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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: helsinki.fi X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: VI1PR07MB6254.eurprd07.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: cf08b6e0-9a2b-4e24-05b8-08dbe9d429a7 X-MS-Exchange-CrossTenant-originalarrivaltime: 20 Nov 2023 14:22:44.4125 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 98ae7559-10dc-4288-8e2e-4593e62fe3ee X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: LsVMtoPTgz9ngosXSYtfYX3xLjuj+NXufYDzkWBZDqkJAkuczs0J4sLPUBxEo24BxjQxk1Aa0phw2Sr1CIQIVw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS8PR07MB9329 X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: Hi=0A= =0A= I think I found libstdc++ bug and I tried to report to Bugzilla but "user a= ccount creation has been restricted".=0A= =0A= So I'm going to report it here in hope that someone with a account could re= port it to Bugzilla if they seem it fit.=0A= =0A= Using gcc 13.2 with -std=3Dc++23 code below (https://godbolt.org/z/Kc36rcMY= x) does not compile even if all compile time=0A= allocations are freed before returning from compile time context. MSVC is a= ble to compile it.=0A= =0A= I was suggested elsewhere that it could be some oversight in the SSO implem= entation.=0A= =0A= ```=0A= #include =0A= #include =0A= #include =0A= #include =0A= =0A= using namespace std;=0A= using namespace std::literals;=0A= =0A= constexpr auto foo() {=0A= const auto vec =3D vector{ "a"s, "b"s, "c"s };=0A= return ranges::fold_left(vec, ""s, plus{});=0A= }=0A= =0A= constexpr auto bar() {=0A= return foo().size();=0A= }=0A= =0A= int main() {=0A= constexpr auto _ =3D bar(); // This does not compile=0A= }=0A= ```=0A= =0A= Error message:=0A= =0A= ```=0A= : In function 'int main()':=0A= :19:27: in 'constexpr' expansion of 'bar()'=0A= :15:23: in 'constexpr' expansion of 'foo()()'=0A= :19:28: in 'constexpr' expansion of 'std::ranges::__fold_left_fn:= :operator()(_Range&&, _Tp, _Fp) const [with _Range =3D const std::vector, std::allocator > >&; _Tp =3D std::__cxx11::basic_string; _Fp =3D std::plus](vec, std::literals::string_literals::operator""s(const char*, std::size_= t)(0), (std::plus(), std::plus()))'=0A= :19:28: in 'constexpr' expansion of 'std::__cxx11::basic_string((* & std::move<__cxx11::basic_string&>(__init)))'=0A= :19:28: error: accessing 'std::__cxx11::basic_string::::_M_allocated_capacity' member instead of initialized 'std::__cxx1= 1::basic_string::::_M_local_buf' member in constant ex= pression=0A= 19 | constexpr auto _ =3D bar();=0A= | ^=0A= ```=0A= =0A= Miro Palmu=