[Bug c/36299] spurious and undocumented warning with -Waddress for a == 0 when a is an array

["vincent at vinc17 dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #3 from vincent at vinc17 dot org  2008-08-23 20:00 -------
(In reply to comment #2)
> this warning was added on purpose, because probably someone requested it. I
> don't see that it is very different from the documented case of using the
> address of a function in a conditional.

The documentation should be improved anyway (the word "suspicious" is very
subjective).

> You should be able to work-around the macro case by casting the array to (char
> *) or perhaps casting to (void *) ?

Yes, this makes sense. Perhaps this should be documented.

> That said, we would like to not warn within
> macros for a wide range of warnings but we don't have the infrastructure to do
> that yet.

How about something like __extension__, e.g. __no_warnings__ would disable the
warnings for the following statement or expression? If expression, one could
still use __no_warnings__ with ({ ... }). Keywords for individual warnings or
warning groups would even be better. At the same time, it would be nice to have
some macro defined, declaring that such a keyword is available (that would be
much better than testing the GCC version).


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36299