This prevents such annoying warning:
<command-line>:0:0: warning: "_FORTIFY_SOURCE" redefined [enabled by default]
---
acinclude.m4 | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/acinclude.m4 b/acinclude.m4
index 0a59871..65118da 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -12,7 +12,7 @@ AC_DEFUN([AC_PROG_CC_PIE], [
AC_DEFUN([COMPILER_FLAGS], [
if (test "${CFLAGS}" = ""); then
- CFLAGS="-Wall -O2 -D_FORTIFY_SOURCE=2"
+ CFLAGS="-Wall -O2 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2"
fi
if (test "$USE_MAINTAINER_MODE" = "yes"); then
CFLAGS+=" -Werror -Wextra"
--
1.8.4.4
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