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3e79d656da
Explain how CMAKE_REQUIRED_DEFINITIONS is set before calling the check_*_source_compiles macros.
63 lines
2.9 KiB
CMake
63 lines
2.9 KiB
CMake
# - Check whether the CXX compiler supports a given flag.
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# CHECK_CXX_COMPILER_FLAG(<flag> <var>)
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# <flag> - the compiler flag
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# <var> - variable to store the result
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# This internally calls the check_cxx_source_compiles macro and
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# sets CMAKE_REQUIRED_DEFINITIONS to <flag>.
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# See help for CheckCXXSourceCompiles for a listing of variables
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# that can otherwise modify the build.
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#=============================================================================
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# Copyright 2006-2010 Kitware, Inc.
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# Copyright 2006 Alexander Neundorf <neundorf@kde.org>
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# Copyright 2011 Matthias Kretz <kretz@kde.org>
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#
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# Distributed under the OSI-approved BSD License (the "License");
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# see accompanying file Copyright.txt for details.
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#
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# This software is distributed WITHOUT ANY WARRANTY; without even the
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# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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# See the License for more information.
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#=============================================================================
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# (To distribute this file outside of CMake, substitute the full
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# License text for the above reference.)
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include(CheckCXXSourceCompiles)
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macro (CHECK_CXX_COMPILER_FLAG _FLAG _RESULT)
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set(SAFE_CMAKE_REQUIRED_DEFINITIONS "${CMAKE_REQUIRED_DEFINITIONS}")
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set(CMAKE_REQUIRED_DEFINITIONS "${_FLAG}")
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# Normalize locale during test compilation.
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set(_CheckCXXCompilerFlag_LOCALE_VARS LC_ALL LC_MESSAGES LANG)
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foreach(v ${_CheckCXXCompilerFlag_LOCALE_VARS})
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set(_CheckCXXCompilerFlag_SAVED_${v} "$ENV{${v}}")
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set(ENV{${v}} C)
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endforeach()
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CHECK_CXX_SOURCE_COMPILES("int main() { return 0;}" ${_RESULT}
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# Some compilers do not fail with a bad flag
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FAIL_REGEX "command line option .* is valid for .* but not for C\\\\+\\\\+" # GNU
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FAIL_REGEX "unrecognized .*option" # GNU
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FAIL_REGEX "unknown .*option" # Clang
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FAIL_REGEX "ignoring unknown option" # MSVC
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FAIL_REGEX "warning D9002" # MSVC, any lang
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FAIL_REGEX "option.*not supported" # Intel
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FAIL_REGEX "invalid argument .*option" # Intel
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FAIL_REGEX "ignoring option .*argument required" # Intel
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FAIL_REGEX "[Uu]nknown option" # HP
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FAIL_REGEX "[Ww]arning: [Oo]ption" # SunPro
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FAIL_REGEX "command option .* is not recognized" # XL
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FAIL_REGEX "not supported in this configuration; ignored" # AIX
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FAIL_REGEX "File with unknown suffix passed to linker" # PGI
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FAIL_REGEX "WARNING: unknown flag:" # Open64
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)
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foreach(v ${_CheckCXXCompilerFlag_LOCALE_VARS})
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set(ENV{${v}} ${_CheckCXXCompilerFlag_SAVED_${v}})
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unset(_CheckCXXCompilerFlag_SAVED_${v})
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endforeach()
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unset(_CheckCXXCompilerFlag_LOCALE_VARS)
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set (CMAKE_REQUIRED_DEFINITIONS "${SAFE_CMAKE_REQUIRED_DEFINITIONS}")
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endmacro ()
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