logcat.pro

######################################################################
# Automatically generated by qmake (3.0) s�n okt. 22 16:45:15 2017
######################################################################

TEMPLATE = app
TARGET = logcat
INCLUDEPATH += .

# Input
SOURCES += main.cpp

main.cpp

#include <QLoggingCategory>

Q_DECLARE_LOGGING_CATEGORY(Log)
Q_LOGGING_CATEGORY(Log, "my.category")

int main(int argc, char *argv[]) {
    Q_UNUSED(argc);
    Q_UNUSED(argv);

    qCDebug(Log) << "hello";

    return 0;
}

output.txt

[estan@newton logcat]$ QT_LOGGING_RULES="my.category=false" ./logcat 
my.category: hello
[estan@newton logcat]$