From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 3BF7C3858CD1; Wed, 31 May 2023 10:03:44 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 3BF7C3858CD1 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1685527424; bh=1RRxXhpB6oOKAvlU8Jmt9+fp8+eHkutJG7ji++lYp10=; h=From:To:Subject:Date:From; b=yz38hU3cNyApadYVG0DZzizbH5ze5XyOAYopU/l/k/yWM12QTTcH8XjBrK1c9zA4M ImG/Gc97C69eYEYwMxG89bF/ez//rEwmKTUZ+KCoDonAdMmooOtg0u4ttBZHwzbfBN OZ9yxcevtESj2viczssj75Crbo/GVxluliCDsZfk= From: "spriteovo at gmail dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/110055] New: Dangling pointer warning inside std::vector on RISC-V Date: Wed, 31 May 2023 10:03:43 +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: 13.1.1 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: spriteovo 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 List-Id: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110055 Bug ID: 110055 Summary: Dangling pointer warning inside std::vector on RISC-V Product: gcc Version: 13.1.1 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: spriteovo at gmail dot com Target Milestone: --- This bug can only be reproduce on RISC-V platform. Minimum reproducible example: ```cpp #include #include struct Data { std::vector v =3D {1, 1}; }; int main() { Data a; Data b; } ``` Compile with `g++ main.cpp -Werror -Wall -fno-exceptions -O3` Error message: ``` In file included from /usr/include/c++/13.1.1/vector:62, from main.cpp:2: In static member function =E2=80=98static _Up* std::__copy_move<_IsMove, tr= ue, std::random_access_iterator_tag>::__copy_m(_Tp*, _Tp*, _Up*) [with _Tp =3D = const short unsigned int; _Up =3D short unsigned int; bool _IsMove =3D false]=E2= =80=99, inlined from =E2=80=98_OI std::__copy_move_a2(_II, _II, _OI) [with bool= _IsMove =3D false; _II =3D const short unsigned int*; _OI =3D short unsigned int*]=E2= =80=99 at /usr/include/c++/13.1.1/bits/stl_algobase.h:506:30, inlined from =E2=80=98_OI std::__copy_move_a1(_II, _II, _OI) [with bool= _IsMove =3D false; _II =3D const short unsigned int*; _OI =3D short unsigned int*]=E2= =80=99 at /usr/include/c++/13.1.1/bits/stl_algobase.h:533:42, inlined from =E2=80=98_OI std::__copy_move_a(_II, _II, _OI) [with bool = _IsMove =3D false; _II =3D const short unsigned int*; _OI =3D short unsigned int*]=E2= =80=99 at /usr/include/c++/13.1.1/bits/stl_algobase.h:540:31, inlined from =E2=80=98_OI std::copy(_II, _II, _OI) [with _II =3D const = short unsigned int*; _OI =3D short unsigned int*]=E2=80=99 at /usr/include/c++/13.1.1/bits/stl_algobase.h:633:7, inlined from =E2=80=98static _ForwardIterator std::__uninitialized_copy::__uninit_copy(_InputIterator, _InputIterat= or, _ForwardIterator) [with _InputIterator =3D const short unsigned int*; _ForwardIterator =3D short unsigned int*]=E2=80=99 at /usr/include/c++/13.1.1/bits/stl_uninitialized.h:147:27, inlined from =E2=80=98_ForwardIterator std::uninitialized_copy(_InputIt= erator, _InputIterator, _ForwardIterator) [with _InputIterator =3D const short unsi= gned int*; _ForwardIterator =3D short unsigned int*]=E2=80=99 at /usr/include/c++/13.1.1/bits/stl_uninitialized.h:185:15, inlined from =E2=80=98_ForwardIterator std::__uninitialized_copy_a(_Inp= utIterator, _InputIterator, _ForwardIterator, allocator<_Tp>&) [with _InputIterator =3D= const short unsigned int*; _ForwardIterator =3D short unsigned int*; _Tp =3D short unsigned int]=E2=80=99 at /usr/include/c++/13.1.1/bits/stl_uninitialized.h:= 373:37, inlined from =E2=80=98void std::vector<_Tp, _Alloc>::_M_range_initialize(_ForwardIterator, _ForwardIterator, std::forward_iterator_tag) [with _ForwardIterator =3D const short unsigned = int*; _Tp =3D short unsigned int; _Alloc =3D std::allocator]= =E2=80=99 at /usr/include/c++/13.1.1/bits/stl_vector.h:1692:33, inlined from =E2=80=98std::vector<_Tp, _Alloc>::vector(std::initializer= _list<_Tp>, const allocator_type&) [with _Tp =3D short unsigned int; _Alloc =3D std::allocator]=E2=80=99 at /usr/include/c++/13.1.1/bits/stl_vector.h:679:21, inlined from =E2=80=98constexpr Data::Data()=E2=80=99 at main.cpp:4:8, inlined from =E2=80=98int main()=E2=80=99 at main.cpp:10:8: /usr/include/c++/13.1.1/bits/stl_algobase.h:437:30: error: using a dangling pointer to =E2=80=98C.0=E2=80=99 [-Werror=3Ddangling-pointer=3D] 437 | __builtin_memmove(__result, __first, sizeof(_Tp) * _Num= ); | ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function =E2=80=98int main()=E2=80=99: main.cpp:4:8: note: =E2=80=98C.0=E2=80=99 declared here 4 | struct Data { | ^~~~ cc1plus: all warnings being treated as errors ```=