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[Bug c/61081] excessive warnings: right-hand operand of comma expression has no effect
- From: "polacek at redhat dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Tue, 06 May 2014 19:03:33 +0000
- Subject: [Bug c/61081] excessive warnings: right-hand operand of comma expression has no effect
- Auto-submitted: auto-generated
- References: <bug-61081-4 at http dot gcc dot gnu dot org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=61081
--- Comment #3 from Marek Polacek <polacek at redhat dot com> ---
On Tue, May 06, 2014 at 06:33:03PM +0000, peter_e at gmx dot net wrote:
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=61081
>
> --- Comment #2 from Peter Eisentraut <peter_e at gmx dot net> ---
> No, these "functions" need to have a usable return value, because someone could
> write
>
> if (!sigemptyset(...))
> weirderror();
So would the following work for you?
#define sigemptyset(set) (__extension__ ({ *(set) = 0; 0; }))