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# - Check whether the C compiler supports a given flag in the
# context of a stack checking compiler option.
# CHECK_C_COMPILER_FLAG_SSP(FLAG VARIABLE)
#
# FLAG - the compiler flag
# VARIABLE - variable to store the result
#
# This actually calls check_c_source_compiles.
# See help for CheckCSourceCompiles for a listing of variables
# that can modify the build.
# Copyright (c) 2006, Alexander Neundorf, <neundorf@kde.org>
#
# Redistribution and use is allowed according to the terms of the BSD license.
# For details see the accompanying COPYING-CMAKE-SCRIPTS file.
# Requires cmake 3.10
#include_guard(GLOBAL)
include(CheckCSourceCompiles)
include(CMakeCheckCompilerFlagCommonPatterns)
macro(CHECK_C_COMPILER_FLAG_SSP _FLAG _RESULT)
set(SAFE_CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")
set(CMAKE_REQUIRED_FLAGS "${_FLAG}")
# Normalize locale during test compilation.
set(_CheckCCompilerFlag_LOCALE_VARS LC_ALL LC_MESSAGES LANG)
foreach(v ${_CheckCCompilerFlag_LOCALE_VARS})
set(_CheckCCompilerFlag_SAVED_${v} "$ENV{${v}}")
set(ENV{${v}} C)
endforeach()
CHECK_COMPILER_FLAG_COMMON_PATTERNS(_CheckCCompilerFlag_COMMON_PATTERNS)
check_c_source_compiles("int main(int argc, char **argv) { char buffer[256]; return buffer[argc]=0;}"
${_RESULT}
# Some compilers do not fail with a bad flag
FAIL_REGEX "command line option .* is valid for .* but not for C" # GNU
${_CheckCCompilerFlag_COMMON_PATTERNS})
foreach(v ${_CheckCCompilerFlag_LOCALE_VARS})
set(ENV{${v}} ${_CheckCCompilerFlag_SAVED_${v}})
unset(_CheckCCompilerFlag_SAVED_${v})
endforeach()
unset(_CheckCCompilerFlag_LOCALE_VARS)
unset(_CheckCCompilerFlag_COMMON_PATTERNS)
set(CMAKE_REQUIRED_FLAGS "${SAFE_CMAKE_REQUIRED_FLAGS}")
endmacro(CHECK_C_COMPILER_FLAG_SSP)
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