From: Neil Brown <neilb@suse.de>
Date: Mon, 29 May 2006 02:06:32 +0000 (+0000)
Subject: This is to avoid gcc warnings when building with strict-aliasing optimization
X-Git-Tag: mdadm-2.5.1~24
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b1ec2d6a74ca0a4d139563c2a2a08f7903355843;p=thirdparty%2Fmdadm.git

This is to avoid gcc warnings when building with strict-aliasing optimization

fix for another srict-aliasing problem, you can typecast a reference to a
void pointer to anything, you cannot typecast a reference to a
struct.

From: Luca Berra <bluca@vodka.it>
Signed-off-by: Neil Brown <neilb@suse.de>
---

diff --git a/dlink.h b/dlink.h
index 15cab938..8e3f4cf9 100644
--- a/dlink.h
+++ b/dlink.h
@@ -4,16 +4,16 @@
 
 struct __dl_head
 {
-    struct __dl_head *	dh_prev;
-    struct __dl_head *	dh_next;
+    void * dh_prev;
+    void * dh_next;
 };
 
 #define	dl_alloc(size)	((void*)(((char*)calloc(1,(size)+sizeof(struct __dl_head)))+sizeof(struct __dl_head)))
 #define	dl_new(t)	((t*)dl_alloc(sizeof(t)))
 #define	dl_newv(t,n)	((t*)dl_alloc(sizeof(t)*n))
 
-#define dl_next(p) *((void**)&(((struct __dl_head*)(p))[-1].dh_next))
-#define dl_prev(p) *((void**)&(((struct __dl_head*)(p))[-1].dh_prev))
+#define dl_next(p) *(&(((struct __dl_head*)(p))[-1].dh_next))
+#define dl_prev(p) *(&(((struct __dl_head*)(p))[-1].dh_prev))
 
 void *dl_head(void);
 char *dl_strdup(char *);