[Bug 269375] querylocale of LC_COLLATE fails after changing from C.UTF-8 to C

From: <bugzilla-noreply_at_freebsd.org>
Date: Mon, 06 Feb 2023 16:38:32 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=269375

            Bug ID: 269375
           Summary: querylocale of LC_COLLATE fails after changing from
                    C.UTF-8 to C
           Product: Base System
           Version: 12.3-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: khw@cpan.org
 Attachment #239952 text/plain
         mime type:

Created attachment 239952
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=239952&action=edit
A short C reproducer program

querylocale() returns C.UTF-8 for LC_COLLATE after the locale has been switched
from C.UTF-8 to C.

This is likely related to #25466

Other operating systems have aliases for a given locale, but they either always
have a base one that the others are synonyms for, and have querylocale always
return that base locale; or they make sure to use the proper alias based on the
name in the original newlocale() call.

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