bug#6705: bug#6546: bug#6705: w32 cmdproxy.c pass args to cygwin; erroneous charset conversion (problem description, solution/suggestion)

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Date: Sun, 24 Apr 2022 14:01:32 +0200
> Cc: 6546@debbugs.gnu.org, 6705@debbugs.gnu.org
> 
> Laimonas Vėbra <laimonas.vebra@gmail.com> writes:
> 
> > Create utf-8 file with some unicode characters (Cyrillic, Baltic,
> > whatever; not only ascii) and try to grep for some utf-8 strings from
> > Emacs (M-x grep).
> 
> (I'm going through old bug reports that unfortunately weren't resolved
> at the time.)
> 
> This was eleven years ago -- is this still an issue in recent
> Emacs/Cygwin versions?  (I can't recall seeing any recent reports about
> this.)

I think this bug should be closed.  Support for mixing a native w32
Emacs with Cygwin external programs is limited where character
encoding is involved because of the limitations of the APIs we use in
Emacs to invoke external programs, and because native w32 bui8lds of
external programs in most cases support only a single system codepage.

So people who want to be able to invoke Cygwin programs from Emacs and
play by Cygwin LANG and locale rules (which emulate quite well the
Posix environment) should use a Cygwin build of Emacs.