diff --git a/src/plugins/android/androidtoolchain.h b/src/plugins/android/androidtoolchain.h
index dddb5506f39..c8c93106999 100644
--- a/src/plugins/android/androidtoolchain.h
+++ b/src/plugins/android/androidtoolchain.h
@@ -40,25 +40,25 @@ namespace Internal {
 class AndroidToolChain : public ProjectExplorer::GccToolChain
 {
 public:
-    ~AndroidToolChain();
+    ~AndroidToolChain() override;
 
-    QString type() const;
-    QString typeDisplayName() const;
+    QString type() const override;
+    QString typeDisplayName() const override;
 
-    bool isValid() const;
+    bool isValid() const override;
 
-    void addToEnvironment(Utils::Environment &env) const;
+    void addToEnvironment(Utils::Environment &env) const override;
 
-    bool operator ==(const ProjectExplorer::ToolChain &) const;
+    bool operator ==(const ProjectExplorer::ToolChain &) const override;
 
-    ProjectExplorer::ToolChainConfigWidget *configurationWidget();
-    virtual Utils::FileName suggestedDebugger() const;
+    ProjectExplorer::ToolChainConfigWidget *configurationWidget() override;
+    virtual Utils::FileName suggestedDebugger() const override;
     Utils::FileName suggestedGdbServer() const;
 
-    QVariantMap toMap() const;
-    bool fromMap(const QVariantMap &data);
-    QList<Utils::FileName> suggestedMkspecList() const;
-    QString makeCommand(const Utils::Environment &environment) const;
+    QVariantMap toMap() const override;
+    bool fromMap(const QVariantMap &data) override;
+    QList<Utils::FileName> suggestedMkspecList() const override;
+    QString makeCommand(const Utils::Environment &environment) const override;
 
     QString ndkToolChainVersion() const;
 
@@ -66,7 +66,7 @@ public:
     void setSecondaryToolChain(bool b);
 
 protected:
-    QList<ProjectExplorer::Abi> detectSupportedAbis() const;
+    QList<ProjectExplorer::Abi> detectSupportedAbis() const override;
 
 private:
     explicit AndroidToolChain(const ProjectExplorer::Abi &abi, const QString &ndkToolChainVersion, Detection d);
@@ -88,10 +88,10 @@ public:
     AndroidToolChainConfigWidget(AndroidToolChain *);
 
 private:
-    void applyImpl() {}
-    void discardImpl() {}
-    bool isDirtyImpl() const { return false; }
-    void makeReadOnlyImpl() {}
+    void applyImpl() override {}
+    void discardImpl() override {}
+    bool isDirtyImpl() const override { return false; }
+    void makeReadOnlyImpl() override {}
 };
 
 
@@ -102,9 +102,9 @@ class AndroidToolChainFactory : public ProjectExplorer::ToolChainFactory
 public:
     AndroidToolChainFactory();
 
-    QList<ProjectExplorer::ToolChain *> autoDetect();
-    bool canRestore(const QVariantMap &data);
-    ProjectExplorer::ToolChain *restore(const QVariantMap &data);
+    QList<ProjectExplorer::ToolChain *> autoDetect() override;
+    bool canRestore(const QVariantMap &data) override;
+    ProjectExplorer::ToolChain *restore(const QVariantMap &data) override;
 
     class AndroidToolChainInformation
     {
diff --git a/src/plugins/projectexplorer/abstractmsvctoolchain.h b/src/plugins/projectexplorer/abstractmsvctoolchain.h
index b5c15f18bc3..8797d69945f 100644
--- a/src/plugins/projectexplorer/abstractmsvctoolchain.h
+++ b/src/plugins/projectexplorer/abstractmsvctoolchain.h
@@ -47,25 +47,26 @@ public:
     explicit AbstractMsvcToolChain(const QByteArray &id, Detection d, const Abi &abi, const QString& vcvarsBat);
     explicit AbstractMsvcToolChain(const QByteArray &id, Detection d);
 
-    Abi targetAbi() const;
+    Abi targetAbi() const override;
 
-    bool isValid() const;
+    bool isValid() const override;
 
-    QByteArray predefinedMacros(const QStringList &cxxflags) const;
-    CompilerFlags compilerFlags(const QStringList &cxxflags) const;
-    WarningFlags warningFlags(const QStringList &cflags) const;
-    QList<HeaderPath> systemHeaderPaths(const QStringList &cxxflags, const Utils::FileName &sysRoot) const;
-    void addToEnvironment(Utils::Environment &env) const;
+    QByteArray predefinedMacros(const QStringList &cxxflags) const override;
+    CompilerFlags compilerFlags(const QStringList &cxxflags) const override;
+    WarningFlags warningFlags(const QStringList &cflags) const override;
+    QList<HeaderPath> systemHeaderPaths(const QStringList &cxxflags,
+                                        const Utils::FileName &sysRoot) const override;
+    void addToEnvironment(Utils::Environment &env) const override;
 
-    QString makeCommand(const Utils::Environment &environment) const;
-    Utils::FileName compilerCommand() const;
-    IOutputParser *outputParser() const;
+    QString makeCommand(const Utils::Environment &environment) const override;
+    Utils::FileName compilerCommand() const override;
+    IOutputParser *outputParser() const override;
 
-    bool canClone() const;
+    bool canClone() const override;
 
     QString varsBat() const { return m_vcvarsBat; }
 
-    bool operator ==(const ToolChain &) const;
+    bool operator ==(const ToolChain &) const override;
 
     static bool generateEnvironmentSettings(Utils::Environment &env,
                                             const QString &batchFile,
diff --git a/src/plugins/projectexplorer/customtoolchain.h b/src/plugins/projectexplorer/customtoolchain.h
index 1c7f1847b57..eaac3687696 100644
--- a/src/plugins/projectexplorer/customtoolchain.h
+++ b/src/plugins/projectexplorer/customtoolchain.h
@@ -76,37 +76,38 @@ public:
         OutputParserCount
     };
 
-    QString type() const;
-    QString typeDisplayName() const;
-    Abi targetAbi() const;
+    QString type() const override;
+    QString typeDisplayName() const override;
+    Abi targetAbi() const override;
     void setTargetAbi(const Abi &);
 
-    bool isValid() const;
+    bool isValid() const override;
 
-    QByteArray predefinedMacros(const QStringList &cxxflags) const;
-    CompilerFlags compilerFlags(const QStringList &cxxflags) const;
-    WarningFlags warningFlags(const QStringList &cxxflags) const;
+    QByteArray predefinedMacros(const QStringList &cxxflags) const override;
+    CompilerFlags compilerFlags(const QStringList &cxxflags) const override;
+    WarningFlags warningFlags(const QStringList &cxxflags) const override;
     const QStringList &rawPredefinedMacros() const;
     void setPredefinedMacros(const QStringList &list);
 
-    QList<HeaderPath> systemHeaderPaths(const QStringList &cxxFlags, const Utils::FileName &) const;
-    void addToEnvironment(Utils::Environment &env) const;
-    QList<Utils::FileName> suggestedMkspecList() const;
-    IOutputParser *outputParser() const;
+    QList<HeaderPath> systemHeaderPaths(const QStringList &cxxFlags,
+                                        const Utils::FileName &) const override;
+    void addToEnvironment(Utils::Environment &env) const override;
+    QList<Utils::FileName> suggestedMkspecList() const override;
+    IOutputParser *outputParser() const override;
     QStringList headerPathsList() const;
     void setHeaderPaths(const QStringList &list);
 
-    QVariantMap toMap() const;
-    bool fromMap(const QVariantMap &data);
+    QVariantMap toMap() const override;
+    bool fromMap(const QVariantMap &data) override;
 
-    ToolChainConfigWidget *configurationWidget();
+    ToolChainConfigWidget *configurationWidget() override;
 
-    bool operator ==(const ToolChain &) const;
+    bool operator ==(const ToolChain &) const override;
 
     void setCompilerCommand(const Utils::FileName &);
-    Utils::FileName compilerCommand() const;
+    Utils::FileName compilerCommand() const override;
     void setMakeCommand(const Utils::FileName &);
-    QString makeCommand(const Utils::Environment &environment) const;
+    QString makeCommand(const Utils::Environment &environment) const override;
 
     void setCxx11Flags(const QStringList &);
     const QStringList &cxx11Flags() const;
@@ -114,7 +115,7 @@ public:
     void setMkspecs(const QString &);
     QString mkspecs() const;
 
-    ToolChain *clone() const;
+    ToolChain *clone() const override;
 
     OutputParser outputParserType() const;
     void setOutputParserType(OutputParser parser);
@@ -154,12 +155,12 @@ class CustomToolChainFactory : public ToolChainFactory
 public:
     CustomToolChainFactory();
 
-    bool canCreate();
-    ToolChain *create();
+    bool canCreate() override;
+    ToolChain *create() override;
 
     // Used by the ToolChainManager to restore user-generated tool chains
-    bool canRestore(const QVariantMap &data);
-    ToolChain *restore(const QVariantMap &data);
+    bool canRestore(const QVariantMap &data) override;
+    ToolChain *restore(const QVariantMap &data) override;
 
 protected:
     virtual CustomToolChain *createToolChain(bool autoDetect);
@@ -186,10 +187,10 @@ private slots:
     void openCustomParserSettingsDialog();
 
 protected:
-    void applyImpl();
-    void discardImpl() { setFromToolchain(); }
-    bool isDirtyImpl() const;
-    void makeReadOnlyImpl();
+    void applyImpl() override;
+    void discardImpl() override { setFromToolchain(); }
+    bool isDirtyImpl() const override;
+    void makeReadOnlyImpl() override;
 
     void setFromToolchain();
 
diff --git a/src/plugins/projectexplorer/gcctoolchain.h b/src/plugins/projectexplorer/gcctoolchain.h
index 4af8224d1ba..41cc4e9a8bb 100644
--- a/src/plugins/projectexplorer/gcctoolchain.h
+++ b/src/plugins/projectexplorer/gcctoolchain.h
@@ -58,40 +58,41 @@ class PROJECTEXPLORER_EXPORT GccToolChain : public ToolChain
 {
 public:
     GccToolChain(const QByteArray &id, Detection d);
-    QString type() const;
-    QString typeDisplayName() const;
-    Abi targetAbi() const;
+    QString type() const override;
+    QString typeDisplayName() const override;
+    Abi targetAbi() const override;
     QString version() const;
     QList<Abi> supportedAbis() const;
     void setTargetAbi(const Abi &);
 
-    bool isValid() const;
+    bool isValid() const override;
 
-    QByteArray predefinedMacros(const QStringList &cxxflags) const;
-    CompilerFlags compilerFlags(const QStringList &cxxflags) const;
-    WarningFlags warningFlags(const QStringList &cflags) const;
+    QByteArray predefinedMacros(const QStringList &cxxflags) const override;
+    CompilerFlags compilerFlags(const QStringList &cxxflags) const override;
+    WarningFlags warningFlags(const QStringList &cflags) const override;
 
-    QList<HeaderPath> systemHeaderPaths(const QStringList &cxxflags, const Utils::FileName &sysRoot) const;
-    void addToEnvironment(Utils::Environment &env) const;
-    QString makeCommand(const Utils::Environment &environment) const;
-    QList<Utils::FileName> suggestedMkspecList() const;
-    IOutputParser *outputParser() const;
+    QList<HeaderPath> systemHeaderPaths(const QStringList &cxxflags,
+                                        const Utils::FileName &sysRoot) const override;
+    void addToEnvironment(Utils::Environment &env) const override;
+    QString makeCommand(const Utils::Environment &environment) const override;
+    QList<Utils::FileName> suggestedMkspecList() const override;
+    IOutputParser *outputParser() const override;
 
-    QVariantMap toMap() const;
-    bool fromMap(const QVariantMap &data);
+    QVariantMap toMap() const override;
+    bool fromMap(const QVariantMap &data) override;
 
-    ToolChainConfigWidget *configurationWidget();
+    ToolChainConfigWidget *configurationWidget() override;
 
-    bool operator ==(const ToolChain &) const;
+    bool operator ==(const ToolChain &) const override;
 
     void resetToolChain(const Utils::FileName &);
-    Utils::FileName compilerCommand() const;
+    Utils::FileName compilerCommand() const override;
     void setPlatformCodeGenFlags(const QStringList &);
     QStringList platformCodeGenFlags() const;
     void setPlatformLinkerFlags(const QStringList &);
     QStringList platformLinkerFlags() const;
 
-    ToolChain *clone() const;
+    ToolChain *clone() const override;
 
     static void addCommandPathToEnvironment(const Utils::FileName &command, Utils::Environment &env);
 
@@ -162,22 +163,22 @@ class PROJECTEXPLORER_EXPORT ClangToolChain : public GccToolChain
 {
 public:
     explicit ClangToolChain(Detection d);
-    QString type() const;
-    QString typeDisplayName() const;
-    QString makeCommand(const Utils::Environment &environment) const;
+    QString type() const override;
+    QString typeDisplayName() const override;
+    QString makeCommand(const Utils::Environment &environment) const override;
 
-    CompilerFlags compilerFlags(const QStringList &cxxflags) const;
-    WarningFlags warningFlags(const QStringList &cflags) const;
+    CompilerFlags compilerFlags(const QStringList &cxxflags) const override;
+    WarningFlags warningFlags(const QStringList &cflags) const override;
 
-    IOutputParser *outputParser() const;
+    IOutputParser *outputParser() const override;
 
-    ToolChain *clone() const;
+    ToolChain *clone() const override;
 
-    QList<Utils::FileName> suggestedMkspecList() const;
-    void addToEnvironment(Utils::Environment &env) const;
+    QList<Utils::FileName> suggestedMkspecList() const override;
+    void addToEnvironment(Utils::Environment &env) const override;
 
 protected:
-    virtual CompilerFlags defaultCompilerFlags() const;
+    virtual CompilerFlags defaultCompilerFlags() const override;
 
 private:
     friend class Internal::ClangToolChainFactory;
@@ -191,13 +192,13 @@ private:
 class PROJECTEXPLORER_EXPORT MingwToolChain : public GccToolChain
 {
 public:
-    QString type() const;
-    QString typeDisplayName() const;
-    QString makeCommand(const Utils::Environment &environment) const;
+    QString type() const override;
+    QString typeDisplayName() const override;
+    QString makeCommand(const Utils::Environment &environment) const override;
 
-    ToolChain *clone() const;
+    ToolChain *clone() const override;
 
-    QList<Utils::FileName> suggestedMkspecList() const;
+    QList<Utils::FileName> suggestedMkspecList() const override;
 
 private:
     explicit MingwToolChain(Detection d);
@@ -213,15 +214,15 @@ private:
 class PROJECTEXPLORER_EXPORT LinuxIccToolChain : public GccToolChain
 {
 public:
-    QString type() const;
-    QString typeDisplayName() const;
+    QString type() const override;
+    QString typeDisplayName() const override;
 
-    CompilerFlags compilerFlags(const QStringList &cxxflags) const;
-    IOutputParser *outputParser() const;
+    CompilerFlags compilerFlags(const QStringList &cxxflags) const override;
+    IOutputParser *outputParser() const override;
 
-    ToolChain *clone() const;
+    ToolChain *clone() const override;
 
-    QList<Utils::FileName> suggestedMkspecList() const;
+    QList<Utils::FileName> suggestedMkspecList() const override;
 
 private:
     explicit LinuxIccToolChain(Detection d);
diff --git a/src/plugins/projectexplorer/msvctoolchain.h b/src/plugins/projectexplorer/msvctoolchain.h
index 3ee9e8d192d..6f5ad6ab8ff 100644
--- a/src/plugins/projectexplorer/msvctoolchain.h
+++ b/src/plugins/projectexplorer/msvctoolchain.h
@@ -60,29 +60,29 @@ public:
 
     MsvcToolChain(const QString &name, const Abi &abi,
                   const QString &varsBat, const QString &varsBatArg, Detection d = ManualDetection);
-    bool isValid() const;
-    QList<Utils::FileName> suggestedMkspecList() const;
+    bool isValid() const override;
+    QList<Utils::FileName> suggestedMkspecList() const override;
 
     static MsvcToolChain *readFromMap(const QVariantMap &data);
 
-    QString type() const;
-    QString typeDisplayName() const;
+    QString type() const override;
+    QString typeDisplayName() const override;
 
-    QVariantMap toMap() const;
-    bool fromMap(const QVariantMap &data);
+    QVariantMap toMap() const override;
+    bool fromMap(const QVariantMap &data) override;
 
-    ToolChainConfigWidget *configurationWidget();
+    ToolChainConfigWidget *configurationWidget() override;
 
-    ToolChain *clone() const;
+    ToolChain *clone() const override;
 
     QString varsBatArg() const { return m_varsBatArg; }
 
-    bool operator == (const ToolChain &) const;
+    bool operator == (const ToolChain &) const override;
 
 protected:
-    Utils::Environment readEnvironmentSetting(Utils::Environment& env) const;
+    Utils::Environment readEnvironmentSetting(Utils::Environment& env) const override;
     QByteArray msvcPredefinedMacros(const QStringList cxxflags,
-                                    const Utils::Environment &env) const;
+                                    const Utils::Environment &env) const override;
 
 private:
     MsvcToolChain();
@@ -101,11 +101,11 @@ class MsvcToolChainFactory : public ToolChainFactory
 public:
     MsvcToolChainFactory();
 
-    QList<ToolChain *> autoDetect();
+    QList<ToolChain *> autoDetect() override;
 
-    bool canRestore(const QVariantMap &data);
-    ToolChain *restore(const QVariantMap &data)
-        { return MsvcToolChain::readFromMap(data); }
+    bool canRestore(const QVariantMap &data) override;
+    ToolChain *restore(const QVariantMap &data) override
+    { return MsvcToolChain::readFromMap(data); }
 
     ToolChainConfigWidget *configurationWidget(ToolChain *);
     static QString vcVarsBatFor(const QString &basePath, const QString &toolchainName);
@@ -126,10 +126,10 @@ public:
     MsvcToolChainConfigWidget(ToolChain *);
 
 private:
-    void applyImpl() {}
-    void discardImpl() { setFromToolChain(); }
-    bool isDirtyImpl() const { return false; }
-    void makeReadOnlyImpl() {}
+    void applyImpl() override {}
+    void discardImpl() override { setFromToolChain(); }
+    bool isDirtyImpl() const override { return false; }
+    void makeReadOnlyImpl() override {}
 
     void setFromToolChain();
 
diff --git a/src/plugins/projectexplorer/wincetoolchain.h b/src/plugins/projectexplorer/wincetoolchain.h
index aa61ebfb1c4..b869905f32a 100644
--- a/src/plugins/projectexplorer/wincetoolchain.h
+++ b/src/plugins/projectexplorer/wincetoolchain.h
@@ -51,27 +51,28 @@ public:
                    const QString &libPath,
                    Detection d = ManualDetection);
 
-    QList<Utils::FileName> suggestedMkspecList() const;
+    QList<Utils::FileName> suggestedMkspecList() const override;
 
     static WinCEToolChain *readFromMap(const QVariantMap &data);
 
-    QString type() const;
-    QString typeDisplayName() const;
+    QString type() const override;
+    QString typeDisplayName() const override;
 
     QString ceVer() const;
 
-    QVariantMap toMap() const;
-    bool fromMap(const QVariantMap &data);
+    QVariantMap toMap() const override;
+    bool fromMap(const QVariantMap &data) override;
 
-    ToolChainConfigWidget *configurationWidget();
+    ToolChainConfigWidget *configurationWidget() override;
 
-    ToolChain *clone() const;
+    ToolChain *clone() const override;
 
     static QString autoDetectCdbDebugger(QStringList *checkedDirectories = 0);
 
-    bool operator ==(const ToolChain &other) const;
+    bool operator ==(const ToolChain &other) const override;
+
 protected:
-    Utils::Environment readEnvironmentSetting(Utils::Environment& env) const;
+    Utils::Environment readEnvironmentSetting(Utils::Environment& env) const override;
 
 private:
     WinCEToolChain();
@@ -94,10 +95,10 @@ public:
     WinCEToolChainConfigWidget(ToolChain *);
 
 private:
-    void applyImpl() {}
-    void discardImpl() { }
-    bool isDirtyImpl() const {return false;}
-    void makeReadOnlyImpl() {}
+    void applyImpl() override { }
+    void discardImpl() override { }
+    bool isDirtyImpl() const override { return false; }
+    void makeReadOnlyImpl() override { }
 };
 
 class WinCEToolChainFactory : public ToolChainFactory
@@ -107,10 +108,10 @@ class WinCEToolChainFactory : public ToolChainFactory
 public:
     WinCEToolChainFactory();
 
-    QList<ToolChain *> autoDetect();
+    QList<ToolChain *> autoDetect() override;
 
-    bool canRestore(const QVariantMap &data);
-    ToolChain *restore(const QVariantMap &data);
+    bool canRestore(const QVariantMap &data) override;
+    ToolChain *restore(const QVariantMap &data) override;
 
     ToolChainConfigWidget *configurationWidget(ToolChain *);
 
diff --git a/src/plugins/qnx/qnxtoolchain.h b/src/plugins/qnx/qnxtoolchain.h
index 88d59ae5d3c..1a76265c1a0 100644
--- a/src/plugins/qnx/qnxtoolchain.h
+++ b/src/plugins/qnx/qnxtoolchain.h
@@ -44,24 +44,24 @@ class QnxToolChain : public ProjectExplorer::GccToolChain
 public:
     explicit QnxToolChain(Detection d);
 
-    QString type() const;
-    QString typeDisplayName() const;
+    QString type() const override;
+    QString typeDisplayName() const override;
 
-    ProjectExplorer::ToolChainConfigWidget *configurationWidget();
+    ProjectExplorer::ToolChainConfigWidget *configurationWidget() override;
 
-    void addToEnvironment(Utils::Environment &env) const;
-    QList<Utils::FileName> suggestedMkspecList() const;
+    void addToEnvironment(Utils::Environment &env) const override;
+    QList<Utils::FileName> suggestedMkspecList() const override;
 
-    QVariantMap toMap() const;
-    bool fromMap(const QVariantMap &data);
+    QVariantMap toMap() const override;
+    bool fromMap(const QVariantMap &data) override;
 
     QString ndkPath() const;
     void setNdkPath(const QString &ndkPath);
 
 protected:
-    virtual QList<ProjectExplorer::Abi> detectSupportedAbis() const;
+    virtual QList<ProjectExplorer::Abi> detectSupportedAbis() const override;
 
-    QStringList reinterpretOptions(const QStringList &args) const;
+    QStringList reinterpretOptions(const QStringList &args) const override;
 
 private:
     QString m_ndkPath;
@@ -78,11 +78,11 @@ class QnxToolChainFactory : public ProjectExplorer::ToolChainFactory
 public:
     QnxToolChainFactory();
 
-    bool canRestore(const QVariantMap &data);
-    ProjectExplorer::ToolChain *restore(const QVariantMap &data);
+    bool canRestore(const QVariantMap &data) override;
+    ProjectExplorer::ToolChain *restore(const QVariantMap &data) override;
 
-    bool canCreate();
-    ProjectExplorer::ToolChain *create();
+    bool canCreate() override;
+    ProjectExplorer::ToolChain *create() override;
 };
 
 //----------------------------------------------------------------------------
@@ -97,10 +97,10 @@ public:
     QnxToolChainConfigWidget(QnxToolChain *tc);
 
 private:
-    void applyImpl();
-    void discardImpl();
-    bool isDirtyImpl() const;
-    void makeReadOnlyImpl() {}
+    void applyImpl() override;
+    void discardImpl() override;
+    bool isDirtyImpl() const override;
+    void makeReadOnlyImpl() override { }
 
     Utils::PathChooser *m_compilerCommand;
     Utils::PathChooser *m_ndkPath;