bug#48117: 28.0.50; Update of loaddefs.el during normal build is unreliable

[Eli Zaretskii]

> From: Glenn Morris <rgm@gnu.org>
> Cc: 48117@debbugs.gnu.org
> Date: Sun, 02 May 2021 12:59:17 -0400
> 
> Glenn Morris wrote:
> 
> > Another idea, FWIW:
> > In the make rule for $(lisp)/loaddefs.el, if loaddefs.el exists and is
> > older than ldefs-boot.el, start by copying the latter to the former.
> > This ought to limit how outdated loaddefs can get?
> 
> BTW, I think this might actually make things worse in terms of detecting
> new secondary loaddefs files like texinfo-loaddefs (not that those
> happen very often), by bumping the timestamp on the primary loaddefs.

But there's no such thing as detecting new secondary loaddefs, right?
The only remedy for that is "make autoloads-force", right?