bug#58224: 29.0.50; "make bootstrap" spuriously warns: "comp.el newer than byte-compiled file"

[Eli Zaretskii <eliz@gnu.org>]

> Date: Sun, 2 Oct 2022 10:43:44 +0000
> Cc: stefankangas@gmail.com, 58224@debbugs.gnu.org, acm@muc.de
> From: Alan Mackenzie <acm@muc.de>
> 
> > Instead of inventing a new value that overrides the non-nil value, why
> > not simply reset the variable to nil?
> 
> force-load-messages is nil by default, and currently isn't used at all
> by Emacs.  It seems to be a pure debugging variable.
> 
> The NOMESSAGE argument to Fload when non-nil, causes the unwanted
> message:
> 
>     Source file `foo.el' newer than byte-compiled file; using older file
> 
> ..  When NOMESSAGE is nil, we get instead
> 
>     Loading foo.elc (compiled; note, source file is newer)...
> 
> ..  Whichever setting of NOMESSAGE and force-load-messages we use, we get
> one of the above messages displayed.  So, I'm proposing using a new
> value 'never for force-load-messages to mean display neither of these
> messages.

I don't want to complicate the public Lisp API because we have a
singular situation at some point of the bootstrap, and for minor
aesthetic reasons at that; that is the tail wagging the dog.  So let's
fix this more subtly.

How about recognizing (inside Fload) a specific time stamp of the
older file we use (we set it to the beginning of the Epoch, right?),
and suppressing the message in that case?