Avoid warnings about redefining _FORTIFY_SOURCE

Undefine the macro befor redefining it.

Change-Id: I31187307273c138f8d5380c74f9e0619af15cdd9

diff --git a/build/make/configure.sh b/build/make/configure.sh
index 0f6c6ca46ca25bf048cf0519b64f86706be1d06d..e5166f8448b3e1dc3737bc4fb475f655a941f81c 100755 (executable)
--- a/build/make/configure.sh
+++ b/build/make/configure.sh
@@ -1128,7 +1128,7 @@ process_common_toolchain() {
 
     # Work around longjmp interception on glibc >= 2.11, to improve binary
     # compatibility. See http://code.google.com/p/webm/issues/detail?id=166
-    enabled linux && check_add_cflags -D_FORTIFY_SOURCE=0
+    enabled linux && check_add_cflags -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=0
 
     # Check for strip utility variant
     ${STRIP} -V 2>/dev/null | grep GNU >/dev/null && enable gnu_strip