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On Apple's gcc, the compiler emits a warning such as "warning: command line option "-Wno-deprecated" is valid for C++/ObjC++ but not for C" when it is passed that flag on its command line. When testing for that flag with a plain C file, we should report that the flag is unsupported for C files. The new FAIL_REGEX option added here produces this behavior.
41 lines
1.9 KiB
CMake
41 lines
1.9 KiB
CMake
# - Check whether the C compiler supports a given flag.
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# CHECK_C_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_c_source_compiles macro.
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# See help for CheckCSourceCompiles for a listing of variables
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# that can 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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#
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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(CheckCSourceCompiles)
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MACRO (CHECK_C_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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CHECK_C_SOURCE_COMPILES("int main(void) { return 0; }" ${_RESULT}
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# Some compilers do not fail with a bad flag
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FAIL_REGEX "warning: command line option .* is valid for .* but not for C"
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# Apple gcc
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FAIL_REGEX "unrecognized .*option" # GNU
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FAIL_REGEX "ignoring unknown option" # MSVC
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FAIL_REGEX "warning D9002" # MSVC, any lang
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FAIL_REGEX "[Uu]nknown option" # HP
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FAIL_REGEX "[Ww]arning: [Oo]ption" # SunPro
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FAIL_REGEX "command option .* is not recognized" # XL
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)
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SET (CMAKE_REQUIRED_DEFINITIONS "${SAFE_CMAKE_REQUIRED_DEFINITIONS}")
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ENDMACRO (CHECK_C_COMPILER_FLAG)
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