FWIW: I've updated some layers with this LAYERSERIES_COMPAT_<layer> today
and I think it's good idea.

It probably won't be enough to stop questions like this:

but it's still better to show warning first and then some often
harder-to-read exception or error log.

Updating layer.conf in meta-qt5 was a bit more tricky as people tend to mix
the meta-qt5 branches with different branches of other layers, just because
their requirements for Qt are often very different than for other layers
(e.g. many people still using meta-qt5/krogoth with Qt 5.6 because of the
license, even with much newer morty, pyro, rocko, sumo, master branches of
other layers and vice versa that someone is stuck with krogoth release for
whatever reason, but needs newer LTS Qt 5.9 from meta-qt5/rocko). So for
meta-qt5 I've used multiple values for LAYERSERIES_COMPAT_<layer> for
combinations I use somewhere (so that I cover at least some testing with
such uncommon combination) and I'm willing to accept more values to it if
someone really uses another combination regularly. The rest of combination
(like meta-qt5/krogoth with dizzy, which is usable as described in meta-qt5
commits which introduced incompatiblitites, will eventually trigger the
warning which is fine, because people should be aware that they are doing
something less tested and that they might to implement some work arounds to
make it usable).


On Fri, Apr 6, 2018 at 5:29 PM, Richard Purdie <
richard.pur...@linuxfoundation.org> wrote:

> On Fri, 2018-04-06 at 10:16 -0400, Trevor Woerner wrote:
> > A) Some layers only switch to an official branch name when the find a
> > reason to. E.g. branch "sumo" is created on openembedded-core but
> > meta-A keeps working on master unless an incompatible change is
> > created in openembedded-core that forces meta-A to create a "sumo"
> > branch.
> >
> > B) Other layers create official branches the moment they exist. E.g.
> > branch "sumo" is created on openembedded-core and meta-B instantly
> > creates a "sumo" branch to mark this point in time, and continues
> > working on master. If meta-B's "sumo" branch fails to build against
> > openembedded-core's "sumo" branch because an incompatible change is
> > made to openembedded-core's sumo branch, meta-B fixes the issue on
> > the sumo branch.
> >
> >
> > I can see how the change you've implemented will be very useful for
> > the A)
> > cases. Will it be needed for the B) cases? In other words, does the
> > code
> > you're adding implicitly assume:
> >
> >       LAYERSERIES_COMPAT_<...> = "layer"
> >
> > for any given "layer"?
> No, there is no implicit assumption.
> In both A) and B) cases the maintainer adds the new "codename" to the
> list of compatible layer series in LAYERSERIES_COMPAT_<layer> for their
> layer. They can list multiple layers in there, e.g. "rocko sumo".
> The one annoying thing about all this is the layer maintainers do have
> to update layer.conf each time a new release codename comes out. I
> think that is a reasonable compromise to be able to give users a much
> better idea of which layers are compatible or incomaptible with their
> setup though. It means someone has looked at it and believes it will
> work with a given release series.
> Just to be clear, "layer" would never be a valid value there, it will
> always be the release/branch codenames.
> Cheers,
> Richard
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