GNU bug report logs - #65464
Emacs 29.1 - VHDL mode missing updates…

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From: Mattias Engdegård <mattias.engdegard <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: Reto Zimmermann <reto <at> gnu.org>, 65464 <at> debbugs.gnu.org, Stefan Monnier <monnier <at> iro.umontreal.ca>, Stefan Kangas <stefankangas <at> gmail.com>
Subject: bug#65464: Emacs 29.1 - VHDL mode missing updates… 
Date: Mon, 11 Sep 2023 18:21:55 +0200

> Does this mean the answer to Reto's question is "yes, it's a known problem for which we have no solution"?

That's right, assuming the question was about packages that were byte-compiled on newer Emacs versions than they are used on. Changes to Emacs are usually backward-compatible with respect to .elc files, but there is never guarantee that they are forward-compatible.

This is not just a matter of changes to the byte-code compiler and interpreter but more often about changes to macros.

In other words, if someone is unable to run vhdl-mode.elc from Emacs 29 on Emacs 28, then we're very sorry but do not consider it a defect that needs to be remedied.

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