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buffer.c/buffer.h: How to add new buffer-local variables?

From: Keith David Bershatsky
Subject: buffer.c/buffer.h: How to add new buffer-local variables?
Date: Sat, 30 Mar 2019 16:19:50 -0700

I am working on feature requests #22873 (multiple fake cursors) and #17684 
(crosshairs that track the cursor position).

In an earlier version of the Emacs master branch from a few months ago, I was 
able to increase the number of buffer-local variables in buffer.c/buffer.h by 
changing the value of MAX_PER_BUFFER_VARS from 50 to 60.  That approach does 
not permit me to build a current version of the Emacs master branch, which 
fails with the following error:

    Dumping under the name bootstrap-emacs.pdmp
    dumping fingerprint: 

    pdumper.c:1786: Emacs fatal error: assertion failed: relpos < 1024
    Fatal error 6: Abort trapmake[1]: *** [bootstrap-emacs.pdmp] Abort trap
    make[1]: *** Deleting file `bootstrap-emacs.pdmp'
    make: *** [src] Error 2

    Compilation exited abnormally with code 2 at Sat Mar 30 15:53:18

I have narrowed the issue down to adding just one (1) more buffer local 
variable, which breaks the camel's back.  Attached are git diffs for a working 
build and a broken build.  I am using Emacs master branch from 03/28/2019:  

My config options are as follows:

CFLAGS='-Wall -O0 -g3' ./configure \
--with-ns \
--enable-checking='yes,glyphs' \
--enable-check-lisp-object-type \
--without-compress-install \
--without-makeinfo \
--with-gnutls=no \
--with-mailutils \

How can I increase the number of buffer local variables in buffer.c/buffer.h 
without breaking the ability to build Emacs?


Attachment: patch_working.diff
Description: application/diff

Attachment: patch_broken.diff
Description: application/diff

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