[Bug target/50009] [4.7 Regression] Segmentation fault in tree_nop_conversion

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50009

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2011.08.08 09:57:48
          Component|c                           |target
   Target Milestone|---                         |4.7.0
     Ever Confirmed|0                           |1

--- Comment #1 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-08-08 09:57:48 UTC ---
It seems that the stor-layout code assumes fields have complete types - they
do not, in case of flexible trailing array members.

  if (targetm.ms_bitfield_layout_p (rli->t))
    {
      /* Here, the alignment of the underlying type of a bitfield can
         affect the alignment of a record; even a zero-sized field
         can do this.  The alignment should be to the alignment of
         the type, except that for zero-size bitfields this only
         applies if there was an immediately prior, nonzero-size
         bitfield.  (That's the way it is, experimentally.) */
      if ((!is_bitfield && !DECL_PACKED (field))
          || (!integer_zerop (DECL_SIZE (field))

now, the STRIP_NOPS in integer_zerop is odd as well.