Re: gcc build warnings at -O3

On Wed, Feb 7, 2024 at 10:31 PM Andres Freund <andres@anarazel.de> wrote:
> On 2024-01-11 21:55:19 -0500, Tom Lane wrote:
> > Bharath Rupireddy <bharath.rupireddyforpostgres@gmail.com> writes:
> > > Hi, I'm seeing a compiler warning with CFLAGS -O3 but not with -O2.
> >
> > > In file included from dbcommands.c:20:
> > > dbcommands.c: In function ‘createdb’:
> > > ../../../src/include/postgres.h:104:16: warning: ‘src_hasloginevt’ may
> > > be used uninitialized in this function [-Wmaybe-uninitialized]
> >
> > Hmm, I also see that at -O3 (not at -O2) when using Fedora 39's
> > gcc 13.2.1, but *not* when using RHEL8's gcc 8.5.0.
>
> It's visible here with gcc >= 10. That's enough versions that I think we
> should care.  Interestingly enough, it seems to have recently have gotten
> fixed in gcc master (14 to be).

I managed to reproduce this warning locally.  Fixed.

------
Regards,
Alexander Korotkov