From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id A5C35385840D; Wed, 9 Mar 2022 17:12:59 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org A5C35385840D From: "redi at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/96780] debuginfo for std::move and std::forward isn't useful Date: Wed, 09 Mar 2022 17:12:59 +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: X-Bugzilla-Severity: normal X-Bugzilla-Who: redi at gcc dot gnu.org X-Bugzilla-Status: ASSIGNED X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: ppalka 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: Wed, 09 Mar 2022 17:12:59 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96780 --- Comment #13 from Jonathan Wakely --- (In reply to Jason Merrill from comment #11) > I'm surprised that adding the "artificial" attribute didn't work; I thoug= ht > the main point of that attribute was to automatically skip the function in > the debugger/profiler. I guess that never got implemented in gdb? It seems to work with optimization, but not at -O0: $ gdb -q -ex start -ex step -ex step -ex cont -ex q a.out Reading symbols from a.out... Temporary breakpoint 1 at 0x40110e: file move.C, line 16. Starting program: /tmp/a.out=20 Temporary breakpoint 1, main () at move.C:16 16 int i =3D 0; 17 return std::move(i); std::move (__t=3D@0x7fffffffd77c: 0) at move.C:11 11 { return static_cast::type&&>(__t); } Continuing. [Inferior 1 (process 1629725) exited normally] I think I must have only tested -O0 last time. > But these functions aren't really artificial, just tiny, so using that > attribute seems wrong. I think there's a case to be made for things like std::__addressof and std::__is_constant_evaluated being "artificial" because they are just wrapp= ers around a built-in, and purely impl details. But I agree that std::move and std::forward are not "artificial" in the sense of the DW_AT_artificial tag: https://dwarfstd.org/doc/DWARF5.pdf#page=3D65=