[Bug c/23577] spurious warnings about unhandled cases in switches (need VRP and control flow in front-end)

[egallager at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=23577

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

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

--- Comment #3 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #1)
> The warning is done without flow control.
> 
> The optmization needs a "full" VRP which keeps of track of discontinuous
> ranges which is too expensive 
> really.

...maybe once Project Ranger is merged and we have that info available
on-demand it'll be easier?