[Bug 208266] strxfrm and strcoll do not always agree

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208266

            Bug ID: 208266
           Summary: strxfrm and strcoll do not always agree
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: standards
          Assignee: freebsd-standards at FreeBSD.org
          Reporter: munro at ip9.org

The man page for strxfrm says:

"Comparing two strings using strcmp() after strxfrm() is equal to compar-
ing two original strings with strcoll()."

The PostgreSQL hackers wrote a test program to study a collation bug
on another operating system.  The test generates random strings and
checks if strxfrm and strcoll agree on their ordering, according to
each locale available on the system.  I decided to try it out on
FreeBSD and found that it passes on 10.2, but fails miserably on
11.0-CURRENT.

The test program is here:

http://www.postgresql.org/message-id/31913.1458747836@sss.pgh.pa.us

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