Date: Mon, 11 Dec 2000 11:14:35 -0800 From: "David O'Brien" <obrien@freebsd.org> To: Mark Powell <M.S.Powell@salford.ac.uk> Cc: freebsd-stable@freebsd.org Subject: Re: Different gcc optimisations cause IP packet CRC problems Message-ID: <20001211111434.A98131@dragon.nuxi.com> In-Reply-To: <Pine.BSF.4.21.0012111544260.36265-100000@plato.salford.ac.uk>; from M.S.Powell@salford.ac.uk on Mon, Dec 11, 2000 at 03:45:02PM %2B0000 References: <20001211103638.A21163@peitho.fxp.org> <Pine.BSF.4.21.0012111544260.36265-100000@plato.salford.ac.uk>
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On Mon, Dec 11, 2000 at 03:45:02PM +0000, Mark Powell wrote:
> > No, but you may want to review the mailing list archives since GCC
> > optimization problems have been rehash many times (see also the notes
> > in /etc/defaults/make.conf WRT optimization).
>
> I hadn't seen those comments. I didn't think gcc could be *that* broken.
Compiling a kernel is *very* demanding on a C compiler. Linux still uses
2.7.2.3 for their kernel compiler (someone correct me if this is not
still the case). Optimization is a hard science. I don't think anybody
has ever guarenteed 100% correct code with -O2. But if you
can provide a test case showing the optimizer bug, the GCC developers
will fix it.
--
-- David (obrien@FreeBSD.org)
GNU is Not Unix / Linux Is Not UniX
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