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This page describes some workarounds for keeping binary compatibility in patch releases.

You should read the KDE reference: http://techbase.kde.org/Policies/Binary_Compatibility_Issues_With_C++

I need to add a private slot

Use a Q_PRIVATE_SLOT:

    class A: public QObject
    {
        Q_OBJECT
        ...
    private:
        Q_PRIVATE_SLOT(d_func(), void myPrivateSlot())
    };
 
    /* in .cpp file */
 
    void APrivate::myPrivateSlot() {...}
 
    #include "moc_a.cpp"

Pitfalls to avoid:

• Don't include `a.moc`, but `moc_a.cpp` in your .cpp file
• Q_PRIVATE_SLOT takes the complete signature of the private slot, not just its name