Re: master 2c79a8f 2/2: Use posix_spawn if possible.

[Eli Zaretskii]

> Date: Tue, 2 Nov 2021 19:58:10 +0000
> From: Alan Third <alan@idiocy.org>
> Cc: Philipp Stephani <p.stephani2@gmail.com>
> 
> When we put in the fix to use vfork on macOS back in Emacs 26 the
> measured difference between fork and vfork was something like 15x. Now
> Apple have turned vfork into fork I guess we're back to the same
> situation. Packages that make heavy use of external processes, such as
> Magit, are badly hit by this slow down.
> 
> Is there anything we need to do to get scratch/posix-spawn-no-gnulib
> merged into master (or even emacs-28)?

Does it solve the problem?  And which builds does it affect?