[Bug bootstrap/86518] Strengthen bootstrap comparison by not enabling warnings at stage3

[egallager at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86518

Eric Gallager <egallager at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |egallager at gcc dot gnu.org

--- Comment #2 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Alexander Monakov from comment #0)
> I tried leaving only -Wno-narrowing in warning flags and got many comparison
> failures

For maximum differences, we should switch to -Wnarrowing in the previous stage
so that there's a point in explicitly disabling it in the next one.