+# - Check whether the CXX compiler supports a given flag.
+# CHECK_CXX_COMPILER_FLAG(<flag> <var>)
+# <flag> - the compiler flag
+# <var> - variable to store the result
+# This internally calls the check_cxx_source_compiles macro. See help
+# for CheckCXXSourceCompiles for a listing of variables that can
+# modify the build.
+
+#=============================================================================
+# Copyright 2006-2010 Kitware, Inc.
+# Copyright 2006 Alexander Neundorf <neundorf@kde.org>
+#
+# ORIGINAL Copyright notice (from Copyright.txt):
+#
+# CMake - Cross Platform Makefile Generator
+# Copyright 2000-2011 Kitware, Inc., Insight Software Consortium
+# All rights reserved.
+
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#
+# * Redistributions in binary form must reproduce the above copyright
+# notice, this list of conditions and the following disclaimer in the
+# documentation and/or other materials provided with the distribution.
+#
+# * Neither the names of Kitware, Inc., the Insight Software Consortium,
+# nor the names of their contributors may be used to endorse or promote
+# products derived from this software without specific prior written
+# permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#=============================================================================
+
+INCLUDE(CheckCXXSourceCompiles)
+
+MACRO (CHECK_CXX_COMPILER_FLAG _FLAG _RESULT)
+ SET(SAFE_CMAKE_REQUIRED_DEFINITIONS "${CMAKE_REQUIRED_DEFINITIONS}")
+ SET(CMAKE_REQUIRED_DEFINITIONS "${_FLAG}")
+ CHECK_CXX_SOURCE_COMPILES("int main() { return 0;}" ${_RESULT}
+ # Some compilers do not fail with a bad flag
+ FAIL_REGEX "command line option .* is valid for .* but not for C\\\\+\\\\+" # GNU
+ FAIL_REGEX "unrecognized .*option" # GNU
+ FAIL_REGEX "unknown .*option" # Clang
+ FAIL_REGEX "ignoring unknown option" # MSVC
+ FAIL_REGEX "warning D9002" # MSVC, any lang
+ FAIL_REGEX "option .*not supported" # Intel
+ FAIL_REGEX "invalid argument .*option" # Intel
+ FAIL_REGEX "ignoring option .*argument required" # Intel
+ FAIL_REGEX "[Uu]nknown option" # HP
+ FAIL_REGEX "[Ww]arning: [Oo]ption" # SunPro
+ FAIL_REGEX "command option .* is not recognized" # XL
+ FAIL_REGEX "not supported in this configuration; ignored" # AIX
+ FAIL_REGEX "File with unknown suffix passed to linker" # PGI
+ FAIL_REGEX "WARNING: unknown flag:" # Open64
+ )
+ SET (CMAKE_REQUIRED_DEFINITIONS "${SAFE_CMAKE_REQUIRED_DEFINITIONS}")
+ENDMACRO (CHECK_CXX_COMPILER_FLAG)
+