qobject_cast fails across dynamic library boundaries

[JPNaude]

Hi

I'm sitting with a problem where a qobject_cast fails when doing a cast across a DLL boundary.

I have a base class:

class Variable : public QObject
{
    Q_OBJECT
 
public:
    Variable(QObject* parent = 0);
    ~Variable();
}

class Variable : public QObject
{
    Q_OBJECT

public:
    Variable(QObject* parent = 0);
    ~Variable();
}

To copy to clipboard, switch view to plain text mode 

and a class which inherits Variable:

class MatrixReal : public Variable
{
    Q_OBJECT
 
public:
    MatrixReal();
}

class MatrixReal : public Variable
{
    Q_OBJECT

public:
    MatrixReal();
}

To copy to clipboard, switch view to plain text mode 

I create a MatrixReal* instance and cast it to a Variable*. When casting Variable* to MatrixReal* again later on in the same DLL it works. However if I send this Variable* to a different DLL and try to cast to MatrixReal* there it fails.

Any ideas on how to get this working would be much appreciated.

Thanks,
Jaco