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int var = 1;

static int var = 1;

дин. дллку

// static lib
...

// dll
...

// exe
...

// static dll
///////////////////////////////////////////////////
//static.h
///////////////////////////////////////////////////
#ifndef STATIC_H
#define STATIC_H

#include <QObject>


class Q_DECL_EXPORT MyClass 
{
public:
	MyClass();
	~MyClass();

public:
	static MyClass* self;

};

class dyn_interface
{
public:
	virtual MyClass** pself() = 0;
};

#endif // STATIC_H

///////////////////////////////////////////////////
static.cpp
///////////////////////////////////////////////////

#include "static.h"

MyClass* MyClass::self = (MyClass*) 0xabcdef;
MyClass::MyClass()
{
	self = this;
}

MyClass::~MyClass()
{
	self = 0;
}
 

// dynamic dll

///////////////////////////////////////////////////
dynamic.h
///////////////////////////////////////////////////
#ifndef DYNAMIC_H
#define DYNAMIC_H

#include <QObject>
#include "static.h"


class dynamic : public dyn_interface
{
public:
	dynamic();
	~dynamic();

public:
	MyClass** pself();

};

#endif // DYNAMIC_H


///////////////////////////////////////////////////
dynamic.cpp
///////////////////////////////////////////////////
#include "dynamic.h"

dynamic::dynamic()
{

}

dynamic::~dynamic()
{ 

}

MyClass** dynamic::pself()
{
	return &MyClass::self;
}



extern "C" Q_DECL_EXPORT dynamic* createObject()
{
	return new dynamic;
}

///////////////////////////////////////////////////
main.cpp
///////////////////////////////////////////////////
#include <QtGui>
#include <static.h>


int main(int argc, char *argv[])
{
	QApplication a(argc, argv);
	
	MyClass* stat_obj = new MyClass;
	
	QTextBrowser browser;

	typedef dyn_interface* (*proto)();
	QLibrary lib("dynamic");

	proto func = (proto) lib.resolve("createObject");
	
	dyn_interface* obj = func();

	MyClass** pSelf = obj->pself();

	QString text;
	text = QString(
		"in exe:<br>&MyClass::self=%1<br>MyClass::self=%2<br><br>"
		"in dll pself:<br>&MyClass::self=%3<br>MyClass::self=%4<br><br>")
		.arg((quint32)&MyClass::self,8,16)
		.arg((quint32)MyClass::self,8,16)
		.arg((quint32)pSelf,8,16)
		.arg((quint32)*pSelf,8,16);

	browser.insertHtml(text);
	browser.show();

	return a.exec();
}