Yes, I am getting "undefined reference to `vtable for Window'"

vincegata

Hello,

So, I am getting the error when I do the build:
$ clang++ -g -std=c++14 subc*.cpp -I/usr/include/qt4 -I/usr/include/qt4/QtGui -I/usr/include/qt4/QtCore -lQtCore -lQtGui

$ tmp/subcl-f65a46.o: In function Window': undefined reference to vtable for Window'
clang: error: linker command failed with exit code 1 (use -v to see invocation)

I am on Linux, I am not using Qt Creator, I am not using qmake. That is because this GUI qt project will be added to a (very) large project with its own build system based on make files.

This is the example straight out of the Qt For Beginners page.

// subcl.h
#ifndef SUBCL_H
#define SUBCL_H
#include <QWidget>
class Window : public QWidget
{
 Q_OBJECT
 public:
  explicit Window(QWidget *parent = 0);
  virtual ~Window();
 signals:
 public slots:
};
#endif 

// subcl.cpp
#include "subcl.h"
Window::Window(QWidget *parent) : QWidget(parent) {}
Window::~Window(void) {}

// subclmain.cpp
#include <QApplication>
#include "subcl.h"
int main(int argc, char **argv)
{
 QApplication app (argc, argv);
 Window window;
 window.show();
 return app.exec();
}

I've done the googling.

Can someone help me with this -- thank you!

vincegata

Note, I added the virtual desctructor (did not help.)

ChrisW67

After adding the Q_OBJECT macro you must run the header through moc, compile the generated source, and include it in the link stage.

Normally qmake would do that for you.