Re: [Qemu-devel] [BUG QEMU 1.1] virtio-9p-handle does not compile

[Stefan Weil <sw@weilnetz.de>]

Am 06.06.2012 19:49, schrieb Serge Hallyn:
> Quoting Stefan Weil (sw@weilnetz.de):
>> The patch will fix the compiler error messages, but will the
>> resulting code work? Maybe it has runtime dependencies
>> (Linux kernel?) which should be checked at runtime.
>>
>> Would an enhanced test in configure be a better solution?
>> It could disable VirtFS automatically if the definitions
>> are missing.
>>
>> On Ubuntu Lenny, there is no definition for AT_EMPTY_PATH,
> (Debian Lenny I presume)

Sorry, my mistake. I meant Ubuntu Lucid.

> True, the flag is newer than I thought.  How could the configure option
> be enhanced?  Could we simply grep for it in /usr/include/linux/fcntl.h,
> set an option saying it exists, then still do the #ifndef in
> hw/9pfs/virtio-9p-handle.c?
>
> (The problem is that the glibc and linux headers are currently not
> compatible...  a separate problem, yes, but one I can't currently
> overcome AFAIK)

I'd use virtio-9p-handle only if AT_EMPTY_PATH is defined without
requiring a hack like using linux/fcntl.h.

configure can check that. Should I send a patch which does this check?

Regards,
Stefan W.