cmake.cxx

/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
   file Copyright.txt or https://cmake.org/licensing for details.  */
#include "cmake.h"

#include "cmAlgorithms.h"
#include "cmCommands.h"
#include "cmDocumentation.h"
#include "cmDocumentationEntry.h"
#include "cmDocumentationFormatter.h"
#include "cmExternalMakefileProjectGenerator.h"
#include "cmFileTimeComparison.h"
#include "cmGeneratorTarget.h"
#include "cmGlobalGenerator.h"
#include "cmGlobalGeneratorFactory.h"
#include "cmLocalGenerator.h"
#include "cmMakefile.h"
#include "cmMessenger.h"
#include "cmState.h"
#include "cmSystemTools.h"
#include "cmTarget.h"
#include "cmTargetLinkLibraryType.h"
#include "cmUtils.hxx"
#include "cmVersionConfig.h"
#include "cm_auto_ptr.hxx"

#if defined(CMAKE_BUILD_WITH_CMAKE)
#include "cmGraphVizWriter.h"
#include "cmVariableWatch.h"

#include <cm_jsoncpp_writer.h>
#endif

// only build kdevelop generator on non-windows platforms
// when not bootstrapping cmake
#if !defined(_WIN32)
#if defined(CMAKE_BUILD_WITH_CMAKE)
#define CMAKE_USE_KDEVELOP
#endif
#endif

#if defined(CMAKE_BUILD_WITH_CMAKE)
#define CMAKE_USE_ECLIPSE
#endif

#if defined(__MINGW32__) && !defined(CMAKE_BUILD_WITH_CMAKE)
#define CMAKE_BOOT_MINGW
#endif

// include the generator
#if defined(_WIN32) && !defined(__CYGWIN__)
#if !defined(CMAKE_BOOT_MINGW)
#include "cmGlobalBorlandMakefileGenerator.h"
#include "cmGlobalGhsMultiGenerator.h"
#include "cmGlobalJOMMakefileGenerator.h"
#include "cmGlobalNMakeMakefileGenerator.h"
#include "cmGlobalVisualStudio10Generator.h"
#include "cmGlobalVisualStudio11Generator.h"
#include "cmGlobalVisualStudio12Generator.h"
#include "cmGlobalVisualStudio14Generator.h"
#include "cmGlobalVisualStudio15Generator.h"
#include "cmGlobalVisualStudio71Generator.h"
#include "cmGlobalVisualStudio8Generator.h"
#include "cmGlobalVisualStudio9Generator.h"

#define CMAKE_HAVE_VS_GENERATORS
#endif
#include "cmGlobalMSYSMakefileGenerator.h"
#include "cmGlobalMinGWMakefileGenerator.h"
#else
#endif
#if defined(CMAKE_USE_WMAKE)
#include "cmGlobalWatcomWMakeGenerator.h"
#endif
#include "cmGlobalUnixMakefileGenerator3.h"
#if defined(CMAKE_BUILD_WITH_CMAKE)
#include "cmGlobalNinjaGenerator.h"
#endif
#include "cmExtraCodeLiteGenerator.h"

#if !defined(CMAKE_BOOT_MINGW)
#include "cmExtraCodeBlocksGenerator.h"
#endif
#include "cmExtraKateGenerator.h"
#include "cmExtraSublimeTextGenerator.h"

#ifdef CMAKE_USE_KDEVELOP
#include "cmGlobalKdevelopGenerator.h"
#endif

#ifdef CMAKE_USE_ECLIPSE
#include "cmExtraEclipseCDT4Generator.h"
#endif

#if defined(__APPLE__)
#if defined(CMAKE_BUILD_WITH_CMAKE)
#include "cmGlobalXCodeGenerator.h"

#define CMAKE_USE_XCODE 1
#endif
#include <sys/resource.h>
#include <sys/time.h>
#endif

#include <sys/types.h>
// include sys/stat.h after sys/types.h
#include <sys/stat.h> // struct stat

#include <algorithm>
#include <cmsys/FStream.hxx>
#include <cmsys/Glob.hxx>
#include <cmsys/RegularExpression.hxx>
#include <iostream>
#include <sstream>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <utility>

class cmCommand;

namespace {

#if defined(CMAKE_BUILD_WITH_CMAKE)
#ifdef CMake_HAVE_CXX_UNORDERED_MAP
typedef std::unordered_map<std::string, Json::Value> JsonValueMapType;
#else
typedef cmsys::hash_map<std::string, Json::Value> JsonValueMapType;
#endif
#endif

} // namespace

static bool cmakeCheckStampFile(const char* stampName);
static bool cmakeCheckStampList(const char* stampName);

void cmWarnUnusedCliWarning(const std::string& variable, int /*unused*/,
                            void* ctx, const char* /*unused*/,
                            const cmMakefile* /*unused*/)
{
  cmake* cm = reinterpret_cast<cmake*>(ctx);
  cm->MarkCliAsUsed(variable);
}

cmake::cmake()
{
  this->Trace = false;
  this->TraceExpand = false;
  this->WarnUninitialized = false;
  this->WarnUnused = false;
  this->WarnUnusedCli = true;
  this->CheckSystemVars = false;
  this->DebugOutput = false;
  this->DebugTryCompile = false;
  this->ClearBuildSystem = false;
  this->FileComparison = new cmFileTimeComparison;

  this->State = new cmState;
  this->CurrentSnapshot = this->State->CreateBaseSnapshot();
  this->Messenger = new cmMessenger(this->State);

#ifdef __APPLE__
  struct rlimit rlp;
  if (!getrlimit(RLIMIT_STACK, &rlp)) {
    if (rlp.rlim_cur != rlp.rlim_max) {
      rlp.rlim_cur = rlp.rlim_max;
      setrlimit(RLIMIT_STACK, &rlp);
    }
  }
#endif

  this->GlobalGenerator = CM_NULLPTR;
  this->ProgressCallback = CM_NULLPTR;
  this->ProgressCallbackClientData = CM_NULLPTR;
  this->CurrentWorkingMode = NORMAL_MODE;

#ifdef CMAKE_BUILD_WITH_CMAKE
  this->VariableWatch = new cmVariableWatch;
#endif

  this->AddDefaultGenerators();
  this->AddDefaultExtraGenerators();
  this->AddDefaultCommands();

  // Make sure we can capture the build tool output.
  cmSystemTools::EnableVSConsoleOutput();

  // Set up a list of source and header extensions
  // these are used to find files when the extension
  // is not given
  // The "c" extension MUST precede the "C" extension.
  this->SourceFileExtensions.push_back("c");
  this->SourceFileExtensions.push_back("C");

  this->SourceFileExtensions.push_back("c++");
  this->SourceFileExtensions.push_back("cc");
  this->SourceFileExtensions.push_back("cpp");
  this->SourceFileExtensions.push_back("cxx");
  this->SourceFileExtensions.push_back("m");
  this->SourceFileExtensions.push_back("M");
  this->SourceFileExtensions.push_back("mm");

  this->HeaderFileExtensions.push_back("h");
  this->HeaderFileExtensions.push_back("hh");
  this->HeaderFileExtensions.push_back("h++");
  this->HeaderFileExtensions.push_back("hm");
  this->HeaderFileExtensions.push_back("hpp");
  this->HeaderFileExtensions.push_back("hxx");
  this->HeaderFileExtensions.push_back("in");
  this->HeaderFileExtensions.push_back("txx");
}

cmake::~cmake()
{
  delete this->State;
  delete this->Messenger;
  if (this->GlobalGenerator) {
    delete this->GlobalGenerator;
    this->GlobalGenerator = CM_NULLPTR;
  }
  cmDeleteAll(this->Generators);
#ifdef CMAKE_BUILD_WITH_CMAKE
  delete this->VariableWatch;
#endif
  delete this->FileComparison;
}

#if defined(CMAKE_BUILD_WITH_CMAKE)
Json::Value cmake::ReportCapabilitiesJson(bool haveServerMode) const
{
  Json::Value obj = Json::objectValue;
  // Version information:
  Json::Value version = Json::objectValue;
  version["string"] = CMake_VERSION;
  version["major"] = CMake_VERSION_MAJOR;
  version["minor"] = CMake_VERSION_MINOR;
  version["suffix"] = CMake_VERSION_SUFFIX;
  version["isDirty"] = (CMake_VERSION_IS_DIRTY == 1);
  version["patch"] = CMake_VERSION_PATCH;

  obj["version"] = version;

  // Generators:
  std::vector<cmake::GeneratorInfo> generatorInfoList;
  this->GetRegisteredGenerators(generatorInfoList);

  JsonValueMapType generatorMap;
  for (std::vector<cmake::GeneratorInfo>::const_iterator i =
         generatorInfoList.begin();
       i != generatorInfoList.end(); ++i) {
    if (i->isAlias) { // skip aliases, they are there for compatibility reasons
                      // only
      continue;
    }

    if (i->extraName.empty()) {
      Json::Value gen = Json::objectValue;
      gen["name"] = i->name;
      gen["toolsetSupport"] = i->supportsToolset;
      gen["platformSupport"] = i->supportsPlatform;
      gen["extraGenerators"] = Json::arrayValue;
      generatorMap[i->name] = gen;
    } else {
      Json::Value& gen = generatorMap[i->baseName];
      gen["extraGenerators"].append(i->extraName);
    }
  }

  Json::Value generators = Json::arrayValue;
  for (JsonValueMapType::const_iterator i = generatorMap.begin();
       i != generatorMap.end(); ++i) {
    generators.append(i->second);
  }
  obj["generators"] = generators;
  obj["serverMode"] = haveServerMode;

  return obj;
}
#endif

std::string cmake::ReportCapabilities(bool haveServerMode) const
{
  std::string result;
#if defined(CMAKE_BUILD_WITH_CMAKE)
  Json::FastWriter writer;
  result = writer.write(this->ReportCapabilitiesJson(haveServerMode));
#else
  result = "Not supported";
#endif
  return result;
}

void cmake::CleanupCommandsAndMacros()
{
  this->CurrentSnapshot = this->State->Reset();
  this->State->RemoveUserDefinedCommands();
  this->CurrentSnapshot.SetDefaultDefinitions();
}

// Parse the args
bool cmake::SetCacheArgs(const std::vector<std::string>& args)
{
  bool findPackageMode = false;
  for (unsigned int i = 1; i < args.size(); ++i) {
    std::string arg = args[i];
    if (arg.find("-D", 0) == 0) {
      std::string entry = arg.substr(2);
      if (entry.empty()) {
        ++i;
        if (i < args.size()) {
          entry = args[i];
        } else {
          cmSystemTools::Error("-D must be followed with VAR=VALUE.");
          return false;
        }
      }
      std::string var, value;
      cmState::CacheEntryType type = cmState::UNINITIALIZED;
      if (cmState::ParseCacheEntry(entry, var, value, type)) {
        // The value is transformed if it is a filepath for example, so
        // we can't compare whether the value is already in the cache until
        // after we call AddCacheEntry.
        bool haveValue = false;
        std::string cachedValue;
        if (this->WarnUnusedCli) {
          if (const char* v = this->State->GetInitializedCacheValue(var)) {
            haveValue = true;
            cachedValue = v;
          }
        }

        this->AddCacheEntry(var, value.c_str(),
                            "No help, variable specified on the command line.",
                            type);

        if (this->WarnUnusedCli) {
          if (!haveValue ||
              cachedValue != this->State->GetInitializedCacheValue(var)) {
            this->WatchUnusedCli(var);
          }
        }
      } else {
        std::cerr << "Parse error in command line argument: " << arg << "\n"
                  << "Should be: VAR:type=value\n";
        cmSystemTools::Error("No cmake script provided.");
        return false;
      }
    } else if (cmHasLiteralPrefix(arg, "-W")) {
      std::string entry = arg.substr(2);
      if (entry.empty()) {
        ++i;
        if (i < args.size()) {
          entry = args[i];
        } else {
          cmSystemTools::Error("-W must be followed with [no-]<name>.");
          return false;
        }
      }

      std::string name;
      bool foundNo = false;
      bool foundError = false;
      unsigned int nameStartPosition = 0;

      if (entry.find("no-", nameStartPosition) == 0) {
        foundNo = true;
        nameStartPosition += 3;
      }

      if (entry.find("error=", nameStartPosition) == 0) {
        foundError = true;
        nameStartPosition += 6;
      }

      name = entry.substr(nameStartPosition);
      if (name.empty()) {
        cmSystemTools::Error("No warning name provided.");
        return false;
      }

      if (!foundNo && !foundError) {
        // -W<name>
        this->DiagLevels[name] = std::max(this->DiagLevels[name], DIAG_WARN);
      } else if (foundNo && !foundError) {
        // -Wno<name>
        this->DiagLevels[name] = DIAG_IGNORE;
      } else if (!foundNo && foundError) {
        // -Werror=<name>
        this->DiagLevels[name] = DIAG_ERROR;
      } else {
        // -Wno-error=<name>
        this->DiagLevels[name] = std::min(this->DiagLevels[name], DIAG_WARN);
      }
    } else if (arg.find("-U", 0) == 0) {
      std::string entryPattern = arg.substr(2);
      if (entryPattern.empty()) {
        ++i;
        if (i < args.size()) {
          entryPattern = args[i];
        } else {
          cmSystemTools::Error("-U must be followed with VAR.");
          return false;
        }
      }
      cmsys::RegularExpression regex(
        cmsys::Glob::PatternToRegex(entryPattern, true, true).c_str());
      // go through all cache entries and collect the vars which will be
      // removed
      std::vector<std::string> entriesToDelete;
      std::vector<std::string> cacheKeys = this->State->GetCacheEntryKeys();
      for (std::vector<std::string>::const_iterator it = cacheKeys.begin();
           it != cacheKeys.end(); ++it) {
        cmState::CacheEntryType t = this->State->GetCacheEntryType(*it);
        if (t != cmState::STATIC) {
          if (regex.find(it->c_str())) {
            entriesToDelete.push_back(*it);
          }
        }
      }

      // now remove them from the cache
      for (std::vector<std::string>::const_iterator currentEntry =
             entriesToDelete.begin();
           currentEntry != entriesToDelete.end(); ++currentEntry) {
        this->State->RemoveCacheEntry(*currentEntry);
      }
    } else if (arg.find("-C", 0) == 0) {
      std::string path = arg.substr(2);
      if (path.empty()) {
        ++i;
        if (i < args.size()) {
          path = args[i];
        } else {
          cmSystemTools::Error("-C must be followed by a file name.");
          return false;
        }
      }
      std::cout << "loading initial cache file " << path << "\n";
      this->ReadListFile(args, path.c_str());
    } else if (arg.find("-P", 0) == 0) {
      i++;
      if (i >= args.size()) {
        cmSystemTools::Error("-P must be followed by a file name.");
        return false;
      }
      std::string path = args[i];
      if (path.empty()) {
        cmSystemTools::Error("No cmake script provided.");
        return false;
      }
      this->ReadListFile(args, path.c_str());
    } else if (arg.find("--find-package", 0) == 0) {
      findPackageMode = true;
    }
  }

  if (findPackageMode) {
    return this->FindPackage(args);
  }

  return true;
}

void cmake::ReadListFile(const std::vector<std::string>& args,
                         const char* path)
{
  // if a generator was not yet created, temporarily create one
  cmGlobalGenerator* gg = this->GetGlobalGenerator();
  bool created = false;

  // if a generator was not specified use a generic one
  if (!gg) {
    gg = new cmGlobalGenerator(this);
    created = true;
  }

  // read in the list file to fill the cache
  if (path) {
    this->CurrentSnapshot = this->State->Reset();
    std::string homeDir = this->GetHomeDirectory();
    std::string homeOutputDir = this->GetHomeOutputDirectory();
    this->SetHomeDirectory(cmSystemTools::GetCurrentWorkingDirectory());
    this->SetHomeOutputDirectory(cmSystemTools::GetCurrentWorkingDirectory());
    cmState::Snapshot snapshot = this->GetCurrentSnapshot();
    snapshot.GetDirectory().SetCurrentBinary(
      cmSystemTools::GetCurrentWorkingDirectory());
    snapshot.GetDirectory().SetCurrentSource(
      cmSystemTools::GetCurrentWorkingDirectory());
    snapshot.SetDefaultDefinitions();
    CM_AUTO_PTR<cmMakefile> mf(new cmMakefile(gg, snapshot));
    if (this->GetWorkingMode() != NORMAL_MODE) {
      std::string file(cmSystemTools::CollapseFullPath(path));
      cmSystemTools::ConvertToUnixSlashes(file);
      mf->SetScriptModeFile(file.c_str());

      mf->SetArgcArgv(args);
    }
    if (!mf->ReadListFile(path)) {
      cmSystemTools::Error("Error processing file: ", path);
    }
    this->SetHomeDirectory(homeDir);
    this->SetHomeOutputDirectory(homeOutputDir);
  }

  // free generic one if generated
  if (created) {
    delete gg;
  }
}

bool cmake::FindPackage(const std::vector<std::string>& args)
{
  this->SetHomeDirectory(cmSystemTools::GetCurrentWorkingDirectory());
  this->SetHomeOutputDirectory(cmSystemTools::GetCurrentWorkingDirectory());

  // if a generator was not yet created, temporarily create one
  cmGlobalGenerator* gg = new cmGlobalGenerator(this);
  this->SetGlobalGenerator(gg);

  cmState::Snapshot snapshot = this->GetCurrentSnapshot();
  snapshot.GetDirectory().SetCurrentBinary(
    cmSystemTools::GetCurrentWorkingDirectory());
  snapshot.GetDirectory().SetCurrentSource(
    cmSystemTools::GetCurrentWorkingDirectory());
  // read in the list file to fill the cache
  snapshot.SetDefaultDefinitions();
  cmMakefile* mf = new cmMakefile(gg, snapshot);
  gg->AddMakefile(mf);

  mf->SetArgcArgv(args);

  std::string systemFile = mf->GetModulesFile("CMakeFindPackageMode.cmake");
  mf->ReadListFile(systemFile.c_str());

  std::string language = mf->GetSafeDefinition("LANGUAGE");
  std::string mode = mf->GetSafeDefinition("MODE");
  std::string packageName = mf->GetSafeDefinition("NAME");
  bool packageFound = mf->IsOn("PACKAGE_FOUND");
  bool quiet = mf->IsOn("PACKAGE_QUIET");

  if (!packageFound) {
    if (!quiet) {
      printf("%s not found.\n", packageName.c_str());
    }
  } else if (mode == "EXIST") {
    if (!quiet) {
      printf("%s found.\n", packageName.c_str());
    }
  } else if (mode == "COMPILE") {
    std::string includes = mf->GetSafeDefinition("PACKAGE_INCLUDE_DIRS");
    std::vector<std::string> includeDirs;
    cmSystemTools::ExpandListArgument(includes, includeDirs);

    gg->CreateGenerationObjects();
    cmLocalGenerator* lg = gg->LocalGenerators[0];
    std::string includeFlags =
      lg->GetIncludeFlags(includeDirs, CM_NULLPTR, language);

    std::string definitions = mf->GetSafeDefinition("PACKAGE_DEFINITIONS");
    printf("%s %s\n", includeFlags.c_str(), definitions.c_str());
  } else if (mode == "LINK") {
    const char* targetName = "dummy";
    std::vector<std::string> srcs;
    cmTarget* tgt = mf->AddExecutable(targetName, srcs, true);
    tgt->SetProperty("LINKER_LANGUAGE", language.c_str());

    std::string libs = mf->GetSafeDefinition("PACKAGE_LIBRARIES");
    std::vector<std::string> libList;
    cmSystemTools::ExpandListArgument(libs, libList);
    for (std::vector<std::string>::const_iterator libIt = libList.begin();
         libIt != libList.end(); ++libIt) {
      mf->AddLinkLibraryForTarget(targetName, *libIt, GENERAL_LibraryType);
    }

    std::string buildType = mf->GetSafeDefinition("CMAKE_BUILD_TYPE");
    buildType = cmSystemTools::UpperCase(buildType);

    std::string linkLibs;
    std::string frameworkPath;
    std::string linkPath;
    std::string flags;
    std::string linkFlags;
    gg->CreateGenerationObjects();
    cmGeneratorTarget* gtgt = gg->FindGeneratorTarget(tgt->GetName());
    cmLocalGenerator* lg = gtgt->GetLocalGenerator();
    lg->GetTargetFlags(buildType, linkLibs, flags, linkFlags, frameworkPath,
                       linkPath, gtgt, false);
    linkLibs = frameworkPath + linkPath + linkLibs;

    printf("%s\n", linkLibs.c_str());

    /*    if ( use_win32 )
          {
          tgt->SetProperty("WIN32_EXECUTABLE", "ON");
          }
        if ( use_macbundle)
          {
          tgt->SetProperty("MACOSX_BUNDLE", "ON");
          }*/
  }

  // free generic one if generated
  //  this->SetGlobalGenerator(0); // setting 0-pointer is not possible
  //  delete gg; // this crashes inside the cmake instance

  return packageFound;
}

// Parse the args
void cmake::SetArgs(const std::vector<std::string>& args,
                    bool directoriesSetBefore)
{
  bool directoriesSet = directoriesSetBefore;
  bool haveToolset = false;
  bool havePlatform = false;
  for (unsigned int i = 1; i < args.size(); ++i) {
    std::string arg = args[i];
    if (arg.find("-H", 0) == 0) {
      directoriesSet = true;
      std::string path = arg.substr(2);
      path = cmSystemTools::CollapseFullPath(path);
      cmSystemTools::ConvertToUnixSlashes(path);
      this->SetHomeDirectory(path);
    } else if (arg.find("-S", 0) == 0) {
      // There is no local generate anymore.  Ignore -S option.
    } else if (arg.find("-O", 0) == 0) {
      // There is no local generate anymore.  Ignore -O option.
    } else if (arg.find("-B", 0) == 0) {
      directoriesSet = true;
      std::string path = arg.substr(2);
      path = cmSystemTools::CollapseFullPath(path);
      cmSystemTools::ConvertToUnixSlashes(path);
      this->SetHomeOutputDirectory(path);
    } else if ((i < args.size() - 2) &&
               (arg.find("--check-build-system", 0) == 0)) {
      this->CheckBuildSystemArgument = args[++i];
      this->ClearBuildSystem = (atoi(args[++i].c_str()) > 0);
    } else if ((i < args.size() - 1) &&
               (arg.find("--check-stamp-file", 0) == 0)) {
      this->CheckStampFile = args[++i];
    } else if ((i < args.size() - 1) &&
               (arg.find("--check-stamp-list", 0) == 0)) {
      this->CheckStampList = args[++i];
    }
#if defined(CMAKE_HAVE_VS_GENERATORS)
    else if ((i < args.size() - 1) &&
             (arg.find("--vs-solution-file", 0) == 0)) {
      this->VSSolutionFile = args[++i];
    }
#endif
    else if (arg.find("-D", 0) == 0) {
      // skip for now
    } else if (arg.find("-U", 0) == 0) {
      // skip for now
    } else if (arg.find("-C", 0) == 0) {
      // skip for now
    } else if (arg.find("-P", 0) == 0) {
      // skip for now
      i++;
    } else if (arg.find("--find-package", 0) == 0) {
      // skip for now
      i++;
    } else if (arg.find("-W", 0) == 0) {
      // skip for now
    } else if (arg.find("--graphviz=", 0) == 0) {
      std::string path = arg.substr(strlen("--graphviz="));
      path = cmSystemTools::CollapseFullPath(path);
      cmSystemTools::ConvertToUnixSlashes(path);
      this->GraphVizFile = path;
      if (this->GraphVizFile.empty()) {
        cmSystemTools::Error("No file specified for --graphviz");
      }
    } else if (arg.find("--debug-trycompile", 0) == 0) {
      std::cout << "debug trycompile on\n";
      this->DebugTryCompileOn();
    } else if (arg.find("--debug-output", 0) == 0) {
      std::cout << "Running with debug output on.\n";
      this->SetDebugOutputOn(true);
    } else if (arg.find("--trace-expand", 0) == 0) {
      std::cout << "Running with expanded trace output on.\n";
      this->SetTrace(true);
      this->SetTraceExpand(true);
    } else if (arg.find("--trace-source=", 0) == 0) {
      std::string file = arg.substr(strlen("--trace-source="));
      cmSystemTools::ConvertToUnixSlashes(file);
      this->AddTraceSource(file);
      this->SetTrace(true);
    } else if (arg.find("--trace", 0) == 0) {
      std::cout << "Running with trace output on.\n";
      this->SetTrace(true);
      this->SetTraceExpand(false);
    } else if (arg.find("--warn-uninitialized", 0) == 0) {
      std::cout << "Warn about uninitialized values.\n";
      this->SetWarnUninitialized(true);
    } else if (arg.find("--warn-unused-vars", 0) == 0) {
      std::cout << "Finding unused variables.\n";
      this->SetWarnUnused(true);
    } else if (arg.find("--no-warn-unused-cli", 0) == 0) {
      std::cout << "Not searching for unused variables given on the "
                << "command line.\n";
      this->SetWarnUnusedCli(false);
    } else if (arg.find("--check-system-vars", 0) == 0) {
      std::cout << "Also check system files when warning about unused and "
                << "uninitialized variables.\n";
      this->SetCheckSystemVars(true);
    } else if (arg.find("-A", 0) == 0) {
      std::string value = arg.substr(2);
      if (value.empty()) {
        ++i;
        if (i >= args.size()) {
          cmSystemTools::Error("No platform specified for -A");
          return;
        }
        value = args[i];
      }
      if (havePlatform) {
        cmSystemTools::Error("Multiple -A options not allowed");
        return;
      }
      this->GeneratorPlatform = value;
      havePlatform = true;
    } else if (arg.find("-T", 0) == 0) {
      std::string value = arg.substr(2);
      if (value.empty()) {
        ++i;
        if (i >= args.size()) {
          cmSystemTools::Error("No toolset specified for -T");
          return;
        }
        value = args[i];
      }
      if (haveToolset) {
        cmSystemTools::Error("Multiple -T options not allowed");
        return;
      }
      this->GeneratorToolset = value;
      haveToolset = true;
    } else if (arg.find("-G", 0) == 0) {
      std::string value = arg.substr(2);
      if (value.empty()) {
        ++i;
        if (i >= args.size()) {
          cmSystemTools::Error("No generator specified for -G");
          this->PrintGeneratorList();
          return;
        }
        value = args[i];
      }
      cmGlobalGenerator* gen = this->CreateGlobalGenerator(value);
      if (!gen) {
        cmSystemTools::Error("Could not create named generator ",
                             value.c_str());
        this->PrintGeneratorList();
      } else {
        this->SetGlobalGenerator(gen);
      }
    }
    // no option assume it is the path to the source
    else {
      directoriesSet = true;
      this->SetDirectoriesFromFile(arg.c_str());
    }
  }
  if (!directoriesSet) {
    this->SetHomeOutputDirectory(cmSystemTools::GetCurrentWorkingDirectory());
    this->SetHomeDirectory(cmSystemTools::GetCurrentWorkingDirectory());
  }
}

void cmake::SetDirectoriesFromFile(const char* arg)
{
  // Check if the argument refers to a CMakeCache.txt or
  // CMakeLists.txt file.
  std::string listPath;
  std::string cachePath;
  bool argIsFile = false;
  if (cmSystemTools::FileIsDirectory(arg)) {
    std::string path = cmSystemTools::CollapseFullPath(arg);
    cmSystemTools::ConvertToUnixSlashes(path);
    std::string cacheFile = path;
    cacheFile += "/CMakeCache.txt";
    std::string listFile = path;
    listFile += "/CMakeLists.txt";
    if (cmSystemTools::FileExists(cacheFile.c_str())) {
      cachePath = path;
    }
    if (cmSystemTools::FileExists(listFile.c_str())) {
      listPath = path;
    }
  } else if (cmSystemTools::FileExists(arg)) {
    argIsFile = true;
    std::string fullPath = cmSystemTools::CollapseFullPath(arg);
    std::string name = cmSystemTools::GetFilenameName(fullPath);
    name = cmSystemTools::LowerCase(name);