From 4bf015d5623a4eacc0e1ebd0a5766bc1f9370197 Mon Sep 17 00:00:00 2001
From: "David E. O'Brien" <obrien@FreeBSD.org>
Date: Sat, 14 Jun 2003 06:01:35 +0000
Subject: [PATCH] Use GCC's internal built-in alloca implementation, when
 available.

Submitted by:	DES
---
 sys/sys/cdefs.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/sys/sys/cdefs.h b/sys/sys/cdefs.h
index ff81fb5a0d2d..0ecd23cd18a2 100644
--- a/sys/sys/cdefs.h
+++ b/sys/sys/cdefs.h
@@ -142,6 +142,11 @@
 #define	__section(x)	__attribute__((__section__(x)))
 #endif
 #endif
+#ifdef __GNUC__
+#define	alloca(sz)	__builtin_alloca(sz)
+#else
+#error FreeBSD alloca support needed for this compiler
+#endif
 
 /* XXX: should use `#if __STDC_VERSION__ < 199901'. */
 #if !(__GNUC__ == 2 && __GNUC_MINOR__ >= 7 || __GNUC__ >= 3)