Linking error for basic Qt5 application using CMake - cmake

Question

I am trying to build a simple Qt5 application using CMake
The Qt5 project is the basic project generated when creating a new project with a Widget.
The project builds and runs successfully with QtCreator
widget.h
#ifndef WIDGET_H
#define WIDGET_H
#include <QWidget>
namespace Ui {
class Widget;
}
class Widget : public QWidget
{
Q_OBJECT
public:
explicit Widget(QWidget *parent = 0);
~Widget();
private:
Ui::Widget *ui;
};
#endif // WIDGET_H
widget.cpp
#include "widget.h"
#include "ui_widget.h"
Widget::Widget(QWidget *parent) :
QWidget(parent),
ui(new Ui::Widget)
{
ui->setupUi(this);
}
Widget::~Widget()
{
delete ui;
}
main.cpp
#include "widget.h"
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
Widget w;
w.show();
return a.exec();
}
The CMakeLists file have been written according to the example given in the Qt5 documentation. The path to the Qt5 directory is given in the cache.
http://doc.qt.io/qt-5/cmake-manual.html
CMakeLists.txt
cmake_minimum_required(VERSION 2.8.11)
project(test0)
# Find includes in corresponding build directories
set(CMAKE_INCLUDE_CURRENT_DIR ON)
# Instruct CMake to run moc automatically when needed.
set(CMAKE_AUTOMOC ON)
# Find the QtWidgets library
find_package(Qt5Widgets)
# Tell CMake to create the executable
add_executable(test0 WIN32 main.cpp)
# Use the Widgets module from Qt 5.
target_link_libraries(test0 Qt5::Widgets)
The Cmake generation works fine.
I'm getting linking errors (undefined reference to methods belonging to the Widget class) when building the app using the Makfile generated by Cmake.
(here is a capture of the errors)
http://s31.postimg.org/edefl1m6j/Capturetest0.png
Any tips ?
System :
Windows 7
Compiler :
MinGW32
Versions :
QT 5.6.1 (mingw49_32)
CMake 3.6.0

Answer 1

Two mistakes in the CMakeLists
- widget.cpp has to be mentionend in add_executable as explained Tsyvarev
- use autouic in order to create the ui_widget.h associated with the widget.ui and widget.cpp
The working CMakeLists is the following :
cmake_minimum_required(VERSION 2.8.11)
project(test0)
# Find includes in corresponding build directories
set(CMAKE_INCLUDE_CURRENT_DIR ON)
# Instruct CMake to run moc automatically when needed.
set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTOUIC ON)
# Find the QtWidgets library
find_package(Qt5Widgets)
# Tell CMake to create the executable
add_executable(test0 WIN32 main.cpp widget.cpp widget.ui)
# Use the Widgets module from Qt 5.
target_link_libraries(test0 Qt5::Widgets)