[Bug bootstrap/53963] [4.8 Regression] LTO bootstrap failed with bootstrap-profiled

["hjl.tools at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53963

--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> 2012-07-14 16:52:42 UTC ---
(In reply to comment #1)
> > "--prefix=/usr/local" is the key to trigger this regression.
> > The stage 3 compiler is miscompiled.  Revision 189349 is OK.
> 
> I don' think so. I have configured as
> 
> ../gcc-svn/trunk/configure --with-build-config=bootstrap-lto
> --enable-languages=c

I believe --prefix=/usr/local is the default. I didn't get this
failure with --prefix=/usr/gcc-4.8.0.

> and fails as well. Backing out r189453 works OK.

I am testing reverting:

diff --git a/gcc/gimple.c b/gcc/gimple.c
index 398cb1f..b419591 100644
--- a/gcc/gimple.c
+++ b/gcc/gimple.c
@@ -3422,10 +3422,6 @@ gimple_types_compatible_p_1 (tree t1, tree t2,
type_pair_
t p,
     goto different_types;
     }

-  /* If their attributes are not the same they can't be the same type.  */
-  if (!attribute_list_equal (TYPE_ATTRIBUTES (t1), TYPE_ATTRIBUTES (t2)))
-    goto different_types;
-
   /* Do type-specific comparisons.  */
   switch (TREE_CODE (t1))
     {