Changes to build-dependency handling in Ubuntu xenial beyond

[Steve Langasek]

Hi Thomas,

On Mon, Apr 18, 2016 at 02:00:43PM -0400, Thomas Ward wrote:
> On 04/08/2016 12:39 PM, Steve Langasek wrote:

> > Thanks to some stellar work by Dimitri Ledkov and Colin Watson, and as
> > discussed on ubuntu-devel over the past couple of months[1,2], a change has
> > been landed to Launchpad and the archive reports[3] to allow packages in
> > main to build-depend on universe (and packages in restricted to build-depend
> > on either universe or multiverse).

> > What this means for you:

> >  - If you are building packages locally, you will want to update your build
> >    environments for xenial and beyond to include universe in the apt
> >    sources, to mirror Launchpad's behavior.

> >  - If you are updating a package that carries a delta to its
> >    build-dependencies, you will want to check if this delta can now be
> >    dropped.  If readding the build-dependency results in a new runtime
> >    dependency, the package will be blocked by proposed-migration in
> >    -proposed until component mismatches are resolved; you will then need
> >    to either re-add the delta, or follow the MIR process[4].

> I think I need some clarification on this point.  The way I interpret
> this is as follows:

>  1. We are able to build-depend packages in Main on Universe, such that
>     any Universe compile-time dependencies are no longer needed to be
>     dropped for a package to be in Main.  But...

>  2. If such build-dependencies then introduce new dependencies on the
>     built binaries, the runtime-dependency packages of which are
>     necessary in the built binaries must be in Main.

> Is this an accurate interpretation of the points made in your email, or
> am I misreading what you are stating?

You've got it exactly.

-- 
Steve Langasek                   Give me a lever long enough and a Free OS
Debian Developer                   to set it on, and I can move the world.
Ubuntu Developer                                    http://www.debian.org/
slangasek at ubuntu.com                                     vorlon at debian.org
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