qt 6.5.1 original

tests/manual/wasm/eventloop/main_noexec/CMakeLists.txt

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+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+qt_internal_add_manual_test(main_noexec
+    GUI
+    SOURCES
+        main.cpp
+    LIBRARIES
+        Qt::Core
+        Qt::Gui
+)

tests/manual/wasm/eventloop/main_noexec/main.cpp

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+// Copyright (C) 2021 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+#include <QtGui>
+
+// This example demonstrates how to create QGuiApplication
+// without calling exec(), and then exiting main() without
+// shutting down the Qt event loop.
+
+class ClickWindow: public QRasterWindow
+{
+public:
+
+    ClickWindow() {
+        qDebug() << "ClickWindow constructor";
+    }
+    ~ClickWindow() {
+        qDebug() << "ClickWindow destructor";
+    }
+
+    void paintEvent(QPaintEvent *ev) override {
+        QPainter p(this);
+        p.fillRect(ev->rect(), QColorConstants::Svg::deepskyblue);
+        p.drawText(50, 100, "Application has started. See the developer tools console for debug output");
+    }
+
+    void mousePressEvent(QMouseEvent *) override {
+        qDebug() << "mousePressEvent(): calling QGuiApplication::quit()";
+        QGuiApplication::quit();
+    }
+};
+
+int main(int argc, char **argv)
+{
+    qDebug() << "main(): Creating QGuiApplication object";
+    QGuiApplication *app = new QGuiApplication(argc, argv);
+
+    QObject::connect(app, &QCoreApplication::aboutToQuit, [](){
+        qDebug() << "QCoreApplication::aboutToQuit";
+    });
+
+    qDebug() << "main(): Creating ClickWindow object";
+    ClickWindow *window = new ClickWindow();
+    window->show();
+
+    // We can exit main; the Qt event loop and the emscripten runtime
+    // will keep running, as long as Emscriptens EXIT_RUNTIME option
+    // has not been enabled.
+
+    qDebug() << "main(): exit";
+}
+
+// Global variables are created before main() as usual, but not destroyed
+class Global
+{
+public:
+    Global() {
+        qDebug() << "Global constructor";
+    }
+    ~Global() {
+        qDebug() << "Global destructor"; // <- will not be printed
+    }
+};
+Global global;
+
+
+