qlogging_helper.cpp

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// Copyright (C) 2016 The Qt Company Ltd.

// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only

#include <QCoreApplication>

#include <QLoggingCategory>

#include <QThread>

#ifdef Q_CC_GNU

#define NEVER_INLINE __attribute__((__noinline__))

#else

#define NEVER_INLINE

#endif

struct T {

    T() { qDebug("static constructor"); }

    ~T() { qDebug("static destructor"); }

} t;

class MyClass : public QObject

    Q_OBJECT

public slots:

    virtual NEVER_INLINE QString mySlot1();

private:

    virtual NEVER_INLINE void myFunction(int a);

};

QString MyClass::mySlot1()

    myFunction(34);

    return QString();

void MyClass::myFunction(int a)

    qDebug() << "from_a_function" << a;

class Thread : public QThread

public:

    Thread() {

        setObjectName("1234567890ABCDE"); // 16 bytes incl. NUL

protected:

    void run() final {

        qDebug("qDebug from another thread");

};

int main(int argc, char **argv)

    QCoreApplication app(argc, argv);

    app.setApplicationName("tst_qlogging");

    qSetMessagePattern("[%{type}] %{message}");

    qDebug("qDebug");

    qInfo("qInfo");

    qWarning("qWarning");

    qCritical("qCritical");

    QLoggingCategory cat("category");

    qCWarning(cat) << "qDebug with category";

    qSetMessagePattern(QString());

    qDebug("qDebug2");

    MyClass cl;

    QMetaObject::invokeMethod(&cl, "mySlot1");

    Thread thread;

    thread.start();

    thread.wait();

    return 0;

#include "qlogging_helper.moc"