Details
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Bug
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Resolution: Unresolved
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P1: Critical
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None
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6.4.0 Beta3
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None
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All
Description
For whatever reason, we've a slot definition that receives a Reference to a list type like this:
private slots:
void foo(QStringList& bar) { Q_UNUSED(bar) }
Having this kind of reference in a signal or slot breaks the compilation when QML_ELEMENT is present:
In file included from /home/me/Qt/6.4.0/gcc_64/include/QtCore/qobject.h:18, from /home/me/Qt/6.4.0/gcc_64/include/QtCore/QObject:1, from /home/me/tmp/build-untitled-Desktop_Qt_6_4_0_GCC_64bit-Debug/untitled_autogen/EWIEGA46WW/../../../untitled/droggelbecher.h:3, from /home/me/tmp/build-untitled-Desktop_Qt_6_4_0_GCC_64bit-Debug/untitled_autogen/EWIEGA46WW/moc_droggelbecher.cpp:10, from /home/me/tmp/build-untitled-Desktop_Qt_6_4_0_GCC_64bit-Debug/untitled_autogen/mocs_compilation.cpp:2: /home/me/Qt/6.4.0/gcc_64/include/QtCore/qmetatype.h: In instantiation of ‘static constexpr const char* QtPrivate::QMetaTypeForType<S>::getName() [with S = QList<QString>&]’: /home/me/Qt/6.4.0/gcc_64/include/QtCore/qmetatype.h:2347:48: required from ‘constexpr const QtPrivate::QMetaTypeInterface QtPrivate::QMetaTypeInterfaceWrapper<QList<QString>&>::metaType’ /home/me/Qt/6.4.0/gcc_64/include/QtCore/qmetatype.h:2446:12: required from ‘constexpr const QtPrivate::QMetaTypeInterface* QtPrivate::qMetaTypeInterfaceForType() [with T = QList<QString>&]’ /home/me/Qt/6.4.0/gcc_64/include/QtCore/qmetatype.h:2498:44: required from ‘constexpr const QtPrivate::QMetaTypeInterface* const qt_metaTypeArray [3]<Droggelbecher, void, QList<QString>&>’ /home/me/tmp/build-untitled-Desktop_Qt_6_4_0_GCC_64bit-Debug/untitled_autogen/EWIEGA46WW/moc_droggelbecher.cpp:92:5: required from here /home/me/Qt/6.4.0/gcc_64/include/QtCore/qmetatype.h:2329:45: error: ‘IsBuiltIn’ is not a member of ‘QMetaTypeId2<QList<QString>&>’ 2329 | if constexpr (bool(QMetaTypeId2<S>::IsBuiltIn)) { | ^~~~~~~~~ /home/me/Qt/6.4.0/gcc_64/include/QtCore/qmetatype.h:2330:49: error: ‘nameAsArray’ is not a member of ‘QMetaTypeId2<QList<QString>&>’ 2330 | return QMetaTypeId2<S>::nameAsArray.data(); | ~~~~~~~~~~~~^~~~ /home/me/Qt/6.4.0/gcc_64/include/QtCore/qmetatype.h: In instantiation of ‘constexpr const QtPrivate::QMetaTypeInterface QtPrivate::QMetaTypeInterfaceWrapper<QList<QString>&>::metaType’: /home/me/Qt/6.4.0/gcc_64/include/QtCore/qmetatype.h:2446:12: required from ‘constexpr const QtPrivate::QMetaTypeInterface* QtPrivate::qMetaTypeInterfaceForType() [with T = QList<QString>&]’ /home/me/Qt/6.4.0/gcc_64/include/QtCore/qmetatype.h:2498:44: required from ‘constexpr const QtPrivate::QMetaTypeInterface* const qt_metaTypeArray [3]<Droggelbecher, void, QList<QString>&>’ /home/me/tmp/build-untitled-Desktop_Qt_6_4_0_GCC_64bit-Debug/untitled_autogen/EWIEGA46WW/moc_droggelbecher.cpp:92:5: required from here /home/me/Qt/6.4.0/gcc_64/include/QtCore/qmetatype.h:2347:48: error: ‘static constexpr const char* QtPrivate::QMetaTypeForType<S>::getName() [with S = QList<QString>&]’ called in a constant expression 2347 | /*.name=*/ QMetaTypeForType<T>::getName(), | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~ /home/me/Qt/6.4.0/gcc_64/include/QtCore/qmetatype.h:2327:34: note: ‘static constexpr const char* QtPrivate::QMetaTypeForType<S>::getName() [with S = QList<QString>&]’ is not usable as a ‘constexpr’ function because: 2327 | static constexpr const char *getName() | ^~~~~~~
Whether that makes sense or not - versions < 6.4.0beta2 compile fine here. Removing the reference resolves the problem.