If the _FORTIFY_SOURCE has been already defined, we unconditionally redefine it, leaving us with warning/error thrown at compilation time. --- m4/virt-compile-warnings.m4 | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/m4/virt-compile-warnings.m4 b/m4/virt-compile-warnings.m4 index 913abca..1c58ebe 100644 --- a/m4/virt-compile-warnings.m4 +++ b/m4/virt-compile-warnings.m4 @@ -86,7 +86,7 @@ AC_DEFUN([LIBVIRT_DESIGNER_COMPILE_WARNINGS],[ # Use improved glibc headers AH_VERBATIM([FORTIFY_SOURCE], [/* Enable compile-time and run-time bounds-checking, and some warnings. */ - #if defined __OPTIMIZE__ && __OPTIMIZE__ + #if !defined _FORTIFY_SOURCE && defined __OPTIMIZE__ && __OPTIMIZE__ # define _FORTIFY_SOURCE 2 #endif ]) -- 1.8.1.5