Where is located the qDebug qWarning qCritical and qFatal log by default on Qt?

Question

When running my Qt5 application on linux, I don\'t see any output from qDebug, qWarning, qCritical or qFatal. I know that I can use qInstallMsgHandler to instal

Answer 1

If you happen to run Arch Linux, which compiles Qt with the -journald option, all debug output is per default directed to the systemd journal (display with journalctl).

You can override this behaviour by defining QT_LOGGING_TO_CONSOLE=1 as an environment variable.