Instantiate static Qml plugins declaring QQmlExtensionInterface only

When instantiating static plugins no check is done whether the
QQmlExtensionInterface is declared. Therefore all user plugins are
instantiated in the Qml thread, which may cause problems.

Task-number: QTBUG-52012
Change-Id: Ia91ec5ec7b2a9721bd11e3648cdc161855b4454e
Reviewed-by: Simon Hausmann <simon.hausmann@theqtcompany.com>

42 files changed, 166 insertions, 50 deletions

diff --git a/examples/qml/qmlextensionplugins/plugin.cpp b/examples/qml/qmlextensionplugins/plugin.cpp
index 56057b7f06..e04cfa57d8 100644
--- a/examples/qml/qmlextensionplugins/plugin.cpp
+++ b/examples/qml/qmlextensionplugins/plugin.cpp
@@ -141,7 +141,7 @@ MinuteTimer *TimeModel::timer=0;
 class QExampleQmlPlugin : public QQmlExtensionPlugin
 {
     Q_OBJECT
-    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QQmlExtensionInterface")
+    Q_PLUGIN_METADATA(IID QQmlExtensionInterface_iid)
 
 public:
     void registerTypes(const char *uri)
diff --git a/examples/qml/tutorials/extending-qml/chapter6-plugins/import/chartsplugin.h b/examples/qml/tutorials/extending-qml/chapter6-plugins/import/chartsplugin.h
index 3c0f84fe34..2a9c2446bd 100644
--- a/examples/qml/tutorials/extending-qml/chapter6-plugins/import/chartsplugin.h
+++ b/examples/qml/tutorials/extending-qml/chapter6-plugins/import/chartsplugin.h
@@ -46,7 +46,7 @@
 class ChartsPlugin : public QQmlExtensionPlugin
 {
     Q_OBJECT
-    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QQmlExtensionInterface")
+    Q_PLUGIN_METADATA(IID QQmlExtensionInterface_iid)
 
 public:
     void registerTypes(const char *uri);
diff --git a/examples/quick/customitems/painteditem/TextBalloonPlugin/plugin.h b/examples/quick/customitems/painteditem/TextBalloonPlugin/plugin.h
index f1f4de7fb7..5bbede6780 100644
--- a/examples/quick/customitems/painteditem/TextBalloonPlugin/plugin.h
+++ b/examples/quick/customitems/painteditem/TextBalloonPlugin/plugin.h
@@ -38,7 +38,7 @@
 class TextBalloonPlugin : public QQmlExtensionPlugin
 {
     Q_OBJECT
-    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QQmlExtensionInterface")
+    Q_PLUGIN_METADATA(IID QQmlExtensionInterface_iid)
 public:
     void registerTypes(const char *uri)
     {
diff --git a/examples/quick/imageprovider/imageprovider.cpp b/examples/quick/imageprovider/imageprovider.cpp
index f402ce0ce8..1e4f53e736 100644
--- a/examples/quick/imageprovider/imageprovider.cpp
+++ b/examples/quick/imageprovider/imageprovider.cpp
@@ -87,7 +87,7 @@ public:
 class ImageProviderExtensionPlugin : public QQmlExtensionPlugin
 {
     Q_OBJECT
-    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QQmlExtensionInterface")
+    Q_PLUGIN_METADATA(IID QQmlExtensionInterface_iid)
 public:
     void registerTypes(const char *uri)
     {
@@ -103,7 +103,4 @@ public:
 };
 
 
-#define QQmlExtensionInterface_iid "org.qt-project.Qt.QQmlExtensionInterface"
-
-
 #include "imageprovider.moc"
diff --git a/examples/quick/imageresponseprovider/imageresponseprovider.cpp b/examples/quick/imageresponseprovider/imageresponseprovider.cpp
index bdec29114b..a888c823a6 100644
--- a/examples/quick/imageresponseprovider/imageresponseprovider.cpp
+++ b/examples/quick/imageresponseprovider/imageresponseprovider.cpp
@@ -102,7 +102,7 @@ private:
 class ImageProviderExtensionPlugin : public QQmlExtensionPlugin
 {
     Q_OBJECT
-    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QQmlExtensionInterface")
+    Q_PLUGIN_METADATA(IID QQmlExtensionInterface_iid)
 public:
     void registerTypes(const char *uri)
     {
@@ -117,7 +117,4 @@ public:
 
 };
 
-
-#define QQmlExtensionInterface_iid "org.qt-project.Qt.QQmlExtensionInterface"
-
 #include "imageresponseprovider.moc"
diff --git a/src/imports/folderlistmodel/plugin.cpp b/src/imports/folderlistmodel/plugin.cpp
index a2536bdc7d..400989d3dd 100644
--- a/src/imports/folderlistmodel/plugin.cpp
+++ b/src/imports/folderlistmodel/plugin.cpp
@@ -42,7 +42,7 @@ QT_BEGIN_NAMESPACE
 class QmlFolderListModelPlugin : public QQmlExtensionPlugin
 {
     Q_OBJECT
-    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QQmlExtensionInterface")
+    Q_PLUGIN_METADATA(IID QQmlExtensionInterface_iid)
 
 public:
     virtual void registerTypes(const char *uri)
diff --git a/src/imports/localstorage/plugin.cpp b/src/imports/localstorage/plugin.cpp
index ada50774a7..b8d7030763 100644
--- a/src/imports/localstorage/plugin.cpp
+++ b/src/imports/localstorage/plugin.cpp
@@ -741,7 +741,7 @@ static QObject *module_api_factory(QQmlEngine *engine, QJSEngine *scriptEngine)
 class QQmlLocalStoragePlugin : public QQmlExtensionPlugin
 {
     Q_OBJECT
-    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QQmlExtensionInterface")
+    Q_PLUGIN_METADATA(IID QQmlExtensionInterface_iid)
 
 public:
     QQmlLocalStoragePlugin()
diff --git a/src/imports/models/plugin.cpp b/src/imports/models/plugin.cpp
index c2b0d2ae94..0a3e96aea3 100644
--- a/src/imports/models/plugin.cpp
+++ b/src/imports/models/plugin.cpp
@@ -62,7 +62,7 @@ QT_BEGIN_NAMESPACE
 class QtQmlModelsPlugin : public QQmlExtensionPlugin
 {
     Q_OBJECT
-    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QQmlExtensionInterface/1.0")
+    Q_PLUGIN_METADATA(IID QQmlExtensionInterface_iid)
 public:
     virtual void registerTypes(const char *uri)
     {
diff --git a/src/imports/particles/plugin.cpp b/src/imports/particles/plugin.cpp
index 56b611a408..7f95b9d833 100644
--- a/src/imports/particles/plugin.cpp
+++ b/src/imports/particles/plugin.cpp
@@ -41,7 +41,7 @@ QT_BEGIN_NAMESPACE
 class QtQuick2ParticlesPlugin : public QQmlExtensionPlugin
 {
     Q_OBJECT
-    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QQmlExtensionInterface/1.0")
+    Q_PLUGIN_METADATA(IID QQmlExtensionInterface_iid)
 public:
     virtual void registerTypes(const char *uri)
     {
diff --git a/src/imports/qtquick2/plugin.cpp b/src/imports/qtquick2/plugin.cpp
index 36a57112b2..b4caf01d10 100644
--- a/src/imports/qtquick2/plugin.cpp
+++ b/src/imports/qtquick2/plugin.cpp
@@ -41,7 +41,7 @@ QT_BEGIN_NAMESPACE
 class QtQuick2Plugin : public QQmlExtensionPlugin
 {
     Q_OBJECT
-    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QQmlExtensionInterface/1.0")
+    Q_PLUGIN_METADATA(IID QQmlExtensionInterface_iid)
 public:
     virtual void registerTypes(const char *uri)
     {
diff --git a/src/imports/settings/plugin.cpp b/src/imports/settings/plugin.cpp
index c32d370537..2b4b114326 100644
--- a/src/imports/settings/plugin.cpp
+++ b/src/imports/settings/plugin.cpp
@@ -41,7 +41,7 @@ QT_BEGIN_NAMESPACE
 class QmlSettingsPlugin : public QQmlExtensionPlugin
 {
     Q_OBJECT
-    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QQmlExtensionInterface")
+    Q_PLUGIN_METADATA(IID QQmlExtensionInterface_iid)
 
 public:
     virtual void registerTypes(const char *uri)
diff --git a/src/imports/statemachine/plugin.cpp b/src/imports/statemachine/plugin.cpp
index 2d52839f68..c4947a455e 100644
--- a/src/imports/statemachine/plugin.cpp
+++ b/src/imports/statemachine/plugin.cpp
@@ -46,7 +46,7 @@ QT_BEGIN_NAMESPACE
 class QtQmlStateMachinePlugin : public QQmlExtensionPlugin
 {
     Q_OBJECT
-    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QtQml.StateMachine/1.0")
+    Q_PLUGIN_METADATA(IID QQmlExtensionInterface_iid)
 
 public:
     void registerTypes(const char *uri)
diff --git a/src/imports/testlib/main.cpp b/src/imports/testlib/main.cpp
index c42ece5da5..b90c671cba 100644
--- a/src/imports/testlib/main.cpp
+++ b/src/imports/testlib/main.cpp
@@ -134,7 +134,7 @@ QT_BEGIN_NAMESPACE
 class QTestQmlModule : public QQmlExtensionPlugin
 {
     Q_OBJECT
-    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QQmlExtensionInterface")
+    Q_PLUGIN_METADATA(IID QQmlExtensionInterface_iid)
 
 public:
     virtual void registerTypes(const char *uri)
diff --git a/src/imports/window/plugin.cpp b/src/imports/window/plugin.cpp
index 010e9b3eed..25383c20d5 100644
--- a/src/imports/window/plugin.cpp
+++ b/src/imports/window/plugin.cpp
@@ -58,7 +58,7 @@ QT_BEGIN_NAMESPACE
 class QtQuick2WindowPlugin : public QQmlExtensionPlugin
 {
     Q_OBJECT
-    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QQmlExtensionInterface/1.0")
+    Q_PLUGIN_METADATA(IID QQmlExtensionInterface_iid)
 public:
     virtual void registerTypes(const char *uri)
     {
diff --git a/src/imports/xmllistmodel/plugin.cpp b/src/imports/xmllistmodel/plugin.cpp
index 8a9d4379c4..f28dba783b 100644
--- a/src/imports/xmllistmodel/plugin.cpp
+++ b/src/imports/xmllistmodel/plugin.cpp
@@ -41,7 +41,7 @@ QT_BEGIN_NAMESPACE
 class QmlXmlListModelPlugin : public QQmlExtensionPlugin
 {
     Q_OBJECT
-    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QQmlExtensionInterface")
+    Q_PLUGIN_METADATA(IID QQmlExtensionInterface_iid)
 
 public:
     virtual void registerTypes(const char *uri)
diff --git a/src/qml/qml/qqmlimport.cpp b/src/qml/qml/qqmlimport.cpp
index d538199520..9fc01c8e35 100644
--- a/src/qml/qml/qqmlimport.cpp
+++ b/src/qml/qml/qqmlimport.cpp
@@ -850,8 +850,8 @@ bool QQmlImportsPrivate::populatePluginPairVector(QVector<StaticPluginPair> &res
         // To avoid traversing all static plugins for all imports, we cut down
         // the list the first time called to only contain QML plugins:
         foreach (const QStaticPlugin &plugin, QPluginLoader::staticPlugins()) {
-            if (qobject_cast<QQmlExtensionPlugin *>(plugin.instance()))
-               plugins.append(plugin);
+            if (plugin.metaData().value(QStringLiteral("IID")).toString() == QLatin1String(QQmlExtensionInterface_iid))
+                plugins.append(plugin);
         }
     }
 
diff --git a/tests/auto/qml/qml.pro b/tests/auto/qml/qml.pro
index 66c19098ef..62e2547641 100644
--- a/tests/auto/qml/qml.pro
+++ b/tests/auto/qml/qml.pro
@@ -70,7 +70,8 @@ qtHaveModule(widgets) {
         qjsvalue
 }
 
-SUBDIRS += $$PUBLICTESTS
+SUBDIRS += $$PUBLICTESTS \
+    qqmlextensionplugin
 SUBDIRS += $$METATYPETESTS
 !winrt { # no QProcess on winrt
     !contains(QT_CONFIG, no-qml-debug): SUBDIRS += debugger
diff --git a/tests/auto/qml/qqmlextensionplugin/qqmlextensionplugin.pro b/tests/auto/qml/qqmlextensionplugin/qqmlextensionplugin.pro
new file mode 100644
index 0000000000..af74707c4a
--- /dev/null
+++ b/tests/auto/qml/qqmlextensionplugin/qqmlextensionplugin.pro
@@ -0,0 +1,5 @@
+CONFIG   += testcase
+TARGET = tst_qqmlextensionplugin
+SOURCES += tst_qqmlextensionplugin.cpp
+osx:CONFIG -= app_bundle
+QT       += qml testlib
diff --git a/tests/auto/qml/qqmlextensionplugin/tst_qqmlextensionplugin.cpp b/tests/auto/qml/qqmlextensionplugin/tst_qqmlextensionplugin.cpp
new file mode 100644
index 0000000000..ab5e958323
--- /dev/null
+++ b/tests/auto/qml/qqmlextensionplugin/tst_qqmlextensionplugin.cpp
@@ -0,0 +1,119 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL21$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file. Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** As a special exception, The Qt Company gives you certain additional
+** rights. These rights are described in The Qt Company LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtCore>
+#include <QtTest>
+#include <QtQml>
+
+#if defined(Q_OS_WIN)
+# define SUFFIX QLatin1String(".dll")
+# define DEBUG_SUFFIX QLatin1String("d.dll")
+
+#elif defined(Q_OS_DARWIN)
+# define SUFFIX QLatin1String(".dylib")
+# define DEBUG_SUFFIX QLatin1String("_debug.dylib")
+
+# else  // Unix
+# define SUFFIX QLatin1String(".so")
+#endif
+
+
+class tst_qqmlextensionplugin : public QObject
+{
+    Q_OBJECT
+
+    bool isDuplicate(QString file, const QList<QString> & files) {
+#ifndef DEBUG_SUFFIX
+        Q_UNUSED(file)
+        Q_UNUSED(files)
+        return false;
+#else
+# ifdef QT_DEBUG
+        return !file.endsWith(DEBUG_SUFFIX) && files.contains(file.replace(SUFFIX, DEBUG_SUFFIX));
+# else
+        return file.endsWith(DEBUG_SUFFIX) && files.contains(file.replace(DEBUG_SUFFIX, SUFFIX));
+# endif
+#endif
+    }
+
+public:
+    tst_qqmlextensionplugin() {}
+
+private Q_SLOTS:
+    void iidCheck_data();
+    void iidCheck();
+};
+
+
+void tst_qqmlextensionplugin::iidCheck_data()
+{
+    QList<QString> files;
+    for (QDirIterator it(QLibraryInfo::location(QLibraryInfo::Qml2ImportsPath), QDirIterator::Subdirectories); it.hasNext(); ) {
+        QString file = it.next();
+        if (file.endsWith(SUFFIX)) {
+            files << file;
+        }
+    }
+
+    for (QMutableListIterator<QString> it(files); it.hasNext(); ) {
+        QString file = it.next();
+        if (isDuplicate(file, files)) {
+            it.remove();
+        }
+    }
+
+    QTest::addColumn<QString>("filePath");
+    foreach (const QString &file, files) {
+        QFileInfo fileInfo(file);
+        QTest::newRow(fileInfo.baseName().toLatin1().data()) << fileInfo.absoluteFilePath();
+    }
+}
+
+
+void tst_qqmlextensionplugin::iidCheck()
+{
+    QFETCH(QString, filePath);
+
+    QPluginLoader loader(filePath);
+    QVERIFY(loader.load());
+    QVERIFY(loader.instance() != Q_NULLPTR);
+
+    if (qobject_cast<QQmlExtensionPlugin *>(loader.instance())) {
+        QString iid = loader.metaData().value(QStringLiteral("IID")).toString();
+        QCOMPARE(iid, QLatin1String(QQmlExtensionInterface_iid));
+    }
+}
+
+
+QTEST_APPLESS_MAIN(tst_qqmlextensionplugin)
+#include "tst_qqmlextensionplugin.moc"
diff --git a/tests/auto/qml/qqmlmoduleplugin/invalidFirstCommandModule/plugin.cpp b/tests/auto/qml/qqmlmoduleplugin/invalidFirstCommandModule/plugin.cpp
index d6704d5e91..166987d0be 100644
--- a/tests/auto/qml/qqmlmoduleplugin/invalidFirstCommandModule/plugin.cpp
+++ b/tests/auto/qml/qqmlmoduleplugin/invalidFirstCommandModule/plugin.cpp
@@ -46,7 +46,7 @@ public:
 class MyPlugin : public QQmlExtensionPlugin
 {
     Q_OBJECT
-    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QQmlExtensionInterface")
+    Q_PLUGIN_METADATA(IID QQmlExtensionInterface_iid)
 
 public:
     MyPlugin() {}
diff --git a/tests/auto/qml/qqmlmoduleplugin/invalidNamespaceModule/plugin.cpp b/tests/auto/qml/qqmlmoduleplugin/invalidNamespaceModule/plugin.cpp
index 7f441db3e9..77c8560b5e 100644
--- a/tests/auto/qml/qqmlmoduleplugin/invalidNamespaceModule/plugin.cpp
+++ b/tests/auto/qml/qqmlmoduleplugin/invalidNamespaceModule/plugin.cpp
@@ -46,7 +46,7 @@ public:
 class MyPlugin : public QQmlExtensionPlugin
 {
     Q_OBJECT
-    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QQmlExtensionInterface")
+    Q_PLUGIN_METADATA(IID QQmlExtensionInterface_iid)
 
 public:
     MyPlugin() {}
diff --git a/tests/auto/qml/qqmlmoduleplugin/invalidStrictModule/plugin.cpp b/tests/auto/qml/qqmlmoduleplugin/invalidStrictModule/plugin.cpp
index 7f441db3e9..77c8560b5e 100644
--- a/tests/auto/qml/qqmlmoduleplugin/invalidStrictModule/plugin.cpp
+++ b/tests/auto/qml/qqmlmoduleplugin/invalidStrictModule/plugin.cpp
@@ -46,7 +46,7 @@ public:
 class MyPlugin : public QQmlExtensionPlugin
 {
     Q_OBJECT
-    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QQmlExtensionInterface")
+    Q_PLUGIN_METADATA(IID QQmlExtensionInterface_iid)
 
 public:
     MyPlugin() {}
diff --git a/tests/auto/qml/qqmlmoduleplugin/nestedPlugin/nestedPlugin.cpp b/tests/auto/qml/qqmlmoduleplugin/nestedPlugin/nestedPlugin.cpp
index 67de996bc2..e9688da98a 100644
--- a/tests/auto/qml/qqmlmoduleplugin/nestedPlugin/nestedPlugin.cpp
+++ b/tests/auto/qml/qqmlmoduleplugin/nestedPlugin/nestedPlugin.cpp
@@ -61,7 +61,7 @@ public:
 class MyPlugin : public QQmlExtensionPlugin
 {
     Q_OBJECT
-    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QQmlExtensionInterface")
+    Q_PLUGIN_METADATA(IID QQmlExtensionInterface_iid)
 
 public:
     MyPlugin() {}
diff --git a/tests/auto/qml/qqmlmoduleplugin/nonstrictModule/plugin.cpp b/tests/auto/qml/qqmlmoduleplugin/nonstrictModule/plugin.cpp
index 79ea1ba57b..370e7aa9d3 100644
--- a/tests/auto/qml/qqmlmoduleplugin/nonstrictModule/plugin.cpp
+++ b/tests/auto/qml/qqmlmoduleplugin/nonstrictModule/plugin.cpp
@@ -46,7 +46,7 @@ public:
 class MyPlugin : public QQmlExtensionPlugin
 {
     Q_OBJECT
-    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QQmlExtensionInterface")
+    Q_PLUGIN_METADATA(IID QQmlExtensionInterface_iid)
 
 public:
     MyPlugin() {}
diff --git a/tests/auto/qml/qqmlmoduleplugin/plugin.2.1/plugin.cpp b/tests/auto/qml/qqmlmoduleplugin/plugin.2.1/plugin.cpp
index 498d983882..d8d02315e8 100644
--- a/tests/auto/qml/qqmlmoduleplugin/plugin.2.1/plugin.cpp
+++ b/tests/auto/qml/qqmlmoduleplugin/plugin.2.1/plugin.cpp
@@ -58,7 +58,7 @@ private:
 class MyPlugin : public QQmlExtensionPlugin
 {
     Q_OBJECT
-    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QQmlExtensionInterface")
+    Q_PLUGIN_METADATA(IID QQmlExtensionInterface_iid)
 
 public:
     MyPlugin()
diff --git a/tests/auto/qml/qqmlmoduleplugin/plugin.2/plugin.cpp b/tests/auto/qml/qqmlmoduleplugin/plugin.2/plugin.cpp
index 092f25d369..c2e3929347 100644
--- a/tests/auto/qml/qqmlmoduleplugin/plugin.2/plugin.cpp
+++ b/tests/auto/qml/qqmlmoduleplugin/plugin.2/plugin.cpp
@@ -58,7 +58,7 @@ private:
 class MyPlugin : public QQmlExtensionPlugin
 {
     Q_OBJECT
-    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QQmlExtensionInterface")
+    Q_PLUGIN_METADATA(IID QQmlExtensionInterface_iid)
 
 public:
     MyPlugin()
diff --git a/tests/auto/qml/qqmlmoduleplugin/plugin/plugin.cpp b/tests/auto/qml/qqmlmoduleplugin/plugin/plugin.cpp
index c6cd65a366..164d2fbcc4 100644
--- a/tests/auto/qml/qqmlmoduleplugin/plugin/plugin.cpp
+++ b/tests/auto/qml/qqmlmoduleplugin/plugin/plugin.cpp
@@ -57,7 +57,7 @@ private:
 class MyPlugin : public QQmlExtensionPlugin
 {
     Q_OBJECT
-    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QQmlExtensionInterface")
+    Q_PLUGIN_METADATA(IID QQmlExtensionInterface_iid)
 
 public:
     MyPlugin()
diff --git a/tests/auto/qml/qqmlmoduleplugin/pluginMixed/plugin.cpp b/tests/auto/qml/qqmlmoduleplugin/pluginMixed/plugin.cpp
index a1c8ddf701..c117f49b52 100644
--- a/tests/auto/qml/qqmlmoduleplugin/pluginMixed/plugin.cpp
+++ b/tests/auto/qml/qqmlmoduleplugin/pluginMixed/plugin.cpp
@@ -48,7 +48,7 @@ public:
 class MyMixedPlugin : public QQmlExtensionPlugin
 {
     Q_OBJECT
-    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QQmlExtensionInterface")
+    Q_PLUGIN_METADATA(IID QQmlExtensionInterface_iid)
 
 public:
     MyMixedPlugin()
diff --git a/tests/auto/qml/qqmlmoduleplugin/pluginVersion/plugin.cpp b/tests/auto/qml/qqmlmoduleplugin/pluginVersion/plugin.cpp
index cd49b7c081..23e4dff44a 100644
--- a/tests/auto/qml/qqmlmoduleplugin/pluginVersion/plugin.cpp
+++ b/tests/auto/qml/qqmlmoduleplugin/pluginVersion/plugin.cpp
@@ -48,7 +48,7 @@ public:
 class MyMixedPlugin : public QQmlExtensionPlugin
 {
     Q_OBJECT
-    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QQmlExtensionInterface")
+    Q_PLUGIN_METADATA(IID QQmlExtensionInterface_iid)
 
 public:
     MyMixedPlugin()
diff --git a/tests/auto/qml/qqmlmoduleplugin/pluginWithQmlFile/plugin.cpp b/tests/auto/qml/qqmlmoduleplugin/pluginWithQmlFile/plugin.cpp
index bdbfee2b46..f5c8bf01bb 100644
--- a/tests/auto/qml/qqmlmoduleplugin/pluginWithQmlFile/plugin.cpp
+++ b/tests/auto/qml/qqmlmoduleplugin/pluginWithQmlFile/plugin.cpp
@@ -38,7 +38,7 @@
 class MyPlugin : public QQmlExtensionPlugin
 {
     Q_OBJECT
-    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QQmlExtensionInterface")
+    Q_PLUGIN_METADATA(IID QQmlExtensionInterface_iid)
 
 public:
     void registerTypes(const char *uri)
diff --git a/tests/auto/qml/qqmlmoduleplugin/pluginWrongCase/plugin.cpp b/tests/auto/qml/qqmlmoduleplugin/pluginWrongCase/plugin.cpp
index d243eb18db..7d33e9ee0b 100644
--- a/tests/auto/qml/qqmlmoduleplugin/pluginWrongCase/plugin.cpp
+++ b/tests/auto/qml/qqmlmoduleplugin/pluginWrongCase/plugin.cpp
@@ -57,7 +57,7 @@ private:
 class MyPlugin : public QQmlExtensionPlugin
 {
     Q_OBJECT
-    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QQmlExtensionInterface")
+    Q_PLUGIN_METADATA(IID QQmlExtensionInterface_iid)
 
 public:
     MyPlugin()
diff --git a/tests/auto/qml/qqmlmoduleplugin/preemptedStrictModule/plugin.cpp b/tests/auto/qml/qqmlmoduleplugin/preemptedStrictModule/plugin.cpp
index be58edf79f..0f086c6701 100644
--- a/tests/auto/qml/qqmlmoduleplugin/preemptedStrictModule/plugin.cpp
+++ b/tests/auto/qml/qqmlmoduleplugin/preemptedStrictModule/plugin.cpp
@@ -46,7 +46,7 @@ public:
 class MyPlugin : public QQmlExtensionPlugin
 {
     Q_OBJECT
-    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QQmlExtensionInterface")
+    Q_PLUGIN_METADATA(IID QQmlExtensionInterface_iid)
 
 public:
     MyPlugin() {}
diff --git a/tests/auto/qml/qqmlmoduleplugin/preemptiveModule/plugin.cpp b/tests/auto/qml/qqmlmoduleplugin/preemptiveModule/plugin.cpp
index 59b0cf91ed..3b674aab90 100644
--- a/tests/auto/qml/qqmlmoduleplugin/preemptiveModule/plugin.cpp
+++ b/tests/auto/qml/qqmlmoduleplugin/preemptiveModule/plugin.cpp
@@ -46,7 +46,7 @@ public:
 class MyPlugin : public QQmlExtensionPlugin
 {
     Q_OBJECT
-    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QQmlExtensionInterface")
+    Q_PLUGIN_METADATA(IID QQmlExtensionInterface_iid)
 
 public:
     MyPlugin() {}
diff --git a/tests/auto/qml/qqmlmoduleplugin/protectedModule/plugin.cpp b/tests/auto/qml/qqmlmoduleplugin/protectedModule/plugin.cpp
index 5a3a722fdf..1f748cc09a 100644
--- a/tests/auto/qml/qqmlmoduleplugin/protectedModule/plugin.cpp
+++ b/tests/auto/qml/qqmlmoduleplugin/protectedModule/plugin.cpp
@@ -45,7 +45,7 @@ public:
 class MyPlugin : public QQmlExtensionPlugin
 {
     Q_OBJECT
-    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QQmlExtensionInterface")
+    Q_PLUGIN_METADATA(IID QQmlExtensionInterface_iid)
 
 public:
     MyPlugin() {}
diff --git a/tests/auto/qml/qqmlmoduleplugin/strictModule.2/plugin.cpp b/tests/auto/qml/qqmlmoduleplugin/strictModule.2/plugin.cpp
index b23a3a8672..2e89e96e20 100644
--- a/tests/auto/qml/qqmlmoduleplugin/strictModule.2/plugin.cpp
+++ b/tests/auto/qml/qqmlmoduleplugin/strictModule.2/plugin.cpp
@@ -46,7 +46,7 @@ public:
 class MyPlugin : public QQmlExtensionPlugin
 {
     Q_OBJECT
-    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QQmlExtensionInterface")
+    Q_PLUGIN_METADATA(IID QQmlExtensionInterface_iid)
 
 public:
     MyPlugin() {}
diff --git a/tests/auto/qml/qqmlmoduleplugin/strictModule/plugin.cpp b/tests/auto/qml/qqmlmoduleplugin/strictModule/plugin.cpp
index 63204d0281..b01fccc5fb 100644
--- a/tests/auto/qml/qqmlmoduleplugin/strictModule/plugin.cpp
+++ b/tests/auto/qml/qqmlmoduleplugin/strictModule/plugin.cpp
@@ -46,7 +46,7 @@ public:
 class MyPlugin : public QQmlExtensionPlugin
 {
     Q_OBJECT
-    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QQmlExtensionInterface")
+    Q_PLUGIN_METADATA(IID QQmlExtensionInterface_iid)
 
 public:
     MyPlugin() {}
diff --git a/tests/auto/qml/qqmltypeloader/SlowImport/plugin.h b/tests/auto/qml/qqmltypeloader/SlowImport/plugin.h
index 2b227c846c..1e4705e7d4 100644
--- a/tests/auto/qml/qqmltypeloader/SlowImport/plugin.h
+++ b/tests/auto/qml/qqmltypeloader/SlowImport/plugin.h
@@ -40,7 +40,7 @@
 class SlowPlugin : public QQmlExtensionPlugin
 {
     Q_OBJECT
-    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QQmlExtensionInterface")
+    Q_PLUGIN_METADATA(IID QQmlExtensionInterface_iid)
 
 public:
     void registerTypes(const char *uri);
diff --git a/tests/manual/highdpi/imageprovider.cpp b/tests/manual/highdpi/imageprovider.cpp
index 1856a1ea9a..33a69cb87e 100644
--- a/tests/manual/highdpi/imageprovider.cpp
+++ b/tests/manual/highdpi/imageprovider.cpp
@@ -79,7 +79,7 @@ public:
 class ImageProviderExtensionPlugin : public QQmlExtensionPlugin
 {
     Q_OBJECT
-    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QQmlExtensionInterface")
+    Q_PLUGIN_METADATA(IID QQmlExtensionInterface_iid)
 public:
     void registerTypes(const char *uri)
     {
@@ -95,7 +95,4 @@ public:
 };
 
 
-#define QQmlExtensionInterface_iid "org.qt-project.Qt.QQmlExtensionInterface"
-
-
 #include "imageprovider.moc"
diff --git a/tests/manual/qmlplugindump/tests/dumper/Dummy/dummy_plugin.h b/tests/manual/qmlplugindump/tests/dumper/Dummy/dummy_plugin.h
index 8bb1a7bd16..c7cc1540ee 100644
--- a/tests/manual/qmlplugindump/tests/dumper/Dummy/dummy_plugin.h
+++ b/tests/manual/qmlplugindump/tests/dumper/Dummy/dummy_plugin.h
@@ -39,7 +39,7 @@
 class DummyPlugin : public QQmlExtensionPlugin
 {
     Q_OBJECT
-    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QQmlExtensionInterface")
+    Q_PLUGIN_METADATA(IID QQmlExtensionInterface_iid)
 
 public:
     void registerTypes(const char *uri);
diff --git a/tests/manual/qmlplugindump/tests/dumper/Imports/imports_plugin.h b/tests/manual/qmlplugindump/tests/dumper/Imports/imports_plugin.h
index e48dabd5e0..b576679fb1 100644
--- a/tests/manual/qmlplugindump/tests/dumper/Imports/imports_plugin.h
+++ b/tests/manual/qmlplugindump/tests/dumper/Imports/imports_plugin.h
@@ -39,7 +39,7 @@
 class ImportsPlugin : public QQmlExtensionPlugin
 {
     Q_OBJECT
-    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QQmlExtensionInterface")
+    Q_PLUGIN_METADATA(IID QQmlExtensionInterface_iid)
 
 public:
     void registerTypes(const char *uri);
diff --git a/tests/manual/qmlplugindump/tests/dumper/Versions/versions_plugin.h b/tests/manual/qmlplugindump/tests/dumper/Versions/versions_plugin.h
index 8466f6ec63..7bc0441a4d 100644
--- a/tests/manual/qmlplugindump/tests/dumper/Versions/versions_plugin.h
+++ b/tests/manual/qmlplugindump/tests/dumper/Versions/versions_plugin.h
@@ -39,7 +39,7 @@
 class VersionsPlugin : public QQmlExtensionPlugin
 {
     Q_OBJECT
-    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QQmlExtensionInterface")
+    Q_PLUGIN_METADATA(IID QQmlExtensionInterface_iid)
 
 public:
     void registerTypes(const char *uri);
diff --git a/tests/manual/qmltypememory/TestPlugin/plugin.cpp b/tests/manual/qmltypememory/TestPlugin/plugin.cpp
index ddc5430b43..d6cbf05a55 100644
--- a/tests/manual/qmltypememory/TestPlugin/plugin.cpp
+++ b/tests/manual/qmltypememory/TestPlugin/plugin.cpp
@@ -50,7 +50,7 @@ class TestType : public QObject
 class TestPlugin : public QQmlExtensionPlugin
 {
     Q_OBJECT
-    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QQmlExtensionInterface")
+    Q_PLUGIN_METADATA(IID QQmlExtensionInterface_iid)
 
 public:
     void registerTypes(const char *uri)