diff --git a/Source/CPack/cmCPackArchiveGenerator.cxx b/Source/CPack/cmCPackArchiveGenerator.cxx
index b1f686468..9120a2f45 100644
--- a/Source/CPack/cmCPackArchiveGenerator.cxx
+++ b/Source/CPack/cmCPackArchiveGenerator.cxx
@@ -259,7 +259,7 @@ int cmCPackArchiveGenerator::PackageFiles()
   return 1;
 }
 
-int cmCPackArchiveGenerator::GenerateHeader(std::ostream*)
+int cmCPackArchiveGenerator::GenerateHeader(std::ostream* /*unused*/)
 {
   return 1;
 }
diff --git a/Source/CPack/cpack.cxx b/Source/CPack/cpack.cxx
index 771519c91..de572c089 100644
--- a/Source/CPack/cpack.cxx
+++ b/Source/CPack/cpack.cxx
@@ -50,7 +50,7 @@ static const char* cmDocumentationOptions[][2] = {
   { CM_NULLPTR, CM_NULLPTR }
 };
 
-int cpackUnknownArgument(const char*, void*)
+int cpackUnknownArgument(const char* /*unused*/, void* /*unused*/)
 {
   return 1;
 }
diff --git a/Source/CTest/cmCTestBZR.cxx b/Source/CTest/cmCTestBZR.cxx
index 0e08e1c0f..7baf7a35b 100644
--- a/Source/CTest/cmCTestBZR.cxx
+++ b/Source/CTest/cmCTestBZR.cxx
@@ -19,7 +19,7 @@
 
 #include <cm_expat.h>
 
-extern "C" int cmBZRXMLParserUnknownEncodingHandler(void*,
+extern "C" int cmBZRXMLParserUnknownEncodingHandler(void* /*unused*/,
                                                     const XML_Char* name,
                                                     XML_Encoding* info)
 {
@@ -215,7 +215,7 @@ private:
     return true;
   }
 
-  void StartElement(const std::string& name, const char**) CM_OVERRIDE
+  void StartElement(const std::string& name, const char** /*atts*/) CM_OVERRIDE
   {
     this->CData.clear();
     if (name == "log") {
@@ -275,7 +275,7 @@ private:
     this->CData.clear();
   }
 
-  void ReportError(int, int, const char* msg) CM_OVERRIDE
+  void ReportError(int /*line*/, int /*column*/, const char* msg) CM_OVERRIDE
   {
     this->BZR->Log << "Error parsing bzr log xml: " << msg << "\n";
   }
diff --git a/Source/CTest/cmCTestBuildAndTestHandler.cxx b/Source/CTest/cmCTestBuildAndTestHandler.cxx
index eddbddc52..9dab98a0c 100644
--- a/Source/CTest/cmCTestBuildAndTestHandler.cxx
+++ b/Source/CTest/cmCTestBuildAndTestHandler.cxx
@@ -123,14 +123,15 @@ int cmCTestBuildAndTestHandler::RunCMake(std::string* outstring,
   return 0;
 }
 
-void CMakeMessageCallback(const char* m, const char*, bool&, void* s)
+void CMakeMessageCallback(const char* m, const char* /*unused*/,
+                          bool& /*unused*/, void* s)
 {
   std::string* out = (std::string*)s;
   *out += m;
   *out += "\n";
 }
 
-void CMakeProgressCallback(const char* msg, float, void* s)
+void CMakeProgressCallback(const char* msg, float /*unused*/, void* s)
 {
   std::string* out = (std::string*)s;
   *out += msg;
diff --git a/Source/CTest/cmCTestCurl.cxx b/Source/CTest/cmCTestCurl.cxx
index b335e3267..6910f6ff7 100644
--- a/Source/CTest/cmCTestCurl.cxx
+++ b/Source/CTest/cmCTestCurl.cxx
@@ -54,8 +54,8 @@ static size_t curlWriteMemoryCallback(void* ptr, size_t size, size_t nmemb,
   return realsize;
 }
 
-static size_t curlDebugCallback(CURL*, curl_infotype, char* chPtr, size_t size,
-                                void* data)
+static size_t curlDebugCallback(CURL* /*unused*/, curl_infotype /*unused*/,
+                                char* chPtr, size_t size, void* data)
 {
   std::vector<char>* vec = static_cast<std::vector<char>*>(data);
   vec->insert(vec->end(), chPtr, chPtr + size);
diff --git a/Source/CTest/cmCTestEmptyBinaryDirectoryCommand.cxx b/Source/CTest/cmCTestEmptyBinaryDirectoryCommand.cxx
index 1bda9be81..09ae1fcf7 100644
--- a/Source/CTest/cmCTestEmptyBinaryDirectoryCommand.cxx
+++ b/Source/CTest/cmCTestEmptyBinaryDirectoryCommand.cxx
@@ -14,7 +14,7 @@
 #include "cmCTestScriptHandler.h"
 
 bool cmCTestEmptyBinaryDirectoryCommand::InitialPass(
-  std::vector<std::string> const& args, cmExecutionStatus&)
+  std::vector<std::string> const& args, cmExecutionStatus& /*unused*/)
 {
   if (args.size() != 1) {
     this->SetError("called with incorrect number of arguments");
diff --git a/Source/CTest/cmCTestHG.cxx b/Source/CTest/cmCTestHG.cxx
index eb3d611bc..3e62a1abd 100644
--- a/Source/CTest/cmCTestHG.cxx
+++ b/Source/CTest/cmCTestHG.cxx
@@ -261,7 +261,7 @@ private:
     return output;
   }
 
-  void ReportError(int, int, const char* msg) CM_OVERRIDE
+  void ReportError(int /*line*/, int /*column*/, const char* msg) CM_OVERRIDE
   {
     this->HG->Log << "Error parsing hg log xml: " << msg << "\n";
   }
diff --git a/Source/CTest/cmCTestHandlerCommand.cxx b/Source/CTest/cmCTestHandlerCommand.cxx
index e1361a19e..325f8a337 100644
--- a/Source/CTest/cmCTestHandlerCommand.cxx
+++ b/Source/CTest/cmCTestHandlerCommand.cxx
@@ -32,7 +32,7 @@ cmCTestHandlerCommand::cmCTestHandlerCommand()
 }
 
 bool cmCTestHandlerCommand::InitialPass(std::vector<std::string> const& args,
-                                        cmExecutionStatus&)
+                                        cmExecutionStatus& /*unused*/)
 {
   // Allocate space for argument values.
   this->Values.clear();
diff --git a/Source/CTest/cmCTestMemCheckHandler.cxx b/Source/CTest/cmCTestMemCheckHandler.cxx
index dfa8a1a3b..a06c35138 100644
--- a/Source/CTest/cmCTestMemCheckHandler.cxx
+++ b/Source/CTest/cmCTestMemCheckHandler.cxx
@@ -78,7 +78,7 @@ public:
     ostr << "\n";
     this->Log += ostr.str();
   }
-  void EndElement(const std::string&) CM_OVERRIDE {}
+  void EndElement(const std::string& /*name*/) CM_OVERRIDE {}
 
   const char* GetAttribute(const char* name, const char** atts)
   {
diff --git a/Source/CTest/cmCTestReadCustomFilesCommand.cxx b/Source/CTest/cmCTestReadCustomFilesCommand.cxx
index fec23e91f..24e985dd4 100644
--- a/Source/CTest/cmCTestReadCustomFilesCommand.cxx
+++ b/Source/CTest/cmCTestReadCustomFilesCommand.cxx
@@ -14,7 +14,7 @@
 #include "cmCTest.h"
 
 bool cmCTestReadCustomFilesCommand::InitialPass(
-  std::vector<std::string> const& args, cmExecutionStatus&)
+  std::vector<std::string> const& args, cmExecutionStatus& /*unused*/)
 {
   if (args.empty()) {
     this->SetError("called with incorrect number of arguments");
diff --git a/Source/CTest/cmCTestRunScriptCommand.cxx b/Source/CTest/cmCTestRunScriptCommand.cxx
index 6b5e6ed5a..32bf28f5b 100644
--- a/Source/CTest/cmCTestRunScriptCommand.cxx
+++ b/Source/CTest/cmCTestRunScriptCommand.cxx
@@ -14,7 +14,7 @@
 #include "cmCTestScriptHandler.h"
 
 bool cmCTestRunScriptCommand::InitialPass(std::vector<std::string> const& args,
-                                          cmExecutionStatus&)
+                                          cmExecutionStatus& /*unused*/)
 {
   if (args.empty()) {
     this->CTestScriptHandler->RunCurrentScript();
diff --git a/Source/CTest/cmCTestSVN.cxx b/Source/CTest/cmCTestSVN.cxx
index eae0c6ce9..06f838cdf 100644
--- a/Source/CTest/cmCTestSVN.cxx
+++ b/Source/CTest/cmCTestSVN.cxx
@@ -372,7 +372,7 @@ private:
     this->CData.clear();
   }
 
-  void ReportError(int, int, const char* msg) CM_OVERRIDE
+  void ReportError(int /*line*/, int /*column*/, const char* msg) CM_OVERRIDE
   {
     this->SVN->Log << "Error parsing svn log xml: " << msg << "\n";
   }
diff --git a/Source/CTest/cmCTestScriptHandler.cxx b/Source/CTest/cmCTestScriptHandler.cxx
index b747c64c3..44427b0d6 100644
--- a/Source/CTest/cmCTestScriptHandler.cxx
+++ b/Source/CTest/cmCTestScriptHandler.cxx
@@ -61,7 +61,7 @@ public:
   cmCTestScriptFunctionBlocker() {}
   ~cmCTestScriptFunctionBlocker() CM_OVERRIDE {}
   bool IsFunctionBlocked(const cmListFileFunction& lff, cmMakefile& mf,
-                         cmExecutionStatus&) CM_OVERRIDE;
+                         cmExecutionStatus& /*status*/) CM_OVERRIDE;
   // virtual bool ShouldRemove(const cmListFileFunction& lff, cmMakefile &mf);
   // virtual void ScopeEnded(cmMakefile &mf);
 
@@ -69,9 +69,9 @@ public:
 };
 
 // simply update the time and don't block anything
-bool cmCTestScriptFunctionBlocker::IsFunctionBlocked(const cmListFileFunction&,
-                                                     cmMakefile&,
-                                                     cmExecutionStatus&)
+bool cmCTestScriptFunctionBlocker::IsFunctionBlocked(
+  const cmListFileFunction& /*lff*/, cmMakefile& /*mf*/,
+  cmExecutionStatus& /*status*/)
 {
   this->CTestScriptHandler->UpdateElapsedTime();
   return false;
@@ -265,7 +265,8 @@ int cmCTestScriptHandler::ExecuteScript(const std::string& total_script_arg)
   return retVal;
 }
 
-static void ctestScriptProgressCallback(const char* m, float, void* cd)
+static void ctestScriptProgressCallback(const char* m, float /*unused*/,
+                                        void* cd)
 {
   cmCTest* ctest = static_cast<cmCTest*>(cd);
   if (m && *m) {
diff --git a/Source/CTest/cmCTestSleepCommand.cxx b/Source/CTest/cmCTestSleepCommand.cxx
index a6dd6bc97..464f02523 100644
--- a/Source/CTest/cmCTestSleepCommand.cxx
+++ b/Source/CTest/cmCTestSleepCommand.cxx
@@ -15,7 +15,7 @@
 #include <stdlib.h> // required for atoi
 
 bool cmCTestSleepCommand::InitialPass(std::vector<std::string> const& args,
-                                      cmExecutionStatus&)
+                                      cmExecutionStatus& /*unused*/)
 {
   if (args.empty()) {
     this->SetError("called with incorrect number of arguments");
diff --git a/Source/CTest/cmCTestStartCommand.cxx b/Source/CTest/cmCTestStartCommand.cxx
index c64d16b53..04d2f0313 100644
--- a/Source/CTest/cmCTestStartCommand.cxx
+++ b/Source/CTest/cmCTestStartCommand.cxx
@@ -23,7 +23,7 @@ cmCTestStartCommand::cmCTestStartCommand()
 }
 
 bool cmCTestStartCommand::InitialPass(std::vector<std::string> const& args,
-                                      cmExecutionStatus&)
+                                      cmExecutionStatus& /*unused*/)
 {
   if (args.empty()) {
     this->SetError("called with incorrect number of arguments");
diff --git a/Source/CTest/cmCTestSubmitHandler.cxx b/Source/CTest/cmCTestSubmitHandler.cxx
index 67388ad06..42727d0f1 100644
--- a/Source/CTest/cmCTestSubmitHandler.cxx
+++ b/Source/CTest/cmCTestSubmitHandler.cxx
@@ -116,7 +116,8 @@ static size_t cmCTestSubmitHandlerWriteMemoryCallback(void* ptr, size_t size,
   return realsize;
 }
 
-static size_t cmCTestSubmitHandlerCurlDebugCallback(CURL*, curl_infotype,
+static size_t cmCTestSubmitHandlerCurlDebugCallback(CURL* /*unused*/,
+                                                    curl_infotype /*unused*/,
                                                     char* chPtr, size_t size,
                                                     void* data)
 {
@@ -976,10 +977,9 @@ bool cmCTestSubmitHandler::SubmitUsingXMLRPC(
   return true;
 }
 #else
-bool cmCTestSubmitHandler::SubmitUsingXMLRPC(std::string const&,
-                                             std::set<std::string> const&,
-                                             std::string const&,
-                                             std::string const&)
+bool cmCTestSubmitHandler::SubmitUsingXMLRPC(
+  std::string const& /*unused*/, std::set<std::string> const& /*unused*/,
+  std::string const& /*unused*/, std::string const& /*unused*/)
 {
   return false;
 }
diff --git a/Source/CTest/cmCTestTestHandler.cxx b/Source/CTest/cmCTestTestHandler.cxx
index cd250fbba..b932277a0 100644
--- a/Source/CTest/cmCTestTestHandler.cxx
+++ b/Source/CTest/cmCTestTestHandler.cxx
@@ -54,7 +54,7 @@ public:
    * the CMakeLists.txt file.
    */
   bool InitialPass(std::vector<std::string> const& args,
-                   cmExecutionStatus&) CM_OVERRIDE;
+                   cmExecutionStatus& /*unused*/) CM_OVERRIDE;
 
   /**
    * The name of the command as specified in CMakeList.txt.
@@ -67,7 +67,7 @@ public:
 };
 
 bool cmCTestSubdirCommand::InitialPass(std::vector<std::string> const& args,
-                                       cmExecutionStatus&)
+                                       cmExecutionStatus& /*unused*/)
 {
   if (args.empty()) {
     this->SetError("called with incorrect number of arguments");
@@ -135,7 +135,7 @@ public:
    * the CMakeLists.txt file.
    */
   bool InitialPass(std::vector<std::string> const& args,
-                   cmExecutionStatus&) CM_OVERRIDE;
+                   cmExecutionStatus& /*unused*/) CM_OVERRIDE;
 
   /**
    * The name of the command as specified in CMakeList.txt.
@@ -148,7 +148,7 @@ public:
 };
 
 bool cmCTestAddSubdirectoryCommand::InitialPass(
-  std::vector<std::string> const& args, cmExecutionStatus&)
+  std::vector<std::string> const& args, cmExecutionStatus& /*unused*/)
 {
   if (args.empty()) {
     this->SetError("called with incorrect number of arguments");
@@ -208,8 +208,8 @@ public:
    * This is called when the command is first encountered in
    * the CMakeLists.txt file.
    */
-  bool InitialPass(std::vector<std::string> const&,
-                   cmExecutionStatus&) CM_OVERRIDE;
+  bool InitialPass(std::vector<std::string> const& /*args*/,
+                   cmExecutionStatus& /*unused*/) CM_OVERRIDE;
 
   /**
    * The name of the command as specified in CMakeList.txt.
@@ -222,7 +222,7 @@ public:
 };
 
 bool cmCTestAddTestCommand::InitialPass(std::vector<std::string> const& args,
-                                        cmExecutionStatus&)
+                                        cmExecutionStatus& /*unused*/)
 {
   if (args.size() < 2) {
     this->SetError("called with incorrect number of arguments");
@@ -248,8 +248,8 @@ public:
    * This is called when the command is first encountered in
    * the CMakeLists.txt file.
   */
-  bool InitialPass(std::vector<std::string> const&,
-                   cmExecutionStatus&) CM_OVERRIDE;
+  bool InitialPass(std::vector<std::string> const& /*args*/,
+                   cmExecutionStatus& /*unused*/) CM_OVERRIDE;
 
   /**
    * The name of the command as specified in CMakeList.txt.
@@ -262,7 +262,7 @@ public:
 };
 
 bool cmCTestSetTestsPropertiesCommand::InitialPass(
-  std::vector<std::string> const& args, cmExecutionStatus&)
+  std::vector<std::string> const& args, cmExecutionStatus& /*unused*/)
 {
   return this->TestHandler->SetTestsProperties(args);
 }
@@ -986,7 +986,8 @@ void cmCTestTestHandler::ProcessDirectory(std::vector<std::string>& passed,
   *this->LogFile << "End testing: " << this->CTest->CurrentTime() << std::endl;
 }
 
-void cmCTestTestHandler::GenerateTestCommand(std::vector<std::string>&, int)
+void cmCTestTestHandler::GenerateTestCommand(
+  std::vector<std::string>& /*unused*/, int /*unused*/)
 {
 }
 
diff --git a/Source/CTest/cmCTestVC.cxx b/Source/CTest/cmCTestVC.cxx
index 3376588d0..24557aacc 100644
--- a/Source/CTest/cmCTestVC.cxx
+++ b/Source/CTest/cmCTestVC.cxx
@@ -185,7 +185,7 @@ bool cmCTestVC::WriteXML(cmXMLWriter& xml)
   return result;
 }
 
-bool cmCTestVC::WriteXMLUpdates(cmXMLWriter&)
+bool cmCTestVC::WriteXMLUpdates(cmXMLWriter& /*unused*/)
 {
   cmCTestLog(this->CTest, HANDLER_VERBOSE_OUTPUT,
              "* CTest cannot extract updates for this VCS tool.\n");
diff --git a/Source/CTest/cmParseJacocoCoverage.cxx b/Source/CTest/cmParseJacocoCoverage.cxx
index 93258121a..bc0566643 100644
--- a/Source/CTest/cmParseJacocoCoverage.cxx
+++ b/Source/CTest/cmParseJacocoCoverage.cxx
@@ -23,7 +23,7 @@ public:
   ~XMLParser() CM_OVERRIDE {}
 
 protected:
-  void EndElement(const std::string&) CM_OVERRIDE {}
+  void EndElement(const std::string& /*name*/) CM_OVERRIDE {}
 
   void StartElement(const std::string& name, const char** atts) CM_OVERRIDE
   {
diff --git a/Source/CursesDialog/ccmake.cxx b/Source/CursesDialog/ccmake.cxx
index 606c9541e..80bb55d2a 100644
--- a/Source/CursesDialog/ccmake.cxx
+++ b/Source/CursesDialog/ccmake.cxx
@@ -51,7 +51,7 @@ cmCursesForm* cmCursesForm::CurrentForm = CM_NULLPTR;
 
 extern "C" {
 
-void onsig(int)
+void onsig(int /*unused*/)
 {
   if (cmCursesForm::CurrentForm) {
     endwin();
@@ -70,8 +70,8 @@ void onsig(int)
 }
 }
 
-void CMakeMessageHandler(const char* message, const char* title, bool&,
-                         void* clientData)
+void CMakeMessageHandler(const char* message, const char* title,
+                         bool& /*unused*/, void* clientData)
 {
   cmCursesForm* self = static_cast<cmCursesForm*>(clientData);
   self->AddError(message, title);
diff --git a/Source/CursesDialog/cmCursesBoolWidget.cxx b/Source/CursesDialog/cmCursesBoolWidget.cxx
index e36ac3402..068bcdcfb 100644
--- a/Source/CursesDialog/cmCursesBoolWidget.cxx
+++ b/Source/CursesDialog/cmCursesBoolWidget.cxx
@@ -24,7 +24,8 @@ cmCursesBoolWidget::cmCursesBoolWidget(int width, int height, int left,
   this->SetValueAsBool(false);
 }
 
-bool cmCursesBoolWidget::HandleInput(int& key, cmCursesMainForm*, WINDOW* w)
+bool cmCursesBoolWidget::HandleInput(int& key, cmCursesMainForm* /*fm*/,
+                                     WINDOW* w)
 {
 
   // toggle boolean values with enter or space
diff --git a/Source/CursesDialog/cmCursesDummyWidget.cxx b/Source/CursesDialog/cmCursesDummyWidget.cxx
index 3cd36af09..a96009015 100644
--- a/Source/CursesDialog/cmCursesDummyWidget.cxx
+++ b/Source/CursesDialog/cmCursesDummyWidget.cxx
@@ -18,7 +18,8 @@ cmCursesDummyWidget::cmCursesDummyWidget(int width, int height, int left,
   this->Type = cmState::INTERNAL;
 }
 
-bool cmCursesDummyWidget::HandleInput(int&, cmCursesMainForm*, WINDOW*)
+bool cmCursesDummyWidget::HandleInput(int& /*key*/, cmCursesMainForm* /*fm*/,
+                                      WINDOW* /*w*/)
 {
   return false;
 }
diff --git a/Source/CursesDialog/cmCursesLabelWidget.cxx b/Source/CursesDialog/cmCursesLabelWidget.cxx
index e9da71e63..784738bf0 100644
--- a/Source/CursesDialog/cmCursesLabelWidget.cxx
+++ b/Source/CursesDialog/cmCursesLabelWidget.cxx
@@ -25,7 +25,8 @@ cmCursesLabelWidget::~cmCursesLabelWidget()
 {
 }
 
-bool cmCursesLabelWidget::HandleInput(int&, cmCursesMainForm*, WINDOW*)
+bool cmCursesLabelWidget::HandleInput(int& /*key*/, cmCursesMainForm* /*fm*/,
+                                      WINDOW* /*w*/)
 {
   // Static text. No input is handled here.
   return false;
diff --git a/Source/CursesDialog/cmCursesLongMessageForm.cxx b/Source/CursesDialog/cmCursesLongMessageForm.cxx
index 48cc42c58..47f98a2c8 100644
--- a/Source/CursesDialog/cmCursesLongMessageForm.cxx
+++ b/Source/CursesDialog/cmCursesLongMessageForm.cxx
@@ -102,7 +102,8 @@ void cmCursesLongMessageForm::PrintKeys()
   pos_form_cursor(this->Form);
 }
 
-void cmCursesLongMessageForm::Render(int, int, int, int)
+void cmCursesLongMessageForm::Render(int /*left*/, int /*top*/, int /*width*/,
+                                     int /*height*/)
 {
   int x, y;
   getmaxyx(stdscr, y, x);
diff --git a/Source/CursesDialog/cmCursesMainForm.cxx b/Source/CursesDialog/cmCursesMainForm.cxx
index 964f3af55..1d036c439 100644
--- a/Source/CursesDialog/cmCursesMainForm.cxx
+++ b/Source/CursesDialog/cmCursesMainForm.cxx
@@ -675,7 +675,7 @@ int cmCursesMainForm::Generate()
   return 0;
 }
 
-void cmCursesMainForm::AddError(const char* message, const char*)
+void cmCursesMainForm::AddError(const char* message, const char* /*unused*/)
 {
   this->Errors.push_back(message);
 }
@@ -1028,7 +1028,7 @@ void cmCursesMainForm::HandleInput()
   }
 }
 
-int cmCursesMainForm::LoadCache(const char*)
+int cmCursesMainForm::LoadCache(const char* /*unused*/)
 
 {
   int r = this->CMakeInstance->LoadCache();
diff --git a/Source/CursesDialog/cmCursesOptionsWidget.cxx b/Source/CursesDialog/cmCursesOptionsWidget.cxx
index 1a3a8c292..5892e53c2 100644
--- a/Source/CursesDialog/cmCursesOptionsWidget.cxx
+++ b/Source/CursesDialog/cmCursesOptionsWidget.cxx
@@ -31,7 +31,8 @@ cmCursesOptionsWidget::cmCursesOptionsWidget(int width, int height, int left,
   field_opts_off(this->Field, O_STATIC);
 }
 
-bool cmCursesOptionsWidget::HandleInput(int& key, cmCursesMainForm*, WINDOW* w)
+bool cmCursesOptionsWidget::HandleInput(int& key, cmCursesMainForm* /*fm*/,
+                                        WINDOW* w)
 {
 
   // 10 == enter
diff --git a/Source/CursesDialog/cmCursesStringWidget.cxx b/Source/CursesDialog/cmCursesStringWidget.cxx
index 46b8b8609..c16de23e2 100644
--- a/Source/CursesDialog/cmCursesStringWidget.cxx
+++ b/Source/CursesDialog/cmCursesStringWidget.cxx
@@ -29,12 +29,13 @@ cmCursesStringWidget::cmCursesStringWidget(int width, int height, int left,
   field_opts_off(this->Field, O_STATIC);
 }
 
-void cmCursesStringWidget::OnTab(cmCursesMainForm*, WINDOW*)
+void cmCursesStringWidget::OnTab(cmCursesMainForm* /*unused*/,
+                                 WINDOW* /*unused*/)
 {
   // FORM* form = fm->GetForm();
 }
 
-void cmCursesStringWidget::OnReturn(cmCursesMainForm* fm, WINDOW*)
+void cmCursesStringWidget::OnReturn(cmCursesMainForm* fm, WINDOW* /*unused*/)
 {
   FORM* form = fm->GetForm();
   if (this->InEdit) {
@@ -56,7 +57,8 @@ void cmCursesStringWidget::OnReturn(cmCursesMainForm* fm, WINDOW*)
   }
 }
 
-void cmCursesStringWidget::OnType(int& key, cmCursesMainForm* fm, WINDOW*)
+void cmCursesStringWidget::OnType(int& key, cmCursesMainForm* fm,
+                                  WINDOW* /*unused*/)
 {
   form_driver(fm->GetForm(), key);
 }
diff --git a/Source/cmArchiveWrite.cxx b/Source/cmArchiveWrite.cxx
index ceb7d31cf..3da4f28ff 100644
--- a/Source/cmArchiveWrite.cxx
+++ b/Source/cmArchiveWrite.cxx
@@ -64,7 +64,8 @@ public:
 struct cmArchiveWrite::Callback
 {
   // archive_write_callback
-  static __LA_SSIZE_T Write(struct archive*, void* cd, const void* b, size_t n)
+  static __LA_SSIZE_T Write(struct archive* /*unused*/, void* cd,
+                            const void* b, size_t n)
   {
     cmArchiveWrite* self = static_cast<cmArchiveWrite*>(cd);
     if (self->Stream.write(static_cast<const char*>(b),
diff --git a/Source/cmDepends.cxx b/Source/cmDepends.cxx
index b25e3cef2..ce72eda03 100644
--- a/Source/cmDepends.cxx
+++ b/Source/cmDepends.cxx
@@ -72,7 +72,7 @@ bool cmDepends::Write(std::ostream& makeDepends, std::ostream& internalDepends)
   return this->Finalize(makeDepends, internalDepends);
 }
 
-bool cmDepends::Finalize(std::ostream&, std::ostream&)
+bool cmDepends::Finalize(std::ostream& /*unused*/, std::ostream& /*unused*/)
 {
   return true;
 }
@@ -123,9 +123,10 @@ void cmDepends::Clear(const char* file)
                 << std::endl;
 }
 
-bool cmDepends::WriteDependencies(const std::set<std::string>&,
-                                  const std::string&, std::ostream&,
-                                  std::ostream&)
+bool cmDepends::WriteDependencies(const std::set<std::string>& /*unused*/,
+                                  const std::string& /*unused*/,
+                                  std::ostream& /*unused*/,
+                                  std::ostream& /*unused*/)
 {
   // This should be implemented by the subclass.
   return false;
diff --git a/Source/cmDependsFortran.cxx b/Source/cmDependsFortran.cxx
index 9ea1e4851..d1521f04b 100644
--- a/Source/cmDependsFortran.cxx
+++ b/Source/cmDependsFortran.cxx
@@ -91,8 +91,9 @@ cmDependsFortran::~cmDependsFortran()
 }
 
 bool cmDependsFortran::WriteDependencies(const std::set<std::string>& sources,
-                                         const std::string& obj, std::ostream&,
-                                         std::ostream&)
+                                         const std::string& obj,
+                                         std::ostream& /*makeDepends*/,
+                                         std::ostream& /*internalDepends*/)
 {
   // Make sure this is a scanning instance.
   if (sources.empty() || sources.begin()->empty()) {
diff --git a/Source/cmDependsJava.cxx b/Source/cmDependsJava.cxx
index 4f5e2ae79..a9130e67b 100644
--- a/Source/cmDependsJava.cxx
+++ b/Source/cmDependsJava.cxx
@@ -23,8 +23,9 @@ cmDependsJava::~cmDependsJava()
 }
 
 bool cmDependsJava::WriteDependencies(const std::set<std::string>& sources,
-                                      const std::string&, std::ostream&,
-                                      std::ostream&)
+                                      const std::string& /*obj*/,
+                                      std::ostream& /*makeDepends*/,
+                                      std::ostream& /*internalDepends*/)
 {
   // Make sure this is a scanning instance.
   if (sources.empty() || sources.begin()->empty()) {
@@ -35,8 +36,9 @@ bool cmDependsJava::WriteDependencies(const std::set<std::string>& sources,
   return true;
 }
 
-bool cmDependsJava::CheckDependencies(std::istream&, const char*,
-                                      std::map<std::string, DependencyVector>&)
+bool cmDependsJava::CheckDependencies(
+  std::istream& /*internalDepends*/, const char* /*internalDependsFileName*/,
+  std::map<std::string, DependencyVector>& /*validDeps*/)
 {
   return true;
 }
diff --git a/Source/cmDynamicLoader.cxx b/Source/cmDynamicLoader.cxx
index 4c31733f7..f6841ad54 100644
--- a/Source/cmDynamicLoader.cxx
+++ b/Source/cmDynamicLoader.cxx
@@ -15,8 +15,10 @@ class cmDynamicLoaderCache
 {
 public:
   ~cmDynamicLoaderCache();
-  void CacheFile(const char* path, const cmsys::DynamicLoader::LibraryHandle&);
-  bool GetCacheFile(const char* path, cmsys::DynamicLoader::LibraryHandle&);
+  void CacheFile(const char* path,
+                 const cmsys::DynamicLoader::LibraryHandle& /*p*/);
+  bool GetCacheFile(const char* path,
+                    cmsys::DynamicLoader::LibraryHandle& /*p*/);
   bool FlushCache(const char* path);
   void FlushCache();
   static cmDynamicLoaderCache* GetInstance();
diff --git a/Source/cmELF.cxx b/Source/cmELF.cxx
index 266b78636..c687e2f25 100644
--- a/Source/cmELF.cxx
+++ b/Source/cmELF.cxx
@@ -55,17 +55,17 @@ template <size_t s>
 struct cmELFByteSwapSize
 {
 };
-void cmELFByteSwap(char*, cmELFByteSwapSize<1> const&)
+void cmELFByteSwap(char* /*unused*/, cmELFByteSwapSize<1> const& /*unused*/)
 {
 }
-void cmELFByteSwap(char* data, cmELFByteSwapSize<2> const&)
+void cmELFByteSwap(char* data, cmELFByteSwapSize<2> const& /*unused*/)
 {
   char one_byte;
   one_byte = data[0];
   data[0] = data[1];
   data[1] = one_byte;
 }
-void cmELFByteSwap(char* data, cmELFByteSwapSize<4> const&)
+void cmELFByteSwap(char* data, cmELFByteSwapSize<4> const& /*unused*/)
 {
   char one_byte;
   one_byte = data[0];
@@ -75,7 +75,7 @@ void cmELFByteSwap(char* data, cmELFByteSwapSize<4> const&)
   data[1] = data[2];
   data[2] = one_byte;
 }
-void cmELFByteSwap(char* data, cmELFByteSwapSize<8> const&)
+void cmELFByteSwap(char* data, cmELFByteSwapSize<8> const& /*unused*/)
 {
   char one_byte;
   one_byte = data[0];
diff --git a/Source/cmExportFileGenerator.cxx b/Source/cmExportFileGenerator.cxx
index e00af5ef0..7f01196c8 100644
--- a/Source/cmExportFileGenerator.cxx
+++ b/Source/cmExportFileGenerator.cxx
@@ -679,7 +679,7 @@ void cmExportFileGenerator::ResolveTargetsInGeneratorExpression(
   }
 }
 
-void cmExportFileGenerator::ReplaceInstallPrefix(std::string&)
+void cmExportFileGenerator::ReplaceInstallPrefix(std::string& /*unused*/)
 {
   // Do nothing
 }
diff --git a/Source/cmExportInstallFileGenerator.cxx b/Source/cmExportInstallFileGenerator.cxx
index 38b08f0e7..77471574c 100644
--- a/Source/cmExportInstallFileGenerator.cxx
+++ b/Source/cmExportInstallFileGenerator.cxx
@@ -468,7 +468,7 @@ void cmExportInstallFileGenerator::ComplainAboutMissingTarget(
 }
 
 std::string cmExportInstallFileGenerator::InstallNameDir(
-  cmGeneratorTarget* target, const std::string&)
+  cmGeneratorTarget* target, const std::string& /*config*/)
 {
   std::string install_name_dir;
 
diff --git a/Source/cmExternalMakefileProjectGenerator.cxx b/Source/cmExternalMakefileProjectGenerator.cxx
index a527e5017..b01290cf5 100644
--- a/Source/cmExternalMakefileProjectGenerator.cxx
+++ b/Source/cmExternalMakefileProjectGenerator.cxx
@@ -15,7 +15,8 @@
 #include <assert.h>
 
 void cmExternalMakefileProjectGenerator::EnableLanguage(
-  std::vector<std::string> const&, cmMakefile*, bool)
+  std::vector<std::string> const& /*unused*/, cmMakefile* /*unused*/,
+  bool /*unused*/)
 {
 }
 
diff --git a/Source/cmExtraEclipseCDT4Generator.cxx b/Source/cmExtraEclipseCDT4Generator.cxx
index 7a277c0d0..e617b08c1 100644
--- a/Source/cmExtraEclipseCDT4Generator.cxx
+++ b/Source/cmExtraEclipseCDT4Generator.cxx
@@ -77,7 +77,8 @@ cmExtraEclipseCDT4Generator::GetFactory()
 }
 
 void cmExtraEclipseCDT4Generator::EnableLanguage(
-  std::vector<std::string> const& languages, cmMakefile*, bool)
+  std::vector<std::string> const& languages, cmMakefile* /*unused*/,
+  bool /*optional*/)
 {
   for (std::vector<std::string>::const_iterator lit = languages.begin();
        lit != languages.end(); ++lit) {
diff --git a/Source/cmExtraSublimeTextGenerator.cxx b/Source/cmExtraSublimeTextGenerator.cxx
index 5c909c8b9..6e81ee1d7 100644
--- a/Source/cmExtraSublimeTextGenerator.cxx
+++ b/Source/cmExtraSublimeTextGenerator.cxx
@@ -206,8 +206,7 @@ void cmExtraSublimeTextGenerator::AppendAllTargets(
 void cmExtraSublimeTextGenerator::AppendTarget(
   cmGeneratedFileStream& fout, const std::string& targetName,
   cmLocalGenerator* lg, cmGeneratorTarget* target, const char* make,
-  const cmMakefile* makefile,
-  const char*, // compiler
+  const cmMakefile* makefile, const char* /*compiler*/,
   MapSourceFileFlags& sourceFileFlags, bool firstTarget)
 {
 
diff --git a/Source/cmFortranParserImpl.cxx b/Source/cmFortranParserImpl.cxx
index a72204ae8..7d0489889 100644
--- a/Source/cmFortranParserImpl.cxx
+++ b/Source/cmFortranParserImpl.cxx
@@ -161,7 +161,7 @@ int cmFortranParser_GetOldStartcond(cmFortranParser* parser)
   return parser->OldStartcond;
 }
 
-void cmFortranParser_Error(cmFortranParser*, const char*)
+void cmFortranParser_Error(cmFortranParser* /*unused*/, const char* /*unused*/)
 {
   // If there is a parser error just ignore it.  The source will not
   // compile and the user will edit it.  Then dependencies will have
diff --git a/Source/cmGeneratorExpressionDAGChecker.cxx b/Source/cmGeneratorExpressionDAGChecker.cxx
index c70015616..045ded1b4 100644
--- a/Source/cmGeneratorExpressionDAGChecker.cxx
+++ b/Source/cmGeneratorExpressionDAGChecker.cxx
@@ -198,7 +198,7 @@ enum TransitiveProperty
 };
 
 template <TransitiveProperty>
-bool additionalTest(const char* const)
+bool additionalTest(const char* const /*unused*/)
 {
   return false;
 }
diff --git a/Source/cmGeneratorExpressionNode.cxx b/Source/cmGeneratorExpressionNode.cxx
index 6e2b16aae..86fbd446f 100644
--- a/Source/cmGeneratorExpressionNode.cxx
+++ b/Source/cmGeneratorExpressionNode.cxx
@@ -46,10 +46,11 @@ static const struct ZeroNode : public cmGeneratorExpressionNode
 
   bool AcceptsArbitraryContentParameter() const CM_OVERRIDE { return true; }
 
-  std::string Evaluate(const std::vector<std::string>&,
-                       cmGeneratorExpressionContext*,
-                       const GeneratorExpressionContent*,
-                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
+  std::string Evaluate(const std::vector<std::string>& /*parameters*/,
+                       cmGeneratorExpressionContext* /*context*/,
+                       const GeneratorExpressionContent* /*content*/,
+                       cmGeneratorExpressionDAGChecker* /*dagChecker*/) const
+    CM_OVERRIDE
   {
     return std::string();
   }
@@ -62,9 +63,10 @@ static const struct OneNode : public cmGeneratorExpressionNode
   bool AcceptsArbitraryContentParameter() const CM_OVERRIDE { return true; }
 
   std::string Evaluate(const std::vector<std::string>& parameters,
-                       cmGeneratorExpressionContext*,
-                       const GeneratorExpressionContent*,
-                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
+                       cmGeneratorExpressionContext* /*context*/,
+                       const GeneratorExpressionContent* /*content*/,
+                       cmGeneratorExpressionDAGChecker* /*dagChecker*/) const
+    CM_OVERRIDE
   {
     return parameters.front();
   }
@@ -113,7 +115,8 @@ static const struct NotNode : public cmGeneratorExpressionNode
   std::string Evaluate(const std::vector<std::string>& parameters,
                        cmGeneratorExpressionContext* context,
                        const GeneratorExpressionContent* content,
-                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
+                       cmGeneratorExpressionDAGChecker* /*dagChecker*/) const
+    CM_OVERRIDE
   {
     if (*parameters.begin() != "0" && *parameters.begin() != "1") {
       reportError(
@@ -132,9 +135,10 @@ static const struct BoolNode : public cmGeneratorExpressionNode
   int NumExpectedParameters() const CM_OVERRIDE { return 1; }
 
   std::string Evaluate(const std::vector<std::string>& parameters,
-                       cmGeneratorExpressionContext*,
-                       const GeneratorExpressionContent*,
-                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
+                       cmGeneratorExpressionContext* /*context*/,
+                       const GeneratorExpressionContent* /*content*/,
+                       cmGeneratorExpressionDAGChecker* /*dagChecker*/) const
+    CM_OVERRIDE
   {
     return !cmSystemTools::IsOff(parameters.begin()->c_str()) ? "1" : "0";
   }
@@ -147,9 +151,10 @@ static const struct StrEqualNode : public cmGeneratorExpressionNode
   int NumExpectedParameters() const CM_OVERRIDE { return 2; }
 
   std::string Evaluate(const std::vector<std::string>& parameters,
-                       cmGeneratorExpressionContext*,
-                       const GeneratorExpressionContent*,
-                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
+                       cmGeneratorExpressionContext* /*context*/,
+                       const GeneratorExpressionContent* /*content*/,
+                       cmGeneratorExpressionDAGChecker* /*dagChecker*/) const
+    CM_OVERRIDE
   {
     return *parameters.begin() == parameters[1] ? "1" : "0";
   }
@@ -164,7 +169,8 @@ static const struct EqualNode : public cmGeneratorExpressionNode
   std::string Evaluate(const std::vector<std::string>& parameters,
                        cmGeneratorExpressionContext* context,
                        const GeneratorExpressionContent* content,
-                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
+                       cmGeneratorExpressionDAGChecker* /*dagChecker*/) const
+    CM_OVERRIDE
   {
     char* pEnd;
 
@@ -239,9 +245,10 @@ static const struct LowerCaseNode : public cmGeneratorExpressionNode
   bool AcceptsArbitraryContentParameter() const CM_OVERRIDE { return true; }
 
   std::string Evaluate(const std::vector<std::string>& parameters,
-                       cmGeneratorExpressionContext*,
-                       const GeneratorExpressionContent*,
-                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
+                       cmGeneratorExpressionContext* /*context*/,
+                       const GeneratorExpressionContent* /*content*/,
+                       cmGeneratorExpressionDAGChecker* /*dagChecker*/) const
+    CM_OVERRIDE
   {
     return cmSystemTools::LowerCase(parameters.front());
   }
@@ -254,9 +261,10 @@ static const struct UpperCaseNode : public cmGeneratorExpressionNode
   bool AcceptsArbitraryContentParameter() const CM_OVERRIDE { return true; }
 
   std::string Evaluate(const std::vector<std::string>& parameters,
-                       cmGeneratorExpressionContext*,
-                       const GeneratorExpressionContent*,
-                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
+                       cmGeneratorExpressionContext* /*context*/,
+                       const GeneratorExpressionContent* /*content*/,
+                       cmGeneratorExpressionDAGChecker* /*dagChecker*/) const
+    CM_OVERRIDE
   {
     return cmSystemTools::UpperCase(parameters.front());
   }
@@ -269,9 +277,10 @@ static const struct MakeCIdentifierNode : public cmGeneratorExpressionNode
   bool AcceptsArbitraryContentParameter() const CM_OVERRIDE { return true; }
 
   std::string Evaluate(const std::vector<std::string>& parameters,
-                       cmGeneratorExpressionContext*,
-                       const GeneratorExpressionContent*,
-                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
+                       cmGeneratorExpressionContext* /*context*/,
+                       const GeneratorExpressionContent* /*content*/,
+                       cmGeneratorExpressionDAGChecker* /*dagChecker*/) const
+    CM_OVERRIDE
   {
     return cmSystemTools::MakeCidentifier(parameters.front());
   }
@@ -283,10 +292,11 @@ static const struct Angle_RNode : public cmGeneratorExpressionNode
 
   int NumExpectedParameters() const CM_OVERRIDE { return 0; }
 
-  std::string Evaluate(const std::vector<std::string>&,
-                       cmGeneratorExpressionContext*,
-                       const GeneratorExpressionContent*,
-                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
+  std::string Evaluate(const std::vector<std::string>& /*parameters*/,
+                       cmGeneratorExpressionContext* /*context*/,
+                       const GeneratorExpressionContent* /*content*/,
+                       cmGeneratorExpressionDAGChecker* /*dagChecker*/) const
+    CM_OVERRIDE
   {
     return ">";
   }
@@ -298,10 +308,11 @@ static const struct CommaNode : public cmGeneratorExpressionNode
 
   int NumExpectedParameters() const CM_OVERRIDE { return 0; }
 
-  std::string Evaluate(const std::vector<std::string>&,
-                       cmGeneratorExpressionContext*,
-                       const GeneratorExpressionContent*,
-                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
+  std::string Evaluate(const std::vector<std::string>& /*parameters*/,
+                       cmGeneratorExpressionContext* /*context*/,
+                       const GeneratorExpressionContent* /*content*/,
+                       cmGeneratorExpressionDAGChecker* /*dagChecker*/) const
+    CM_OVERRIDE
   {
     return ",";
   }
@@ -313,10 +324,11 @@ static const struct SemicolonNode : public cmGeneratorExpressionNode
 
   int NumExpectedParameters() const CM_OVERRIDE { return 0; }
 
-  std::string Evaluate(const std::vector<std::string>&,
-                       cmGeneratorExpressionContext*,
-                       const GeneratorExpressionContent*,
-                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
+  std::string Evaluate(const std::vector<std::string>& /*parameters*/,
+                       cmGeneratorExpressionContext* /*context*/,
+                       const GeneratorExpressionContent* /*content*/,
+                       cmGeneratorExpressionDAGChecker* /*dagChecker*/) const
+    CM_OVERRIDE
   {
     return ";";
   }
@@ -331,7 +343,7 @@ struct CompilerIdNode : public cmGeneratorExpressionNode
   std::string EvaluateWithLanguage(const std::vector<std::string>& parameters,
                                    cmGeneratorExpressionContext* context,
                                    const GeneratorExpressionContent* content,
-                                   cmGeneratorExpressionDAGChecker*,
+                                   cmGeneratorExpressionDAGChecker* /*unused*/,
                                    const std::string& lang) const
   {
     const char* compilerId = context->LG->GetMakefile()->GetSafeDefinition(
@@ -426,7 +438,7 @@ struct CompilerVersionNode : public cmGeneratorExpressionNode
   std::string EvaluateWithLanguage(const std::vector<std::string>& parameters,
                                    cmGeneratorExpressionContext* context,
                                    const GeneratorExpressionContent* content,
-                                   cmGeneratorExpressionDAGChecker*,
+                                   cmGeneratorExpressionDAGChecker* /*unused*/,
                                    const std::string& lang) const
   {
     const char* compilerVersion =
@@ -506,8 +518,9 @@ struct PlatformIdNode : public cmGeneratorExpressionNode
 
   std::string Evaluate(const std::vector<std::string>& parameters,
                        cmGeneratorExpressionContext* context,
-                       const GeneratorExpressionContent*,
-                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
+                       const GeneratorExpressionContent* /*content*/,
+                       cmGeneratorExpressionDAGChecker* /*dagChecker*/) const
+    CM_OVERRIDE
   {
     const char* platformId =
       context->LG->GetMakefile()->GetSafeDefinition("CMAKE_SYSTEM_NAME");
@@ -533,9 +546,10 @@ static const struct VersionGreaterNode : public cmGeneratorExpressionNode
   int NumExpectedParameters() const CM_OVERRIDE { return 2; }
 
   std::string Evaluate(const std::vector<std::string>& parameters,
-                       cmGeneratorExpressionContext*,
-                       const GeneratorExpressionContent*,
-                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
+                       cmGeneratorExpressionContext* /*context*/,
+                       const GeneratorExpressionContent* /*content*/,
+                       cmGeneratorExpressionDAGChecker* /*dagChecker*/) const
+    CM_OVERRIDE
   {
     return cmSystemTools::VersionCompare(cmSystemTools::OP_GREATER,
                                          parameters.front().c_str(),
@@ -552,9 +566,10 @@ static const struct VersionGreaterEqNode : public cmGeneratorExpressionNode
   int NumExpectedParameters() const CM_OVERRIDE { return 2; }
 
   std::string Evaluate(const std::vector<std::string>& parameters,
-                       cmGeneratorExpressionContext*,
-                       const GeneratorExpressionContent*,
-                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
+                       cmGeneratorExpressionContext* /*context*/,
+                       const GeneratorExpressionContent* /*content*/,
+                       cmGeneratorExpressionDAGChecker* /*dagChecker*/) const
+    CM_OVERRIDE
   {
     return cmSystemTools::VersionCompare(cmSystemTools::OP_GREATER_EQUAL,
                                          parameters.front().c_str(),
@@ -571,9 +586,10 @@ static const struct VersionLessNode : public cmGeneratorExpressionNode
   int NumExpectedParameters() const CM_OVERRIDE { return 2; }
 
   std::string Evaluate(const std::vector<std::string>& parameters,
-                       cmGeneratorExpressionContext*,
-                       const GeneratorExpressionContent*,
-                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
+                       cmGeneratorExpressionContext* /*context*/,
+                       const GeneratorExpressionContent* /*content*/,
+                       cmGeneratorExpressionDAGChecker* /*dagChecker*/) const
+    CM_OVERRIDE
   {
     return cmSystemTools::VersionCompare(cmSystemTools::OP_LESS,
                                          parameters.front().c_str(),
@@ -590,9 +606,10 @@ static const struct VersionLessEqNode : public cmGeneratorExpressionNode
   int NumExpectedParameters() const CM_OVERRIDE { return 2; }
 
   std::string Evaluate(const std::vector<std::string>& parameters,
-                       cmGeneratorExpressionContext*,
-                       const GeneratorExpressionContent*,
-                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
+                       cmGeneratorExpressionContext* /*context*/,
+                       const GeneratorExpressionContent* /*content*/,
+                       cmGeneratorExpressionDAGChecker* /*dagChecker*/) const
+    CM_OVERRIDE
   {
     return cmSystemTools::VersionCompare(cmSystemTools::OP_LESS_EQUAL,
                                          parameters.front().c_str(),
@@ -609,9 +626,10 @@ static const struct VersionEqualNode : public cmGeneratorExpressionNode
   int NumExpectedParameters() const CM_OVERRIDE { return 2; }
 
   std::string Evaluate(const std::vector<std::string>& parameters,
-                       cmGeneratorExpressionContext*,
-                       const GeneratorExpressionContent*,
-                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
+                       cmGeneratorExpressionContext* /*context*/,
+                       const GeneratorExpressionContent* /*content*/,
+                       cmGeneratorExpressionDAGChecker* /*dagChecker*/) const
+    CM_OVERRIDE
   {
     return cmSystemTools::VersionCompare(cmSystemTools::OP_EQUAL,
                                          parameters.front().c_str(),
@@ -625,10 +643,11 @@ static const struct LinkOnlyNode : public cmGeneratorExpressionNode
 {
   LinkOnlyNode() {}
 
-  std::string Evaluate(
-    const std::vector<std::string>& parameters, cmGeneratorExpressionContext*,
-    const GeneratorExpressionContent*,
-    cmGeneratorExpressionDAGChecker* dagChecker) const CM_OVERRIDE
+  std::string Evaluate(const std::vector<std::string>& parameters,
+                       cmGeneratorExpressionContext* /*context*/,
+                       const GeneratorExpressionContent* /*content*/,
+                       cmGeneratorExpressionDAGChecker* dagChecker) const
+    CM_OVERRIDE
   {
     if (!dagChecker->GetTransitivePropertiesOnly()) {
       return parameters.front();
@@ -643,10 +662,11 @@ static const struct ConfigurationNode : public cmGeneratorExpressionNode
 
   int NumExpectedParameters() const CM_OVERRIDE { return 0; }
 
-  std::string Evaluate(const std::vector<std::string>&,
+  std::string Evaluate(const std::vector<std::string>& /*parameters*/,
                        cmGeneratorExpressionContext* context,
-                       const GeneratorExpressionContent*,
-                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
+                       const GeneratorExpressionContent* /*content*/,
+                       cmGeneratorExpressionDAGChecker* /*dagChecker*/) const
+    CM_OVERRIDE
   {
     context->HadContextSensitiveCondition = true;
     return context->Config;
@@ -662,7 +682,8 @@ static const struct ConfigurationTestNode : public cmGeneratorExpressionNode
   std::string Evaluate(const std::vector<std::string>& parameters,
                        cmGeneratorExpressionContext* context,
                        const GeneratorExpressionContent* content,
-                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
+                       cmGeneratorExpressionDAGChecker* /*dagChecker*/) const
+    CM_OVERRIDE
   {
     if (parameters.empty()) {
       return configurationNode.Evaluate(parameters, context, content,
@@ -721,9 +742,10 @@ static const struct JoinNode : public cmGeneratorExpressionNode
   bool AcceptsArbitraryContentParameter() const CM_OVERRIDE { return true; }
 
   std::string Evaluate(const std::vector<std::string>& parameters,
-                       cmGeneratorExpressionContext*,
-                       const GeneratorExpressionContent*,
-                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
+                       cmGeneratorExpressionContext* /*context*/,
+                       const GeneratorExpressionContent* /*content*/,
+                       cmGeneratorExpressionDAGChecker* /*dagChecker*/) const
+    CM_OVERRIDE
   {
     std::vector<std::string> list;
     cmSystemTools::ExpandListArgument(parameters.front(), list);
@@ -1138,9 +1160,10 @@ static const struct TargetNameNode : public cmGeneratorExpressionNode
   bool RequiresLiteralInput() const CM_OVERRIDE { return true; }
 
   std::string Evaluate(const std::vector<std::string>& parameters,
-                       cmGeneratorExpressionContext*,
-                       const GeneratorExpressionContent*,
-                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
+                       cmGeneratorExpressionContext* /*context*/,
+                       const GeneratorExpressionContent* /*content*/,
+                       cmGeneratorExpressionDAGChecker* /*dagChecker*/) const
+    CM_OVERRIDE
   {
     return parameters.front();
   }
@@ -1156,7 +1179,8 @@ static const struct TargetObjectsNode : public cmGeneratorExpressionNode
   std::string Evaluate(const std::vector<std::string>& parameters,
                        cmGeneratorExpressionContext* context,
                        const GeneratorExpressionContent* content,
-                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
+                       cmGeneratorExpressionDAGChecker* /*dagChecker*/) const
+    CM_OVERRIDE
   {
     if (!context->EvaluateForBuildsystem) {
       std::ostringstream e;
@@ -1357,7 +1381,8 @@ static const struct TargetPolicyNode : public cmGeneratorExpressionNode
   std::string Evaluate(const std::vector<std::string>& parameters,
                        cmGeneratorExpressionContext* context,
                        const GeneratorExpressionContent* content,
-                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
+                       cmGeneratorExpressionDAGChecker* /*dagChecker*/) const
+    CM_OVERRIDE
   {
     if (!context->HeadTarget) {
       reportError(
@@ -1414,10 +1439,11 @@ static const struct InstallPrefixNode : public cmGeneratorExpressionNode
   bool GeneratesContent() const CM_OVERRIDE { return true; }
   int NumExpectedParameters() const CM_OVERRIDE { return 0; }
 
-  std::string Evaluate(const std::vector<std::string>&,
+  std::string Evaluate(const std::vector<std::string>& /*parameters*/,
                        cmGeneratorExpressionContext* context,
                        const GeneratorExpressionContent* content,
-                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
+                       cmGeneratorExpressionDAGChecker* /*dagChecker*/) const
+    CM_OVERRIDE
   {
     reportError(context, content->GetOriginalExpression(),
                 "INSTALL_PREFIX is a marker for install(EXPORT) only.  It "
@@ -1534,7 +1560,7 @@ struct TargetFilesystemArtifactResultCreator<ArtifactNameTag>
 {
   static std::string Create(cmGeneratorTarget* target,
                             cmGeneratorExpressionContext* context,
-                            const GeneratorExpressionContent*)
+                            const GeneratorExpressionContent* /*unused*/)
   {
     return target->GetFullPath(context->Config, false, true);
   }
@@ -1653,7 +1679,8 @@ static const struct ShellPathNode : public cmGeneratorExpressionNode
   std::string Evaluate(const std::vector<std::string>& parameters,
                        cmGeneratorExpressionContext* context,
                        const GeneratorExpressionContent* content,
-                       cmGeneratorExpressionDAGChecker*) const CM_OVERRIDE
+                       cmGeneratorExpressionDAGChecker* /*dagChecker*/) const
+    CM_OVERRIDE
   {
     if (!cmSystemTools::FileIsFullPath(parameters.front())) {
       reportError(context, content->GetOriginalExpression(),
diff --git a/Source/cmGeneratorTarget.cxx b/Source/cmGeneratorTarget.cxx
index 793ad2ec1..308051be4 100644
--- a/Source/cmGeneratorTarget.cxx
+++ b/Source/cmGeneratorTarget.cxx
@@ -128,7 +128,7 @@ template <bool>
 struct DoAccept
 {
   template <typename T>
-  static void Do(T&, cmSourceFile*)
+  static void Do(T& /*unused*/, cmSourceFile* /*unused*/)
   {
   }
 };
@@ -3271,7 +3271,8 @@ template <>
 bool getLinkInterfaceDependentProperty(cmGeneratorTarget const* tgt,
                                        const std::string& prop,
                                        const std::string& config,
-                                       CompatibleType, bool*)
+                                       CompatibleType /*unused*/,
+                                       bool* /*unused*/)
 {
   return tgt->GetLinkInterfaceDependentBoolProperty(prop, config);
 }
@@ -3280,7 +3281,8 @@ template <>
 const char* getLinkInterfaceDependentProperty(cmGeneratorTarget const* tgt,
                                               const std::string& prop,
                                               const std::string& config,
-                                              CompatibleType t, const char**)
+                                              CompatibleType t,
+                                              const char** /*unused*/)
 {
   switch (t) {
     case BoolType:
@@ -3303,7 +3305,7 @@ void checkPropertyConsistency(cmGeneratorTarget const* depender,
                               const std::string& propName,
                               std::set<std::string>& emitted,
                               const std::string& config, CompatibleType t,
-                              PropertyType*)
+                              PropertyType* /*unused*/)
 {
   const char* prop = dependee->GetProperty(propName);
   if (!prop) {
@@ -3536,12 +3538,12 @@ std::string valueAsString<const char*>(const char* value)
 template <typename PropertyType>
 PropertyType impliedValue(PropertyType);
 template <>
-bool impliedValue<bool>(bool)
+bool impliedValue<bool>(bool /*unused*/)
 {
   return false;
 }
 template <>
-const char* impliedValue<const char*>(const char*)
+const char* impliedValue<const char*>(const char* /*unused*/)
 {
   return "";
 }
@@ -3552,7 +3554,8 @@ std::pair<bool, PropertyType> consistentProperty(PropertyType lhs,
                                                  CompatibleType t);
 
 template <>
-std::pair<bool, bool> consistentProperty(bool lhs, bool rhs, CompatibleType)
+std::pair<bool, bool> consistentProperty(bool lhs, bool rhs,
+                                         CompatibleType /*unused*/)
 {
   return std::make_pair(lhs == rhs, lhs);
 }
@@ -3626,7 +3629,7 @@ PropertyType checkInterfacePropertyCompatibility(cmGeneratorTarget const* tgt,
                                                  const std::string& config,
                                                  const char* defaultValue,
                                                  CompatibleType t,
-                                                 PropertyType*)
+                                                 PropertyType* /*unused*/)
 {
   PropertyType propContent = getTypedProperty<PropertyType>(tgt, p);
   std::vector<std::string> headPropKeys = tgt->GetPropertyKeys();
diff --git a/Source/cmGlobalGenerator.cxx b/Source/cmGlobalGenerator.cxx
index 3ec16c0e2..295f65b3c 100644
--- a/Source/cmGlobalGenerator.cxx
+++ b/Source/cmGlobalGenerator.cxx
@@ -1515,7 +1515,8 @@ void cmGlobalGenerator::ClearGeneratorMembers()
   this->BinaryDirectories.clear();
 }
 
-void cmGlobalGenerator::ComputeTargetObjectDirectory(cmGeneratorTarget*) const
+void cmGlobalGenerator::ComputeTargetObjectDirectory(
+  cmGeneratorTarget* /*unused*/) const
 {
 }
 
@@ -1644,15 +1645,17 @@ int cmGlobalGenerator::TryCompile(const std::string& srcdir,
 }
 
 void cmGlobalGenerator::GenerateBuildCommand(
-  std::vector<std::string>& makeCommand, const std::string&,
-  const std::string&, const std::string&, const std::string&,
-  const std::string&, bool, bool, std::vector<std::string> const&)
+  std::vector<std::string>& makeCommand, const std::string& /*unused*/,
+  const std::string& /*unused*/, const std::string& /*unused*/,
+  const std::string& /*unused*/, const std::string& /*unused*/,
+  bool /*unused*/, bool /*unused*/, std::vector<std::string> const& /*unused*/)
 {
   makeCommand.push_back(
     "cmGlobalGenerator::GenerateBuildCommand not implemented");
 }
 
-int cmGlobalGenerator::Build(const std::string&, const std::string& bindir,
+int cmGlobalGenerator::Build(const std::string& /*unused*/,
+                             const std::string& bindir,
                              const std::string& projectName,
                              const std::string& target, std::string& output,
                              const std::string& makeCommandCSTR,
@@ -2372,10 +2375,10 @@ std::string cmGlobalGenerator::GetSharedLibFlagsForLanguage(
   return "";
 }
 
-void cmGlobalGenerator::AppendDirectoryForConfig(const std::string&,
-                                                 const std::string&,
-                                                 const std::string&,
-                                                 std::string&)
+void cmGlobalGenerator::AppendDirectoryForConfig(const std::string& /*unused*/,
+                                                 const std::string& /*unused*/,
+                                                 const std::string& /*unused*/,
+                                                 std::string& /*unused*/)
 {
   // Subclasses that support multiple configurations should implement
   // this method to append the subdirectory for the given build
diff --git a/Source/cmLocalGenerator.cxx b/Source/cmLocalGenerator.cxx
index 2f2979163..accce4908 100644
--- a/Source/cmLocalGenerator.cxx
+++ b/Source/cmLocalGenerator.cxx
@@ -1371,8 +1371,8 @@ void cmLocalGenerator::GetTargetDefines(cmGeneratorTarget const* target,
   this->AddCompileDefinitions(defines, target, config, lang.c_str());
 }
 
-std::string cmLocalGenerator::GetTargetFortranFlags(cmGeneratorTarget const*,
-                                                    std::string const&)
+std::string cmLocalGenerator::GetTargetFortranFlags(
+  cmGeneratorTarget const* /*unused*/, std::string const& /*unused*/)
 {
   // Implemented by specific generators that override this.
   return std::string();
@@ -2478,7 +2478,8 @@ std::string& cmLocalGenerator::CreateSafeUniqueObjectFileName(
 }
 
 void cmLocalGenerator::ComputeObjectFilenames(
-  std::map<cmSourceFile const*, std::string>&, cmGeneratorTarget const*)
+  std::map<cmSourceFile const*, std::string>& /*unused*/,
+  cmGeneratorTarget const* /*unused*/)
 {
 }
 
@@ -2613,7 +2614,7 @@ const char* cmLocalGenerator::GetCurrentSourceDirectory() const
 }
 
 std::string cmLocalGenerator::GetTargetDirectory(
-  const cmGeneratorTarget*) const
+  const cmGeneratorTarget* /*unused*/) const
 {
   cmSystemTools::Error("GetTargetDirectory"
                        " called on cmLocalGenerator");
diff --git a/Source/cmPolicies.cxx b/Source/cmPolicies.cxx
index 124fb6a3d..c456d88ee 100644
--- a/Source/cmPolicies.cxx
+++ b/Source/cmPolicies.cxx
@@ -293,7 +293,8 @@ std::string cmPolicies::GetRequiredPolicyError(cmPolicies::PolicyID id)
 }
 
 ///! Get the default status for a policy
-cmPolicies::PolicyStatus cmPolicies::GetPolicyStatus(cmPolicies::PolicyID)
+cmPolicies::PolicyStatus cmPolicies::GetPolicyStatus(
+  cmPolicies::PolicyID /*unused*/)
 {
   return cmPolicies::WARN;
 }
diff --git a/Source/cmScriptGenerator.cxx b/Source/cmScriptGenerator.cxx
index b8aae5d5e..a000258dc 100644
--- a/Source/cmScriptGenerator.cxx
+++ b/Source/cmScriptGenerator.cxx
@@ -117,9 +117,9 @@ void cmScriptGenerator::GenerateScriptActions(std::ostream& os,
   }
 }
 
-void cmScriptGenerator::GenerateScriptForConfig(std::ostream&,
-                                                const std::string&,
-                                                Indent const&)
+void cmScriptGenerator::GenerateScriptForConfig(std::ostream& /*unused*/,
+                                                const std::string& /*unused*/,
+                                                Indent const& /*unused*/)
 {
   // No actions for this generator.
 }
diff --git a/Source/cmSystemTools.cxx b/Source/cmSystemTools.cxx
index 5745a0127..f19f0f69e 100644
--- a/Source/cmSystemTools.cxx
+++ b/Source/cmSystemTools.cxx
@@ -191,7 +191,8 @@ void cmSystemTools::ExpandRegistryValues(std::string& source, KeyWOW64 view)
   }
 }
 #else
-void cmSystemTools::ExpandRegistryValues(std::string& source, KeyWOW64)
+void cmSystemTools::ExpandRegistryValues(std::string& source,
+                                         KeyWOW64 /*unused*/)
 {
   cmsys::RegularExpression regEntry("\\[(HKEY[^]]*)\\]");
   while (regEntry.find(source)) {
diff --git a/Source/cmXMLParser.cxx b/Source/cmXMLParser.cxx
index 5e06d365d..85d47b6e4 100644
--- a/Source/cmXMLParser.cxx
+++ b/Source/cmXMLParser.cxx
@@ -198,7 +198,7 @@ void cmXMLParser::ReportXmlParseError()
                     XML_ErrorString(XML_GetErrorCode(parser)));
 }
 
-void cmXMLParser::ReportError(int line, int, const char* msg)
+void cmXMLParser::ReportError(int line, int /*unused*/, const char* msg)
 {
   if (this->ReportCallback) {
     this->ReportCallback(line, msg, this->ReportCallbackData);
diff --git a/Source/cmake.cxx b/Source/cmake.cxx
index b11f4f696..08f0a6e65 100644
--- a/Source/cmake.cxx
+++ b/Source/cmake.cxx
@@ -113,8 +113,9 @@
 static bool cmakeCheckStampFile(const char* stampName);
 static bool cmakeCheckStampList(const char* stampName);
 
-void cmWarnUnusedCliWarning(const std::string& variable, int, void* ctx,
-                            const char*, const cmMakefile*)
+void cmWarnUnusedCliWarning(const std::string& variable, int /*unused*/,
+                            void* ctx, const char* /*unused*/,
+                            const cmMakefile* /*unused*/)
 {
   cmake* cm = reinterpret_cast<cmake*>(ctx);
   cm->MarkCliAsUsed(variable);
diff --git a/Source/cmakemain.cxx b/Source/cmakemain.cxx
index 521a5bf16..8731b2b86 100644
--- a/Source/cmakemain.cxx
+++ b/Source/cmakemain.cxx
@@ -124,8 +124,8 @@ static std::string cmakemainGetStack(void* clientdata)
   return msg;
 }
 
-static void cmakemainMessageCallback(const char* m, const char*, bool&,
-                                     void* clientdata)
+static void cmakemainMessageCallback(const char* m, const char* /*unused*/,
+                                     bool& /*unused*/, void* clientdata)
 {
   std::cerr << m << cmakemainGetStack(clientdata) << std::endl << std::flush;
 }
diff --git a/Tests/CMakeLib/testGeneratedFileStream.cxx b/Tests/CMakeLib/testGeneratedFileStream.cxx
index 67dd69a79..e5a2f4d98 100644
--- a/Tests/CMakeLib/testGeneratedFileStream.cxx
+++ b/Tests/CMakeLib/testGeneratedFileStream.cxx
@@ -16,7 +16,7 @@
   std::cout << "FAILED: " << m1 << m2 << "\n";                                \
   failed = 1
 
-int testGeneratedFileStream(int, char* [])
+int testGeneratedFileStream(int /*unused*/, char* /*unused*/ [])
 {
   int failed = 0;
   cmGeneratedFileStream gm;
diff --git a/Tests/CMakeLib/testSystemTools.cxx b/Tests/CMakeLib/testSystemTools.cxx
index a3846c00a..fe958bdee 100644
--- a/Tests/CMakeLib/testSystemTools.cxx
+++ b/Tests/CMakeLib/testSystemTools.cxx
@@ -16,7 +16,7 @@
   std::cout << "FAILED: " << m << "\n";                                       \
   failed = 1
 
-int testSystemTools(int, char* [])
+int testSystemTools(int /*unused*/, char* /*unused*/ [])
 {
   int failed = 0;
   // ----------------------------------------------------------------------
diff --git a/Tests/CMakeLib/testUTF8.cxx b/Tests/CMakeLib/testUTF8.cxx
index 1da23fe69..019a2ddb9 100644
--- a/Tests/CMakeLib/testUTF8.cxx
+++ b/Tests/CMakeLib/testUTF8.cxx
@@ -97,7 +97,7 @@ static bool decode_bad(test_utf8_char const s)
   return true;
 }
 
-int testUTF8(int, char* [])
+int testUTF8(int /*unused*/, char* /*unused*/ [])
 {
   int result = 0;
   for (test_utf8_entry const* e = good_entry; e->n; ++e) {
diff --git a/Tests/CMakeLib/testXMLParser.cxx b/Tests/CMakeLib/testXMLParser.cxx
index 1fd5113c4..d5e9764f9 100644
--- a/Tests/CMakeLib/testXMLParser.cxx
+++ b/Tests/CMakeLib/testXMLParser.cxx
@@ -4,7 +4,7 @@
 
 #include <iostream>
 
-int testXMLParser(int, char* [])
+int testXMLParser(int /*unused*/, char* /*unused*/ [])
 {
   // TODO: Derive from parser and check attributes.
   cmXMLParser parser;
diff --git a/Tests/CMakeLib/testXMLSafe.cxx b/Tests/CMakeLib/testXMLSafe.cxx
index 34c38fb07..4970ccc50 100644
--- a/Tests/CMakeLib/testXMLSafe.cxx
+++ b/Tests/CMakeLib/testXMLSafe.cxx
@@ -28,7 +28,7 @@ static test_pair const pairs[] = {
   { 0, 0 }
 };
 
-int testXMLSafe(int, char* [])
+int testXMLSafe(int /*unused*/, char* /*unused*/ [])
 {
   int result = 0;
   for (test_pair const* p = pairs; p->in; ++p) {