bug#75022: 31.0.50; --init-directory sets user-emacs-directory after user eln-cache is set

[Eli Zaretskii <eliz@gnu.org>]

> From: Andrea Corallo <acorallo@gnu.org>
> Cc: "Jordan Isaacs" <jordan@snowytrees.dev>,  75022@debbugs.gnu.org
> Date: Sun, 29 Dec 2024 06:25:18 -0500
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> >> Date: Sun, 22 Dec 2024 13:26:04 -0800
> >> From: "Jordan Isaacs" <jordan@snowytrees.dev>
> >> Cc: 75022@debbugs.gnu.org
> >> 
> >> Because it is read only, there is no reason not to byte compile everything. I just make it part of the build step when packaging up my configuration.
> >> 
> >> The reasoning for why I byte compile though seems irrelevant, it’s a bug with a simple fix. The eln-cache path isn’t staying in sync with user-emacs-directory. 
> >> 
> >>     (let ((old-face-font-rescale-alist face-font-rescale-alist))
> >>       (unwind-protect
> >> 	  (command-line)
> >> +  (when (featurep 'native-compile)
> >> +     (startup--update-eln-cache))
> >
> > I'm not at all sure it's indeed so simple to change the eln-cache in
> > the middle of a session, but let's hear what Andrea (CC'ed) thinks
> > about this.
> 
> I have nothing in my mind which suggests this should not work, I think
> that if the patch is tested and seems to work we could try it on master.

OK, installed on master, and closing the bug.

Thanks.