From 8b34e8637d238161440e743e8937db09304c77b8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ren=C3=A9=20Kijewski?= <rene.kijewski@fu-berlin.de>
Date: Wed, 7 May 2014 13:02:46 +0200
Subject: [PATCH] make: fast out on old-style function definitions

---
 Makefile.cflags | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Makefile.cflags b/Makefile.cflags
index 220215f413..d1478e5dc0 100644
--- a/Makefile.cflags
+++ b/Makefile.cflags
@@ -21,3 +21,11 @@ ifeq ($(shell LANG=C $(CC) -fno-delete-null-pointer-checks -E - 2>&1 1>/dev/null
 CFLAGS += -fno-delete-null-pointer-checks
 endif
 endif
+
+# Fast-out on old style function definitions.
+# They cause unreadable error compiler errors on missing semicolons.
+# Worse yet they hide errors by accepting wildcard argument types.
+ifeq ($(shell $(CC) -Wstrict-prototypes -Werror=strict-prototypes -Wold-style-definition -Werror=old-style-definition -E - 2>/dev/null >/dev/null </dev/null ; echo $$?),0)
+# duplicated parameters don't hurt
+CFLAGS += -Wstrict-prototypes -Werror=strict-prototypes -Wold-style-definition -Werror=old-style-definition
+endif