re PR c/12373 (ICE when generating RTX on valid code)

	PR c/12373
	* c-typeck.c (tagged_types_tu_compatible_p): Don't use
	DECL_ORIGINAL_TYPE if there isn't one.

From-SVN: r79759

gcc/ChangeLog

+2004-03-20  Ian Lance Taylor  <ian@wasabisystems.com>
+
+	PR c/12373
+	* c-typeck.c (tagged_types_tu_compatible_p): Don't use
+	DECL_ORIGINAL_TYPE if there isn't one.
+
 2004-03-20  Kazu Hirata  <kazu@cs.umass.edu>
 
 	* fold-const.c (fold): Replace "final_type" with "type".

gcc/c-typeck.c

@@ -674,10 +674,14 @@ tagged_types_tu_compatible_p (tree t1, tree t2, int flags)
      is harder than it looks because this may be a typedef, so we have
      to go look at the original type.  It may even be a typedef of a
      typedef...  */
-  while (TYPE_NAME (t1) && TREE_CODE (TYPE_NAME (t1)) == TYPE_DECL)
+  while (TYPE_NAME (t1)
+	 && TREE_CODE (TYPE_NAME (t1)) == TYPE_DECL
+	 && DECL_ORIGINAL_TYPE (TYPE_NAME (t1)))
     t1 = DECL_ORIGINAL_TYPE (TYPE_NAME (t1));
 
-  while (TYPE_NAME (t2) && TREE_CODE (TYPE_NAME (t2)) == TYPE_DECL)
+  while (TYPE_NAME (t2)
+	 && TREE_CODE (TYPE_NAME (t2)) == TYPE_DECL
+	 && DECL_ORIGINAL_TYPE (TYPE_NAME (t2)))
     t2 = DECL_ORIGINAL_TYPE (TYPE_NAME (t2));
 
   /* C90 didn't have the requirement that the two tags be the same.  */