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# Function for setting up precompiled headers. Usage:
#
# add_library/executable(target
# pchheader.c pchheader.cpp pchheader.h)
#
# add_precompiled_header(target pchheader.h
# [FORCEINCLUDE]
# [SOURCE_C pchheader.c]
# [SOURCE_CXX pchheader.cpp])
#
# Options:
#
# FORCEINCLUDE: Add compiler flags to automatically include the
# pchheader.h from every source file. Works with both GCC and
# MSVC. This is recommended.
#
# SOURCE_C/CXX: Specifies the .c/.cpp source file that includes
# pchheader.h for generating the pre-compiled header
# output. Defaults to pchheader.c. Only required for MSVC.
#
# Caveats:
#
# * Its not currently possible to use the same precompiled-header in
# more than a single target in the same directory (No way to set
# the source file properties differently for each target).
#
# * MSVC: A source file with the same name as the header must exist
# and be included in the target (E.g. header.cpp). Name of file
# can be changed using the SOURCE_CXX/SOURCE_C options.
#
# License:
#
# Copyright (C) 2009-2017 Lars Christensen <larsch@belunktum.dk>
#
# Permission is hereby granted, free of charge, to any person
# obtaining a copy of this software and associated documentation files
# (the 'Software') 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.
include(CMakeParseArguments)
macro(combine_arguments _variable)
set(_result "")
foreach(_element ${${_variable}})
set(_result "${_result} \"${_element}\"")
endforeach()
string(STRIP "${_result}" _result)
set(${_variable} "${_result}")
endmacro()
function(export_all_flags _filename)
set(_include_directories "$<TARGET_PROPERTY:${_target},INCLUDE_DIRECTORIES>")
set(_compile_definitions "$<TARGET_PROPERTY:${_target},COMPILE_DEFINITIONS>")
set(_compile_flags "$<TARGET_PROPERTY:${_target},COMPILE_FLAGS>")
set(_compile_options "$<TARGET_PROPERTY:${_target},COMPILE_OPTIONS>")
#handle config-specific cxx flags
string(TOUPPER ${CMAKE_BUILD_TYPE} _config)
set(_build_cxx_flags ${CMAKE_CXX_FLAGS_${_config}})
#handle fpie option
get_target_property(_fpie ${_target} POSITION_INDEPENDENT_CODE)
if (_fpie AND CMAKE_POSITION_INDEPENDENT_CODE)
list(APPEND _compile_options ${CMAKE_CXX_COMPILE_OPTIONS_PIC})
endif()
#handle compiler standard (GCC only)
if(CMAKE_COMPILER_IS_GNUCXX)
get_target_property(_cxx_standard ${_target} CXX_STANDARD)
if ((NOT "${_cxx_standard}" STREQUAL NOTFOUND) AND (NOT "${_cxx_standard}" STREQUAL ""))
get_target_property(_cxx_extensions ${_target} CXX_EXTENSIONS)
get_property(_exists TARGET ${_target} PROPERTY CXX_EXTENSIONS SET)
if (NOT _exists OR ${_cxx_extensions})
list(APPEND _compile_options "-std=gnu++${_cxx_standard}")
else()
list(APPEND _compile_options "-std=c++${_cxx_standard}")
endif()
endif()
endif()
set(_include_directories "$<$<BOOL:${_include_directories}>:-I$<JOIN:${_include_directories},\n-I>\n>")
set(_compile_definitions "$<$<BOOL:${_compile_definitions}>:-D$<JOIN:${_compile_definitions},\n-D>\n>")
set(_compile_flags "$<$<BOOL:${_compile_flags}>:$<JOIN:${_compile_flags},\n>\n>")
set(_compile_options "$<$<BOOL:${_compile_options}>:$<JOIN:${_compile_options},\n>\n>")
set(_cxx_flags "$<$<BOOL:${CMAKE_CXX_FLAGS}>:${CMAKE_CXX_FLAGS}\n>$<$<BOOL:${_build_cxx_flags}>:${_build_cxx_flags}\n>")
file(GENERATE OUTPUT "${_filename}" CONTENT "${_compile_definitions}${_include_directories}${_compile_flags}${_compile_options}${_cxx_flags}\n")
endfunction()
function(add_precompiled_header _target _input)
cmake_parse_arguments(_PCH "FORCEINCLUDE" "SOURCE_CXX;SOURCE_C" "" ${ARGN})
get_filename_component(_input_we ${_input} NAME_WE)
get_filename_component(_input_full ${_input} ABSOLUTE)
file(TO_NATIVE_PATH "${_input_full}" _input_fullpath)
if(NOT _PCH_SOURCE_CXX)
set(_PCH_SOURCE_CXX "${_input_we}.cpp")
endif()
if(NOT _PCH_SOURCE_C)
set(_PCH_SOURCE_C "${_input_we}.c")
endif()
if(MSVC)
set(_pch_cxx_pch "${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/cxx_${_input_we}.pch")
set(_pch_c_pch "${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/c_${_input_we}.pch")
get_target_property(sources ${_target} SOURCES)
foreach(_source ${sources})
set(_pch_compile_flags "")
if(_source MATCHES \\.\(cc|cxx|cpp|c\)$)
if(_source MATCHES \\.\(cpp|cxx|cc\)$)
set(_pch_header "${_input}")
set(_pch "${_pch_cxx_pch}")
else()
set(_pch_header "${_input}")
set(_pch "${_pch_c_pch}")
endif()
if(_source STREQUAL "${_PCH_SOURCE_CXX}")
set(_pch_compile_flags "${_pch_compile_flags} \"/Fp${_pch_cxx_pch}\" \"/Yc${_input}\"")
set(_pch_source_cxx_found TRUE)
set_source_files_properties("${_source}" PROPERTIES OBJECT_OUTPUTS "${_pch_cxx_pch}")
elseif(_source STREQUAL "${_PCH_SOURCE_C}")
set(_pch_compile_flags "${_pch_compile_flags} \"/Fp${_pch_c_pch}\" \"/Yc${_input}\"")
set(_pch_source_c_found TRUE)
set_source_files_properties("${_source}" PROPERTIES OBJECT_OUTPUTS "${_pch_c_pch}")
else()
if(_source MATCHES \\.\(cpp|cxx|cc\)$)
set(_pch_compile_flags "${_pch_compile_flags} \"/Fp${_pch_cxx_pch}\" \"/Yu${_input_fullpath}\"")
set(_pch_source_cxx_needed TRUE)
set_source_files_properties("${_source}" PROPERTIES OBJECT_DEPENDS "${_pch_cxx_pch}")
else()
set(_pch_compile_flags "${_pch_compile_flags} \"/Fp${_pch_c_pch}\" \"/Yu${_input_fullpath}\"")
set(_pch_source_c_needed TRUE)
set_source_files_properties("${_source}" PROPERTIES OBJECT_DEPENDS "${_pch_c_pch}")
endif()
if(_PCH_FORCEINCLUDE)
set(_pch_compile_flags "${_pch_compile_flags} /FI${_input_fullpath}")
endif(_PCH_FORCEINCLUDE)
endif()
get_source_file_property(_object_depends "${_source}" OBJECT_DEPENDS)
if(NOT _object_depends)
set(_object_depends)
endif()
if(_PCH_FORCEINCLUDE)
list(APPEND _object_depends "${CMAKE_CURRENT_SOURCE_DIR}/${_pch_header}")
endif()
set_source_files_properties(${_source} PROPERTIES
COMPILE_FLAGS "${_pch_compile_flags}"
OBJECT_DEPENDS "${_object_depends}")
endif()
endforeach()
if(_pch_source_cxx_needed AND NOT _pch_source_cxx_found)
message(FATAL_ERROR "A source file ${_PCH_SOURCE_CXX} for ${_input} is required for MSVC builds. Can be set with the SOURCE_CXX option.")
endif()
if(_pch_source_c_needed AND NOT _pch_source_c_found)
message(FATAL_ERROR "A source file ${_PCH_SOURCE_C} for ${_input} is required for MSVC builds. Can be set with the SOURCE_C option.")
endif()
endif(MSVC)
if(CMAKE_COMPILER_IS_GNUCXX)
get_filename_component(_name ${_input} NAME)
set(_pch_header "${CMAKE_CURRENT_SOURCE_DIR}/${_input}")
set(_pch_binary_dir "${CMAKE_CURRENT_BINARY_DIR}/${_target}_pch")
set(_pchfile "${_pch_binary_dir}/${_input}")
set(_outdir "${CMAKE_CURRENT_BINARY_DIR}/${_target}_pch/${_name}.gch")
file(MAKE_DIRECTORY "${_outdir}")
set(_output_cxx "${_outdir}/.c++")
set(_output_c "${_outdir}/.c")
set(_pch_flags_file "${_pch_binary_dir}/compile_flags.rsp")
export_all_flags("${_pch_flags_file}")
set(_compiler_FLAGS "@${_pch_flags_file}")
add_custom_command(
OUTPUT "${_pchfile}"
COMMAND "${CMAKE_COMMAND}" -E copy "${_pch_header}" "${_pchfile}"
DEPENDS "${_pch_header}"
COMMENT "Updating ${_name}")
add_custom_command(
OUTPUT "${_output_cxx}"
COMMAND "${CMAKE_CXX_COMPILER}" ${_compiler_FLAGS} -x c++-header -o "${_output_cxx}" "${_pchfile}"
DEPENDS "${_pchfile}" "${_pch_flags_file}"
COMMENT "Precompiling ${_name} for ${_target} (C++)")
add_custom_command(
OUTPUT "${_output_c}"
COMMAND "${CMAKE_C_COMPILER}" ${_compiler_FLAGS} -x c-header -o "${_output_c}" "${_pchfile}"
DEPENDS "${_pchfile}" "${_pch_flags_file}"
COMMENT "Precompiling ${_name} for ${_target} (C)")
get_property(_sources TARGET ${_target} PROPERTY SOURCES)
foreach(_source ${_sources})
set(_pch_compile_flags "")
if(_source MATCHES \\.\(cc|cxx|cpp|c\)$)
get_source_file_property(_pch_compile_flags "${_source}" COMPILE_FLAGS)
if(NOT _pch_compile_flags)
set(_pch_compile_flags)
endif()
separate_arguments(_pch_compile_flags)
list(APPEND _pch_compile_flags -Winvalid-pch)
if(_PCH_FORCEINCLUDE)
list(APPEND _pch_compile_flags -include "${_pchfile}")
else(_PCH_FORCEINCLUDE)
list(APPEND _pch_compile_flags "-I${_pch_binary_dir}")
endif(_PCH_FORCEINCLUDE)
get_source_file_property(_object_depends "${_source}" OBJECT_DEPENDS)
if(NOT _object_depends)
set(_object_depends)
endif()
list(APPEND _object_depends "${_pchfile}")
if(_source MATCHES \\.\(cc|cxx|cpp\)$)
list(APPEND _object_depends "${_output_cxx}")
else()
list(APPEND _object_depends "${_output_c}")
endif()
combine_arguments(_pch_compile_flags)
set_source_files_properties(${_source} PROPERTIES
COMPILE_FLAGS "${_pch_compile_flags}"
OBJECT_DEPENDS "${_object_depends}")
endif()
endforeach()
endif(CMAKE_COMPILER_IS_GNUCXX)
endfunction()
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