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+# Function for setting up precompiled headers. Usage:
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+#
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+# add_library/executable(target
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+# pchheader.c pchheader.cpp pchheader.h)
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+#
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+# add_precompiled_header(target pchheader.h
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+# [FORCEINCLUDE]
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+# [SOURCE_C pchheader.c]
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+# [SOURCE_CXX pchheader.cpp])
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+#
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+# Options:
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+#
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+# FORCEINCLUDE: Add compiler flags to automatically include the
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+# pchheader.h from every source file. Works with both GCC and
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+# MSVC. This is recommended.
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+#
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+# SOURCE_C/CXX: Specifies the .c/.cpp source file that includes
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+# pchheader.h for generating the pre-compiled header
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+# output. Defaults to pchheader.c. Only required for MSVC.
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+#
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+# Caveats:
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+#
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+# * Its not currently possible to use the same precompiled-header in
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+# more than a single target in the same directory (No way to set
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+# the source file properties differently for each target).
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+#
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+# * MSVC: A source file with the same name as the header must exist
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+# and be included in the target (E.g. header.cpp). Name of file
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+# can be changed using the SOURCE_CXX/SOURCE_C options.
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+#
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+# License:
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+#
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+# Copyright (C) 2009-2017 Lars Christensen <larsch@belunktum.dk>
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+#
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+# Permission is hereby granted, free of charge, to any person
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+# obtaining a copy of this software and associated documentation files
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+# (the 'Software') deal in the Software without restriction,
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+# including without limitation the rights to use, copy, modify, merge,
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+# publish, distribute, sublicense, and/or sell copies of the Software,
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+# and to permit persons to whom the Software is furnished to do so,
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+# subject to the following conditions:
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+#
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+# The above copyright notice and this permission notice shall be
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+# included in all copies or substantial portions of the Software.
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+#
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+# THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
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+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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+# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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+# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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+# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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+# SOFTWARE.
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+
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+include(CMakeParseArguments)
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+
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+macro(combine_arguments _variable)
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+ set(_result "")
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+ foreach(_element ${${_variable}})
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+ set(_result "${_result} \"${_element}\"")
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+ endforeach()
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+ string(STRIP "${_result}" _result)
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+ set(${_variable} "${_result}")
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+endmacro()
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+
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+function(export_all_flags _filename)
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+ set(_include_directories "$<TARGET_PROPERTY:${_target},INCLUDE_DIRECTORIES>")
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+ set(_compile_definitions "$<TARGET_PROPERTY:${_target},COMPILE_DEFINITIONS>")
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+ set(_compile_flags "$<TARGET_PROPERTY:${_target},COMPILE_FLAGS>")
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+ set(_compile_options "$<TARGET_PROPERTY:${_target},COMPILE_OPTIONS>")
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+ set(_include_directories "$<$<BOOL:${_include_directories}>:-I$<JOIN:${_include_directories},\n-I>\n>")
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+ set(_compile_definitions "$<$<BOOL:${_compile_definitions}>:-D$<JOIN:${_compile_definitions},\n-D>\n>")
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+ set(_compile_flags "$<$<BOOL:${_compile_flags}>:$<JOIN:${_compile_flags},\n>\n>")
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+ set(_compile_options "$<$<BOOL:${_compile_options}>:$<JOIN:${_compile_options},\n>\n>")
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+ file(GENERATE OUTPUT "${_filename}" CONTENT "${_compile_definitions}${_include_directories}${_compile_flags}${_compile_options}\n")
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+endfunction()
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+
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+function(add_precompiled_header _target _input)
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+ cmake_parse_arguments(_PCH "FORCEINCLUDE" "SOURCE_CXX;SOURCE_C" "" ${ARGN})
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+
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+ get_filename_component(_input_we ${_input} NAME_WE)
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+ if(NOT _PCH_SOURCE_CXX)
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+ set(_PCH_SOURCE_CXX "${_input_we}.cpp")
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+ endif()
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+ if(NOT _PCH_SOURCE_C)
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+ set(_PCH_SOURCE_C "${_input_we}.c")
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+ endif()
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+
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+ if(MSVC)
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+ set(_pch_cxx_pch "${CMAKE_CFG_INTDIR}/cxx_${_input_we}.pch")
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+ set(_pch_c_pch "${CMAKE_CFG_INTDIR}/c_${_input_we}.pch")
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+
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+ get_target_property(sources ${_target} SOURCES)
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+ foreach(_source ${sources})
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+ set(_pch_compile_flags "")
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+ if(_source MATCHES \\.\(cc|cxx|cpp|c\)$)
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+ if(_source MATCHES \\.\(cpp|cxx|cc\)$)
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+ set(_pch_header "${_input}")
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+ set(_pch "${_pch_cxx_pch}")
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+ else()
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+ set(_pch_header "${_input}")
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+ set(_pch "${_pch_c_pch}")
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+ endif()
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+
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+ if(_source STREQUAL "${_PCH_SOURCE_CXX}")
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+ set(_pch_compile_flags "${_pch_compile_flags} \"/Fp${_pch_cxx_pch}\" \"/Yc${_input}\"")
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+ set(_pch_source_cxx_found TRUE)
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+ set_source_files_properties("${_source}" PROPERTIES OBJECT_OUTPUTS "${_pch_cxx_pch}")
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+ elseif(_source STREQUAL "${_PCH_SOURCE_C}")
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+ set(_pch_compile_flags "${_pch_compile_flags} \"/Fp${_pch_c_pch}\" \"/Yc${_input}\"")
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+ set(_pch_source_c_found TRUE)
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+ set_source_files_properties("${_source}" PROPERTIES OBJECT_OUTPUTS "${_pch_c_pch}")
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+ else()
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+ if(_source MATCHES \\.\(cpp|cxx|cc\)$)
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+ set(_pch_compile_flags "${_pch_compile_flags} \"/Fp${_pch_cxx_pch}\" \"/Yu${_input}\"")
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+ set(_pch_source_cxx_needed TRUE)
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+ set_source_files_properties("${_source}" PROPERTIES OBJECT_DEPENDS "${_pch_cxx_pch}")
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+ else()
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+ set(_pch_compile_flags "${_pch_compile_flags} \"/Fp${_pch_c_pch}\" \"/Yu${_input}\"")
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+ set(_pch_source_c_needed TRUE)
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+ set_source_files_properties("${_source}" PROPERTIES OBJECT_DEPENDS "${_pch_c_pch}")
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+ endif()
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+ if(_PCH_FORCEINCLUDE)
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+ set(_pch_compile_flags "${_pch_compile_flags} /FI${_input}")
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+ endif(_PCH_FORCEINCLUDE)
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+ endif()
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+
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+ get_source_file_property(_object_depends "${_source}" OBJECT_DEPENDS)
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+ if(NOT _object_depends)
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+ set(_object_depends)
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+ endif()
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+ if(_PCH_FORCEINCLUDE)
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+ list(APPEND _object_depends "${CMAKE_CURRENT_SOURCE_DIR}/${_pch_header}")
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+ endif()
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+
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+ set_source_files_properties(${_source} PROPERTIES
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+ COMPILE_FLAGS "${_pch_compile_flags}"
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+ OBJECT_DEPENDS "${_object_depends}")
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+ endif()
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+ endforeach()
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+
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+ if(_pch_source_cxx_needed AND NOT _pch_source_cxx_found)
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+ message(FATAL_ERROR "A source file ${_PCH_SOURCE_CXX} for ${_input} is required for MSVC builds. Can be set with the SOURCE_CXX option.")
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+ endif()
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+ if(_pch_source_c_needed AND NOT _pch_source_c_found)
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+ message(FATAL_ERROR "A source file ${_PCH_SOURCE_C} for ${_input} is required for MSVC builds. Can be set with the SOURCE_C option.")
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+ endif()
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+ endif(MSVC)
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+
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+ if(CMAKE_COMPILER_IS_GNUCXX)
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+ get_filename_component(_name ${_input} NAME)
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+ set(_pch_header "${CMAKE_CURRENT_SOURCE_DIR}/${_input}")
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+ set(_pch_binary_dir "${CMAKE_CURRENT_BINARY_DIR}/${_target}_pch")
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+ set(_pchfile "${_pch_binary_dir}/${_input}")
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+ set(_outdir "${CMAKE_CURRENT_BINARY_DIR}/${_target}_pch/${_name}.gch")
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+ file(MAKE_DIRECTORY "${_outdir}")
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+ set(_output_cxx "${_outdir}/.c++")
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+ set(_output_c "${_outdir}/.c")
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+
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+ set(_pch_flags_file "${_pch_binary_dir}/compile_flags.rsp")
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+ export_all_flags("${_pch_flags_file}")
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+ set(_compiler_FLAGS "@${_pch_flags_file}")
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+ add_custom_command(
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+ OUTPUT "${_pchfile}"
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+ COMMAND "${CMAKE_COMMAND}" -E copy "${_pch_header}" "${_pchfile}"
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+ DEPENDS "${_pch_header}"
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+ COMMENT "Updating ${_name}")
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+ add_custom_command(
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+ OUTPUT "${_output_cxx}"
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+ COMMAND "${CMAKE_CXX_COMPILER}" ${_compiler_FLAGS} -x c++-header -o "${_output_cxx}" "${_pchfile}"
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+ DEPENDS "${_pchfile}" "${_pch_flags_file}"
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+ COMMENT "Precompiling ${_name} for ${_target} (C++)")
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+ add_custom_command(
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+ OUTPUT "${_output_c}"
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+ COMMAND "${CMAKE_C_COMPILER}" ${_compiler_FLAGS} -x c-header -o "${_output_c}" "${_pchfile}"
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+ DEPENDS "${_pchfile}" "${_pch_flags_file}"
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+ COMMENT "Precompiling ${_name} for ${_target} (C)")
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+
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+ get_property(_sources TARGET ${_target} PROPERTY SOURCES)
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+ foreach(_source ${_sources})
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+ set(_pch_compile_flags "")
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+
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+ if(_source MATCHES \\.\(cc|cxx|cpp|c\)$)
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+ get_source_file_property(_pch_compile_flags "${_source}" COMPILE_FLAGS)
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+ if(NOT _pch_compile_flags)
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+ set(_pch_compile_flags)
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+ endif()
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+ separate_arguments(_pch_compile_flags)
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+ list(APPEND _pch_compile_flags -Winvalid-pch)
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+ if(_PCH_FORCEINCLUDE)
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+ list(APPEND _pch_compile_flags -include "${_pchfile}")
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+ else(_PCH_FORCEINCLUDE)
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+ list(APPEND _pch_compile_flags "-I${_pch_binary_dir}")
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+ endif(_PCH_FORCEINCLUDE)
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+
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+ get_source_file_property(_object_depends "${_source}" OBJECT_DEPENDS)
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+ if(NOT _object_depends)
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+ set(_object_depends)
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+ endif()
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+ list(APPEND _object_depends "${_pchfile}")
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+ if(_source MATCHES \\.\(cc|cxx|cpp\)$)
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+ list(APPEND _object_depends "${_output_cxx}")
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+ else()
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+ list(APPEND _object_depends "${_output_c}")
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+ endif()
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+
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+ combine_arguments(_pch_compile_flags)
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+ set_source_files_properties(${_source} PROPERTIES
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+ COMPILE_FLAGS "${_pch_compile_flags}"
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+ OBJECT_DEPENDS "${_object_depends}")
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+ endif()
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+ endforeach()
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+ endif(CMAKE_COMPILER_IS_GNUCXX)
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+endfunction()
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gifur