#------------------------------------------------------------------- # This file is part of the CMake build system for ARToolKit # # The contents of this file are placed in the public domain. Feel # free to make use of it in any way you like. #------------------------------------------------------------------- ################################################################## # Support macro to use a precompiled header # Usage: # use_precompiled_header(TARGET HEADER_FILE SRC_FILE) ################################################################## macro(use_precompiled_header TARGET HEADER_FILE SRC_FILE) get_filename_component(HEADER ${HEADER_FILE} NAME) if (MSVC) add_definitions(/Yu"${HEADER}") set_source_files_properties(${SRC_FILE} PPROPERTIES COMPILE_FLAGS /Yc"${HEADER}" ) elseif (CMAKE_COMPILER_IS_GNUCXX) # disabled because it seems to increase compile time ## this is some serious hack... we definitely need native ## support in CMake for this! ## we will generate the precompiled header via a workaround ## first give the header a new name with the proper extension #set(PRECOMP_HEADER ${CMAKE_CURRENT_BINARY_DIR}/hacked/${HEADER}.gch) #configure_file(${HEADER_FILE} ${PRECOMP_HEADER} COPYONLY) ## retrieve some info about the target's build settings #get_target_property(${TARGET} PRECOMP_TYPE TYPE) #if (PRECOMP_TYPE STREQUAL "SHARED_LIBRARY") # set(PRECOMP_LIBTYPE "SHARED") #else () # set(PRECOMP_LIBTYPE "STATIC") #endif () #get_target_property(${TARGET} PRECOMP_DEFINITIONS COMPILE_DEFINITIONS) #get_target_property(${TARGET} PRECOMP_FLAGS COMPILE_FLAGS) # ## add a new target which compiles the header #add_library(__precomp_header ${PRECOMP_LIBTYPE} ${PRECOMP_HEADER}) #add_dependencies(${TARGET} __precomp_header) #set_target_properties(__precomp_header PROPERTIES # COMPILE_DEFINITIONS ${PRECOMP_DEFINITIONS} # COMPILE_FLAGS ${PRECOMP_FLAGS} # HAS_CXX TRUE #) #set_source_files_properties(${PRECOMP_HEADER} PROPERTIES # HEADER_FILE_ONLY FALSE # KEEP_EXTENSION TRUE # COMPILE_FLAGS "-x c++-header" # LANGUAGE CXX #) # ## finally, we need to ensure that gcc can find the precompiled header ## this is another dirty hack #include_directories(BEFORE "${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/__precomp_header.dir/hacked") endif () endmacro(use_precompiled_header)