Kross' metafunction.h has the following code:

    // static metaobject
    staticMetaObject.d.superdata = &QObject::staticMetaObject;
    staticMetaObject.d.stringdata = m_stringData.data();
    staticMetaObject.d.data = m_data;
    staticMetaObject.d.extradata = 0;

Here, d is a struct that is different between Qt 4 and Qt 5. In Qt 4, it was declared as:

    struct { // private data
        const QMetaObject *superdata;
        const char *stringdata;
        const uint *data;
        const void *extradata;
    } d;

And in Qt 5 it is declared as:

    struct { // private data
        const QMetaObject *superdata;
        const QByteArrayData *stringdata;
        const uint *data;
        typedef void (*StaticMetacallFunction)(QObject *, QMetaObject::Call, int, void **);
        StaticMetacallFunction static_metacall;
        const QMetaObject * const *relatedMetaObjects;
        void *extradata; //reserved for future use
    } d;

As one can see, there are more fields there and they are of a different size. For example, assigning a char * to QByteArrayData * is not possible (one probably needs to use QByteArray's data_ptr() member function instead of just data()).

Reproducible: Always

Steps to Reproduce:
1. Build anything that uses metafunction.h.

Actual Results:  
The build fails.

Expected Results:  
The build should succeed.