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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>
#
# 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.
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#=============================================================================

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)