY}" ABSOLUTE)
+					set_property(TARGET ${_unityTargetName} PROPERTY ${_property} "${_outputDir}")
+					set (_setDefaultOutputDir FALSE)
+				endif()
+			endforeach()
+			if (_setDefaultOutputDir)
+				get_filename_component(_outputDir "${CMAKE_CURRENT_BINARY_DIR}/${COTIRE_UNITY_OUTPUT_DIRECTORY}" ABSOLUTE)
+			endif()
+		endif()
+		if (_setDefaultOutputDir)
+			set_target_properties(${_unityTargetName} PROPERTIES
+				ARCHIVE_OUTPUT_DIRECTORY "${_outputDir}"
+				LIBRARY_OUTPUT_DIRECTORY "${_outputDir}"
+				RUNTIME_OUTPUT_DIRECTORY "${_outputDir}")
+		endif()
+	else()
+		cotire_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName}
+			${_outputDirProperties})
+	endif()
+	# copy output name
+	cotire_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName}
+		ARCHIVE_OUTPUT_NAME ARCHIVE_OUTPUT_NAME_<CONFIG>
+		LIBRARY_OUTPUT_NAME LIBRARY_OUTPUT_NAME_<CONFIG>
+		OUTPUT_NAME OUTPUT_NAME_<CONFIG>
+		RUNTIME_OUTPUT_NAME RUNTIME_OUTPUT_NAME_<CONFIG>
+		PREFIX <CONFIG>_POSTFIX SUFFIX
+		IMPORT_PREFIX IMPORT_SUFFIX)
+	# copy compile stuff
+	cotire_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName}
+		COMPILE_DEFINITIONS COMPILE_DEFINITIONS_<CONFIG>
+		COMPILE_FLAGS COMPILE_OPTIONS
+		Fortran_FORMAT Fortran_MODULE_DIRECTORY
+		INCLUDE_DIRECTORIES
+		INTERPROCEDURAL_OPTIMIZATION INTERPROCEDURAL_OPTIMIZATION_<CONFIG>
+		POSITION_INDEPENDENT_CODE
+		C_COMPILER_LAUNCHER CXX_COMPILER_LAUNCHER
+		C_INCLUDE_WHAT_YOU_USE CXX_INCLUDE_WHAT_YOU_USE
+		C_VISIBILITY_PRESET CXX_VISIBILITY_PRESET VISIBILITY_INLINES_HIDDEN
+		C_CLANG_TIDY CXX_CLANG_TIDY)
+	# copy compile features
+	cotire_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName}
+		C_EXTENSIONS C_STANDARD C_STANDARD_REQUIRED
+		CXX_EXTENSIONS CXX_STANDARD CXX_STANDARD_REQUIRED
+		COMPILE_FEATURES)
+	# copy interface stuff
+	cotire_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName}
+		COMPATIBLE_INTERFACE_BOOL COMPATIBLE_INTERFACE_NUMBER_MAX COMPATIBLE_INTERFACE_NUMBER_MIN
+		COMPATIBLE_INTERFACE_STRING
+		INTERFACE_COMPILE_DEFINITIONS INTERFACE_COMPILE_FEATURES INTERFACE_COMPILE_OPTIONS
+		INTERFACE_INCLUDE_DIRECTORIES INTERFACE_SOURCES
+		INTERFACE_POSITION_INDEPENDENT_CODE INTERFACE_SYSTEM_INCLUDE_DIRECTORIES
+		INTERFACE_AUTOUIC_OPTIONS NO_SYSTEM_FROM_IMPORTED)
+	# copy link stuff
+	cotire_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName}
+		BUILD_WITH_INSTALL_RPATH INSTALL_RPATH INSTALL_RPATH_USE_LINK_PATH SKIP_BUILD_RPATH
+		LINKER_LANGUAGE LINK_DEPENDS LINK_DEPENDS_NO_SHARED
+		LINK_FLAGS LINK_FLAGS_<CONFIG>
+		LINK_INTERFACE_LIBRARIES LINK_INTERFACE_LIBRARIES_<CONFIG>
+		LINK_INTERFACE_MULTIPLICITY LINK_INTERFACE_MULTIPLICITY_<CONFIG>
+		LINK_SEARCH_START_STATIC LINK_SEARCH_END_STATIC
+		STATIC_LIBRARY_FLAGS STATIC_LIBRARY_FLAGS_<CONFIG>
+		NO_SONAME SOVERSION VERSION
+		LINK_WHAT_YOU_USE)
+	# copy cmake stuff
+	cotire_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName}
+		IMPLICIT_DEPENDS_INCLUDE_TRANSFORM RULE_LAUNCH_COMPILE RULE_LAUNCH_CUSTOM RULE_LAUNCH_LINK)
+	# copy Apple platform specific stuff
+	cotire_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName}
+		BUNDLE BUNDLE_EXTENSION FRAMEWORK FRAMEWORK_VERSION INSTALL_NAME_DIR
+		MACOSX_BUNDLE MACOSX_BUNDLE_INFO_PLIST MACOSX_FRAMEWORK_INFO_PLIST MACOSX_RPATH
+		OSX_ARCHITECTURES OSX_ARCHITECTURES_<CONFIG> PRIVATE_HEADER PUBLIC_HEADER RESOURCE XCTEST
+		IOS_INSTALL_COMBINED)
+	# copy Windows platform specific stuff
+	cotire_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName}
+		GNUtoMS
+		COMPILE_PDB_NAME COMPILE_PDB_NAME_<CONFIG>
+		COMPILE_PDB_OUTPUT_DIRECTORY COMPILE_PDB_OUTPUT_DIRECTORY_<CONFIG>
+		PDB_NAME PDB_NAME_<CONFIG> PDB_OUTPUT_DIRECTORY PDB_OUTPUT_DIRECTORY_<CONFIG>
+		VS_DESKTOP_EXTENSIONS_VERSION VS_DOTNET_REFERENCES VS_DOTNET_TARGET_FRAMEWORK_VERSION
+		VS_GLOBAL_KEYWORD VS_GLOBAL_PROJECT_TYPES VS_GLOBAL_ROOTNAMESPACE
+		VS_IOT_EXTENSIONS_VERSION VS_IOT_STARTUP_TASK
+		VS_KEYWORD VS_MOBILE_EXTENSIONS_VERSION
+		VS_SCC_AUXPATH VS_SCC_LOCALPATH VS_SCC_PROJECTNAME VS_SCC_PROVIDER
+		VS_WINDOWS_TARGET_PLATFORM_MIN_VERSION
+		VS_WINRT_COMPONENT VS_WINRT_EXTENSIONS VS_WINRT_REFERENCES
+		WIN32_EXECUTABLE WINDOWS_EXPORT_ALL_SYMBOLS
+		DEPLOYMENT_REMOTE_DIRECTORY VS_CONFIGURATION_TYPE
+		VS_SDK_REFERENCES)
+	# copy Android platform specific stuff
+	cotire_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName}
+		ANDROID_API ANDROID_API_MIN ANDROID_GUI
+		ANDROID_ANT_ADDITIONAL_OPTIONS ANDROID_ARCH ANDROID_ASSETS_DIRECTORIES
+		ANDROID_JAR_DEPENDENCIES ANDROID_JAR_DIRECTORIES ANDROID_JAVA_SOURCE_DIR
+		ANDROID_NATIVE_LIB_DEPENDENCIES ANDROID_NATIVE_LIB_DIRECTORIES
+		ANDROID_PROCESS_MAX ANDROID_PROGUARD ANDROID_PROGUARD_CONFIG_PATH
+		ANDROID_SECURE_PROPS_PATH ANDROID_SKIP_ANT_STEP ANDROID_STL_TYPE)
+	# use output name from original target
+	get_target_property(_targetOutputName ${_unityTargetName} OUTPUT_NAME)
+	if (NOT _targetOutputName)
+		set_property(TARGET ${_unityTargetName} PROPERTY OUTPUT_NAME "${_target}")
+	endif()
+	# use export symbol from original target
+	cotire_get_target_export_symbol("${_target}" _defineSymbol)
+	if (_defineSymbol)
+		set_property(TARGET ${_unityTargetName} PROPERTY DEFINE_SYMBOL "${_defineSymbol}")
+		if ("${_targetType}" STREQUAL "EXECUTABLE")
+			set_property(TARGET ${_unityTargetName} PROPERTY ENABLE_EXPORTS TRUE)
+		endif()
+	endif()
+	cotire_init_target(${_unityTargetName})
+	cotire_add_to_unity_all_target(${_unityTargetName})
+	set_property(TARGET ${_target} PROPERTY COTIRE_UNITY_TARGET_NAME "${_unityTargetName}")
+endfunction(cotire_setup_unity_build_target)
+
+function (cotire_target _target)
+	set(_options "")
+	set(_oneValueArgs "")
+	set(_multiValueArgs LANGUAGES CONFIGURATIONS)
+	cmake_parse_arguments(_option "${_options}" "${_oneValueArgs}" "${_multiValueArgs}" ${ARGN})
+	if (NOT _option_LANGUAGES)
+		get_property (_option_LANGUAGES GLOBAL PROPERTY ENABLED_LANGUAGES)
+	endif()
+	if (NOT _option_CONFIGURATIONS)
+		cotire_get_configuration_types(_option_CONFIGURATIONS)
+	endif()
+	# check if cotire can be applied to target at all
+	cotire_is_target_supported(${_target} _isSupported)
+	if (NOT _isSupported)
+		get_target_property(_imported ${_target} IMPORTED)
+		get_target_property(_targetType ${_target} TYPE)
+		if (_imported)
+			message (WARNING "cotire: imported ${_targetType} target ${_target} cannot be cotired.")
+		else()
+			message (STATUS "cotire: ${_targetType} target ${_target} cannot be cotired.")
+		endif()
+		return()
+	endif()
+	# resolve alias
+	get_target_property(_aliasName ${_target} ALIASED_TARGET)
+	if (_aliasName)
+		if (COTIRE_DEBUG)
+			message (STATUS "${_target} is an alias. Applying cotire to aliased target ${_aliasName} instead.")
+		endif()
+		set (_target ${_aliasName})
+	endif()
+	# check if target needs to be cotired for build type
+	# when using configuration types, the test is performed at build time
+	cotire_init_cotire_target_properties(${_target})
+	if (NOT CMAKE_CONFIGURATION_TYPES)
+		if (CMAKE_BUILD_TYPE)
+			list (FIND _option_CONFIGURATIONS "${CMAKE_BUILD_TYPE}" _index)
+		else()
+			list (FIND _option_CONFIGURATIONS "None" _index)
+		endif()
+		if (_index EQUAL -1)
+			if (COTIRE_DEBUG)
+				message (STATUS "CMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE} not cotired (${_option_CONFIGURATIONS})")
+			endif()
+			return()
+		endif()
+	endif()
+	# when not using configuration types, immediately create cotire intermediate dir
+	if (NOT CMAKE_CONFIGURATION_TYPES)
+		cotire_get_intermediate_dir(_baseDir)
+		file (MAKE_DIRECTORY "${_baseDir}")
+	endif()
+	# choose languages that apply to the target
+	cotire_choose_target_languages("${_target}" _targetLanguages _wholeTarget ${_option_LANGUAGES})
+	if (NOT _targetLanguages)
+		return()
+	endif()
+	set (_cmds "")
+	foreach (_language ${_targetLanguages})
+		cotire_process_target_language("${_language}" "${_option_CONFIGURATIONS}" ${_target} ${_wholeTarget} _cmd)
+		if (_cmd)
+			list (APPEND _cmds ${_cmd})
+		endif()
+	endforeach()
+	get_target_property(_targetAddSCU ${_target} COTIRE_ADD_UNITY_BUILD)
+	if (_targetAddSCU)
+		cotire_setup_unity_build_target("${_targetLanguages}" "${_option_CONFIGURATIONS}" ${_target})
+	endif()
+	get_target_property(_targetUsePCH ${_target} COTIRE_ENABLE_PRECOMPILED_HEADER)
+	if (_targetUsePCH)
+		cotire_setup_target_pch_usage("${_targetLanguages}" ${_target} ${_wholeTarget} ${_cmds})
+		cotire_setup_pch_target("${_targetLanguages}" "${_option_CONFIGURATIONS}" ${_target})
+		if (_targetAddSCU)
+			cotire_setup_unity_target_pch_usage("${_targetLanguages}" ${_target})
+		endif()
+	endif()
+	get_target_property(_targetAddCleanTarget ${_target} COTIRE_ADD_CLEAN)
+	if (_targetAddCleanTarget)
+		cotire_setup_clean_target(${_target})
+	endif()
+endfunction(cotire_target)
+
+function (cotire_map_libraries _strategy _mappedLibrariesVar)
+	set (_mappedLibraries "")
+	foreach (_library ${ARGN})
+		if (_library MATCHES "^\\$<LINK_ONLY:(.+)>$")
+			set (_libraryName "${CMAKE_MATCH_1}")
+			set (_linkOnly TRUE)
+			set (_objectLibrary FALSE)
+		elseif (_library MATCHES "^\\$<TARGET_OBJECTS:(.+)>$")
+			set (_libraryName "${CMAKE_MATCH_1}")
+			set (_linkOnly FALSE)
+			set (_objectLibrary TRUE)
+		else()
+			set (_libraryName "${_library}")
+			set (_linkOnly FALSE)
+			set (_objectLibrary FALSE)
+		endif()
+		if ("${_strategy}" MATCHES "COPY_UNITY")
+			cotire_is_target_supported(${_libraryName} _isSupported)
+			if (_isSupported)
+				# use target's corresponding unity target, if available
+				get_target_property(_libraryUnityTargetName ${_libraryName} COTIRE_UNITY_TARGET_NAME)
+				if (TARGET "${_libraryUnityTargetName}")
+					if (_linkOnly)
+						list (APPEND _mappedLibraries "$<LINK_ONLY:${_libraryUnityTargetName}>")
+					elseif (_objectLibrary)
+						list (APPEND _mappedLibraries "$<TARGET_OBJECTS:${_libraryUnityTargetName}>")
+					else()
+						list (APPEND _mappedLibraries "${_libraryUnityTargetName}")
+					endif()
+				else()
+					list (APPEND _mappedLibraries "${_library}")
+				endif()
+			else()
+				list (APPEND _mappedLibraries "${_library}")
+			endif()
+		else()
+			list (APPEND _mappedLibraries "${_library}")
+		endif()
+	endforeach()
+	list (REMOVE_DUPLICATES _mappedLibraries)
+	set (${_mappedLibrariesVar} ${_mappedLibraries} PARENT_SCOPE)
+endfunction()
+
+function (cotire_target_link_libraries _target)
+	cotire_is_target_supported(${_target} _isSupported)
+	if (NOT _isSupported)
+		return()
+	endif()
+	get_target_property(_unityTargetName ${_target} COTIRE_UNITY_TARGET_NAME)
+	if (TARGET "${_unityTargetName}")
+		get_target_property(_linkLibrariesStrategy ${_target} COTIRE_UNITY_LINK_LIBRARIES_INIT)
+		if (COTIRE_DEBUG)
+			message (STATUS "unity target ${_unityTargetName} link strategy: ${_linkLibrariesStrategy}")
+		endif()
+		if ("${_linkLibrariesStrategy}" MATCHES "^(COPY|COPY_UNITY)$")
+			get_target_property(_linkLibraries ${_target} LINK_LIBRARIES)
+			if (_linkLibraries)
+				cotire_map_libraries("${_linkLibrariesStrategy}" _unityLinkLibraries ${_linkLibraries})
+				set_target_properties(${_unityTargetName} PROPERTIES LINK_LIBRARIES "${_unityLinkLibraries}")
+				if (COTIRE_DEBUG)
+					message (STATUS "unity target ${_unityTargetName} link libraries: ${_unityLinkLibraries}")
+				endif()
+			endif()
+			get_target_property(_interfaceLinkLibraries ${_target} INTERFACE_LINK_LIBRARIES)
+			if (_interfaceLinkLibraries)
+				cotire_map_libraries("${_linkLibrariesStrategy}" _unityLinkInterfaceLibraries ${_interfaceLinkLibraries})
+				set_target_properties(${_unityTargetName} PROPERTIES INTERFACE_LINK_LIBRARIES "${_unityLinkInterfaceLibraries}")
+				if (COTIRE_DEBUG)
+					message (STATUS "unity target ${_unityTargetName} interface link libraries: ${_unityLinkInterfaceLibraries}")
+				endif()
+			endif()
+		endif()
+	endif()
+endfunction(cotire_target_link_libraries)
+
+function (cotire_cleanup _binaryDir _cotireIntermediateDirName _targetName)
+	if (_targetName)
+		file (GLOB_RECURSE _cotireFiles "${_binaryDir}/${_targetName}*.*")
+	else()
+		file (GLOB_RECURSE _cotireFiles "${_binaryDir}/*.*")
+	endif()
+	# filter files in intermediate directory
+	set (_filesToRemove "")
+	foreach (_file ${_cotireFiles})
+		get_filename_component(_dir "${_file}" DIRECTORY)
+		get_filename_component(_dirName "${_dir}" NAME)
+		if ("${_dirName}" STREQUAL "${_cotireIntermediateDirName}")
+			list (APPEND _filesToRemove "${_file}")
+		endif()
+	endforeach()
+	if (_filesToRemove)
+		if (COTIRE_VERBOSE)
+			message (STATUS "cleaning up ${_filesToRemove}")
+		endif()
+		file (REMOVE ${_filesToRemove})
+	endif()
+endfunction()
+
+function (cotire_init_target _targetName)
+	if (COTIRE_TARGETS_FOLDER)
+		set_target_properties(${_targetName} PROPERTIES FOLDER "${COTIRE_TARGETS_FOLDER}")
+	endif()
+	set_target_properties(${_targetName} PROPERTIES EXCLUDE_FROM_ALL TRUE)
+	if (MSVC_IDE)
+		set_target_properties(${_targetName} PROPERTIES EXCLUDE_FROM_DEFAULT_BUILD TRUE)
+	endif()
+endfunction()
+
+function (cotire_add_to_pch_all_target _pchTargetName)
+	set (_targetName "${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("${_targetName}")
+	endif()
+endfunction()
+
+function (cotire)
+	set(_options "")
+	set(_oneValueArgs "")
+	set(_multiValueArgs LANGUAGES CONFIGURATIONS)
+	cmake_parse_arguments(_option "${_options}" "${_oneValueArgs}" "${_multiValueArgs}" ${ARGN})
+	set (_targets ${_option_UNPARSED_ARGUMENTS})
+	foreach (_target ${_targets})
+		if (TARGET ${_target})
+			cotire_target(${_target} LANGUAGES ${_option_LANGUAGES} CONFIGURATIONS ${_option_CONFIGURATIONS})
+		else()
+			message (WARNING "cotire: ${_target} is not a target.")
+		endif()
+	endforeach()
+	foreach (_target ${_targets})
+		if (TARGET ${_target})
+			cotire_target_link_libraries(${_target})
+		endif()
+	endforeach()
+endfunction()
+
+if (CMAKE_SCRIPT_MODE_FILE)
+
+	# cotire is being run in script mode
+	# locate -P on command args
+	set (COTIRE_ARGC -1)
+	foreach (_index RANGE ${CMAKE_ARGC})
+		if (COTIRE_ARGC GREATER -1)
+			set (COTIRE_ARGV${COTIRE_ARGC} "${CMAKE_ARGV${_index}}")
+			math (EXPR COTIRE_ARGC "${COTIRE_ARGC} + 1")
+		elseif ("${CMAKE_ARGV${_index}}" STREQUAL "-P")
+			set (COTIRE_ARGC 0)
+		endif()
+	endforeach()
+
+	# include target script if available
+	if ("${COTIRE_ARGV2}" MATCHES "\\.cmake$")
+		# the included target scripts sets up additional variables relating to the target (e.g., COTIRE_TARGET_SOURCES)
+		include("${COTIRE_ARGV2}")
+	endif()
+
+	if (COTIRE_DEBUG)
+		message (STATUS "${COTIRE_ARGV0} ${COTIRE_ARGV1} ${COTIRE_ARGV2} ${COTIRE_ARGV3} ${COTIRE_ARGV4} ${COTIRE_ARGV5}")
+	endif()
+
+	if (NOT COTIRE_BUILD_TYPE)
+		set (COTIRE_BUILD_TYPE "None")
+	endif()
+	string (TOUPPER "${COTIRE_BUILD_TYPE}" _upperConfig)
+	set (_includeDirs ${COTIRE_TARGET_INCLUDE_DIRECTORIES_${_upperConfig}})
+	set (_systemIncludeDirs ${COTIRE_TARGET_SYSTEM_INCLUDE_DIRECTORIES_${_upperConfig}})
+	set (_compileDefinitions ${COTIRE_TARGET_COMPILE_DEFINITIONS_${_upperConfig}})
+	set (_compileFlags ${COTIRE_TARGET_COMPILE_FLAGS_${_upperConfig}})
+	# check if target has been cotired for actual build type COTIRE_BUILD_TYPE
+	list (FIND COTIRE_TARGET_CONFIGURATION_TYPES "${COTIRE_BUILD_TYPE}" _index)
+	if (_index GREATER -1)
+		set (_sources ${COTIRE_TARGET_SOURCES})
+		set (_sourcesDefinitions ${COTIRE_TARGET_SOURCES_COMPILE_DEFINITIONS_${_upperConfig}})
+	else()
+		if (COTIRE_DEBUG)
+			message (STATUS "COTIRE_BUILD_TYPE=${COTIRE_BUILD_TYPE} not cotired (${COTIRE_TARGET_CONFIGURATION_TYPES})")
+		endif()
+		set (_sources "")
+		set (_sourcesDefinitions "")
+	endif()
+	set (_targetPreUndefs ${COTIRE_TARGET_PRE_UNDEFS})
+	set (_targetPostUndefs ${COTIRE_TARGET_POST_UNDEFS})
+	set (_sourcesPreUndefs ${COTIRE_TARGET_SOURCES_PRE_UNDEFS})
+	set (_sourcesPostUndefs ${COTIRE_TARGET_SOURCES_POST_UNDEFS})
+
+	if ("${COTIRE_ARGV1}" STREQUAL "unity")
+
+		if (XCODE)
+			# executing pre-build action under Xcode, check dependency on target script
+			set (_dependsOption DEPENDS "${COTIRE_ARGV2}")
+		else()
+			# executing custom command, no need to re-check for dependencies
+			set (_dependsOption "")
+		endif()
+
+		cotire_select_unity_source_files("${COTIRE_ARGV3}" _sources ${_sources})
+
+		cotire_generate_unity_source(
+			"${COTIRE_ARGV3}" ${_sources}
+			LANGUAGE "${COTIRE_TARGET_LANGUAGE}"
+			SOURCES_COMPILE_DEFINITIONS ${_sourcesDefinitions}
+			PRE_UNDEFS ${_targetPreUndefs}
+			POST_UNDEFS ${_targetPostUndefs}
+			SOURCES_PRE_UNDEFS ${_sourcesPreUndefs}
+			SOURCES_POST_UNDEFS ${_sourcesPostUndefs}
+			${_dependsOption})
+
+	elseif ("${COTIRE_ARGV1}" STREQUAL "prefix")
+
+		if (XCODE)
+			# executing pre-build action under Xcode, check dependency on unity file and prefix dependencies
+			set (_dependsOption DEPENDS "${COTIRE_ARGV4}" ${COTIRE_TARGET_PREFIX_DEPENDS})
+		else()
+			# executing custom command, no need to re-check for dependencies
+			set (_dependsOption "")
+		endif()
+
+		set (_files "")
+		foreach (_index RANGE 4 ${COTIRE_ARGC})
+			if (COTIRE_ARGV${_index})
+				list (APPEND _files "${COTIRE_ARGV${_index}}")
+			endif()
+		endforeach()
+
+		cotire_generate_prefix_header(
+			"${COTIRE_ARGV3}" ${_files}
+			COMPILER_LAUNCHER "${COTIRE_TARGET_${COTIRE_TARGET_LANGUAGE}_COMPILER_LAUNCHER}"
+			COMPILER_EXECUTABLE "${CMAKE_${COTIRE_TARGET_LANGUAGE}_COMPILER}"
+			COMPILER_ARG1 ${CMAKE_${COTIRE_TARGET_LANGUAGE}_COMPILER_ARG1}
+			COMPILER_ID "${CMAKE_${COTIRE_TARGET_LANGUAGE}_COMPILER_ID}"
+			COMPILER_VERSION "${CMAKE_${COTIRE_TARGET_LANGUAGE}_COMPILER_VERSION}"
+			LANGUAGE "${COTIRE_TARGET_LANGUAGE}"
+			IGNORE_PATH "${COTIRE_TARGET_IGNORE_PATH};${COTIRE_ADDITIONAL_PREFIX_HEADER_IGNORE_PATH}"
+			INCLUDE_PATH ${COTIRE_TARGET_INCLUDE_PATH}
+			IGNORE_EXTENSIONS "${CMAKE_${COTIRE_TARGET_LANGUAGE}_SOURCE_FILE_EXTENSIONS};${COTIRE_ADDITIONAL_PREFIX_HEADER_IGNORE_EXTENSIONS}"
+			INCLUDE_PRIORITY_PATH ${COTIRE_TARGET_INCLUDE_PRIORITY_PATH}
+			INCLUDE_DIRECTORIES ${_includeDirs}
+			SYSTEM_INCLUDE_DIRECTORIES ${_systemIncludeDirs}
+			COMPILE_DEFINITIONS ${_compileDefinitions}
+			COMPILE_FLAGS ${_compileFlags}
+			${_dependsOption})
+
+	elseif ("${COTIRE_ARGV1}" STREQUAL "precompile")
+
+		set (_files "")
+		foreach (_index RANGE 5 ${COTIRE_ARGC})
+			if (COTIRE_ARGV${_index})
+				list (APPEND _files "${COTIRE_ARGV${_index}}")
+			endif()
+		endforeach()
+
+		cotire_precompile_prefix_header(
+			"${COTIRE_ARGV3}" "${COTIRE_ARGV4}" "${COTIRE_ARGV5}"
+			COMPILER_LAUNCHER "${COTIRE_TARGET_${COTIRE_TARGET_LANGUAGE}_COMPILER_LAUNCHER}"
+			COMPILER_EXECUTABLE "${CMAKE_${COTIRE_TARGET_LANGUAGE}_COMPILER}"
+			COMPILER_ARG1 ${CMAKE_${COTIRE_TARGET_LANGUAGE}_COMPILER_ARG1}
+			COMPILER_ID "${CMAKE_${COTIRE_TARGET_LANGUAGE}_COMPILER_ID}"
+			COMPILER_VERSION "${CMAKE_${COTIRE_TARGET_LANGUAGE}_COMPILER_VERSION}"
+			LANGUAGE "${COTIRE_TARGET_LANGUAGE}"
+			INCLUDE_DIRECTORIES ${_includeDirs}
+			SYSTEM_INCLUDE_DIRECTORIES ${_systemIncludeDirs}
+			COMPILE_DEFINITIONS ${_compileDefinitions}
+			COMPILE_FLAGS ${_compileFlags})
+
+	elseif ("${COTIRE_ARGV1}" STREQUAL "combine")
+
+		if (COTIRE_TARGET_LANGUAGE)
+			set (_combinedFile "${COTIRE_ARGV3}")
+			set (_startIndex 4)
+		else()
+			set (_combinedFile "${COTIRE_ARGV2}")
+			set (_startIndex 3)
+		endif()
+		set (_files "")
+		foreach (_index RANGE ${_startIndex} ${COTIRE_ARGC})
+			if (COTIRE_ARGV${_index})
+				list (APPEND _files "${COTIRE_ARGV${_index}}")
+			endif()
+		endforeach()
+
+		if (XCODE)
+			# executing pre-build action under Xcode, check dependency on files to be combined
+			set (_dependsOption DEPENDS ${_files})
+		else()
+			# executing custom command, no need to re-check for dependencies
+			set (_dependsOption "")
+		endif()
+
+		if (COTIRE_TARGET_LANGUAGE)
+			cotire_generate_unity_source(
+				"${_combinedFile}" ${_files}
+				LANGUAGE "${COTIRE_TARGET_LANGUAGE}"
+				${_dependsOption})
+		else()
+			cotire_generate_unity_source("${_combinedFile}" ${_files} ${_dependsOption})
+		endif()
+
+	elseif ("${COTIRE_ARGV1}" STREQUAL "cleanup")
+
+		cotire_cleanup("${COTIRE_ARGV2}" "${COTIRE_ARGV3}" "${COTIRE_ARGV4}")
+
+	else()
+		message (FATAL_ERROR "cotire: unknown command \"${COTIRE_ARGV1}\".")
+	endif()
+
+else()
+
+	# cotire is being run in include mode
+	# set up all variable and property definitions
+
+	if (NOT DEFINED COTIRE_DEBUG_INIT)
+		if (DEFINED COTIRE_DEBUG)
+			set (COTIRE_DEBUG_INIT ${COTIRE_DEBUG})
+		else()
+			set (COTIRE_DEBUG_INIT FALSE)
+		endif()
+	endif()
+	option (COTIRE_DEBUG "Enable cotire debugging output?" ${COTIRE_DEBUG_INIT})
+
+	if (NOT DEFINED COTIRE_VERBOSE_INIT)
+		if (DEFINED COTIRE_VERBOSE)
+			set (COTIRE_VERBOSE_INIT ${COTIRE_VERBOSE})
+		else()
+			set (COTIRE_VERBOSE_INIT FALSE)
+		endif()
+	endif()
+	option (COTIRE_VERBOSE "Enable cotire verbose output?" ${COTIRE_VERBOSE_INIT})
+
+	set (COTIRE_ADDITIONAL_PREFIX_HEADER_IGNORE_EXTENSIONS "inc;inl;ipp" CACHE STRING
+		"Ignore headers with the listed file extensions from the generated prefix header.")
+
+	set (COTIRE_ADDITIONAL_PREFIX_HEADER_IGNORE_PATH "" CACHE STRING
+		"Ignore headers from these directories when generating the prefix header.")
+
+	set (COTIRE_UNITY_SOURCE_EXCLUDE_EXTENSIONS "m;mm" CACHE STRING
+		"Ignore sources with the listed file extensions from the generated unity source.")
+
+	set (COTIRE_MINIMUM_NUMBER_OF_TARGET_SOURCES "3" CACHE STRING
+		"Minimum number of sources in target required to enable use of precompiled header.")
+
+	if (NOT DEFINED COTIRE_MAXIMUM_NUMBER_OF_UNITY_INCLUDES_INIT)
+		if (DEFINED COTIRE_MAXIMUM_NUMBER_OF_UNITY_INCLUDES)
+			set (COTIRE_MAXIMUM_NUMBER_OF_UNITY_INCLUDES_INIT ${COTIRE_MAXIMUM_NUMBER_OF_UNITY_INCLUDES})
+		elseif ("${CMAKE_GENERATOR}" MATCHES "JOM|Ninja|Visual Studio")
+			# enable parallelization for generators that run multiple jobs by default
+			set (COTIRE_MAXIMUM_NUMBER_OF_UNITY_INCLUDES_INIT "-j")
+		else()
+			set (COTIRE_MAXIMUM_NUMBER_OF_UNITY_INCLUDES_INIT "0")
+		endif()
+	endif()
+	set (COTIRE_MAXIMUM_NUMBER_OF_UNITY_INCLUDES "${COTIRE_MAXIMUM_NUMBER_OF_UNITY_INCLUDES_INIT}" CACHE STRING
+		"Maximum number of source files to include in a single unity source file.")
+
+	if (NOT COTIRE_PREFIX_HEADER_FILENAME_SUFFIX)
+		set (COTIRE_PREFIX_HEADER_FILENAME_SUFFIX "_prefix")
+	endif()
+	if (NOT COTIRE_UNITY_SOURCE_FILENAME_SUFFIX)
+		set (COTIRE_UNITY_SOURCE_FILENAME_SUFFIX "_unity")
+	endif()
+	if (NOT COTIRE_INTDIR)
+		set (COTIRE_INTDIR "cotire")
+	endif()
+	if (NOT COTIRE_PCH_ALL_TARGET_NAME)
+		set (COTIRE_PCH_ALL_TARGET_NAME "all_pch")
+	endif()
+	if (NOT COTIRE_UNITY_BUILD_ALL_TARGET_NAME)
+		set (COTIRE_UNITY_BUILD_ALL_TARGET_NAME "all_unity")
+	endif()
+	if (NOT COTIRE_CLEAN_ALL_TARGET_NAME)
+		set (COTIRE_CLEAN_ALL_TARGET_NAME "clean_cotire")
+	endif()
+	if (NOT COTIRE_CLEAN_TARGET_SUFFIX)
+		set (COTIRE_CLEAN_TARGET_SUFFIX "_clean_cotire")
+	endif()
+	if (NOT COTIRE_PCH_TARGET_SUFFIX)
+		set (COTIRE_PCH_TARGET_SUFFIX "_pch")
+	endif()
+	if (MSVC)
+		# MSVC default PCH memory scaling factor of 100 percent (75 MB) is too small for template heavy C++ code
+		# use a bigger default factor of 170 percent (128 MB)
+		if (NOT DEFINED COTIRE_PCH_MEMORY_SCALING_FACTOR)
+			set (COTIRE_PCH_MEMORY_SCALING_FACTOR "170")
+		endif()
+	endif()
+	if (NOT COTIRE_UNITY_BUILD_TARGET_SUFFIX)
+		set (COTIRE_UNITY_BUILD_TARGET_SUFFIX "_unity")
+	endif()
+	if (NOT DEFINED COTIRE_TARGETS_FOLDER)
+		set (COTIRE_TARGETS_FOLDER "cotire")
+	endif()
+	if (NOT DEFINED COTIRE_UNITY_OUTPUT_DIRECTORY)
+		if ("${CMAKE_GENERATOR}" MATCHES "Ninja")
+			# generated Ninja build files do not work if the unity target produces the same output file as the cotired target
+			set (COTIRE_UNITY_OUTPUT_DIRECTORY "unity")
+		else()
+			set (COTIRE_UNITY_OUTPUT_DIRECTORY "")
+		endif()
+	endif()
+
+	# define cotire cache variables
+
+	define_property(
+		CACHED_VARIABLE PROPERTY "COTIRE_ADDITIONAL_PREFIX_HEADER_IGNORE_PATH"
+		BRIEF_DOCS "Ignore headers from these directories when generating the prefix header."
+		FULL_DOCS
+			"The variable can be set to a semicolon separated list of include directories."
+			"If a header file is found in one of these directories or sub-directories, it will be excluded from the generated prefix header."
+			"If not defined, defaults to empty list."
+	)
+
+	define_property(
+		CACHED_VARIABLE PROPERTY "COTIRE_ADDITIONAL_PREFIX_HEADER_IGNORE_EXTENSIONS"
+		BRIEF_DOCS "Ignore includes with the listed file extensions from the generated prefix header."
+		FULL_DOCS
+			"The variable can be set to a semicolon separated list of file extensions."
+			"If a header file extension matches one in the list, it will be excluded from the generated prefix header."
+			"Includes with an extension in CMAKE_<LANG>_SOURCE_FILE_EXTENSIONS are always ignored."
+			"If not defined, defaults to inc;inl;ipp."
+	)
+
+	define_property(
+		CACHED_VARIABLE PROPERTY "COTIRE_UNITY_SOURCE_EXCLUDE_EXTENSIONS"
+		BRIEF_DOCS "Exclude sources with the listed file extensions from the generated unity source."
+		FULL_DOCS
+			"The variable can be set to a semicolon separated list of file extensions."
+			"If a source file extension matches one in the list, it will be excluded from the generated unity source file."
+			"Source files with an extension in CMAKE_<LANG>_IGNORE_EXTENSIONS are always excluded."
+			"If not defined, defaults to m;mm."
+	)
+
+	define_property(
+		CACHED_VARIABLE PROPERTY "COTIRE_MINIMUM_NUMBER_OF_TARGET_SOURCES"
+		BRIEF_DOCS "Minimum number of sources in target required to enable use of precompiled header."
+		FULL_DOCS
+			"The variable can be set to an integer > 0."
+			"If a target contains less than that number of source files, cotire will not enable the use of the precompiled header for the target."
+			"If not defined, defaults to 3."
+	)
+
+	define_property(
+		CACHED_VARIABLE PROPERTY "COTIRE_MAXIMUM_NUMBER_OF_UNITY_INCLUDES"
+		BRIEF_DOCS "Maximum number of source files to include in a single unity source file."
+		FULL_DOCS
+			"This may be set to an integer >= 0."
+			"If 0, cotire will only create a single unity source file."
+			"If a target contains more than that number of source files, cotire will create multiple unity source files for it."
+			"Can be set to \"-j\" to optimize the count of unity source files for the number of available processor cores."
+			"Can be set to \"-j jobs\" to optimize the number of unity source files for the given number of simultaneous jobs."
+			"Is used to initialize the target property COTIRE_UNITY_SOURCE_MAXIMUM_NUMBER_OF_INCLUDES."
+			"Defaults to \"-j\" for the generators Visual Studio, JOM or Ninja. Defaults to 0 otherwise."
+	)
+
+	# define cotire directory properties
+
+	define_property(
+		DIRECTORY PROPERTY "COTIRE_ENABLE_PRECOMPILED_HEADER"
+		BRIEF_DOCS "Modify build command of cotired targets added in this directory to make use of the generated precompiled header."
+		FULL_DOCS
+			"See target property COTIRE_ENABLE_PRECOMPILED_HEADER."
+	)
+
+	define_property(
+		DIRECTORY PROPERTY "COTIRE_ADD_UNITY_BUILD"
+		BRIEF_DOCS "Add a new target that performs a unity build for cotired targets added in this directory."
+		FULL_DOCS
+			"See target property COTIRE_ADD_UNITY_BUILD."
+	)
+
+	define_property(
+		DIRECTORY PROPERTY "COTIRE_ADD_CLEAN"
+		BRIEF_DOCS "Add a new target that cleans all cotire generated files for cotired targets added in this directory."
+		FULL_DOCS
+			"See target property COTIRE_ADD_CLEAN."
+	)
+
+	define_property(
+		DIRECTORY PROPERTY "COTIRE_PREFIX_HEADER_IGNORE_PATH"
+		BRIEF_DOCS "Ignore headers from these directories when generating the prefix header."
+		FULL_DOCS
+			"See target property COTIRE_PREFIX_HEADER_IGNORE_PATH."
+	)
+
+	define_property(
+		DIRECTORY PROPERTY "COTIRE_PREFIX_HEADER_INCLUDE_PATH"
+		BRIEF_DOCS "Honor headers from these directories when generating the prefix header."
+		FULL_DOCS
+			"See target property COTIRE_PREFIX_HEADER_INCLUDE_PATH."
+	)
+
+	define_property(
+		DIRECTORY PROPERTY "COTIRE_PREFIX_HEADER_INCLUDE_PRIORITY_PATH"
+		BRIEF_DOCS "Header paths matching one of these directories are put at the top of the prefix header."
+		FULL_DOCS
+			"See target property COTIRE_PREFIX_HEADER_INCLUDE_PRIORITY_PATH."
+	)
+
+	define_property(
+		DIRECTORY PROPERTY "COTIRE_UNITY_SOURCE_PRE_UNDEFS"
+		BRIEF_DOCS "Preprocessor undefs to place in the generated unity source file before the inclusion of each source file."
+		FULL_DOCS
+			"See target property COTIRE_UNITY_SOURCE_PRE_UNDEFS."
+	)
+
+	define_property(
+		DIRECTORY PROPERTY "COTIRE_UNITY_SOURCE_POST_UNDEFS"
+		BRIEF_DOCS "Preprocessor undefs to place in the generated unity source file after the inclusion of each source file."
+		FULL_DOCS
+			"See target property COTIRE_UNITY_SOURCE_POST_UNDEFS."
+	)
+
+	define_property(
+		DIRECTORY PROPERTY "COTIRE_UNITY_SOURCE_MAXIMUM_NUMBER_OF_INCLUDES"
+		BRIEF_DOCS "Maximum number of source files to include in a single unity source file."
+		FULL_DOCS
+			"See target property COTIRE_UNITY_SOURCE_MAXIMUM_NUMBER_OF_INCLUDES."
+	)
+
+	define_property(
+		DIRECTORY PROPERTY "COTIRE_UNITY_LINK_LIBRARIES_INIT"
+		BRIEF_DOCS "Define strategy for setting up the unity target's link libraries."
+		FULL_DOCS
+			"See target property COTIRE_UNITY_LINK_LIBRARIES_INIT."
+	)
+
+	# define cotire target properties
+
+	define_property(
+		TARGET PROPERTY "COTIRE_ENABLE_PRECOMPILED_HEADER" INHERITED
+		BRIEF_DOCS "Modify this target's build command to make use of the generated precompiled header."
+		FULL_DOCS
+			"If this property is set to TRUE, cotire will modify the build command to make use of the generated precompiled header."
+			"Irrespective of the value of this property, cotire will setup custom commands to generate the unity source and prefix header for the target."
+			"For makefile based generators cotire will also set up a custom target to manually invoke the generation of the precompiled header."
+			"The target name will be set to this target's name with the suffix _pch appended."
+			"Inherited from directory."
+			"Defaults to TRUE."
+	)
+
+	define_property(
+		TARGET PROPERTY "COTIRE_ADD_UNITY_BUILD" INHERITED
+		BRIEF_DOCS "Add a new target that performs a unity build for this target."
+		FULL_DOCS
+			"If this property is set to TRUE, cotire creates a new target of the same type that uses the generated unity source file instead of the target sources."
+			"Most of the relevant target properties will be copied from this target to the new unity build target."
+			"Target dependencies and linked libraries have to be manually set up for the new unity build target."
+			"The unity target name will be set to this target's name with the suffix _unity appended."
+			"Inherited from directory."
+			"Defaults to TRUE."
+	)
+
+	define_property(
+		TARGET PROPERTY "COTIRE_ADD_CLEAN" INHERITED
+		BRIEF_DOCS "Add a new target that cleans all cotire generated files for this target."
+		FULL_DOCS
+			"If this property is set to TRUE, cotire creates a new target that clean all files (unity source, prefix header, precompiled header)."
+			"The clean target name will be set to this target's name with the suffix _clean_cotire appended."
+			"Inherited from directory."
+			"Defaults to FALSE."
+	)
+
+	define_property(
+		TARGET PROPERTY "COTIRE_PREFIX_HEADER_IGNORE_PATH" INHERITED
+		BRIEF_DOCS "Ignore headers from these directories when generating the prefix header."
+		FULL_DOCS
+			"The property can be set to a list of directories."
+			"If a header file is found in one of these directories or sub-directories, it will be excluded from the generated prefix header."
+			"Inherited from directory."
+			"If not set, this property is initialized to \${CMAKE_SOURCE_DIR};\${CMAKE_BINARY_DIR}."
+	)
+
+	define_property(
+		TARGET PROPERTY "COTIRE_PREFIX_HEADER_INCLUDE_PATH" INHERITED
+		BRIEF_DOCS "Honor headers from these directories when generating the prefix header."
+		FULL_DOCS
+			"The property can be set to a list of directories."
+			"If a header file is found in one of these directories or sub-directories, it will be included in the generated prefix header."
+			"If a header file is both selected by COTIRE_PREFIX_HEADER_IGNORE_PATH and COTIRE_PREFIX_HEADER_INCLUDE_PATH,"
+			"the option which yields the closer relative path match wins."
+			"Inherited from directory."
+			"If not set, this property is initialized to the empty list."
+	)
+
+	define_property(
+		TARGET PROPERTY "COTIRE_PREFIX_HEADER_INCLUDE_PRIORITY_PATH" INHERITED
+		BRIEF_DOCS "Header paths matching one of these directories are put at the top of prefix header."
+		FULL_DOCS
+			"The property can be set to a list of directories."
+			"Header file paths matching one of these directories will be inserted at the beginning of the generated prefix header."
+			"Header files are sorted according to the order of the directories in the property."
+			"If not set, this property is initialized to the empty list."
+	)
+
+	define_property(
+		TARGET PROPERTY "COTIRE_UNITY_SOURCE_PRE_UNDEFS" INHERITED
+		BRIEF_DOCS "Preprocessor undefs to place in the generated unity source file before the inclusion of each target source file."
+		FULL_DOCS
+			"This may be set to a semicolon-separated list of preprocessor symbols."
+			"cotire will add corresponding #undef directives to the generated unit source file before each target source file."
+			"Inherited from directory."
+			"Defaults to empty string."
+	)
+
+	define_property(
+		TARGET PROPERTY "COTIRE_UNITY_SOURCE_POST_UNDEFS" INHERITED
+		BRIEF_DOCS "Preprocessor undefs to place in the generated unity source file after the inclusion of each target source file."
+		FULL_DOCS
+			"This may be set to a semicolon-separated list of preprocessor symbols."
+			"cotire will add corresponding #undef directives to the generated unit source file after each target source file."
+			"Inherited from directory."
+			"Defaults to empty string."
+	)
+
+	define_property(
+		TARGET PROPERTY "COTIRE_UNITY_SOURCE_MAXIMUM_NUMBER_OF_INCLUDES" INHERITED
+		BRIEF_DOCS "Maximum number of source files to include in a single unity source file."
+		FULL_DOCS
+			"This may be set to an integer > 0."
+			"If a target contains more than that number of source files, cotire will create multiple unity build files for it."
+			"If not set, cotire will only create a single unity source file."
+			"Inherited from directory."
+			"Defaults to empty."
+	)
+
+	define_property(
+		TARGET PROPERTY "COTIRE_<LANG>_UNITY_SOURCE_INIT"
+		BRIEF_DOCS "User provided unity source file to be used instead of the automatically generated one."
+		FULL_DOCS
+			"If set, cotire will only add the given file(s) to the generated unity source file."
+			"If not set, cotire will add all the target source files to the generated unity source file."
+			"The property can be set to a user provided unity source file."
+			"Defaults to empty."
+	)
+
+	define_property(
+		TARGET PROPERTY "COTIRE_<LANG>_PREFIX_HEADER_INIT"
+		BRIEF_DOCS "User provided prefix header file to be used instead of the automatically generated one."
+		FULL_DOCS
+			"If set, cotire will add the given header file(s) to the generated prefix header file."
+			"If not set, cotire will generate a prefix header by tracking the header files included by the unity source file."
+			"The property can be set to a user provided prefix header file (e.g., stdafx.h)."
+			"Defaults to empty."
+	)
+
+	define_property(
+		TARGET PROPERTY "COTIRE_UNITY_LINK_LIBRARIES_INIT" INHERITED
+		BRIEF_DOCS "Define strategy for setting up unity target's link libraries."
+		FULL_DOCS
+			"If this property is empty or set to NONE, the generated unity target's link libraries have to be set up manually."
+			"If this property is set to COPY, the unity target's link libraries will be copied from this target."
+			"If this property is set to COPY_UNITY, the unity target's link libraries will be copied from this target with considering existing unity targets."
+			"Inherited from directory."
+			"Defaults to empty."
+	)
+
+	define_property(
+		TARGET PROPERTY "COTIRE_<LANG>_UNITY_SOURCE"
+		BRIEF_DOCS "Read-only property. The generated <LANG> unity source file(s)."
+		FULL_DOCS
+			"cotire sets this property to the path of the generated <LANG> single computation unit source file for the target."
+			"Defaults to empty string."
+	)
+
+	define_property(
+		TARGET PROPERTY "COTIRE_<LANG>_PREFIX_HEADER"
+		BRIEF_DOCS "Read-only property. The generated <LANG> prefix header file."
+		FULL_DOCS
+			"cotire sets this property to the full path of the generated <LANG> language prefix header for the target."
+			"Defaults to empty string."
+	)
+
+	define_property(
+		TARGET PROPERTY "COTIRE_<LANG>_PRECOMPILED_HEADER"
+		BRIEF_DOCS "Read-only property. The generated <LANG> precompiled header file."
+		FULL_DOCS
+			"cotire sets this property to the full path of the generated <LANG> language precompiled header binary for the target."
+			"Defaults to empty string."
+	)
+
+	define_property(
+		TARGET PROPERTY "COTIRE_UNITY_TARGET_NAME"
+		BRIEF_DOCS "The name of the generated unity build target corresponding to this target."
+		FULL_DOCS
+			"This property can be set to the desired name of the unity target that will be created by cotire."
+			"If not set, the unity target name will be set to this target's name with the suffix _unity appended."
+			"After this target has been processed by cotire, the property is set to the actual name of the generated unity target."
+			"Defaults to empty string."
+	)
+
+	# define cotire source properties
+
+	define_property(
+		SOURCE PROPERTY "COTIRE_EXCLUDED"
+		BRIEF_DOCS "Do not modify source file's build command."
+		FULL_DOCS
+			"If this property is set to TRUE, the source file's build command will not be modified to make use of the precompiled header."
+			"The source file will also be excluded from the generated unity source file."
+			"Source files that have their COMPILE_FLAGS property set will be excluded by default."
+			"Defaults to FALSE."
+	)
+
+	define_property(
+		SOURCE PROPERTY "COTIRE_DEPENDENCY"
+		BRIEF_DOCS "Add this source file to dependencies of the automatically generated prefix header file."
+		FULL_DOCS
+			"If this property is set to TRUE, the source file is added to dependencies of the generated prefix header file."
+			"If the file is modified, cotire will re-generate the prefix header source upon build."
+			"Defaults to FALSE."
+	)
+
+	define_property(
+		SOURCE PROPERTY "COTIRE_UNITY_SOURCE_PRE_UNDEFS"
+		BRIEF_DOCS "Preprocessor undefs to place in the generated unity source file before the inclusion of this source file."
+		FULL_DOCS
+			"This may be set to a semicolon-separated list of preprocessor symbols."
+			"cotire will add corresponding #undef directives to the generated unit source file before this file is included."
+			"Defaults to empty string."
+	)
+
+	define_property(
+		SOURCE PROPERTY "COTIRE_UNITY_SOURCE_POST_UNDEFS"
+		BRIEF_DOCS "Preprocessor undefs to place in the generated unity source file after the inclusion of this source file."
+		FULL_DOCS
+			"This may be set to a semicolon-separated list of preprocessor symbols."
+			"cotire will add corresponding #undef directives to the generated unit source file after this file is included."
+			"Defaults to empty string."
+	)
+
+	define_property(
+		SOURCE PROPERTY "COTIRE_START_NEW_UNITY_SOURCE"
+		BRIEF_DOCS "Start a new unity source file which includes this source file as the first one."
+		FULL_DOCS
+			"If this property is set to TRUE, cotire will complete the current unity file and start a new one."
+			"The new unity source file will include this source file as the first one."
+			"This property essentially works as a separator for unity source files."
+			"Defaults to FALSE."
+	)
+
+	define_property(
+		SOURCE PROPERTY "COTIRE_TARGET"
+		BRIEF_DOCS "Read-only property. Mark this source file as cotired for the given target."
+		FULL_DOCS
+			"cotire sets this property to the name of target, that the source file's build command has been altered for."
+			"Defaults to empty string."
+	)
+
+	message (STATUS "cotire ${COTIRE_CMAKE_MODULE_VERSION} loaded.")
+
+endif()