This is the mail archive of the
gcc-bugs@gcc.gnu.org
mailing list for the GCC project.
[Bug c/36299] spurious and undocumented warning with -Waddress for a == 0 when a is an array
- From: "manu at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Wed, 2 Mar 2011 10:51:59 +0000
- Subject: [Bug c/36299] spurious and undocumented warning with -Waddress for a == 0 when a is an array
- Auto-submitted: auto-generated
- References: <bug-36299-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36299
--- Comment #8 from Manuel LÃpez-IbÃÃez <manu at gcc dot gnu.org> 2011-03-02 10:51:51 UTC ---
(In reply to comment #7)
> (In reply to comment #6)
> > I think the intention is to warn, at least for a == (void *)0, since the
> > address of a cannot be zero or null. So I would say that this is a regression.
>
> But this is valid in C, and in practice, such a test can occur in macro
> expansions: a macro can check whether some pointer is null before doing
> something with it. There shouldn't be a warning in such a case.
Every warning warns about something valid in C, otherwise it would be an error
not a warning.