From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id D8DC9384BC17; Tue, 27 Oct 2020 15:22:06 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org D8DC9384BC17 From: "redi at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/97595] New: [11 Regression] warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=] Date: Tue, 27 Oct 2020 15:22:06 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: tree-optimization X-Bugzilla-Version: 11.0 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: redi at gcc dot gnu.org 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 cc 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: Tue, 27 Oct 2020 15:22:07 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97595 Bug ID: 97595 Summary: [11 Regression] warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=3D] Product: gcc Version: 11.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: tree-optimization Assignee: unassigned at gcc dot gnu.org Reporter: redi at gcc dot gnu.org CC: msebor at gcc dot gnu.org Target Milestone: --- This code (reduced from the libstdc++) produces spurious -Wstringop-overflow diagnostics since r11-3827 when compiled with -Wsystem-headers: #include template class std::basic_iostream; In file included from /usr/include/c++/10/bits/nested_exception.h:40, from /usr/include/c++/10/exception:148, from /usr/include/c++/10/ios:39, from /usr/include/c++/10/ostream:38, from /usr/include/c++/10/iostream:39, from inst.cc:1: In member function =E2=80=98void std::basic_ios<_CharT, _Traits>::swap(std::basic_ios<_CharT, _Traits>&) [with _CharT =3D char; _Tr= aits =3D std::char_traits]=E2=80=99, inlined from =E2=80=98void std::basic_istream<_CharT, _Traits>::swap(std::basic_istream<_CharT, _Traits>&) [with _CharT =3D char; _Traits =3D std::char_traits]=E2=80=99 at /usr/include/c++/10/istream= :634:18, inlined from =E2=80=98void std::basic_iostream<_CharT, _Traits>::swap(std::basic_iostream<_CharT, _Traits>&) [with _CharT =3D char; _Traits =3D std::char_traits]=E2=80=99 at /usr/include/c++/10/istream= :882:29, inlined from =E2=80=98std::basic_iostream<_CharT, _Traits>& std::basic_iostream<_CharT, _Traits>::operator=3D(std::basic_iostream<_Char= T, _Traits>&&) [with _CharT =3D char; _Traits =3D std::char_traits]=E2= =80=99 at /usr/include/c++/10/istream:876:6: /usr/include/c++/10/bits/move.h:198:11: warning: writing 1 byte into a regi= on of size 0 [-Wstringop-overflow=3D] In file included from /usr/include/c++/10/iostream:40, from inst.cc:1: /usr/include/c++/10/istream: In member function =E2=80=98std::basic_iostrea= m<_CharT, _Traits>& std::basic_iostream<_CharT, _Traits>::operator=3D(std::basic_iostream<_CharT, _Traits>&&) [with _CharT = =3D char; _Traits =3D std::char_traits]=E2=80=99: /usr/include/c++/10/istream:824:11: note: at offset 224 to object =E2=80=98std::basic_iostream::=E2=80=99 with size 16 decla= red here In file included from /usr/include/c++/10/bits/nested_exception.h:40, from /usr/include/c++/10/exception:148, from /usr/include/c++/10/ios:39, from /usr/include/c++/10/ostream:38, from /usr/include/c++/10/iostream:39, from inst.cc:1: In member function =E2=80=98void std::basic_ios<_CharT, _Traits>::swap(std::basic_ios<_CharT, _Traits>&) [with _CharT =3D char; _Tr= aits =3D std::char_traits]=E2=80=99, inlined from =E2=80=98void std::basic_istream<_CharT, _Traits>::swap(std::basic_istream<_CharT, _Traits>&) [with _CharT =3D char; _Traits =3D std::char_traits]=E2=80=99 at /usr/include/c++/10/istream= :634:18, inlined from =E2=80=98void std::basic_iostream<_CharT, _Traits>::swap(std::basic_iostream<_CharT, _Traits>&) [with _CharT =3D char; _Traits =3D std::char_traits]=E2=80=99 at /usr/include/c++/10/istream= :882:29, inlined from =E2=80=98std::basic_iostream<_CharT, _Traits>& std::basic_iostream<_CharT, _Traits>::operator=3D(std::basic_iostream<_Char= T, _Traits>&&) [with _CharT =3D char; _Traits =3D std::char_traits]=E2= =80=99 at /usr/include/c++/10/istream:876:6: /usr/include/c++/10/bits/move.h:199:11: warning: writing 1 byte into a regi= on of size 0 [-Wstringop-overflow=3D] In file included from /usr/include/c++/10/iostream:40, from inst.cc:1: /usr/include/c++/10/istream: In member function =E2=80=98std::basic_iostrea= m<_CharT, _Traits>& std::basic_iostream<_CharT, _Traits>::operator=3D(std::basic_iostream<_CharT, _Traits>&&) [with _CharT = =3D char; _Traits =3D std::char_traits]=E2=80=99: /usr/include/c++/10/istream:824:11: note: at offset 224 to object =E2=80=98std::basic_iostream::=E2=80=99 with size 16 decla= red here In file included from /usr/include/c++/10/bits/nested_exception.h:40, from /usr/include/c++/10/exception:148, from /usr/include/c++/10/ios:39, from /usr/include/c++/10/ostream:38, from /usr/include/c++/10/iostream:39, from inst.cc:1: In member function =E2=80=98void std::basic_ios<_CharT, _Traits>::swap(std::basic_ios<_CharT, _Traits>&) [with _CharT =3D char; _Tr= aits =3D std::char_traits]=E2=80=99, inlined from =E2=80=98void std::basic_istream<_CharT, _Traits>::swap(std::basic_istream<_CharT, _Traits>&) [with _CharT =3D char; _Traits =3D std::char_traits]=E2=80=99 at /usr/include/c++/10/istream= :634:18, inlined from =E2=80=98void std::basic_iostream<_CharT, _Traits>::swap(std::basic_iostream<_CharT, _Traits>&) [with _CharT =3D char; _Traits =3D std::char_traits]=E2=80=99 at /usr/include/c++/10/istream= :882:29: /usr/include/c++/10/bits/move.h:198:11: warning: writing 1 byte into a regi= on of size 0 [-Wstringop-overflow=3D] In file included from /usr/include/c++/10/iostream:40, from inst.cc:1: /usr/include/c++/10/istream: In member function =E2=80=98void std::basic_iostream<_CharT, _Traits>::swap(std::basic_iostream<_CharT, _Traits>&) [with _CharT =3D char; _Traits =3D std::char_traits]=E2=80= =99: /usr/include/c++/10/istream:824:11: note: at offset 224 to object =E2=80=98std::basic_iostream::=E2=80=99 with size 16 decla= red here In file included from /usr/include/c++/10/bits/nested_exception.h:40, from /usr/include/c++/10/exception:148, from /usr/include/c++/10/ios:39, from /usr/include/c++/10/ostream:38, from /usr/include/c++/10/iostream:39, from inst.cc:1: In member function =E2=80=98void std::basic_ios<_CharT, _Traits>::swap(std::basic_ios<_CharT, _Traits>&) [with _CharT =3D char; _Tr= aits =3D std::char_traits]=E2=80=99, inlined from =E2=80=98void std::basic_istream<_CharT, _Traits>::swap(std::basic_istream<_CharT, _Traits>&) [with _CharT =3D char; _Traits =3D std::char_traits]=E2=80=99 at /usr/include/c++/10/istream= :634:18, inlined from =E2=80=98void std::basic_iostream<_CharT, _Traits>::swap(std::basic_iostream<_CharT, _Traits>&) [with _CharT =3D char; _Traits =3D std::char_traits]=E2=80=99 at /usr/include/c++/10/istream= :882:29: /usr/include/c++/10/bits/move.h:199:11: warning: writing 1 byte into a regi= on of size 0 [-Wstringop-overflow=3D] In file included from /usr/include/c++/10/iostream:40, from inst.cc:1: /usr/include/c++/10/istream: In member function =E2=80=98void std::basic_iostream<_CharT, _Traits>::swap(std::basic_iostream<_CharT, _Traits>&) [with _CharT =3D char; _Traits =3D std::char_traits]=E2=80= =99: /usr/include/c++/10/istream:824:11: note: at offset 224 to object =E2=80=98std::basic_iostream::=E2=80=99 with size 16 decla= red here=