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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: buffer.c/buffer.h: How to add new buffer-local variables?
Date: Mon, 08 Apr 2019 20:43:20 +0300
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> From: Andreas Schwab <schwab@linux-m68k.org>
> Cc: emacs-devel@gnu.org, Keith David Bershatsky <esq@lawlist.com>, Paul Eggert <eggert@cs.ucla.edu>, monnier@iro.umontreal.ca, acm@muc.de, dancol@dancol.org
> Date: Mon, 08 Apr 2019 19:31:46 +0200
> 
> On Apr 08 2019, Eli Zaretskii <eliz@gnu.org> wrote:
> 
> > I guess we need to make BUFFER_LISP_SIZE smarter?
> 
> Perhaps adding a dummy member the same size as Lisp_Object, and using
> that as the anchor?

Could be, although this will make the struct larger than it could have
been on some systems.

These complications are why I wonder whether they are worth the
occasional hard-to-debug bug.  How hard would it be to ask to update
the value when a Lisp member is added?