Patch for undefined behaviour in gcc

[Ulrich Drepper]

Andreas Jaeger <aj@suse.de> writes:

> Neil has implemented a new cpp which warns about (see gcc-patches, the
> patch is not in yet, I'm just testing it):
> o A new diagnostic: the "defined" operator resulting from a macro
> expansion in a preprocessor conditional (undefined behaviour according
> to the standard).
> 
> Here's a patch to get rid of these warnings.  Ok, to commit?

I don't like this a bit.  They are once more removing very useful and
currently well supported functionality.  If I'm not asking about
warnings for standard compliance I don't want to see warnings like
this.  Glibc cannot compiled without gcc so it is perfectly fine to
use gcc features.  And we already do.

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