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bug#62762: 'make' often errors with "Org version mismatch" after pulling


From: Max Nikulin
Subject: bug#62762: 'make' often errors with "Org version mismatch" after pulling a new version of the code
Date: Fri, 5 May 2023 22:33:48 +0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.10.0

On 05/05/2023 18:33, Eli Zaretskii wrote:
Date: Fri, 5 May 2023 18:20:09 +0700 From: Max Nikulin
On 05/05/2023 17:38, Eli Zaretskii wrote:
This doesn't work in Emacs, in general, due to circular dependencies.

Eli, I am still unable to associate this with particular cases of elisp code or with how it is split over several files. That is why I am again asking for examples illustrating issues you have in mind.

What do you mean by "unavoidable"?

Max Nikulin Fri, 5 May 2023 11:18:17 +0700
In the C and C++ world the solution for cyclic dependencies is forward
declarations. Some kind of such approach I see in Org as well.
lisp/org/ol.el and lisp/org/org-element.el are mutually dependent.
org-element.el requires 'ol, while the latter just declares functions
from 'org-element.

If it's this part, then I don't see how it can be relevant to our
case: our problem is to teach Make about these dependencies, not to
teach a Lisp compiler about them.

I can not figure out which kind of cyclic dependencies may cause troubles with dependency generation, but I had a hope that it would be possible to reorganize code to avoid such kind of dependencies.

I don't have ready examples off the top of my head, sorry.  You have
the Emacs Lisp sources, so you have all the information, and can find
those circular dependencies yourself if you don't believe me and
Stefan.

It might be even better if you will provide a brief example unrelated to real Emacs code. I have no idea which code I should search for.





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