[Bug c/59753] -Woverflow warning inconsistency with signed constant conversion between T_MAX+1 and UT_MAX vs larger than UT_MAX

[manu at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59753

Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:

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

--- Comment #5 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
(In reply to Vincent Lefèvre from comment #4)
> There's still an inconsistency without -Wpedantic, which is the point of
> this bug. I've changed the bug title to:
> 
>   -Woverflow warning inconsistency with signed constant conversion between
> T_MAX+1 and UT_MAX vs larger than UT_MAX

I seem to remember this inconsistency is due to the exact definition of
overflow given in the standard. But I agree that this is confusing for the rest
of humanity who don't know the standard by heart. Also, the warnings would be
useful by default since they are likely mistakes.

> If this inconsistency is intentional, then it should be documented. The
> current behavior doesn't match the documentation:

Agreed.