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

From: Gregory Heytings <[email-masked]>
Date: Fri, 30 Apr 2021 19:08:48 +0000

>> Can ldefs-boot.el not be used to detect whether loaddefs.el needs to be 
>> regenerated?
>
> I believe that's what Glenn suggested a few minutes ago.
>

Yes, it's more or less the same idea, our mails crossed each other because 
of the lists.gnu.org delivery time.

Note that, as I said, this won't work without keeping ldefs-boot.el up to 
date.