bug#50934: 28.0.60; paren.el should be preloaded

[Eli Zaretskii]

> From: Andrea Corallo <akrl@sdf.org>
> Cc: 50934@debbugs.gnu.org
> Date: Fri, 01 Oct 2021 13:11:33 +0000
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> >> Date: Fri, 01 Oct 2021 13:49:31 +0300
> >> From: Eli Zaretskii <eliz@gnu.org>
> >> 
> >> Since show-paren-mode is now ON by default, whenever Emacs starts it
> >> now loads paren.elc? during startup.  So I think we should now preload
> >> paren.el.
> >
> > One consequence of paren.el's not being preloaded is that in a
> > native-compilation build, Emacs begins compiling paren.el as soon as
> > it starts, and that causes it also to compile about a dozen other
> > files that comp.el requires.  Should we perhaps native-compile all the
> > prerequisites of comp.el as part of COMPILE_FIRST when we build Emacs?
> 
> I think we should keep an eye on the build time impact of this.  If I'm
> not mistaken native compiling COMPILE_FIRST targets is slower than
> afterward cause comp.el and friends are running interpreted.

The native-compilation build is already painfully slow, and most of it
isn't spent in COMPILE_FIRST.  We could, of course, add those files to
shortlisp instead, if you think this is better.