[Bug c/17426] Emit mandatory warning for manual expansions of offsetof

[egallager at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=17426

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

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

--- Comment #6 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Giovanni Bajo from comment #3)
> (In reply to comment #2)
> 
> > it's only where an integer constant expression is 
> > required, as in bug 17396 (static array dimension) or for case labels, 
> > enum values, bit-field widths, null pointer constants, designators for 
> > array initializers, that there's a problem.
> 
> Thanks for the list. I will try to activate the warning in these contexts,
> but 
> I do not know the C frontend, so maybe I'll need to do this incrementally.
> 
> > fits the long-established 
> > GCC extension of symbolic difference constant expressions if being used in 
> > a static initializer
> 
> This could be a pedwarn, then, right?

Are you still working on this?