[Bug sanitizer/70712] False positive from AddressSanitizer with use of 'alignas'

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70712

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2016-04-22
     Ever confirmed|0                           |1

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Untested fix:

--- gcc/cfgexpand.c.jj  2016-04-20 03:35:44.000000000 +0200
+++ gcc/cfgexpand.c     2016-04-22 12:22:15.036514839 +0200
@@ -1137,7 +1137,7 @@ expand_stack_vars (bool (*pred) (size_t)
              HOST_WIDE_INT prev_offset
                = align_base (frame_offset,
                              MAX (alignb, ASAN_RED_ZONE_SIZE),
-                             FRAME_GROWS_DOWNWARD);
+                             !FRAME_GROWS_DOWNWARD);
              tree repr_decl = NULL_TREE;
              offset
                = alloc_stack_frame_space (stack_vars[i].size