bug#70914: 29.3; Crashes often on Windows

[Eli Zaretskii]

> From: Andrea Corallo <acorallo@gnu.org>
> Cc: Simen Endsjø <simendsjo@gmail.com>,
>   70914@debbugs.gnu.org
> Date: Thu, 16 May 2024 08:11:03 -0400
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > Another possible idea is to disable native-compilation and use of
> > *.eln files that were already compiled.  The simplest way of doing the
> > former is to set the variables native-comp-jit-compilation and
> > native-comp-enable-subr-trampolines to nil in your early-init file,
> > then start Emacs as usual.  Can you try that?
> >
> > AFAIK, the above does not prevent Emacs from loading and using the
> > *.eln files that were already generated.  Andrea, what is the best way
> > of disabling the use of existing *.eln files without rebuilding Emacs?
> > Maybe renaming libgccjit-0.dll and restarting Emacs?
> 
> I don't recall any pre-cooked way of doing it.  I suspect renaming
> libgccjit-0.dll on Windows should hinibit the compilation but not the
> load.
> 
> The only option that comes to my mind would be applying the following
> and running make.
> 
> ================
> modified   src/lread.c
> @@ -1430,7 +1430,7 @@ DEFUN ("load", Fload, Sload, 1, 5, 0,
>    else
>      file = Fsubstitute_in_file_name (file);
> 
> -  bool no_native = suffix_p (file, ".elc");
> +  bool no_native = true;/* suffix_p (file, ".elc"); */
> 
>    /* Avoid weird lossage with null string as arg,
>       since it would try to load a directory as a Lisp file.  */
> ================
> 
> But I guess is not an option here if one can't recompile.

Probably not.

For the non-preloaded *.eln files, I guess moving them out of
native-comp-eln-load-path and setting native-comp-jit-compilation and
native-comp-enable-subr-trampolines to nil in early-init should force
Emacs to load the *.elc files, right?  If not, why not?

But if we don't have any way of disabling loading of *.eln, I think we
should provide it.  WDYT?

Also, if we do provide that, what will happen with the preloaded *.eln
files?  They are recorded in the pdumper file, so there's no way of
starting Emacs without loading them? or is there?

Thanks.