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extern/cmake/2.85/share/cmake-2.8/Modules/CheckCCompilerFlag.cmake

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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 2006-2010 Kitware, Inc.
+# Copyright 2006 Alexander Neundorf <neundorf@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; }" ${_RESULT}
+     # Some compilers do not fail with a bad flag
+     FAIL_REGEX "unrecognized .*option"                     # GNU
+     FAIL_REGEX "ignoring unknown option"                   # MSVC
+     FAIL_REGEX "warning D9002"                             # MSVC, any lang
+     FAIL_REGEX "[Uu]nknown option"                         # HP
+     FAIL_REGEX "[Ww]arning: [Oo]ption"                     # SunPro
+     FAIL_REGEX "command option .* is not recognized"       # XL
+     )
+   SET (CMAKE_REQUIRED_DEFINITIONS "${SAFE_CMAKE_REQUIRED_DEFINITIONS}")
+ENDMACRO (CHECK_C_COMPILER_FLAG)
+