From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ian Jackson <Ian.Jackson@eu.citrix.com>
Subject: Re: Stabilising some tools only HVMOPs?
Date: Thu, 18 Feb 2016 16:45:00 +0000
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To: Jan Beulich <JBeulich@suse.com>
Cc: Wei Liu <wei.liu2@citrix.com>, Ian Campbell <ian.campbell@citrix.com>, Stefano Stabellini <stefano.stabellini@eu.citrix.com>, Andrew Cooper <andrew.cooper3@citrix.com>, Paul Durrant <Paul.Durrant@citrix.com>, Anthony PERARD <anthony.perard@citrix.com>, Xen-devel <xen-devel@lists.xenproject.org>
List-Id: xen-devel@lists.xenproject.org

Jan Beulich writes ("Re: Stabilising some tools only HVMOPs?"):
> On 18.02.16 at 17:28, <Ian.Jackson@eu.citrix.com> wrote:
> > Wei Liu writes ("Re: Stabilising some tools only HVMOPs?"):
> >> I think we come to the conclusion that these HVMOPs should be made
> >> stable. And to do so I'm going to introduce a __XEN_TOOLS_STABLE__ macro
> >> for them to distinguish from __XEN_TOOLS__.  And then libxendevicemodel
> >> will have -D__XEN_TOOLS_STABLE__  only.
> >> 
> >> Does this sound sufficient?
> > 
> > It would be better to rename -D__XEN_TOOLS__ too, to
> > -D__XEN_TOOLS_UNSTABLE.
> 
> Even if a minor one, this will create a compatibility problem for
> out of tree code including the headers: Their builds will all of
> the sudden break, until they figure they need to go and
> #define this new manifest symbol. Otoh maybe we would
> actually like to break their builds this way, to make them aware
> of the fact.

We're talking here mostly about the unstable API, right ?  Well this
is a kind of instability :-).

> In which case maybe __XEN_TOOLS__ should be
> retained for the stable portions?

In principle that might be nice but actually the library split means
they have to change anyway.

Ian.