bug#51832: Piping unicode text in `shell-command'

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: tor.a.s.kringeland@ntnu.no,  51832@debbugs.gnu.org,  alan@idiocy.org
> Date: Sun, 14 Nov 2021 10:46:05 +0100
> 
>   NSLocale *locale = [NSLocale currentLocale];
> 
>   NSTRACE ("ns_init_locale");
> 
>   @try
>     {
>       /* It seems macOS should probably use UTF-8 everywhere.
>          'localeIdentifier' does not specify the encoding, and I can't
>          find any way to get the OS to tell us which encoding to use,
>          so hard-code '.UTF-8'.  */
>       NSString *localeID = [NSString stringWithFormat:@"%@.UTF-8",
>                                      [locale localeIdentifier]];
> 
>       /* Set LANG to locale, but not if LANG is already set.  */
>       setenv("LANG", [localeID UTF8String], 0);
>     }
> 
> And...  it's a Macos bug?  Googling a bit seems to say that this does
> indeed return invalid locale identifiers -- just language glued together
> with the country, resulting in identifiers that doesn't match any
> locales the OS knows about.
> 
> So...  I don't know what to do about that.  Is there a way to check that
> the identifier is valid?

I asked once why we push LANG into the environment, instead of calling
setlocale, which would only affect Emacs.  I don't think I saw an
answer to that question, or did I miss it?