From: claudio <claudio@openbsd.org>
Date: Wed, 14 Jul 2010 17:06:52 +0000 (+0000)
Subject: use offsetof() instead of self knitted version to please gcc4.
X-Git-Url: http://artulab.com/gitweb/?a=commitdiff_plain;h=a6417e4f7f220ad3f1e66750b805bafb4d6189db;p=openbsd

use offsetof() instead of self knitted version to please gcc4.
stolen from ospf.h
---

diff --git a/usr.sbin/ospf6d/ospf6.h b/usr.sbin/ospf6d/ospf6.h
index 00b70742476..10f8889cb1e 100644
--- a/usr.sbin/ospf6d/ospf6.h
+++ b/usr.sbin/ospf6d/ospf6.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: ospf6.h,v 1.16 2010/02/23 11:20:03 claudio Exp $ */
+/*	$OpenBSD: ospf6.h,v 1.17 2010/07/14 17:06:52 claudio Exp $ */
 
 /*
  * Copyright (c) 2004, 2005, 2007 Esben Norby <norby@openbsd.org>
@@ -22,6 +22,7 @@
 #define _OSPF_H_
 
 #include <netinet/in.h>
+#include <stddef.h>
 
 /* misc */
 #define OSPF6_VERSION		3
@@ -281,7 +282,7 @@ struct lsa_hdr {
 	u_int16_t		len;
 };
 
-#define LS_CKSUM_OFFSET	((u_int16_t)(&((struct lsa_hdr *)0)->ls_chksum))
+#define LS_CKSUM_OFFSET	offsetof(struct lsa_hdr, ls_chksum)
 
 struct lsa {
 	struct lsa_hdr		hdr;