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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 <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}")
+ CHECK_C_SOURCE_COMPILES("int main(void) { return 0; }" ${_RESULT}
+ # Some compilers do not fail with a bad flag
+ FAIL_REGEX "command line option .* is valid for .* but not for C" # GNU
+ FAIL_REGEX "unrecognized .*option" # GNU
+ FAIL_REGEX "unknown .*option" # Clang
+ FAIL_REGEX "ignoring unknown option" # MSVC
+ FAIL_REGEX "warning D9002" # MSVC, any lang
+ FAIL_REGEX "option.*not supported" # Intel
+ FAIL_REGEX "invalid argument .*option" # Intel
+ FAIL_REGEX "ignoring option .*argument required" # Intel
+ FAIL_REGEX "[Uu]nknown option" # HP
+ FAIL_REGEX "[Ww]arning: [Oo]ption" # SunPro
+ FAIL_REGEX "command option .* is not recognized" # XL
+ FAIL_REGEX "WARNING: unknown flag:" # Open64
+ )
+ SET (CMAKE_REQUIRED_DEFINITIONS "${SAFE_CMAKE_REQUIRED_DEFINITIONS}")
+ENDMACRO (CHECK_C_COMPILER_FLAG)