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opencv/cmake/OpenCVPCHSupport.cmake
Csaba Keszegh 2aa18ca3e9 fix: use CXX_STANDARD when extracting compiler flags for PCH with GNUCXX 
When compiling with cmake using -DCMAKE_CXX_STANDARD=11 use `-std=gnu++11`
for PCH compiler flags, otherwise it triggers an error:

   opencv_core_Release.gch: not used because `__cplusplus' defined as ` 201103L' not ` 199711L' [-Winvalid-pch]

Use CXX_EXTENSIONS property to select `gnu++11` or `c++11`.
Trying to mimic cmake logic here: https://gitlab.kitware.com/cmake/cmake/blob/master/Source/cmLocalGenerator.cxx#L1527-1557
2018-01-16 20:32:21 +01:00

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# taken from http://public.kitware.com/Bug/view.php?id=1260 and slightly adjusted
# - Try to find precompiled headers support for GCC 3.4 and 4.x
# Once done this will define:
#
# Variable:
# PCHSupport_FOUND
#
# Macro:
# ADD_PRECOMPILED_HEADER _targetName _input _dowarn
# ADD_PRECOMPILED_HEADER_TO_TARGET _targetName _input _pch_output_to_use _dowarn
# ADD_NATIVE_PRECOMPILED_HEADER _targetName _input _dowarn
# GET_NATIVE_PRECOMPILED_HEADER _targetName _input
IF(CMAKE_COMPILER_IS_GNUCXX)
IF(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS "4.2.0")
SET(PCHSupport_FOUND TRUE)
ENDIF()
SET(_PCH_include_prefix "-I")
SET(_PCH_isystem_prefix "-isystem")
SET(_PCH_define_prefix "-D")
ELSEIF(CMAKE_GENERATOR MATCHES "^Visual.*$")
SET(PCHSupport_FOUND TRUE)
SET(_PCH_include_prefix "/I")
SET(_PCH_isystem_prefix "/I")
SET(_PCH_define_prefix "/D")
ELSE()
SET(PCHSupport_FOUND FALSE)
ENDIF()
MACRO(_PCH_GET_COMPILE_FLAGS _out_compile_flags)
STRING(TOUPPER "CMAKE_CXX_FLAGS_${CMAKE_BUILD_TYPE}" _flags_var_name)
SET(${_out_compile_flags} ${${_flags_var_name}} )
IF(CMAKE_COMPILER_IS_GNUCXX)
GET_TARGET_PROPERTY(_targetType ${_PCH_current_target} TYPE)
IF(${_targetType} STREQUAL SHARED_LIBRARY AND NOT WIN32)
LIST(APPEND ${_out_compile_flags} "-fPIC")
ENDIF()
GET_PROPERTY(_definitions DIRECTORY PROPERTY COMPILE_DEFINITIONS)
if(_definitions)
foreach(_def ${_definitions})
LIST(APPEND ${_out_compile_flags} "\"-D${_def}\"")
endforeach()
endif()
GET_TARGET_PROPERTY(_target_definitions ${_PCH_current_target} COMPILE_DEFINITIONS)
if(_target_definitions)
foreach(_def ${_target_definitions})
LIST(APPEND ${_out_compile_flags} "\"-D${_def}\"")
endforeach()
endif()
GET_TARGET_PROPERTY(_cxx_standard ${_PCH_current_target} CXX_STANDARD)
if (_cxx_standard)
GET_TARGET_PROPERTY(_cxx_extensions ${_PCH_current_target} CXX_EXTENSIONS)
if (_cxx_extensions)
LIST(APPEND ${_out_compile_flags} "${CMAKE_CXX${_cxx_standard}_EXTENSION_COMPILE_OPTION}")
else()
LIST(APPEND ${_out_compile_flags} "${CMAKE_CXX${_cxx_standard}_STANDARD_COMPILE_OPTION}")
endif()
endif()
ELSE()
## TODO ... ? or does it work out of the box
ENDIF()
GET_DIRECTORY_PROPERTY(DIRINC INCLUDE_DIRECTORIES )
FOREACH(item ${DIRINC})
ocv_is_opencv_directory(__result ${item})
if(__result)
LIST(APPEND ${_out_compile_flags} "${_PCH_include_prefix}\"${item}\"")
elseif(CMAKE_COMPILER_IS_GNUCXX AND NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS "6.0" AND
item MATCHES "/usr/include$")
# workaround for GCC 6.x bug
else()
LIST(APPEND ${_out_compile_flags} "${_PCH_isystem_prefix}\"${item}\"")
endif()
ENDFOREACH(item)
get_target_property(DIRINC ${_PCH_current_target} INCLUDE_DIRECTORIES )
FOREACH(item ${DIRINC})
ocv_is_opencv_directory(__result ${item})
if(__result)
LIST(APPEND ${_out_compile_flags} "${_PCH_include_prefix}\"${item}\"")
elseif(CMAKE_COMPILER_IS_GNUCXX AND NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS "6.0" AND
item MATCHES "/usr/include$")
# workaround for GCC 6.x bug
else()
LIST(APPEND ${_out_compile_flags} "${_PCH_isystem_prefix}\"${item}\"")
endif()
ENDFOREACH(item)
LIST(APPEND ${_out_compile_flags} ${CMAKE_CXX_FLAGS})
SEPARATE_ARGUMENTS(${_out_compile_flags})
ENDMACRO(_PCH_GET_COMPILE_FLAGS)
MACRO(_PCH_WRITE_PCHDEP_CXX _targetName _include_file _dephelp)
set(${_dephelp} "${CMAKE_CURRENT_BINARY_DIR}/${_targetName}_pch_dephelp.cxx")
set(_content "")
if(EXISTS "${${_dephelp}}")
file(READ "${${_dephelp}}" _content)
endif()
set(_dummy_str
"#include \"${_include_file}\"
int testfunction();
int testfunction()
{
return 0;
}
")
if(NOT _content STREQUAL _dummy_str)
file(WRITE "${${_dephelp}}" "${_dummy_str}")
endif()
ENDMACRO(_PCH_WRITE_PCHDEP_CXX )
MACRO(_PCH_GET_COMPILE_COMMAND out_command _input _output)
FILE(TO_NATIVE_PATH ${_input} _native_input)
FILE(TO_NATIVE_PATH ${_output} _native_output)
IF(CMAKE_COMPILER_IS_GNUCXX)
IF(CMAKE_CXX_COMPILER_ARG1)
# remove leading space in compiler argument
STRING(REGEX REPLACE "^ +" "" pchsupport_compiler_cxx_arg1 ${CMAKE_CXX_COMPILER_ARG1})
SET(${out_command}
${CMAKE_CXX_COMPILER} ${pchsupport_compiler_cxx_arg1} ${_compile_FLAGS} -x c++-header -o ${_output} ${_input}
)
ELSE(CMAKE_CXX_COMPILER_ARG1)
SET(${out_command}
${CMAKE_CXX_COMPILER} ${_compile_FLAGS} -x c++-header -o ${_output} ${_input}
)
ENDIF(CMAKE_CXX_COMPILER_ARG1)
ELSE(CMAKE_COMPILER_IS_GNUCXX)
SET(_dummy_str "#include <${_input}>")
FILE(WRITE ${CMAKE_CURRENT_BINARY_DIR}/pch_dummy.cpp ${_dummy_str})
SET(${out_command}
${CMAKE_CXX_COMPILER} ${_compile_FLAGS} /c /Fp${_native_output} /Yc${_native_input} pch_dummy.cpp
)
#/out:${_output}
ENDIF(CMAKE_COMPILER_IS_GNUCXX)
ENDMACRO(_PCH_GET_COMPILE_COMMAND )
MACRO(_PCH_GET_TARGET_COMPILE_FLAGS _cflags _header_name _pch_path _dowarn )
FILE(TO_NATIVE_PATH ${_pch_path} _native_pch_path)
IF(CMAKE_COMPILER_IS_GNUCXX)
# for use with distcc and gcc >4.0.1 if preprocessed files are accessible
# on all remote machines set
# PCH_ADDITIONAL_COMPILER_FLAGS to -fpch-preprocess
# if you want warnings for invalid header files (which is very inconvenient
# if you have different versions of the headers for different build types
# you may set _pch_dowarn
IF (_dowarn)
SET(${_cflags} "${PCH_ADDITIONAL_COMPILER_FLAGS} -Winvalid-pch " )
ELSE (_dowarn)
SET(${_cflags} "${PCH_ADDITIONAL_COMPILER_FLAGS} " )
ENDIF (_dowarn)
ELSE(CMAKE_COMPILER_IS_GNUCXX)
set(${_cflags} "/Fp${_native_pch_path} /Yu${_header_name}" )
ENDIF(CMAKE_COMPILER_IS_GNUCXX)
ENDMACRO(_PCH_GET_TARGET_COMPILE_FLAGS )
MACRO(GET_PRECOMPILED_HEADER_OUTPUT _targetName _input _output)
GET_FILENAME_COMPONENT(_name ${_input} NAME)
GET_FILENAME_COMPONENT(_path ${_input} PATH)
SET(${_output} "${CMAKE_CURRENT_BINARY_DIR}/${_name}.gch/${_targetName}_${CMAKE_BUILD_TYPE}.gch")
ENDMACRO(GET_PRECOMPILED_HEADER_OUTPUT _targetName _input)
MACRO(ADD_PRECOMPILED_HEADER_TO_TARGET _targetName _input _pch_output_to_use )
# to do: test whether compiler flags match between target _targetName
# and _pch_output_to_use
GET_FILENAME_COMPONENT(_name ${_input} NAME)
IF(ARGN STREQUAL "0")
SET(_dowarn 0)
ELSE()
SET(_dowarn 1)
ENDIF()
_PCH_GET_TARGET_COMPILE_FLAGS(_target_cflags ${_name} ${_pch_output_to_use} ${_dowarn})
#MESSAGE("Add flags ${_target_cflags} to ${_targetName} " )
if(CMAKE_COMPILER_IS_GNUCXX)
set(_target_cflags "${_target_cflags} -include \"${CMAKE_CURRENT_BINARY_DIR}/${_name}\"")
endif()
GET_TARGET_PROPERTY(_sources ${_targetName} SOURCES)
FOREACH(src ${_sources})
if(NOT "${src}" MATCHES "\\.mm$")
get_source_file_property(_flags "${src}" COMPILE_FLAGS)
get_source_file_property(_flags2 "${src}" COMPILE_DEFINITIONS)
if(NOT _flags AND NOT _flags2)
set_source_files_properties("${src}" PROPERTIES COMPILE_FLAGS "${_target_cflags}")
else()
#ocv_debug_message("Skip PCH, flags: ${oldProps} defines: ${oldProps2}, file: ${src}")
endif()
endif()
ENDFOREACH()
ADD_CUSTOM_TARGET(pch_Generate_${_targetName}
DEPENDS ${_pch_output_to_use}
)
ADD_DEPENDENCIES(${_targetName} pch_Generate_${_targetName} )
ENDMACRO(ADD_PRECOMPILED_HEADER_TO_TARGET)
MACRO(ADD_PRECOMPILED_HEADER _targetName _input)
SET(_PCH_current_target ${_targetName})
IF(NOT CMAKE_BUILD_TYPE)
MESSAGE(FATAL_ERROR
"This is the ADD_PRECOMPILED_HEADER macro. "
"You must set CMAKE_BUILD_TYPE!"
)
ENDIF()
IF(ARGN STREQUAL "0")
SET(_dowarn 0)
ELSE()
SET(_dowarn 1)
ENDIF()
GET_FILENAME_COMPONENT(_name ${_input} NAME)
GET_FILENAME_COMPONENT(_path ${_input} PATH)
GET_PRECOMPILED_HEADER_OUTPUT( ${_targetName} ${_input} _output)
_PCH_WRITE_PCHDEP_CXX(${_targetName} "${_input}" _pch_dephelp_cxx)
ADD_LIBRARY(${_targetName}_pch_dephelp STATIC "${_pch_dephelp_cxx}" "${_input}" )
set_target_properties(${_targetName}_pch_dephelp PROPERTIES
DEBUG_POSTFIX "${OPENCV_DEBUG_POSTFIX}"
ARCHIVE_OUTPUT_DIRECTORY "${LIBRARY_OUTPUT_PATH}"
)
_PCH_GET_COMPILE_FLAGS(_compile_FLAGS)
get_target_property(type ${_targetName} TYPE)
if(type STREQUAL "SHARED_LIBRARY")
get_target_property(__DEFINES ${_targetName} DEFINE_SYMBOL)
if(NOT __DEFINES MATCHES __DEFINES-NOTFOUND)
list(APPEND _compile_FLAGS "${_PCH_define_prefix}${__DEFINES}")
endif()
endif()
if(type STREQUAL "SHARED_LIBRARY" OR type STREQUAL "STATIC_LIBRARY")
get_target_property(__pic ${_targetName} POSITION_INDEPENDENT_CODE)
if(__pic AND CMAKE_CXX_COMPILE_OPTIONS_PIC
AND NOT OPENCV_SKIP_PCH_PIC_HANDLING
AND NOT OPENCV_SKIP_PCH_PIC_HANDLING_${_targetName}
)
list(APPEND _compile_FLAGS "${CMAKE_CXX_COMPILE_OPTIONS_PIC}")
endif()
elseif(type STREQUAL "EXECUTABLE")
get_target_property(__pie ${_targetName} POSITION_INDEPENDENT_CODE)
if(__pie AND CMAKE_CXX_COMPILE_OPTIONS_PIE
AND NOT OPENCV_SKIP_PCH_PIE_HANDLING
AND NOT OPENCV_SKIP_PCH_PIE_HANDLING_${_targetName}
)
list(APPEND _compile_FLAGS "${CMAKE_CXX_COMPILE_OPTIONS_PIE}")
endif()
endif()
get_target_property(DIRINC ${_targetName} INCLUDE_DIRECTORIES)
set_target_properties(${_targetName}_pch_dephelp PROPERTIES INCLUDE_DIRECTORIES "${DIRINC}")
#MESSAGE("_compile_FLAGS: ${_compile_FLAGS}")
#message("COMMAND ${CMAKE_CXX_COMPILER} ${_compile_FLAGS} -x c++-header -o ${_output} ${_input}")
ADD_CUSTOM_COMMAND(
OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/${_name}"
COMMAND ${CMAKE_COMMAND} -E copy_if_different "${_input}" "${CMAKE_CURRENT_BINARY_DIR}/${_name}" # ensure same directory! Required by gcc
DEPENDS "${_input}"
)
#message("_command ${_input} ${_output}")
_PCH_GET_COMPILE_COMMAND(_command ${CMAKE_CURRENT_BINARY_DIR}/${_name} ${_output} )
GET_FILENAME_COMPONENT(_outdir ${_output} PATH)
ADD_CUSTOM_COMMAND(
OUTPUT "${_output}"
COMMAND ${CMAKE_COMMAND} -E make_directory "${_outdir}"
COMMAND ${_command}
DEPENDS "${_input}"
DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/${_name}"
DEPENDS ${_targetName}_pch_dephelp
)
ADD_PRECOMPILED_HEADER_TO_TARGET(${_targetName} ${_input} ${_output} ${_dowarn})
ENDMACRO(ADD_PRECOMPILED_HEADER)
# Generates the use of precompiled in a target,
# without using depency targets (2 extra for each target)
# Using Visual, must also add ${_targetName}_pch to sources
# Not needed by Xcode
MACRO(GET_NATIVE_PRECOMPILED_HEADER _targetName _input)
if(ENABLE_PRECOMPILED_HEADERS)
if(CMAKE_GENERATOR MATCHES "^Visual.*$")
set(${_targetName}_pch ${CMAKE_CURRENT_BINARY_DIR}/${_targetName}_pch.cpp)
endif()
endif()
ENDMACRO(GET_NATIVE_PRECOMPILED_HEADER)
MACRO(ADD_NATIVE_PRECOMPILED_HEADER _targetName _input)
IF(ARGN STREQUAL "0")
SET(_dowarn 0)
ELSE()
SET(_dowarn 1)
ENDIF()
if(CMAKE_GENERATOR MATCHES "^Visual.*$")
# Auto include the precompile (useful for moc processing, since the use of
# precompiled is specified at the target level
# and I don't want to specifiy /F- for each moc/res/ui generated files (using Qt)
get_target_property(_sources ${_targetName} SOURCES)
foreach(src ${_sources})
if("${src}" MATCHES "\\.c(pp|xx)?$")
get_source_file_property(oldProps "${src}" COMPILE_FLAGS)
get_source_file_property(oldProps2 "${src}" COMPILE_DEFINITIONS)
if(NOT oldProps AND NOT oldProps2)
set(newProperties "/Yu\"${_input}\" /FI\"${_input}\"")
set_source_files_properties("${src}" PROPERTIES COMPILE_FLAGS "${newProperties}")
else()
ocv_debug_message("Skip PCH, flags: ${oldProps} defines: ${oldProps2}, file: ${src}")
endif()
endif()
endforeach()
#also inlude ${oldProps} to have the same compile options
GET_TARGET_PROPERTY(oldProps ${_targetName} COMPILE_FLAGS)
if (oldProps MATCHES NOTFOUND)
SET(oldProps "")
endif()
SET_SOURCE_FILES_PROPERTIES(${${_targetName}_pch} PROPERTIES COMPILE_FLAGS "${oldProps} /Yc\"${_input}\"")
set(_dummy_str "#include \"${_input}\"\n")
set(${_targetName}_pch ${CMAKE_CURRENT_BINARY_DIR}/${_targetName}_pch.cpp)
if(EXISTS ${${_targetName}_pch})
file(READ "${${_targetName}_pch}" _contents)
endif()
if(NOT _dummy_str STREQUAL "${_contents}")
file(WRITE ${${_targetName}_pch} ${_dummy_str})
endif()
elseif (CMAKE_GENERATOR MATCHES Xcode)
# For Xcode, cmake needs my patch to process
# GCC_PREFIX_HEADER and GCC_PRECOMPILE_PREFIX_HEADER as target properties
# When buiding out of the tree, precompiled may not be located
# Use full path instead.
GET_FILENAME_COMPONENT(fullPath ${_input} ABSOLUTE)
SET_TARGET_PROPERTIES(${_targetName} PROPERTIES XCODE_ATTRIBUTE_GCC_PREFIX_HEADER "${fullPath}")
SET_TARGET_PROPERTIES(${_targetName} PROPERTIES XCODE_ATTRIBUTE_GCC_PRECOMPILE_PREFIX_HEADER "YES")
else()
#Fallback to the "old" precompiled suppport
#ADD_PRECOMPILED_HEADER(${_targetName} ${_input} ${_dowarn})
endif()
ENDMACRO(ADD_NATIVE_PRECOMPILED_HEADER)
macro(ocv_add_precompiled_header_to_target the_target pch_header)
if(PCHSupport_FOUND AND ENABLE_PRECOMPILED_HEADERS AND EXISTS "${pch_header}")
if(CMAKE_GENERATOR MATCHES "^Visual" OR CMAKE_GENERATOR MATCHES Xcode)
add_native_precompiled_header(${the_target} ${pch_header})
elseif(CMAKE_COMPILER_IS_GNUCXX AND CMAKE_GENERATOR MATCHES "Makefiles|Ninja")
add_precompiled_header(${the_target} ${pch_header})
endif()
endif()
endmacro()
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