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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Cleaning out old X11 toolkits?
Date: Sun, 14 Feb 2021 21:15:09 +0200
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To: Andy Moreton <andrewjmoreton@gmail.com>
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> From: Andy Moreton <andrewjmoreton@gmail.com>
> Date: Sun, 14 Feb 2021 18:18:11 +0000
> 
> > GMP cannot be removed, since we now support bignums, and that's not an
> > optional feature.
> 
> However if libgmp is not found, emacs should be using lib/mini-gmp* as
> the GMP implementation (slower than libgmp but aways available).

So how is that a win? you get the same functionality with worse
performance.  --without-all is supposed to remove functionality.