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Re: Adding ELPA to Emacs core

From: Stefan Monnier
Subject: Re: Adding ELPA to Emacs core
Date: Tue, 13 Mar 2018 17:16:40 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux)

> One issue with my branch so far is that the packages that I have copied
> into the build become built-in, and package.el doesn't see versions on
> ELPA as upgrades.

This is normally done via package--builtin-versions, set in loaddefs.el,
generated from lisp/emacs-lisp/autoload.el.

> Say Emacs-27 bundles bob-3.1.el which is also in ELPA. Now bob-4.1.el is
> released which is an upgrade. So surely Emacs-27 should offer to update?
> But, then bob-5.1.el comes out along with Emacs-28 and bob-5.1.el does
> not support Emacs-27. Now Emacs-27 should no longer install
> bob-5.1.el. But surely, it should allow installation of bob-4.1.el.

This problem is not specific to "Emacs with ELPA packages", tho.

But yes, it's a problem that would be good to fix.


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