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 4A19A386D606; Tue, 28 Nov 2023 09:01:14 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 4A19A386D606
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1701162074;
	bh=lvFBeC55eDRteBUEUsMug7uQolj6zJtfLOH292c5d6I=;
	h=From:To:Subject:Date:From;
	b=iZbd5wqu8ESn8u2yN09Soqs+EJgW+Pbx3/9dK1BqFqmZpCHWCNJCHOabrjmwgV6NR
	 j+zFPhL6o2tJix5iBwFp7Rz8oi8X6kvknICCYoTRHgZWNFUvWp5L33cLQT3JmjbbYk
	 IcL5iGav+XctWMHje3yeCu3eLfXV8e/SQvqv/78M=
From: "fchelnokov at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/112744] New: Nested name specifier wrongly produces
 ambiguity in accessing static field
Date: Tue, 28 Nov 2023 09:01:13 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 13.2.1
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: fchelnokov at gmail 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
Message-ID: <bug-112744-4@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
List-Id: <gcc-bugs.sourceware.org>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112744

            Bug ID: 112744
           Summary: Nested name specifier wrongly produces ambiguity in
                    accessing static field
           Product: gcc
           Version: 13.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: fchelnokov at gmail dot com
  Target Milestone: ---

This program

struct A { constexpr static int a =3D 0; };
struct B : A {};
struct C : A {};
struct D : B, C {};

int main() {
    (void)D{}.a;   //ok everywhere
    (void)D{}.A::a; //error in GCC
}

is accepted in Clang and MSVC, but GCC fails on the line with nested name
specifier:

error: 'A' is an ambiguous base of 'D'

Online demo: https://godbolt.org/z/vY6rjd9fx=