qtdeclarative doesn't build with gcc 6 as developer-build

#define Q_VTABLE_FUNCTION(classname, func) \
    (classname::func == QV4::Managed::func ? 0 : classname::func)

class A {
public:
    static void destroyed() { }
};

class B : public A
{
};

const int tbl[1] = {
    B::destroyed == A::destroyed ? 0 : 1
};