Custom locales seem not to work

[Brian Inglis]

On 2021-06-21 07:23, Алекса -скрыто- via Cygwin wrote:
> I noticed that Cygwin-linked applications fail to use the proper 
> language code from a Windows custom locale, and revert to C instead. 
> Is that a bug?
Cygwin automatically tries to pick your locale using Windows system 
language, country, and regional settings, if you have set them. Many 
Cygwin packages are not localized, do not come with localizations, may 
not support certain locales, or may have incomplete translations. For 
example, on my system, the following are the only Cygwin programs 
installed with Russian localizations (no others are):

$ ls -xw72 /usr/share/locale/ru*/*
/usr/share/locale/ru/LC_MESSAGES:
alacarte.mo                 alternatives.mo
appstream.mo                appstream-glib.mo
aspell.mo                   atk10.mo
at-spi2-core.mo             bash.mo
bfd.mo                      binutils.mo
bison.mo                    bison-runtime.mo
clisp.mo                    clisplow.mo
coreutils.mo                cpio.mo
cpplib.mo                   cygwin32-cpplib.mo
cygwin32-gcc.mo             dialog.mo
diffutils.mo                dos2unix.mo
epiphany.mo                 exif.mo
findutils.mo                flex.mo
gas.mo                      gcal.mo
gcc.mo                      gcr.mo
gdk-pixbuf.mo               gettext-runtime.mo
gettext-tools.mo            git.mo
glib20.mo                   glib-networking.mo
gnome-doc-utils.mo          gnome-keyring.mo
gnome-menus-3.0.mo          gnupg.mo
gnupg2.mo                   gprof.mo
grep.mo                     gsettings-desktop-schemas.mo
gstreamer-1.0.mo            gtk20.mo
gtk20-properties.mo         gtk30.mo
gtk30-properties.mo         gvfs.mo
help2man.mo                 i686-pc-cygwin-bfd.mo
i686-pc-cygwin-binutils.mo  i686-pc-cygwin-gas.mo
i686-pc-cygwin-gprof.mo     i686-pc-cygwin-ld.mo
iso_15924.mo                iso_3166.mo
iso_3166-1.mo               iso_3166-3.mo
iso_4217.mo                 iso_639.mo
iso_639_3.mo                iso_639-2.mo
iso_639-3.mo                isoquery.mo
json-glib-1.0.mo            ld.mo
lftp.mo                     libexif-12.mo
libfm.mo                    libgpg-error.mo
libgsf.mo                   libiconv.mo
libidn2.mo                  libisocodes.mo
libsecret.mo                libsoup.mo
libwnck.mo                  libwnck-3.0.mo
lxappearance.mo             lxappearance-obconf.mo
lxinput.mo                  lxpanel.mo
lxsession.mo                lxtask.mo
lxterminal.mo               lynx.mo
mailutils.mo                make.mo
man-db.mo                   man-db-gnulib.mo
midori.mo                   openbox.mo
osinfo-db-tools.mo          pcmanfm.mo
popt.mo                     psmisc.mo
rpm.mo                      sed.mo
sharutils.mo                tar.mo
tcsh.cat                    texinfo.mo
util-linux.mo               vte-0.0.mo
WebKitGTK-2.0.mo            WebKitGTK-3.0.mo
wget.mo                     wget2.mo
wget-gnulib.mo              whois.mo
xarchiver.mo                xdg-user-dirs.mo
xdg-user-dirs-gtk.mo        xkeyboard-config.mo

/usr/share/locale/ru/LC_TIME:
coreutils.mo

/usr/share/locale/ru_UA/LC_MESSAGES:
tcsh.cat

Which applications do you have problems with, what locale do you wish to 
use, and what are your locale settings; try running the command below 
and post your input and output (don't worry if some of your output is in 
Русский or Кириллица):

	$ for o in -s -u -i -n -f ''; do locale $o; done
	en_US
	en_GB
	en_CA
	en_CA
	en_CA
	LANG=en_CA.UTF-8
	LC_CTYPE="en_CA.UTF-8"
	LC_NUMERIC="en_CA.UTF-8"
	LC_TIME="en_CA.UTF-8"
	LC_COLLATE="en_CA.UTF-8"
	LC_MONETARY="en_CA.UTF-8"
	LC_MESSAGES="en_CA.UTF-8"
	LC_ALL=

so you can see I run Windows system default US English, user default 
GB/UK English, input, non-Unicode, and regional formats Canadian English 
(and customized some of those settings).

-- 
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

This email may be disturbing to some readers as it contains
too much technical detail. Reader discretion is advised.
[Data in binary units and prefixes, physical quantities in SI.]