Re: KVM-16 compiled against GCC 4

Anthony Liguori
2007-03-19T15:48:07Z

Anthony Liguori wrote:
> David Duardo wrote:
>> There seems to be a bug in the generated file qemu/i386-softmmu/op.h
>> when compiling kvm-16 against GCC 4.
>>
>> If you apply the two GCC 4 patches to the kvm-16 source:
>>
>> 1) http://www.busybox.net/downloads/qemu/qemu-gcc-4-all.patch
>> 2)
>> http://www.kju-app.org/proj/browser/trunk/patches/qemu-0.9.0-gcc4.patch
>>
>> and try to compile against GCC 4 you'll get a symbol redefinition error.
>>
>> The solution is to remove all "extern char mempy;" lines in
>> qemu/i386-softmmu/op.h
>>
>> So far kvm has been running very stable with the only problem being the
>> known reboot bug.
>>
>> My question is where exactly is qemu/i386-softmmu/op.h being generated?
>> I want to patch the problem before it gets generated.
>>
>
> dyngen generates op.h from ops.o
>
> One thing I was thinking about last night, was that there is really no
> reason why i386-softmmu/op.h cannot be put into version control.

Scratch that. We would still need op.o.

Regards,

Anthony Liguori

> That would eliminate the need for gcc-3 while also not sacrificing
> functionality. You would only need gcc-3 if you wanted to hack
> directly on the code translator (which is presumably few people).
>
> Of course, this is only useful for KVM (since it can assume an i386
> host) but it's less invasive than my previous approach.
>
> Regards,
>
> Anthony Liguori
>
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