On 8/31/2020 8:39 PM, Andrew Schulman via Cygwin wrote:
There is unfortunately another layer of incompatibility in Unison: Two
Unison executables are only compatible if they were built with the same
version of OCaml.
What a mess!
Glad you understand :)
Would you consider embedding the OCaml version in the package name
as suggested by the Debian maintainer
(http://lists.seas.upenn.edu/pipermail/unison-hackers/2020-August/001975.html)?
Thus unison2.48-2.48.4-1 would be replaced by something like
unison2.48+4.04.1... and unison2.48-2.48.4-2 would be replace by something like
unison2.48+4.08.1.... That way people who are happy with unison2.48-2.48.4-1
can keep using it without being pestered by setup to update.
Yes, I could do that. I was hoping to avoid it, but it may be the only realistic
solution.
It may be mainly Unison 2.48 that's affected, and maybe also 2.51 and the
forthcoming 2.52. I guess that very few people are still using the older
versions, and if they are they don't want any changes now.
FWIW, here's my situation, which is probably not typical. When you released
unison2.48-2.48.4-1 a few years ago, it was incompatible with the Linux server
that I sync with. So I simply built OCaml and unison myself on that server,
using the same versions that you used, and installed unison in my own ~/bin
directory.
I could do that again, now using OCaml 4.08.1. But I'd much rather just keep my
current arrangement, without having setup try to update unison2.48 every time I
run it.
Thanks, that's helpful to know. Your situation might not be unusual, I don't
know. For all I know, you and I are the only Cygwin Unison users.
So was unison2.48-2.48.4-1 built with OCaml 4.04.1? I don't remember, and I'm
not sure how to tell.
I just checked a Cygwin snapshot from around the time unison2.48-2.48.4-1 was
built
(http://ctm.crouchingtigerhiddenfruitbat.org/pub/cygwin/circa/64bit/2017/02/22/131407/index.html),
and it looks like the current version of Cygwin's OCaml was 4.02.3 at the time.
I mentioned 4.04.1 above because that's the version I built for Linux. So maybe
the crucial thing is that it was pre-4.08.1.
Ken
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