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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: Sun, 07 Apr 2019 18:48:21 +0300
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To: Keith David Bershatsky <esq@lawlist.com>
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In-reply-to: <m2v9zqy1eh.wl%esq@lawlist.com> (message from Keith David
	Bershatsky on Sat, 06 Apr 2019 19:50:14 -0700)
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> Date:  Sat, 06 Apr 2019 19:50:14 -0700
> From:  Keith David Bershatsky <esq@lawlist.com>
> Cc:  emacs-devel@gnu.org,Stefan Monnier <monnier@iro.umontreal.ca>,Andreas Schwab <schwab@linux-m68k.org>,Alan Mackenzie <acm@muc.de>,Daniel Colascione <dancol@dancol.org>,Paul Eggert <eggert@cs.ucla.edu>
> 
> Using an unsophisticated method of going back in time and building various versions of Emacs on the w32 platform, I tracked down the inability to add a few new buffer-local variables in buffer.c/buffer.h to a commit that occurred on 01/31/2019:  05d2fc7170fb66a87601b1c76ddae2c1b7b4b934.

Is your GDB version 8.1 or later?  If so, please do this:

  $ cd /path/to/emacs/src
  $ gdb ./emacs.exe
  ...
  (gdb) start -Q
  ...
  (gdb) ptype /o current_buffer

and post here the result.  Please do this both in the build before and
after the above commit, and let us see both results.