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source: code/branches/pch/cmake/GetGCCCompilerFlags.cmake @ 3128

Last change on this file since 3128 was 3117, checked in by rgrieder, 16 years ago

Adding experimental precompiled header file support. It seems to work quite well with MSVC, but has a performance penalty when used with GCC

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1 #
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6 #         modify it under the terms of the GNU General Public License
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13 #                 GNU General Public License for more details.
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17 #     Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
18 #
19 #
20 #  Author:
21 #    Reto Grieder
22 #  Description:
23 #    Tries to return all GCC compiler flags set for a target. This also
24 #    all definitions of the current directory.
25 #
26
27INCLUDE(SeparateFlags)
28
29FUNCTION(GET_GCC_COMPILER_FLAGS _target _flagsvar)
30
31  # General flags
32  STRING(TOUPPER "${CMAKE_BUILD_TYPE}" _build_type_upper)
33  SET(_flag_str "${CMAKE_CXX_FLAGS} ${CMAKE_CXX_FLAGS_${_build_type_upper}}")
34
35  # Include directories
36  GET_DIRECTORY_PROPERTY(_include_dirs INCLUDE_DIRECTORIES)
37  IF(_include_dirs)
38    FOREACH(_directory ${_include_dirs})
39      SET(_flag_str "${_flag_str} -I${_directory}")
40    ENDFOREACH(_directory)
41  ENDIF()
42
43  # For shared libraries linked with gcc, we have to add -fPIC
44  #GET_TARGET_PROPERTY(_target_type ${_target} TYPE)
45  #IF(${_target_type} STREQUAL SHARED_LIBRARY)
46  #  SET(_flag_str "${_flag_str} -fPIC")
47  #ENDIF()
48
49  # Target compile flags
50  GET_TARGET_PROPERTY(_target_flags ${_target} COMPILE_FLAGS)
51  IF(_target_flags)
52    SET(_flag_str "${_flag_str} ${_target_flags}")
53  ENDIF()
54
55  # Definitions from target and directory
56  GET_DIRECTORY_PROPERTY(_directory_defs                 COMPILE_DEFINITIONS)
57  GET_DIRECTORY_PROPERTY(_directory_defs_build_type      COMPILE_DEFINITIONS_${_build_type_upper})
58  GET_TARGET_PROPERTY(_target_defs            ${_target} COMPILE_DEFINITIONS)
59  GET_TARGET_PROPERTY(_target_defs_build_type ${_target} COMPILE_DEFINITIONS_${_build_type_upper})
60  GET_TARGET_PROPERTY(_target_def_symbol      ${_target} DEFINE_SYMBOL)
61  # Prefix them all with a "-D" if the property was found
62  FOREACH(_def ${_directory_defs} ${_directory_defs_build_type} ${_target_defs}
63               ${_target_defs_build_type} ${_target_def_symbol})
64    IF(_def)
65      SET(_flag_str "${_flag_str} -D${_def}")
66    ENDIF(_def)
67  ENDFOREACH(_def)
68
69  SEPARATE_FLAGS("${_flag_str}" _flags)
70  LIST(REMOVE_DUPLICATES _flags)
71  SET(${_flagsvar} ${_flags} PARENT_SCOPE)
72
73ENDFUNCTION(GET_GCC_COMPILER_FLAGS)
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