QMainWindow in a lib and dlopen/dlsym: RTTI symbol not found for class 'QWidget'

[NullPointer]

Hello there,

I'm getting an "RTTI symbol not found for class 'QWidget'" (Debug) or a Segmentation fault (direct run) when running an application that makes an dlopen and an dlsym.

In my library I have this:

#  define MHD(retType) extern "C" retType __attribute__((visibility("default")))
MHD(QMainWindow *) newWindow(QWidget * parent){
    return new MainWindow(parent); //MainWindow is a QMainWindow subclass
}

#  define MHD(retType) extern "C" retType __attribute__((visibility("default")))
MHD(QMainWindow *) newWindow(QWidget * parent){
    return new MainWindow(parent); //MainWindow is a QMainWindow subclass
}

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And in my application I have:

typedef QMainWindow* (*newWindow_t)(QWidget*);
    void * dso=dlopen("libMHD.so", RTLD_NOW | RTLD_GLOBAL);
    nw=(newWindow_t)dlsym(dso, "newWindow");
    QMainWindow* mw=nw(this);
    mw->show();

typedef QMainWindow* (*newWindow_t)(QWidget*);
    void * dso=dlopen("libMHD.so", RTLD_NOW | RTLD_GLOBAL);
    nw=(newWindow_t)dlsym(dso, "newWindow");
    QMainWindow* mw=nw(this);
    mw->show();

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With both projects open in QtCreator I am able to debug, and reach the constructor of MainWindow, then stepping into, I fall in a QFlag definition, then SIGSEGV...

I need this to make an application open plugins... The idea is to have a function in each library that returns an std::vector containing all wrappers (I have a base class, and this one have a method const char* getKey(), so I can call a Factory to create new instances of each class using a string.).

This is my first step, and I can't proceed...

So, why, even with QT+= core gui, I'm getting such error?

(Sorry English mistakes...)

Thanks in advance.

[NullPointer]

Aha!

The problem is with the shadow build...
I tried doing a qmake; make from konsole and everything works

(I'm feeling little trolled by QtCreator... :P )