Re: Problems with desktop.el after reecent local-mior-modes changes

[Andy Moreton <andrewjmoreton@gmail.com>]

On Fri 12 Mar 2021, Lars Ingebrigtsen wrote:

> Andy Moreton <andrewjmoreton@gmail.com> writes:
>
>>> Presumably the `override-global-mode` was compiled with Emacs-28, so
>>> when you use it with Emacs-27 you get into trouble.
>>
>> Thanks Stefan, that is indeed the problem: the reference was in
>> bind-key.elc. I must have updated the package recently while running
>> emacs built from master.
>>
>> Is there a general way to avoid this kind of problem ?
>> Perhaps I need to use separate elpa dirs for each emacs version.
>
> I think `define-minor-mode' could be more helpful here -- that is, it
> could check run-time whether the variables in question are bound.  This
> should fix this problem when moving between Emacs versions.
>
> I think I'll make that change to Emacs 28 now.

Thanks Lars, this seems to fix things without the need for any
workarounds.

I tested by reinstalling the bind-key package in emacs-28, and checking
that bind-key.elc has a reference to local-minor-modes. After that the
desktop restore works without complaint on emacs-27.

    AndyM