diff --git a/kdevplatform/interfaces/idocumentationprovider.h b/kdevplatform/interfaces/idocumentationprovider.h
--- a/kdevplatform/interfaces/idocumentationprovider.h
+++ b/kdevplatform/interfaces/idocumentationprovider.h
@@ -55,7 +55,7 @@
     virtual IDocumentation::Ptr homePage() const = 0;
 
 Q_SIGNALS:
-    virtual void addHistory(const KDevelop::IDocumentation::Ptr& doc) const = 0;
+    virtual void addHistory(const KDevelop::IDocumentation::Ptr& doc) = 0;
 };
 
 }
diff --git a/kdevplatform/interfaces/idocumentationproviderprovider.h b/kdevplatform/interfaces/idocumentationproviderprovider.h
--- a/kdevplatform/interfaces/idocumentationproviderprovider.h
+++ b/kdevplatform/interfaces/idocumentationproviderprovider.h
@@ -36,7 +36,7 @@
         virtual QList<IDocumentationProvider*> providers() = 0;
 
 Q_SIGNALS:
-    virtual void changedProvidersList() const=0;
+    virtual void changedProvidersList() = 0;
 };
 
 }
diff --git a/kdevplatform/interfaces/itestcontroller.h b/kdevplatform/interfaces/itestcontroller.h
--- a/kdevplatform/interfaces/itestcontroller.h
+++ b/kdevplatform/interfaces/itestcontroller.h
@@ -119,19 +119,19 @@
     /**
      * Emitted whenever a new test suite gets added.
      */
-    void testSuiteAdded(KDevelop::ITestSuite* suite) const;
+    void testSuiteAdded(KDevelop::ITestSuite* suite);
     /**
      * Emitted whenever a test suite gets removed.
      */
-    void testSuiteRemoved(KDevelop::ITestSuite* suite) const;
+    void testSuiteRemoved(KDevelop::ITestSuite* suite);
     /**
      * Emitted after a test suite was run.
      */
-    void testRunFinished(KDevelop::ITestSuite* suite, const KDevelop::TestResult& result) const;
+    void testRunFinished(KDevelop::ITestSuite* suite, const KDevelop::TestResult& result);
      /**
      * Emitted when a test suite starts.
      */
-    void testRunStarted(KDevelop::ITestSuite* suite, const QStringList& test_cases) const;
+    void testRunStarted(KDevelop::ITestSuite* suite, const QStringList& test_cases);
 };
 
 }
diff --git a/plugins/cmake/cmakedocumentation.h b/plugins/cmake/cmakedocumentation.h
--- a/plugins/cmake/cmakedocumentation.h
+++ b/plugins/cmake/cmakedocumentation.h
@@ -57,7 +57,7 @@
         QString descriptionForIdentifier(const QString& identifier, Type t) const;
         
     Q_SIGNALS:
-        void addHistory(const KDevelop::IDocumentation::Ptr& doc) const override;
+        void addHistory(const KDevelop::IDocumentation::Ptr& doc) override;
     
     private:
         CMakeCommandsContents* m_index;
diff --git a/plugins/debuggercommon/midebugsession.h b/plugins/debuggercommon/midebugsession.h
--- a/plugins/debuggercommon/midebugsession.h
+++ b/plugins/debuggercommon/midebugsession.h
@@ -66,61 +66,61 @@
     /**
      * Emits when received standard output lines from inferior
      */
-    void inferiorStdoutLines(const QStringList &lines) const;
+    void inferiorStdoutLines(const QStringList& lines);
 
     /**
      * Emits when received standard error lines from inferior
      */
-    void inferiorStderrLines(const QStringList &lines) const;
+    void inferiorStderrLines(const QStringList& lines);
 
-    void inferiorStopped(const MI::AsyncRecord &r) const;
+    void inferiorStopped(const MI::AsyncRecord& r);
 
-    void inferiorRunning() const;
+    void inferiorRunning();
 
     /**
      * Emits when received standard output from debugger for user commands
      */
-    void debuggerUserCommandOutput(const QString &output) const;
+    void debuggerUserCommandOutput(const QString &output);
 
     /**
      * Emits when received standard output from debugger for internal commands
      */
-    void debuggerInternalCommandOutput(const QString &output) const;
+    void debuggerInternalCommandOutput(const QString& output);
 
     /**
      * Emits when received internal output from debugger
      */
-    void debuggerInternalOutput(const QString &output) const;
+    void debuggerInternalOutput(const QString& output) const;
 
     /**
      * Emits when received standard output from inferior's tty
      */
-    void inferiorTtyStdout(const QByteArray &output) const;
+    void inferiorTtyStdout(const QByteArray& output);
 
     /**
      * Emits when received standard output from inferior's tty
      */
-    void inferiorTtyStderr(const QByteArray &output) const;
+    void inferiorTtyStderr(const QByteArray& output);
 
     /**
      * Emits when the debugger instance state changes
      */
-    void debuggerStateChanged(DBGStateFlags oldState, DBGStateFlags newState) const;
+    void debuggerStateChanged(DBGStateFlags oldState, DBGStateFlags newState);
 
     /**
      * Emits when there's message needed to be show to user.
      */
-    void showMessage(const QString& message, int timeout) const;
+    void showMessage(const QString& message, int timeout);
 
     /**
      * Emits when the debugger console view need to be raised.
      */
-    void raiseDebuggerConsoleViews() const;
+    void raiseDebuggerConsoleViews();
 
     /**
      * Emits when need to reset
      */
-    void reset() const;
+    void reset();
 
 public:
     bool debuggerStateIsOn(DBGStateFlags state) const;
diff --git a/plugins/manpage/manpageplugin.h b/plugins/manpage/manpageplugin.h
--- a/plugins/manpage/manpageplugin.h
+++ b/plugins/manpage/manpageplugin.h
@@ -50,7 +50,7 @@
     QProgressBar* progressBar() const;
 
 Q_SIGNALS:
-    void addHistory(const KDevelop::IDocumentation::Ptr& doc ) const override;
+    void addHistory(const KDevelop::IDocumentation::Ptr& doc) override;
 
 private:
     KDevelop::IDocumentation::Ptr documentationForIdentifier(const QString& identifier) const;
diff --git a/plugins/qthelp/qthelpplugin.h b/plugins/qthelp/qthelpplugin.h
--- a/plugins/qthelp/qthelpplugin.h
+++ b/plugins/qthelp/qthelpplugin.h
@@ -49,7 +49,7 @@
     public Q_SLOTS:
         void readConfig();
     Q_SIGNALS:
-        void changedProvidersList() const override;
+        void changedProvidersList() override;
     private:
         void loadQtDocumentation(bool loadQtDoc);
         void searchHelpDirectory(QStringList& pathList, QStringList& nameList, QStringList& iconList, const QString& searchDir);
diff --git a/plugins/qthelp/qthelpproviderabstract.h b/plugins/qthelp/qthelpproviderabstract.h
--- a/plugins/qthelp/qthelpproviderabstract.h
+++ b/plugins/qthelp/qthelpproviderabstract.h
@@ -50,9 +50,9 @@
 
     HelpNetworkAccessManager* networkAccess() const;
 public Q_SLOTS:
-    void jumpedTo(const QUrl& newUrl) const;
+    void jumpedTo(const QUrl& newUrl);
 Q_SIGNALS:
-    void addHistory(const KDevelop::IDocumentation::Ptr& doc) const override;
+    void addHistory(const KDevelop::IDocumentation::Ptr& doc) override;
 protected:
     QHelpEngine m_engine;
     HelpNetworkAccessManager* const m_nam;
diff --git a/plugins/qthelp/qthelpproviderabstract.cpp b/plugins/qthelp/qthelpproviderabstract.cpp
--- a/plugins/qthelp/qthelpproviderabstract.cpp
+++ b/plugins/qthelp/qthelpproviderabstract.cpp
@@ -91,9 +91,9 @@
     return IDocumentation::Ptr(new QtHelpDocumentation(name, m_engine.indexModel()->linksForKeyword(name)));
 }
 
-void QtHelpProviderAbstract::jumpedTo(const QUrl& newUrl) const
+void QtHelpProviderAbstract::jumpedTo(const QUrl& newUrl)
 {
-    QtHelpDocumentation::s_provider = const_cast<QtHelpProviderAbstract*>(this);
+    QtHelpDocumentation::s_provider = this;
     QMap<QString, QUrl> info;
     info.insert(newUrl.toString(), newUrl);
     IDocumentation::Ptr doc(new QtHelpDocumentation(newUrl.toString(), info));