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[Qemu-devel] GCC 4 patches
From: |
Gwenole Beauchesne |
Subject: |
[Qemu-devel] GCC 4 patches |
Date: |
Mon, 14 Nov 2005 17:01:59 +0100 (CET) |
Hi,
The following patches makes it possible to build QEMU with GCC 4 on x86.
However, there is still a problem with x86_64-softmmu. It may be a genuine
GCC bug though I don't see what's wrong with do_interrupt_real(). IOW, if
I build this function with GCC 3.3, x86_64-softmmu works fine, otherwise
QEMU hangs early. That's with GCC 4.0.3. With GCC 4.0.1, the problem looks
elsewhere, namely cpu-exec.c needs to be compiled with GCC 3 to work...
Anyhow, I am listing the current patches so that a GCC 4 compiled
i386-softmmu binary works. Sorry, I don't have the time to look further
the x86_64-softmmu problems.
Patches are available at:
<http://cvs.mandriva.com/cgi-bin/cvsweb.cgi/contrib-SPECS/qemu/>
* qemu-0.7.0-gcc4.patch
Original patch from Paul Brook + an addition to correctly decode imul.
* qemu-0.7.2-dyngen-check-stack-clobbers.patch
Check stack is not clobbered in synthetic opcodes using GOTO_LABEL_PARAM
[ this might exhibit a gcc4 performance regression though, insofar as
gcc4 feels the need to generate stack variables ]
* qemu-0.7.2-gcc4-hacks.patch
Various workarounds to GCC ICEs.
* qemu-0.7.2-gcc4-opts.patch
Don't generate stack variables for x86_64-softmmu case in functions
using GOTO_LABEL_PARAM.
IMHO, it's not worth looking hard at compiling QEMU with GCC 4 on x86. The
new hand written backend is a better alternative.
Bye,
Gwenolé.
- [Qemu-devel] GCC 4 patches,
Gwenole Beauchesne <=