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Date: Thu, 22 Jul 2010 01:45:01 +0100
From: Jamie Lokier <jamie@shareable.org>
Subject: Re: [Qemu-devel] [PATCH] move 'unsafe' to end of caching modes in help
Message-ID: <20100722004501.GK14589@shareable.org>
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To: Anthony Liguori <anthony@codemonkey.ws>
Cc: qemu-devel@nongnu.org, Bruce Rogers <brogers@novell.com>

Anthony Liguori wrote:
> On 07/21/2010 04:58 PM, Daniel P. Berrange wrote:
> >>Yes there is.  Use the version number.
> >>     
> >The version number is not suitable, because features can be removed at
> >compile time and/or
> 
> I don't see any features that libvirt would need to know about that are 
> disabled at compile time that aren't disabled by platform features (i.e. 
> being on a Linux vs. Windows host).
> 
> >  added via patch backports.
> 
> If a distro backports a feature, it should change the QEMU version 
> string.  If it doesn't, that's a distro problem.

To what version?  It can't use the newer version if it only backports
a subset of features; it would have to use a distro-specific version
number or a version string that somehow encodes feature independent of
the version number itself, by some agreed libvirt standard.  Which
isn't far off advertising features in the help string :-)

-- Jamie