1 # - Check whether the C compiler supports a given flag in the
2 # context of a stack checking compiler option.
4 # CHECK_C_COMPILER_FLAG_SSP(FLAG VARIABLE)
6 # FLAG - the compiler flag
7 # VARIABLE - variable to store the result
9 # This actually calls check_c_source_compiles.
10 # See help for CheckCSourceCompiles for a listing of variables
11 # that can modify the build.
13 # Copyright (c) 2006, Alexander Neundorf, <neundorf@kde.org>
15 # Redistribution and use is allowed according to the terms of the BSD license.
16 # For details see the accompanying COPYING-CMAKE-SCRIPTS file.
19 #include_guard(GLOBAL)
20 include(CheckCSourceCompiles)
21 include(CMakeCheckCompilerFlagCommonPatterns)
23 macro(CHECK_C_COMPILER_FLAG_SSP _FLAG _RESULT)
24 set(SAFE_CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")
25 set(CMAKE_REQUIRED_FLAGS "${_FLAG}")
27 # Normalize locale during test compilation.
28 set(_CheckCCompilerFlag_LOCALE_VARS LC_ALL LC_MESSAGES LANG)
29 foreach(v ${_CheckCCompilerFlag_LOCALE_VARS})
30 set(_CheckCCompilerFlag_SAVED_${v} "$ENV{${v}}")
34 CHECK_COMPILER_FLAG_COMMON_PATTERNS(_CheckCCompilerFlag_COMMON_PATTERNS)
35 check_c_source_compiles("int main(int argc, char **argv) { char buffer[256]; return buffer[argc]=0;}"
37 # Some compilers do not fail with a bad flag
38 FAIL_REGEX "command line option .* is valid for .* but not for C" # GNU
39 ${_CheckCCompilerFlag_COMMON_PATTERNS})
40 foreach(v ${_CheckCCompilerFlag_LOCALE_VARS})
41 set(ENV{${v}} ${_CheckCCompilerFlag_SAVED_${v}})
42 unset(_CheckCCompilerFlag_SAVED_${v})
44 unset(_CheckCCompilerFlag_LOCALE_VARS)
45 unset(_CheckCCompilerFlag_COMMON_PATTERNS)
47 set(CMAKE_REQUIRED_FLAGS "${SAFE_CMAKE_REQUIRED_FLAGS}")
48 endmacro(CHECK_C_COMPILER_FLAG_SSP)