Warning C4946: reinterpret_cast used between related classes when using qobject_cast

[doberkofler]

I'm consistently getting "warning C4946: reinterpret_cast used between related classes: 'QObject' and 'QLabel'" when compiling code like the following in VC7:

void myFunction(QWidget* theWidget)
{
   QLabel* aLabel = qobject_cast<QLabel*>(theWidget);
   if (aLabel)
   {
      ...
   }
}

void myFunction(QWidget* theWidget)
{
   QLabel* aLabel = qobject_cast<QLabel*>(theWidget);
   if (aLabel)
   {
      ...
   }
}

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I'm having a hard time to understand why qobject_cast would issues this warning and was hoping for some help to better understand what I'm doing/using wrong?

I (always) compile on the Windows platform with the -Wall and -WX options.