How to solve MAKEFILE_GENERATOR variable not set as a result of parsing: ... error ?

[Hasibul Hasan Chowdhury]

@jsulm Yes sir. I include it into header file. But it show a red circle and say QMainWindow not found.

[jsulm]

@Hasibul-Hasan-Chowdhury But are you able to build?

[jsulm]

@Hasibul-Hasan-Chowdhury Also if you changed Qt version you should delete the build directory, run qmake again and then build.

[Hasibul Hasan Chowdhury]

@jsulm No. When I hit the build button, I get this
16:23:10: Running steps for project DatabaseTutorial...
16:23:10: Starting: "G:\IDE\Qt5.8.0\5.8\mingw53_32\bin\qmake.exe" "G:\PROJECTS\Qt Projects\DatabaseTutorial\DatabaseTutorial.pro" -spec win32-g++
MAKEFILE_GENERATOR variable not set as a result of parsing : DatabaseTutorial.pro. Possibly qmake was not able to find files included using "include(..)" - enable qmake debugging to investigate more.
16:23:10: The process "G:\IDE\Qt5.8.0\5.8\mingw53_32\bin\qmake.exe" exited with code 3.
Error while building/deploying project DatabaseTutorial (kit: Desktop Qt 5.8.0 MinGW 32bit)
The kit Desktop Qt 5.8.0 MinGW 32bit has configuration issues which might be the root cause for this problem.
When executing step "qmake"

[jsulm]

@Hasibul-Hasan-Chowdhury This is not the same as "QMainWindow not found". Something is wrong with your .pro file or Kit (you still not checked it as I suggested). Is it possible to upload your project to somewhere and post link here, so I can download it and check?

[Hasibul Hasan Chowdhury]

@jsulm Wait for me sir. I am sending screenshots and details.

[Hasibul Hasan Chowdhury]

@Hasibul-Hasan-Chowdhury I can not upload the screenshots in this forum. I am adding whole code for you.

I have checked kit and I found
Yellow ! Android for armeabi (GCC 4.9, Qt 5.5.1)
Android for armeabi (GCC 4.9, Qt 5.5.1)
Android for armeabi-v7a (GCC 4.9, Qt 5.5.1)
Android for armeabi-v7a (GCC 4.9, Qt 5.5.1)
Android for x86 (GCC 4.9, Qt 5.5.1)
Android for x86 (GCC 4.9, Qt 5.5.1)

Without Yellow ! Android for armeabi-v7a (GCC 4.9, Qt 5.8.0)
Android for x86 (GCC 4.9, Qt 5.8.0)
Desktop Qt %{Qt:Version} MinGW 32bit

kit version Yellow ! Qt %{Qt:Version} MinGW 32bit

[Hasibul Hasan Chowdhury]

@Hasibul-Hasan-Chowdhury
.pro file
#-------------------------------------------------

Project created by QtCreator 2017-03-07T16:05:57

#-------------------------------------------------

QT += core gui

QT += widgets

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = DatabaseTutorial
TEMPLATE = app

The following define makes your compiler emit warnings if you use

any feature of Qt which as been marked as deprecated (the exact warnings

depend on your compiler). Please consult the documentation of the

deprecated API in order to know how to port your code away from it.

DEFINES += QT_DEPRECATED_WARNINGS

You can also make your code fail to compile if you use deprecated APIs.

In order to do so, uncomment the following line.

You can also select to disable deprecated APIs only up to a certain version of Qt.

#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0

SOURCES += main.cpp
mainwindow.cpp

HEADERS += mainwindow.h

FORMS += mainwindow.ui

header file

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
Q_OBJECT

public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();

private:
Ui::MainWindow *ui;
};

#endif // MAINWINDOW_H

source file
#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
}

MainWindow::~MainWindow()
{
delete ui;
}

main file
#include "mainwindow.h"
#include <QApplication>

int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();

return a.exec();

}

xml gui file

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
<class>MainWindow</class>
<widget class="QMainWindow" name="MainWindow">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>400</width>
<height>300</height>
</rect>
</property>
<property name="windowTitle">
<string>MainWindow</string>
</property>
<widget class="QWidget" name="centralWidget"/>
<widget class="QMenuBar" name="menuBar">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>400</width>
<height>21</height>
</rect>
</property>
</widget>
<widget class="QToolBar" name="mainToolBar">
<attribute name="toolBarArea">
<enum>TopToolBarArea</enum>
</attribute>
<attribute name="toolBarBreak">
<bool>false</bool>
</attribute>
</widget>
<widget class="QStatusBar" name="statusBar"/>
</widget>
<layoutdefault spacing="6" margin="11"/>
<resources/>
<connections/>
</ui>

when i run this project I got the previous error.

Thanks.

[jsulm]

@Hasibul-Hasan-Chowdhury Does your .pro file really contain comments without # character at the beginning? It should be like this:

TARGET = DatabaseTutorial
TEMPLATE = app
#The following define makes your compiler emit warnings if you use

Regarding yellow warnings: keep mouse cursor over the Kit - you will see then what the problem is.

[Hasibul Hasan Chowdhury]

@jsulm yes

[jsulm]

@Hasibul-Hasan-Chowdhury Remove all the comments or comment them out

#-------------------------------------------------
Project created by QtCreator 2017-03-07T16:05:57

#-------------------------------------------------

QT += core gui

QT += widgets

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = DatabaseTutorial
TEMPLATE = app

DEFINES += QT_DEPRECATED_WARNINGS

SOURCES += main.cpp \
mainwindow.cpp

HEADERS += mainwindow.h

FORMS += mainwindow.ui

DEFINES += QT_DEPRECATED_WARNINGS can be removed as well.
Add \ after SOURCES += main.cpp
Run qmake again and build.

[Hasibul Hasan Chowdhury]

@Hasibul-Hasan-Chowdhury should I remove this ?

[Hasibul Hasan Chowdhury]

@Hasibul-Hasan-Chowdhury same error

[Hasibul Hasan Chowdhury]

@Hasibul-Hasan-Chowdhury when i run qmake get above error again. where is the problem ?

[jsulm]

@Hasibul-Hasan-Chowdhury Please upload the pro file to somewhere and post a link here. Then I can check.
And please check what is wrong with your "Desktop Qt 5.8.0 MinGW 32bit" Kit.