File libibverbs-fix_aliasing.patch of Package libibverbs

From: Jan Engelhardt <jengelh@inai.de>
Date: 2012-08-26 21:34:11.356459793 +0200

src: fix breakage of alignment constraints and strict aliasing

src/verbs.c: In function 'is_link_local_gid':
src/verbs.c:689:2: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
src/verbs.c:690:2: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
examples/pingpong.c: In function 'wire_gid_to_gid':
examples/pingpong.c:76:3: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
examples/pingpong.c: In function 'gid_to_wire_gid':
examples/pingpong.c:85:3: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]

---
 examples/pingpong.c |   13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

Index: examples/pingpong.c
===================================================================
--- examples/pingpong.c.orig	2014-01-17 17:56:03.555235512 +0100
+++ examples/pingpong.c	2014-01-17 18:00:03.448680268 +0100
@@ -67,21 +67,24 @@ int pp_get_port_info(struct ibv_context
 void wire_gid_to_gid(const char *wgid, union ibv_gid *gid)
 {
 	char tmp[9];
-	uint32_t v32;
+	uint32_t v32, v32n;
 	int i;
 
 	for (tmp[8] = 0, i = 0; i < 4; ++i) {
 		memcpy(tmp, wgid + i * 8, 8);
 		sscanf(tmp, "%x", &v32);
-		*(uint32_t *)(&gid->raw[i * 4]) = ntohl(v32);
+		v32n = ntohl(v32);
+		memcpy(&gid->raw[i*4], &v32n, sizeof(v32n));
 	}
 }
 
 void gid_to_wire_gid(const union ibv_gid *gid, char wgid[])
 {
 	int i;
+	uint32_t v32;
 
-	for (i = 0; i < 4; ++i)
-		sprintf(&wgid[i * 8], "%08x",
-			htonl(*(uint32_t *)(gid->raw + i * 4)));
+	for (i = 0; i < 4; ++i) {
+		memcpy(&v32, gid->raw + i * 4, sizeof(v32));
+		sprintf(&wgid[i * 8], "%08x", htonl(v32));
+	}
 }