(Ubuntu 14.04) no windows appear when running any Qt5 application.

sobaka_zubrava

I use Ubuntu 14.04 and IceWM (simplest window manager).
I tried to run three different Qt5 applications (see below) - all running, no exit, no crash, but no windows appear. The last example (3) is my code: it prints the message in console, but no windows appear (i expect empty window of size 250x150).

The list of what I tried to run:

The "Qt Online Installer for Linux 64-bit (31 MB)" from https://www.qt.io/download-open-source/#section-2
qtcreator (installed by apt-get install qtcreator).
My own code:

#include <iostream>
#include <QApplication>
#include <ctime> // kill
#include "Controller.h" // kill
#include "WindowMain.h" // kill

int main (int argc, char **argv)
{
    QApplication app(argc, argv);

    QWidget window;

    window.resize(250, 150);
    window.setWindowTitle("Simple example");
    window.show();
    std::cout << "exec...\n";
    return app.exec();
}

I build my application with my custom CMake script: https://github.com/pavelkolodin/audigger/blob/master/CMakeLists.txt

UPDATE:
There is a bug in IceWM:

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=751794

https://sourceforge.net/p/icewm/git/ci/395cfbb56a4adaee7028cfcbe6177ec0b94c181d/

m.sue

You could try your simple example with the following qmake-script and see if you have the same problem:

QT += core gui widgets
TARGET = test
TEMPLATE = app
SOURCES += main.cpp

sobaka_zubrava

@m.sue : I don't use qmake system: i use CMake.