https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105631
Bug ID: 105631 Summary: GCC internal compiler error: Segmentation fault when trying to compile Qt 6.3 Product: gcc Version: 12.1.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: ioan.mitiu at zimperium dot com Target Milestone: --- Got following error when tried to compile sources after a migration from Qt 5.12.12 -> Qt 6.3: ================================================================== /opt/qt/qt-6.3.0/include/QtCore/qfuture_impl.h:137:34: internal compiler error: Segmentation fault 137 | std::is_class_v<class T::QPrivateSignal> | ^~~~~~~~~~~~~~ 0xe4c988 internal_error(char const*, ...) ???:0 0x9ecbcd class_decl_loc_t::add(cp_parser*, unsigned int, tag_types, tree_node*, bool, bool) ???:0 0x14e7873 c_parse_file() ???:0 0x14c9d9e c_common_parse_file() ???:0 ================================================================= In order to reproduce it is needed only to have following includes: #include <QtWidgets> #include <QtConcurrent> together with a member variable like: QFutureWatcher<std::optional<StringVector>> targetsResultWatcher;