Merge topic 'extract-cmMessenger'

1462576b Parser: Port away from cmMakefile
421012a3 cmMessenger: Extract from cmake class
14a8d61f cmMakefile: Port nested error logic away from cmExecutionStatus
2af853de cmMakefile: Simplify IssueMessage implementation
33bb9cfa Parser: Issue messages through cmake, not cmSystemTools
db7de303 Parser: Store the Backtrace for use in issuing messages

13 files changed, 359 insertions, 229 deletions

diff --git a/Source/CMakeLists.txt b/Source/CMakeLists.txt
index e63bf5a..3b94df7 100644
--- a/Source/CMakeLists.txt
+++ b/Source/CMakeLists.txt
@@ -319,6 +319,8 @@ set(SRCS
   cmMakefileExecutableTargetGenerator.cxx
   cmMakefileLibraryTargetGenerator.cxx
   cmMakefileUtilityTargetGenerator.cxx
+  cmMessenger.cxx
+  cmMessenger.h
   cmOSXBundleGenerator.cxx
   cmOSXBundleGenerator.h
   cmOutputConverter.cxx
diff --git a/Source/cmExecutionStatus.h b/Source/cmExecutionStatus.h
index 508c6bd..8006514 100644
--- a/Source/cmExecutionStatus.h
+++ b/Source/cmExecutionStatus.h
@@ -38,16 +38,12 @@ public:
     this->ReturnInvoked = false;
     this->BreakInvoked = false;
     this->ContinueInvoked = false;
-    this->NestedError = false;
   }
-  void SetNestedError(bool val) { this->NestedError = val; }
-  bool GetNestedError() { return this->NestedError; }
 
 private:
   bool ReturnInvoked;
   bool BreakInvoked;
   bool ContinueInvoked;
-  bool NestedError;
 };
 
 #endif
diff --git a/Source/cmFunctionCommand.cxx b/Source/cmFunctionCommand.cxx
index 40c54db..f0e4854 100644
--- a/Source/cmFunctionCommand.cxx
+++ b/Source/cmFunctionCommand.cxx
@@ -76,7 +76,7 @@ public:
 };
 
 bool cmFunctionHelperCommand::InvokeInitialPass(
-  const std::vector<cmListFileArgument>& args, cmExecutionStatus& inStatus)
+  const std::vector<cmListFileArgument>& args, cmExecutionStatus&)
 {
   // Expand the argument list to the function.
   std::vector<std::string> expandedArgs;
@@ -129,11 +129,11 @@ bool cmFunctionHelperCommand::InvokeInitialPass(
   for (unsigned int c = 0; c < this->Functions.size(); ++c) {
     cmExecutionStatus status;
     if (!this->Makefile->ExecuteCommand(this->Functions[c], status) ||
-        status.GetNestedError()) {
+        (cmSystemTools::GetErrorOccuredFlag() &&
+         !cmSystemTools::GetFatalErrorOccured())) {
       // The error message should have already included the call stack
       // so we do not need to report an error here.
       functionScope.Quiet();
-      inStatus.SetNestedError(true);
       return false;
     }
     if (status.GetReturnInvoked()) {
diff --git a/Source/cmListFileCache.cxx b/Source/cmListFileCache.cxx
index 1967d2a..39d9e97 100644
--- a/Source/cmListFileCache.cxx
+++ b/Source/cmListFileCache.cxx
@@ -12,7 +12,7 @@
 #include "cmListFileCache.h"
 
 #include "cmListFileLexer.h"
-#include "cmMakefile.h"
+#include "cmMessenger.h"
 #include "cmOutputConverter.h"
 #include "cmSystemTools.h"
 #include "cmVersion.h"
@@ -21,15 +21,18 @@
 
 struct cmListFileParser
 {
-  cmListFileParser(cmListFile* lf, cmMakefile* mf, const char* filename);
+  cmListFileParser(cmListFile* lf, cmListFileBacktrace lfbt,
+                   cmMessenger* messenger, const char* filename);
   ~cmListFileParser();
   void IssueFileOpenError(std::string const& text) const;
+  void IssueError(std::string const& text) const;
   bool ParseFile();
   bool ParseFunction(const char* name, long line);
   bool AddArgument(cmListFileLexer_Token* token,
                    cmListFileArgument::Delimiter delim);
   cmListFile* ListFile;
-  cmMakefile* Makefile;
+  cmListFileBacktrace Backtrace;
+  cmMessenger* Messenger;
   const char* FileName;
   cmListFileLexer* Lexer;
   cmListFileFunction Function;
@@ -41,10 +44,12 @@ struct cmListFileParser
   } Separation;
 };
 
-cmListFileParser::cmListFileParser(cmListFile* lf, cmMakefile* mf,
+cmListFileParser::cmListFileParser(cmListFile* lf, cmListFileBacktrace lfbt,
+                                   cmMessenger* messenger,
                                    const char* filename)
   : ListFile(lf)
-  , Makefile(mf)
+  , Backtrace(lfbt)
+  , Messenger(messenger)
   , FileName(filename)
   , Lexer(cmListFileLexer_New())
 {
@@ -57,7 +62,18 @@ cmListFileParser::~cmListFileParser()
 
 void cmListFileParser::IssueFileOpenError(const std::string& text) const
 {
-  this->Makefile->IssueMessage(cmake::FATAL_ERROR, text);
+  this->Messenger->IssueMessage(cmake::FATAL_ERROR, text, this->Backtrace);
+}
+
+void cmListFileParser::IssueError(const std::string& text) const
+{
+  cmListFileContext lfc;
+  lfc.FilePath = this->FileName;
+  lfc.Line = cmListFileLexer_GetCurrentLine(this->Lexer);
+  cmListFileBacktrace lfbt = this->Backtrace;
+  lfbt = lfbt.Push(lfc);
+  this->Messenger->IssueMessage(cmake::FATAL_ERROR, text, lfbt);
+  cmSystemTools::SetFatalErrorOccured();
 }
 
 bool cmListFileParser::ParseFile()
@@ -96,29 +112,26 @@ bool cmListFileParser::ParseFile()
         }
       } else {
         std::ostringstream error;
-        error << "Error in cmake code at\n"
-              << this->FileName << ":" << token->line << ":\n"
-              << "Parse error.  Expected a newline, got "
+        error << "Parse error.  Expected a newline, got "
               << cmListFileLexer_GetTypeAsString(this->Lexer, token->type)
               << " with text \"" << token->text << "\".";
-        cmSystemTools::Error(error.str().c_str());
+        this->IssueError(error.str());
         return false;
       }
     } else {
       std::ostringstream error;
-      error << "Error in cmake code at\n"
-            << this->FileName << ":" << token->line << ":\n"
-            << "Parse error.  Expected a command name, got "
+      error << "Parse error.  Expected a command name, got "
             << cmListFileLexer_GetTypeAsString(this->Lexer, token->type)
             << " with text \"" << token->text << "\".";
-      cmSystemTools::Error(error.str().c_str());
+      this->IssueError(error.str());
       return false;
     }
   }
   return true;
 }
 
-bool cmListFile::ParseFile(const char* filename, cmMakefile* mf)
+bool cmListFile::ParseFile(const char* filename, cmMessenger* messenger,
+                           cmListFileBacktrace const& lfbt)
 {
   if (!cmSystemTools::FileExists(filename) ||
       cmSystemTools::FileIsDirectory(filename)) {
@@ -128,7 +141,7 @@ bool cmListFile::ParseFile(const char* filename, cmMakefile* mf)
   bool parseError = false;
 
   {
-    cmListFileParser parser(this, mf, filename);
+    cmListFileParser parser(this, lfbt, messenger, filename);
     parseError = !parser.ParseFile();
   }
 
@@ -154,18 +167,15 @@ bool cmListFileParser::ParseFunction(const char* name, long line)
           << cmListFileLexer_GetCurrentLine(this->Lexer) << ":\n"
           << "Parse error.  Function missing opening \"(\".";
     /* clang-format on */
-    cmSystemTools::Error(error.str().c_str());
+    this->IssueError(error.str());
     return false;
   }
   if (token->type != cmListFileLexer_Token_ParenLeft) {
     std::ostringstream error;
-    error << "Error in cmake code at\n"
-          << this->FileName << ":"
-          << cmListFileLexer_GetCurrentLine(this->Lexer) << ":\n"
-          << "Parse error.  Expected \"(\", got "
+    error << "Parse error.  Expected \"(\", got "
           << cmListFileLexer_GetTypeAsString(this->Lexer, token->type)
           << " with text \"" << token->text << "\".";
-    cmSystemTools::Error(error.str().c_str());
+    this->IssueError(error.str());
     return false;
   }
 
@@ -217,25 +227,24 @@ bool cmListFileParser::ParseFunction(const char* name, long line)
     } else {
       // Error.
       std::ostringstream error;
-      error << "Error in cmake code at\n"
-            << this->FileName << ":"
-            << cmListFileLexer_GetCurrentLine(this->Lexer) << ":\n"
-            << "Parse error.  Function missing ending \")\".  "
+      error << "Parse error.  Function missing ending \")\".  "
             << "Instead found "
             << cmListFileLexer_GetTypeAsString(this->Lexer, token->type)
             << " with text \"" << token->text << "\".";
-      cmSystemTools::Error(error.str().c_str());
+      this->IssueError(error.str());
       return false;
     }
   }
 
   std::ostringstream error;
-  error << "Error in cmake code at\n"
-        << this->FileName << ":" << lastLine << ":\n"
-        << "Parse error.  Function missing ending \")\".  "
+  cmListFileContext lfc;
+  lfc.FilePath = this->FileName;
+  lfc.Line = lastLine;
+  cmListFileBacktrace lfbt = this->Backtrace;
+  lfbt = lfbt.Push(lfc);
+  error << "Parse error.  Function missing ending \")\".  "
         << "End of file reached.";
-  cmSystemTools::Error(error.str().c_str());
-
+  this->Messenger->IssueMessage(cmake::FATAL_ERROR, error.str(), lfbt);
   return false;
 }
 
@@ -250,17 +259,21 @@ bool cmListFileParser::AddArgument(cmListFileLexer_Token* token,
   bool isError = (this->Separation == SeparationError ||
                   delim == cmListFileArgument::Bracket);
   std::ostringstream m;
-  /* clang-format off */
-  m << "Syntax " << (isError? "Error":"Warning") << " in cmake code at\n"
-    << "  " << this->FileName << ":" << token->line << ":"
-    << token->column << "\n"
+  cmListFileContext lfc;
+  lfc.FilePath = this->FileName;
+  lfc.Line = token->line;
+  cmListFileBacktrace lfbt = this->Backtrace;
+  lfbt = lfbt.Push(lfc);
+
+  m << "Syntax " << (isError ? "Error" : "Warning") << " in cmake code at "
+    << "column " << token->column << "\n"
     << "Argument not separated from preceding token by whitespace.";
   /* clang-format on */
   if (isError) {
-    this->Makefile->IssueMessage(cmake::FATAL_ERROR, m.str());
+    this->Messenger->IssueMessage(cmake::FATAL_ERROR, m.str(), lfbt);
     return false;
   }
-  this->Makefile->IssueMessage(cmake::AUTHOR_WARNING, m.str());
+  this->Messenger->IssueMessage(cmake::AUTHOR_WARNING, m.str(), lfbt);
   return true;
 }
 
diff --git a/Source/cmListFileCache.h b/Source/cmListFileCache.h
index f3e6f70..cd44536 100644
--- a/Source/cmListFileCache.h
+++ b/Source/cmListFileCache.h
@@ -23,7 +23,7 @@
  * cmake list files.
  */
 
-class cmMakefile;
+class cmMessenger;
 
 struct cmCommandContext
 {
@@ -158,7 +158,8 @@ private:
 
 struct cmListFile
 {
-  bool ParseFile(const char* path, cmMakefile* mf);
+  bool ParseFile(const char* path, cmMessenger* messenger,
+                 cmListFileBacktrace const& lfbt);
 
   std::vector<cmListFileFunction> Functions;
 };
diff --git a/Source/cmMacroCommand.cxx b/Source/cmMacroCommand.cxx
index ee9dc8a..9d312ee 100644
--- a/Source/cmMacroCommand.cxx
+++ b/Source/cmMacroCommand.cxx
@@ -159,11 +159,11 @@ bool cmMacroHelperCommand::InvokeInitialPass(
     }
     cmExecutionStatus status;
     if (!this->Makefile->ExecuteCommand(newLFF, status) ||
-        status.GetNestedError()) {
+        (cmSystemTools::GetErrorOccuredFlag() &&
+         !cmSystemTools::GetFatalErrorOccured())) {
       // The error message should have already included the call stack
       // so we do not need to report an error here.
       macroScope.Quiet();
-      inStatus.SetNestedError(true);
       return false;
     }
     if (status.GetReturnInvoked()) {
diff --git a/Source/cmMakefile.cxx b/Source/cmMakefile.cxx
index b9d71ec..6e47797 100644
--- a/Source/cmMakefile.cxx
+++ b/Source/cmMakefile.cxx
@@ -25,6 +25,7 @@
 #include "cmGlobalGenerator.h"
 #include "cmInstallGenerator.h"
 #include "cmListFileCache.h"
+#include "cmMessenger.h"
 #include "cmSourceFile.h"
 #include "cmSourceFileLocation.h"
 #include "cmState.h"
@@ -115,12 +116,6 @@ cmMakefile::~cmMakefile()
 void cmMakefile::IssueMessage(cmake::MessageType t,
                               std::string const& text) const
 {
-  // Collect context information.
-  if (!this->ExecutionStatusStack.empty()) {
-    if ((t == cmake::FATAL_ERROR) || (t == cmake::INTERNAL_ERROR)) {
-      this->ExecutionStatusStack.back()->SetNestedError(true);
-    }
-  }
   this->GetCMakeInstance()->IssueMessage(t, text, this->GetBacktrace());
 }
 
@@ -281,11 +276,19 @@ bool cmMakefile::ExecuteCommand(const cmListFileFunction& lff,
       if (this->GetCMakeInstance()->GetTrace()) {
         this->PrintCommandTrace(lff);
       }
-      // Try invoking the command.
+
+      bool hadPreviousNonFatalError = cmSystemTools::GetErrorOccuredFlag() &&
+        !cmSystemTools::GetFatalErrorOccured();
+      cmSystemTools::ResetErrorOccuredFlag();
+
       bool invokeSucceeded = pcmd->InvokeInitialPass(lff.Arguments, status);
-      bool hadNestedError = status.GetNestedError();
+      bool hadNestedError = cmSystemTools::GetErrorOccuredFlag() &&
+        !cmSystemTools::GetFatalErrorOccured();
+      if (hadPreviousNonFatalError) {
+        cmSystemTools::SetErrorOccured();
+      }
       if (!invokeSucceeded || hadNestedError) {
-        if (!hadNestedError) {
+        if (!hadNestedError && !cmSystemTools::GetFatalErrorOccured()) {
           // The command invocation requested that we report an error.
           this->IssueMessage(cmake::FATAL_ERROR, pcmd->GetError());
         }
@@ -455,7 +458,8 @@ bool cmMakefile::ReadDependentFile(const char* filename, bool noPolicyScope)
   IncludeScope incScope(this, filenametoread, noPolicyScope);
 
   cmListFile listFile;
-  if (!listFile.ParseFile(filenametoread.c_str(), this)) {
+  if (!listFile.ParseFile(filenametoread.c_str(), this->GetMessenger(),
+                          this->Backtrace)) {
     return false;
   }
 
@@ -504,7 +508,8 @@ bool cmMakefile::ReadListFile(const char* filename)
   ListFileScope scope(this, filenametoread);
 
   cmListFile listFile;
-  if (!listFile.ParseFile(filenametoread.c_str(), this)) {
+  if (!listFile.ParseFile(filenametoread.c_str(), this->GetMessenger(),
+                          this->Backtrace)) {
     return false;
   }
 
@@ -1450,7 +1455,8 @@ void cmMakefile::Configure()
   this->AddDefinition("CMAKE_PARENT_LIST_FILE", currentStart.c_str());
 
   cmListFile listFile;
-  if (!listFile.ParseFile(currentStart.c_str(), this)) {
+  if (!listFile.ParseFile(currentStart.c_str(), this->GetMessenger(),
+                          this->Backtrace)) {
     return;
   }
   if (this->IsRootMakefile()) {
@@ -3272,6 +3278,11 @@ cmake* cmMakefile::GetCMakeInstance() const
   return this->GlobalGenerator->GetCMakeInstance();
 }
 
+cmMessenger* cmMakefile::GetMessenger() const
+{
+  return this->GetCMakeInstance()->GetMessenger();
+}
+
 cmGlobalGenerator* cmMakefile::GetGlobalGenerator() const
 {
   return this->GlobalGenerator;
diff --git a/Source/cmMakefile.h b/Source/cmMakefile.h
index d082964..b3587c5 100644
--- a/Source/cmMakefile.h
+++ b/Source/cmMakefile.h
@@ -607,6 +607,7 @@ public:
    * Get the instance
    */
   cmake* GetCMakeInstance() const;
+  cmMessenger* GetMessenger() const;
   cmGlobalGenerator* GetGlobalGenerator() const;
 
   /**
diff --git a/Source/cmMessageCommand.cxx b/Source/cmMessageCommand.cxx
index 080880b..c48910e 100644
--- a/Source/cmMessageCommand.cxx
+++ b/Source/cmMessageCommand.cxx
@@ -11,6 +11,8 @@
 ============================================================================*/
 #include "cmMessageCommand.h"
 
+#include "cmMessenger.h"
+
 // cmLibraryCommand
 bool cmMessageCommand::InitialPass(std::vector<std::string> const& args,
                                    cmExecutionStatus&)
@@ -65,8 +67,8 @@ bool cmMessageCommand::InitialPass(std::vector<std::string> const& args,
 
   if (type != cmake::MESSAGE) {
     // we've overriden the message type, above, so display it directly
-    cmake* cm = this->Makefile->GetCMakeInstance();
-    cm->DisplayMessage(type, message, this->Makefile->GetBacktrace());
+    cmMessenger* m = this->Makefile->GetMessenger();
+    m->DisplayMessage(type, message, this->Makefile->GetBacktrace());
   } else {
     if (status) {
       this->Makefile->DisplayStatus(message.c_str(), -1);
diff --git a/Source/cmMessenger.cxx b/Source/cmMessenger.cxx
new file mode 100644
index 0000000..43fa150
--- /dev/null
+++ b/Source/cmMessenger.cxx
@@ -0,0 +1,209 @@
+/*============================================================================
+  CMake - Cross Platform Makefile Generator
+  Copyright 2000-2009 Kitware, Inc., Insight Software Consortium
+
+  Distributed under the OSI-approved BSD License (the "License");
+  see accompanying file Copyright.txt for details.
+
+  This software is distributed WITHOUT ANY WARRANTY; without even the
+  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the License for more information.
+============================================================================*/
+
+#include "cmMessenger.h"
+#include "cmDocumentationFormatter.h"
+#include "cmMessenger.h"
+#include "cmOutputConverter.h"
+
+#if defined(CMAKE_BUILD_WITH_CMAKE)
+#include <cmsys/SystemInformation.hxx>
+#endif
+
+cmake::MessageType cmMessenger::ConvertMessageType(cmake::MessageType t) const
+{
+  bool warningsAsErrors;
+
+  if (t == cmake::AUTHOR_WARNING || t == cmake::AUTHOR_ERROR) {
+    warningsAsErrors = this->GetDevWarningsAsErrors();
+    if (warningsAsErrors && t == cmake::AUTHOR_WARNING) {
+      t = cmake::AUTHOR_ERROR;
+    } else if (!warningsAsErrors && t == cmake::AUTHOR_ERROR) {
+      t = cmake::AUTHOR_WARNING;
+    }
+  } else if (t == cmake::DEPRECATION_WARNING ||
+             t == cmake::DEPRECATION_ERROR) {
+    warningsAsErrors = this->GetDeprecatedWarningsAsErrors();
+    if (warningsAsErrors && t == cmake::DEPRECATION_WARNING) {
+      t = cmake::DEPRECATION_ERROR;
+    } else if (!warningsAsErrors && t == cmake::DEPRECATION_ERROR) {
+      t = cmake::DEPRECATION_WARNING;
+    }
+  }
+
+  return t;
+}
+
+bool cmMessenger::IsMessageTypeVisible(cmake::MessageType t) const
+{
+  bool isVisible = true;
+
+  if (t == cmake::DEPRECATION_ERROR) {
+    if (!this->GetDeprecatedWarningsAsErrors()) {
+      isVisible = false;
+    }
+  } else if (t == cmake::DEPRECATION_WARNING) {
+    if (this->GetSuppressDeprecatedWarnings()) {
+      isVisible = false;
+    }
+  } else if (t == cmake::AUTHOR_ERROR) {
+    if (!this->GetDevWarningsAsErrors()) {
+      isVisible = false;
+    }
+  } else if (t == cmake::AUTHOR_WARNING) {
+    if (this->GetSuppressDevWarnings()) {
+      isVisible = false;
+    }
+  }
+
+  return isVisible;
+}
+
+static bool printMessagePreamble(cmake::MessageType t, std::ostream& msg)
+{
+  // Construct the message header.
+  if (t == cmake::FATAL_ERROR) {
+    msg << "CMake Error";
+  } else if (t == cmake::INTERNAL_ERROR) {
+    msg << "CMake Internal Error (please report a bug)";
+  } else if (t == cmake::LOG) {
+    msg << "CMake Debug Log";
+  } else if (t == cmake::DEPRECATION_ERROR) {
+    msg << "CMake Deprecation Error";
+  } else if (t == cmake::DEPRECATION_WARNING) {
+    msg << "CMake Deprecation Warning";
+  } else if (t == cmake::AUTHOR_WARNING) {
+    msg << "CMake Warning (dev)";
+  } else if (t == cmake::AUTHOR_ERROR) {
+    msg << "CMake Error (dev)";
+  } else {
+    msg << "CMake Warning";
+  }
+  return true;
+}
+
+void printMessageText(std::ostream& msg, std::string const& text)
+{
+  msg << ":\n";
+  cmDocumentationFormatter formatter;
+  formatter.SetIndent("  ");
+  formatter.PrintFormatted(msg, text.c_str());
+}
+
+void displayMessage(cmake::MessageType t, std::ostringstream& msg)
+{
+  // Add a note about warning suppression.
+  if (t == cmake::AUTHOR_WARNING) {
+    msg << "This warning is for project developers.  Use -Wno-dev to suppress "
+           "it.";
+  } else if (t == cmake::AUTHOR_ERROR) {
+    msg << "This error is for project developers. Use -Wno-error=dev to "
+           "suppress "
+           "it.";
+  }
+
+  // Add a terminating blank line.
+  msg << "\n";
+
+#if defined(CMAKE_BUILD_WITH_CMAKE)
+  // Add a C++ stack trace to internal errors.
+  if (t == cmake::INTERNAL_ERROR) {
+    std::string stack = cmsys::SystemInformation::GetProgramStack(0, 0);
+    if (!stack.empty()) {
+      if (cmHasLiteralPrefix(stack, "WARNING:")) {
+        stack = "Note:" + stack.substr(8);
+      }
+      msg << stack << "\n";
+    }
+  }
+#endif
+
+  // Output the message.
+  if (t == cmake::FATAL_ERROR || t == cmake::INTERNAL_ERROR ||
+      t == cmake::DEPRECATION_ERROR || t == cmake::AUTHOR_ERROR) {
+    cmSystemTools::SetErrorOccured();
+    cmSystemTools::Message(msg.str().c_str(), "Error");
+  } else {
+    cmSystemTools::Message(msg.str().c_str(), "Warning");
+  }
+}
+
+cmMessenger::cmMessenger(cmState* state)
+  : State(state)
+{
+}
+
+void cmMessenger::IssueMessage(cmake::MessageType t, const std::string& text,
+                               const cmListFileBacktrace& backtrace) const
+{
+  bool force = false;
+  if (!force) {
+    // override the message type, if needed, for warnings and errors
+    cmake::MessageType override = this->ConvertMessageType(t);
+    if (override != t) {
+      t = override;
+      force = true;
+    }
+  }
+
+  if (!force && !this->IsMessageTypeVisible(t)) {
+    return;
+  }
+  this->DisplayMessage(t, text, backtrace);
+}
+
+void cmMessenger::DisplayMessage(cmake::MessageType t, const std::string& text,
+                                 const cmListFileBacktrace& backtrace) const
+{
+  std::ostringstream msg;
+  if (!printMessagePreamble(t, msg)) {
+    return;
+  }
+
+  // Add the immediate context.
+  backtrace.PrintTitle(msg);
+
+  printMessageText(msg, text);
+
+  // Add the rest of the context.
+  backtrace.PrintCallStack(msg);
+
+  displayMessage(t, msg);
+}
+
+bool cmMessenger::GetSuppressDevWarnings() const
+{
+  const char* cacheEntryValue =
+    this->State->GetCacheEntryValue("CMAKE_SUPPRESS_DEVELOPER_WARNINGS");
+  return cmSystemTools::IsOn(cacheEntryValue);
+}
+
+bool cmMessenger::GetSuppressDeprecatedWarnings() const
+{
+  const char* cacheEntryValue =
+    this->State->GetCacheEntryValue("CMAKE_WARN_DEPRECATED");
+  return cacheEntryValue && cmSystemTools::IsOff(cacheEntryValue);
+}
+
+bool cmMessenger::GetDevWarningsAsErrors() const
+{
+  const char* cacheEntryValue =
+    this->State->GetCacheEntryValue("CMAKE_SUPPRESS_DEVELOPER_ERRORS");
+  return cacheEntryValue && cmSystemTools::IsOff(cacheEntryValue);
+}
+
+bool cmMessenger::GetDeprecatedWarningsAsErrors() const
+{
+  const char* cacheEntryValue =
+    this->State->GetCacheEntryValue("CMAKE_ERROR_DEPRECATED");
+  return cmSystemTools::IsOn(cacheEntryValue);
+}
diff --git a/Source/cmMessenger.h b/Source/cmMessenger.h
new file mode 100644
index 0000000..f15bf13
--- /dev/null
+++ b/Source/cmMessenger.h
@@ -0,0 +1,44 @@
+/*============================================================================
+  CMake - Cross Platform Makefile Generator
+  Copyright 2000-2009 Kitware, Inc., Insight Software Consortium
+
+  Distributed under the OSI-approved BSD License (the "License");
+  see accompanying file Copyright.txt for details.
+
+  This software is distributed WITHOUT ANY WARRANTY; without even the
+  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the License for more information.
+============================================================================*/
+
+#ifndef cmMessenger_h
+#define cmMessenger_h
+
+#include "cmListFileCache.h"
+#include "cmState.h"
+#include "cmake.h"
+
+class cmMessenger
+{
+public:
+  cmMessenger(cmState* state);
+
+  void IssueMessage(
+    cmake::MessageType t, std::string const& text,
+    cmListFileBacktrace const& backtrace = cmListFileBacktrace()) const;
+
+  void DisplayMessage(cmake::MessageType t, std::string const& text,
+                      cmListFileBacktrace const& backtrace) const;
+
+  bool GetSuppressDevWarnings() const;
+  bool GetSuppressDeprecatedWarnings() const;
+  bool GetDevWarningsAsErrors() const;
+  bool GetDeprecatedWarningsAsErrors() const;
+
+private:
+  bool IsMessageTypeVisible(cmake::MessageType t) const;
+  cmake::MessageType ConvertMessageType(cmake::MessageType t) const;
+
+  cmState* State;
+};
+
+#endif
diff --git a/Source/cmake.cxx b/Source/cmake.cxx
index 74c3f71..701a5e5 100644
--- a/Source/cmake.cxx
+++ b/Source/cmake.cxx
@@ -19,6 +19,7 @@
 #include "cmFileTimeComparison.h"
 #include "cmLocalGenerator.h"
 #include "cmMakefile.h"
+#include "cmMessenger.h"
 #include "cmSourceFile.h"
 #include "cmState.h"
 #include "cmTest.h"
@@ -152,6 +153,7 @@ cmake::cmake()
 
   this->State = new cmState;
   this->CurrentSnapshot = this->State->CreateBaseSnapshot();
+  this->Messenger = new cmMessenger(this->State);
 
 #ifdef __APPLE__
   struct rlimit rlp;
@@ -207,6 +209,7 @@ cmake::cmake()
 cmake::~cmake()
 {
   delete this->State;
+  delete this->Messenger;
   if (this->GlobalGenerator) {
     delete this->GlobalGenerator;
     this->GlobalGenerator = CM_NULLPTR;
@@ -2281,160 +2284,10 @@ static bool cmakeCheckStampList(const char* stampList)
   return true;
 }
 
-cmake::MessageType cmake::ConvertMessageType(cmake::MessageType t) const
-{
-  bool warningsAsErrors;
-
-  if (t == cmake::AUTHOR_WARNING || t == cmake::AUTHOR_ERROR) {
-    warningsAsErrors = this->GetDevWarningsAsErrors();
-    if (warningsAsErrors && t == cmake::AUTHOR_WARNING) {
-      t = cmake::AUTHOR_ERROR;
-    } else if (!warningsAsErrors && t == cmake::AUTHOR_ERROR) {
-      t = cmake::AUTHOR_WARNING;
-    }
-  } else if (t == cmake::DEPRECATION_WARNING ||
-             t == cmake::DEPRECATION_ERROR) {
-    warningsAsErrors = this->GetDeprecatedWarningsAsErrors();
-    if (warningsAsErrors && t == cmake::DEPRECATION_WARNING) {
-      t = cmake::DEPRECATION_ERROR;
-    } else if (!warningsAsErrors && t == cmake::DEPRECATION_ERROR) {
-      t = cmake::DEPRECATION_WARNING;
-    }
-  }
-
-  return t;
-}
-
-bool cmake::IsMessageTypeVisible(cmake::MessageType t) const
-{
-  bool isVisible = true;
-
-  if (t == cmake::DEPRECATION_ERROR) {
-    if (!this->GetDeprecatedWarningsAsErrors()) {
-      isVisible = false;
-    }
-  } else if (t == cmake::DEPRECATION_WARNING) {
-    if (this->GetSuppressDeprecatedWarnings()) {
-      isVisible = false;
-    }
-  } else if (t == cmake::AUTHOR_ERROR) {
-    if (!this->GetDevWarningsAsErrors()) {
-      isVisible = false;
-    }
-  } else if (t == cmake::AUTHOR_WARNING) {
-    if (this->GetSuppressDevWarnings()) {
-      isVisible = false;
-    }
-  }
-
-  return isVisible;
-}
-
-static bool printMessagePreamble(cmake::MessageType t, std::ostream& msg)
-{
-  // Construct the message header.
-  if (t == cmake::FATAL_ERROR) {
-    msg << "CMake Error";
-  } else if (t == cmake::INTERNAL_ERROR) {
-    msg << "CMake Internal Error (please report a bug)";
-  } else if (t == cmake::LOG) {
-    msg << "CMake Debug Log";
-  } else if (t == cmake::DEPRECATION_ERROR) {
-    msg << "CMake Deprecation Error";
-  } else if (t == cmake::DEPRECATION_WARNING) {
-    msg << "CMake Deprecation Warning";
-  } else if (t == cmake::AUTHOR_WARNING) {
-    msg << "CMake Warning (dev)";
-  } else if (t == cmake::AUTHOR_ERROR) {
-    msg << "CMake Error (dev)";
-  } else {
-    msg << "CMake Warning";
-  }
-  return true;
-}
-
-void printMessageText(std::ostream& msg, std::string const& text)
-{
-  msg << ":\n";
-  cmDocumentationFormatter formatter;
-  formatter.SetIndent("  ");
-  formatter.PrintFormatted(msg, text.c_str());
-}
-
-void displayMessage(cmake::MessageType t, std::ostringstream& msg)
-{
-
-  // Add a note about warning suppression.
-  if (t == cmake::AUTHOR_WARNING) {
-    msg << "This warning is for project developers.  Use -Wno-dev to suppress "
-           "it.";
-  } else if (t == cmake::AUTHOR_ERROR) {
-    msg << "This error is for project developers. Use -Wno-error=dev to "
-           "suppress "
-           "it.";
-  }
-
-  // Add a terminating blank line.
-  msg << "\n";
-
-#if defined(CMAKE_BUILD_WITH_CMAKE)
-  // Add a C++ stack trace to internal errors.
-  if (t == cmake::INTERNAL_ERROR) {
-    std::string stack = cmsys::SystemInformation::GetProgramStack(0, 0);
-    if (!stack.empty()) {
-      if (cmHasLiteralPrefix(stack, "WARNING:")) {
-        stack = "Note:" + stack.substr(8);
-      }
-      msg << stack << "\n";
-    }
-  }
-#endif
-
-  // Output the message.
-  if (t == cmake::FATAL_ERROR || t == cmake::INTERNAL_ERROR ||
-      t == cmake::DEPRECATION_ERROR || t == cmake::AUTHOR_ERROR) {
-    cmSystemTools::SetErrorOccured();
-    cmSystemTools::Message(msg.str().c_str(), "Error");
-  } else {
-    cmSystemTools::Message(msg.str().c_str(), "Warning");
-  }
-}
-
 void cmake::IssueMessage(cmake::MessageType t, std::string const& text,
                          cmListFileBacktrace const& backtrace) const
 {
-  bool force = false;
-  // override the message type, if needed, for warnings and errors
-  cmake::MessageType override = this->ConvertMessageType(t);
-  if (override != t) {
-    t = override;
-    force = true;
-  }
-
-  if (!force && !this->IsMessageTypeVisible(t)) {
-    return;
-  }
-
-  this->DisplayMessage(t, text, backtrace);
-}
-
-void cmake::DisplayMessage(cmake::MessageType t, std::string const& text,
-                           cmListFileBacktrace const& backtrace) const
-{
-  std::ostringstream msg;
-  if (!printMessagePreamble(t, msg)) {
-    return;
-  }
-
-  // Add the immediate context.
-  backtrace.PrintTitle(msg);
-
-  printMessageText(msg, text);
-
-  // Add the rest of the context.
-  backtrace.PrintCallStack(msg);
-
-  displayMessage(t, msg);
+  this->Messenger->IssueMessage(t, text, backtrace);
 }
 
 std::vector<std::string> cmake::GetDebugConfigs()
@@ -2454,6 +2307,11 @@ std::vector<std::string> cmake::GetDebugConfigs()
   return configs;
 }
 
+cmMessenger* cmake::GetMessenger() const
+{
+  return this->Messenger;
+}
+
 int cmake::Build(const std::string& dir, const std::string& target,
                  const std::string& config,
                  const std::vector<std::string>& nativeOptions, bool clean)
@@ -2560,9 +2418,7 @@ void cmake::RunCheckForUnusedVariables()
 
 bool cmake::GetSuppressDevWarnings() const
 {
-  const char* cacheEntryValue =
-    this->State->GetCacheEntryValue("CMAKE_SUPPRESS_DEVELOPER_WARNINGS");
-  return cmSystemTools::IsOn(cacheEntryValue);
+  return this->Messenger->GetSuppressDevWarnings();
 }
 
 void cmake::SetSuppressDevWarnings(bool b)
@@ -2586,9 +2442,7 @@ void cmake::SetSuppressDevWarnings(bool b)
 
 bool cmake::GetSuppressDeprecatedWarnings() const
 {
-  const char* cacheEntryValue =
-    this->State->GetCacheEntryValue("CMAKE_WARN_DEPRECATED");
-  return cacheEntryValue && cmSystemTools::IsOff(cacheEntryValue);
+  return this->Messenger->GetSuppressDeprecatedWarnings();
 }
 
 void cmake::SetSuppressDeprecatedWarnings(bool b)
@@ -2612,9 +2466,7 @@ void cmake::SetSuppressDeprecatedWarnings(bool b)
 
 bool cmake::GetDevWarningsAsErrors() const
 {
-  const char* cacheEntryValue =
-    this->State->GetCacheEntryValue("CMAKE_SUPPRESS_DEVELOPER_ERRORS");
-  return cacheEntryValue && cmSystemTools::IsOff(cacheEntryValue);
+  return this->Messenger->GetDevWarningsAsErrors();
 }
 
 void cmake::SetDevWarningsAsErrors(bool b)
@@ -2638,9 +2490,7 @@ void cmake::SetDevWarningsAsErrors(bool b)
 
 bool cmake::GetDeprecatedWarningsAsErrors() const
 {
-  const char* cacheEntryValue =
-    this->State->GetCacheEntryValue("CMAKE_ERROR_DEPRECATED");
-  return cmSystemTools::IsOn(cacheEntryValue);
+  return this->Messenger->GetDeprecatedWarningsAsErrors();
 }
 
 void cmake::SetDeprecatedWarningsAsErrors(bool b)
diff --git a/Source/cmake.h b/Source/cmake.h
index 343d371..dbe936b 100644
--- a/Source/cmake.h
+++ b/Source/cmake.h
@@ -25,6 +25,7 @@ class cmGlobalGeneratorFactory;
 class cmGlobalGenerator;
 class cmLocalGenerator;
 class cmMakefile;
+class cmMessenger;
 class cmVariableWatch;
 class cmFileTimeComparison;
 class cmExternalMakefileProjectGeneratorFactory;
@@ -346,6 +347,8 @@ public:
     return this->CMakeEditCommand;
   }
 
+  cmMessenger* GetMessenger() const;
+
   /*
    * Get the state of the suppression of developer (author) warnings.
    * Returns false, by default, if developer warnings should be shown, true
@@ -395,9 +398,6 @@ public:
     cmake::MessageType t, std::string const& text,
     cmListFileBacktrace const& backtrace = cmListFileBacktrace()) const;
 
-  void DisplayMessage(cmake::MessageType t, std::string const& text,
-                      cmListFileBacktrace const& backtrace) const;
-
   ///! run the --build option
   int Build(const std::string& dir, const std::string& target,
             const std::string& config,
@@ -491,6 +491,7 @@ private:
 
   cmState* State;
   cmState::Snapshot CurrentSnapshot;
+  cmMessenger* Messenger;
 
   std::vector<std::string> TraceOnlyThisSources;