/*=========================================================================

  Program:   CMake - Cross-Platform Makefile Generator
  Module:    $RCSfile$
  Language:  C++
  Date:      $Date$
  Version:   $Revision$

  Copyright (c) 2002 Kitware, Inc., Insight Consortium.  All rights reserved.
  See Copyright.txt or http://www.cmake.org/HTML/Copyright.html for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notices for more information.

=========================================================================*/
#include "cmLocalUnixMakefileGenerator2.h"

#include "cmDepends.h"
#include "cmGeneratedFileStream.h"
#include "cmGlobalGenerator.h"
#include "cmMakefile.h"
#include "cmSourceFile.h"
#include "cmake.h"

// Include dependency scanners for supported languages.  Only the
// C/C++ scanner is needed for bootstrapping CMake.
#include "cmDependsC.h"
#ifdef CMAKE_BUILD_WITH_CMAKE
# include "cmDependsFortran.h"
#endif

#include <memory> // auto_ptr
#include <queue>

#include <assert.h>

// Quick-switch for generating old makefiles.
#if 1
# define CMLUMG_MAKEFILE_NAME "Makefile"
#else
# define CMLUMG_WRITE_OLD_MAKEFILE
# define CMLUMG_MAKEFILE_NAME "Makefile2"
#endif

// TODO: Add "help" target.
// TODO: Identify remaining relative path violations.
// TODO: Need test for separate executable/library output path.

//----------------------------------------------------------------------------
cmLocalUnixMakefileGenerator2::cmLocalUnixMakefileGenerator2()
{
}

//----------------------------------------------------------------------------
cmLocalUnixMakefileGenerator2::~cmLocalUnixMakefileGenerator2()
{
}

//----------------------------------------------------------------------------
void cmLocalUnixMakefileGenerator2::SetEmptyCommand(const char* cmd)
{
  m_EmptyCommands.clear();
  if(cmd)
    {
    m_EmptyCommands.push_back(cmd);
    }
}

//----------------------------------------------------------------------------
void cmLocalUnixMakefileGenerator2::Generate(bool fromTheTop)
{
#ifdef CMLUMG_WRITE_OLD_MAKEFILE
  // Generate old style for now.
  this->cmLocalUnixMakefileGenerator::Generate(fromTheTop);
#else
  // Make sure we never run a local generate.
  if(!fromTheTop)
    {
    cmSystemTools::Error("Local generate invoked in ",
                         m_Makefile->GetStartOutputDirectory());
    return;
    }

  // Handle EXECUTABLE_OUTPUT_PATH and LIBRARY_OUTPUT_PATH since
  // superclass generator is not called.
  this->ConfigureOutputPaths();
#endif

  // Generate the rule files for each target.
  const cmTargets& targets = m_Makefile->GetTargets();
  for(cmTargets::const_iterator t = targets.begin(); t != targets.end(); ++t)
    {
    // TODO: Dispatch generation of each target type.
    if((t->second.GetType() == cmTarget::EXECUTABLE) ||
       (t->second.GetType() == cmTarget::STATIC_LIBRARY) ||
       (t->second.GetType() == cmTarget::SHARED_LIBRARY) ||
       (t->second.GetType() == cmTarget::MODULE_LIBRARY))
      {
      this->GenerateTargetRuleFile(t->second);
      }
    else if(t->second.GetType() == cmTarget::UTILITY)
      {
      this->GenerateUtilityRuleFile(t->second);
      }
    }

  // Generate the rule files for each custom command.
  const std::vector<cmSourceFile*>& sources = m_Makefile->GetSourceFiles();
  for(std::vector<cmSourceFile*>::const_iterator i = sources.begin();
      i != sources.end(); ++i)
    {
    if(const cmCustomCommand* cc = (*i)->GetCustomCommand())
      {
      this->GenerateCustomRuleFile(*cc);
      }
    }

  // Generate the main makefile.
  this->GenerateMakefile();

  // Generate the cmake file that keeps the makefile up to date.
  this->GenerateCMakefile();

  // Generate the cmake file with information for this directory.
  this->GenerateDirectoryInformationFile();
}

//----------------------------------------------------------------------------
void cmLocalUnixMakefileGenerator2::GenerateMakefile()
{
  // Open the output file.  This should not be copy-if-different
  // because the check-build-system step compares the makefile time to
  // see if the build system must be regenerated.
  std::string makefileName = m_Makefile->GetStartOutputDirectory();
  makefileName += "/" CMLUMG_MAKEFILE_NAME;
  cmGeneratedFileStream makefileStream(makefileName.c_str());
  if(!makefileStream)
    {
    return;
    }

  // Write the do not edit header.
  this->WriteDisclaimer(makefileStream);

  // Write standard variables to the makefile.
  this->WriteMakeVariables(makefileStream);

  // Write special targets that belong at the top of the file.
  this->WriteSpecialTargetsTop(makefileStream);

  // Write rules to build dependencies and targets.
  this->WriteAllRules(makefileStream);

  // Write dependency generation rules.
  this->WritePassRules(makefileStream, "depend",
                       "Build dependencies for this directory.",
                       m_DependTargets);

  // Write main build rules.
  this->WritePassRules(makefileStream, "build",
                       "Build targets in this directory.",
                       m_BuildTargets);

  // Write clean rules.
  this->WritePassRules(makefileStream, "clean",
                       "Clean targets in this directory.",
                       m_CleanTargets);

  // Write include statements to get rules for this directory.
  this->WriteRuleFileIncludes(makefileStream);

  // Write jump-and-build rules that were recorded in the map.
  this->WriteJumpAndBuildRules(makefileStream);

  // Write special targets that belong at the bottom of the file.
  this->WriteSpecialTargetsBottom(makefileStream);
}

//----------------------------------------------------------------------------
void cmLocalUnixMakefileGenerator2::GenerateCMakefile()
{
  std::string makefileName = m_Makefile->GetStartOutputDirectory();
  makefileName += "/" CMLUMG_MAKEFILE_NAME;
  std::string cmakefileName = makefileName;
  cmakefileName += ".cmake";

  // Open the output file.
  cmGeneratedFileStream cmakefileStream(cmakefileName.c_str());
  if(!cmakefileStream)
    {
    return;
    }

  // Write the do not edit header.
  this->WriteDisclaimer(cmakefileStream);

  // Get the list of files contributing to this generation step.
  // Sort the list and remove duplicates.
  std::vector<std::string> lfiles = m_Makefile->GetListFiles();
  std::sort(lfiles.begin(), lfiles.end(), std::less<std::string>());
  std::vector<std::string>::iterator new_end = std::unique(lfiles.begin(),
                                                           lfiles.end());
  lfiles.erase(new_end, lfiles.end());

  // Build the path to the cache file.
  std::string cache = m_Makefile->GetHomeOutputDirectory();
  cache += "/CMakeCache.txt";

  // Save the list to the cmake file.
  cmakefileStream
    << "# The corresponding makefile\n"
    << "# \"" << this->ConvertToRelativePath(makefileName.c_str()).c_str() << "\"\n"
    << "# was generated from the following files:\n"
    << "SET(CMAKE_MAKEFILE_DEPENDS\n"
    << "  \"" << this->ConvertToRelativePath(cache.c_str()).c_str() << "\"\n";
  for(std::vector<std::string>::const_iterator i = lfiles.begin();
      i !=  lfiles.end(); ++i)
    {
    cmakefileStream
      << "  \"" << this->ConvertToRelativePath(i->c_str()).c_str()
      << "\"\n";
    }
  cmakefileStream
    << "  )\n\n";

  // Build the path to the cache check file.
  std::string check = m_Makefile->GetHomeOutputDirectory();
  check += "/cmake.check_cache";

  // Set the corresponding makefile in the cmake file.
  cmakefileStream
    << "# The corresponding makefile is:\n"
    << "SET(CMAKE_MAKEFILE_OUTPUTS\n"
    << "  \"" << this->ConvertToRelativePath(makefileName.c_str()).c_str() << "\"\n"
    << "  \"" << this->ConvertToRelativePath(check.c_str()).c_str() << "\"\n"
    << "  \"CMakeDirectoryInformation.cmake\"\n"
    << "  )\n\n";

  // Set the set of files to check for dependency integrity.
  cmakefileStream
    << "# The set of files whose dependency integrity should be checked:\n";
  cmakefileStream
    << "SET(CMAKE_DEPENDS_LANGUAGES\n";
  for(std::map<cmStdString, IntegrityCheckSet>::const_iterator
        l = m_CheckDependFiles.begin();
      l != m_CheckDependFiles.end(); ++l)
    {
    cmakefileStream
      << "  \"" << l->first.c_str() << "\"\n";
    }
  cmakefileStream
    << "  )\n";
  for(std::map<cmStdString, IntegrityCheckSet>::const_iterator
        l = m_CheckDependFiles.begin();
      l != m_CheckDependFiles.end(); ++l)
    {
    cmakefileStream
      << "SET(CMAKE_DEPENDS_CHECK_" << l->first.c_str() << "\n";
    for(std::set<cmStdString>::const_iterator i = l->second.begin();
        i != l->second.end(); ++i)
      {
      cmakefileStream
        << "  \"" << this->ConvertToRelativePath(i->c_str()).c_str() << "\"\n";
      }
    cmakefileStream
      << "  )\n";
    }
}

//----------------------------------------------------------------------------
void cmLocalUnixMakefileGenerator2::GenerateDirectoryInformationFile()
{
  std::string infoFileName = m_Makefile->GetStartOutputDirectory();
  infoFileName += "/CMakeDirectoryInformation.cmake";

  // Open the output file.
  cmGeneratedFileStream infoFileStream(infoFileName.c_str());
  if(!infoFileStream)
    {
    return;
    }

  // Write the do not edit header.
  this->WriteDisclaimer(infoFileStream);

  // Store the include search path for this directory.
  infoFileStream
    << "# The C and CXX include file search paths:\n";
  infoFileStream
    << "SET(CMAKE_C_INCLUDE_PATH\n";
  std::vector<std::string> includeDirs;
  this->GetIncludeDirectories(includeDirs);
  for(std::vector<std::string>::iterator i = includeDirs.begin();
      i != includeDirs.end(); ++i)
    {
    infoFileStream
      << "  \"" << this->ConvertToRelativePath(i->c_str()).c_str() << "\"\n";
    }
  infoFileStream
    << "  )\n";
  infoFileStream
    << "SET(CMAKE_CXX_INCLUDE_PATH ${CMAKE_C_INCLUDE_PATH})\n";

  // Store the include regular expressions for this directory.
  infoFileStream
    << "\n"
    << "# The C and CXX include file regular expressions for this directory.\n";
  infoFileStream
    << "SET(CMAKE_C_INCLUDE_REGEX_SCAN ";
  this->WriteCMakeArgument(infoFileStream,
                           m_Makefile->GetIncludeRegularExpression());
  infoFileStream
    << ")\n";
  infoFileStream
    << "SET(CMAKE_C_INCLUDE_REGEX_COMPLAIN ";
  this->WriteCMakeArgument(infoFileStream,
                           m_Makefile->GetComplainRegularExpression());
  infoFileStream
    << ")\n";
  infoFileStream
    << "SET(CMAKE_CXX_INCLUDE_REGEX_SCAN ${CMAKE_C_INCLUDE_REGEX_SCAN})\n";
  infoFileStream
    << "SET(CMAKE_CXX_INCLUDE_REGEX_COMPLAIN ${CMAKE_C_INCLUDE_REGEX_COMPLAIN})\n";
}

//----------------------------------------------------------------------------
void
cmLocalUnixMakefileGenerator2
::GenerateTargetRuleFile(const cmTarget& target)
{
  // Create a directory for this target.
  std::string dir = this->GetTargetDirectory(target);
  cmSystemTools::MakeDirectory(this->ConvertToFullPath(dir).c_str());

  // First generate the object rule files.  Save a list of all object
  // files for this target.
  std::vector<std::string> objects;
  std::vector<std::string> external_objects;
  std::vector<std::string> provides_requires;
  const std::vector<cmSourceFile*>& sources = target.GetSourceFiles();
  for(std::vector<cmSourceFile*>::const_iterator source = sources.begin();
      source != sources.end(); ++source)
    {
    if(!(*source)->GetPropertyAsBool("HEADER_FILE_ONLY") &&
       !(*source)->GetCustomCommand())
      {
      if(!m_GlobalGenerator->IgnoreFile((*source)->GetSourceExtension().c_str()))
        {
        // Generate this object file's rule file.
        this->GenerateObjectRuleFile(target, *(*source), objects,
                                     provides_requires);
        }
      else if((*source)->GetPropertyAsBool("EXTERNAL_OBJECT"))
        {
        // This is an external object file.  Just add it.
        external_objects.push_back((*source)->GetFullPath());
        }
      }
    }

  // Generate the build-time dependencies file for this target.
  std::string depBase = dir;
  depBase += "/";
  depBase += target.GetName();

  // Construct the rule file name.
  std::string ruleFileName = dir;
  ruleFileName += "/";
  ruleFileName += target.GetName();
  ruleFileName += ".make";

  // The rule file must be included by the makefile.
  m_IncludeRuleFiles.push_back(ruleFileName);

  // Open the rule file.  This should be copy-if-different because the
  // rules may depend on this file itself.
  std::string ruleFileNameFull = this->ConvertToFullPath(ruleFileName);
  cmGeneratedFileStream ruleFileStream(ruleFileNameFull.c_str());
  ruleFileStream.SetCopyIfDifferent(true);
  if(!ruleFileStream)
    {
    return;
    }
  this->WriteDisclaimer(ruleFileStream);
  ruleFileStream
    << "# Rule file for target " << target.GetName() << ".\n\n";

  // Include the rule file for each object.
  if(!objects.empty())
    {
    ruleFileStream
      << "# Include make rules for object files.\n";
    for(std::vector<std::string>::const_iterator obj = objects.begin();
        obj != objects.end(); ++obj)
      {
      std::string objRuleFileName = *obj;
      objRuleFileName += ".make";
      ruleFileStream
        << m_IncludeDirective << " "
        << this->ConvertToOutputForExisting(objRuleFileName.c_str()).c_str()
        << "\n";
      }
    ruleFileStream
      << "\n";
    }

  // Write the rule for this target type.
  switch(target.GetType())
    {
    case cmTarget::STATIC_LIBRARY:
      this->WriteStaticLibraryRule(ruleFileStream, ruleFileName.c_str(),
                                   target, objects, external_objects,
                                   provides_requires);
      break;
    case cmTarget::SHARED_LIBRARY:
      this->WriteSharedLibraryRule(ruleFileStream, ruleFileName.c_str(),
                                   target, objects, external_objects,
                                   provides_requires);
      break;
    case cmTarget::MODULE_LIBRARY:
      this->WriteModuleLibraryRule(ruleFileStream, ruleFileName.c_str(),
                                   target, objects, external_objects,
                                   provides_requires);
      break;
    case cmTarget::EXECUTABLE:
      this->WriteExecutableRule(ruleFileStream, ruleFileName.c_str(),
                                target, objects, external_objects,
                                provides_requires);
      break;
    default:
      break;
    }
}

//----------------------------------------------------------------------------
void
cmLocalUnixMakefileGenerator2
::GenerateObjectRuleFile(const cmTarget& target, const cmSourceFile& source,
                         std::vector<std::string>& objects,
                         std::vector<std::string>& provides_requires)
{
  // Identify the language of the source file.
  const char* lang = this->GetSourceFileLanguage(source);
  if(!lang)
    {
    // If language is not known, this is an error.
    cmSystemTools::Error("Source file \"", source.GetFullPath().c_str(),
                         "\" has unknown type.");
    return;
    }

  // Get the full path name of the object file.
  // TODO: Remove duplicate objects and warn.
  std::string obj = this->GetObjectFileName(target, source);

  // Create the directory containing the object file.  This may be a
  // subdirectory under the target's directory.
  std::string dir = cmSystemTools::GetFilenamePath(obj.c_str());
  cmSystemTools::MakeDirectory(this->ConvertToFullPath(dir).c_str());

  // Generate the build-time dependencies file for this object file.
  std::string depMakeFile;
  std::string depMarkFile;
  if(!this->GenerateDependsMakeFile(lang, obj.c_str(),
                                    depMakeFile, depMarkFile))
    {
    cmSystemTools::Error("No dependency checker available for language \"",
                         lang, "\".");
    return;
    }

  // Save this in the target's list of object files.
  objects.push_back(obj);

  // The object file should be checked for dependency integrity.
  m_CheckDependFiles[lang].insert(obj);

  // Open the rule file for writing.  This should be copy-if-different
  // because the rules may depend on this file itself.
  std::string ruleFileName = obj;
  ruleFileName += ".make";
  std::string ruleFileNameFull = this->ConvertToFullPath(ruleFileName);
  cmGeneratedFileStream ruleFileStream(ruleFileNameFull.c_str());
  ruleFileStream.SetCopyIfDifferent(true);
  if(!ruleFileStream)
    {
    return;
    }
  this->WriteDisclaimer(ruleFileStream);
  ruleFileStream
    << "# Rule file for object file " << obj.c_str() << ".\n\n";

  // Include the dependencies for the target.
  ruleFileStream
    << "# Include any dependencies generated for this rule.\n"
    << m_IncludeDirective << " "
    << this->ConvertToOutputForExisting(depMakeFile.c_str()).c_str()
    << "\n\n";

  // Create the list of dependencies known at cmake time.  These are
  // shared between the object file and dependency scanning rule.
  std::vector<std::string> depends;
  depends.push_back(source.GetFullPath());
  if(const char* objectDeps = source.GetProperty("OBJECT_DEPENDS"))
    {
    std::vector<std::string> deps;
    cmSystemTools::ExpandListArgument(objectDeps, deps);
    for(std::vector<std::string>::iterator i = deps.begin();
        i != deps.end(); ++i)
      {
      depends.push_back(i->c_str());
      }
    }
  depends.push_back(ruleFileName);

  // Write the dependency generation rule.
  {
  std::string depEcho = "Scanning ";
  depEcho += lang;
  depEcho += " dependencies of ";
  depEcho += this->ConvertToRelativeOutputPath(obj.c_str());
  depEcho += "...";

  // Add a command to call CMake to scan dependencies.  CMake will
  // touch the corresponding depends file after scanning dependencies.
  cmOStringStream depCmd;
  // TODO: Account for source file properties and directory-level
  // definitions when scanning for dependencies.
  depCmd << "$(CMAKE_COMMAND) -E cmake_depends " << lang << " "
         << this->ConvertToRelativeOutputPath(obj.c_str()) << " "
         << this->ConvertToRelativeOutputPath(source.GetFullPath().c_str());
  std::vector<std::string> commands;
  commands.push_back(depCmd.str());

  // Write the rule.
  this->WriteMakeRule(ruleFileStream, 0, depEcho.c_str(),
                      depMarkFile.c_str(), depends, commands);
  }

  // Write the build rule.
  {
  // Build the set of compiler flags.
  std::string flags;

  // Add the export symbol definition for shared library objects.
  bool shared = ((target.GetType() == cmTarget::SHARED_LIBRARY) ||
                 (target.GetType() == cmTarget::MODULE_LIBRARY));
  if(shared)
    {
    flags += "-D";
    if(const char* custom_export_name = target.GetProperty("DEFINE_SYMBOL"))
      {
      flags += custom_export_name;
      }
    else
      {
      std::string in = target.GetName();
      in += "_EXPORTS";
      flags += cmSystemTools::MakeCindentifier(in.c_str());
      }
    }

  // Add flags from source file properties.
  this->AppendFlags(flags, source.GetProperty("COMPILE_FLAGS"));

  // Add language-specific flags.
  this->AddLanguageFlags(flags, lang);

  // Add shared-library flags if needed.
  this->AddSharedFlags(flags, lang, shared);

  // Add include directory flags.
  this->AppendFlags(flags, this->GetIncludeFlags(lang));

  // Get the output paths for source and object files.
  std::string sourceFile =
    this->ConvertToRelativeOutputPath(source.GetFullPath().c_str());
  std::string objectFile =
    this->ConvertToRelativeOutputPath(obj.c_str());

  // Construct the compile rules.
  std::vector<std::string> commands;
  std::string compileRuleVar = "CMAKE_";
  compileRuleVar += lang;
  compileRuleVar += "_COMPILE_OBJECT";
  std::string compileRule =
    m_Makefile->GetRequiredDefinition(compileRuleVar.c_str());
  cmSystemTools::ExpandListArgument(compileRule, commands);

  // Expand placeholders in the commands.
  for(std::vector<std::string>::iterator i = commands.begin();
      i != commands.end(); ++i)
    {
    this->ExpandRuleVariables(*i,
                              lang,
                              0, // no objects
                              0, // no target
                              0, // no link libs
                              sourceFile.c_str(),
                              objectFile.c_str(),
                              flags.c_str());
    }

  // Write the rule.
  std::string buildEcho = "Building ";
  buildEcho += lang;
  buildEcho += " object ";
  buildEcho += this->ConvertToRelativeOutputPath(obj.c_str());
  buildEcho += "...";
  this->WriteMakeRule(ruleFileStream, 0, buildEcho.c_str(),
                      obj.c_str(), depends, commands);
  }

  // If the language needs provides-requires mode, create the
  // corresponding targets.
  if(strcmp(lang, "Fortran") == 0)
    {
    std::string objectRequires = obj;
    std::string objectProvides = obj;
    objectRequires += ".requires";
    objectProvides += ".provides";
    {
    // Add the provides target to build the object file.
    std::vector<std::string> no_commands;
    std::vector<std::string> p_depends;
    p_depends.push_back(obj);
    this->WriteMakeRule(ruleFileStream, 0, 0,
                        objectProvides.c_str(), p_depends, no_commands);
    }
    {
    // Add the requires target to recursively build the provides
    // target after needed information is up to date.
    std::vector<std::string> no_depends;
    std::vector<std::string> r_commands;
    r_commands.push_back(this->GetRecursiveMakeCall(objectProvides.c_str()));
    this->WriteMakeRule(ruleFileStream, 0, 0,
                        objectRequires.c_str(), no_depends, r_commands);
    }

    // Add this to the set of provides-requires objects on the target.
    provides_requires.push_back(objectRequires);
    }
}

//----------------------------------------------------------------------------
void
cmLocalUnixMakefileGenerator2
::GenerateCustomRuleFile(const cmCustomCommand& cc)
{
  // Create a directory for custom rule files.
  std::string dir = "CMakeCustomRules.dir";
  cmSystemTools::MakeDirectory(this->ConvertToFullPath(dir).c_str());

  // Construct the name of the rule file.
  std::string customName = this->GetCustomBaseName(cc);
  std::string ruleFileName = dir;
  ruleFileName += "/";
  ruleFileName += customName;
  ruleFileName += ".make";

  // If this is a duplicate rule produce an error.
  if(m_CustomRuleFiles.find(ruleFileName) != m_CustomRuleFiles.end())
    {
    cmSystemTools::Error("An output was found with multiple rules on how to build it for output: ",
                         cc.GetOutput().c_str());
    return;
    }
  m_CustomRuleFiles.insert(ruleFileName);

  // This rule should be included by the makefile.
  m_IncludeRuleFiles.push_back(ruleFileName);

  // Open the rule file.  This should be copy-if-different because the
  // rules may depend on this file itself.
  std::string ruleFileNameFull = this->ConvertToFullPath(ruleFileName);
  cmGeneratedFileStream ruleFileStream(ruleFileNameFull.c_str());
  ruleFileStream.SetCopyIfDifferent(true);
  if(!ruleFileStream)
    {
    return;
    }
  this->WriteDisclaimer(ruleFileStream);
  ruleFileStream
    << "# Custom command rule file for " << customName.c_str() << ".\n\n";

  // Collect the commands.
  std::vector<std::string> commands;
  this->AppendCustomCommand(commands, cc);

  // Collect the dependencies.
  std::vector<std::string> depends;
  this->AppendCustomDepend(depends, cc);

  // Add a dependency on the rule file itself.
  depends.push_back(ruleFileName);

  // Write the rule.
  const char* comment = 0;
  if(cc.GetComment().size())
    {
    comment = cc.GetComment().c_str();
    }
  std::string preEcho = "Generating ";
  preEcho += customName;
  preEcho += "...";
  this->WriteMakeRule(ruleFileStream, comment, preEcho.c_str(),
                      cc.GetOutput().c_str(), depends, commands);
}

//----------------------------------------------------------------------------
void
cmLocalUnixMakefileGenerator2
::GenerateUtilityRuleFile(const cmTarget& target)
{
  // Create a directory for utility rule files.
  std::string dir = "CMakeCustomRules.dir";
  cmSystemTools::MakeDirectory(this->ConvertToFullPath(dir).c_str());

  // Construct the name of the rule file.
  std::string ruleFileName = dir;
  ruleFileName += "/";
  ruleFileName += target.GetName();
  ruleFileName += ".make";

  // This rule should be included by the makefile.
  m_IncludeRuleFiles.push_back(ruleFileName);

  // Open the rule file.  This should be copy-if-different because the
  // rules may depend on this file itself.
  std::string ruleFileNameFull = this->ConvertToFullPath(ruleFileName);
  cmGeneratedFileStream ruleFileStream(ruleFileNameFull.c_str());
  ruleFileStream.SetCopyIfDifferent(true);
  if(!ruleFileStream)
    {
    return;
    }
  this->WriteDisclaimer(ruleFileStream);
  ruleFileStream
    << "# Utility rule file for " << target.GetName() << ".\n\n";

  // TODO: Pre-build and pre-link rules.

  // Collect the commands and dependencies.
  std::vector<std::string> commands;
  std::vector<std::string> depends;

  // Utility targets store their rules in post-build commands.
  this->AppendCustomDepends(depends, target.GetPostBuildCommands());
  this->AppendCustomCommands(commands, target.GetPostBuildCommands());

  // Add dependencies on targets that must be built first.
  this->AppendTargetDepends(depends, target);

  // Add a dependency on the rule file itself.
  depends.push_back(ruleFileName);

  // Write the rule.
  this->WriteMakeRule(ruleFileStream, 0, 0,
                      target.GetName(), depends, commands);

  // Add this to the list of build rules in this directory.
  if(target.IsInAll())
    {
    m_BuildTargets.push_back(target.GetName());
    }
}

//----------------------------------------------------------------------------
bool
cmLocalUnixMakefileGenerator2
::GenerateDependsMakeFile(const std::string& lang, const char* objFile,
                          std::string& depMakeFile, std::string& depMarkFile)
{
  // Construct a checker for the given language.
  std::auto_ptr<cmDepends>
    checker(this->GetDependsChecker(lang,
                                    m_Makefile->GetStartOutputDirectory(),
                                    objFile));
  if(checker.get())
    {
    // Save the make and mark file names.
    depMakeFile = checker->GetMakeFileName();
    depMarkFile = checker->GetMarkFileName();

    // Check the dependencies.
    checker->Check();

    return true;
    }
  return false;
}

//----------------------------------------------------------------------------
void
cmLocalUnixMakefileGenerator2
::WriteMakeRule(std::ostream& os,
                const char* comment,
                const char* preEcho,
                const char* target,
                const std::vector<std::string>& depends,
                const std::vector<std::string>& commands,
                const char* postEcho)
{
  // Make sure there is a target.
  if(!target || !*target)
    {
    cmSystemTools::Error("No target for WriteMakeRule!");
    return;
    }

  std::string replace;

  // Write the comment describing the rule in the makefile.
  if(comment)
    {
    replace = comment;
    m_Makefile->ExpandVariablesInString(replace);
    std::string::size_type lpos = 0;
    std::string::size_type rpos;
    while((rpos = replace.find('\n', lpos)) != std::string::npos)
      {
      os << "# " << replace.substr(lpos, rpos-lpos) << "\n";
      lpos = rpos+1;
      }
    os << "# " << replace.substr(lpos) << "\n";
    }

  // Construct the left hand side of the rule.
  replace = target;
  m_Makefile->ExpandVariablesInString(replace);
  std::string tgt = this->ConvertToRelativeOutputPath(replace.c_str());
  tgt = this->ConvertToMakeTarget(tgt.c_str());
  const char* space = "";
  if(tgt.size() == 1)
    {
    // Add a space before the ":" to avoid drive letter confusion on
    // Windows.
    space = " ";
    }

  // Write the rule.
  if(depends.empty())
    {
    // No dependencies.  The commands will always run.
    os << tgt.c_str() << space << ":\n";
    }
  else
    {
    // Split dependencies into multiple rule lines.  This allows for
    // very long dependency lists even on older make implementations.
    for(std::vector<std::string>::const_iterator dep = depends.begin();
        dep != depends.end(); ++dep)
      {
      replace = *dep;
      m_Makefile->ExpandVariablesInString(replace);
      replace = this->ConvertToRelativeOutputPath(replace.c_str());
      replace = this->ConvertToMakeTarget(replace.c_str());
      os << tgt.c_str() << space << ": " << replace.c_str() << "\n";
      }
    }

  // Write the list of commands.
  bool first = true;
  for(std::vector<std::string>::const_iterator i = commands.begin();
      i != commands.end(); ++i)
    {
    replace = *i;
    m_Makefile->ExpandVariablesInString(replace);
    if(first && preEcho)
      {
      this->OutputEcho(os, preEcho);
      }
    os << "\t" << replace.c_str() << "\n";
    first = false;
    }
  if(postEcho)
    {
    this->OutputEcho(os, postEcho);
    }
  os << "\n";
}

//----------------------------------------------------------------------------
void cmLocalUnixMakefileGenerator2::WriteDivider(std::ostream& os)
{
  os
    << "#======================================"
    << "=======================================\n";
}

//----------------------------------------------------------------------------
void cmLocalUnixMakefileGenerator2::WriteDisclaimer(std::ostream& os)
{
  os
    << "# CMAKE generated file: DO NOT EDIT!\n"
    << "# Generated by \"" << m_GlobalGenerator->GetName() << "\""
    << " Generator, CMake Version "
    << cmMakefile::GetMajorVersion() << "."
    << cmMakefile::GetMinorVersion() << "\n\n";
}

//----------------------------------------------------------------------------
void
cmLocalUnixMakefileGenerator2
::WriteMakeVariables(std::ostream& makefileStream)
{
  this->WriteDivider(makefileStream);
  makefileStream
    << "# Set environment variables for the build.\n"
    << "\n";
  if(m_WindowsShell)
    {
    makefileStream
      << "!IF \"$(OS)\" == \"Windows_NT\"\n"
      << "NULL=\n"
      << "!ELSE\n"
      << "NULL=nul\n"
      << "!ENDIF\n";
    }
  else
    {
    makefileStream
      << "# The shell in which to execute make rules.\n"
      << "SHELL = /bin/sh\n"
      << "\n";
    }

  if(m_Makefile->IsOn("CMAKE_VERBOSE_MAKEFILE"))
    {
    makefileStream
      << "# Produce verbose output by default.\n"
      << "VERBOSE = 1\n"
      << "\n";
    }

  std::string cmakecommand =
    this->ConvertToOutputForExisting(
      m_Makefile->GetRequiredDefinition("CMAKE_COMMAND"));
  makefileStream
    << "# The CMake executable.\n"
    << "CMAKE_COMMAND = "
    << this->ConvertToRelativeOutputPath(cmakecommand.c_str()).c_str() << "\n"
    << "\n";
  makefileStream
    << "# The command to remove a file.\n"
    << "RM = "
    << this->ConvertToRelativeOutputPath(cmakecommand.c_str()).c_str()
    << " -E remove -f\n"
    << "\n";

  if(m_Makefile->GetDefinition("CMAKE_EDIT_COMMAND"))
    {
    makefileStream
      << "# The program to use to edit the cache.\n"
      << "CMAKE_EDIT_COMMAND = "
      << (this->ConvertToOutputForExisting(
            m_Makefile->GetDefinition("CMAKE_EDIT_COMMAND"))) << "\n"
      << "\n";
    }

  makefileStream
    << "# The source directory corresponding to this makefile.\n"
    << "CMAKE_CURRENT_SOURCE = "
    << this->ConvertToRelativeOutputPath(m_Makefile->GetStartDirectory())
    << "\n"
    << "\n";
  makefileStream
    << "# The build directory corresponding to this makefile.\n"
    << "CMAKE_CURRENT_BINARY = "
    << this->ConvertToRelativeOutputPath(m_Makefile->GetStartOutputDirectory())
    << "\n"
    << "\n";
  makefileStream
    << "# The top-level source directory on which CMake was run.\n"
    << "CMAKE_SOURCE_DIR = "
    << this->ConvertToRelativeOutputPath(m_Makefile->GetHomeDirectory())
    << "\n"
    << "\n";
  makefileStream
    << "# The top-level build directory on which CMake was run.\n"
    << "CMAKE_BINARY_DIR = "
    << this->ConvertToRelativeOutputPath(m_Makefile->GetHomeOutputDirectory())
    << "\n"
    << "\n";
}

//----------------------------------------------------------------------------
void
cmLocalUnixMakefileGenerator2
::WriteSpecialTargetsTop(std::ostream& makefileStream)
{
  this->WriteDivider(makefileStream);
  makefileStream
    << "# Special targets provided by cmake.\n"
    << "\n";

  // Write the main entry point target.  This must be the VERY first
  // target so that make with no arguments will run it.
  {
  // Just depend on the all target to drive the build.
  std::vector<std::string> depends;
  std::vector<std::string> no_commands;
  depends.push_back("all");

  // Write the rule.
  this->WriteMakeRule(makefileStream,
                      "Default target executed when no arguments are "
                      "given to make.",
                      0,
                      "default_target",
                      depends,
                      no_commands);
  }

  // Write special "install" target to run cmake_install.cmake script.
  {
  std::vector<std::string> no_depends;
  std::vector<std::string> commands;
  std::string cmd;
  if(m_Makefile->GetDefinition("CMake_BINARY_DIR"))
    {
    // We are building CMake itself.  We cannot use the original
    // executable to install over itself.
    cmd = m_ExecutableOutputPath;
    cmd += "cmake";
    cmd = this->ConvertToRelativeOutputPath(cmd.c_str());
    }
  else
    {
    cmd = "$(CMAKE_COMMAND)";
    }
  cmd += " -P cmake_install.cmake";
  commands.push_back(cmd);
  this->WriteMakeRule(makefileStream,
                      "Special rule to run installation script.", 0,
                      "install", no_depends, commands);
  }

  // Write special "rebuild_cache" target to re-run cmake.
  {
  std::vector<std::string> no_depends;
  std::vector<std::string> commands;
  commands.push_back(
    "$(CMAKE_COMMAND) -H$(CMAKE_SOURCE_DIR) -B$(CMAKE_BINARY_DIR)");
  this->WriteMakeRule(makefileStream,
                      "Special rule to re-run CMake using make.",
                      "Running CMake to regenerate build system...",
                      "rebuild_cache",
                      no_depends,
                      commands);
  }

  // Use CMAKE_EDIT_COMMAND for the edit_cache rule if it is defined.
  // Otherwise default to the interactive command-line interface.
  if(m_Makefile->GetDefinition("CMAKE_EDIT_COMMAND"))
    {
    std::vector<std::string> no_depends;
    std::vector<std::string> commands;
    commands.push_back(
      "$(CMAKE_EDIT_COMMAND) -H$(CMAKE_SOURCE_DIR) -B$(CMAKE_BINARY_DIR)");
    this->WriteMakeRule(makefileStream,
                        "Special rule to re-run CMake cache editor using make.",
                        "Running CMake cache editor...",
                        "edit_cache",
                        no_depends,
                        commands);
    }
  else
    {
    std::vector<std::string> no_depends;
    std::vector<std::string> commands;
    commands.push_back(
      "$(CMAKE_COMMAND) -H$(CMAKE_SOURCE_DIR) -B$(CMAKE_BINARY_DIR) -i");
    this->WriteMakeRule(makefileStream,
                        "Special rule to re-run CMake cache editor using make.",
                        "Running interactive CMake command-line interface...",
                        "edit_cache",
                        no_depends,
                        commands);
    }
}

//----------------------------------------------------------------------------
void
cmLocalUnixMakefileGenerator2
::WriteSpecialTargetsBottom(std::ostream& makefileStream)
{
  this->WriteDivider(makefileStream);
  makefileStream
    << "# Special targets to cleanup operation of make.\n"
    << "\n";

  // Write special "cmake_check_build_system" target to run cmake with
  // the --check-build-system flag.
  {
  // Build command to run CMake to check if anything needs regenerating.
  std::string cmakefileName = m_Makefile->GetStartOutputDirectory();
  cmakefileName += "/" CMLUMG_MAKEFILE_NAME ".cmake";
  std::string runRule =
    "$(CMAKE_COMMAND) -H$(CMAKE_SOURCE_DIR) -B$(CMAKE_BINARY_DIR)";
  runRule += " --check-build-system ";
  runRule += this->ConvertToRelativeOutputPath(cmakefileName.c_str());

  std::vector<std::string> no_depends;
  std::vector<std::string> commands;
  commands.push_back(runRule);
  std::string preEcho = "Checking build system in ";
  preEcho += m_Makefile->GetStartOutputDirectory();
  preEcho += "...";
  this->WriteMakeRule(makefileStream,
                      "Special rule to run CMake to check the build system "
                      "integrity.\n"
                      "No rule that depends on this can have "
                      "commands that come from listfiles\n"
                      "because they might be regenerated.",
                      preEcho.c_str(),
                      "cmake_check_build_system",
                      no_depends,
                      commands);
  }

  std::vector<std::string> no_commands;

  // Write special target to silence make output.  This must be after
  // the default target in case VERBOSE is set (which changes the
  // name).  The setting of CMAKE_VERBOSE_MAKEFILE to ON will cause a
  // "VERBOSE=1" to be added as a make variable which will change the
  // name of this special target.  This gives a make-time choice to
  // the user.
  std::vector<std::string> no_depends;
  this->WriteMakeRule(makefileStream,
                      "Suppress display of executed commands.",
                      0,
                      "$(VERBOSE).SILENT",
                      no_depends,
                      no_commands);

  // Special target to cleanup operation of make tool.
  std::vector<std::string> depends;
  this->WriteMakeRule(makefileStream,
                      "Disable implicit rules so canoncical targets will work.",
                      0,
                      ".SUFFIXES",
                      depends,
                      no_commands);
  depends.push_back(".hpux_make_must_have_suffixes_list");
  this->WriteMakeRule(makefileStream, 0, 0,
                      ".SUFFIXES", depends, no_commands);
}

//----------------------------------------------------------------------------
void
cmLocalUnixMakefileGenerator2
::WriteAllRules(std::ostream& makefileStream)
{
  // Write section header.
  this->WriteDivider(makefileStream);
  makefileStream
    << "# Rules to build dependencies and targets.\n"
    << "\n";

  // Write rules to traverse the directory tree building dependencies
  // and targets.
  this->WriteDriverRules(makefileStream, "all", "depend.local", "build.local");
}

//----------------------------------------------------------------------------
void
cmLocalUnixMakefileGenerator2
::WritePassRules(std::ostream& makefileStream,
                 const char* pass,
                 const char* comment,
                 const std::vector<std::string>& depends)
{
  // Write section header.
  this->WriteDivider(makefileStream);
  makefileStream
    << "# Rules for the " << pass << " pass.\n"
    << "\n";

  // Write rules to traverse the directory tree for this pass.
  std::string passLocal = pass;
  passLocal += ".local";
  this->WriteDriverRules(makefileStream, pass, passLocal.c_str());

  // If there are no dependencies, use empty commands.
  std::vector<std::string> commands;
  if(depends.empty())
    {
    commands = m_EmptyCommands;
    }

  // Write the rule.
  this->WriteMakeRule(makefileStream, comment, 0, passLocal.c_str(),
                      depends, commands);
}

//----------------------------------------------------------------------------
void
cmLocalUnixMakefileGenerator2
::WriteDriverRules(std::ostream& makefileStream, const char* pass,
                   const char* local1, const char* local2)
{
  // Write a set of targets that will traverse the directory structure
  // in order and build given local targets in each directory.

  // The dependencies and commands generated for this rule must not
  // depend on listfile contents because the build system check might
  // regenerate the makefile but it might not get read again by make
  // before the commands run.
  std::vector<std::string> depends;
  std::vector<std::string> commands;

  // Check the build system in this directory.
  depends.push_back("cmake_check_build_system");

  // Recursively handle pre-order directories.
  std::string preTarget = pass;
  preTarget += ".pre-order";
  commands.push_back(this->GetRecursiveMakeCall(preTarget.c_str()));

  // Recursively build the local targets in this directory.
  if(local1)
    {
    commands.push_back(this->GetRecursiveMakeCall(local1));
    }
  if(local2)
    {
    commands.push_back(this->GetRecursiveMakeCall(local2));
    }

  // Recursively handle post-order directories.
  std::string postTarget = pass;
  postTarget += ".post-order";
  commands.push_back(this->GetRecursiveMakeCall(postTarget.c_str()));

  // Write the rule.
  std::string preEcho = "Entering directory ";
  preEcho += m_Makefile->GetStartOutputDirectory();
  std::string postEcho = "Finished directory ";
  postEcho += m_Makefile->GetStartOutputDirectory();
  this->WriteMakeRule(makefileStream, 0, preEcho.c_str(),
                      pass, depends, commands, postEcho.c_str());

  // Write the subdirectory traversal rules.
  this->WriteSubdirRules(makefileStream, pass);
}

//----------------------------------------------------------------------------
void
cmLocalUnixMakefileGenerator2
::WriteSubdirRules(std::ostream& makefileStream, const char* pass)
{
  // Iterate through subdirectories.  Only entries in which the
  // boolean is true should be included.  Keep track of the last
  // pre-order and last post-order rule created so that ordering can
  // be enforced.
  const std::vector<std::pair<cmStdString, bool> >&
    subdirs = m_Makefile->GetSubDirectories();
  std::string lastPre = "";
  std::string lastPost = "";
  for(std::vector<std::pair<cmStdString, bool> >::const_iterator
        i = subdirs.begin(); i != subdirs.end(); ++i)
    {
    if(i->second)
      {
      // Add the subdirectory rule either for pre-order or post-order.
      if(m_Makefile->IsDirectoryPreOrder(i->first.c_str()))
        {
        this->WriteSubdirRule(makefileStream, pass, i->first.c_str(), lastPre);
        }
      else
        {
        this->WriteSubdirRule(makefileStream, pass, i->first.c_str(), lastPost);
        }
      }
    }

  // Write the subdir driver rules.  Hook them to the last
  // subdirectory of their corresponding order.
  this->WriteSubdirDriverRule(makefileStream, pass, "pre", lastPre);
  this->WriteSubdirDriverRule(makefileStream, pass, "post", lastPost);
}

//----------------------------------------------------------------------------
void
cmLocalUnixMakefileGenerator2
::WriteSubdirRule(std::ostream& makefileStream, const char* pass,
                  const char* subdir, std::string& last)
{
  std::vector<std::string> depends;
  std::vector<std::string> commands;

  // Construct the name of the subdirectory rule.
  std::string tgt = this->GetSubdirTargetName(pass, subdir);

  if(m_WindowsShell)
    {
    // On Windows we must perform each step separately and then change
    // back because the shell keeps the working directory between
    // commands.
    std::string cmd = "cd ";
    cmd += this->ConvertToOutputForExisting(subdir);
    commands.push_back(cmd);

    // Build the target for this pass.
    commands.push_back(this->GetRecursiveMakeCall(pass));

    // Change back to the starting directory.  Any trailing slash must
    // be removed to avoid problems with Borland Make.
    std::string destFull = m_Makefile->GetStartOutputDirectory();
    destFull += "/";
    destFull += subdir;
    std::string back =
      cmSystemTools::RelativePath(destFull.c_str(),
                                  m_Makefile->GetStartOutputDirectory());
    if(back.size() && back[back.size()-1] == '/')
      {
      back = back.substr(0, back.size()-1);
      }
    cmd = "cd ";
    cmd += this->ConvertToOutputForExisting(back.c_str());
    commands.push_back(cmd);
    }
  else
    {
    // On UNIX we must construct a single shell command to change
    // directory and build because make resets the directory between
    // each command.
    std::string cmd = "cd ";
    cmd += this->ConvertToOutputForExisting(subdir);

    // Build the target for this pass.
    cmd += " && ";
    cmd += this->GetRecursiveMakeCall(pass);

    // Add the command as a single line.
    commands.push_back(cmd);
    }

  // Depend on the last directory written out to enforce ordering.
  if(last.size() > 0)
    {
    depends.push_back(last);
    }

  // Write the rule.
  this->WriteMakeRule(makefileStream, 0, 0, tgt.c_str(), depends, commands);

  // This rule is now the last one written.
  last = tgt;
}

//----------------------------------------------------------------------------
void
cmLocalUnixMakefileGenerator2
::WriteSubdirDriverRule(std::ostream& makefileStream, const char* pass,
                        const char* order, const std::string& last)
{
  // This rule corresponds to a particular pass (all, clean, etc).  It
  // dispatches the build into subdirectories in pre- or post-order.
  std::vector<std::string> depends;
  std::vector<std::string> commands;
  if(last.size())
    {
    // Use the dependency to drive subdirectory processing.
    depends.push_back(last);
    }
  else
    {
    // There are no subdirectories.  Use the empty commands to avoid
    // make errors on some platforms.
    commands = m_EmptyCommands;
    }

  // Build comment to describe purpose.
  std::string comment = "Driver target for ";
  comment += order;
  comment += "-order subdirectories during the ";
  comment += pass;
  comment += " pass.";

  // Build the make target name.
  std::string tgt = pass;
  tgt += ".";
  tgt += order;
  tgt += "-order";

  // Write the rule.
  this->WriteMakeRule(makefileStream, comment.c_str(), 0,
                      tgt.c_str(), depends, commands);
}

//----------------------------------------------------------------------------
void
cmLocalUnixMakefileGenerator2
::WriteConvenienceRules(std::ostream& ruleFileStream, const cmTarget& target,
                        const char* targetOutPath)
{
  // Add a rule to build the target by name.
  std::string localName = this->GetFullTargetName(target.GetName(), target);
  localName = this->ConvertToRelativeOutputPath(localName.c_str());
  this->WriteConvenienceRule(ruleFileStream, targetOutPath,
                             localName.c_str());

  // Add a target with the canonical name (no prefix, suffix or path).
  if(localName != target.GetName())
    {
    this->WriteConvenienceRule(ruleFileStream, targetOutPath,
                               target.GetName());
    }
}

//----------------------------------------------------------------------------
void
cmLocalUnixMakefileGenerator2
::WriteConvenienceRule(std::ostream& ruleFileStream,
                       const char* realTarget,
                       const char* helpTarget)
{
  // A rule is only needed if the names are different.
  if(strcmp(realTarget, helpTarget) != 0)
    {
    // The helper target depends on the real target.
    std::vector<std::string> depends;
    depends.push_back(realTarget);

    // There are no commands.
    std::vector<std::string> no_commands;

    // Write the rule.
    this->WriteMakeRule(ruleFileStream, "Convenience name for target.", 0,
                        helpTarget, depends, no_commands);
    }
}

//----------------------------------------------------------------------------
void
cmLocalUnixMakefileGenerator2
::WriteRuleFileIncludes(std::ostream& makefileStream)
{
  // Make sure we have some rules to include.
  if(m_IncludeRuleFiles.empty())
    {
    return;
    }

  // Write section header.
  this->WriteDivider(makefileStream);
  makefileStream
    << "# Include rule files for this directory.\n"
    << "\n";

  // Write the include rules.
  for(std::vector<std::string>::const_iterator i = m_IncludeRuleFiles.begin();
      i != m_IncludeRuleFiles.end(); ++i)
    {
    makefileStream
      << m_IncludeDirective << " "
      << this->ConvertToOutputForExisting(i->c_str()).c_str()
      << "\n";
    }
  makefileStream << "\n";
}

//----------------------------------------------------------------------------
void
cmLocalUnixMakefileGenerator2
::WriteExecutableRule(std::ostream& ruleFileStream,
                      const char* ruleFileName,
                      const cmTarget& target,
                      const std::vector<std::string>& objects,
                      const std::vector<std::string>& external_objects,
                      const std::vector<std::string>& provides_requires)
{
  // Write the dependency generation rule.
  this->WriteTargetDependsRule(ruleFileStream, ruleFileName, target, objects);

  std::vector<std::string> commands;

  // Build list of dependencies.
  std::vector<std::string> depends;
  for(std::vector<std::string>::const_iterator obj = objects.begin();
      obj != objects.end(); ++obj)
    {
    depends.push_back(*obj);
    }

  // Add dependencies on targets that must be built first.
  this->AppendTargetDepends(depends, target);

  // Add a dependency on the rule file itself.
  depends.push_back(ruleFileName);

  // Construct the full path to the executable that will be generated.
  std::string targetFullPath = m_ExecutableOutputPath;
  if(targetFullPath.length() == 0)
    {
    targetFullPath = m_Makefile->GetStartOutputDirectory();
    targetFullPath += "/";
    }
#ifdef __APPLE__
  if(target.GetPropertyAsBool("MACOSX_BUNDLE"))
    {
    // Make bundle directories
    targetFullPath += target.GetName();
    targetFullPath += ".app/Contents/MacOS/";
    }
#endif
  targetFullPath += target.GetName();
  targetFullPath += cmSystemTools::GetExecutableExtension();

  // Convert to the output path to use in constructing commands.
  std::string targetOutPath =
    this->ConvertToRelativeOutputPath(targetFullPath.c_str());

  // Get the language to use for linking this executable.
  const char* linkLanguage =
    target.GetLinkerLanguage(this->GetGlobalGenerator());

  // Build a list of compiler flags and linker flags.
  std::string flags;
  std::string linkFlags;

  // Add flags to create an executable.
  this->AddConfigVariableFlags(linkFlags, "CMAKE_EXE_LINKER_FLAGS");
  if(target.GetPropertyAsBool("WIN32_EXECUTABLE"))
    {
    this->AppendFlags(linkFlags,
                      m_Makefile->GetDefinition("CMAKE_CREATE_WIN32_EXE"));
    }
  else
    {
    this->AppendFlags(linkFlags,
                      m_Makefile->GetDefinition("CMAKE_CREATE_CONSOLE_EXE"));
    }

  // Add language-specific flags.
  this->AddLanguageFlags(flags, linkLanguage);

  // Add flags to deal with shared libraries.  Any library being
  // linked in might be shared, so always use shared flags for an
  // executable.
  this->AddSharedFlags(flags, linkLanguage, true);

  // Add target-specific linker flags.
  this->AppendFlags(linkFlags, target.GetProperty("LINK_FLAGS"));

  // TODO: Pre-build and pre-link rules.

  // Construct the main link rule.
  std::string linkRuleVar = "CMAKE_";
  linkRuleVar += linkLanguage;
  linkRuleVar += "_LINK_EXECUTABLE";
  std::string linkRule = m_Makefile->GetRequiredDefinition(linkRuleVar.c_str());
  cmSystemTools::ExpandListArgument(linkRule, commands);

  // Add the post-build rules.
  this->AppendCustomCommands(commands, target.GetPostBuildCommands());

  // Collect up flags to link in needed libraries.
  cmOStringStream linklibs;
  this->OutputLinkLibraries(linklibs, 0, target);

  // Construct object file lists that may be needed to expand the
  // rule.
  std::string variableName;
  std::string variableNameExternal;
  this->WriteObjectsVariable(ruleFileStream, target, objects, external_objects,
                             variableName, variableNameExternal);
  std::string buildObjs = "$(";
  buildObjs += variableName;
  buildObjs += ") $(";
  buildObjs += variableNameExternal;
  buildObjs += ")";
  std::string cleanObjs = "$(";
  cleanObjs += variableName;
  cleanObjs += ")";

  // Expand placeholders in the commands.
  for(std::vector<std::string>::iterator i = commands.begin();
      i != commands.end(); ++i)
    {
    this->ExpandRuleVariables(*i,
                              linkLanguage,
                              buildObjs.c_str(),
                              targetOutPath.c_str(),
                              linklibs.str().c_str(),
                              0,
                              0,
                              flags.c_str(),
                              0,
                              0,
                              0,
                              linkFlags.c_str());
    }

  // Write the build rule.
  std::string buildEcho = "Linking ";
  buildEcho += linkLanguage;
  buildEcho += " executable ";
  buildEcho += targetOutPath;
  buildEcho += "...";
  this->WriteMakeRule(ruleFileStream, 0, buildEcho.c_str(),
                      targetFullPath.c_str(), depends, commands);

  // Write convenience targets.
  this->WriteConvenienceRules(ruleFileStream, target, targetOutPath.c_str());

  // Write clean target.
  std::vector<std::string> cleanFiles;
  cleanFiles.push_back(targetOutPath.c_str());
  cleanFiles.push_back(cleanObjs);
  this->WriteTargetCleanRule(ruleFileStream, target, cleanFiles);

  // Write the driving make target.
  this->WriteTargetRequiresRule(ruleFileStream, target, provides_requires);
}

//----------------------------------------------------------------------------
void
cmLocalUnixMakefileGenerator2
::WriteStaticLibraryRule(std::ostream& ruleFileStream,
                         const char* ruleFileName,
                         const cmTarget& target,
                         const std::vector<std::string>& objects,
                         const std::vector<std::string>& external_objects,
                         const std::vector<std::string>& provides_requires)
{
  const char* linkLanguage =
    target.GetLinkerLanguage(this->GetGlobalGenerator());
  std::string linkRuleVar = "CMAKE_";
  linkRuleVar += linkLanguage;
  linkRuleVar += "_CREATE_STATIC_LIBRARY";

  std::string extraFlags;
  this->AppendFlags(extraFlags, target.GetProperty("STATIC_LIBRARY_FLAGS"));
  this->WriteLibraryRule(ruleFileStream, ruleFileName, target,
                         objects, external_objects,
                         linkRuleVar.c_str(), extraFlags.c_str(),
                         provides_requires);
}

//----------------------------------------------------------------------------
void
cmLocalUnixMakefileGenerator2
::WriteSharedLibraryRule(std::ostream& ruleFileStream,
                         const char* ruleFileName,
                         const cmTarget& target,
                         const std::vector<std::string>& objects,
                         const std::vector<std::string>& external_objects,
                         const std::vector<std::string>& provides_requires)
{
  const char* linkLanguage =
    target.GetLinkerLanguage(this->GetGlobalGenerator());
  std::string linkRuleVar = "CMAKE_";
  linkRuleVar += linkLanguage;
  linkRuleVar += "_CREATE_SHARED_LIBRARY";

  std::string extraFlags;
  this->AppendFlags(extraFlags, target.GetProperty("LINK_FLAGS"));
  this->AddConfigVariableFlags(extraFlags, "CMAKE_SHARED_LINKER_FLAGS");
  if(m_Makefile->IsOn("WIN32") && !(m_Makefile->IsOn("CYGWIN") || m_Makefile->IsOn("MINGW")))
    {
    const std::vector<cmSourceFile*>& sources = target.GetSourceFiles();
    for(std::vector<cmSourceFile*>::const_iterator i = sources.begin();
        i != sources.end(); ++i)
      {
      if((*i)->GetSourceExtension() == "def")
        {
        extraFlags += " ";
        extraFlags += m_Makefile->GetSafeDefinition("CMAKE_LINK_DEF_FILE_FLAG");
        extraFlags += this->ConvertToRelativeOutputPath((*i)->GetFullPath().c_str());
        }
      }
    }
  this->WriteLibraryRule(ruleFileStream, ruleFileName, target,
                         objects, external_objects,
                         linkRuleVar.c_str(), extraFlags.c_str(),
                         provides_requires);
}

//----------------------------------------------------------------------------
void
cmLocalUnixMakefileGenerator2
::WriteModuleLibraryRule(std::ostream& ruleFileStream,
                         const char* ruleFileName,
                         const cmTarget& target,
                         const std::vector<std::string>& objects,
                         const std::vector<std::string>& external_objects,
                         const std::vector<std::string>& provides_requires)
{
  const char* linkLanguage =
    target.GetLinkerLanguage(this->GetGlobalGenerator());
  std::string linkRuleVar = "CMAKE_";
  linkRuleVar += linkLanguage;
  linkRuleVar += "_CREATE_SHARED_MODULE";

  std::string extraFlags;
  this->AppendFlags(extraFlags, target.GetProperty("LINK_FLAGS"));
  this->AddConfigVariableFlags(extraFlags, "CMAKE_MODULE_LINKER_FLAGS");
  // TODO: .def files should be supported here also.
  this->WriteLibraryRule(ruleFileStream, ruleFileName, target,
                         objects, external_objects,
                         linkRuleVar.c_str(), extraFlags.c_str(),
                         provides_requires);
}

//----------------------------------------------------------------------------
void
cmLocalUnixMakefileGenerator2
::WriteLibraryRule(std::ostream& ruleFileStream,
                   const char* ruleFileName,
                   const cmTarget& target,
                   const std::vector<std::string>& objects,
                   const std::vector<std::string>& external_objects,
                   const char* linkRuleVar,
                   const char* extraFlags,
                   const std::vector<std::string>& provides_requires)
{
  // Write the dependency generation rule.
  this->WriteTargetDependsRule(ruleFileStream, ruleFileName, target, objects);

  // TODO: Merge the methods that call this method to avoid
  // code duplication.
  std::vector<std::string> commands;

  // Build list of dependencies.
  std::vector<std::string> depends;
  for(std::vector<std::string>::const_iterator obj = objects.begin();
      obj != objects.end(); ++obj)
    {
    depends.push_back(*obj);
    }
  for(std::vector<std::string>::const_iterator obj = external_objects.begin();
      obj != external_objects.end(); ++obj)
    {
    depends.push_back(*obj);
    }

  // Add dependencies on targets that must be built first.
  this->AppendTargetDepends(depends, target);

  // Add a dependency on the rule file itself.
  depends.push_back(ruleFileName);

  // Create set of linking flags.
  const char* linkLanguage =
    target.GetLinkerLanguage(this->GetGlobalGenerator());
  std::string linkFlags;
  this->AppendFlags(linkFlags, extraFlags);

  // Construct the name of the library.
  std::string targetName;
  std::string targetNameSO;
  std::string targetNameReal;
  std::string targetNameBase;
  this->GetLibraryNames(target.GetName(), target,
                        targetName, targetNameSO,
                        targetNameReal, targetNameBase);

  // Construct the full path version of the names.
  std::string outpath = m_LibraryOutputPath;
  if(outpath.length() == 0)
    {
    outpath = m_Makefile->GetStartOutputDirectory();
    outpath += "/";
    }
  std::string targetFullPath = outpath + targetName;
  std::string targetFullPathSO = outpath + targetNameSO;
  std::string targetFullPathReal = outpath + targetNameReal;
  std::string targetFullPathBase = outpath + targetNameBase;

  // Construct the output path version of the names for use in command
  // arguments.
  std::string targetOutPath = this->ConvertToRelativeOutputPath(targetFullPath.c_str());
  std::string targetOutPathSO = this->ConvertToRelativeOutputPath(targetFullPathSO.c_str());
  std::string targetOutPathReal = this->ConvertToRelativeOutputPath(targetFullPathReal.c_str());
  std::string targetOutPathBase = this->ConvertToRelativeOutputPath(targetFullPathBase.c_str());

  // Add a command to remove any existing files for this library.
  std::vector<std::string> cleanFiles;
  std::string remove = "$(CMAKE_COMMAND) -E remove -f ";
  remove += targetOutPathReal;
  cleanFiles.push_back(targetOutPathReal);
  if(targetOutPathSO != targetOutPathReal)
    {
    remove += " ";
    remove += targetOutPathSO;
    cleanFiles.push_back(targetOutPathSO);
    }
  if(targetOutPath != targetOutPathSO &&
     targetOutPath != targetOutPathReal)
    {
    remove += " ";
    remove += targetOutPath;
    cleanFiles.push_back(targetOutPath);
    }
  commands.push_back(remove);

  // TODO: Pre-build and pre-link rules.

  // Construct the main link rule.
  std::string linkRule = m_Makefile->GetRequiredDefinition(linkRuleVar);
  cmSystemTools::ExpandListArgument(linkRule, commands);

  // Add a rule to create necessary symlinks for the library.
  if(targetOutPath != targetOutPathReal)
    {
    std::string symlink = "$(CMAKE_COMMAND) -E cmake_symlink_library ";
    symlink += targetOutPathReal;
    symlink += " ";
    symlink += targetOutPathSO;
    symlink += " ";
    symlink += targetOutPath;
    commands.push_back(symlink);
    }

  // Add the post-build rules.
  this->AppendCustomCommands(commands, target.GetPostBuildCommands());

  // Collect up flags to link in needed libraries.
  cmOStringStream linklibs;
  this->OutputLinkLibraries(linklibs, target.GetName(), target);

  // Construct object file lists that may be needed to expand the
  // rule.
  std::string variableName;
  std::string variableNameExternal;
  this->WriteObjectsVariable(ruleFileStream, target, objects, external_objects,
                             variableName, variableNameExternal);
  std::string buildObjs = "$(";
  buildObjs += variableName;
  buildObjs += ") $(";
  buildObjs += variableNameExternal;
  buildObjs += ")";
  std::string cleanObjs = "$(";
  cleanObjs += variableName;
  cleanObjs += ")";

  // Expand placeholders in the commands.
  for(std::vector<std::string>::iterator i = commands.begin();
      i != commands.end(); ++i)
    {
    // TODO: Fix target output paths to use "cd...;pwd" idiom to pass
    // a full path to the linker.  This should be done by identifying
    // a relative path and stripping the directory part off to put in
    // this format.  This rule is the only place that this idiom is
    // needed.
    this->ExpandRuleVariables(*i,
                              linkLanguage,
                              buildObjs.c_str(),
                              targetOutPathReal.c_str(),
                              linklibs.str().c_str(),
                              0, 0, 0, buildObjs.c_str(),
                              targetOutPathBase.c_str(),
                              targetNameSO.c_str(),
                              linkFlags.c_str());
    }

  // Write the build rule.
  std::string buildEcho = "Linking ";
  buildEcho += linkLanguage;
  switch(target.GetType())
    {
    case cmTarget::STATIC_LIBRARY:
      buildEcho += " static library "; break;
    case cmTarget::SHARED_LIBRARY:
      buildEcho += " shared library "; break;
    case cmTarget::MODULE_LIBRARY:
      buildEcho += " shared module "; break;
    default:
      buildEcho += " library "; break;
    }
  buildEcho += targetOutPath.c_str();
  buildEcho += "...";
  this->WriteMakeRule(ruleFileStream, 0, buildEcho.c_str(),
                      targetFullPath.c_str(), depends, commands);

  // Write convenience targets.
  this->WriteConvenienceRules(ruleFileStream, target, targetOutPath.c_str());

  // Write clean target.
  cleanFiles.push_back(cleanObjs);
  this->WriteTargetCleanRule(ruleFileStream, target, cleanFiles);

  // Write the driving make target.
  this->WriteTargetRequiresRule(ruleFileStream, target, provides_requires);
}

//----------------------------------------------------------------------------
void
cmLocalUnixMakefileGenerator2
::WriteObjectsVariable(std::ostream& ruleFileStream,
                       const cmTarget& target,
                       const std::vector<std::string>& objects,
                       const std::vector<std::string>& external_objects,
                       std::string& variableName,
                       std::string& variableNameExternal)
{
  // Write a make variable assignment that lists all objects for the
  // target.
  variableName = this->CreateMakeVariable(target.GetName(), "_OBJECTS");
  ruleFileStream
    << "# Object files for target " << target.GetName() << "\n"
    << variableName.c_str() << " =";
  for(std::vector<std::string>::const_iterator i = objects.begin();
      i != objects.end(); ++i)
    {
    ruleFileStream
      << " \\\n"
      << "\"" << this->ConvertToRelativeOutputPath(i->c_str()) << "\"";
    }
  ruleFileStream
    << "\n";

  // Write a make variable assignment that lists all external objects
  // for the target.
  variableNameExternal = this->CreateMakeVariable(target.GetName(),
                                                  "_EXTERNAL_OBJECTS");
  ruleFileStream
    << "# External object files for target " << target.GetName() << "\n"
    << variableNameExternal.c_str() << " =";
  for(std::vector<std::string>::const_iterator i = external_objects.begin();
      i != external_objects.end(); ++i)
    {
    ruleFileStream
      << " \\\n"
      << "\"" << this->ConvertToRelativeOutputPath(i->c_str()) << "\"";
    }
  ruleFileStream
    << "\n"
    << "\n";
}

//----------------------------------------------------------------------------
void
cmLocalUnixMakefileGenerator2
::WriteTargetDependsRule(std::ostream& ruleFileStream,
                         const char* ruleFileName,
                         const cmTarget& target,
                         const std::vector<std::string>& objects)
{
  std::vector<std::string> depends;
  std::vector<std::string> no_commands;

  // Construct the output message for the rule.
  std::string depEcho = "Building dependencies for ";
  depEcho += target.GetName();
  depEcho += "...";

  // Construct the name of the dependency generation target.
  std::string depTarget = this->GetTargetDirectory(target);
  depTarget += "/";
  depTarget += target.GetName();
  depTarget += ".depends";

  // This target drives dependency generation for all object files.
  for(std::vector<std::string>::const_iterator obj = objects.begin();
      obj != objects.end(); ++obj)
    {
    depends.push_back((*obj)+".depends");
    }

  // Depend on the rule file itself.
  depends.push_back(ruleFileName);

  // Write the rule.
  this->WriteMakeRule(ruleFileStream, 0, depEcho.c_str(),
                      depTarget.c_str(), depends, no_commands);

  // Add this to the list of depend rules in this directory.
  if(target.IsInAll())
    {
    m_DependTargets.push_back(depTarget);
    }
}

//----------------------------------------------------------------------------
void
cmLocalUnixMakefileGenerator2
::WriteTargetCleanRule(std::ostream& ruleFileStream,
                       const cmTarget& target,
                       const std::vector<std::string>& files)
{
  std::vector<std::string> no_depends;
  std::vector<std::string> commands;

  // TODO: Add registered files for cleaning.

  // Construct the clean target name.
  std::string cleanTarget = target.GetName();
  cleanTarget += ".clean";

  // Construct the clean command.
  std::string remove = "$(CMAKE_COMMAND) -E remove -f";
  for(std::vector<std::string>::const_iterator f = files.begin();
      f != files.end(); ++f)
    {
    remove += " ";
    remove += *f;
    }
  commands.push_back(remove);

  // Write the rule.
  this->WriteMakeRule(ruleFileStream, 0, 0, cleanTarget.c_str(),
                      no_depends, commands);

  // Add this to the list of clean rules in this directory.
  if(target.IsInAll())
    {
    m_CleanTargets.push_back(cleanTarget);
    }
}

//----------------------------------------------------------------------------
void
cmLocalUnixMakefileGenerator2
::WriteTargetRequiresRule(std::ostream& ruleFileStream, const cmTarget& target,
                          const std::vector<std::string>& provides_requires)
{
  // Create the driving make target.
  std::string targetRequires = target.GetName();
  targetRequires += ".requires";
  if(provides_requires.empty())
    {
    // No provides-requires mode objects in this target.  Anything
    // that requires the target can build it directly.
    std::vector<std::string> no_commands;
    std::vector<std::string> depends;
    depends.push_back(target.GetName());
    this->WriteMakeRule(ruleFileStream, 0, 0,
                        targetRequires.c_str(), depends, no_commands);
    }
  else
    {
    // There are provides-requires mode objects in this target.  Use
    // provides-requires mode to build the target itself.
    std::string targetProvides = target.GetName();
    targetProvides += ".provides";
    {
    std::vector<std::string> no_commands;
    std::vector<std::string> depends;
    depends.push_back(target.GetName());
    this->WriteMakeRule(ruleFileStream, 0, 0,
                        targetProvides.c_str(), depends, no_commands);
    }
    {
    // Build list of require-level dependencies.
    std::vector<std::string> depends;
    for(std::vector<std::string>::const_iterator
          pr = provides_requires.begin();
        pr != provides_requires.end(); ++pr)
      {
      depends.push_back(*pr);
      }

    std::vector<std::string> commands;
    commands.push_back(this->GetRecursiveMakeCall(targetProvides.c_str()));
    this->WriteMakeRule(ruleFileStream, 0, 0,
                        targetRequires.c_str(), depends, commands);
    }
    }

  // Add this to the list of build rules in this directory.
  if(target.IsInAll())
    {
    m_BuildTargets.push_back(targetRequires);
    }
}

//----------------------------------------------------------------------------
void
cmLocalUnixMakefileGenerator2
::WriteCMakeArgument(std::ostream& os, const char* s)
{
  // Write the given string to the stream with escaping to get it back
  // into CMake through the lexical scanner.
  os << "\"";
  for(const char* c = s; *c; ++c)
    {
    if(*c == '\\')
      {
      os << "\\\\";
      }
    else if(*c == '"')
      {
      os << "\\\"";
      }
    else
      {
      os << *c;
      }
    }
  os << "\"";
}

//----------------------------------------------------------------------------
std::string
cmLocalUnixMakefileGenerator2
::GetTargetDirectory(const cmTarget& target)
{
  std::string dir = target.GetName();
  dir += ".dir";
  return dir;
}

//----------------------------------------------------------------------------
std::string
cmLocalUnixMakefileGenerator2
::GetSubdirTargetName(const char* pass, const char* subdir)
{
  // Convert the subdirectory name to a valid make target name.
  std::string s = pass;
  s += "_";
  s += subdir;

  // Replace "../" with 3 underscores.  This allows one .. at the beginning.
  size_t pos = s.find("../");
  if(pos != std::string::npos)
    {
    s.replace(pos, 3, "___");
    }

  // Replace "/" directory separators with a single underscore.
  while((pos = s.find('/')) != std::string::npos)
    {
    s.replace(pos, 1, "_");
    }
  return s;
}

//----------------------------------------------------------------------------
std::string
cmLocalUnixMakefileGenerator2
::GetObjectFileName(const cmTarget& target,
                    const cmSourceFile& source)
{
  // If the full path to the source file includes this directory,
  // we want to use the relative path for the filename of the
  // object file.  Otherwise, we will use just the filename
  // portion.
  std::string objectName;
  if((cmSystemTools::GetFilenamePath(
        source.GetFullPath()).find(
          m_Makefile->GetCurrentDirectory()) == 0)
     || (cmSystemTools::GetFilenamePath(
           source.GetFullPath()).find(
             m_Makefile->GetStartOutputDirectory()) == 0))
    {
    objectName = source.GetSourceName();
    }
  else
    {
    objectName = cmSystemTools::GetFilenameName(source.GetSourceName());
    }

  // Append the object file extension.
  objectName +=
    m_GlobalGenerator->GetLanguageOutputExtensionFromExtension(
      source.GetSourceExtension().c_str());

  // Convert to a safe name.
  objectName = this->CreateSafeUniqueObjectFileName(objectName.c_str());

  // Prepend the target directory.
  std::string obj = this->GetTargetDirectory(target);
  obj += "/";
  obj += objectName;
  return obj;
}

//----------------------------------------------------------------------------
std::string
cmLocalUnixMakefileGenerator2
::GetCustomBaseName(const cmCustomCommand& cc)
{
  // If the full path to the output file includes this build
  // directory, we want to use the relative path for the filename of
  // the custom file.  Otherwise, we will use just the filename
  // portion.
  std::string customName;
  if(cmSystemTools::FileIsFullPath(cc.GetOutput().c_str()) &&
     (cc.GetOutput().find(m_Makefile->GetStartOutputDirectory()) == 0))
    {
    // Use the relative path but convert it to a valid file name.
    customName =
      cmSystemTools::RelativePath(m_Makefile->GetStartOutputDirectory(),
                                  cc.GetOutput().c_str());
    cmSystemTools::ReplaceString(customName, "/", "_");
    }
  else
    {
    customName = cmSystemTools::GetFilenameName(cc.GetOutput().c_str());
    }
  return customName;
}

//----------------------------------------------------------------------------
const char*
cmLocalUnixMakefileGenerator2
::GetSourceFileLanguage(const cmSourceFile& source)
{
  // Identify the language of the source file.
  return (m_GlobalGenerator
          ->GetLanguageFromExtension(source.GetSourceExtension().c_str()));
}

//----------------------------------------------------------------------------
std::string
cmLocalUnixMakefileGenerator2
::ConvertToFullPath(const std::string& localPath)
{
  std::string dir = m_Makefile->GetStartOutputDirectory();
  dir += "/";
  dir += localPath;
  return dir;
}

//----------------------------------------------------------------------------
std::string
cmLocalUnixMakefileGenerator2::ConvertToRelativePath(const char* p)
{
  // The path should never be quoted.
  assert(p[0] != '\"');

  // If the path is already relative or relative paths are disabled
  // then just return the path.
  if(m_RelativePathTop.size() == 0 || !cmSystemTools::FileIsFullPath(p))
    {
    return p;
    }

  // If the path does not begin with the minimum relative path prefix
  // then do not convert it.
  std::string original = p;
  if(original.size() < m_RelativePathTop.size() ||
     !this->ComparePath(original.substr(0, m_RelativePathTop.size()).c_str(),
                        m_RelativePathTop.c_str()))
    {
    return p;
    }

  // Identify the longest shared path component between the given path
  // and the current output directory.
  std::vector<std::string> path;
  this->SplitFullPath(p, path);
  unsigned int common=0;
  while(common < path.size() &&
        common < m_CurrentOutputDirectoryComponents.size() &&
        this->ComparePath(path[common].c_str(),
                          m_CurrentOutputDirectoryComponents[common].c_str()))
    {
    ++common;
    }

  // If the entire path is in common then just return a ".".
  if(common == path.size() &&
     common == m_CurrentOutputDirectoryComponents.size())
    {
    return ".";
    }

  // If the entire path is in common except for a trailing slash then
  // just return a "./".
  if(common+1 == path.size() && path[common].size() == 0 &&
     common == m_CurrentOutputDirectoryComponents.size())
    {
    return "./";
    }

  // Construct the relative path.
  std::string relative;

  // First add enough ../ to get up to the level of the shared portion
  // of the path.  Leave off the trailing slash.  Note that the last
  // component of m_CurrentOutputDirectoryComponents will never be
  // empty because m_CurrentOutputDirectory does not have a trailing
  // slash.
  for(unsigned int i=common; i < m_CurrentOutputDirectoryComponents.size(); ++i)
    {
    relative += "..";
    if(i < m_CurrentOutputDirectoryComponents.size()-1)
      {
      relative += "/";
      }
    }

  // Now add the portion of the destination path that is not included
  // in the shared portion of the path.  Add a slash the first time
  // only if there was already something in the path.  If there was a
  // trailing slash in the input then the last iteration of the loop
  // will add a slash followed by an empty string which will preserve
  // the trailing slash in the output.
  for(unsigned int i=common; i < path.size(); ++i)
    {
    if(relative.size() > 0)
      {
      relative += "/";
      }
    relative += path[i];
    }

  // Finally return the path.
  return relative;
}

//----------------------------------------------------------------------------
std::string
cmLocalUnixMakefileGenerator2::ConvertToRelativeOutputPath(const char* p)
{
  // Convert the path to a relative path.
  std::string relative = this->ConvertToRelativePath(p);

  // Now convert it to an output path.
  return cmSystemTools::ConvertToOutputPath(relative.c_str());
}

//----------------------------------------------------------------------------
void
cmLocalUnixMakefileGenerator2::ConfigureOutputPaths()
{
  // Call superclass version first.
  this->cmLocalUnixMakefileGenerator::ConfigureOutputPaths();

  // Setup fully collapsed paths.
  m_CurrentOutputDirectory =
    cmSystemTools::CollapseFullPath(m_Makefile->GetCurrentOutputDirectory());
  m_HomeOutputDirectory =
    cmSystemTools::CollapseFullPath(m_Makefile->GetHomeOutputDirectory());
  m_HomeDirectory =
    cmSystemTools::CollapseFullPath(m_Makefile->GetHomeDirectory());

  // Identify the longest shared path component between the source
  // directory and the build directory.
  std::vector<std::string> source;
  std::vector<std::string> binary;
  this->SplitFullPath(m_HomeDirectory.c_str(), source);
  this->SplitFullPath(m_HomeOutputDirectory.c_str(), binary);
  unsigned int common=0;
  while(common < source.size() && common < binary.size() &&
        this->ComparePath(source[common].c_str(), binary[common].c_str()))
    {
    ++common;
    }

  // Require more than just the root portion of the path to be in
  // common before allowing relative paths.  Also disallow relative
  // paths if the build tree is a network path.  The current working
  // directory on Windows cannot be a network path.  Therefore
  // relative paths cannot work with network paths.
  if(common > 1 && source[0] != "//")
    {
    // Build the minimum prefix required of a path to be converted to
    // a relative path.
    m_RelativePathTop = source[0];
    for(unsigned int i=1; i < common; ++i)
      {
      if(i > 1)
        {
        m_RelativePathTop += "/";
        }
      m_RelativePathTop += source[i];
      }

    // Split the current output directory now to save time when
    // converting paths.
    this->SplitFullPath(m_CurrentOutputDirectory.c_str(),
                        m_CurrentOutputDirectoryComponents);
    }
}

//----------------------------------------------------------------------------
void
cmLocalUnixMakefileGenerator2
::SplitFullPath(const char* p, std::vector<std::string>& components)
{
  // The path is split into its basic components.  This starts with a
  // root ("/" for UNIX, "c:/" for Windows, "//" for Network) and is
  // followed by the directory names.  If there is a trailing slash
  // then the last component is the empty string.  The components can
  // be recombined as "c[0]c[1]/c[2]/.../c[n]".
  assert(cmSystemTools::FileIsFullPath(p));

  // Identify the root component.
  const char* c = p;
  if(c[0] == '/' && c[1] == '/')
    {
    // Network path.
    components.push_back("//");
    c += 2;
    }
  else if(c[0] == '/')
    {
    // Unix path.
    components.push_back("/");
    c += 1;
    }
  else if(c[0] && c[1] == ':' && c[2] == '/')
    {
    // Windows path.
    std::string root = "_:/";
    root[0] = c[0];
    components.push_back(root);
    c += 3;
    }
  else
    {
    // Already a relative path.
    cmSystemTools::Error("SplitFullPath called with path ", p);
    return;
    }

  // Parse the remaining components.
  const char* first = c;
  const char* last = first;
  for(;*last; ++last)
    {
    if(*last == '/')
      {
      // End of a component.  Save it.
      components.push_back(std::string(first, last-first));
      first = last+1;
      }
    }
  // Save the last component unless there were no components.
  if(last != c)
    {
    components.push_back(std::string(first, last-first));
    }
}

//----------------------------------------------------------------------------
bool cmLocalUnixMakefileGenerator2::ComparePath(const char* c1, const char* c2)
{
#if defined(_WIN32) || defined(__APPLE__)
  return cmSystemTools::Strucmp(c1, c2) == 0;
#else
  return strcmp(c1, c2) == 0;
#endif
}

//----------------------------------------------------------------------------
void
cmLocalUnixMakefileGenerator2
::AppendTargetDepends(std::vector<std::string>& depends,
                      const cmTarget& target)
{
  // Do not bother with dependencies for static libraries.
  if(target.GetType() == cmTarget::STATIC_LIBRARY)
    {
    return;
    }

  // Keep track of dependencies already listed.
  std::set<cmStdString> emitted;

  // A target should not depend on itself.
  emitted.insert(target.GetName());

  // Loop over all library dependencies.
  const cmTarget::LinkLibraries& tlibs = target.GetLinkLibraries();
  for(cmTarget::LinkLibraries::const_iterator lib = tlibs.begin();
      lib != tlibs.end(); ++lib)
    {
    // Don't emit the same library twice for this target.
    if(emitted.insert(lib->first).second)
      {
      // Add this dependency.
      this->AppendAnyDepend(depends, lib->first.c_str());
      }
    }

  // Loop over all utility dependencies.
  const std::set<cmStdString>& tutils = target.GetUtilities();
  for(std::set<cmStdString>::const_iterator util = tutils.begin();
      util != tutils.end(); ++util)
    {
    // Don't emit the same utility twice for this target.
    if(emitted.insert(*util).second)
      {
      // Add this dependency.
      this->AppendAnyDepend(depends, util->c_str());
      }
    }
}

//----------------------------------------------------------------------------
void
cmLocalUnixMakefileGenerator2
::AppendAnyDepend(std::vector<std::string>& depends, const char* name)
{
  // There are a few cases for the name of the target:
  //  - CMake target in this directory: depend on it.
  //  - CMake target in another directory: depend and add jump-and-build.
  //  - Full path to a file: depend on it.
  //  - Other format (like -lm): do nothing.

  // If it is an executable or library target there will be a
  // definition for it.
  std::string dirVar = name;
  dirVar += "_CMAKE_PATH";
  const char* dir = m_Makefile->GetDefinition(dirVar.c_str());
  if(dir && *dir)
    {
    // This is a CMake target somewhere in this project.
    bool jumpAndBuild = false;

    // Get the type of the library.  If it does not have a type then
    // it is an executable.
    std::string typeVar = name;
    typeVar += "_LIBRARY_TYPE";
    const char* libType = m_Makefile->GetDefinition(typeVar.c_str());

    // Get the output path for this target type.
    std::string tgtOutputPath;
    if(libType)
      {
      tgtOutputPath = m_LibraryOutputPath;
      }
    else
      {
      tgtOutputPath = m_ExecutableOutputPath;
      }

    // Get the path to the target.
    std::string tgtPath;
    if(this->SamePath(m_Makefile->GetStartOutputDirectory(), dir))
      {
      // The target is in the current directory so this makefile will
      // know about it already.
      tgtPath = tgtOutputPath;
      }
    else
      {
      // The target is in another directory.  Get the path to it.
      if(tgtOutputPath.size())
        {
        tgtPath = tgtOutputPath;
        }
      else
        {
        tgtPath = dir;
        tgtPath += "/";
        }

      // We need to add a jump-and-build rule for this library.
      jumpAndBuild = true;
      }

    // Add the name of the targets's file.  This depends on the type
    // of the target.
    std::string prefix;
    std::string suffix;
    if(!libType)
      {
      suffix = cmSystemTools::GetExecutableExtension();
      }
    else if(strcmp(libType, "SHARED") == 0)
      {
      prefix = m_Makefile->GetSafeDefinition("CMAKE_SHARED_LIBRARY_PREFIX");
      suffix = m_Makefile->GetSafeDefinition("CMAKE_SHARED_LIBRARY_SUFFIX");
      }
    else if(strcmp(libType, "MODULE") == 0)
      {
      prefix = m_Makefile->GetSafeDefinition("CMAKE_SHARED_MODULE_PREFIX");
      suffix = m_Makefile->GetSafeDefinition("CMAKE_SHARED_MODULE_SUFFIX");
      }
    else if(strcmp(libType, "STATIC") == 0)
      {
      prefix = m_Makefile->GetSafeDefinition("CMAKE_STATIC_LIBRARY_PREFIX");
      suffix = m_Makefile->GetSafeDefinition("CMAKE_STATIC_LIBRARY_SUFFIX");
      }
    tgtPath += prefix;
    tgtPath += name;
    tgtPath += suffix;

    if(jumpAndBuild)
      {
      // We need to add a jump-and-build rule for this target.
      cmLocalUnixMakefileGenerator2::RemoteTarget rt;
      rt.m_BuildDirectory = dir;
      rt.m_FilePath = tgtPath;
      m_JumpAndBuild[name] = rt;
      }

    // Add a dependency on the target.
    depends.push_back(tgtPath.c_str());
    }
  else if(m_Makefile->GetTargets().find(name) !=
          m_Makefile->GetTargets().end())
    {
    // This is a CMake target that is not an executable or library.
    // It must be in this directory, so just depend on the name
    // directly.
    depends.push_back(name);
    }
  else if(cmSystemTools::FileIsFullPath(name))
    {
    // This is a path to a file.  Just trust that it will be present.
    depends.push_back(name);
    }
}

//----------------------------------------------------------------------------
void
cmLocalUnixMakefileGenerator2
::AppendCustomDepends(std::vector<std::string>& depends,
                      const std::vector<cmCustomCommand>& ccs)
{
  for(std::vector<cmCustomCommand>::const_iterator i = ccs.begin();
      i != ccs.end(); ++i)
    {
    this->AppendCustomDepend(depends, *i);
    }
}

//----------------------------------------------------------------------------
void
cmLocalUnixMakefileGenerator2
::AppendCustomDepend(std::vector<std::string>& depends,
                     const cmCustomCommand& cc)
{
  for(std::vector<std::string>::const_iterator d = cc.GetDepends().begin();
      d != cc.GetDepends().end(); ++d)
    {
    // Add this dependency.
    this->AppendAnyDepend(depends, d->c_str());
    }
}

//----------------------------------------------------------------------------
void
cmLocalUnixMakefileGenerator2
::AppendCustomCommands(std::vector<std::string>& commands,
                       const std::vector<cmCustomCommand>& ccs)
{
  for(std::vector<cmCustomCommand>::const_iterator i = ccs.begin();
      i != ccs.end(); ++i)
    {
    this->AppendCustomCommand(commands, *i);
    }
}

//----------------------------------------------------------------------------
void
cmLocalUnixMakefileGenerator2
::AppendCustomCommand(std::vector<std::string>& commands,
                      const cmCustomCommand& cc)
{
  // TODO: Convert outputs/dependencies (arguments?) to relative paths.

  // Build the command line in a single string.
  std::string cmd = cc.GetCommand();
  cmSystemTools::ReplaceString(cmd, "/./", "/");
  cmd = this->ConvertToRelativeOutputPath(cmd.c_str());
  if(cc.GetArguments().size() > 0)
    {
    cmd += " ";
    cmd += cc.GetArguments();
    }
  commands.push_back(cmd);
}

//----------------------------------------------------------------------------
std::string
cmLocalUnixMakefileGenerator2
::GetRecursiveMakeCall(const char* tgt)
{
  // Call make on the given file.
  std::string cmd;
  cmd += "$(MAKE) -f " CMLUMG_MAKEFILE_NAME " ";

  // Pass down verbosity level.
  if(m_MakeSilentFlag.size())
    {
    cmd += m_MakeSilentFlag;
    cmd += " ";
    }

  // Most unix makes will pass the command line flags to make down to
  // sub-invoked makes via an environment variable.  However, some
  // makes do not support that, so you have to pass the flags
  // explicitly.
  if(m_PassMakeflags)
    {
    cmd += "-$(MAKEFLAGS) ";
    }

  // Add the target.
  cmd += tgt;

  return cmd;
}

//----------------------------------------------------------------------------
void
cmLocalUnixMakefileGenerator2
::WriteJumpAndBuildRules(std::ostream& makefileStream)
{
  // Write the header for this section.
  if(!m_JumpAndBuild.empty())
    {
    this->WriteDivider(makefileStream);
    makefileStream
      << "# Targets to make sure needed libraries exist.\n"
      << "# These will jump to other directories to build targets.\n"
      << "\n";
    }

  std::vector<std::string> depends;
  std::vector<std::string> commands;
  for(std::map<cmStdString, RemoteTarget>::iterator
        jump = m_JumpAndBuild.begin(); jump != m_JumpAndBuild.end(); ++jump)
    {
    const cmLocalUnixMakefileGenerator2::RemoteTarget& rt = jump->second;
    const char* destination = rt.m_BuildDirectory.c_str();

    // Construct the dependency and build target names.
    std::string dep = jump->first;
    dep += ".dir/";
    dep += jump->first;
    dep += ".depends";
    dep = this->ConvertToRelativeOutputPath(dep.c_str());
    std::string tgt = jump->first;
    tgt += ".requires";
    tgt = this->ConvertToRelativeOutputPath(tgt.c_str());

    // Build the jump-and-build command list.
    commands.clear();
    if(m_WindowsShell)
      {
      // On Windows we must perform each step separately and then jump
      // back because the shell keeps the working directory between
      // commands.
      std::string cmd = "cd ";
      cmd += this->ConvertToOutputForExisting(destination);
      commands.push_back(cmd);

      // Check the build system in destination directory.
      commands.push_back(this->GetRecursiveMakeCall("cmake_check_build_system"));

      // Build the targets's dependencies.
      commands.push_back(this->GetRecursiveMakeCall(dep.c_str()));

      // Build the target.
      commands.push_back(this->GetRecursiveMakeCall(tgt.c_str()));

      // Jump back to the starting directory.
      cmd = "cd ";
      cmd += this->ConvertToOutputForExisting(m_Makefile->GetStartOutputDirectory());
      commands.push_back(cmd);
      }
    else
      {
      // On UNIX we must construct a single shell command to jump and
      // build because make resets the directory between each command.
      std::string cmd = "cd ";
      cmd += this->ConvertToOutputForExisting(destination);

      // Check the build system in destination directory.
      cmd += " && ";
      cmd += this->GetRecursiveMakeCall("cmake_check_build_system");

      // Build the targets's dependencies.
      cmd += " && ";
      cmd += this->GetRecursiveMakeCall(dep.c_str());

      // Build the target.
      cmd += " && ";
      cmd += this->GetRecursiveMakeCall(tgt.c_str());

      // Add the command as a single line.
      commands.push_back(cmd);
      }

    // Write the rule.
    std::string jumpPreEcho = "Jumping to ";
    jumpPreEcho += rt.m_BuildDirectory.c_str();
    jumpPreEcho += " to build ";
    jumpPreEcho += jump->first;
    jumpPreEcho += "...";
    std::string jumpPostEcho = "Returning to ";
    jumpPostEcho += m_Makefile->GetStartOutputDirectory();
    jumpPostEcho += "...";
    this->WriteMakeRule(makefileStream, 0, jumpPreEcho.c_str(),
                        rt.m_FilePath.c_str(), depends, commands,
                        jumpPostEcho.c_str());
    }
}

//----------------------------------------------------------------------------
cmDepends*
cmLocalUnixMakefileGenerator2::GetDependsChecker(const std::string& lang,
                                                 const char* dir,
                                                 const char* objFile)
{
  if(lang == "C" || lang == "CXX" || lang == "RC")
    {
    return new cmDependsC(dir, objFile);
    }
#ifdef CMAKE_BUILD_WITH_CMAKE
  else if(lang == "Fortran")
    {
    return new cmDependsFortran(dir, objFile);
    }
#endif
  return 0;
}

//----------------------------------------------------------------------------
bool
cmLocalUnixMakefileGenerator2
::ScanDependencies(std::vector<std::string> const& args)
{
  // Format of arguments is:
  // $(CMAKE_COMMAND), cmake_depends, <lang>, <obj>, <src>
  // The caller has ensured that all required arguments exist.

  // The language for which we are scanning dependencies.
  std::string const& lang = args[2];

  // The file to which to write dependencies.
  const char* objFile = args[3].c_str();

  // The source file at which to start the scan.
  const char* srcFile = args[4].c_str();

  // Read the directory information file.
  cmake cm;
  cmGlobalGenerator gg;
  gg.SetCMakeInstance(&cm);
  std::auto_ptr<cmLocalGenerator> lg(gg.CreateLocalGenerator());
  lg->SetGlobalGenerator(&gg);
  cmMakefile* mf = lg->GetMakefile();
  bool haveDirectoryInfo = false;
  if(mf->ReadListFile(0, "CMakeDirectoryInformation.cmake") &&
     !cmSystemTools::GetErrorOccuredFlag())
    {
    haveDirectoryInfo = true;
    }

  // Get the set of include directories.
  std::vector<std::string> includes;
  if(haveDirectoryInfo)
    {
    std::string includePathVar = "CMAKE_";
    includePathVar += lang;
    includePathVar += "_INCLUDE_PATH";
    if(const char* includePath = mf->GetDefinition(includePathVar.c_str()))
      {
      cmSystemTools::ExpandListArgument(includePath, includes);
      }
    }

  // Get the include file regular expression.
  std::string includeRegexScan = "^.*$";
  std::string includeRegexComplain = "^$";
  if(haveDirectoryInfo)
    {
    std::string scanRegexVar = "CMAKE_";
    scanRegexVar += lang;
    scanRegexVar += "_INCLUDE_REGEX_SCAN";
    if(const char* scanRegex = mf->GetDefinition(scanRegexVar.c_str()))
      {
      includeRegexScan = scanRegex;
      }
    std::string complainRegexVar = "CMAKE_";
    complainRegexVar += lang;
    complainRegexVar += "_INCLUDE_REGEX_COMPLAIN";
    if(const char* complainRegex = mf->GetDefinition(complainRegexVar.c_str()))
      {
      includeRegexComplain = complainRegex;
      }
    }

  // Dispatch the scan for each language.
  if(lang == "C" || lang == "CXX" || lang == "RC")
    {
    // TODO: Handle RC (resource files) dependencies correctly.
    cmDependsC scanner(".", objFile, srcFile, includes,
                       includeRegexScan.c_str(), includeRegexComplain.c_str());
    return scanner.Write();
    }
#ifdef CMAKE_BUILD_WITH_CMAKE
  else if(lang == "Fortran")
    {
    cmDependsFortran scanner(".", objFile, srcFile, includes);
    return scanner.Write();
    }
#endif
  return false;
}

//----------------------------------------------------------------------------
void cmLocalUnixMakefileGenerator2::CheckDependencies(cmMakefile* mf)
{
  // Get the list of languages that may have sources to check.
  const char* langDef = mf->GetDefinition("CMAKE_DEPENDS_LANGUAGES");
  if(!langDef)
    {
    return;
    }
  std::vector<std::string> languages;
  cmSystemTools::ExpandListArgument(langDef, languages);

  // For each language get the set of files to check.
  for(std::vector<std::string>::iterator l = languages.begin();
      l != languages.end(); ++l)
    {
    std::string depCheck = "CMAKE_DEPENDS_CHECK_";
    depCheck += *l;
    if(const char* fileDef = mf->GetDefinition(depCheck.c_str()))
      {
      // Check each file.  The current working directory is already
      // correct.
      std::vector<std::string> files;
      cmSystemTools::ExpandListArgument(fileDef, files);
      for(std::vector<std::string>::iterator f = files.begin();
          f != files.end(); ++f)
        {
        // Construct a checker for the given language.
        std::auto_ptr<cmDepends>
          checker(cmLocalUnixMakefileGenerator2
                  ::GetDependsChecker(*l, ".", f->c_str()));
        if(checker.get())
          {
          checker->Check();
          }
        }
      }
    }
}