Yet another workaround for GArray's bad data type choice.

svn path=/trunk/; revision=21626

epan/dissectors/packet-rmt-norm.c

@@ -227,7 +227,24 @@ static guint dissect_norm_hdrext(struct _norm *norm, struct _fec_ptr *f, proto_t
 
 		/* Add the extensions to the subtree */
 		for (i = 0; i < ext->len; i++) {
-			struct _ext *e = &g_array_index(ext, struct _ext, i);
+			/*
+			 * The data member of a GArray isn't a void *, as
+			 * it should be; it's a guint8 *, so GCC will
+			 * warn about attempts to cast it to the type of
+			 * an array member if -Wcast-align is specified.
+			 *
+			 * The code in GLib that allocates the data
+			 * presumably arranges that it's aligned
+			 * strictly enough for any data type (as that's
+			 * how most memory allocators work), so that warning
+			 * is bogus.
+			 *
+			 * We work around this by not using g_array_index(),
+			 * but doing the indexing ourselves, and casting
+			 * to the data pointer to void * first.
+			 */
+			struct _ext *ext_array = (void *)ext->data;
+			struct _ext *e = &ext_array[i];
 
 			lct_ext_decode(e, &lctp, tvb, ext_tree, ett.hdrext, *f);
 			/* fec_decode_ext_fti(e, tvb, ext_tree, ett.hdrext, *f); */