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

[giovannibajo at libero dot it]

------- Additional Comments From giovannibajo at libero dot it  2004-09-12 13:29 -------
(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?

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