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93 lines
4.2 KiB
CMake
93 lines
4.2 KiB
CMake
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# DON'T FORGET to include ${CMAKE_CURRENT_SOURCE_DIR} in include_directories for the compiler
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# to see the header, and ${CMAKE_CURRENT_BINARY_DIR} for the compiler to see the GCC PCH
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# "sources" - unexpanded cmake variable holding all the source files
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# "includes" - unexpanded cmake variable holding all include paths the PCH needs to know about
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# "target_name" - the name of the a special target used to build the PCH for GCC
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# "header_name" - the name of the PCH header, without the extension; "stdafx" or something similar;
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# note that the source file compiling the header needs to have the same name
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macro( precompiled_header sources includes target_name header_name compiler_defines )
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# MSVC precompiled headers cmake code
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if ( MSVC )
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set_source_files_properties( ${header_name}.cpp PROPERTIES COMPILE_FLAGS "/Yc${header_name}.h" )
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foreach( src_file ${${sources}} )
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if( ${src_file} MATCHES ".*cpp$" )
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set_source_files_properties( ${src_file} PROPERTIES COMPILE_FLAGS "/Yu${header_name}.h" )
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endif()
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endforeach()
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# ${header_name}.cpp has to come before ${header_name}.h,
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# otherwise we get a linker error...
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list( INSERT ${sources} 0 ${header_name}.h )
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list( INSERT ${sources} 0 ${header_name}.cpp )
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# GCC precompiled headers cmake code
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# We don't do this on Macs since GCC there goes haywire
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# when you try to generate a PCH with two "-arch" flags
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elseif( CMAKE_COMPILER_IS_GNUCXX AND NOT APPLE )
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# Get the compiler flags for this build type
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string( TOUPPER "CMAKE_CXX_FLAGS_${CMAKE_BUILD_TYPE}" flags_for_build_name )
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set( compile_flags ${${flags_for_build_name}} )
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# Add all the Qt include directories
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foreach( item ${${includes}} )
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list( APPEND compile_flags "-I${item}" )
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endforeach()
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# Get the list of all build-independent preprocessor definitions
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get_directory_property( defines_global COMPILE_DEFINITIONS )
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list( APPEND defines ${defines_global} )
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# Get the list of all build-dependent preprocessor definitions
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string( TOUPPER "COMPILE_DEFINITIONS_${CMAKE_BUILD_TYPE}" defines_for_build_name )
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get_directory_property( defines_build ${defines_for_build_name} )
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list( APPEND defines ${defines_build} )
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# Apppend special compiler defines
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list( APPEND defines ${compiler_defines} )
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# Add the "-D" prefix to all of them
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foreach( item ${defines} )
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list( APPEND all_define_flags "-D${item}" )
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endforeach()
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list( APPEND compile_flags ${all_define_flags} )
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# Prepare the compile flags var for passing to GCC
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separate_arguments( compile_flags )
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# Finally, build the precompiled header.
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# We don't add the buil command to add_custom_target
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# because that would force a PCH rebuild even when
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# the ${header_name}.h file hasn't changed. We add it to
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# a special add_custom_command to work around this problem.
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add_custom_target( ${target_name} ALL
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DEPENDS ${header_name}.h.gch
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)
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add_custom_command( OUTPUT ${header_name}.h.gch
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COMMAND ${CMAKE_CXX_COMPILER} ${compile_flags} ${CMAKE_CURRENT_SOURCE_DIR}/${header_name}.h -o ${header_name}.h.gch
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MAIN_DEPENDENCY ${CMAKE_CURRENT_SOURCE_DIR}/${header_name}.h
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WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
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VERBATIM )
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endif()
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endmacro()
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# Xcode PCH support. Has to be called *AFTER* the target is created.
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# "header_name" - the name of the PCH header, without the extension; "stdafx" or something similar;
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# note that the source file compiling the header needs to have the same name
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macro( xcode_pch header_name )
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if( APPLE )
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set_target_properties(
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${PROJECT_NAME}
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PROPERTIES
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XCODE_ATTRIBUTE_GCC_PREFIX_HEADER "${CMAKE_CURRENT_SOURCE_DIR}/${PCH_NAME}.h"
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XCODE_ATTRIBUTE_GCC_PRECOMPILE_PREFIX_HEADER "YES"
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)
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endif()
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endmacro()
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