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 9205F3857816; Fri,  7 May 2021 02:39:32 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 9205F3857816
From: "ramkapte at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/100465] New: Overloading operator+= and including
 filesystem causes conflicting overload compilation error
Date: Fri, 07 May 2021 02:39:32 +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: 11.1.1
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: ramkapte 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
 attachments.created
Message-ID: <bug-100465-4@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: Fri, 07 May 2021 02:39:32 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100465

            Bug ID: 100465
           Summary: Overloading operator+=3D and including filesystem causes
                    conflicting overload compilation error
           Product: gcc
           Version: 11.1.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ramkapte at gmail dot com
  Target Milestone: ---

Created attachment 50771
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D50771&action=3Dedit
Minimal example which cau

Adding an templated function overload for operator+=3D and including <files=
ystem>
causes a compilation error about conflicting overloads. The code works on G=
CC
versions <=3D 9.3 but does not work on GCC versions after that. The code wo=
rks on
MSVC and Clang, so I believe this is a compiler bug. I'm not sure, but I do=
n't
think the internal code of <filesystem> ought to be seeing the overload in =
the
global namespace.

See attached error.cpp for minimal example.

(Godbolt for error.cpp: https://godbolt.org/z/ccPvqf9K9 )=