Re: L10N & LC variables

[Paul Eggert <eggert@cs.ucla.edu>]

On 05/26/2017 07:41 AM, Jean-Christophe Helary wrote:
> 2005-04-14  YAMAMOTO Mitsuharu<mituharu@math.s.chiba-u.ac.jp>
>
> 	* international/mule-cmds.el (set-locale-environment): On Mac OS,
> 	use preferences AppleLocale and AppleLanguages, and variable
> 	mac-system-locale for default locale.  On Mac OS Classic, use
> 	mac-system-coding-system for default coding systems.
> But there is no further references to mac-system-locale in the other changelogs

That code was removed here:

http://git.savannah.gnu.org/cgit/emacs.git/commit/?id=9e2a2647758db83b490e2993aa31cd4607305a82

in a commit dated 2008-07-27 that removed support for Carbon. From what 
you say, that part of the 2008 change is making life for macOS users 
more difficult, in that they sometimes need to manually set their 
language environment instead of having it be deduced automatically from 
system settings. Presumably there is a non-Carbon way to do the 
equivalent of the old code, and if you or some other macOS expert would 
write it, that would remove this minor glitch in the default Emacs 
configuration on macOS.

Here's a tip to help you research similar issues in the future: to find 
when the string "AppleLocale" was removed from the file 
lisp/international/mule-cmds.el, you can use this shell command:

git log -S AppleLocale lisp/international/mule-cmds.el