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- # - 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.
- # See help for CheckCSourceCompiles for a listing of variables
- # that can modify the build.
- #=============================================================================
- # Copyright 2006-2011 Kitware, Inc.
- # Copyright 2006 Alexander Neundorf <[email protected]>
- # Copyright 2011 Matthias Kretz <[email protected]>
- #
- # 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}")
- CHECK_C_SOURCE_COMPILES("int main(void) { return 0; }" ${_RESULT}
- # Some compilers do not fail with a bad flag
- FAIL_REGEX "command line option .* is valid for .* but not for C" # GNU
- FAIL_REGEX "unrecognized .*option" # GNU
- FAIL_REGEX "unknown .*option" # Clang
- FAIL_REGEX "ignoring unknown option" # MSVC
- FAIL_REGEX "warning D9002" # MSVC, any lang
- FAIL_REGEX "option .*not supported" # Intel
- FAIL_REGEX "[Uu]nknown option" # HP
- FAIL_REGEX "[Ww]arning: [Oo]ption" # SunPro
- FAIL_REGEX "command option .* is not recognized" # XL
- FAIL_REGEX "WARNING: unknown flag:" # Open64
- )
- SET (CMAKE_REQUIRED_DEFINITIONS "${SAFE_CMAKE_REQUIRED_DEFINITIONS}")
- ENDMACRO (CHECK_C_COMPILER_FLAG)
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