qt 6.5.1 original

examples/widgets/tools/echoplugin/plugin/CMakeLists.txt

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+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+qt_add_plugin(echoplugin
+    CLASS_NAME EchoPlugin
+    echoplugin.cpp echoplugin.h
+)
+
+set_target_properties(echoplugin PROPERTIES
+    LIBRARY_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}/echowindow"
+)
+
+target_include_directories(echoplugin PRIVATE
+    ../echowindow
+)
+
+target_link_libraries(echoplugin PRIVATE
+    Qt6::Core
+    Qt6::Gui
+    Qt6::Widgets
+)
+
+install(TARGETS echoplugin
+    RUNTIME DESTINATION "${INSTALL_EXAMPLEDIR}"
+    LIBRARY DESTINATION "${INSTALL_EXAMPLEDIR}"
+)

examples/widgets/tools/echoplugin/plugin/echoplugin.cpp

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include "echoplugin.h"
+
+//! [0]
+QString EchoPlugin::echo(const QString &message)
+{
+    return message;
+}
+//! [0]

examples/widgets/tools/echoplugin/plugin/echoplugin.h

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#ifndef ECHOPLUGIN_H
+#define ECHOPLUGIN_H
+
+#include <QObject>
+#include <QtPlugin>
+#include "echointerface.h"
+
+//! [0]
+class EchoPlugin : public QObject, EchoInterface
+{
+    Q_OBJECT
+    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.Examples.EchoInterface" FILE "echoplugin.json")
+    Q_INTERFACES(EchoInterface)
+
+public:
+    QString echo(const QString &message) override;
+};
+//! [0]
+
+#endif

examples/widgets/tools/echoplugin/plugin/echoplugin.json

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+{}

examples/widgets/tools/echoplugin/plugin/plugin.pro

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+#! [0]
+TEMPLATE        = lib
+CONFIG         += plugin
+QT             += widgets
+INCLUDEPATH    += ../echowindow
+HEADERS         = echoplugin.h
+SOURCES         = echoplugin.cpp
+TARGET          = $$qtLibraryTarget(echoplugin)
+DESTDIR         = ../plugins
+#! [0]
+
+EXAMPLE_FILES = echoplugin.json
+
+# install
+target.path = $$[QT_INSTALL_EXAMPLES]/widgets/tools/echoplugin/plugins
+INSTALLS += target
+
+CONFIG += install_ok  # Do not cargo-cult this!