[Bug ipa/84628] attribute(warning/error) functions should not be merged together

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84628

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Jay from comment #3)
> The original case said something about "localalias" in the error, so aliases
> don't seem to address it. I can dig that up probably.
> 
> Shouldn't it warn for:
>  if (0)
>    banned_function()
> ?
> 
> I believe we want it to.
> You know, strive for equal warnings/errors w/ or w/o optimization, but I
> know that is impossible in general, because optimization==analysis.

The documentation is explicit here though:
" call to such a function is not eliminated through dead code elimination or
other optimizations"