bug#65908: 29.1.50; Emacs 29 regresses on macOS

[Gerd Möllmann]

Alan Third <alan@idiocy.org> writes:

> On Thu, Oct 05, 2023 at 07:11:01PM +0300, Eli Zaretskii wrote:
>> > From: Gerd Möllmann <gerd.moellmann@gmail.com>
>> > Cc: Eli Zaretskii <eliz@gnu.org>,  gregory@heytings.org,
>> >   65908@debbugs.gnu.org,  stefankangas@gmail.com,  ccsmile2008@outlook.com
>> > Date: Thu, 05 Oct 2023 15:18:42 +0200
>> > 
>> > I'd like to propose the attached patch for problem of invalid LANG
>> > setting.  This simply falls back to "en_US.UTF-8" if LANG isn't valid,
>> > or something valid can't be deduced from the locale.
>> 
>> Why is it reasonable to force the UTF-8 codeset as the fallback?
>
> Both the macOS terminals I have access to use UTF-8 as their default,
> and I'm not sure if they even let you change it. Therefore it seemed
> reasonable to me that the default for Emacs should also be UTF-8.

Agree.

>> What about having a variable exposed to Lisp that allows the users to
>> control the fallback value of LANG?
>
> Is this not too early in startup for that? If not then couldn't the
> user just use setenv and avoid this whole thing?

I wonder that, too.