From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugzilla@gcc.gnu.org>
Received: by sourceware.org (Postfix, from userid 48)
 id CA37A388A034; Thu, 11 Mar 2021 16:46:08 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org CA37A388A034
From: "lewis at sophists dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/99556] New: time_get<wchar_t>::date_order()  returns
 no_order on en_US - it should return mdy
Date: Thu, 11 Mar 2021 16:46:08 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: libstdc++
X-Bugzilla-Version: 10.2.0
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: lewis at sophists dot com
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: bug_id short_desc product version bug_status
 bug_severity priority component assigned_to reporter target_milestone
 attachments.created
Message-ID: <bug-99556-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-BeenThere: gcc-bugs@gcc.gnu.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Gcc-bugs mailing list <gcc-bugs.gcc.gnu.org>
List-Unsubscribe: <https://gcc.gnu.org/mailman/options/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=unsubscribe>
List-Archive: <https://gcc.gnu.org/pipermail/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-request@gcc.gnu.org?subject=help>
List-Subscribe: <https://gcc.gnu.org/mailman/listinfo/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=subscribe>
X-List-Received-Date: Thu, 11 Mar 2021 16:46:08 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99556

            Bug ID: 99556
           Summary: time_get<wchar_t>::date_order()  returns no_order on
                    en_US - it should return mdy
           Product: gcc
           Version: 10.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: lewis at sophists dot com
  Target Milestone: ---

Created attachment 50367
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D50367&action=3Dedit
locale_time_get_date_order_no_order_Buggy.cpp

According to=20
    https://en.cppreference.com/w/cpp/locale/time_get/date_order

the 'date_order' field for the locale en_US should be MDY;
libstdc++ appears to understand this emprirically from how it parses dates.

However, the value returned by time_get<wchar_t>::date_order() is 'no_order'
instead of 'mdy'.

This behavior APPEARS faulty given the above documentation.

I would not this behavior is also DIFFERENT than libc++ (clangs library) and
differnt from visual studios implmenetation which all return the (apparentl=
y)
correct mdy value.

Compile with
g++ locale_time_get_date_order_no_order_Buggy.cpp

will happen with any compiler version, but I tested on the latest ubuntu wi=
th
g++ (Ubuntu 10.2.0-13ubuntu1) 10.2.0

Reproducing file is attached.

note - https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D9635 appears to be a
similar report, but is almost 20 years old.=