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Subject: Re: [ANNOUNCEMENT] unison2.48-2.48.4-2 (Warning: possible breakage)
Date: Mon, 31 Aug 2020 20:39:07 -0400
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From: Andrew Schulman via Cygwin <cygwin AT cygwin DOT com>
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> > 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.

Andrew

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