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CMake: Add #include in _FORTIFY_SOURCE check. #4214

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Some toolchains apparently set _FORTIFY_SOURCE=2 in internal header
files. Include <string.h> (which in turn should include such internal
header files) before checking the value of _FORTIFY_SOURCE to catch
that.

Fixes #4183.
This commit is contained in:
Florian Walch 2016-02-09 22:22:30 +01:00
parent dcdb50b64b
commit e7615ddc22
1 changed files with 4 additions and 0 deletions
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4
CMakeLists.txt
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@ -153,7 +153,11 @@ if(${INIT_FLAGS_NAME})
set(CMAKE_REQUIRED_FLAGS "${${INIT_FLAGS_NAME}}")
endif()
# Include <string.h> because some toolchains define _FORTIFY_SOURCE=2 in
# internal header files, which should in turn be #included by <string.h>.
check_c_source_compiles("
#include <string.h>
#if defined(_FORTIFY_SOURCE) && _FORTIFY_SOURCE > 1
#error \"_FORTIFY_SOURCE > 1\"
#endif