A final round of buster updates for the Clojure team

[Elana Hashman]

Greetings programs!!

Clojure is looking good for the buster release. We will be releasing
with:

- Clojure 1.10.0
- Leiningen 2.9.0
- Various supporting libraries and dependencies

Additionally, I have successfully gotten clojure1.8 removed from
testing, so we won't have to maintain multiple versions of Clojure in
buster. Huzzah!

What's next, if anything?

Rob has pointed out that Clojure 1.10 has experienced a performance
regression on JDK11, which seems to be getting patched in the 1.10.1
release. However, that release is not yet available; currently only the
preview build 1.10.1-beta2 is out. It is possible (likely?) that 1.10.1
will not be released in time for buster.

Here is some of our IRC banter on the subject for the record:

13:49 < rlb> ehashman: fwiw, looks like they maybe they did fix it.  Invoking 
             1.10.1-beta2 clojure.main via a lein dummy app uberjar:
13:49 < rlb> $ cljr10
13:49 < rlb> Clojure 1.10.1-beta2
13:49 < rlb> user=> 
13:49 < rlb>  
13:49 < rlb> $ time cljr10 -e ''
13:49 < rlb> real    0m0.476s
13:49 < rlb> user    0m0.905s
13:50 < rlb> sys     0m0.089s
13:50 < rlb>  
13:50 < rlb> For the current debian 1.10 it's 1.8s.
15:16 < ehashman> I think this is the perf regression: 
                  https://dev.clojure.org/jira/browse/CLJ-2484
15:18 < ehashman> (I'm looking at 
                  https://clojure.org/community/devchangelog#_release_1_10_1 )

I think it is likely that we will *not* be able to take the patch for
buster, but wanted to let the team know. If it was possible, this
performance regression fix would be the last Clojure change targeted for
buster, assuming the upstream release comes out on a schedule that works
for the release team. I have no idea when 1.10.1 is coming out, but
based on previous release schedules, since a release candidate isn't
even available yet, I think it will be over a month.

I do not want to try cherry-picking the performance fix while ignoring
the rest of the upstream changes---while the patch is available on the
JIRA I linked above, I don't know if it will apply cleanly to 1.10.0 and
it's quite involved (>100 lines) so I don't want to accidentally
introduce a regression or incompatibility with upstream.


Until next time,

- e
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