From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 6A3A7385800D; Wed, 20 Jan 2021 14:36:52 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 6A3A7385800D From: "pilarlatiesa at gmail dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/98770] New: [modules] including certain stdlib headers in the global module fragment of different modules causes conflicting global module declarations Date: Wed, 20 Jan 2021 14:36:52 +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: 11.0 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: pilarlatiesa 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: 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 List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 20 Jan 2021 14:36:52 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98770 Bug ID: 98770 Summary: [modules] including certain stdlib headers in the global module fragment of different modules causes conflicting global module declarations Product: gcc Version: 11.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: pilarlatiesa at gmail dot com Target Milestone: --- $ /home/pililatiesa/GCC-11/bin/g++ -v Using built-in specs. COLLECT_GCC=3D/home/pililatiesa/GCC-11/bin/g++ Target: x86_64-pc-linux-gnu Configured with: ../gcc-master/configure --prefix=3D($HOME)/GCC-11 --enable-languages=3Dc++ --disable-bootstrap Thread model: posix Supported LTO compression algorithms: zlib gcc version 11.0.0 20210115 (experimental) (GCC) $ cat Tensor.ixx module; #include #include export module VF.Tensor; namespace VF { export template struct TTensor { private: std::istream inline &Read(std::istream &is) { return is; } }; export template using TVector =3D TTensor; } // VF $ cat Mesh.ixx module; #include #include export module VF.Mesh; import VF.Tensor; namespace VF { template class TPoint final : public TVector {}; } $ /home/pililatiesa/GCC-11/bin/g++ -fmodules-ts -x c++ -std=3Dc++20 -I../ -= I./ Tensor.ixx Mesh.ixx -o foo In file included from /home/pililatiesa/GCC-11/include/c++/11.0.0/bits/move.h:57, from /home/pililatiesa/GCC-11/include/c++/11.0.0/bits/nested_exception.h:40, from /home/pililatiesa/GCC-11/include/c++/11.0.0/exception:148, from /home/pililatiesa/GCC-11/include/c++/11.0.0/ios:39, from /home/pililatiesa/GCC-11/include/c++/11.0.0/ostream:3= 8, from /home/pililatiesa/GCC-11/include/c++/11.0.0/iostream:= 39, from Tensor.ixx:5, of module VF.Tensor, imported at Mesh.ixx:9: /home/pililatiesa/GCC-11/include/c++/11.0.0/type_traits:634:31: error: conflicting global module declaration =E2=80=98template using __= void_t =3D void=E2=80=99 634 | template using __void_t =3D void; | ^~~~~~~~ In file included from Mesh.ixx:5: /home/pililatiesa/GCC-11/include/c++/11.0.0/type_traits:634:31: note: exist= ing declaration =E2=80=98template using __void_t =3D void=E2=80=99 634 | template using __void_t =3D void; | ^~~~~~~~ Mesh.ixx:14:29: note: during load of binding =E2=80=98VF::TVector@VF.Tensor= =E2=80=99 14 | class TPoint final : public TVector {}; | ^~~~~~~ Mesh.ixx:7:8: warning: not writing module =E2=80=98VF.Mesh=E2=80=99 due to = errors 7 | export module VF.Mesh; |=