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Subject: Re: [Qemu-devel] TCG/GCC breakage
From: Paul Bolle <pebolle@tiscali.nl>
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Date: Wed, 11 Mar 2009 11:34:29 +0100
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To: Glauber Costa <glommer@gmail.com>
Cc: qemu-devel@nongnu.org

On Wed, 2009-03-11 at 00:40 -0300, Glauber Costa wrote:
> I'm seeing a strange behaviour here using qemu-system-x86_64
> (kvm not even compiled in) on an i386 host

For what it's worth, the same seems to happen here with an i386 guest on
an i386 host.

> I get segfaults very early in execution, and after some investigation,
> I figured out that ebp register is corrupted. I can't determine where
> the corruption starts.
> 
> I then did rm x86-64-softmmu/op_helper.o; make CC=gcc34, so only this
> file get compiled by an older gcc, and it worked again.

If I compile (i386-softmmu/qemu and thus) i386-softmmu/op_helper.o with
Fedora rawhide's current gcc (i.e. 4.4.0 20090307 (Red Hat 4.4.0-0.23))
qemu segfaults very early too. If I recompile just that file with gcc34
(i.e, 3.4.6 20060404 (Red Hat 3.4.6-13)) qemu does not segfault very
early anymore.


Paul Bolle