From: Lionel Ulmer <lionel.ulmer@free.fr>
To: qemu-devel@nongnu.org
Subject: Re: [SOLVED] Re: [Qemu-devel] Overoptimization
Date: Sat, 29 May 2004 00:15:25 +0200 [thread overview]
Message-ID: <20040529001525.A387@bbland> (raw)
In-Reply-To: <40B743C0.8020003@ums.usu.ru>; from patrakov@ums.usu.ru on Fri, May 28, 2004 at 07:50:56PM +0600
> In fact I just had to read the gcc info page and remove optimizations
> one by one. Result, with gcc 3.3.2:
>
> -Wall -O2 -g -fomit-frame-pointer (defaults) = unsafe,
> -Wall -O2 -g -fomit-frame-pointer -fno-strict-aliasing = safe.
>
> So it looks like slirp code breaks strict aliasing rules assumed by -O2.
> Since the problem has been identified precisely, it has to be fixed in
> qemu CVS.
I think this aliasing stuff will really provoke a LOT of bugs out there for
years to come...
For example, Wine switched to '-fno-strict-aliasing' a long time ago :-)
Lionel
--
Lionel Ulmer - http://www.bbrox.org/
next prev parent reply other threads:[~2004-05-29 2:37 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-05-28 1:19 [Qemu-devel] Overoptimization Alexander E. Patrakov
2004-05-28 10:13 ` Herbert Poetzl
2004-05-28 10:58 ` Alexander E. Patrakov
2004-05-28 11:08 ` Herbert Poetzl
2004-05-28 13:50 ` [SOLVED] " Alexander E. Patrakov
2004-05-28 22:15 ` Lionel Ulmer [this message]
2004-05-29 18:18 ` [Qemu-devel] VNC patch, the 3rd version Johannes Schindelin
2004-05-31 2:00 ` Jim C. Brown
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