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//proc/self/root/usr/share/cmake/Modules/CheckCCompilerFlag.cmake
# - Check whether the C compiler supports a given flag. # CHECK_C_COMPILER_FLAG(<flag> <var>) # <flag> - the compiler flag # <var> - variable to store the result # This internally calls the check_c_source_compiles macro and # sets CMAKE_REQUIRED_DEFINITIONS to <flag>. # See help for CheckCSourceCompiles for a listing of variables # that can otherwise modify the build. # The result only tells that the compiler does not give an error message when # it encounters the flag. If the flag has any effect or even a specific one is # beyond the scope of this module. #============================================================================= # Copyright 2006-2011 Kitware, Inc. # Copyright 2006 Alexander Neundorf <neundorf@kde.org> # Copyright 2011 Matthias Kretz <kretz@kde.org> # # Distributed under the OSI-approved BSD License (the "License"); # see accompanying file Copyright.txt for details. # # This software is distributed WITHOUT ANY WARRANTY; without even the # implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. # See the License for more information. #============================================================================= # (To distribute this file outside of CMake, substitute the full # License text for the above reference.) include(CheckCSourceCompiles) macro (CHECK_C_COMPILER_FLAG _FLAG _RESULT) set(SAFE_CMAKE_REQUIRED_DEFINITIONS "${CMAKE_REQUIRED_DEFINITIONS}") set(CMAKE_REQUIRED_DEFINITIONS "${_FLAG}") # Normalize locale during test compilation. set(_CheckCCompilerFlag_LOCALE_VARS LC_ALL LC_MESSAGES LANG) foreach(v ${_CheckCCompilerFlag_LOCALE_VARS}) set(_CheckCCompilerFlag_SAVED_${v} "$ENV{${v}}") set(ENV{${v}} C) endforeach() CHECK_C_SOURCE_COMPILES("int main(void) { return 0; }" ${_RESULT} # Some compilers do not fail with a bad flag FAIL_REGEX "command line option .* is valid for .* but not for C" # GNU FAIL_REGEX "unrecognized .*option" # GNU FAIL_REGEX "unknown .*option" # Clang FAIL_REGEX "ignoring unknown option" # MSVC FAIL_REGEX "warning D9002" # MSVC, any lang FAIL_REGEX "option.*not supported" # Intel FAIL_REGEX "invalid argument .*option" # Intel FAIL_REGEX "ignoring option .*argument required" # Intel FAIL_REGEX "[Uu]nknown option" # HP FAIL_REGEX "[Ww]arning: [Oo]ption" # SunPro FAIL_REGEX "command option .* is not recognized" # XL FAIL_REGEX "WARNING: unknown flag:" # Open64 ) foreach(v ${_CheckCCompilerFlag_LOCALE_VARS}) set(ENV{${v}} ${_CheckCCompilerFlag_SAVED_${v}}) unset(_CheckCCompilerFlag_SAVED_${v}) endforeach() unset(_CheckCCompilerFlag_LOCALE_VARS) set (CMAKE_REQUIRED_DEFINITIONS "${SAFE_CMAKE_REQUIRED_DEFINITIONS}") endmacro ()
