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Bug
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Resolution: Unresolved
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P3: Somewhat important
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None
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6.11.0 FF
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None
GCC 15 warns in asan + ubsan build:
[465/661] Building CXX object src/gui/CMakeFiles/Gui.dir/text/qinputcontrol.cpp.o
In file included from /home/marc/Qt/qtbase-submit-build/include/QtCore/qmetatype.h:1,
from /home/marc/Qt/qtbase-submit/src/corelib/kernel/qobject.h:18,
from /home/marc/Qt/qtbase-submit-build/include/QtCore/qobject.h:1,
from /home/marc/Qt/qtbase-submit/src/gui/text/qinputcontrol_p.h:18,
from /home/marc/Qt/qtbase-submit/src/gui/text/qinputcontrol.cpp:4:
In lambda function,
inlined from ‘constexpr _Res std::__invoke_impl(__invoke_other, _Fn&&, _Args&& ...) [with _Res = bool; _Fn = QMetaType::registerConverter<QInputControl::selectionWrapper(QMimeData*)::MimeDataSelection, QMimeData*, QMimeData* (*)(const QInputControl::selectionWrapper(QMimeData*)::MimeDataSelection&)>(QMimeData* (*)(const QInputControl::selectionWrapper(QMimeData*)::MimeDataSelection&))::<lambda(const void*, void*)>&; _Args = {const void*, void*}]’ at /d/gcc/15/include/c++/15.2.1/bits/invoke.h:63:36,
inlined from ‘constexpr std::enable_if_t<((bool)is_invocable_r_v<_Res, _Callable, _Args ...>), _Res> std::__invoke_r(_Callable&&, _Args&& ...) [with _Res = bool; _Callable = QMetaType::registerConverter<QInputControl::selectionWrapper(QMimeData*)::MimeDataSelection, QMimeData*, QMimeData* (*)(const QInputControl::selectionWrapper(QMimeData*)::MimeDataSelection&)>(QMimeData* (*)(const QInputControl::selectionWrapper(QMimeData*)::MimeDataSelection&))::<lambda(const void*, void*)>&; _Args = {const void*, void*}]’ at /d/gcc/15/include/c++/15.2.1/bits/invoke.h:116:35,
inlined from ‘static _Res std::_Function_handler<_Res(_ArgTypes ...), _Functor>::_M_invoke(const std::_Any_data&, _ArgTypes&& ...) [with _Res = bool; _Functor = QMetaType::registerConverter<QInputControl::selectionWrapper(QMimeData*)::MimeDataSelection, QMimeData*, QMimeData* (*)(const QInputControl::selectionWrapper(QMimeData*)::MimeDataSelection&)>(QMimeData* (*)(const QInputControl::selectionWrapper(QMimeData*)::MimeDataSelection&))::<lambda(const void*, void*)>; _ArgTypes = {const void*, void*}]’ at /d/gcc/15/include/c++/15.2.1/bits/std_function.h:292:30:
/home/marc/Qt/qtbase-submit/src/corelib/kernel/qmetatype.h:640:20: warning: ‘D.412881’ is used uninitialized [-Wuninitialized]
640 | auto &&r = function(*f);
| ^
/home/marc/Qt/qtbase-submit/src/corelib/kernel/qmetatype.h:640:20: note: ‘D.412881’ was declared here
640 | auto &&r = function(*f);
| ^
I'm pretty sure it's due to either the double-implicit conversion of the registered type, or the fact that the type is defined locally in the function. Yes, it's probably a False Positive, but this warning may hit users that attempt to use the same techique, so ideally we'll find a solution for it in qmetatype.h and not just change qinputcontrol.cpp.
CC fabiankosmale, vestbo.