Re: Compiling emacs-27.0.91 on macOS Catalina

[Eli Zaretskii <eliz@gnu.org>]

> Date: Fri, 15 May 2020 11:46:00 +0100
> From: Alan Third <alan@idiocy.org>
> Cc: paranda@it.uc3m.es, emacs-devel@gnu.org
> 
> > I don't think I understand the effect of this change yet, so I cannot
> > answer the question.  How will this prevent the problem?
> 
> The color file is simply a native version of etc/rgb.txt. It contains
> colour values and their names.
> 
> I'm not really sure why we save it, to be honest.
> 
> On first run Emacs detects there is no color file (cl == nil in the
> code) and generates it from rgb.txt.
> 
> Since we're unable to detect directly if loading the color file has
> thrown an error my change checks whether there are less colors loaded
> than there are in rgb.txt. If there are less then it will regenerate
> the file.
> 
> It's not great, rgb.txt could change, but I assume at this stage that
> that's unlikely or rare.

Thanks.  If you think this is safe enough to have it in Emacs 27,
please go ahead and push to the release branch.  Otherwise, let's have
a PROBLEMS entry on emacs-27 and this fix on master.