[libvirt] [PATCH LIBVIRT] libxl: Use libxentoollog in preference to libxenctrl if available.

[Ian Campbell]

On Mon, 2015-12-14 at 11:15 +0000, Daniel P. Berrange wrote:
> On Thu, Dec 10, 2015 at 11:38:36AM +0000, Ian Campbell wrote:
> > Upstream Xen is in the process of splitting the (stable API) xtl_*
> > interfaces out from the (unstable API) libxenctrl library and into a
> > new (stable API) libxentoollog.
> > 
> > In order to be compatible with Xen both before and after this
> > transition check for xtl_createlogger_stdiostream in a libxentoollog
> > library and use it if present. If it is not present assume it is in
> > libxenctrl.
> 
> Ok, so there's no API changes, just move stuf from one to the other.

Indeed, it should really have been a separate library all along and the API
already setup that way.

I'm working on some other library splits, which will involve API changes,
but AFAIK they are all isolated from libvirt via the use of libxl, so there
should be no churn for you guys other than this one patch.

> > It might be nice to get this into 1.3.0 so that supports Xen 4.7 out
> > of the box? Not sure what the libvirt stable backport policy is but it
> > might also be good to eventually consider it for that?
> 
> We've missed 1.3.0 release, but I'd be ok with adding it to the
> stable branch if that's going to be useful.

I think it would, to allow things to build with Xen 4.7 (when it is
released).

[...]

> Looks, fine from me but will let Jim push it.

Thanks.