[Bug tree-optimization/84047] [6/7/8 Regression] missing -Warray-bounds on a negative offset into a string

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84047

Martin Sebor <msebor at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |diagnostic
      Known to work|                            |4.5.4
           See Also|                            |https://gcc.gnu.org/bugzill
                   |                            |a/show_bug.cgi?id=83776
            Summary|missing -Warray-bounds on a |[6/7/8 Regression] missing
                   |negative offset into a      |-Warray-bounds on a
                   |string                      |negative offset into a
                   |                            |string
      Known to fail|                            |5.4.0, 6.4.0, 7.2.0, 8.0

--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
The root cause of this regression is different from that of pr83776.  Bisection
leads to r161655 (committed in the GCC 4.6.0 cycle):

r161655 | rguenth | 2010-07-01 04:49:19 -0400 (Thu, 01 Jul 2010) | 341 lines

2010-07-01  Richard Guenther  <rguenther@suse.de>

        PR middle-end/42834
        PR middle-end/44468