Application doesn't find Qt libraries during compilation process

tankist

I want to build hide console application (not visible components) but system tray icon. My application should use QSerialPort, networking and some else features. So I configure my pro file as follows:

QT -= gui
CONFIG += c++11 console serialport network
CONFIG -= app_bundle

SOURCES += \
        main.cpp

RESOURCES += \
    resources.qrc

The application won't build because tons of errors:

undefined reference to `_imp___ZN11QSerialPortC1EP7QObject'
undefined reference to `_imp___ZN5QMenuC1EP7QWidget'

and so on.
I seems like Qt libraries don't connected to the application.

How to fix that?

jsulm

@tankist Please post the build log, especially the linker calls.

Bonnie

QT += network widgets serialport

Module names should be added/removed in QT, not CONFIG .
And you need to add widgets for QMenu since you removed gui.
[Added]
Ah, seems widgets depends on gui, so adding widgets will add gui again. I guess you should not remove gui if you want use QMenu.

jsulm

@Bonnie Good catch, did not realized OP added modules to CONFIG, not QT

Pl45m4

@tankist said in Application doesn't find Qt libraries during compilation process:

system tray icon

It is not working like that...QSysTrayIcon is a QWidget and therefore needs the QtWidget module. Even though when your intention is to build a "background" app... The above mentioned class(es) (including QMenu what you are probably gonna use as a popup when clicking the icon) requires some GUI components.

tankist

Thank you, guys. It was just my mistake. Now configuration looks like

QT -= gui
QT += serialport network widgets

CONFIG += c++11 console

and the application build process succeeded.
The only issue is widgets are not created. Application crashed on

menu = new QMenu();

with error

QWidget: Cannot create a QWidget without QApplication

I have no idea what was wrong because I created QApplication object before.

int main(int argc, char *argv[])
{
	a = new QCoreApplication(argc, argv);
	sysMon = new SystemMonitor();

Maybe it was wrong idea at all to create console application with system tray icon?

Bonnie

@tankist said in Application doesn't find Qt libraries during compilation process:

Maybe it was wrong idea at all to create console application with system tray icon?

Yes, exactly! As @Pl45m4 already posted above.
And QCoreApplication is not a QApplication, QApplication inherits QGuiApplication, QGuiApplication inherits QCoreApplication.
So clearly you cannot use QMenu without gui.

tankist

Thank you. I'm going to return back into GUI with this project.

Pl45m4

@tankist

You could split your whole app into two components. One non GUI or non Qt background/ console program and one Qt GUI part which is responsible for the system tray menu.