[Spice-devel] [PATCH spice-streaming-agent 2/3] Change numbering schema

[Christophe Fergeau]

On Wed, Apr 18, 2018 at 12:47:42PM +0100, Frediano Ziglio wrote:
> From: Christophe de Dinechin <dinechin at redhat.com>
> 
> A major.minor numbering scheme is not ideal for ABI checks.
> In particular, it makes it difficult to react to an incompatibility
> that was detected post release.
> 
> [More info]
> 
> The major.minor numbering scheme initially selected makes it harder
> to fixes cases where an incompatibility was detected after release.
> 
> For example, the major.minor version checking assumes that agent 1.21
> is compatible with plugins 1.21, 1.13 or 1.03. If later testing
> shows that 1.13 actually introduced an incompatiliy, you have to
> special-case 1.13 in the compatibiliy check.
> 
> An approach that does not have this problem is to rely on incremented
> version numbers, with a "current" and "oldest compatible" version
> number. This is used for example by libtools [1].
> 
> Since the change required for #1 and #2  introduces an ABI break,
> it is as good a time as any to also change the numbering scheme,
> since changing it later would introduce another unnecessary ABI break.

Fwiw, I'm not sure yet I fully understand the rationale behind this, and
the various pros and cons
(see https://lists.freedesktop.org/archives/spice-devel/2018-April/042956.html
and https://lists.freedesktop.org/archives/spice-devel/2018-April/043175.html)
The rationale mentioned in
https://lists.freedesktop.org/archives/spice-devel/2018-April/043151.html
would probably be good to have here if we decide to go with this
versioning.

Christophe
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