Re: Org mode update breaking build?

[Eli Zaretskii <eliz@gnu.org>]

> From: Madhu <enometh@meer.net>
> Date: Mon, 08 May 2023 17:30:17 +0530
> 
> I haven't update master very recently but a while ago I got into the
> habit of running a script before calling `make'. the $1 parameter is the
> path to src/lisp. it lists stale elc files, which I then delete by hand.
> 
> ```
> for i in $(find "$1" -name \*.elc); do
> 	j=${i%c};
> 	if [ ! -e "$i" ]; then
> 		echo "MISSING $i" >> /dev/stderr
> 	elif [ ! -e "$j" ]; then
> 		echo "MISSING $j" >> /dev/stderr
> 	else
> 		# file-newer-p.sh $j $i  # UNTESTED.
> 		a=$(stat -c '%Y' "$j")
> 		b=$(stat -c '%Y' "$i")
> 		if [ $a -gt $a ]; then echo "$i"; fi;
> 	fi
> done
> ```
> 
> Since I started doing this, I don't think I've faced elisp recompilation
> problems. But I never understood the rationale for "loading stale elc"
> behaviour as a part of recompilation.  If someone can explain that I'd
> appreciate it.

We have switched to "load newer el" behavior quite some time ago, so I
think your script is from before that.

The problem here is not with *.elc files that are older than the
corresponding *.el files, the problem is with _other_ *.elc files that
were produced with outdated definitions of macros, and those macros
are defined in the *.el files other than the one corresponding to the
problematic *.elc.  So just looking at time stamps will not allow to
find the problematic *.elc files.