[PATCH] Fix strict-aliasing warning in resolv/res_hconf.c

[Steve Ellcey]

OK, so here is a complete patch based on Pedro's proposal.  It compiles
fine for me on MIPS with the latest GCC.  OK to checkin?

Steve Ellcey
sellcey@imgtec.com


2015-05-28  Steve Ellcey  <sellcey@imgtec.com>

	* resolv/res_hconf.c (_res_hconf_reorder_addrs): Use a union to
	copy data from cur_ifr->ifr_addr.


diff --git a/resolv/res_hconf.c b/resolv/res_hconf.c
index 73942e8..b9c423e 100644
--- a/resolv/res_hconf.c
+++ b/resolv/res_hconf.c
@@ -410,6 +410,11 @@ _res_hconf_reorder_addrs (struct hostent *hp)
       int sd, num, i;
       /* Save errno.  */
       int save = errno;
+      union
+      {
+	struct sockaddr sa;
+	struct sockaddr_in sin;
+      } ss;
 
       /* Initialize interface table.  */
 
@@ -443,14 +448,14 @@ _res_hconf_reorder_addrs (struct hostent *hp)
 		continue;
 
 	      ifaddrs[new_num_ifs].addrtype = AF_INET;
-	      ifaddrs[new_num_ifs].u.ipv4.addr =
-		((struct sockaddr_in *) &cur_ifr->ifr_addr)->sin_addr.s_addr;
+	      ss.sa = cur_ifr->ifr_addr;
+	      ifaddrs[new_num_ifs].u.ipv4.addr = ss.sin.sin_addr.s_addr;
 
 	      if (__ioctl (sd, SIOCGIFNETMASK, cur_ifr) < 0)
 		continue;
 
-	      ifaddrs[new_num_ifs].u.ipv4.mask =
-		((struct sockaddr_in *) &cur_ifr->ifr_netmask)->sin_addr.s_addr;
+	      ss.sa = cur_ifr->ifr_netmask;
+	      ifaddrs[new_num_ifs].u.ipv4.mask = ss.sin.sin_addr.s_addr;
 
 	      /* Now we're committed to this entry.  */
 	      ++new_num_ifs;