[Bug middle-end/50199] [4.7 Regression] wrong code with -flto -fno-merge-constants

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50199

--- Comment #5 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-12-08 15:02:34 UTC ---
Created attachment 26022
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=26022
gimple predicate patches

GIMPLE predicate patches - that will now commit STRING_CSTs to a local
temporary via the

static enum gimplify_status
gimplify_addr_expr (tree *expr_p, gimple_seq *pre_p, gimple_seq *post_p)
{
...
    default:
      /* We use fb_either here because the C frontend sometimes takes
         the address of a call that returns a struct; see
         gcc.dg/c99-array-lval-1.c.  The gimplifier will correctly make
         the implied temporary explicit.  */

      /* Make the operand addressable.  */
      ret = gimplify_expr (&TREE_OPERAND (expr, 0), pre_p, post_p,
                           is_gimple_addressable, fb_either);

which is of course bogus.