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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: About ./configure --cache-file (WAS: CHECK_STRUCTS/dmpstruct.h
	mechanism is broken.)
Date: Sun, 14 Apr 2019 17:53:45 +0300
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> From: Noam Postavsky <npostavs@gmail.com>
> Date: Sun, 14 Apr 2019 10:44:03 -0400
> Cc: Alan Mackenzie <acm@muc.de>, Paul Eggert <eggert@cs.ucla.edu>, 
> 	Emacs developers <emacs-devel@gnu.org>
> 
> Why wouldn't you expect that to work?

I assumed (without checking) that --with-gpm=no caches some variable.

> > I think you are just being lucky: configure always recomputes
> > variables that are not cached yet.
> 
> If you pass --with-gpm=no, it skips the test so there's nothing to
> cache anyway.

A.k.a. "lucky".