[Bug bootstrap/97622] ubsan ' unterminated quote character ''' in format

["msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97622

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|INVALID                     |---
           Keywords|                            |diagnostic
                 CC|                            |msebor at gcc dot gnu.org
             Status|RESOLVED                    |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |msebor at gcc dot gnu.org

--- Comment #5 from Martin Sebor <msebor at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #4)
> No.
> If it is the -Wformat-diag warning, just ignore it.  It has been added
> without any attempt to resolve the warnings and warns for many things that
> are just fine.

Without any attempt?  Hardly.  I committed a 12 patch series to resolve most
instances when I introduced the warning:
  https://gcc.gnu.org/pipermail/gcc-patches/2019-May/521567.html
And then proceeded to clean up more here:
  https://gcc.gnu.org/pipermail/gcc-patches/2019-May/522333.html
and more still here:
  https://gcc.gnu.org/pipermail/gcc-patches/2019-June/523281.html

Others have cleaned up a bunch more later that either remained or crept in
because the warning doesn't trigger errors.  See r272607, r272608, r272789,
r273468, r273475, and more.

The few outstanding instances should be fixed and the error suppression for the
warning removed.  The one in comment #0 can be worked around with by making the
quote an argument to a %c.  An an arguably more robust solution would be to
introduce another attribute that doesn't enforce some of the rules for
pp_printf().

Let me take care of this.