Am Sonntag, den 17.12.2006, 21:55 +0100 schrieb klaas.holwerda: > Hi, > > I want to get gcc to use precompiled headers. > From http://gcc.gnu.org/onlinedocs/gcc/Precompiled-Headers.html > i read that i need to compile a header file ( containing #includes to > all others for instance ). > > I have this haeder file, how to compile it with Cmake? > > I tried CHECK_CXX_SOURCE_COMPILES( wxart2d.h DONNO ) > > But that does not produce a "wxart2d.gch" file. > > Understand that i do not need to get an executable nor library. > > Does somebody know how to do it? > > Has someone already succeeded in using precompiled headers with gcc on > Linux, any tips? > > Thanks, > > Klaas
Hello Rosegarden (http://www.rosegardenmusic.com/) uses experimental PCH support http://rosegarden.svn.sourceforge.net/viewvc/rosegarden/trunk/rosegarden/cmake_admin/FindPCHSupport.cmake?revision=7699&view=markup This macro works per directory. It adds a target for precompileing the header and every C++ source is compiled using it. I tweaked this version for applying PCH's per target (see attachment) My version should be used like this: <CMakeLists.txt> add_executable(test test.cpp) add_precompiled_header( test std_includes.h) </CMakeLists.txt> It's very experimental, but now my sources using boost.fusion compile about 6-8 times faster than without PCH. MfG Maik
# - 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 IF(CMAKE_COMPILER_IS_GNUCXX) EXEC_PROGRAM( ${CMAKE_CXX_COMPILER} ARGS --version OUTPUT_VARIABLE _compiler_output) STRING(REGEX REPLACE ".* ([0-9]\\.[0-9]\\.[0-9]) .*" "\\1" gcc_compiler_version ${_compiler_output}) #MESSAGE("GCC Version: ${gcc_compiler_version}") IF(gcc_compiler_version MATCHES "4\\.[0-9]\\.[0-9]") SET(PCHSupport_FOUND TRUE) ELSE(gcc_compiler_version MATCHES "4\\.[0-9]\\.[0-9]") IF(gcc_compiler_version MATCHES "3\\.4\\.[0-9]") SET(PCHSupport_FOUND TRUE) ENDIF(gcc_compiler_version MATCHES "3\\.4\\.[0-9]") ENDIF(gcc_compiler_version MATCHES "4\\.[0-9]\\.[0-9]") ENDIF(CMAKE_COMPILER_IS_GNUCXX) MACRO(ADD_PRECOMPILED_HEADER _targetName _input ) GET_FILENAME_COMPONENT(_name ${_input} NAME) SET(_source "${CMAKE_CURRENT_SOURCE_DIR}/${_input}") SET(_outdir "${CMAKE_CURRENT_BINARY_DIR}/${_name}.gch") MAKE_DIRECTORY(${_outdir}) SET(_output "${_outdir}/${CMAKE_BUILD_TYPE}.c++") STRING(TOUPPER "CMAKE_CXX_FLAGS_${CMAKE_BUILD_TYPE}" _flags_var_name) SET(_compiler_FLAGS ${${_flags_var_name}}) GET_DIRECTORY_PROPERTY(_directory_flags INCLUDE_DIRECTORIES) FOREACH(item ${_directory_flags}) LIST(APPEND _compiler_FLAGS "-I${item}") ENDFOREACH(item) GET_DIRECTORY_PROPERTY(_directory_flags DEFINITIONS) LIST(APPEND _compiler_FLAGS ${_directory_flags}) SEPARATE_ARGUMENTS(_compiler_FLAGS) #MESSAGE("_compiler_FLAGS: ${_compiler_FLAGS}") message("${CMAKE_CXX_COMPILER} ${_compiler_FLAGS} -x c++-header -o ${_output} ${_source}") ADD_CUSTOM_COMMAND( OUTPUT ${_output} COMMAND ${CMAKE_CXX_COMPILER} ${_compiler_FLAGS} -x c++-header -o ${_output} ${_source} DEPENDS ${_source} ) ADD_CUSTOM_TARGET(${_targetName}_gch DEPENDS ${_output}) ADD_DEPENDENCIES(${_targetName} ${_targetName}_gch) #SET(CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS} "-include ${_name} -Winvalid-pch -H") #SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -include ${_name} -Winvalid-pch") SET_TARGET_PROPERTIES(${_targetName} PROPERTIES COMPILE_FLAGS "-include ${_name} -Winvalid-pch" ) ENDMACRO(ADD_PRECOMPILED_HEADER)
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