The following example code:


#include <QSharedPointer>

QPair<int, QSharedPointer<int>> foo() {
	return {42, nullptr};
}

int main() {
	auto [x, p] = foo();
	auto p2 = p;
}


produces the following warning:


QtCore.framework/Headers/qsharedpointer_impl.h:460:7: warning: 1st function call argument is an uninitialized value [clang-analyzer-core.CallAndMessage]
    { deref(d); }
      ^
test.cpp:9:12: note: Uninitialized value stored to '.second.d'
        auto p2 = p;
                  ^
test.cpp:10:1: note: Calling implicit destructor for 'QPair<int, QSharedPointer<int>>'
}
^
test.cpp:10:1: note: Calling '~QSharedPointer'
QtCore.framework/Headers/qsharedpointer_impl.h:315:25: note: Calling 'QSharedPointer::deref'
    ~QSharedPointer() { deref(); }
                        ^
QtCore.framework/Headers/qsharedpointer_impl.h:460:7: note: 1st function call argument is an uninitialized value
    { deref(d); }
      ^


Which is weird, since QSharedPointer's copy constructor initializes d. Is this a false-positive?

See related Qt bug report: https://bugreports.qt.io/browse/QTBUG-77641