GNU bug report logs - #9106
24.0.50; ./configure causes massive recompilation

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: 9106 <at> debbugs.gnu.org
Subject: bug#9106: 24.0.50; ./configure causes massive recompilation
Date: Mon, 25 Apr 2022 14:34:12 +0300

> From: Lars Ingebrigtsen <larsi <at> gnus.org>
> Cc: 9106 <at> debbugs.gnu.org
> Date: Mon, 25 Apr 2022 12:40:20 +0200
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> > Invocation of the `configure' script causes recompilation of many
> > source files, even though nothing has really changed.
> >
> > It looks like the cause is lib/Makefile which states that several
> > generated headers in that directory depend on config.status.  So each
> > `configure' causes those headers to be regenerated, which in turn
> > triggers many files using those headers to be recompiled.
> >
> > This is annoying, as building Emacs even on a modern system takes a
> > significant amount of time (about 3 minutes on this box, whose details
> > see below).  Can this annoyance be removed, please?
> 
> Reading this bug thread, it seems that various options were suggested
> (mostly around different move-if-changed solutions), but they all seemed
> to have various problems.
> 
> I think that it's unlikely that a user runs configure twice in a row
> without changing any options, so I don't personally see any problems
> with re-compiling all the .c files after running configure, so I wonder
> whether there's really anything to be done here.

I don't mind closing this as wontfix.

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