Use simpler Plugin::initialize() when feasible

Change-Id: I567965d266f20526bda9f823e31a04b354d53fb1
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

132 files changed, 138 insertions, 399 deletions

diff --git a/src/libs/extensionsystem/iplugin.h b/src/libs/extensionsystem/iplugin.h
index 9c0bdea894..188797a264 100644
--- a/src/libs/extensionsystem/iplugin.h
+++ b/src/libs/extensionsystem/iplugin.h
@@ -31,7 +31,6 @@ public:
     ~IPlugin() override;
 
     virtual bool initialize(const QStringList &arguments, QString *errorString);
-    virtual void initialize() {}
     virtual void extensionsInitialized() {}
     virtual bool delayedInitialize() { return false; }
     virtual ShutdownFlag aboutToShutdown() { return SynchronousShutdown; }
@@ -42,6 +41,9 @@ public:
 
     PluginSpec *pluginSpec() const;
 
+protected:
+    virtual void initialize() {}
+
 signals:
     void asynchronousShutdownFinished();
 
diff --git a/src/plugins/android/androidplugin.cpp b/src/plugins/android/androidplugin.cpp
index 38c58f5a02..070a62a1ba 100644
--- a/src/plugins/android/androidplugin.cpp
+++ b/src/plugins/android/androidplugin.cpp
@@ -121,11 +121,8 @@ AndroidPlugin::~AndroidPlugin()
     delete d;
 }
 
-bool AndroidPlugin::initialize(const QStringList &arguments, QString *errorMessage)
+void AndroidPlugin::initialize()
 {
-    Q_UNUSED(arguments)
-    Q_UNUSED(errorMessage)
-
     d = new AndroidPluginPrivate;
 
     connect(KitManager::instance(), &KitManager::kitsLoaded,
@@ -135,7 +132,6 @@ bool AndroidPlugin::initialize(const QStringList &arguments, QString *errorMessa
         {Android::Constants::JLS_SETTINGS_ID,
          Tr::tr("Java Language Server"),
          [] { return new JLSSettings; }});
-    return true;
 }
 
 void AndroidPlugin::kitsRestored()
diff --git a/src/plugins/android/androidplugin.h b/src/plugins/android/androidplugin.h
index 639d079010..d0eb8d9507 100644
--- a/src/plugins/android/androidplugin.h
+++ b/src/plugins/android/androidplugin.h
@@ -15,7 +15,7 @@ class AndroidPlugin final : public ExtensionSystem::IPlugin
 
     ~AndroidPlugin() final;
 
-    bool initialize(const QStringList &arguments, QString *errorMessage) final;
+    void initialize() final;
 
     void kitsRestored();
     void askUserAboutAndroidSetup();
diff --git a/src/plugins/autotest/autotestplugin.cpp b/src/plugins/autotest/autotestplugin.cpp
index 3e73fde54e..3f8c2ff819 100644
--- a/src/plugins/autotest/autotestplugin.cpp
+++ b/src/plugins/autotest/autotestplugin.cpp
@@ -276,17 +276,13 @@ void AutotestPluginPrivate::initializeMenuEntries()
             this, &AutotestPlugin::updateMenuItemsEnabledState);
 }
 
-bool AutotestPlugin::initialize(const QStringList &arguments, QString *errorString)
+void AutotestPlugin::initialize()
 {
-    Q_UNUSED(arguments)
-    Q_UNUSED(errorString)
-
     dd = new AutotestPluginPrivate;
 #ifdef WITH_TESTS
     ExtensionSystem::PluginManager::registerScenario("TestModelManagerInterface",
                    [] { return dd->m_loadProjectScenario(); });
 #endif
-    return true;
 }
 
 void AutotestPlugin::extensionsInitialized()
diff --git a/src/plugins/autotest/autotestplugin.h b/src/plugins/autotest/autotestplugin.h
index 536597582e..71d6b8e5ee 100644
--- a/src/plugins/autotest/autotestplugin.h
+++ b/src/plugins/autotest/autotestplugin.h
@@ -39,7 +39,7 @@ public:
     AutotestPlugin();
     ~AutotestPlugin() override;
 
-    bool initialize(const QStringList &arguments, QString *errorString) override;
+    void initialize() override;
     void extensionsInitialized() override;
     ShutdownFlag aboutToShutdown() override;
 
diff --git a/src/plugins/autotoolsprojectmanager/autotoolsprojectplugin.cpp b/src/plugins/autotoolsprojectmanager/autotoolsprojectplugin.cpp
index da958c03a6..4a33802473 100644
--- a/src/plugins/autotoolsprojectmanager/autotoolsprojectplugin.cpp
+++ b/src/plugins/autotoolsprojectmanager/autotoolsprojectplugin.cpp
@@ -63,15 +63,10 @@ AutotoolsProjectPlugin::~AutotoolsProjectPlugin()
 void AutotoolsProjectPlugin::extensionsInitialized()
 { }
 
-bool AutotoolsProjectPlugin::initialize(const QStringList &arguments, QString *errorString)
+void AutotoolsProjectPlugin::initialize()
 {
-    Q_UNUSED(arguments)
-    Q_UNUSED(errorString)
-
     d = new AutotoolsProjectPluginPrivate;
     ProjectExplorer::ProjectManager::registerProjectType<AutotoolsProject>(Constants::MAKEFILE_MIMETYPE);
-
-    return true;
 }
 
 } // AutotoolsProjectManager::Internal
diff --git a/src/plugins/autotoolsprojectmanager/autotoolsprojectplugin.h b/src/plugins/autotoolsprojectmanager/autotoolsprojectplugin.h
index 8653a5f232..a705da891d 100644
--- a/src/plugins/autotoolsprojectmanager/autotoolsprojectplugin.h
+++ b/src/plugins/autotoolsprojectmanager/autotoolsprojectplugin.h
@@ -43,7 +43,7 @@ class AutotoolsProjectPlugin final : public ExtensionSystem::IPlugin
     ~AutotoolsProjectPlugin() final;
 
     void extensionsInitialized() final;
-    bool initialize(const QStringList &arguments, QString *errorString) final;
+    void initialize() final;
 
     class AutotoolsProjectPluginPrivate *d;
 };
diff --git a/src/plugins/baremetal/baremetalplugin.cpp b/src/plugins/baremetal/baremetalplugin.cpp
index 0a262e2467..f97bf1b40c 100644
--- a/src/plugins/baremetal/baremetalplugin.cpp
+++ b/src/plugins/baremetal/baremetalplugin.cpp
@@ -66,13 +66,9 @@ BareMetalPlugin::~BareMetalPlugin()
     delete d;
 }
 
-bool BareMetalPlugin::initialize(const QStringList &arguments, QString *errorString)
+void BareMetalPlugin::initialize()
 {
-    Q_UNUSED(arguments)
-    Q_UNUSED(errorString)
-
     d = new BareMetalPluginPrivate;
-    return true;
 }
 
 void BareMetalPlugin::extensionsInitialized()
diff --git a/src/plugins/baremetal/baremetalplugin.h b/src/plugins/baremetal/baremetalplugin.h
index 3bf01534d0..cbad40df5c 100644
--- a/src/plugins/baremetal/baremetalplugin.h
+++ b/src/plugins/baremetal/baremetalplugin.h
@@ -15,7 +15,7 @@ class BareMetalPlugin final : public ExtensionSystem::IPlugin
 
    ~BareMetalPlugin() final;
 
-   bool initialize(const QStringList &arguments, QString *errorString) final;
+   void initialize() final;
    void extensionsInitialized() final;
 
    class BareMetalPluginPrivate *d = nullptr;
diff --git a/src/plugins/bazaar/bazaarplugin.cpp b/src/plugins/bazaar/bazaarplugin.cpp
index 777809407a..5775380b13 100644
--- a/src/plugins/bazaar/bazaarplugin.cpp
+++ b/src/plugins/bazaar/bazaarplugin.cpp
@@ -334,12 +334,9 @@ BazaarPlugin::~BazaarPlugin()
     d = nullptr;
 }
 
-bool BazaarPlugin::initialize(const QStringList &arguments, QString *errorMessage)
+void BazaarPlugin::initialize()
 {
-    Q_UNUSED(arguments)
-    Q_UNUSED(errorMessage)
     d = new BazaarPluginPrivate;
-    return true;
 }
 
 void BazaarPlugin::extensionsInitialized()
diff --git a/src/plugins/bazaar/bazaarplugin.h b/src/plugins/bazaar/bazaarplugin.h
index 9f483d3ec6..34a42ca9ae 100644
--- a/src/plugins/bazaar/bazaarplugin.h
+++ b/src/plugins/bazaar/bazaarplugin.h
@@ -14,7 +14,7 @@ class BazaarPlugin final : public ExtensionSystem::IPlugin
 
     ~BazaarPlugin() final;
 
-    bool initialize(const QStringList &arguments, QString *errorMessage) final;
+    void initialize() final;
     void extensionsInitialized() final;
 
 #ifdef WITH_TESTS
diff --git a/src/plugins/beautifier/beautifierplugin.cpp b/src/plugins/beautifier/beautifierplugin.cpp
index f2e1513f27..9e0b3f49e8 100644
--- a/src/plugins/beautifier/beautifierplugin.cpp
+++ b/src/plugins/beautifier/beautifierplugin.cpp
@@ -91,16 +91,12 @@ public:
 
 static BeautifierPluginPrivate *dd = nullptr;
 
-bool BeautifierPlugin::initialize(const QStringList &arguments, QString *errorString)
+void BeautifierPlugin::initialize()
 {
-    Q_UNUSED(arguments)
-    Q_UNUSED(errorString)
-
     Core::ActionContainer *menu = Core::ActionManager::createMenu(Constants::MENU_ID);
     menu->menu()->setTitle(Tr::tr("Bea&utifier"));
     menu->setOnAllDisabledBehavior(Core::ActionContainer::Show);
     Core::ActionManager::actionContainer(Core::Constants::M_TOOLS)->addMenu(menu);
-    return true;
 }
 
 void BeautifierPlugin::extensionsInitialized()
diff --git a/src/plugins/beautifier/beautifierplugin.h b/src/plugins/beautifier/beautifierplugin.h
index acd902c5c6..8b3d89ed21 100644
--- a/src/plugins/beautifier/beautifierplugin.h
+++ b/src/plugins/beautifier/beautifierplugin.h
@@ -24,7 +24,7 @@ public:
     static void showError(const QString &error);
 
 private:
-    bool initialize(const QStringList &arguments, QString *errorString) override;
+    void initialize() override;
     void extensionsInitialized() override;
     ShutdownFlag aboutToShutdown() override;
 };
diff --git a/src/plugins/bineditor/bineditorplugin.cpp b/src/plugins/bineditor/bineditorplugin.cpp
index f08097b073..aa6c190dc6 100644
--- a/src/plugins/bineditor/bineditorplugin.cpp
+++ b/src/plugins/bineditor/bineditorplugin.cpp
@@ -502,14 +502,9 @@ BinEditorPlugin::~BinEditorPlugin()
     dd = nullptr;
 }
 
-bool BinEditorPlugin::initialize(const QStringList &arguments, QString *errorMessage)
+void BinEditorPlugin::initialize()
 {
-    Q_UNUSED(arguments)
-    Q_UNUSED(errorMessage)
-
     dd = new BinEditorPluginPrivate;
-
-    return true;
 }
 
 } // BinEditor::Internal
diff --git a/src/plugins/bineditor/bineditorplugin.h b/src/plugins/bineditor/bineditorplugin.h
index 00bcba3c4f..ac91a508b8 100644
--- a/src/plugins/bineditor/bineditorplugin.h
+++ b/src/plugins/bineditor/bineditorplugin.h
@@ -16,7 +16,7 @@ class BinEditorPlugin : public ExtensionSystem::IPlugin
 
     ~BinEditorPlugin() override;
 
-    bool initialize(const QStringList &arguments, QString *errorMessage) final;
+    void initialize() final;
     void extensionsInitialized() final {}
 };
 
diff --git a/src/plugins/bookmarks/bookmarksplugin.cpp b/src/plugins/bookmarks/bookmarksplugin.cpp
index 929f63515a..2f25571b53 100644
--- a/src/plugins/bookmarks/bookmarksplugin.cpp
+++ b/src/plugins/bookmarks/bookmarksplugin.cpp
@@ -67,10 +67,9 @@ BookmarksPlugin::~BookmarksPlugin()
     delete d;
 }
 
-bool BookmarksPlugin::initialize(const QStringList &, QString *)
+void BookmarksPlugin::initialize()
 {
     d = new BookmarksPluginPrivate;
-    return true;
 }
 
 BookmarksPluginPrivate::BookmarksPluginPrivate()
diff --git a/src/plugins/bookmarks/bookmarksplugin.h b/src/plugins/bookmarks/bookmarksplugin.h
index d22dae1c91..06764043c7 100644
--- a/src/plugins/bookmarks/bookmarksplugin.h
+++ b/src/plugins/bookmarks/bookmarksplugin.h
@@ -14,7 +14,7 @@ class BookmarksPlugin final : public ExtensionSystem::IPlugin
 
     ~BookmarksPlugin() final;
 
-    bool initialize(const QStringList &arguments, QString *errorMessage) final;
+    void initialize() final;
 
     class BookmarksPluginPrivate *d = nullptr;
 };
diff --git a/src/plugins/boot2qt/qdbplugin.cpp b/src/plugins/boot2qt/qdbplugin.cpp
index 7e1882c167..ee14e08a7b 100644
--- a/src/plugins/boot2qt/qdbplugin.cpp
+++ b/src/plugins/boot2qt/qdbplugin.cpp
@@ -164,16 +164,11 @@ QdbPlugin::~QdbPlugin()
     delete d;
 }
 
-bool QdbPlugin::initialize(const QStringList &arguments, QString *errorString)
+void QdbPlugin::initialize()
 {
-    Q_UNUSED(arguments)
-    Q_UNUSED(errorString)
-
     d = new QdbPluginPrivate;
 
     registerFlashAction(this);
-
-    return true;
 }
 
 void QdbPlugin::extensionsInitialized()
diff --git a/src/plugins/boot2qt/qdbplugin.h b/src/plugins/boot2qt/qdbplugin.h
index ff0b6de522..0f2b75a8ac 100644
--- a/src/plugins/boot2qt/qdbplugin.h
+++ b/src/plugins/boot2qt/qdbplugin.h
@@ -17,7 +17,7 @@ public:
     ~QdbPlugin() final;
 
 private:
-    bool initialize(const QStringList &arguments, QString *errorString) final;
+    void initialize() final;
     void extensionsInitialized() final;
     ShutdownFlag aboutToShutdown() final;
 
diff --git a/src/plugins/clangcodemodel/clangcodemodelplugin.cpp b/src/plugins/clangcodemodel/clangcodemodelplugin.cpp
index 3bec0cd749..e974152584 100644
--- a/src/plugins/clangcodemodel/clangcodemodelplugin.cpp
+++ b/src/plugins/clangcodemodel/clangcodemodelplugin.cpp
@@ -76,11 +76,8 @@ ClangCodeModelPlugin::~ClangCodeModelPlugin()
     m_generatorWatcher.waitForFinished();
 }
 
-bool ClangCodeModelPlugin::initialize(const QStringList &arguments, QString *errorMessage)
+void ClangCodeModelPlugin::initialize()
 {
-    Q_UNUSED(arguments)
-    Q_UNUSED(errorMessage)
-
     TaskHub::addCategory(Constants::TASK_CATEGORY_DIAGNOSTICS,
                                           Tr::tr("Clang Code Model"));
 
@@ -93,8 +90,6 @@ bool ClangCodeModelPlugin::initialize(const QStringList &arguments, QString *err
                 std::make_unique<ClangModelManagerSupport>());
 
     createCompilationDBAction();
-
-    return true;
 }
 
 void ClangCodeModelPlugin::createCompilationDBAction()
diff --git a/src/plugins/clangcodemodel/clangcodemodelplugin.h b/src/plugins/clangcodemodel/clangcodemodelplugin.h
index 6b75adc466..6f4d9af653 100644
--- a/src/plugins/clangcodemodel/clangcodemodelplugin.h
+++ b/src/plugins/clangcodemodel/clangcodemodelplugin.h
@@ -21,12 +21,11 @@ class ClangCodeModelPlugin final: public ExtensionSystem::IPlugin
 
 public:
     ~ClangCodeModelPlugin() override;
-    bool initialize(const QStringList &arguments, QString *errorMessage) override;
+    void initialize() override;
 
 private:
     void maybeHandleBatchFileAndExit() const;
 
-private:
     void generateCompilationDB();
     void createCompilationDBAction();
 
diff --git a/src/plugins/clangformat/clangformatplugin.cpp b/src/plugins/clangformat/clangformatplugin.cpp
index d8428e35f0..cbb49cbd31 100644
--- a/src/plugins/clangformat/clangformatplugin.cpp
+++ b/src/plugins/clangformat/clangformatplugin.cpp
@@ -87,10 +87,8 @@ static void replaceCppCodeStyle()
     TextEditorSettings::registerCodeStyleFactory(new ClangFormatStyleFactory);
 }
 
-bool ClangFormatPlugin::initialize(const QStringList &arguments, QString *errorString)
+void ClangFormatPlugin::initialize()
 {
-    Q_UNUSED(arguments)
-    Q_UNUSED(errorString)
     replaceCppCodeStyle();
 
     ActionContainer *contextMenu = ActionManager::actionContainer(CppEditor::Constants::M_CONTEXT);
@@ -127,7 +125,6 @@ bool ClangFormatPlugin::initialize(const QStringList &arguments, QString *errorS
                         openClangFormatConfigAction->setData(doc->filePath().toVariant());
                 });
     }
-    return true;
 }
 
 QVector<QObject *> ClangFormatPlugin::createTestObjects() const
diff --git a/src/plugins/clangformat/clangformatplugin.h b/src/plugins/clangformat/clangformatplugin.h
index c6915768db..7b3560c4ee 100644
--- a/src/plugins/clangformat/clangformatplugin.h
+++ b/src/plugins/clangformat/clangformatplugin.h
@@ -12,7 +12,7 @@ class ClangFormatPlugin : public ExtensionSystem::IPlugin
     Q_OBJECT
     Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QtCreatorPlugin" FILE "ClangFormat.json")
 
-    bool initialize(const QStringList &arguments, QString *errorString) final;
+    void initialize() final;
     QVector<QObject *> createTestObjects() const override;
 };
 
diff --git a/src/plugins/clangtools/clangtoolsplugin.cpp b/src/plugins/clangtools/clangtoolsplugin.cpp
index 23e841fa36..c8be34202a 100644
--- a/src/plugins/clangtools/clangtoolsplugin.cpp
+++ b/src/plugins/clangtools/clangtoolsplugin.cpp
@@ -88,11 +88,8 @@ ClangToolsPlugin::~ClangToolsPlugin()
     delete d;
 }
 
-bool ClangToolsPlugin::initialize(const QStringList &arguments, QString *errorString)
+void ClangToolsPlugin::initialize()
 {
-    Q_UNUSED(arguments)
-    Q_UNUSED(errorString)
-
     TaskHub::addCategory(taskCategory(), Tr::tr("Clang Tools"));
 
     // Import tidy/clazy diagnostic configs from CppEditor now
@@ -115,8 +112,6 @@ bool ClangToolsPlugin::initialize(const QStringList &arguments, QString *errorSt
             &Core::EditorManager::currentEditorChanged,
             this,
             &ClangToolsPlugin::onCurrentEditorChanged);
-
-    return true;
 }
 
 void ClangToolsPlugin::onCurrentEditorChanged()
diff --git a/src/plugins/clangtools/clangtoolsplugin.h b/src/plugins/clangtools/clangtoolsplugin.h
index 7def8bab60..e08978ad5e 100644
--- a/src/plugins/clangtools/clangtoolsplugin.h
+++ b/src/plugins/clangtools/clangtoolsplugin.h
@@ -23,7 +23,7 @@ public:
     ~ClangToolsPlugin() final;
 
 private:
-    bool initialize(const QStringList &arguments, QString *errorString) final;
+    void initialize() final;
     void registerAnalyzeActions();
     void onCurrentEditorChanged();
 
diff --git a/src/plugins/classview/classviewplugin.cpp b/src/plugins/classview/classviewplugin.cpp
index 4364d61f1d..e65e6c1e9e 100644
--- a/src/plugins/classview/classviewplugin.cpp
+++ b/src/plugins/classview/classviewplugin.cpp
@@ -34,14 +34,9 @@ ClassViewPlugin::~ClassViewPlugin()
     dd = nullptr;
 }
 
-bool ClassViewPlugin::initialize(const QStringList &arguments, QString *errorMessage)
+void ClassViewPlugin::initialize()
 {
-    Q_UNUSED(arguments)
-    Q_UNUSED(errorMessage)
-
     dd = new ClassViewPluginPrivate;
-
-    return true;
 }
 
 } // namespace Internal
diff --git a/src/plugins/classview/classviewplugin.h b/src/plugins/classview/classviewplugin.h
index 778cb74c25..48a69e748d 100644
--- a/src/plugins/classview/classviewplugin.h
+++ b/src/plugins/classview/classviewplugin.h
@@ -18,7 +18,7 @@ public:
     ~ClassViewPlugin() final;
 
 private:
-    bool initialize(const QStringList &arguments, QString *errorMessage = nullptr) final;
+    void initialize() final;
     void extensionsInitialized() final {}
 };
 
diff --git a/src/plugins/clearcase/clearcaseplugin.cpp b/src/plugins/clearcase/clearcaseplugin.cpp
index 998c650603..9a18236b81 100644
--- a/src/plugins/clearcase/clearcaseplugin.cpp
+++ b/src/plugins/clearcase/clearcaseplugin.cpp
@@ -560,11 +560,9 @@ QString ClearCasePluginPrivate::findTopLevel(const FilePath &directory) const
     return ccManagesDirectory(directory);
 }
 
-bool ClearCasePlugin::initialize(const QStringList & /*arguments */, QString *errorMessage)
+void ClearCasePlugin::initialize()
 {
-    Q_UNUSED(errorMessage)
     dd = new ClearCasePluginPrivate;
-    return true;
 }
 
 void ClearCasePlugin::extensionsInitialized()
diff --git a/src/plugins/clearcase/clearcaseplugin.h b/src/plugins/clearcase/clearcaseplugin.h
index 9293b985a1..99fa3342ad 100644
--- a/src/plugins/clearcase/clearcaseplugin.h
+++ b/src/plugins/clearcase/clearcaseplugin.h
@@ -67,7 +67,7 @@ public:
     static QSharedPointer<StatusMap> statusMap();
 
 private:
-    bool initialize(const QStringList &arguments, QString *error_message) final;
+    void initialize() final;
     void extensionsInitialized() final;
 
 #ifdef WITH_TESTS
diff --git a/src/plugins/cmakeprojectmanager/cmakeprojectplugin.cpp b/src/plugins/cmakeprojectmanager/cmakeprojectplugin.cpp
index 9caa5b3d86..eabfacbd46 100644
--- a/src/plugins/cmakeprojectmanager/cmakeprojectplugin.cpp
+++ b/src/plugins/cmakeprojectmanager/cmakeprojectplugin.cpp
@@ -149,10 +149,8 @@ CMakeProjectPlugin::~CMakeProjectPlugin()
     delete d;
 }
 
-bool CMakeProjectPlugin::initialize(const QStringList & /*arguments*/, QString *errorMessage)
+void CMakeProjectPlugin::initialize()
 {
-    Q_UNUSED(errorMessage)
-
     d = new CMakeProjectPluginPrivate;
     projectTypeSpecificSettings()->readSettings(ICore::settings());
 
@@ -195,8 +193,6 @@ bool CMakeProjectPlugin::initialize(const QStringList & /*arguments*/, QString *
 
     d->cmakeFormatter.initialize();
     d->updateActions();
-
-    return true;
 }
 
 void CMakeProjectPlugin::extensionsInitialized()
diff --git a/src/plugins/cmakeprojectmanager/cmakeprojectplugin.h b/src/plugins/cmakeprojectmanager/cmakeprojectplugin.h
index 81f2c35d93..86c7cf6356 100644
--- a/src/plugins/cmakeprojectmanager/cmakeprojectplugin.h
+++ b/src/plugins/cmakeprojectmanager/cmakeprojectplugin.h
@@ -36,7 +36,7 @@ private slots:
 #endif
 
 private:
-    bool initialize(const QStringList &arguments, QString *errorMessage) final;
+    void initialize() final;
     void extensionsInitialized() final;
 
     void updateContextActions(ProjectExplorer::Node *node);
diff --git a/src/plugins/coco/cocoplugin.cpp b/src/plugins/coco/cocoplugin.cpp
index f3a2969276..3601e934f9 100644
--- a/src/plugins/coco/cocoplugin.cpp
+++ b/src/plugins/coco/cocoplugin.cpp
@@ -86,7 +86,7 @@ CocoPlugin::~CocoPlugin()
     delete d;
 }
 
-bool CocoPlugin::initialize(const QStringList &, QString *)
+void CocoPlugin::initialize()
 {
     using namespace Core;
     ActionContainer *menu = ActionManager::actionContainer(Debugger::Constants::M_DEBUG_ANALYZER);
@@ -97,7 +97,6 @@ bool CocoPlugin::initialize(const QStringList &, QString *)
 
         connect(startCoco, &QAction::triggered, this, [this]() { d->startCoco(); });
     }
-    return true;
 }
 
 } // namespace Coco
diff --git a/src/plugins/coco/cocoplugin.h b/src/plugins/coco/cocoplugin.h
index a2c429cbb9..919acfbff4 100644
--- a/src/plugins/coco/cocoplugin.h
+++ b/src/plugins/coco/cocoplugin.h
@@ -18,7 +18,7 @@ public:
     CocoPlugin();
     ~CocoPlugin() override;
 
-    bool initialize(const QStringList &arguments, QString *errorString) override;
+    void initialize() override;
 private:
     CocoPluginPrivate *d;
 };
diff --git a/src/plugins/compilationdatabaseprojectmanager/compilationdatabaseprojectmanagerplugin.cpp b/src/plugins/compilationdatabaseprojectmanager/compilationdatabaseprojectmanagerplugin.cpp
index 20c1ad8d09..7f220244b0 100644
--- a/src/plugins/compilationdatabaseprojectmanager/compilationdatabaseprojectmanagerplugin.cpp
+++ b/src/plugins/compilationdatabaseprojectmanager/compilationdatabaseprojectmanagerplugin.cpp
@@ -42,11 +42,8 @@ CompilationDatabaseProjectManagerPlugin::~CompilationDatabaseProjectManagerPlugi
     delete d;
 }
 
-bool CompilationDatabaseProjectManagerPlugin::initialize(const QStringList &arguments, QString *errorMessage)
+void CompilationDatabaseProjectManagerPlugin::initialize()
 {
-    Q_UNUSED(arguments)
-    Q_UNUSED(errorMessage)
-
     d = new CompilationDatabaseProjectManagerPluginPrivate;
 
     Utils::FileIconProvider::registerIconOverlayForFilename(Utils::Icons::PROJECT.imageFilePath().toString(),
@@ -80,8 +77,6 @@ bool CompilationDatabaseProjectManagerPlugin::initialize(const QStringList &argu
 
     connect(ProjectTree::instance(), &ProjectTree::currentProjectChanged,
             this, onProjectChanged);
-
-    return true;
 }
 
 QVector<QObject *> CompilationDatabaseProjectManagerPlugin::createTestObjects() const
diff --git a/src/plugins/compilationdatabaseprojectmanager/compilationdatabaseprojectmanagerplugin.h b/src/plugins/compilationdatabaseprojectmanager/compilationdatabaseprojectmanagerplugin.h
index 8807bc4200..251138ba69 100644
--- a/src/plugins/compilationdatabaseprojectmanager/compilationdatabaseprojectmanagerplugin.h
+++ b/src/plugins/compilationdatabaseprojectmanager/compilationdatabaseprojectmanagerplugin.h
@@ -15,7 +15,7 @@ class CompilationDatabaseProjectManagerPlugin final : public ExtensionSystem::IP
 
     ~CompilationDatabaseProjectManagerPlugin();
 
-    bool initialize(const QStringList &arguments, QString *errorMessage) final;
+    void initialize() final;
     QVector<QObject *> createTestObjects() const final;
 
     class CompilationDatabaseProjectManagerPluginPrivate *d = nullptr;
diff --git a/src/plugins/conan/conanplugin.cpp b/src/plugins/conan/conanplugin.cpp
index 5b432bf216..a1a78acca3 100644
--- a/src/plugins/conan/conanplugin.cpp
+++ b/src/plugins/conan/conanplugin.cpp
@@ -34,21 +34,13 @@ ConanPlugin::~ConanPlugin()
     delete d;
 }
 
-void ConanPlugin::extensionsInitialized()
-{ }
-
-bool ConanPlugin::initialize(const QStringList &arguments, QString *errorString)
+void ConanPlugin::initialize()
 {
-    Q_UNUSED(arguments)
-    Q_UNUSED(errorString)
-
     d = new ConanPluginPrivate;
     conanSettings()->readSettings(ICore::settings());
 
     connect(SessionManager::instance(), &SessionManager::projectAdded,
             this, &ConanPlugin::projectAdded);
-
-    return true;
 }
 
 static void connectTarget(Project *project, Target *target)
diff --git a/src/plugins/conan/conanplugin.h b/src/plugins/conan/conanplugin.h
index 46b7b2618c..59fbe976d2 100644
--- a/src/plugins/conan/conanplugin.h
+++ b/src/plugins/conan/conanplugin.h
@@ -26,8 +26,7 @@ private:
     ~ConanPlugin() final;
     void projectAdded(ProjectExplorer::Project *project);
 
-    void extensionsInitialized() final;
-    bool initialize(const QStringList &arguments, QString *errorString) final;
+    void initialize() final;
 
     class ConanPluginPrivate *d = nullptr;
 };
diff --git a/src/plugins/coreplugin/iwizardfactory.cpp b/src/plugins/coreplugin/iwizardfactory.cpp
index a30637e08c..3571353105 100644
--- a/src/plugins/coreplugin/iwizardfactory.cpp
+++ b/src/plugins/coreplugin/iwizardfactory.cpp
@@ -44,7 +44,7 @@
     To make your wizard known to the system, add your IWizardFactory instance to the
     plugin manager's object pool in your plugin's initialize function:
     \code
-        bool MyPlugin::initialize(const QStringList &arguments, QString *errorString)
+        void MyPlugin::initialize()
         {
             // ... do setup
             addAutoReleasedObject(new MyWizardFactory);
diff --git a/src/plugins/cpaster/cpasterplugin.cpp b/src/plugins/cpaster/cpasterplugin.cpp
index 4611e0696a..65b3d25179 100644
--- a/src/plugins/cpaster/cpasterplugin.cpp
+++ b/src/plugins/cpaster/cpasterplugin.cpp
@@ -116,14 +116,9 @@ CodePasterPlugin::~CodePasterPlugin()
     delete d;
 }
 
-bool CodePasterPlugin::initialize(const QStringList &arguments, QString *errorMessage)
+void CodePasterPlugin::initialize()
 {
-    Q_UNUSED(arguments)
-    Q_UNUSED(errorMessage)
-
     d = new CodePasterPluginPrivate;
-
-    return true;
 }
 
 CodePasterPluginPrivate::CodePasterPluginPrivate()
diff --git a/src/plugins/cpaster/cpasterplugin.h b/src/plugins/cpaster/cpasterplugin.h
index 8da5eba75b..0bff115fd2 100644
--- a/src/plugins/cpaster/cpasterplugin.h
+++ b/src/plugins/cpaster/cpasterplugin.h
@@ -43,7 +43,7 @@ public:
     ~CodePasterPlugin() final;
 
 private:
-    bool initialize(const QStringList &arguments, QString *errorMessage) final;
+    void initialize() final;
     ShutdownFlag aboutToShutdown() final;
 
     CodePasterPluginPrivate *d = nullptr;
diff --git a/src/plugins/cppcheck/cppcheckplugin.cpp b/src/plugins/cppcheck/cppcheckplugin.cpp
index 33afa6c43d..5dd09a1820 100644
--- a/src/plugins/cppcheck/cppcheckplugin.cpp
+++ b/src/plugins/cppcheck/cppcheckplugin.cpp
@@ -133,11 +133,8 @@ CppcheckPlugin::CppcheckPlugin() = default;
 
 CppcheckPlugin::~CppcheckPlugin() = default;
 
-bool CppcheckPlugin::initialize(const QStringList &arguments, QString *errorString)
+void CppcheckPlugin::initialize()
 {
-    Q_UNUSED(arguments)
-    Q_UNUSED(errorString)
-
     d.reset(new CppcheckPluginPrivate);
 
     using namespace Core;
@@ -156,8 +153,6 @@ bool CppcheckPlugin::initialize(const QStringList &arguments, QString *errorStri
     connect(ProjectExplorerPlugin::instance(), &ProjectExplorerPlugin::runActionsUpdated,
             d.get(), &CppcheckPluginPrivate::updateManualRunAction);
     d->updateManualRunAction();
-
-    return true;
 }
 
 } // Cppcheck::Internal
diff --git a/src/plugins/cppcheck/cppcheckplugin.h b/src/plugins/cppcheck/cppcheckplugin.h
index 697aea6030..d6911b5638 100644
--- a/src/plugins/cppcheck/cppcheckplugin.h
+++ b/src/plugins/cppcheck/cppcheckplugin.h
@@ -21,7 +21,7 @@ public:
     ~CppcheckPlugin() override;
 
 private:
-    bool initialize(const QStringList &arguments, QString *errorString) final;
+    void initialize() final;
 
     std::unique_ptr<CppcheckPluginPrivate> d;
 };
diff --git a/src/plugins/cppeditor/cppeditorplugin.cpp b/src/plugins/cppeditor/cppeditorplugin.cpp
index 3b82803a00..d596a1fe7e 100644
--- a/src/plugins/cppeditor/cppeditorplugin.cpp
+++ b/src/plugins/cppeditor/cppeditorplugin.cpp
@@ -224,10 +224,8 @@ CppQuickFixAssistProvider *CppEditorPlugin::quickFixProvider() const
     return &d->m_quickFixProvider;
 }
 
-bool CppEditorPlugin::initialize(const QStringList & /*arguments*/, QString *errorMessage)
+void CppEditorPlugin::initialize()
 {
-    Q_UNUSED(errorMessage)
-
     d = new CppEditorPluginPrivate;
     d->initialize();
 
@@ -465,8 +463,6 @@ bool CppEditorPlugin::initialize(const QStringList & /*arguments*/, QString *err
             d, &CppEditorPluginPrivate::onTaskStarted);
     connect(ProgressManager::instance(), &ProgressManager::allTasksFinished,
             d, &CppEditorPluginPrivate::onAllTasksFinished);
-
-    return true;
 }
 
 void CppEditorPlugin::extensionsInitialized()
diff --git a/src/plugins/cppeditor/cppeditorplugin.h b/src/plugins/cppeditor/cppeditorplugin.h
index 08d5f06af2..5ffdeaae54 100644
--- a/src/plugins/cppeditor/cppeditorplugin.h
+++ b/src/plugins/cppeditor/cppeditorplugin.h
@@ -53,7 +53,7 @@ signals:
     void includeHierarchyRequested();
 
 private:
-    bool initialize(const QStringList &arguments, QString *errorMessage) override;
+    void initialize() override;
     void extensionsInitialized() override;
     QVector<QObject *> createTestObjects() const override;
 
diff --git a/src/plugins/ctfvisualizer/ctfvisualizerplugin.cpp b/src/plugins/ctfvisualizer/ctfvisualizerplugin.cpp
index 123ee1720c..9c908536bb 100644
--- a/src/plugins/ctfvisualizer/ctfvisualizerplugin.cpp
+++ b/src/plugins/ctfvisualizer/ctfvisualizerplugin.cpp
@@ -1,5 +1,6 @@
 // Copyright (C) 2019 Klarälvdalens Datakonsult AB, a KDAB Group company,
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
 #include "ctfvisualizerplugin.h"
 
 #include "ctfvisualizertool.h"
@@ -18,13 +19,9 @@ CtfVisualizerPlugin::~CtfVisualizerPlugin()
     delete d;
 }
 
-bool CtfVisualizerPlugin::initialize(const QStringList &arguments, QString *errorString)
+void CtfVisualizerPlugin::initialize()
 {
-    Q_UNUSED(arguments)
-    Q_UNUSED(errorString)
-
     d = new CtfVisualizerPluginPrivate;
-    return true;
 }
 
 } // namespace Internal
diff --git a/src/plugins/ctfvisualizer/ctfvisualizerplugin.h b/src/plugins/ctfvisualizer/ctfvisualizerplugin.h
index acfb0a1273..4550606940 100644
--- a/src/plugins/ctfvisualizer/ctfvisualizerplugin.h
+++ b/src/plugins/ctfvisualizer/ctfvisualizerplugin.h
@@ -16,7 +16,7 @@ class CtfVisualizerPlugin : public ExtensionSystem::IPlugin
 public:
     ~CtfVisualizerPlugin();
 
-    bool initialize(const QStringList &arguments, QString *errorString) final;
+    void initialize() final;
 
     class CtfVisualizerPluginPrivate *d = nullptr;
 };
diff --git a/src/plugins/cvs/cvsplugin.cpp b/src/plugins/cvs/cvsplugin.cpp
index 10a2037253..1030b74cfa 100644
--- a/src/plugins/cvs/cvsplugin.cpp
+++ b/src/plugins/cvs/cvsplugin.cpp
@@ -480,12 +480,9 @@ CvsPlugin::~CvsPlugin()
     dd = nullptr;
 }
 
-bool CvsPlugin::initialize(const QStringList &arguments, QString *errorMessage)
+void CvsPlugin::initialize()
 {
-    Q_UNUSED(arguments)
-    Q_UNUSED(errorMessage)
     dd = new CvsPluginPrivate;
-    return true;
 }
 
 void CvsPlugin::extensionsInitialized()
diff --git a/src/plugins/cvs/cvsplugin.h b/src/plugins/cvs/cvsplugin.h
index 823b769f58..1826475ebb 100644
--- a/src/plugins/cvs/cvsplugin.h
+++ b/src/plugins/cvs/cvsplugin.h
@@ -14,7 +14,7 @@ class CvsPlugin final : public ExtensionSystem::IPlugin
 
     ~CvsPlugin() final;
 
-    bool initialize(const QStringList &arguments, QString *errorMessage) final;
+    void initialize() final;
     void extensionsInitialized() final;
 
 #ifdef WITH_TESTS
diff --git a/src/plugins/designer/formeditorplugin.cpp b/src/plugins/designer/formeditorplugin.cpp
index 132d56663b..50a5f4a8df 100644
--- a/src/plugins/designer/formeditorplugin.cpp
+++ b/src/plugins/designer/formeditorplugin.cpp
@@ -57,10 +57,8 @@ FormEditorPlugin::~FormEditorPlugin()
     delete d;
 }
 
-bool FormEditorPlugin::initialize(const QStringList &arguments, QString *error)
+void FormEditorPlugin::initialize()
 {
-    Q_UNUSED(arguments)
-
     d = new FormEditorPluginPrivate;
 
 #ifdef CPP_ENABLED
@@ -91,8 +89,6 @@ bool FormEditorPlugin::initialize(const QStringList &arguments, QString *error)
         if (qtr->load(trFile, qtTrPath) || qtr->load(trFile, creatorTrPath))
             QCoreApplication::installTranslator(qtr);
     }
-    error->clear();
-    return true;
 }
 
 void FormEditorPlugin::extensionsInitialized()
diff --git a/src/plugins/designer/formeditorplugin.h b/src/plugins/designer/formeditorplugin.h
index b1407be217..e24c76ec53 100644
--- a/src/plugins/designer/formeditorplugin.h
+++ b/src/plugins/designer/formeditorplugin.h
@@ -24,7 +24,7 @@ private slots:
 #endif
 
 private:
-    bool initialize(const QStringList &arguments, QString *errorMessage = nullptr) override;
+    void initialize() override;
     void extensionsInitialized() override;
 
     void switchSourceForm();
diff --git a/src/plugins/diffeditor/diffeditorplugin.cpp b/src/plugins/diffeditor/diffeditorplugin.cpp
index 44c824c3de..e18a0e2797 100644
--- a/src/plugins/diffeditor/diffeditorplugin.cpp
+++ b/src/plugins/diffeditor/diffeditorplugin.cpp
@@ -524,14 +524,9 @@ DiffEditorPlugin::~DiffEditorPlugin()
     s_instance = nullptr;
 }
 
-bool DiffEditorPlugin::initialize(const QStringList &arguments, QString *errorMessage)
+void DiffEditorPlugin::initialize()
 {
     d = new DiffEditorPluginPrivate;
-
-    Q_UNUSED(arguments)
-    Q_UNUSED(errorMessage)
-
-    return true;
 }
 
 FutureSynchronizer *DiffEditorPlugin::futureSynchronizer()
diff --git a/src/plugins/diffeditor/diffeditorplugin.h b/src/plugins/diffeditor/diffeditorplugin.h
index 9e70356f4d..66849a7387 100644
--- a/src/plugins/diffeditor/diffeditorplugin.h
+++ b/src/plugins/diffeditor/diffeditorplugin.h
@@ -32,7 +32,7 @@ public:
     DiffEditorPlugin();
     ~DiffEditorPlugin();
 
-    bool initialize(const QStringList &arguments, QString *errorMessage) final;
+    void initialize() final;
 
     static Utils::FutureSynchronizer *futureSynchronizer();
 
diff --git a/src/plugins/docker/dockerplugin.cpp b/src/plugins/docker/dockerplugin.cpp
index b04b2612ec..d7addc894d 100644
--- a/src/plugins/docker/dockerplugin.cpp
+++ b/src/plugins/docker/dockerplugin.cpp
@@ -53,14 +53,9 @@ DockerPlugin::~DockerPlugin()
     delete d;
 }
 
-bool DockerPlugin::initialize(const QStringList &arguments, QString *errorString)
+void DockerPlugin::initialize()
 {
-    Q_UNUSED(arguments)
-    Q_UNUSED(errorString)
-
     d = new DockerPluginPrivate;
-
-    return true;
 }
 
 } // Docker::Interanl
diff --git a/src/plugins/docker/dockerplugin.h b/src/plugins/docker/dockerplugin.h
index 6f2e6f3f66..c4ee04ac5a 100644
--- a/src/plugins/docker/dockerplugin.h
+++ b/src/plugins/docker/dockerplugin.h
@@ -24,7 +24,7 @@ public:
 private:
     ~DockerPlugin() final;
 
-    bool initialize(const QStringList &arguments, QString *errorString) final;
+    void initialize() final;
 
     class DockerPluginPrivate *d = nullptr;
 };
diff --git a/src/plugins/emacskeys/emacskeysplugin.cpp b/src/plugins/emacskeys/emacskeysplugin.cpp
index 11063de3d6..fbd5e3b4ef 100644
--- a/src/plugins/emacskeys/emacskeysplugin.cpp
+++ b/src/plugins/emacskeys/emacskeysplugin.cpp
@@ -69,11 +69,8 @@ EmacsKeysPlugin::EmacsKeysPlugin() = default;
 
 EmacsKeysPlugin::~EmacsKeysPlugin() = default;
 
-bool EmacsKeysPlugin::initialize(const QStringList &arguments, QString *errorString)
+void EmacsKeysPlugin::initialize()
 {
-    Q_UNUSED(arguments)
-    Q_UNUSED(errorString)
-
     // We have to use this hack here at the moment, because it's the only way to
     // disable Qt Creator menu accelerators aka mnemonics. Many of them get into
     // the way of typical emacs keys, such as: Alt+F (File), Alt+B (Build),
@@ -130,7 +127,6 @@ bool EmacsKeysPlugin::initialize(const QStringList &arguments, QString *errorStr
         &EmacsKeysPlugin::scrollHalfDown, tr("Scroll Half Screen Down"));
     registerAction(Constants::SCROLL_HALF_UP,
         &EmacsKeysPlugin::scrollHalfUp, tr("Scroll Half Screen Up"));
-    return true;
 }
 
 void EmacsKeysPlugin::extensionsInitialized()
diff --git a/src/plugins/emacskeys/emacskeysplugin.h b/src/plugins/emacskeys/emacskeysplugin.h
index dca1f3960c..b0acb078cc 100644
--- a/src/plugins/emacskeys/emacskeysplugin.h
+++ b/src/plugins/emacskeys/emacskeysplugin.h
@@ -55,7 +55,7 @@ public:
     EmacsKeysPlugin();
     ~EmacsKeysPlugin() override;
 
-    bool initialize(const QStringList &arguments, QString *errorString) override;
+    void initialize() override;
     void extensionsInitialized() override;
     ShutdownFlag aboutToShutdown() override;
 
diff --git a/src/plugins/fakevim/fakevimplugin.cpp b/src/plugins/fakevim/fakevimplugin.cpp
index fcc80e43c9..02207de872 100644
--- a/src/plugins/fakevim/fakevimplugin.cpp
+++ b/src/plugins/fakevim/fakevimplugin.cpp
@@ -499,7 +499,7 @@ class FakeVimPluginPrivate : public QObject
 public:
     FakeVimPluginPrivate();
 
-    bool initialize();
+    void initialize();
 
     void editorOpened(Core::IEditor *);
     void editorAboutToClose(Core::IEditor *);
@@ -1155,7 +1155,7 @@ FakeVimPluginPrivate::FakeVimPluginPrivate()
     }
 }
 
-bool FakeVimPluginPrivate::initialize()
+void FakeVimPluginPrivate::initialize()
 {
     runData = new FakeVimPluginRunData;
 /*
@@ -1230,8 +1230,6 @@ bool FakeVimPluginPrivate::initialize()
             this, &FakeVimPluginPrivate::handleDelayedQuitAll, Qt::QueuedConnection);
 
     setCursorBlinking(s.blinkingCursor.value());
-
-    return true;
 }
 
 void FakeVimPluginPrivate::userActionTriggered(int key)
@@ -2138,11 +2136,9 @@ FakeVimPlugin::~FakeVimPlugin()
     dd = nullptr;
 }
 
-bool FakeVimPlugin::initialize(const QStringList &arguments, QString *errorMessage)
+void FakeVimPlugin::initialize()
 {
-    Q_UNUSED(arguments)
-    Q_UNUSED(errorMessage)
-    return dd->initialize();
+    dd->initialize();
 }
 
 ExtensionSystem::IPlugin::ShutdownFlag FakeVimPlugin::aboutToShutdown()
diff --git a/src/plugins/fakevim/fakevimplugin.h b/src/plugins/fakevim/fakevimplugin.h
index e90bace161..c6a925ad2a 100644
--- a/src/plugins/fakevim/fakevimplugin.h
+++ b/src/plugins/fakevim/fakevimplugin.h
@@ -21,7 +21,7 @@ public:
 
 private:
     // implementation of ExtensionSystem::IPlugin
-    bool initialize(const QStringList &arguments, QString *errorMessage) override;
+    void initialize() override;
     ShutdownFlag aboutToShutdown() override;
     void extensionsInitialized() override;
 
diff --git a/src/plugins/genericprojectmanager/genericprojectplugin.cpp b/src/plugins/genericprojectmanager/genericprojectplugin.cpp
index cafdef4640..de49bd4d80 100644
--- a/src/plugins/genericprojectmanager/genericprojectplugin.cpp
+++ b/src/plugins/genericprojectmanager/genericprojectplugin.cpp
@@ -54,10 +54,9 @@ GenericProjectPlugin::~GenericProjectPlugin()
     delete d;
 }
 
-bool GenericProjectPlugin::initialize(const QStringList &, QString *)
+void GenericProjectPlugin::initialize()
 {
     d = new GenericProjectPluginPrivate;
-    return true;
 }
 
 GenericProjectPluginPrivate::GenericProjectPluginPrivate()
diff --git a/src/plugins/genericprojectmanager/genericprojectplugin.h b/src/plugins/genericprojectmanager/genericprojectplugin.h
index 58bcf48211..9fab0fcc1b 100644
--- a/src/plugins/genericprojectmanager/genericprojectplugin.h
+++ b/src/plugins/genericprojectmanager/genericprojectplugin.h
@@ -17,7 +17,7 @@ public:
     ~GenericProjectPlugin() override;
 
 private:
-    bool initialize(const QStringList &arguments, QString *errorString) override;
+    void initialize() override;
     void extensionsInitialized() override { }
 
     class GenericProjectPluginPrivate *d = nullptr;
diff --git a/src/plugins/gitlab/gitlabplugin.cpp b/src/plugins/gitlab/gitlabplugin.cpp
index a4ce353a9a..7994a95304 100644
--- a/src/plugins/gitlab/gitlabplugin.cpp
+++ b/src/plugins/gitlab/gitlabplugin.cpp
@@ -67,7 +67,7 @@ GitLabPlugin::~GitLabPlugin()
     dd = nullptr;
 }
 
-bool GitLabPlugin::initialize(const QStringList & /*arguments*/, QString * /*errorString*/)
+void GitLabPlugin::initialize()
 {
     dd = new GitLabPluginPrivate;
     dd->parameters.fromSettings(Core::ICore::settings());
@@ -91,7 +91,6 @@ bool GitLabPlugin::initialize(const QStringList & /*arguments*/, QString * /*err
     connect(ProjectExplorer::SessionManager::instance(),
             &ProjectExplorer::SessionManager::startupProjectChanged,
             this, &GitLabPlugin::onStartupProjectChanged);
-    return true;
 }
 
 void GitLabPlugin::openView()
diff --git a/src/plugins/gitlab/gitlabplugin.h b/src/plugins/gitlab/gitlabplugin.h
index e8e034e9d6..d49c17d89d 100644
--- a/src/plugins/gitlab/gitlabplugin.h
+++ b/src/plugins/gitlab/gitlabplugin.h
@@ -24,7 +24,7 @@ public:
     GitLabPlugin();
     ~GitLabPlugin() override;
 
-    bool initialize(const QStringList &arguments, QString *errorString) override;
+    void initialize() override;
 
     static QList<GitLabServer> allGitLabServers();
     static GitLabServer gitLabServerForId(const Utils::Id &id);
diff --git a/src/plugins/glsleditor/glsleditorplugin.cpp b/src/plugins/glsleditor/glsleditorplugin.cpp
index a0b4e2ad7b..eff9456527 100644
--- a/src/plugins/glsleditor/glsleditorplugin.cpp
+++ b/src/plugins/glsleditor/glsleditorplugin.cpp
@@ -92,7 +92,7 @@ GlslEditorPlugin::~GlslEditorPlugin()
     dd = nullptr;
 }
 
-bool GlslEditorPlugin::initialize(const QStringList &, QString *)
+void GlslEditorPlugin::initialize()
 {
     dd = new GlslEditorPluginPrivate;
 
@@ -111,8 +111,6 @@ bool GlslEditorPlugin::initialize(const QStringList &, QString *)
 
     Command *cmd = ActionManager::command(TextEditor::Constants::UN_COMMENT_SELECTION);
     contextMenu->addAction(cmd);
-
-    return true;
 }
 
 void GlslEditorPlugin::extensionsInitialized()
diff --git a/src/plugins/glsleditor/glsleditorplugin.h b/src/plugins/glsleditor/glsleditorplugin.h
index ed3800f5af..3d6b9f2338 100644
--- a/src/plugins/glsleditor/glsleditorplugin.h
+++ b/src/plugins/glsleditor/glsleditorplugin.h
@@ -40,7 +40,7 @@ public:
     static const InitFile *shaderInit(int variant);
 
 private:
-    bool initialize(const QStringList &arguments, QString *errorMessage) final;
+    void initialize() final;
     void extensionsInitialized() final;
 };
 
diff --git a/src/plugins/help/helpplugin.cpp b/src/plugins/help/helpplugin.cpp
index 9a0e23eeba..5612637247 100644
--- a/src/plugins/help/helpplugin.cpp
+++ b/src/plugins/help/helpplugin.cpp
@@ -158,12 +158,9 @@ void HelpPlugin::showHelpUrl(const QUrl &url, Core::HelpManager::HelpViewerLocat
     dd->showHelpUrl(url, location);
 }
 
-bool HelpPlugin::initialize(const QStringList &arguments, QString *error)
+void HelpPlugin::initialize()
 {
-    Q_UNUSED(arguments)
-    Q_UNUSED(error)
     dd = new HelpPluginPrivate;
-    return true;
 }
 
 HelpPluginPrivate::HelpPluginPrivate()
diff --git a/src/plugins/help/helpplugin.h b/src/plugins/help/helpplugin.h
index 8be957b3a8..d3a3e0b980 100644
--- a/src/plugins/help/helpplugin.h
+++ b/src/plugins/help/helpplugin.h
@@ -30,7 +30,7 @@ public:
     static HelpWidget *modeHelpWidget();
 
 private:
-    bool initialize(const QStringList &arguments, QString *errorMessage) final;
+    void initialize() final;
     void extensionsInitialized() final;
     bool delayedInitialize() final;
     ShutdownFlag aboutToShutdown() final;
diff --git a/src/plugins/imageviewer/imageviewerplugin.cpp b/src/plugins/imageviewer/imageviewerplugin.cpp
index 4e11020524..9805c4ef3d 100644
--- a/src/plugins/imageviewer/imageviewerplugin.cpp
+++ b/src/plugins/imageviewer/imageviewerplugin.cpp
@@ -114,14 +114,9 @@ ImageViewerPlugin::~ImageViewerPlugin()
     delete  d;
 }
 
-bool ImageViewerPlugin::initialize(const QStringList &arguments, QString *errorMessage)
+void ImageViewerPlugin::initialize()
 {
-    Q_UNUSED(arguments)
-    Q_UNUSED(errorMessage)
-
     d = new ImageViewerPluginPrivate;
-
-    return true;
 }
 
 } // ImageViewer::Internal
diff --git a/src/plugins/imageviewer/imageviewerplugin.h b/src/plugins/imageviewer/imageviewerplugin.h
index fc62b87c4b..bb2253c6a3 100644
--- a/src/plugins/imageviewer/imageviewerplugin.h
+++ b/src/plugins/imageviewer/imageviewerplugin.h
@@ -18,7 +18,7 @@ public:
     ~ImageViewerPlugin();
 
 private:
-    bool initialize(const QStringList &arguments, QString *errorMessage) final;
+    void initialize() final;
 
     class ImageViewerPluginPrivate *d = nullptr;
 };
diff --git a/src/plugins/incredibuild/incredibuildplugin.cpp b/src/plugins/incredibuild/incredibuildplugin.cpp
index a54254ddd2..6e7ea8a4bc 100644
--- a/src/plugins/incredibuild/incredibuildplugin.cpp
+++ b/src/plugins/incredibuild/incredibuildplugin.cpp
@@ -20,14 +20,9 @@ IncrediBuildPlugin::~IncrediBuildPlugin()
     delete d;
 }
 
-bool IncrediBuildPlugin::initialize(const QStringList &arguments, QString *errorString)
+void IncrediBuildPlugin::initialize()
 {
-    Q_UNUSED(arguments)
-    Q_UNUSED(errorString)
-
     d = new IncrediBuildPluginPrivate;
-
-    return true;
 }
 
 } // IncrediBuild::Internal
diff --git a/src/plugins/incredibuild/incredibuildplugin.h b/src/plugins/incredibuild/incredibuildplugin.h
index 0ef93934a7..994d65bb77 100644
--- a/src/plugins/incredibuild/incredibuildplugin.h
+++ b/src/plugins/incredibuild/incredibuildplugin.h
@@ -16,7 +16,7 @@ public:
     IncrediBuildPlugin() = default;
     ~IncrediBuildPlugin() final;
 
-    bool initialize(const QStringList &arguments, QString *errorString) final;
+    void initialize() final;
 
 private:
     class IncrediBuildPluginPrivate *d = nullptr;
diff --git a/src/plugins/ios/iosplugin.cpp b/src/plugins/ios/iosplugin.cpp
index b343fc3996..9f790aa17f 100644
--- a/src/plugins/ios/iosplugin.cpp
+++ b/src/plugins/ios/iosplugin.cpp
@@ -67,18 +67,13 @@ IosPlugin::~IosPlugin()
     delete d;
 }
 
-bool IosPlugin::initialize(const QStringList &arguments, QString *errorMessage)
+void IosPlugin::initialize()
 {
-    Q_UNUSED(arguments)
-    Q_UNUSED(errorMessage)
-
     qRegisterMetaType<Ios::IosToolHandler::Dict>("Ios::IosToolHandler::Dict");
 
     IosConfigurations::initialize();
 
     d = new IosPluginPrivate;
-
-    return true;
 }
 
 } // Internal::Ios
diff --git a/src/plugins/ios/iosplugin.h b/src/plugins/ios/iosplugin.h
index 0e06fc198a..31deffd7d2 100644
--- a/src/plugins/ios/iosplugin.h
+++ b/src/plugins/ios/iosplugin.h
@@ -17,7 +17,7 @@ public:
     ~IosPlugin() final;
 
 private:
-    bool initialize(const QStringList &arguments, QString *errorMessage) final;
+    void initialize() final;
 
     class IosPluginPrivate *d = nullptr;
 };
diff --git a/src/plugins/languageclient/languageclientplugin.cpp b/src/plugins/languageclient/languageclientplugin.cpp
index c44c81fdf4..7332f03e2b 100644
--- a/src/plugins/languageclient/languageclientplugin.cpp
+++ b/src/plugins/languageclient/languageclientplugin.cpp
@@ -33,7 +33,7 @@ LanguageClientPlugin *LanguageClientPlugin::instance()
     return m_instance;
 }
 
-bool LanguageClientPlugin::initialize(const QStringList & /*arguments*/, QString * /*errorString*/)
+void LanguageClientPlugin::initialize()
 {
     using namespace Core;
 
@@ -50,8 +50,6 @@ bool LanguageClientPlugin::initialize(const QStringList & /*arguments*/, QString
     connect(inspectAction, &QAction::triggered, this, &LanguageClientManager::showInspector);
     toolsDebugContainer->addAction(
         ActionManager::registerAction(inspectAction, "LanguageClient.InspectLanguageClients"));
-
-    return true;
 }
 
 void LanguageClientPlugin::extensionsInitialized()
diff --git a/src/plugins/languageclient/languageclientplugin.h b/src/plugins/languageclient/languageclientplugin.h
index 5bdbfc0a0a..b8eb3ac00a 100644
--- a/src/plugins/languageclient/languageclientplugin.h
+++ b/src/plugins/languageclient/languageclientplugin.h
@@ -22,7 +22,7 @@ public:
 
     // IPlugin interface
 private:
-    bool initialize(const QStringList &arguments, QString *errorString) override;
+    void initialize() override;
     void extensionsInitialized() override;
     ShutdownFlag aboutToShutdown() override;
 
diff --git a/src/plugins/macros/macrosplugin.cpp b/src/plugins/macros/macrosplugin.cpp
index b3a3bb750a..be4d2d2217 100644
--- a/src/plugins/macros/macrosplugin.cpp
+++ b/src/plugins/macros/macrosplugin.cpp
@@ -38,11 +38,8 @@ MacrosPlugin::~MacrosPlugin()
     delete d;
 }
 
-bool MacrosPlugin::initialize(const QStringList &arguments, QString *errorMessage)
+void MacrosPlugin::initialize()
 {
-    Q_UNUSED(arguments)
-    Q_UNUSED(errorMessage)
-
     d = new MacrosPluginPrivate;
 
     Core::Context textContext(TextEditor::Constants::C_TEXTEDITOR);
@@ -79,10 +76,7 @@ bool MacrosPlugin::initialize(const QStringList &arguments, QString *errorMessag
     command = Core::ActionManager::registerAction(saveLastMacro, Constants::SAVE_LAST_MACRO, textContext);
     mmacrotools->addAction(command);
     connect(saveLastMacro, &QAction::triggered, &d->macroManager, &MacroManager::saveLastMacro);
-
-    return true;
 }
 
-
 } // Internal
 } // Macros
diff --git a/src/plugins/macros/macrosplugin.h b/src/plugins/macros/macrosplugin.h
index 8184d7485a..da7daf3ec6 100644
--- a/src/plugins/macros/macrosplugin.h
+++ b/src/plugins/macros/macrosplugin.h
@@ -16,7 +16,7 @@ class MacrosPlugin final : public ExtensionSystem::IPlugin
 public:
     ~MacrosPlugin() final;
 
-    bool initialize(const QStringList &arguments, QString *errorMessage) final;
+    void initialize() final;
 
 private:
     class MacrosPluginPrivate *d = nullptr;
diff --git a/src/plugins/mcusupport/mcusupportplugin.cpp b/src/plugins/mcusupport/mcusupportplugin.cpp
index 095100bb8a..608588aa9d 100644
--- a/src/plugins/mcusupport/mcusupportplugin.cpp
+++ b/src/plugins/mcusupport/mcusupportplugin.cpp
@@ -68,19 +68,14 @@ McuSupportPlugin::~McuSupportPlugin()
     dd = nullptr;
 }
 
-bool McuSupportPlugin::initialize(const QStringList &arguments, QString *errorString)
+void McuSupportPlugin::initialize()
 {
-    Q_UNUSED(arguments)
-    Q_UNUSED(errorString)
-
     setObjectName("McuSupportPlugin");
     dd = new McuSupportPluginPrivate;
 
     dd->m_options.registerQchFiles();
     dd->m_options.registerExamples();
     ProjectExplorer::JsonWizardFactory::addWizardPath(":/mcusupport/wizards/");
-
-    return true;
 }
 
 void McuSupportPlugin::extensionsInitialized()
diff --git a/src/plugins/mcusupport/mcusupportplugin.h b/src/plugins/mcusupport/mcusupportplugin.h
index 9c56ca41e6..6db14cb63e 100644
--- a/src/plugins/mcusupport/mcusupportplugin.h
+++ b/src/plugins/mcusupport/mcusupportplugin.h
@@ -19,7 +19,7 @@ class McuSupportPlugin final : public ExtensionSystem::IPlugin
 public:
     ~McuSupportPlugin() final;
 
-    bool initialize(const QStringList &arguments, QString *errorString) final;
+    void initialize() final;
     void extensionsInitialized() final;
 
     void askUserAboutMcuSupportKitsSetup();
diff --git a/src/plugins/mercurial/mercurialplugin.cpp b/src/plugins/mercurial/mercurialplugin.cpp
index 5eb45e3ea4..e84c26a6ca 100644
--- a/src/plugins/mercurial/mercurialplugin.cpp
+++ b/src/plugins/mercurial/mercurialplugin.cpp
@@ -226,10 +226,9 @@ MercurialPlugin::~MercurialPlugin()
     dd = nullptr;
 }
 
-bool MercurialPlugin::initialize(const QStringList & /* arguments */, QString * /*errorMessage */)
+void MercurialPlugin::initialize()
 {
     dd = new MercurialPluginPrivate;
-    return true;
 }
 
 void MercurialPlugin::extensionsInitialized()
diff --git a/src/plugins/mercurial/mercurialplugin.h b/src/plugins/mercurial/mercurialplugin.h
index f4cf0d71b4..a5b789452b 100644
--- a/src/plugins/mercurial/mercurialplugin.h
+++ b/src/plugins/mercurial/mercurialplugin.h
@@ -14,7 +14,7 @@ class MercurialPlugin final : public ExtensionSystem::IPlugin
 
     ~MercurialPlugin() final;
 
-    bool initialize(const QStringList &arguments, QString *errorMessage) final;
+    void initialize() final;
     void extensionsInitialized() final;
 
 #ifdef WITH_TESTS
diff --git a/src/plugins/mesonprojectmanager/mesonprojectplugin.cpp b/src/plugins/mesonprojectmanager/mesonprojectplugin.cpp
index adabb646ee..f15f65c4af 100644
--- a/src/plugins/mesonprojectmanager/mesonprojectplugin.cpp
+++ b/src/plugins/mesonprojectmanager/mesonprojectplugin.cpp
@@ -69,17 +69,14 @@ MesonProjectPlugin::~MesonProjectPlugin()
     delete d;
 }
 
-bool MesonProjectPlugin::initialize(const QStringList & /*arguments*/, QString *errorMessage)
+void MesonProjectPlugin::initialize()
 {
-    Q_UNUSED(errorMessage)
-
     d = new MesonProjectPluginPrivate;
 
     ProjectManager::registerProjectType<MesonProject>(Constants::Project::MIMETYPE);
     FileIconProvider::registerIconOverlayForFilename(Constants::Icons::MESON, "meson.build");
     FileIconProvider::registerIconOverlayForFilename(Constants::Icons::MESON, "meson_options.txt");
     Settings::instance()->readSettings(ICore::settings());
-    return true;
 }
 
 } // MesonProjectManager::Internal
diff --git a/src/plugins/mesonprojectmanager/mesonprojectplugin.h b/src/plugins/mesonprojectmanager/mesonprojectplugin.h
index b6d8936c39..6cae4586dc 100644
--- a/src/plugins/mesonprojectmanager/mesonprojectplugin.h
+++ b/src/plugins/mesonprojectmanager/mesonprojectplugin.h
@@ -17,7 +17,7 @@ public:
     ~MesonProjectPlugin() final;
 
 private:
-    bool initialize(const QStringList &arguments, QString *errorMessage) final;
+    void initialize() final;
 
     class MesonProjectPluginPrivate *d = nullptr;
 };
diff --git a/src/plugins/modeleditor/modeleditor_plugin.cpp b/src/plugins/modeleditor/modeleditor_plugin.cpp
index 28671e3738..4cdbf85a74 100644
--- a/src/plugins/modeleditor/modeleditor_plugin.cpp
+++ b/src/plugins/modeleditor/modeleditor_plugin.cpp
@@ -58,10 +58,8 @@ ModelEditorPlugin::~ModelEditorPlugin()
     delete d;
 }
 
-bool ModelEditorPlugin::initialize(const QStringList &arguments, QString *errorString)
+void ModelEditorPlugin::initialize()
 {
-    Q_UNUSED(arguments)
-    Q_UNUSED(errorString)
     d = new ModelEditorPluginPrivate;
 
     Core::JsExpander::registerGlobalObject<JsExtension>("Modeling");
@@ -70,8 +68,6 @@ bool ModelEditorPlugin::initialize(const QStringList &arguments, QString *errorS
             &d->uiController, &UiController::saveSettings);
     connect(&d->settingsController, &SettingsController::loadSettings,
             &d->uiController, &UiController::loadSettings);
-
-    return true;
 }
 
 void ModelEditorPlugin::extensionsInitialized()
diff --git a/src/plugins/modeleditor/modeleditor_plugin.h b/src/plugins/modeleditor/modeleditor_plugin.h
index 04a0c7edba..d3cf0ceea9 100644
--- a/src/plugins/modeleditor/modeleditor_plugin.h
+++ b/src/plugins/modeleditor/modeleditor_plugin.h
@@ -19,7 +19,7 @@ public:
     ModelEditorPlugin();
     ~ModelEditorPlugin();
 
-    bool initialize(const QStringList &arguments, QString *errorString) override;
+    void initialize() override;
     void extensionsInitialized() override;
     ShutdownFlag aboutToShutdown() override;
 
diff --git a/src/plugins/perforce/perforceplugin.cpp b/src/plugins/perforce/perforceplugin.cpp
index cdcaccdba3..636fed7560 100644
--- a/src/plugins/perforce/perforceplugin.cpp
+++ b/src/plugins/perforce/perforceplugin.cpp
@@ -1690,11 +1690,9 @@ PerforcePlugin::~PerforcePlugin()
     dd = nullptr;
 }
 
-bool PerforcePlugin::initialize(const QStringList & /* arguments */, QString *errorMessage)
+void PerforcePlugin::initialize()
 {
-    Q_UNUSED(errorMessage)
     dd = new PerforcePluginPrivate;
-    return true;
 }
 
 #ifdef WITH_TESTS
diff --git a/src/plugins/perforce/perforceplugin.h b/src/plugins/perforce/perforceplugin.h
index 7dafbc7c93..4c511767cf 100644
--- a/src/plugins/perforce/perforceplugin.h
+++ b/src/plugins/perforce/perforceplugin.h
@@ -14,7 +14,7 @@ class PerforcePlugin final : public ExtensionSystem::IPlugin
 
     ~PerforcePlugin() final;
 
-    bool initialize(const QStringList &arguments, QString *errorMessage) final;
+    void initialize() final;
     void extensionsInitialized() final;
 
 public:
diff --git a/src/plugins/perfprofiler/perfprofilerplugin.cpp b/src/plugins/perfprofiler/perfprofilerplugin.cpp
index 2ae15e413d..12c006b48d 100644
--- a/src/plugins/perfprofiler/perfprofilerplugin.cpp
+++ b/src/plugins/perfprofiler/perfprofilerplugin.cpp
@@ -55,13 +55,9 @@ PerfProfilerPlugin::~PerfProfilerPlugin()
     delete d;
 }
 
-bool PerfProfilerPlugin::initialize(const QStringList &arguments, QString *errorString)
+void PerfProfilerPlugin::initialize()
 {
-    Q_UNUSED(arguments)
-    Q_UNUSED(errorString)
-
     d = new PerfProfilerPluginPrivate;
-    return true;
 }
 
 PerfSettings *PerfProfilerPlugin::globalSettings()
diff --git a/src/plugins/perfprofiler/perfprofilerplugin.h b/src/plugins/perfprofiler/perfprofilerplugin.h
index f3c4cb664b..d65281189d 100644
--- a/src/plugins/perfprofiler/perfprofilerplugin.h
+++ b/src/plugins/perfprofiler/perfprofilerplugin.h
@@ -17,7 +17,7 @@ class PerfProfilerPlugin : public ExtensionSystem::IPlugin
 public:
     ~PerfProfilerPlugin();
 
-    bool initialize(const QStringList &arguments, QString *errorString) final;
+    void initialize() final;
     QVector<QObject *> createTestObjects() const final;
 
     static PerfSettings *globalSettings();
diff --git a/src/plugins/python/pythonplugin.cpp b/src/plugins/python/pythonplugin.cpp
index 246494455d..dff3c0cb22 100644
--- a/src/plugins/python/pythonplugin.cpp
+++ b/src/plugins/python/pythonplugin.cpp
@@ -52,16 +52,11 @@ PythonPlugin *PythonPlugin::instance()
     return m_instance;
 }
 
-bool PythonPlugin::initialize(const QStringList &arguments, QString *errorMessage)
+void PythonPlugin::initialize()
 {
-    Q_UNUSED(arguments)
-    Q_UNUSED(errorMessage)
-
     d = new PythonPluginPrivate;
 
     ProjectManager::registerProjectType<PythonProject>(PythonMimeType);
-
-    return true;
 }
 
 void PythonPlugin::extensionsInitialized()
diff --git a/src/plugins/python/pythonplugin.h b/src/plugins/python/pythonplugin.h
index 1fb4e79d3c..ef0860bbca 100644
--- a/src/plugins/python/pythonplugin.h
+++ b/src/plugins/python/pythonplugin.h
@@ -19,7 +19,7 @@ public:
     static PythonPlugin *instance();
 
 private:
-    bool initialize(const QStringList &arguments, QString *errorMessage) final;
+    void initialize() final;
     void extensionsInitialized() final;
 
     class PythonPluginPrivate *d = nullptr;
diff --git a/src/plugins/qbsprojectmanager/qbsprojectmanagerplugin.cpp b/src/plugins/qbsprojectmanager/qbsprojectmanagerplugin.cpp
index 49af654e4f..01a58753a2 100644
--- a/src/plugins/qbsprojectmanager/qbsprojectmanagerplugin.cpp
+++ b/src/plugins/qbsprojectmanager/qbsprojectmanagerplugin.cpp
@@ -81,11 +81,8 @@ QbsProjectManagerPlugin::~QbsProjectManagerPlugin()
     delete d;
 }
 
-bool QbsProjectManagerPlugin::initialize(const QStringList &arguments, QString *errorMessage)
+void QbsProjectManagerPlugin::initialize()
 {
-    Q_UNUSED(arguments)
-    Q_UNUSED(errorMessage)
-
     d = new QbsProjectManagerPluginPrivate;
 
     const Core::Context projectContext(::QbsProjectManager::Constants::PROJECT_ID);
@@ -248,8 +245,6 @@ bool QbsProjectManagerPlugin::initialize(const QStringList &arguments, QString *
     updateContextActions(ProjectTree::currentNode());
     updateReparseQbsAction();
     updateBuildActions();
-
-    return true;
 }
 
 void QbsProjectManagerPlugin::targetWasAdded(Target *target)
diff --git a/src/plugins/qbsprojectmanager/qbsprojectmanagerplugin.h b/src/plugins/qbsprojectmanager/qbsprojectmanagerplugin.h
index 6b6e6f54be..bfda1ff3e9 100644
--- a/src/plugins/qbsprojectmanager/qbsprojectmanagerplugin.h
+++ b/src/plugins/qbsprojectmanager/qbsprojectmanagerplugin.h
@@ -29,7 +29,7 @@ public:
 private:
     ~QbsProjectManagerPlugin() final;
 
-    bool initialize(const QStringList &arguments, QString *errorMessage) final;
+    void initialize() final;
 
     void targetWasAdded(ProjectExplorer::Target *target);
     void projectChanged(QbsProject *project);
diff --git a/src/plugins/qmakeprojectmanager/qmakeprojectmanagerplugin.cpp b/src/plugins/qmakeprojectmanager/qmakeprojectmanagerplugin.cpp
index ef7a065ce9..c36f643570 100644
--- a/src/plugins/qmakeprojectmanager/qmakeprojectmanagerplugin.cpp
+++ b/src/plugins/qmakeprojectmanager/qmakeprojectmanagerplugin.cpp
@@ -128,10 +128,8 @@ QmakeProjectManagerPlugin::~QmakeProjectManagerPlugin()
     delete d;
 }
 
-bool QmakeProjectManagerPlugin::initialize(const QStringList &arguments, QString *errorMessage)
+void QmakeProjectManagerPlugin::initialize()
 {
-    Q_UNUSED(arguments)
-    Q_UNUSED(errorMessage)
     const Context projectContext(QmakeProjectManager::Constants::QMAKEPROJECT_ID);
     Context projectTreeContext(ProjectExplorer::Constants::C_PROJECT_TREE);
 
@@ -291,8 +289,6 @@ bool QmakeProjectManagerPlugin::initialize(const QStringList &arguments, QString
             d, &QmakeProjectManagerPluginPrivate::updateBuildFileAction);
 
     d->updateActions();
-
-    return true;
 }
 
 QmakeProjectManagerPluginPrivate::~QmakeProjectManagerPluginPrivate()
diff --git a/src/plugins/qmakeprojectmanager/qmakeprojectmanagerplugin.h b/src/plugins/qmakeprojectmanager/qmakeprojectmanagerplugin.h
index 70ab880aa4..0e9b5db2f3 100644
--- a/src/plugins/qmakeprojectmanager/qmakeprojectmanagerplugin.h
+++ b/src/plugins/qmakeprojectmanager/qmakeprojectmanagerplugin.h
@@ -25,7 +25,7 @@ private slots:
 #endif
 
 private:
-    bool initialize(const QStringList &arguments, QString *errorMessage) final;
+    void initialize() final;
 
     class QmakeProjectManagerPluginPrivate *d = nullptr;
 };
diff --git a/src/plugins/qmljseditor/qmljseditorplugin.cpp b/src/plugins/qmljseditor/qmljseditorplugin.cpp
index 4b0475da97..84f303ec18 100644
--- a/src/plugins/qmljseditor/qmljseditorplugin.cpp
+++ b/src/plugins/qmljseditor/qmljseditorplugin.cpp
@@ -101,14 +101,9 @@ QmlJSEditorPlugin::~QmlJSEditorPlugin()
     m_instance = nullptr;
 }
 
-bool QmlJSEditorPlugin::initialize(const QStringList &arguments, QString *errorMessage)
+void QmlJSEditorPlugin::initialize()
 {
-    Q_UNUSED(arguments)
-    Q_UNUSED(errorMessage)
-
     d = new QmlJSEditorPluginPrivate;
-
-    return true;
 }
 
 QmlJSEditorPluginPrivate::QmlJSEditorPluginPrivate()
diff --git a/src/plugins/qmljseditor/qmljseditorplugin.h b/src/plugins/qmljseditor/qmljseditorplugin.h
index 158f49cdab..cc1b63fe68 100644
--- a/src/plugins/qmljseditor/qmljseditorplugin.h
+++ b/src/plugins/qmljseditor/qmljseditorplugin.h
@@ -27,7 +27,7 @@ public:
     static QuickToolBar *quickToolBar();
 
 private:
-    bool initialize(const QStringList &arguments, QString *errorMessage) final;
+    void initialize() final;
     void extensionsInitialized() final;
     ShutdownFlag aboutToShutdown() final;
 
diff --git a/src/plugins/qmljstools/qmljstoolsplugin.cpp b/src/plugins/qmljstools/qmljstoolsplugin.cpp
index 1fe3e21d97..574c73190b 100644
--- a/src/plugins/qmljstools/qmljstoolsplugin.cpp
+++ b/src/plugins/qmljstools/qmljstoolsplugin.cpp
@@ -48,14 +48,9 @@ QmlJSToolsPlugin::~QmlJSToolsPlugin()
     delete d;
 }
 
-bool QmlJSToolsPlugin::initialize(const QStringList &arguments, QString *error)
+void QmlJSToolsPlugin::initialize()
 {
-    Q_UNUSED(arguments)
-    Q_UNUSED(error)
-
     d = new QmlJSToolsPluginPrivate;
-
-    return true;
 }
 
 QmlJSToolsPluginPrivate::QmlJSToolsPluginPrivate()
diff --git a/src/plugins/qmljstools/qmljstoolsplugin.h b/src/plugins/qmljstools/qmljstoolsplugin.h
index a67ccf6a33..b659a3462d 100644
--- a/src/plugins/qmljstools/qmljstoolsplugin.h
+++ b/src/plugins/qmljstools/qmljstoolsplugin.h
@@ -17,7 +17,7 @@ public:
     ~QmlJSToolsPlugin() final;
 
 private:
-    bool initialize(const QStringList &arguments, QString *errorMessage) final;
+    void initialize() final;
     void extensionsInitialized() final;
 
     class QmlJSToolsPluginPrivate *d = nullptr;
diff --git a/src/plugins/qmlpreview/qmlpreviewplugin.cpp b/src/plugins/qmlpreview/qmlpreviewplugin.cpp
index b1c10b6ead..194d9bcc6a 100644
--- a/src/plugins/qmlpreview/qmlpreviewplugin.cpp
+++ b/src/plugins/qmlpreview/qmlpreviewplugin.cpp
@@ -198,14 +198,9 @@ QmlPreviewPlugin::~QmlPreviewPlugin()
     delete d;
 }
 
-bool QmlPreviewPlugin::initialize(const QStringList &arguments, QString *errorString)
+void QmlPreviewPlugin::initialize()
 {
-    Q_UNUSED(arguments)
-    Q_UNUSED(errorString)
-
     d = new QmlPreviewPluginPrivate(this);
-
-    return true;
 }
 
 ExtensionSystem::IPlugin::ShutdownFlag QmlPreviewPlugin::aboutToShutdown()
diff --git a/src/plugins/qmlpreview/qmlpreviewplugin.h b/src/plugins/qmlpreview/qmlpreviewplugin.h
index 4ae3840f87..8e750146ab 100644
--- a/src/plugins/qmlpreview/qmlpreviewplugin.h
+++ b/src/plugins/qmlpreview/qmlpreviewplugin.h
@@ -48,7 +48,7 @@ class QMLPREVIEW_EXPORT QmlPreviewPlugin : public ExtensionSystem::IPlugin
 public:
     ~QmlPreviewPlugin() override;
 
-    bool initialize(const QStringList &arguments, QString *errorString) override;
+    void initialize() override;
     ShutdownFlag aboutToShutdown() override;
     QVector<QObject *> createTestObjects() const override;
 
diff --git a/src/plugins/qmlprojectmanager/qmlprojectplugin.cpp b/src/plugins/qmlprojectmanager/qmlprojectplugin.cpp
index fc3877ed71..3c156311b4 100644
--- a/src/plugins/qmlprojectmanager/qmlprojectplugin.cpp
+++ b/src/plugins/qmlprojectmanager/qmlprojectplugin.cpp
@@ -237,10 +237,8 @@ static QmlBuildSystem *qmlBuildSystemforFileNode(const FileNode *fileNode)
     return nullptr;
 }
 
-bool QmlProjectPlugin::initialize(const QStringList &, QString *errorMessage)
+void QmlProjectPlugin::initialize()
 {
-    Q_UNUSED(errorMessage)
-
     d = new QmlProjectPluginPrivate;
 
     if (!qmlDesignerEnabled()) {
@@ -358,8 +356,6 @@ bool QmlProjectPlugin::initialize(const QStringList &, QString *errorMessage)
     GenerateCmake::generateMenuEntry(this);
     if (QmlProject::isQtDesignStudio())
         GenerateCmake::CmakeProjectConverter::generateMenuEntry(this);
-
-    return true;
 }
 
 void QmlProjectPlugin::displayQmlLandingPage()
diff --git a/src/plugins/qmlprojectmanager/qmlprojectplugin.h b/src/plugins/qmlprojectmanager/qmlprojectplugin.h
index 15e2f690a1..75e85d619a 100644
--- a/src/plugins/qmlprojectmanager/qmlprojectplugin.h
+++ b/src/plugins/qmlprojectmanager/qmlprojectplugin.h
@@ -36,7 +36,7 @@ public slots:
     void openQds(bool permanent = false);
 
 private:
-    bool initialize(const QStringList &arguments, QString *errorString) final;
+    void initialize() final;
     void displayQmlLandingPage();
     void hideQmlLandingPage();
     void updateQmlLandingPageProjectInfo(const Utils::FilePath &projectFile);
diff --git a/src/plugins/qnx/qnxplugin.cpp b/src/plugins/qnx/qnxplugin.cpp
index 590ff64d75..5b5f889032 100644
--- a/src/plugins/qnx/qnxplugin.cpp
+++ b/src/plugins/qnx/qnxplugin.cpp
@@ -114,14 +114,9 @@ QnxPlugin::~QnxPlugin()
     delete dd;
 }
 
-bool QnxPlugin::initialize(const QStringList &arguments, QString *errorString)
+void QnxPlugin::initialize()
 {
-    Q_UNUSED(arguments)
-    Q_UNUSED(errorString)
-
     dd = new QnxPluginPrivate;
-
-    return true;
 }
 
 void QnxPlugin::extensionsInitialized()
diff --git a/src/plugins/qnx/qnxplugin.h b/src/plugins/qnx/qnxplugin.h
index 1136eeb767..2eed97319f 100644
--- a/src/plugins/qnx/qnxplugin.h
+++ b/src/plugins/qnx/qnxplugin.h
@@ -16,7 +16,7 @@ public:
     ~QnxPlugin() final;
 
 private:
-    bool initialize(const QStringList &arguments, QString *errorString) final;
+    void initialize() final;
     void extensionsInitialized() final;
 };
 
diff --git a/src/plugins/qtsupport/qtsupportplugin.cpp b/src/plugins/qtsupport/qtsupportplugin.cpp
index 839245c666..8945ca5afb 100644
--- a/src/plugins/qtsupport/qtsupportplugin.cpp
+++ b/src/plugins/qtsupport/qtsupportplugin.cpp
@@ -86,12 +86,10 @@ static void processRunnerCallback(ProcessData *data)
     data->stdOut = proc.readAllRawStandardOutput();
 }
 
-bool QtSupportPlugin::initialize(const QStringList &arguments, QString *errorMessage)
+void QtSupportPlugin::initialize()
 {
     theProcessRunner() = processRunnerCallback;
 
-    Q_UNUSED(arguments)
-    Q_UNUSED(errorMessage)
     QMakeParser::initialize();
     ProFileEvaluator::initialize();
     new ProFileCacheManager(this);
@@ -103,8 +101,6 @@ bool QtSupportPlugin::initialize(const QStringList &arguments, QString *errorMes
     d = new QtSupportPluginPrivate;
 
     QtVersionManager::initialized();
-
-    return true;
 }
 
 const char kLinkWithQtInstallationSetting[] = "LinkWithQtInstallation";
diff --git a/src/plugins/qtsupport/qtsupportplugin.h b/src/plugins/qtsupport/qtsupportplugin.h
index 7cd9a8eb79..7e4c98a9aa 100644
--- a/src/plugins/qtsupport/qtsupportplugin.h
+++ b/src/plugins/qtsupport/qtsupportplugin.h
@@ -17,7 +17,7 @@ public:
     ~QtSupportPlugin() final;
 
 private:
-    bool initialize(const QStringList &arguments, QString *errorMessage) final;
+    void initialize() final;
     void extensionsInitialized() final;
 
     class QtSupportPluginPrivate *d = nullptr;
diff --git a/src/plugins/remotelinux/remotelinuxplugin.cpp b/src/plugins/remotelinux/remotelinuxplugin.cpp
index 4048c392e4..920d516204 100644
--- a/src/plugins/remotelinux/remotelinuxplugin.cpp
+++ b/src/plugins/remotelinux/remotelinuxplugin.cpp
@@ -89,14 +89,9 @@ QVector<QObject *> RemoteLinuxPlugin::createTestObjects() const
     };
 }
 
-bool RemoteLinuxPlugin::initialize(const QStringList &arguments, QString *errorMessage)
+void RemoteLinuxPlugin::initialize()
 {
-    Q_UNUSED(arguments)
-    Q_UNUSED(errorMessage)
-
     dd = new RemoteLinuxPluginPrivate;
-
-    return true;
 }
 
 } // namespace Internal
diff --git a/src/plugins/remotelinux/remotelinuxplugin.h b/src/plugins/remotelinux/remotelinuxplugin.h
index 19de0334fc..6e4bdce341 100644
--- a/src/plugins/remotelinux/remotelinuxplugin.h
+++ b/src/plugins/remotelinux/remotelinuxplugin.h
@@ -20,7 +20,7 @@ public:
     QVector<QObject *> createTestObjects() const override;
 
 private:
-    bool initialize(const QStringList &arguments, QString *errorMessage) final;
+    void initialize() final;
 };
 
 } // namespace Internal
diff --git a/src/plugins/resourceeditor/resourceeditorplugin.cpp b/src/plugins/resourceeditor/resourceeditorplugin.cpp
index 5fb3fb51e6..d7f2ca8be2 100644
--- a/src/plugins/resourceeditor/resourceeditorplugin.cpp
+++ b/src/plugins/resourceeditor/resourceeditorplugin.cpp
@@ -425,14 +425,9 @@ ResourceEditorPlugin::~ResourceEditorPlugin()
     delete d;
 }
 
-bool ResourceEditorPlugin::initialize(const QStringList &arguments, QString *errorMessage)
+void ResourceEditorPlugin::initialize()
 {
-    Q_UNUSED(arguments)
-    Q_UNUSED(errorMessage)
-
     d = new ResourceEditorPluginPrivate(this);
-
-    return true;
 }
 
 void ResourceEditorPlugin::onUndoStackChanged(ResourceEditorW const *editor,
diff --git a/src/plugins/resourceeditor/resourceeditorplugin.h b/src/plugins/resourceeditor/resourceeditorplugin.h
index abc750298e..dd7390a76b 100644
--- a/src/plugins/resourceeditor/resourceeditorplugin.h
+++ b/src/plugins/resourceeditor/resourceeditorplugin.h
@@ -20,7 +20,7 @@ public:
     void onUndoStackChanged(ResourceEditorW const *editor, bool canUndo, bool canRedo);
 
 private:
-    bool initialize(const QStringList &arguments, QString *errorMessage = nullptr) final;
+    void initialize() final;
     void extensionsInitialized() override;
 
     class ResourceEditorPluginPrivate *d = nullptr;
diff --git a/src/plugins/scxmleditor/scxmleditorplugin.cpp b/src/plugins/scxmleditor/scxmleditorplugin.cpp
index 95a5544fb9..f2a0de589e 100644
--- a/src/plugins/scxmleditor/scxmleditorplugin.cpp
+++ b/src/plugins/scxmleditor/scxmleditorplugin.cpp
@@ -23,14 +23,9 @@ ScxmlEditorPlugin::~ScxmlEditorPlugin()
     delete d;
 }
 
-bool ScxmlEditorPlugin::initialize(const QStringList &arguments, QString *errorString)
+void ScxmlEditorPlugin::initialize()
 {
-    Q_UNUSED(arguments)
-    Q_UNUSED(errorString)
-
     d = new ScxmlEditorPluginPrivate;
-
-    return true;
 }
 
 void ScxmlEditorPlugin::extensionsInitialized()
diff --git a/src/plugins/scxmleditor/scxmleditorplugin.h b/src/plugins/scxmleditor/scxmleditorplugin.h
index 87d5c90135..485ba92def 100644
--- a/src/plugins/scxmleditor/scxmleditorplugin.h
+++ b/src/plugins/scxmleditor/scxmleditorplugin.h
@@ -16,7 +16,7 @@ public:
     ~ScxmlEditorPlugin();
 
 private:
-    bool initialize(const QStringList &arguments, QString *errorString) final;
+    void initialize() final;
     void extensionsInitialized() final;
 
     class ScxmlEditorPluginPrivate *d = nullptr;
diff --git a/src/plugins/serialterminal/serialterminalplugin.cpp b/src/plugins/serialterminal/serialterminalplugin.cpp
index d8a0bf19cf..0b50a50fa4 100644
--- a/src/plugins/serialterminal/serialterminalplugin.cpp
+++ b/src/plugins/serialterminal/serialterminalplugin.cpp
@@ -10,11 +10,8 @@
 namespace SerialTerminal {
 namespace Internal {
 
-bool SerialTerminalPlugin::initialize(const QStringList &arguments, QString *errorString)
+void SerialTerminalPlugin::initialize()
 {
-    Q_UNUSED(arguments)
-    Q_UNUSED(errorString)
-
     m_settings.load(Core::ICore::settings());
 
     // Create serial output pane
@@ -24,8 +21,6 @@ bool SerialTerminalPlugin::initialize(const QStringList &arguments, QString *err
 
     connect(Core::ICore::instance(), &Core::ICore::saveSettingsRequested,
             this, [this] { m_settings.save(Core::ICore::settings()); });
-
-    return true;
 }
 
 ExtensionSystem::IPlugin::ShutdownFlag SerialTerminalPlugin::aboutToShutdown()
diff --git a/src/plugins/serialterminal/serialterminalplugin.h b/src/plugins/serialterminal/serialterminalplugin.h
index 18da3120da..c08fe5a2bd 100644
--- a/src/plugins/serialterminal/serialterminalplugin.h
+++ b/src/plugins/serialterminal/serialterminalplugin.h
@@ -21,7 +21,7 @@ class SerialTerminalPlugin : public ExtensionSystem::IPlugin
 public:
     explicit SerialTerminalPlugin() = default;
 
-    bool initialize(const QStringList &arguments, QString *errorString) final;
+    void initialize() final;
     ShutdownFlag aboutToShutdown() final;
 
 private:
diff --git a/src/plugins/silversearcher/silversearcherplugin.cpp b/src/plugins/silversearcher/silversearcherplugin.cpp
index ad0b862ec3..49f1b1da4d 100644
--- a/src/plugins/silversearcher/silversearcherplugin.cpp
+++ b/src/plugins/silversearcher/silversearcherplugin.cpp
@@ -8,14 +8,9 @@
 namespace SilverSearcher {
 namespace Internal {
 
-bool SilverSearcherPlugin::initialize(const QStringList &arguments, QString *errorString)
+void SilverSearcherPlugin::initialize()
 {
-    Q_UNUSED(arguments)
-    Q_UNUSED(errorString)
-
     new FindInFilesSilverSearcher(this);
-
-    return true;
 }
 
 #ifdef WITH_TESTS
diff --git a/src/plugins/silversearcher/silversearcherplugin.h b/src/plugins/silversearcher/silversearcherplugin.h
index 6e2dc68b4a..15d45da06b 100644
--- a/src/plugins/silversearcher/silversearcherplugin.h
+++ b/src/plugins/silversearcher/silversearcherplugin.h
@@ -14,7 +14,7 @@ class SilverSearcherPlugin : public ExtensionSystem::IPlugin
     Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QtCreatorPlugin" FILE "SilverSearcher.json")
 
 public:
-    bool initialize(const QStringList &arguments, QString *errorString) override;
+    void initialize() override;
 
 #ifdef WITH_TESTS
 private:
diff --git a/src/plugins/squish/squishplugin.cpp b/src/plugins/squish/squishplugin.cpp
index fe9d9f1d13..f72f70df78 100644
--- a/src/plugins/squish/squishplugin.cpp
+++ b/src/plugins/squish/squishplugin.cpp
@@ -126,11 +126,10 @@ bool SquishPluginPrivate::initializeGlobalScripts()
     return true;
 }
 
-bool SquishPlugin::initialize(const QStringList &, QString *)
+void SquishPlugin::initialize()
 {
     dd = new SquishPluginPrivate;
     ProjectExplorer::JsonWizardFactory::addWizardPath(":/squish/wizard/");
-    return true;
 }
 
 bool SquishPlugin::delayedInitialize()
diff --git a/src/plugins/squish/squishplugin.h b/src/plugins/squish/squishplugin.h
index 76a95cc67f..86b5eca393 100644
--- a/src/plugins/squish/squishplugin.h
+++ b/src/plugins/squish/squishplugin.h
@@ -22,7 +22,7 @@ public:
 
     static SquishSettings *squishSettings();
 
-    bool initialize(const QStringList &arguments, QString *errorString) override;
+    void initialize() override;
     bool delayedInitialize() override;
     ShutdownFlag aboutToShutdown() override;
 };
diff --git a/src/plugins/studiowelcome/studiowelcomeplugin.cpp b/src/plugins/studiowelcome/studiowelcomeplugin.cpp
index bf80c749a9..ea57019031 100644
--- a/src/plugins/studiowelcome/studiowelcomeplugin.cpp
+++ b/src/plugins/studiowelcome/studiowelcomeplugin.cpp
@@ -470,17 +470,12 @@ StudioWelcomePlugin::~StudioWelcomePlugin()
     delete m_welcomeMode;
 }
 
-bool StudioWelcomePlugin::initialize(const QStringList &arguments, QString *errorString)
+void StudioWelcomePlugin::initialize()
 {
-    Q_UNUSED(arguments)
-    Q_UNUSED(errorString)
-
     qmlRegisterType<ProjectModel>("projectmodel", 1, 0, "ProjectModel");
     qmlRegisterType<UsageStatisticPluginModel>("usagestatistics", 1, 0, "UsageStatisticModel");
 
     m_welcomeMode = new WelcomeMode;
-
-    return true;
 }
 
 static bool forceDownLoad()
diff --git a/src/plugins/studiowelcome/studiowelcomeplugin.h b/src/plugins/studiowelcome/studiowelcomeplugin.h
index c9219734ca..5f0a2a4dc6 100644
--- a/src/plugins/studiowelcome/studiowelcomeplugin.h
+++ b/src/plugins/studiowelcome/studiowelcomeplugin.h
@@ -50,7 +50,7 @@ public:
     StudioWelcomePlugin();
     ~StudioWelcomePlugin() final;
 
-    bool initialize(const QStringList &arguments, QString *errorString) override;
+    void initialize() override;
     void extensionsInitialized() override;
     bool delayedInitialize() override;
 
diff --git a/src/plugins/subversion/subversionplugin.cpp b/src/plugins/subversion/subversionplugin.cpp
index 0018b195ec..6fdf331be0 100644
--- a/src/plugins/subversion/subversionplugin.cpp
+++ b/src/plugins/subversion/subversionplugin.cpp
@@ -343,11 +343,9 @@ bool SubversionPluginPrivate::isCommitEditorOpen() const
     return !m_commitMessageFileName.isEmpty();
 }
 
-bool SubversionPlugin::initialize(const QStringList & /*arguments */, QString *errorMessage)
+void SubversionPlugin::initialize()
 {
-    Q_UNUSED(errorMessage)
     dd = new SubversionPluginPrivate;
-    return true;
 }
 
 void SubversionPlugin::extensionsInitialized()
diff --git a/src/plugins/subversion/subversionplugin.h b/src/plugins/subversion/subversionplugin.h
index a2823de519..c5ebc17884 100644
--- a/src/plugins/subversion/subversionplugin.h
+++ b/src/plugins/subversion/subversionplugin.h
@@ -20,7 +20,7 @@ class SubversionPlugin final : public ExtensionSystem::IPlugin
 
     ~SubversionPlugin() final;
 
-    bool initialize(const QStringList &arguments, QString *errorMessage) final;
+    void initialize() final;
     void extensionsInitialized() final;
 
 #ifdef WITH_TESTS
diff --git a/src/plugins/texteditor/texteditorplugin.cpp b/src/plugins/texteditor/texteditorplugin.cpp
index 254389c957..e97453adda 100644
--- a/src/plugins/texteditor/texteditorplugin.cpp
+++ b/src/plugins/texteditor/texteditorplugin.cpp
@@ -88,11 +88,8 @@ TextEditorPlugin *TextEditorPlugin::instance()
     return m_instance;
 }
 
-bool TextEditorPlugin::initialize(const QStringList &arguments, QString *errorMessage)
+void TextEditorPlugin::initialize()
 {
-    Q_UNUSED(arguments)
-    Q_UNUSED(errorMessage)
-
     d = new TextEditorPluginPrivate;
 
     Context context(TextEditor::Constants::C_TEXTEDITOR);
@@ -143,8 +140,6 @@ bool TextEditorPlugin::initialize(const QStringList &arguments, QString *errorMe
                                     Tr::tr("Text", "SnippetProvider"));
 
     d->createStandardContextMenu();
-
-    return true;
 }
 
 void TextEditorPluginPrivate::extensionsInitialized()
diff --git a/src/plugins/texteditor/texteditorplugin.h b/src/plugins/texteditor/texteditorplugin.h
index dd0c3ed24d..067e4e9631 100644
--- a/src/plugins/texteditor/texteditorplugin.h
+++ b/src/plugins/texteditor/texteditorplugin.h
@@ -25,7 +25,7 @@ public:
     ShutdownFlag aboutToShutdown() override;
 
 private:
-    bool initialize(const QStringList &arguments, QString *errorMessage) final;
+    void initialize() final;
     void extensionsInitialized() final;
 
     class TextEditorPluginPrivate *d = nullptr;
diff --git a/src/plugins/todo/todoplugin.cpp b/src/plugins/todo/todoplugin.cpp
index cecee7fcda..764217b76b 100644
--- a/src/plugins/todo/todoplugin.cpp
+++ b/src/plugins/todo/todoplugin.cpp
@@ -107,14 +107,9 @@ TodoPlugin::~TodoPlugin()
     delete d;
 }
 
-bool TodoPlugin::initialize(const QStringList& args, QString *errMsg)
+void TodoPlugin::initialize()
 {
-    Q_UNUSED(args)
-    Q_UNUSED(errMsg)
-
     d = new TodoPluginPrivate;
-
-    return true;
 }
 
 } // namespace Internal
diff --git a/src/plugins/todo/todoplugin.h b/src/plugins/todo/todoplugin.h
index 51953c1423..73cf865cb5 100644
--- a/src/plugins/todo/todoplugin.h
+++ b/src/plugins/todo/todoplugin.h
@@ -18,7 +18,7 @@ public:
     TodoPlugin();
     ~TodoPlugin() final;
 
-    bool initialize(const QStringList &arguments, QString *errorString) final;
+    void initialize() final;
 
 private:
     class TodoPluginPrivate *d = nullptr;
diff --git a/src/plugins/valgrind/valgrindplugin.cpp b/src/plugins/valgrind/valgrindplugin.cpp
index 22b4c5450e..c6825a4ce9 100644
--- a/src/plugins/valgrind/valgrindplugin.cpp
+++ b/src/plugins/valgrind/valgrindplugin.cpp
@@ -60,13 +60,11 @@ ValgrindPlugin::~ValgrindPlugin()
     delete d;
 }
 
-bool ValgrindPlugin::initialize(const QStringList &, QString *)
+void ValgrindPlugin::initialize()
 {
     d = new ValgrindPluginPrivate;
 
     RunConfiguration::registerAspect<ValgrindRunConfigurationAspect>();
-
-    return true;
 }
 
 QVector<QObject *> ValgrindPlugin::createTestObjects() const
diff --git a/src/plugins/valgrind/valgrindplugin.h b/src/plugins/valgrind/valgrindplugin.h
index 6430868848..9c8afda19f 100644
--- a/src/plugins/valgrind/valgrindplugin.h
+++ b/src/plugins/valgrind/valgrindplugin.h
@@ -17,7 +17,7 @@ public:
     ValgrindPlugin() = default;
     ~ValgrindPlugin() final;
 
-    bool initialize(const QStringList &arguments, QString *errorString) final;
+    void initialize() final;
 
 private:
     QVector<QObject *> createTestObjects() const override;
diff --git a/src/plugins/vcsbase/vcsplugin.cpp b/src/plugins/vcsbase/vcsplugin.cpp
index da1740d691..e5108942f5 100644
--- a/src/plugins/vcsbase/vcsplugin.cpp
+++ b/src/plugins/vcsbase/vcsplugin.cpp
@@ -59,11 +59,8 @@ VcsPlugin::~VcsPlugin()
     delete d;
 }
 
-bool VcsPlugin::initialize(const QStringList &arguments, QString *errorMessage)
+void VcsPlugin::initialize()
 {
-    Q_UNUSED(arguments)
-    Q_UNUSED(errorMessage)
-
     d = new VcsPluginPrivate;
 
     EditorManager::addCloseEditorListener([this](IEditor *editor) -> bool {
@@ -114,8 +111,6 @@ bool VcsPlugin::initialize(const QStringList &arguments, QString *errorMessage)
 
     // Just touch VCS Output Pane before initialization
     VcsOutputWindow::instance();
-
-    return true;
 }
 
 VcsPlugin *VcsPlugin::instance()
diff --git a/src/plugins/vcsbase/vcsplugin.h b/src/plugins/vcsbase/vcsplugin.h
index 4b9007a09b..83157fc140 100644
--- a/src/plugins/vcsbase/vcsplugin.h
+++ b/src/plugins/vcsbase/vcsplugin.h
@@ -30,7 +30,7 @@ public:
     VcsPlugin();
     ~VcsPlugin() override;
 
-    bool initialize(const QStringList &arguments, QString *errorMessage) override;
+    void initialize() override;
 
     static VcsPlugin *instance();
 
diff --git a/src/plugins/webassembly/webassemblyplugin.cpp b/src/plugins/webassembly/webassemblyplugin.cpp
index c0c05d20bd..2d342030d5 100644
--- a/src/plugins/webassembly/webassemblyplugin.cpp
+++ b/src/plugins/webassembly/webassemblyplugin.cpp
@@ -51,14 +51,9 @@ WebAssemblyPlugin::~WebAssemblyPlugin()
     dd = nullptr;
 }
 
-bool WebAssemblyPlugin::initialize(const QStringList& arguments, QString* errorString)
+void WebAssemblyPlugin::initialize()
 {
-    Q_UNUSED(arguments)
-    Q_UNUSED(errorString)
-
     dd = new WebAssemblyPluginPrivate;
-
-    return true;
 }
 
 void WebAssemblyPlugin::extensionsInitialized()
diff --git a/src/plugins/webassembly/webassemblyplugin.h b/src/plugins/webassembly/webassemblyplugin.h
index 40c5f8e487..20c9e3e085 100644
--- a/src/plugins/webassembly/webassemblyplugin.h
+++ b/src/plugins/webassembly/webassemblyplugin.h
@@ -18,7 +18,7 @@ public:
     WebAssemblyPlugin();
     ~WebAssemblyPlugin() override;
 
-    bool initialize(const QStringList &arguments, QString *errorString) override;
+    void initialize() override;
     void extensionsInitialized() override;
     static void askUserAboutEmSdkSetup();