Re: Emacs port to gcc -fcheck-pointer-bounds

[Eli Zaretskii <eliz@gnu.org>]

> From: Paul Eggert <eggert@cs.ucla.edu>
> Date: Wed, 6 Dec 2017 23:34:54 -0800
> Cc: Pip Cet <pipcet@gmail.com>
> 
> In <https://debbugs.gnu.org/29600> I published patches to port Emacs to the 
> -fcheck-pointer-bounds option of GCC, so that I can debug Emacs with hardware 
> pointer bounds checking on platforms that support it (such as the Kaby Lake chip 
> in my year-old laptop running Ubuntu 17.10). This entails changing the 
> fundamental Emacs internal word from an integer to a pointer of the same width - 
> which is not as big a deal as one might think, as the commonly-used EMACS_INT 
> type does not change and Emacs users and Emacs Lisp programmers should not 
> notice any change.

Thanks.

It's a large patch, so I think the discussion could benefit from an
overview of the main points of the implementation.

In particular, how would this work in a build --with-wide-int?