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Re: [Qemu-devel] [RFC PATCH v3 00/11] qemu-ga: fsfreeze on Windows using

From: Paolo Bonzini
Subject: Re: [Qemu-devel] [RFC PATCH v3 00/11] qemu-ga: fsfreeze on Windows using VSS
Date: Fri, 24 May 2013 14:08:47 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130514 Thunderbird/17.0.6

Il 24/05/2013 10:59, Stefan Hajnoczi ha scritto:
> On Thu, May 23, 2013 at 03:50:19PM +0200, Paolo Bonzini wrote:
>> Il 23/05/2013 15:28, Stefan Hajnoczi ha scritto:
>>> On Thu, May 23, 2013 at 3:20 PM, Paolo Bonzini <address@hidden> wrote:
>>>> Il 23/05/2013 14:15, Stefan Hajnoczi ha scritto:
>>>>> On Tue, May 21, 2013 at 11:33:33AM -0400, Tomoki Sekiyama wrote:
>>>>>> * How to build & run qemu-ga with VSS support
>>>>>>  - Download Microsoft VSS SDK from:
>>>>>>    http://www.microsoft.com/en-us/download/details.aspx?id=23490
>>>>>>  - Setup the SDK
>>>>>>    scripts/extract-vsssdk-headers setup.exe (on POSIX-systems)
>>>>>>  - Specify installed SDK directory to configure option as:
>>>>>>    ./configure -with-vss-sdk="path/to/VSS SDK" 
>>>>>> --cross-prefix=i686-w64-mingw32-
>>>>> Are there any plans to make this more developer-friendly?  In the Linux
>>>>> world it's unusual to download third-party SDKs; development headers are
>>>>> available as packages from the distro.
>>>>> I haven't looked at the SDK license but hopefully the VSS headers can be
>>>>> added to the mingw cross-build toolchain?
>>>> No, the mingw headers are (re)written by hand, or something like that.
>>>> The VSS license does not permit redistribution. :/
>>> Can we follow the same process for VSS as for the other mingw headers?
>> I have no idea.  Many of them are automatically generated, but some of
>> the others have content seemed non-trivial.
>>> TBH I don't see how one can write them by hand without deriving it
>>> from the SDK, which seems dubious.  But if it worked for the rest of
>>> mingw (which comes with Windows and DirectX headers, for example) then
>>> maybe it can work here too.
>> I'd rather avoid muddy legal waters...
> I'll try to figure out mingw's process.  If mingw has a process that is
> clean, then let's use it for VSS headers too.
> What gives me hope is that mingw headers are shipped by Fedora and
> Debian so the legal situation must be somewhat reasonable.

Yes, but they are done by experienced people.  I'm not sure it would be
the same if done by us.


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