I'll apply this as obvious after including it in a bootstrap / regtest.
2012-03-07 Richard Guenther <rguent...@suse.de>
* c-typeck.c (pointer_diff): Use c_common_type_for_size.
--- gcc/c-typeck.c (revision 185029)
+++ gcc/c-typeck.c (working copy)
@@ -3413,8 +3410,7 @@ pointer_diff (location_t loc, tree op0,
be the same as the result type (ptrdiff_t), but may need to be a wider
type if pointers for the address space are wider than ptrdiff_t. */
if (TYPE_PRECISION (restype) < TYPE_PRECISION (TREE_TYPE (op0)))
- inttype = lang_hooks.types.type_for_size
- (TYPE_PRECISION (TREE_TYPE (op0)), 0);
+ inttype = c_common_type_for_size (TYPE_PRECISION (TREE_TYPE (op0)), 0);
inttype = restype;