Date: Wed, 17 Mar 2004 22:03:07 +0200 From: Ruslan Ermilov <ru@freebsd.org> To: Dag-Erling Sm?rgrav <des@des.no> Cc: FreeBSD Tinderbox <tinderbox@freebsd.org> Subject: Re: [current tinderbox] failure on ia64/ia64 Message-ID: <20040317200307.GA46126@ip.net.ua> In-Reply-To: <20040317113931.GF49920@ip.net.ua> References: <20040317040254.386947303A@freebsd-current.sentex.ca> <xzpad2fhixn.fsf@dwp.des.no> <20040317113931.GF49920@ip.net.ua>
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On Wed, Mar 17, 2004 at 01:39:31PM +0200, Ruslan Ermilov wrote:
> On Wed, Mar 17, 2004 at 11:22:28AM +0100, Dag-Erling Sm?rgrav wrote:
> > FreeBSD Tinderbox <tinderbox@freebsd.org> writes:
> > > /other/tinderbox/CURRENT/ia64/ia64/src/sys/dev/sound/pci/vibes.c: In =
function `sv_mix_setrecsrc':
> > > /other/tinderbox/CURRENT/ia64/ia64/src/sys/dev/sound/pci/vibes.c:541:=
warning: `i' might be used uninitialized in this function
> > > *** Error code 1
> >=20
> > Now that is wierd... and I can't reproduce it. There is no way i can
> > be used uninitialized, it is not referenced anywhere outside this
> > loop:
> >=20
> > for(i =3D 0; i < SOUND_MIXER_NRDEVICES; i++) {
> > if ((1 << i) & mask) {
> > v |=3D mt[i].iselect;
> > }
> > }
> >=20
> > If the problem persists, we'll have to conclude that gcc is broken
> > somehow.
> >=20
> I cannot reproduce it either, but perhaps this is the same reason why
> we still have -Wno-uninitialized in <bsd.sys.mk> for normal WARNS
> levels.
>=20
Actually, this is easily reproduceable by compiling the corresponding
module on pluto1 with CFLAGS=3D"-O2 -pipe" set in environment. There's
clearly a bug in gcc(1), as:
- substituting 2 instead of SOUND_MIXER_NRDEVICES in the line below
makes it compile without a warning;
for(i =3D 0; i < SOUND_MIXER_NRDEVICES; i++) {
- Bumping it to 3 or greater gives this mis-warning.
Cheers,
--=20
Ruslan Ermilov
FreeBSD committer
ru@FreeBSD.org
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