[Bug target/79671] [7 Regression] mapnik miscompilation on armv7hl since r235622

[rguenther at suse dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79671

--- Comment #95 from rguenther at suse dot de <rguenther at suse dot de> ---
On April 2, 2017 10:54:28 AM GMT+02:00, "bernd.edlinger at hotmail dot de"
<gcc-bugzilla@gcc.gnu.org> wrote:
>https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79671
>
>--- Comment #94 from Bernd Edlinger <bernd.edlinger at hotmail dot de>
>---
>I always wondered why get_alias_set does not use
>the may_alias attribute like this:
>
>
>Index: alias.c
>===================================================================
>--- alias.c     (revision 246605)
>+++ alias.c     (working copy)
>@@ -928,6 +928,9 @@ get_alias_set (tree t)
>       return 0;
>     }
>
>+  if (lookup_attribute ("may_alias", TYPE_ATTRIBUTES (t)))
>+    return 0;
>+
>   /* See if the language has special handling for this type.  */
>   set = lang_hooks.get_alias_set (t);
>   if (set != -1)
>
>this would fix the remaining fall-out.

Because that is not how it was designed or documented to work :)