From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 791E83858403; Wed, 22 Dec 2021 03:31:00 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 791E83858403 From: "pinskia at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/81973] alias virtual function does not cause the vtable to be emitted even if the aliased function is defined in the TU Date: Wed, 22 Dec 2021 03:31:00 +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: 7.1.0 X-Bugzilla-Keywords: link-failure X-Bugzilla-Severity: normal X-Bugzilla-Who: pinskia 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: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: keywords everconfirmed cf_reconfirmed_on bug_status short_desc 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: Wed, 22 Dec 2021 03:31:00 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D81973 Andrew Pinski changed: What |Removed |Added ---------------------------------------------------------------------------- Keywords| |link-failure Ever confirmed|0 |1 Last reconfirmed| |2021-12-22 Status|UNCONFIRMED |NEW Summary|Aliased virtual methods are |alias virtual function does |treated as undefined, so |not cause the vtable to be |the vtable is not generated |emitted even if the aliased | |function is defined in the | |TU --- Comment #4 from Andrew Pinski --- Confirmed. Note GCC (since 8) does warn about the types being different now: :14:22: warning: 'void s::g()' alias between functions of incompati= ble types 'void (s::)()' and 'void(s*)' [-Wattribute-alias=3D] 14 | void g() __attribute__ ((alias ("s_g_alias"))); | ^ :25:14: note: aliased declaration here 25 | void s_g_alias(s* this_){ | ^~~~~~~~~=