From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id E7284385782B; Fri, 29 Jan 2021 16:11:17 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org E7284385782B From: "pilarlatiesa at gmail dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/98885] [modules] forward declaration of classes prevent them from being exported at the point of actual declaration Date: Fri, 29 Jan 2021 16:11:17 +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: 11.0 X-Bugzilla-Keywords: accepts-invalid X-Bugzilla-Severity: normal X-Bugzilla-Who: pilarlatiesa at gmail dot com X-Bugzilla-Status: ASSIGNED X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: nathan at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: 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: Fri, 29 Jan 2021 16:11:18 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98885 --- Comment #6 from Pilar Latiesa --- (In reply to Nathan Sidwell from comment #5) > your A-impl.cpp needs `import :B` and vice-versa Yep. Thanks. But that's not enough for it to compile: A-impl.cpp:7:17: error: invalid use of incomplete type =E2=80=98class A@M:B= =E2=80=99 7 | A::f(B const &) const {} | ^~~~~ In module M:B, imported at A-impl.cpp:4: B.cpp:4:14: note: forward declaration of =E2=80=98class A@M:B=E2=80=99 4 | export class A; | ^ A-impl.cpp:2:1: warning: not writing module =E2=80=98M:A=E2=80=99 due to er= rors 2 | module M:A; | ^~~~~~ In module imported at B-impl.cpp:4:1: M:A: error: failed to read compiled module: No such file or directory M:A: note: compiled module file is =E2=80=98gcm.cache/M-A.gcm=E2=80=99 M:A: note: imports must be built before being imported M:A: fatal error: returning to the gate for a mechanical issue compilation terminated.=