"warning: returning address of local temporary object" in qt5 #7915

Not sure when this warning appeared, and I don't have time to persue this right now, but this seems like a serious issue upstream:

In file included from qt/walletframe.cpp:5:
In file included from ./qt/walletframe.h:9:
In file included from /usr/include/qt5/QtCore/QMap:1:
/usr/include/qt5/QtCore/qmap.h:620:27: warning: returning address of local temporary object [-Wreturn-stack-address]
    return n ? n->value : adefaultValue;
                          ^~~~~~~~~~~~~
qt/walletframe.cpp:68:45: note: in instantiation of member function 'QMap<QString, WalletView *>::value' requested here
    WalletView *walletView = mapWalletViews.value(name);
                                            ^
/usr/include/qt5/QtCore/qmap.h:389:44: note: binding reference variable 'adefaultValue' here
    const T value(const Key &key, const T &defaultValue = T()) const;
                                           ^              ~~~
1 warning generated.

This is Qt 5.2.1 on Ubuntu 14.04 so this may well be solved in newer versions.

NM, this is a known LLVM false positive: https://llvm.org/bugs/show_bug.cgi?id=26396