64 lines
2.5 KiB
CMake
64 lines
2.5 KiB
CMake
#-------------------------------------------------------------------
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# This file is part of the CMake build system for OGRE
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# (Object-oriented Graphics Rendering Engine)
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# For the latest info, see http://www.ogre3d.org/
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#
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# The contents of this file are placed in the public domain. Feel
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# free to make use of it in any way you like.
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#-------------------------------------------------------------------
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##################################################################
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# Support macro to use a precompiled header
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# Usage:
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# use_precompiled_header(TARGET HEADER_FILE SRC_FILE)
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##################################################################
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macro(use_precompiled_header TARGET HEADER_FILE SRC_FILE)
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get_filename_component(HEADER ${HEADER_FILE} NAME)
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if (MSVC)
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add_definitions(/Yu"${HEADER}")
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set_source_files_properties(${SRC_FILE}
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PPROPERTIES COMPILE_FLAGS /Yc"${HEADER}"
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)
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elseif (CMAKE_COMPILER_IS_GNUCXX)
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# disabled because it seems to increase compile time
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## this is some serious hack... we definitely need native
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## support in CMake for this!
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## we will generate the precompiled header via a workaround
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## first give the header a new name with the proper extension
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#set(PRECOMP_HEADER ${CMAKE_CURRENT_BINARY_DIR}/hacked/${HEADER}.gch)
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#configure_file(${HEADER_FILE} ${PRECOMP_HEADER} COPYONLY)
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## retrieve some info about the target's build settings
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#get_target_property(${TARGET} PRECOMP_TYPE TYPE)
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#if (PRECOMP_TYPE STREQUAL "SHARED_LIBRARY")
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# set(PRECOMP_LIBTYPE "SHARED")
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#else ()
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# set(PRECOMP_LIBTYPE "STATIC")
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#endif ()
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#get_target_property(${TARGET} PRECOMP_DEFINITIONS COMPILE_DEFINITIONS)
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#get_target_property(${TARGET} PRECOMP_FLAGS COMPILE_FLAGS)
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#
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## add a new target which compiles the header
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#add_library(__precomp_header ${PRECOMP_LIBTYPE} ${PRECOMP_HEADER})
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#add_dependencies(${TARGET} __precomp_header)
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#set_target_properties(__precomp_header PROPERTIES
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# COMPILE_DEFINITIONS ${PRECOMP_DEFINITIONS}
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# COMPILE_FLAGS ${PRECOMP_FLAGS}
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# HAS_CXX TRUE
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#)
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#set_source_files_properties(${PRECOMP_HEADER} PROPERTIES
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# HEADER_FILE_ONLY FALSE
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# KEEP_EXTENSION TRUE
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# COMPILE_FLAGS "-x c++-header"
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# LANGUAGE CXX
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#)
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#
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## finally, we need to ensure that gcc can find the precompiled header
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## this is another dirty hack
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#include_directories(BEFORE "${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/__precomp_header.dir/hacked")
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endif ()
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endmacro(use_precompiled_header)
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