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 02FE43858406; Wed, 17 Nov 2021 14:28:41 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 02FE43858406
From: "ppalka at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/103299] [10/11/12 Regression] accessing incorrect storage
 for designated init of anonymous union at constexpr context
Date: Wed, 17 Nov 2021 14:28:41 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 12.0
X-Bugzilla-Keywords: rejects-valid
X-Bugzilla-Severity: normal
X-Bugzilla-Who: ppalka at gcc dot gnu.org
X-Bugzilla-Status: NEW
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: 10.4
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: cf_known_to_fail keywords see_also bug_status
 cf_known_to_work cc short_desc everconfirmed cf_reconfirmed_on
 target_milestone
Message-ID: <bug-103299-4-2nRqRo86BX@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-103299-4@http.gcc.gnu.org/bugzilla/>
References: <bug-103299-4@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: Wed, 17 Nov 2021 14:28:42 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103299

Patrick Palka <ppalka at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to fail|                            |11.2.0, 12.0
           Keywords|                            |rejects-valid
           See Also|                            |https://gcc.gnu.org/bugzill
                   |                            |a/show_bug.cgi?id=3D102538
             Status|UNCONFIRMED                 |NEW
      Known to work|                            |10.1.0, 10.2.0, 10.3.0
                 CC|                            |jason at gcc dot gnu.org,
                   |                            |ppalka at gcc dot gnu.org
            Summary|accessing incorrect storage |[10/11/12 Regression]
                   |for union at constexpr      |accessing incorrect storage
                   |context                     |for designated init of
                   |                            |anonymous union at
                   |                            |constexpr context
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2021-11-17
   Target Milestone|---                         |10.4

--- Comment #1 from Patrick Palka <ppalka at gcc dot gnu.org> ---
Started with r12-954, which has also been backported to the 11/10 branches.

Reduced rejects-valid testcase:

struct foo {
  union {
    int fp1{};
    char fp2;
  };
};

static_assert(foo{.fp2=3D{}}.fp2 =3D=3D 0);=