Second Kinetic Kudu test rebuild

[Steve Langasek]

On Tue, Sep 20, 2022 at 12:16:37PM +0200, Christian Ehrhardt wrote:

> But by the related discussions it seems pgsql isn't ready for llvm-15 yet
> and changing the symbol to overcome the build error might lead to more
> subtle and sinister issues later on.
> I guess to avoid unknown further fallout in Kinetic, instead of trying
> to fix the bug in pgsql partially to fail later it is better - for now - to
> change the pgsql build dependency to llvm-14-dev.
> AFAICS libllvm14 + libllvm15 are in main in Kinetic still and postgres as
> well as maybe others will need to stick with the safer one for now.

> For a minimal rant, postgresql just moved to llvm 14, also in Debian llvm-15
> is only in experimental. Who knows how many more subtle changes there are
> breaking things (also in other packages). It might have been a bit too
> aggressive to move that into kinetic-release so much after feature
> freeze ([5] shows 14th Sept). It seems to be the same core-lib/toolchain
> discussion we have too often.

The rationale for allowing late landing of llvm-defaults to date has been
that almost no packages in the archive build-depend on the unversioned
-defaults packages *because* the behavior changes frequently in incompatible
ways.  It is thus not realistic that we ship only one version of
llvm-toolchain in a release (despite the small number of
reverse-build-dependencies vs gcc), and the target of -defaults matters much
less.

We should make it a condition of this late landing that
reverse-build-dependencies of llvm-defaults get build-tested after the
update, and any that prove incompatible move to a versioned build-dep.

As far as this being experimental-only, there are lots of reasons why a
package might be in experimental that may or may not be relevant to Ubuntu.
It is not experimental upstream but has had its GA release, and that's the
version that we have in kinetic.

-- 
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                                   https://www.debian.org/
slangasek at ubuntu.com                                     vorlon at debian.org
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