bug#64735: 29.0.92; find invocations are ~15x slower because of ignores

[Po Lu]

Eli Zaretskii <eliz@gnu.org> writes:

>> Cc: Dmitry Gutov <dmitry@gutov.dev>, 64735@debbugs.gnu.org
>> From: Spencer Baugh <sbaugh@janestreet.com>
>> Date: Thu, 20 Jul 2023 13:08:24 -0400
>> 
>> (Really it's entirely plausible that Emacs could be improved by
>> *removing* directory-files-recursively, in favor of invoking find as a
>> subprocess: faster, parallelized execution, and better remote support.)
>
> No, there's no reason to remove anything that useful from Emacs.  If
> this or that API is not the optimal choice for some job, it is easy
> enough not to use it.

Indeed.

I would like to add that subprocesses remain unimplemented on MS-DOS,
and the way find is currently invoked from project.el and rgrep makes
both packages lose on Unix, indicating that correct portable use of find
is decidedly non-trivial.