Add CM_OVERRIDE to some functions

Run clang-tidy's modernize-use-override checker.  This checker must have
issues in version 3.8.  It has way too little matches.  And it adds
override to destructors.  Revert the changes on the destructors and
change override to CM_OVERRIDE.

16 files changed, 146 insertions, 138 deletions

diff --git a/Source/CPack/IFW/cmCPackIFWRepository.cxx b/Source/CPack/IFW/cmCPackIFWRepository.cxx
index b8a10c6..e4fa569 100644
--- a/Source/CPack/IFW/cmCPackIFWRepository.cxx
+++ b/Source/CPack/IFW/cmCPackIFWRepository.cxx
@@ -177,7 +177,7 @@ public:
   bool patched;
 
 protected:
-  virtual void StartElement(const std::string& name, const char** atts)
+  void StartElement(const std::string& name, const char** atts) CM_OVERRIDE
   {
     xout.StartElement(name);
     StartFragment(atts);
@@ -192,7 +192,7 @@ protected:
     }
   }
 
-  virtual void EndElement(const std::string& name)
+  void EndElement(const std::string& name) CM_OVERRIDE
   {
     if (name == "Updates" && !patched) {
       repository->WriteRepositoryUpdates(xout);
@@ -208,7 +208,7 @@ protected:
     }
   }
 
-  virtual void CharacterDataHandler(const char* data, int length)
+  void CharacterDataHandler(const char* data, int length) CM_OVERRIDE
   {
     std::string content(data, data + length);
     if (content == "" || content == " " || content == "  " ||
diff --git a/Source/CTest/cmCTestBZR.cxx b/Source/CTest/cmCTestBZR.cxx
index 92eb570..5b3f612 100644
--- a/Source/CTest/cmCTestBZR.cxx
+++ b/Source/CTest/cmCTestBZR.cxx
@@ -101,7 +101,7 @@ private:
   bool CheckOutFound;
   cmsys::RegularExpression RegexCheckOut;
   cmsys::RegularExpression RegexParent;
-  virtual bool ProcessLine()
+  bool ProcessLine() CM_OVERRIDE
   {
     if (this->RegexCheckOut.find(this->Line)) {
       this->BZR->URL = this->RegexCheckOut.match(1);
@@ -126,7 +126,7 @@ public:
 private:
   std::string& Rev;
   cmsys::RegularExpression RegexRevno;
-  virtual bool ProcessLine()
+  bool ProcessLine() CM_OVERRIDE
   {
     if (this->RegexRevno.find(this->Line)) {
       this->Rev = this->RegexRevno.match(1);
@@ -185,7 +185,7 @@ public:
   }
   ~LogParser() { this->CleanupParser(); }
 
-  virtual int InitializeParser()
+  int InitializeParser() CM_OVERRIDE
   {
     int res = cmXMLParser::InitializeParser();
     if (res) {
@@ -207,14 +207,14 @@ private:
 
   cmsys::RegularExpression EmailRegex;
 
-  virtual bool ProcessChunk(const char* data, int length)
+  bool ProcessChunk(const char* data, int length) CM_OVERRIDE
   {
     this->OutputLogger::ProcessChunk(data, length);
     this->ParseChunk(data, length);
     return true;
   }
 
-  virtual void StartElement(const std::string& name, const char**)
+  void StartElement(const std::string& name, const char**) CM_OVERRIDE
   {
     this->CData.clear();
     if (name == "log") {
@@ -239,12 +239,12 @@ private:
     }
   }
 
-  virtual void CharacterDataHandler(const char* data, int length)
+  void CharacterDataHandler(const char* data, int length) CM_OVERRIDE
   {
     this->CData.insert(this->CData.end(), data, data + length);
   }
 
-  virtual void EndElement(const std::string& name)
+  void EndElement(const std::string& name) CM_OVERRIDE
   {
     if (name == "log") {
       this->BZR->DoRevision(this->Rev, this->Changes);
@@ -274,7 +274,7 @@ private:
     this->CData.clear();
   }
 
-  virtual void ReportError(int, int, const char* msg)
+  void ReportError(int, int, const char* msg) CM_OVERRIDE
   {
     this->BZR->Log << "Error parsing bzr log xml: " << msg << "\n";
   }
@@ -294,7 +294,7 @@ private:
   cmCTestBZR* BZR;
   cmsys::RegularExpression RegexUpdate;
 
-  virtual bool ProcessChunk(const char* first, int length)
+  bool ProcessChunk(const char* first, int length) CM_OVERRIDE
   {
     bool last_is_new_line = (*first == '\r' || *first == '\n');
 
@@ -325,7 +325,7 @@ private:
     return true;
   }
 
-  bool ProcessLine()
+  bool ProcessLine() CM_OVERRIDE
   {
     if (this->RegexUpdate.find(this->Line)) {
       this->DoPath(this->RegexUpdate.match(1)[0],
@@ -431,7 +431,7 @@ public:
 private:
   cmCTestBZR* BZR;
   cmsys::RegularExpression RegexStatus;
-  bool ProcessLine()
+  bool ProcessLine() CM_OVERRIDE
   {
     if (this->RegexStatus.find(this->Line)) {
       this->DoPath(this->RegexStatus.match(1)[0],
diff --git a/Source/CTest/cmCTestCVS.cxx b/Source/CTest/cmCTestCVS.cxx
index 5ddafbb..df19685 100644
--- a/Source/CTest/cmCTestCVS.cxx
+++ b/Source/CTest/cmCTestCVS.cxx
@@ -53,7 +53,7 @@ private:
   cmsys::RegularExpression RegexFileRemoved1;
   cmsys::RegularExpression RegexFileRemoved2;
 
-  virtual bool ProcessLine()
+  bool ProcessLine() CM_OVERRIDE
   {
     if (this->RegexFileUpdated.find(this->Line)) {
       this->DoFile(PathUpdated, this->RegexFileUpdated.match(2));
@@ -140,7 +140,7 @@ private:
   SectionType Section;
   Revision Rev;
 
-  virtual bool ProcessLine()
+  bool ProcessLine() CM_OVERRIDE
   {
     if (this->Line == ("======================================="
                        "======================================")) {
diff --git a/Source/CTest/cmCTestGIT.cxx b/Source/CTest/cmCTestGIT.cxx
index 8b392f2..36a781e 100644
--- a/Source/CTest/cmCTestGIT.cxx
+++ b/Source/CTest/cmCTestGIT.cxx
@@ -52,7 +52,7 @@ public:
 
 private:
   std::string& Line1;
-  virtual bool ProcessLine()
+  bool ProcessLine() CM_OVERRIDE
   {
     // Only the first line is of interest.
     this->Line1 = this->Line;
@@ -355,7 +355,7 @@ protected:
     this->Changes.clear();
   }
 
-  virtual bool ProcessLine()
+  bool ProcessLine() CM_OVERRIDE
   {
     if (this->Line[0] == ':') {
       this->DiffField = DiffFieldChange;
@@ -513,7 +513,7 @@ private:
     person.TimeZone = strtol(c, (char**)&c, 10);
   }
 
-  virtual bool ProcessLine()
+  bool ProcessLine() CM_OVERRIDE
   {
     if (this->Line.empty()) {
       if (this->Section == SectionBody && this->LineEnd == '\0') {
diff --git a/Source/CTest/cmCTestHG.cxx b/Source/CTest/cmCTestHG.cxx
index f1fe377..9589e05 100644
--- a/Source/CTest/cmCTestHG.cxx
+++ b/Source/CTest/cmCTestHG.cxx
@@ -41,7 +41,7 @@ private:
   std::string& Rev;
   cmsys::RegularExpression RegexIdentify;
 
-  bool ProcessLine()
+  bool ProcessLine() CM_OVERRIDE
   {
     if (this->RegexIdentify.find(this->Line)) {
       this->Rev = this->RegexIdentify.match(1);
@@ -65,7 +65,7 @@ private:
   cmCTestHG* HG;
   cmsys::RegularExpression RegexStatus;
 
-  bool ProcessLine()
+  bool ProcessLine() CM_OVERRIDE
   {
     if (this->RegexStatus.find(this->Line)) {
       this->DoPath(this->RegexStatus.match(1)[0], this->RegexStatus.match(2));
@@ -182,14 +182,14 @@ private:
   Change CurChange;
   std::vector<char> CData;
 
-  virtual bool ProcessChunk(const char* data, int length)
+  bool ProcessChunk(const char* data, int length) CM_OVERRIDE
   {
     this->OutputLogger::ProcessChunk(data, length);
     this->ParseChunk(data, length);
     return true;
   }
 
-  virtual void StartElement(const std::string& name, const char** atts)
+  void StartElement(const std::string& name, const char** atts) CM_OVERRIDE
   {
     this->CData.clear();
     if (name == "logentry") {
@@ -201,12 +201,12 @@ private:
     }
   }
 
-  virtual void CharacterDataHandler(const char* data, int length)
+  void CharacterDataHandler(const char* data, int length) CM_OVERRIDE
   {
     this->CData.insert(this->CData.end(), data, data + length);
   }
 
-  virtual void EndElement(const std::string& name)
+  void EndElement(const std::string& name) CM_OVERRIDE
   {
     if (name == "logentry") {
       this->HG->DoRevision(this->Rev, this->Changes);
@@ -261,7 +261,7 @@ private:
     return output;
   }
 
-  virtual void ReportError(int, int, const char* msg)
+  void ReportError(int, int, const char* msg) CM_OVERRIDE
   {
     this->HG->Log << "Error parsing hg log xml: " << msg << "\n";
   }
diff --git a/Source/CTest/cmCTestMemCheckHandler.cxx b/Source/CTest/cmCTestMemCheckHandler.cxx
index 5f70f66..6f1a2c4 100644
--- a/Source/CTest/cmCTestMemCheckHandler.cxx
+++ b/Source/CTest/cmCTestMemCheckHandler.cxx
@@ -61,7 +61,7 @@ public:
     this->CTest = c;
     this->SetErrorCallback(xmlReportError, (void*)c);
   }
-  void StartElement(const std::string& name, const char** atts)
+  void StartElement(const std::string& name, const char** atts) CM_OVERRIDE
   {
     if (name == "MemoryLeak" || name == "ResourceLeak") {
       this->Errors.push_back(cmCTestMemCheckHandler::MLK);
@@ -78,7 +78,7 @@ public:
     ostr << "\n";
     this->Log += ostr.str();
   }
-  void EndElement(const std::string&) {}
+  void EndElement(const std::string&) CM_OVERRIDE {}
 
   const char* GetAttribute(const char* name, const char** atts)
   {
diff --git a/Source/CTest/cmCTestP4.cxx b/Source/CTest/cmCTestP4.cxx
index ede11c9..072da29 100644
--- a/Source/CTest/cmCTestP4.cxx
+++ b/Source/CTest/cmCTestP4.cxx
@@ -45,7 +45,7 @@ private:
   std::string& Rev;
   cmsys::RegularExpression RegexIdentify;
 
-  bool ProcessLine()
+  bool ProcessLine() CM_OVERRIDE
   {
     if (this->RegexIdentify.find(this->Line)) {
       this->Rev = this->RegexIdentify.match(1);
@@ -69,7 +69,7 @@ private:
   cmsys::RegularExpression RegexIdentify;
   cmCTestP4* P4;
 
-  bool ProcessLine()
+  bool ProcessLine() CM_OVERRIDE
   {
     if (this->RegexIdentify.find(this->Line)) {
       P4->ChangeLists.push_back(this->RegexIdentify.match(1));
@@ -92,7 +92,7 @@ private:
   cmsys::RegularExpression RegexUser;
   cmCTestP4* P4;
 
-  bool ProcessLine()
+  bool ProcessLine() CM_OVERRIDE
   {
     if (this->RegexUser.find(this->Line)) {
       User NewUser;
@@ -135,7 +135,7 @@ private:
   std::string CurrentPath;
   cmsys::RegularExpression RegexDiff;
 
-  bool ProcessLine()
+  bool ProcessLine() CM_OVERRIDE
   {
     if (!this->Line.empty() && this->Line[0] == '=' &&
         this->RegexDiff.find(this->Line)) {
@@ -225,7 +225,7 @@ private:
   SectionType Section;
   Revision Rev;
 
-  virtual bool ProcessLine()
+  bool ProcessLine() CM_OVERRIDE
   {
     if (this->Line.empty()) {
       this->NextSection();
diff --git a/Source/CTest/cmCTestSVN.cxx b/Source/CTest/cmCTestSVN.cxx
index fa01411..074bd3d 100644
--- a/Source/CTest/cmCTestSVN.cxx
+++ b/Source/CTest/cmCTestSVN.cxx
@@ -62,7 +62,7 @@ private:
   cmsys::RegularExpression RegexRev;
   cmsys::RegularExpression RegexURL;
   cmsys::RegularExpression RegexRoot;
-  virtual bool ProcessLine()
+  bool ProcessLine() CM_OVERRIDE
   {
     if (this->RegexRev.find(this->Line)) {
       this->Rev = this->RegexRev.match(1);
@@ -206,7 +206,7 @@ private:
   cmCTestSVN* SVN;
   cmsys::RegularExpression RegexUpdate;
 
-  bool ProcessLine()
+  bool ProcessLine() CM_OVERRIDE
   {
     if (this->RegexUpdate.find(this->Line)) {
       this->DoPath(this->RegexUpdate.match(1)[0],
@@ -323,14 +323,14 @@ private:
   Change CurChange;
   std::vector<char> CData;
 
-  virtual bool ProcessChunk(const char* data, int length)
+  bool ProcessChunk(const char* data, int length) CM_OVERRIDE
   {
     this->OutputLogger::ProcessChunk(data, length);
     this->ParseChunk(data, length);
     return true;
   }
 
-  virtual void StartElement(const std::string& name, const char** atts)
+  void StartElement(const std::string& name, const char** atts) CM_OVERRIDE
   {
     this->CData.clear();
     if (name == "logentry") {
@@ -348,12 +348,12 @@ private:
     }
   }
 
-  virtual void CharacterDataHandler(const char* data, int length)
+  void CharacterDataHandler(const char* data, int length) CM_OVERRIDE
   {
     this->CData.insert(this->CData.end(), data, data + length);
   }
 
-  virtual void EndElement(const std::string& name)
+  void EndElement(const std::string& name) CM_OVERRIDE
   {
     if (name == "logentry") {
       this->SVN->DoRevisionSVN(this->Rev, this->Changes);
@@ -372,7 +372,7 @@ private:
     this->CData.clear();
   }
 
-  virtual void ReportError(int, int, const char* msg)
+  void ReportError(int, int, const char* msg) CM_OVERRIDE
   {
     this->SVN->Log << "Error parsing svn log xml: " << msg << "\n";
   }
@@ -441,7 +441,7 @@ public:
 private:
   cmCTestSVN* SVN;
   cmsys::RegularExpression RegexStatus;
-  bool ProcessLine()
+  bool ProcessLine() CM_OVERRIDE
   {
     if (this->RegexStatus.find(this->Line)) {
       this->DoPath(this->RegexStatus.match(1)[0],
@@ -506,7 +506,7 @@ public:
 private:
   cmCTestSVN* SVN;
   cmsys::RegularExpression RegexExternal;
-  bool ProcessLine()
+  bool ProcessLine() CM_OVERRIDE
   {
     if (this->RegexExternal.find(this->Line)) {
       this->DoPath(this->RegexExternal.match(1));
diff --git a/Source/CTest/cmCTestScriptHandler.cxx b/Source/CTest/cmCTestScriptHandler.cxx
index 6389a9d..028cfdd 100644
--- a/Source/CTest/cmCTestScriptHandler.cxx
+++ b/Source/CTest/cmCTestScriptHandler.cxx
@@ -60,8 +60,8 @@ class cmCTestScriptFunctionBlocker : public cmFunctionBlocker
 public:
   cmCTestScriptFunctionBlocker() {}
   virtual ~cmCTestScriptFunctionBlocker() {}
-  virtual bool IsFunctionBlocked(const cmListFileFunction& lff, cmMakefile& mf,
-                                 cmExecutionStatus&);
+  bool IsFunctionBlocked(const cmListFileFunction& lff, cmMakefile& mf,
+                         cmExecutionStatus&) CM_OVERRIDE;
   // virtual bool ShouldRemove(const cmListFileFunction& lff, cmMakefile &mf);
   // virtual void ScopeEnded(cmMakefile &mf);
 
diff --git a/Source/CTest/cmCTestSubmitHandler.cxx b/Source/CTest/cmCTestSubmitHandler.cxx
index 69f2ac5..85e243f 100644
--- a/Source/CTest/cmCTestSubmitHandler.cxx
+++ b/Source/CTest/cmCTestSubmitHandler.cxx
@@ -69,7 +69,7 @@ private:
     return val;
   }
 
-  virtual void StartElement(const std::string& name, const char** atts)
+  void StartElement(const std::string& name, const char** atts) CM_OVERRIDE
   {
     this->CurrentValue.clear();
     if (name == "cdash") {
@@ -77,12 +77,12 @@ private:
     }
   }
 
-  virtual void CharacterDataHandler(const char* data, int length)
+  void CharacterDataHandler(const char* data, int length) CM_OVERRIDE
   {
     this->CurrentValue.insert(this->CurrentValue.end(), data, data + length);
   }
 
-  virtual void EndElement(const std::string& name)
+  void EndElement(const std::string& name) CM_OVERRIDE
   {
     if (name == "status") {
       std::string status = cmSystemTools::UpperCase(this->GetCurrentValue());
diff --git a/Source/CTest/cmCTestTestHandler.cxx b/Source/CTest/cmCTestTestHandler.cxx
index c991a23..3ee9c5f 100644
--- a/Source/CTest/cmCTestTestHandler.cxx
+++ b/Source/CTest/cmCTestTestHandler.cxx
@@ -42,7 +42,7 @@ public:
   /**
    * This is a virtual constructor for the command.
    */
-  virtual cmCommand* Clone()
+  cmCommand* Clone() CM_OVERRIDE
   {
     cmCTestSubdirCommand* c = new cmCTestSubdirCommand;
     c->TestHandler = this->TestHandler;
@@ -53,13 +53,13 @@ public:
    * This is called when the command is first encountered in
    * the CMakeLists.txt file.
    */
-  virtual bool InitialPass(std::vector<std::string> const& args,
-                           cmExecutionStatus&);
+  bool InitialPass(std::vector<std::string> const& args,
+                   cmExecutionStatus&) CM_OVERRIDE;
 
   /**
    * The name of the command as specified in CMakeList.txt.
    */
-  virtual std::string GetName() const { return "subdirs"; }
+  std::string GetName() const CM_OVERRIDE { return "subdirs"; }
 
   cmTypeMacro(cmCTestSubdirCommand, cmCommand);
 
@@ -123,7 +123,7 @@ public:
   /**
    * This is a virtual constructor for the command.
    */
-  virtual cmCommand* Clone()
+  cmCommand* Clone() CM_OVERRIDE
   {
     cmCTestAddSubdirectoryCommand* c = new cmCTestAddSubdirectoryCommand;
     c->TestHandler = this->TestHandler;
@@ -134,13 +134,13 @@ public:
    * This is called when the command is first encountered in
    * the CMakeLists.txt file.
    */
-  virtual bool InitialPass(std::vector<std::string> const& args,
-                           cmExecutionStatus&);
+  bool InitialPass(std::vector<std::string> const& args,
+                   cmExecutionStatus&) CM_OVERRIDE;
 
   /**
    * The name of the command as specified in CMakeList.txt.
    */
-  virtual std::string GetName() const { return "add_subdirectory"; }
+  std::string GetName() const CM_OVERRIDE { return "add_subdirectory"; }
 
   cmTypeMacro(cmCTestAddSubdirectoryCommand, cmCommand);
 
@@ -197,7 +197,7 @@ public:
   /**
    * This is a virtual constructor for the command.
    */
-  virtual cmCommand* Clone()
+  cmCommand* Clone() CM_OVERRIDE
   {
     cmCTestAddTestCommand* c = new cmCTestAddTestCommand;
     c->TestHandler = this->TestHandler;
@@ -208,13 +208,13 @@ public:
    * This is called when the command is first encountered in
    * the CMakeLists.txt file.
    */
-  virtual bool InitialPass(std::vector<std::string> const&,
-                           cmExecutionStatus&);
+  bool InitialPass(std::vector<std::string> const&,
+                   cmExecutionStatus&) CM_OVERRIDE;
 
   /**
    * The name of the command as specified in CMakeList.txt.
    */
-  virtual std::string GetName() const { return "add_test"; }
+  std::string GetName() const CM_OVERRIDE { return "add_test"; }
 
   cmTypeMacro(cmCTestAddTestCommand, cmCommand);
 
@@ -237,7 +237,7 @@ public:
   /**
    * This is a virtual constructor for the command.
    */
-  virtual cmCommand* Clone()
+  cmCommand* Clone() CM_OVERRIDE
   {
     cmCTestSetTestsPropertiesCommand* c = new cmCTestSetTestsPropertiesCommand;
     c->TestHandler = this->TestHandler;
@@ -248,13 +248,13 @@ public:
    * This is called when the command is first encountered in
    * the CMakeLists.txt file.
   */
-  virtual bool InitialPass(std::vector<std::string> const&,
-                           cmExecutionStatus&);
+  bool InitialPass(std::vector<std::string> const&,
+                   cmExecutionStatus&) CM_OVERRIDE;
 
   /**
    * The name of the command as specified in CMakeList.txt.
    */
-  virtual std::string GetName() const { return "set_tests_properties"; }
+  std::string GetName() const CM_OVERRIDE { return "set_tests_properties"; }
 
   cmTypeMacro(cmCTestSetTestsPropertiesCommand, cmCommand);
 
diff --git a/Source/CTest/cmParseCoberturaCoverage.cxx b/Source/CTest/cmParseCoberturaCoverage.cxx
index 3bdae17..f1c37ed 100644
--- a/Source/CTest/cmParseCoberturaCoverage.cxx
+++ b/Source/CTest/cmParseCoberturaCoverage.cxx
@@ -23,7 +23,7 @@ public:
   virtual ~XMLParser() {}
 
 protected:
-  virtual void EndElement(const std::string& name)
+  void EndElement(const std::string& name) CM_OVERRIDE
   {
     if (name == "source") {
       this->InSource = false;
@@ -34,7 +34,7 @@ protected:
     }
   }
 
-  virtual void CharacterDataHandler(const char* data, int length)
+  void CharacterDataHandler(const char* data, int length) CM_OVERRIDE
   {
     std::string tmp;
     tmp.insert(0, data, length);
@@ -46,7 +46,7 @@ protected:
     }
   }
 
-  virtual void StartElement(const std::string& name, const char** atts)
+  void StartElement(const std::string& name, const char** atts) CM_OVERRIDE
   {
     std::string FoundSource;
     std::string finalpath = "";
diff --git a/Source/CTest/cmParseJacocoCoverage.cxx b/Source/CTest/cmParseJacocoCoverage.cxx
index e456f39..27ccf58 100644
--- a/Source/CTest/cmParseJacocoCoverage.cxx
+++ b/Source/CTest/cmParseJacocoCoverage.cxx
@@ -23,9 +23,9 @@ public:
   virtual ~XMLParser() {}
 
 protected:
-  virtual void EndElement(const std::string&) {}
+  void EndElement(const std::string&) CM_OVERRIDE {}
 
-  virtual void StartElement(const std::string& name, const char** atts)
+  void StartElement(const std::string& name, const char** atts) CM_OVERRIDE
   {
     if (name == "package") {
       this->PackageName = atts[1];
diff --git a/Source/cmELF.cxx b/Source/cmELF.cxx
index c7f8a2d..16294ea 100644
--- a/Source/cmELF.cxx
+++ b/Source/cmELF.cxx
@@ -241,20 +241,20 @@ public:
                     ByteOrderType order);
 
   // Return the number of sections as specified by the ELF header.
-  virtual unsigned int GetNumberOfSections() const
+  unsigned int GetNumberOfSections() const CM_OVERRIDE
   {
     return static_cast<unsigned int>(this->ELFHeader.e_shnum);
   }
 
   // Get the file position and size of a dynamic section entry.
-  virtual unsigned int GetDynamicEntryCount();
-  virtual unsigned long GetDynamicEntryPosition(int j);
+  unsigned int GetDynamicEntryCount() CM_OVERRIDE;
+  unsigned long GetDynamicEntryPosition(int j) CM_OVERRIDE;
 
   // Lookup a string from the dynamic section with the given tag.
-  virtual StringEntry const* GetDynamicSectionString(unsigned int tag);
+  StringEntry const* GetDynamicSectionString(unsigned int tag) CM_OVERRIDE;
 
   // Print information about the ELF file.
-  virtual void PrintInfo(std::ostream& os) const
+  void PrintInfo(std::ostream& os) const CM_OVERRIDE
   {
     os << "ELF " << Types::GetName();
     if (this->ByteOrder == ByteOrderMSB) {
diff --git a/Source/cmGeneratorExpressionNode.cxx b/Source/cmGeneratorExpressionNode.cxx
index e750551..599ea8d 100644
--- a/Source/cmGeneratorExpressionNode.cxx
+++ b/Source/cmGeneratorExpressionNode.cxx
@@ -42,14 +42,14 @@ static const struct ZeroNode : public cmGeneratorExpressionNode
 {
   ZeroNode() {}
 
-  virtual bool GeneratesContent() const { return false; }
+  bool GeneratesContent() const CM_OVERRIDE { return false; }
 
-  virtual bool AcceptsArbitraryContentParameter() const { return true; }
+  bool AcceptsArbitraryContentParameter() const CM_OVERRIDE { return true; }
 
   std::string Evaluate(const std::vector<std::string>&,
                        cmGeneratorExpressionContext*,
                        const GeneratorExpressionContent*,
-                       cmGeneratorExpressionDAGChecker*) const
+                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
   {
     return std::string();
   }
@@ -59,12 +59,12 @@ static const struct OneNode : public cmGeneratorExpressionNode
 {
   OneNode() {}
 
-  virtual bool AcceptsArbitraryContentParameter() const { return true; }
+  bool AcceptsArbitraryContentParameter() const CM_OVERRIDE { return true; }
 
   std::string Evaluate(const std::vector<std::string>& parameters,
                        cmGeneratorExpressionContext*,
                        const GeneratorExpressionContent*,
-                       cmGeneratorExpressionDAGChecker*) const
+                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
   {
     return parameters.front();
   }
@@ -113,7 +113,7 @@ static const struct NotNode : public cmGeneratorExpressionNode
   std::string Evaluate(const std::vector<std::string>& parameters,
                        cmGeneratorExpressionContext* context,
                        const GeneratorExpressionContent* content,
-                       cmGeneratorExpressionDAGChecker*) const
+                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
   {
     if (*parameters.begin() != "0" && *parameters.begin() != "1") {
       reportError(
@@ -129,12 +129,12 @@ static const struct BoolNode : public cmGeneratorExpressionNode
 {
   BoolNode() {}
 
-  virtual int NumExpectedParameters() const { return 1; }
+  int NumExpectedParameters() const CM_OVERRIDE { return 1; }
 
   std::string Evaluate(const std::vector<std::string>& parameters,
                        cmGeneratorExpressionContext*,
                        const GeneratorExpressionContent*,
-                       cmGeneratorExpressionDAGChecker*) const
+                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
   {
     return !cmSystemTools::IsOff(parameters.begin()->c_str()) ? "1" : "0";
   }
@@ -144,12 +144,12 @@ static const struct StrEqualNode : public cmGeneratorExpressionNode
 {
   StrEqualNode() {}
 
-  virtual int NumExpectedParameters() const { return 2; }
+  int NumExpectedParameters() const CM_OVERRIDE { return 2; }
 
   std::string Evaluate(const std::vector<std::string>& parameters,
                        cmGeneratorExpressionContext*,
                        const GeneratorExpressionContent*,
-                       cmGeneratorExpressionDAGChecker*) const
+                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
   {
     return *parameters.begin() == parameters[1] ? "1" : "0";
   }
@@ -159,12 +159,12 @@ static const struct EqualNode : public cmGeneratorExpressionNode
 {
   EqualNode() {}
 
-  virtual int NumExpectedParameters() const { return 2; }
+  int NumExpectedParameters() const CM_OVERRIDE { return 2; }
 
   std::string Evaluate(const std::vector<std::string>& parameters,
                        cmGeneratorExpressionContext* context,
                        const GeneratorExpressionContent* content,
-                       cmGeneratorExpressionDAGChecker*) const
+                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
   {
     char* pEnd;
 
@@ -236,12 +236,12 @@ static const struct LowerCaseNode : public cmGeneratorExpressionNode
 {
   LowerCaseNode() {}
 
-  bool AcceptsArbitraryContentParameter() const { return true; }
+  bool AcceptsArbitraryContentParameter() const CM_OVERRIDE { return true; }
 
   std::string Evaluate(const std::vector<std::string>& parameters,
                        cmGeneratorExpressionContext*,
                        const GeneratorExpressionContent*,
-                       cmGeneratorExpressionDAGChecker*) const
+                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
   {
     return cmSystemTools::LowerCase(parameters.front());
   }
@@ -251,12 +251,12 @@ static const struct UpperCaseNode : public cmGeneratorExpressionNode
 {
   UpperCaseNode() {}
 
-  bool AcceptsArbitraryContentParameter() const { return true; }
+  bool AcceptsArbitraryContentParameter() const CM_OVERRIDE { return true; }
 
   std::string Evaluate(const std::vector<std::string>& parameters,
                        cmGeneratorExpressionContext*,
                        const GeneratorExpressionContent*,
-                       cmGeneratorExpressionDAGChecker*) const
+                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
   {
     return cmSystemTools::UpperCase(parameters.front());
   }
@@ -266,12 +266,12 @@ static const struct MakeCIdentifierNode : public cmGeneratorExpressionNode
 {
   MakeCIdentifierNode() {}
 
-  bool AcceptsArbitraryContentParameter() const { return true; }
+  bool AcceptsArbitraryContentParameter() const CM_OVERRIDE { return true; }
 
   std::string Evaluate(const std::vector<std::string>& parameters,
                        cmGeneratorExpressionContext*,
                        const GeneratorExpressionContent*,
-                       cmGeneratorExpressionDAGChecker*) const
+                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
   {
     return cmSystemTools::MakeCidentifier(parameters.front());
   }
@@ -281,12 +281,12 @@ static const struct Angle_RNode : public cmGeneratorExpressionNode
 {
   Angle_RNode() {}
 
-  virtual int NumExpectedParameters() const { return 0; }
+  int NumExpectedParameters() const CM_OVERRIDE { return 0; }
 
   std::string Evaluate(const std::vector<std::string>&,
                        cmGeneratorExpressionContext*,
                        const GeneratorExpressionContent*,
-                       cmGeneratorExpressionDAGChecker*) const
+                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
   {
     return ">";
   }
@@ -296,12 +296,12 @@ static const struct CommaNode : public cmGeneratorExpressionNode
 {
   CommaNode() {}
 
-  virtual int NumExpectedParameters() const { return 0; }
+  int NumExpectedParameters() const CM_OVERRIDE { return 0; }
 
   std::string Evaluate(const std::vector<std::string>&,
                        cmGeneratorExpressionContext*,
                        const GeneratorExpressionContent*,
-                       cmGeneratorExpressionDAGChecker*) const
+                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
   {
     return ",";
   }
@@ -311,12 +311,12 @@ static const struct SemicolonNode : public cmGeneratorExpressionNode
 {
   SemicolonNode() {}
 
-  virtual int NumExpectedParameters() const { return 0; }
+  int NumExpectedParameters() const CM_OVERRIDE { return 0; }
 
   std::string Evaluate(const std::vector<std::string>&,
                        cmGeneratorExpressionContext*,
                        const GeneratorExpressionContent*,
-                       cmGeneratorExpressionDAGChecker*) const
+                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
   {
     return ";";
   }
@@ -326,7 +326,7 @@ struct CompilerIdNode : public cmGeneratorExpressionNode
 {
   CompilerIdNode() {}
 
-  virtual int NumExpectedParameters() const { return OneOrZeroParameters; }
+  int NumExpectedParameters() const CM_OVERRIDE { return OneOrZeroParameters; }
 
   std::string EvaluateWithLanguage(const std::vector<std::string>& parameters,
                                    cmGeneratorExpressionContext* context,
@@ -381,6 +381,7 @@ static const struct CCompilerIdNode : public CompilerIdNode
                        cmGeneratorExpressionContext* context,
                        const GeneratorExpressionContent* content,
                        cmGeneratorExpressionDAGChecker* dagChecker) const
+    CM_OVERRIDE
   {
     if (!context->HeadTarget) {
       reportError(
@@ -402,6 +403,7 @@ static const struct CXXCompilerIdNode : public CompilerIdNode
                        cmGeneratorExpressionContext* context,
                        const GeneratorExpressionContent* content,
                        cmGeneratorExpressionDAGChecker* dagChecker) const
+    CM_OVERRIDE
   {
     if (!context->HeadTarget) {
       reportError(
@@ -419,7 +421,7 @@ struct CompilerVersionNode : public cmGeneratorExpressionNode
 {
   CompilerVersionNode() {}
 
-  virtual int NumExpectedParameters() const { return OneOrZeroParameters; }
+  int NumExpectedParameters() const CM_OVERRIDE { return OneOrZeroParameters; }
 
   std::string EvaluateWithLanguage(const std::vector<std::string>& parameters,
                                    cmGeneratorExpressionContext* context,
@@ -460,6 +462,7 @@ static const struct CCompilerVersionNode : public CompilerVersionNode
                        cmGeneratorExpressionContext* context,
                        const GeneratorExpressionContent* content,
                        cmGeneratorExpressionDAGChecker* dagChecker) const
+    CM_OVERRIDE
   {
     if (!context->HeadTarget) {
       reportError(
@@ -481,6 +484,7 @@ static const struct CxxCompilerVersionNode : public CompilerVersionNode
                        cmGeneratorExpressionContext* context,
                        const GeneratorExpressionContent* content,
                        cmGeneratorExpressionDAGChecker* dagChecker) const
+    CM_OVERRIDE
   {
     if (!context->HeadTarget) {
       reportError(
@@ -498,12 +502,12 @@ struct PlatformIdNode : public cmGeneratorExpressionNode
 {
   PlatformIdNode() {}
 
-  virtual int NumExpectedParameters() const { return OneOrZeroParameters; }
+  int NumExpectedParameters() const CM_OVERRIDE { return OneOrZeroParameters; }
 
   std::string Evaluate(const std::vector<std::string>& parameters,
                        cmGeneratorExpressionContext* context,
                        const GeneratorExpressionContent*,
-                       cmGeneratorExpressionDAGChecker*) const
+                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
   {
     const char* platformId =
       context->LG->GetMakefile()->GetSafeDefinition("CMAKE_SYSTEM_NAME");
@@ -526,12 +530,12 @@ static const struct VersionGreaterNode : public cmGeneratorExpressionNode
 {
   VersionGreaterNode() {}
 
-  virtual int NumExpectedParameters() const { return 2; }
+  int NumExpectedParameters() const CM_OVERRIDE { return 2; }
 
   std::string Evaluate(const std::vector<std::string>& parameters,
                        cmGeneratorExpressionContext*,
                        const GeneratorExpressionContent*,
-                       cmGeneratorExpressionDAGChecker*) const
+                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
   {
     return cmSystemTools::VersionCompare(cmSystemTools::OP_GREATER,
                                          parameters.front().c_str(),
@@ -545,12 +549,12 @@ static const struct VersionLessNode : public cmGeneratorExpressionNode
 {
   VersionLessNode() {}
 
-  virtual int NumExpectedParameters() const { return 2; }
+  int NumExpectedParameters() const CM_OVERRIDE { return 2; }
 
   std::string Evaluate(const std::vector<std::string>& parameters,
                        cmGeneratorExpressionContext*,
                        const GeneratorExpressionContent*,
-                       cmGeneratorExpressionDAGChecker*) const
+                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
   {
     return cmSystemTools::VersionCompare(cmSystemTools::OP_LESS,
                                          parameters.front().c_str(),
@@ -564,12 +568,12 @@ static const struct VersionEqualNode : public cmGeneratorExpressionNode
 {
   VersionEqualNode() {}
 
-  virtual int NumExpectedParameters() const { return 2; }
+  int NumExpectedParameters() const CM_OVERRIDE { return 2; }
 
   std::string Evaluate(const std::vector<std::string>& parameters,
                        cmGeneratorExpressionContext*,
                        const GeneratorExpressionContent*,
-                       cmGeneratorExpressionDAGChecker*) const
+                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
   {
     return cmSystemTools::VersionCompare(cmSystemTools::OP_EQUAL,
                                          parameters.front().c_str(),
@@ -583,10 +587,10 @@ static const struct LinkOnlyNode : public cmGeneratorExpressionNode
 {
   LinkOnlyNode() {}
 
-  std::string Evaluate(const std::vector<std::string>& parameters,
-                       cmGeneratorExpressionContext*,
-                       const GeneratorExpressionContent*,
-                       cmGeneratorExpressionDAGChecker* dagChecker) const
+  std::string Evaluate(
+    const std::vector<std::string>& parameters, cmGeneratorExpressionContext*,
+    const GeneratorExpressionContent*,
+    cmGeneratorExpressionDAGChecker* dagChecker) const CM_OVERRIDE
   {
     if (!dagChecker->GetTransitivePropertiesOnly()) {
       return parameters.front();
@@ -599,12 +603,12 @@ static const struct ConfigurationNode : public cmGeneratorExpressionNode
 {
   ConfigurationNode() {}
 
-  virtual int NumExpectedParameters() const { return 0; }
+  int NumExpectedParameters() const CM_OVERRIDE { return 0; }
 
   std::string Evaluate(const std::vector<std::string>&,
                        cmGeneratorExpressionContext* context,
                        const GeneratorExpressionContent*,
-                       cmGeneratorExpressionDAGChecker*) const
+                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
   {
     context->HadContextSensitiveCondition = true;
     return context->Config;
@@ -615,12 +619,12 @@ static const struct ConfigurationTestNode : public cmGeneratorExpressionNode
 {
   ConfigurationTestNode() {}
 
-  virtual int NumExpectedParameters() const { return OneOrZeroParameters; }
+  int NumExpectedParameters() const CM_OVERRIDE { return OneOrZeroParameters; }
 
   std::string Evaluate(const std::vector<std::string>& parameters,
                        cmGeneratorExpressionContext* context,
                        const GeneratorExpressionContent* content,
-                       cmGeneratorExpressionDAGChecker*) const
+                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
   {
     if (parameters.empty()) {
       return configurationNode.Evaluate(parameters, context, content, 0);
@@ -673,14 +677,14 @@ static const struct JoinNode : public cmGeneratorExpressionNode
 {
   JoinNode() {}
 
-  virtual int NumExpectedParameters() const { return 2; }
+  int NumExpectedParameters() const CM_OVERRIDE { return 2; }
 
-  virtual bool AcceptsArbitraryContentParameter() const { return true; }
+  bool AcceptsArbitraryContentParameter() const CM_OVERRIDE { return true; }
 
   std::string Evaluate(const std::vector<std::string>& parameters,
                        cmGeneratorExpressionContext*,
                        const GeneratorExpressionContent*,
-                       cmGeneratorExpressionDAGChecker*) const
+                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
   {
     std::vector<std::string> list;
     cmSystemTools::ExpandListArgument(parameters.front(), list);
@@ -692,12 +696,13 @@ static const struct CompileLanguageNode : public cmGeneratorExpressionNode
 {
   CompileLanguageNode() {}
 
-  virtual int NumExpectedParameters() const { return OneOrZeroParameters; }
+  int NumExpectedParameters() const CM_OVERRIDE { return OneOrZeroParameters; }
 
   std::string Evaluate(const std::vector<std::string>& parameters,
                        cmGeneratorExpressionContext* context,
                        const GeneratorExpressionContent* content,
                        cmGeneratorExpressionDAGChecker* dagChecker) const
+    CM_OVERRIDE
   {
     if (context->Language.empty()) {
       reportError(
@@ -795,12 +800,13 @@ static const struct TargetPropertyNode : public cmGeneratorExpressionNode
   TargetPropertyNode() {}
 
   // This node handles errors on parameter count itself.
-  virtual int NumExpectedParameters() const { return OneOrMoreParameters; }
+  int NumExpectedParameters() const CM_OVERRIDE { return OneOrMoreParameters; }
 
   std::string Evaluate(const std::vector<std::string>& parameters,
                        cmGeneratorExpressionContext* context,
                        const GeneratorExpressionContent* content,
                        cmGeneratorExpressionDAGChecker* dagCheckerParent) const
+    CM_OVERRIDE
   {
     if (parameters.size() != 1 && parameters.size() != 2) {
       reportError(
@@ -1087,20 +1093,20 @@ static const struct TargetNameNode : public cmGeneratorExpressionNode
 {
   TargetNameNode() {}
 
-  virtual bool GeneratesContent() const { return true; }
+  bool GeneratesContent() const CM_OVERRIDE { return true; }
 
-  virtual bool AcceptsArbitraryContentParameter() const { return true; }
-  virtual bool RequiresLiteralInput() const { return true; }
+  bool AcceptsArbitraryContentParameter() const CM_OVERRIDE { return true; }
+  bool RequiresLiteralInput() const CM_OVERRIDE { return true; }
 
   std::string Evaluate(const std::vector<std::string>& parameters,
                        cmGeneratorExpressionContext*,
                        const GeneratorExpressionContent*,
-                       cmGeneratorExpressionDAGChecker*) const
+                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
   {
     return parameters.front();
   }
 
-  virtual int NumExpectedParameters() const { return 1; }
+  int NumExpectedParameters() const CM_OVERRIDE { return 1; }
 
 } targetNameNode;
 
@@ -1111,7 +1117,7 @@ static const struct TargetObjectsNode : public cmGeneratorExpressionNode
   std::string Evaluate(const std::vector<std::string>& parameters,
                        cmGeneratorExpressionContext* context,
                        const GeneratorExpressionContent* content,
-                       cmGeneratorExpressionDAGChecker*) const
+                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
   {
     if (!context->EvaluateForBuildsystem) {
       std::ostringstream e;
@@ -1179,12 +1185,13 @@ static const struct CompileFeaturesNode : public cmGeneratorExpressionNode
 {
   CompileFeaturesNode() {}
 
-  virtual int NumExpectedParameters() const { return OneOrMoreParameters; }
+  int NumExpectedParameters() const CM_OVERRIDE { return OneOrMoreParameters; }
 
   std::string Evaluate(const std::vector<std::string>& parameters,
                        cmGeneratorExpressionContext* context,
                        const GeneratorExpressionContent* content,
                        cmGeneratorExpressionDAGChecker* dagChecker) const
+    CM_OVERRIDE
   {
     cmGeneratorTarget const* target = context->HeadTarget;
     if (!target) {
@@ -1306,12 +1313,12 @@ static const struct TargetPolicyNode : public cmGeneratorExpressionNode
 {
   TargetPolicyNode() {}
 
-  virtual int NumExpectedParameters() const { return 1; }
+  int NumExpectedParameters() const CM_OVERRIDE { return 1; }
 
   std::string Evaluate(const std::vector<std::string>& parameters,
                        cmGeneratorExpressionContext* context,
                        const GeneratorExpressionContent* content,
-                       cmGeneratorExpressionDAGChecker*) const
+                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
   {
     if (!context->HeadTarget) {
       reportError(
@@ -1365,13 +1372,13 @@ static const struct InstallPrefixNode : public cmGeneratorExpressionNode
 {
   InstallPrefixNode() {}
 
-  virtual bool GeneratesContent() const { return true; }
-  virtual int NumExpectedParameters() const { return 0; }
+  bool GeneratesContent() const CM_OVERRIDE { return true; }
+  int NumExpectedParameters() const CM_OVERRIDE { return 0; }
 
   std::string Evaluate(const std::vector<std::string>&,
                        cmGeneratorExpressionContext* context,
                        const GeneratorExpressionContent* content,
-                       cmGeneratorExpressionDAGChecker*) const
+                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
   {
     reportError(context, content->GetOriginalExpression(),
                 "INSTALL_PREFIX is a marker for install(EXPORT) only.  It "
@@ -1529,12 +1536,13 @@ struct TargetFilesystemArtifact : public cmGeneratorExpressionNode
 {
   TargetFilesystemArtifact() {}
 
-  virtual int NumExpectedParameters() const { return 1; }
+  int NumExpectedParameters() const CM_OVERRIDE { return 1; }
 
   std::string Evaluate(const std::vector<std::string>& parameters,
                        cmGeneratorExpressionContext* context,
                        const GeneratorExpressionContent* content,
                        cmGeneratorExpressionDAGChecker* dagChecker) const
+    CM_OVERRIDE
   {
     // Lookup the referenced target.
     std::string name = *parameters.begin();
@@ -1606,7 +1614,7 @@ static const struct ShellPathNode : public cmGeneratorExpressionNode
   std::string Evaluate(const std::vector<std::string>& parameters,
                        cmGeneratorExpressionContext* context,
                        const GeneratorExpressionContent* content,
-                       cmGeneratorExpressionDAGChecker*) const
+                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
   {
     if (!cmSystemTools::FileIsFullPath(parameters.front())) {
       reportError(context, content->GetOriginalExpression(),
diff --git a/Source/cmOrderDirectories.cxx b/Source/cmOrderDirectories.cxx
index 00606c7..20f2246 100644
--- a/Source/cmOrderDirectories.cxx
+++ b/Source/cmOrderDirectories.cxx
@@ -157,7 +157,7 @@ public:
     }
   }
 
-  virtual void Report(std::ostream& e)
+  void Report(std::ostream& e) CM_OVERRIDE
   {
     e << "runtime library [";
     if (this->SOName.empty()) {
@@ -168,7 +168,7 @@ public:
     e << "]";
   }
 
-  virtual bool FindConflict(std::string const& dir);
+  bool FindConflict(std::string const& dir) CM_OVERRIDE;
 
 private:
   // The soname of the shared library if it is known.
@@ -212,12 +212,12 @@ public:
   {
   }
 
-  virtual void Report(std::ostream& e)
+  void Report(std::ostream& e) CM_OVERRIDE
   {
     e << "link library [" << this->FileName << "]";
   }
 
-  virtual bool FindConflict(std::string const& dir);
+  bool FindConflict(std::string const& dir) CM_OVERRIDE;
 };
 
 bool cmOrderDirectoriesConstraintLibrary::FindConflict(std::string const& dir)