PATCH to shorten_compare -Wtype-limits handling

[David Edelsohn]

On Wed, Nov 18, 2015 at 11:26 PM, Jason Merrill <jason@redhat.com> wrote:
> The rs6000 target was hitting a bootstrap failure due to
> -Werror=type-limits.  Since warn_tautological_cmp and other warnings avoid
> warning if one of the operands comes from a macro, I thought it would make
> sense to do that here as well.
>
> Tested that this allows rs6000 bootstrap to proceed, regression tested on
> x86_64-pc-linux-gnu, applying to trunk.  David, do you want to revert the
> #pragma GCC diagnostic change?

Thanks for the patch.

Yes, I will revert the #pragma GCC diagnostic patch.  It was meant as
a temporary hack to fix bootstrap while a long-term solution was
developed.

Thanks, David