#include <QtGui>

class MainWindow : public QMainWindow {
public:
  MainWindow(QWidget *parent = 0);
  ~MainWindow();
};

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent)
{
  setUnifiedTitleAndToolBarOnMac(true);

  QToolBar *tb = addToolBar("ToolBar");
  QAction *action = new QAction(this);
  action->setText(tr("Some Action"));
  tb->addAction(action);

  QLabel *info = new QLabel;
  info->setText("Press Ctrl+Q and hold it => App will crash if workaround is not enabled");
  setCentralWidget(info);
}

MainWindow::~MainWindow()
{
#ifdef QT_MAC_USE_COCOA
  // Workaround
//  setUnifiedTitleAndToolBarOnMac(false);
//  qApp->processEvents();
#else
#error This is a Qt/Cocoa problem only
#endif
}

int main(int argc, char *argv[])
{
  QApplication a(argc, argv);

  again:

  {
    MainWindow *w = new MainWindow;
    w->show();
    a.exec();

    delete w;
  }

  goto again;
}