Program runs even if there is no code

[Emit]

I have an Aplication(Qt Widgets Aplication). Inside I have 2 .cpp files (main,mainwindow). If i comment out all the includes in mainwindow the program still runs like nothing has happened. I think the program should instead throw an error.
Am I right and the program should not run?

[ChrisW67]

Do a clean build and see what happens.

[Emit]

1) cleaned the program
2) Rebuild it
3) than ran it

This is the destructor :

MainWindow::~MainWindow()
{
    delete ui;
    db.close();
    qDebug() << "from destructor1";
//    delete model1;
//    delete model2;
//    qDebug() << "from destructor2";
//    qDebug() << ui->textBrowser_MySQL_log->toPlainText();
 
}

MainWindow::~MainWindow()
{
    delete ui;
    db.close();
    qDebug() << "from destructor1";
//    delete model1;
//    delete model2;
//    qDebug() << "from destructor2";
//    qDebug() << ui->textBrowser_MySQL_log->toPlainText();

}

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this is the output:

from destructor1
from destructor2

from destructor1
from destructor2

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[faldzip]

So it seems that it is not rebuilt. How did you run it?

[Emit]

ctrl + r, green buton run

[wysota]

ctrl + r, green buton run

Try manually deleting the whole build directory of your project and see if the problem persists.

[Emit]

It looks like now runs as it should.

[Emit]

Is there a bug in Qt creator or did I do something to make it not work?

[ChrisW67]

This is not a bug in Qt Creator. The actual compilation has nothing to do with Qt Creator; it merely hands it off to make after running qmake. If you mangle the file timestamps on your source/target files or tell make to build using the wrong files then you get unexpected results. This is quite obvious from the output of the build, which will show little or no actual compilation/linking activity because the target is "up to date". You should read and familiarise yourself with a normal build output.