/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
   file LICENSE.rst or https://cmake.org/licensing for details.  */
#include "cmGlobalUnixMakefileGenerator3.h"

#include <algorithm>
#include <functional>
#include <sstream>
#include <utility>

#include <cm/memory>
#include <cmext/algorithm>
#include <cmext/memory>

#include "cmsys/RegularExpression.hxx"

#include "cmDuration.h"
#include "cmGeneratedFileStream.h"
#include "cmGeneratorTarget.h"
#include "cmGlobalGenerator.h"
#include "cmLocalGenerator.h"
#include "cmLocalUnixMakefileGenerator3.h"
#include "cmMakefile.h"
#include "cmMakefileTargetGenerator.h"
#include "cmMessageType.h"
#include "cmOutputConverter.h"
#include "cmState.h"
#include "cmStringAlgorithms.h"
#include "cmSystemTools.h"
#include "cmTarget.h"
#include "cmTargetDepend.h"
#include "cmTargetTypes.h"
#include "cmTest.h"
#include "cmTestGenerator.h"
#include "cmValue.h"
#include "cmake.h"

cmGlobalUnixMakefileGenerator3::cmGlobalUnixMakefileGenerator3(cmake* cm)
  : cmGlobalCommonGenerator(cm)
{
  // This type of makefile always requires unix style paths
  this->ForceUnixPaths = true;
  this->FindMakeProgramFile = "CMakeUnixFindMake.cmake";
  this->ToolSupportsColor = true;

#if defined(_WIN32) || defined(__VMS)
  this->UseLinkScript = false;
#else
  this->UseLinkScript = true;
#endif

  this->IncludeDirective = "include";
  this->LineContinueDirective = "\\\n";
  this->DefineWindowsNULL = false;
  this->PassMakeflags = false;
  this->UnixCD = true;
}

cmGlobalUnixMakefileGenerator3::~cmGlobalUnixMakefileGenerator3() = default;

void cmGlobalUnixMakefileGenerator3::EnableLanguage(
  std::vector<std::string> const& languages, cmMakefile* mf, bool optional)
{
  this->cmGlobalGenerator::EnableLanguage(languages, mf, optional);
  for (std::string const& language : languages) {
    if (language == "NONE") {
      continue;
    }
    this->ResolveLanguageCompiler(language, mf, optional);
  }
}

//! Create a local generator appropriate to this Global Generator
std::unique_ptr<cmLocalGenerator>
cmGlobalUnixMakefileGenerator3::CreateLocalGenerator(cmMakefile* mf)
{
  return std::unique_ptr<cmLocalGenerator>(
    cm::make_unique<cmLocalUnixMakefileGenerator3>(this, mf));
}

cmDocumentationEntry cmGlobalUnixMakefileGenerator3::GetDocumentation()
{
  return { cmGlobalUnixMakefileGenerator3::GetActualName(),
           "Generates standard UNIX makefiles." };
}

bool cmGlobalUnixMakefileGenerator3::SupportsShortObjectNames() const
{
  return true;
}

void cmGlobalUnixMakefileGenerator3::ComputeTargetObjectDirectory(
  cmGeneratorTarget* gt) const
{
  // Compute full path to object file directory for this target.
  std::string dir = cmStrCat(gt->GetSupportDirectory(), '/');
  gt->ObjectDirectory = dir;
}

bool cmGlobalUnixMakefileGenerator3::IsInstallPrepComponentRepresentable(
  std::string const& component) const
{
  // A Makefile rule name cannot contain ':'.
  return component.find(':') == std::string::npos &&
    this->cmGlobalGenerator::IsInstallPrepComponentRepresentable(component);
}

bool cmGlobalUnixMakefileGenerator3::CanEscapeOctothorpe() const
{
  // Make tools that use UNIX-style '/' paths also support '\' escaping.
  return this->ForceUnixPaths;
}

void cmGlobalUnixMakefileGenerator3::Configure()
{
  // Initialize CMAKE_EDIT_COMMAND cache entry.
  this->GetEditCacheCommand();

  this->cmGlobalGenerator::Configure();
}

void cmGlobalUnixMakefileGenerator3::Generate()
{
  this->ClangTidyExportFixesDirs.clear();
  this->ClangTidyExportFixesFiles.clear();

  this->TestPrepTargets.clear();
  this->TestPrepEnabled = false;

  // Compute the "test_prep/" and "install_prep/" targets before generating the
  // local makefiles so they can be emitted in a single pass.
  this->ComputeTestPrepTargets();
  this->ComputeInstallPrepTargets();

  // first do superclass method
  this->cmGlobalGenerator::Generate();

  // initialize progress
  unsigned long total = 0;
  for (auto const& pmi : this->ProgressMap) {
    total += pmi.second.NumberOfActions;
  }

  // write each target's progress.make this loop is done twice. Basically the
  // Generate pass counts all the actions, the first loop below determines
  // how many actions have progress updates for each target and writes to
  // correct variable values for everything except the all targets. The
  // second loop actually writes out correct values for the all targets as
  // well. This is because the all targets require more information that is
  // computed in the first loop.
  unsigned long current = 0;
  for (auto& pmi : this->ProgressMap) {
    pmi.second.WriteProgressVariables(total, current);
  }
  for (auto const& lg : this->LocalGenerators) {
    std::string markFileName =
      cmStrCat(lg->GetCurrentBinaryDirectory(), "/CMakeFiles/progress.marks");
    cmGeneratedFileStream markFile(markFileName);
    markFile << this->CountProgressMarksInAll(*lg) << "\n";
  }

  // write the main makefile
  this->WriteMainMakefile2();
  this->WriteMainCMakefile();

  if (this->CommandDatabase) {
    *this->CommandDatabase << "\n]";
    this->CommandDatabase.reset();
  }

  this->RemoveUnknownClangTidyExportFixesFiles();
}

void cmGlobalUnixMakefileGenerator3::AddCXXCompileCommand(
  std::string const& sourceFile, std::string const& workingDirectory,
  std::string const& compileCommand, std::string const& objPath)
{
  if (!this->CommandDatabase) {
    std::string commandDatabaseName =
      this->GetCMakeInstance()->GetHomeOutputDirectory() +
      "/compile_commands.json";
    this->CommandDatabase =
      cm::make_unique<cmGeneratedFileStream>(commandDatabaseName);
    *this->CommandDatabase << "[\n";
  } else {
    *this->CommandDatabase << ",\n";
  }
  *this->CommandDatabase << "{\n"
                         << R"(  "directory": ")"
                         << cmGlobalGenerator::EscapeJSON(workingDirectory)
                         << "\",\n"
                         << R"(  "command": ")"
                         << cmGlobalGenerator::EscapeJSON(compileCommand)
                         << "\",\n"
                         << R"(  "file": ")"
                         << cmGlobalGenerator::EscapeJSON(sourceFile)
                         << "\",\n"
                         << R"(  "output": ")"
                         << cmGlobalGenerator::EscapeJSON(objPath) << "\"\n}";
}

void cmGlobalUnixMakefileGenerator3::WriteMainMakefile2()
{
  // 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 =
    cmStrCat(this->GetCMakeInstance()->GetHomeOutputDirectory(),
             "/CMakeFiles/Makefile2");
  cmGeneratedFileStream makefileStream(makefileName, false,
                                       this->GetMakefileEncoding());
  if (!makefileStream) {
    return;
  }

  // The global dependency graph is expressed via the root local generator.
  auto& rootLG = cm::static_reference_cast<cmLocalUnixMakefileGenerator3>(
    this->LocalGenerators[0]);

  // Write the do not edit header.
  rootLG.WriteDisclaimer(makefileStream);

  // 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.emplace_back("all");

  // Write the rule.
  rootLG.WriteMakeRule(makefileStream,
                       "Default target executed when no arguments are "
                       "given to make.",
                       "default_target", depends, no_commands, true);

  depends.clear();

  // The all and preinstall rules might never have any dependencies
  // added to them.
  if (!this->EmptyRuleHackDepends.empty()) {
    depends.push_back(this->EmptyRuleHackDepends);
  }

  // Write out the "special" stuff
  rootLG.WriteSpecialTargetsTop(makefileStream);

  // Write the directory level rules.
  for (auto const& it : this->ComputeDirectoryTargets()) {
    this->WriteDirectoryRules2(makefileStream, rootLG, it.second);
  }

  // Write the target convenience rules
  for (auto const& localGen : this->LocalGenerators) {
    this->WriteConvenienceRules2(
      makefileStream, rootLG,
      cm::static_reference_cast<cmLocalUnixMakefileGenerator3>(localGen));
  }

  // Write the internal test_prep/ and install_prep/ rules.
  this->WriteTestPrepRules(makefileStream, rootLG);
  this->WriteInstallPrepRules(makefileStream, rootLG);

  // Write special bottom targets
  rootLG.WriteSpecialTargetsBottom(makefileStream);
}

void cmGlobalUnixMakefileGenerator3::WriteMainCMakefile()
{
  if (this->GlobalSettingIsOn("CMAKE_SUPPRESS_REGENERATION")) {
    return;
  }

  // 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 cmakefileName =
    cmStrCat(this->GetCMakeInstance()->GetHomeOutputDirectory(),
             "/CMakeFiles/Makefile.cmake");
  cmGeneratedFileStream cmakefileStream(cmakefileName);
  if (!cmakefileStream) {
    return;
  }

  std::string makefileName =
    cmStrCat(this->GetCMakeInstance()->GetHomeOutputDirectory(), "/Makefile");

  {
    // get a local generator for some useful methods
    auto& lg = cm::static_reference_cast<cmLocalUnixMakefileGenerator3>(
      this->LocalGenerators[0]);

    // Write the do not edit header.
    lg.WriteDisclaimer(cmakefileStream);
  }

  // Save the generator name
  cmakefileStream << "# The generator used is:\n"
                  << "set(CMAKE_DEPENDS_GENERATOR \"" << this->GetName()
                  << "\")\n\n";

  // for each cmMakefile get its list of dependencies
  std::vector<std::string> lfiles;
  for (auto const& localGen : this->LocalGenerators) {
    // Get the list of files contributing to this generation step.
    cm::append(lfiles, localGen->GetMakefile()->GetListFiles());
  }

  cmake* cm = this->GetCMakeInstance();
  if (cm->DoWriteGlobVerifyTarget()) {
    lfiles.push_back(cm->GetGlobVerifyScript());
    lfiles.push_back(cm->GetGlobVerifyStamp());
  }

  // Sort the list and remove duplicates.
  std::sort(lfiles.begin(), lfiles.end(), std::less<std::string>());
#if !defined(__VMS) // The Compaq STL on VMS crashes, so accept duplicates.
  auto new_end = std::unique(lfiles.begin(), lfiles.end());
  lfiles.erase(new_end, lfiles.end());
#endif

  {
    // reset lg to the first makefile
    auto const& lg = cm::static_reference_cast<cmLocalUnixMakefileGenerator3>(
      this->LocalGenerators[0]);

    // Save the list to the cmake file.
    cmakefileStream
      << "# The top level Makefile was generated from the following files:\n"
      << "set(CMAKE_MAKEFILE_DEPENDS\n"
      << "  \"CMakeCache.txt\"\n";
    for (std::string const& f : lfiles) {
      cmakefileStream << "  \"" << lg.MaybeRelativeToCurBinDir(f) << "\"\n";
    }
    cmakefileStream << "  )\n\n";

    // Build the path to the cache check file.
    std::string check =
      cmStrCat(this->GetCMakeInstance()->GetHomeOutputDirectory(),
               "/CMakeFiles/cmake.check_cache");

    // Set the corresponding makefile in the cmake file.
    cmakefileStream << "# The corresponding makefile is:\n"
                    << "set(CMAKE_MAKEFILE_OUTPUTS\n"
                    << "  \"" << lg.MaybeRelativeToCurBinDir(makefileName)
                    << "\"\n"
                    << "  \"" << lg.MaybeRelativeToCurBinDir(check) << "\"\n";
    cmakefileStream << "  )\n\n";

    // CMake must rerun if a byproduct is missing.
    cmakefileStream << "# Byproducts of CMake generate step:\n"
                    << "set(CMAKE_MAKEFILE_PRODUCTS\n";

    // add in any byproducts and all the directory information files
    std::string tmpStr;
    for (auto const& localGen : this->LocalGenerators) {
      for (std::string const& outfile :
           localGen->GetMakefile()->GetOutputFiles()) {
        cmakefileStream << "  \"" << lg.MaybeRelativeToTopBinDir(outfile)
                        << "\"\n";
      }
      tmpStr = cmStrCat(localGen->GetCurrentBinaryDirectory(),
                        "/CMakeFiles/CMakeDirectoryInformation.cmake");
      cmakefileStream << "  \"" << localGen->MaybeRelativeToTopBinDir(tmpStr)
                      << "\"\n";
    }
    cmakefileStream << "  )\n\n";
  }

  this->WriteMainCMakefileLanguageRules(cmakefileStream,
                                        this->LocalGenerators);
}

void cmGlobalUnixMakefileGenerator3::WriteMainCMakefileLanguageRules(
  cmGeneratedFileStream& cmakefileStream,
  std::vector<std::unique_ptr<cmLocalGenerator>>& lGenerators)
{
  // now list all the target info files
  cmakefileStream << "# Dependency information for all targets:\n";
  cmakefileStream << "set(CMAKE_DEPEND_INFO_FILES\n";
  for (auto const& lGenerator : lGenerators) {
    auto const& lg =
      cm::static_reference_cast<cmLocalUnixMakefileGenerator3>(lGenerator);
    // for all of out targets
    for (auto const& tgt : lg.GetGeneratorTargets()) {
      if (tgt->IsInBuildSystem() &&
          tgt->GetType() != cm::TargetType::GLOBAL_TARGET) {
        std::string tname = cmStrCat(lg.GetRelativeTargetDirectory(tgt.get()),
                                     "/DependInfo.cmake");
        cmSystemTools::ConvertToUnixSlashes(tname);
        cmakefileStream << "  \"" << tname << "\"\n";
      }
    }
  }
  cmakefileStream << "  )\n";
}

void cmGlobalUnixMakefileGenerator3::WriteDirectoryRule2(
  std::ostream& ruleFileStream, cmLocalUnixMakefileGenerator3& rootLG,
  DirectoryTarget const& dt, char const* pass, bool check_all,
  bool check_relink, std::vector<std::string> const& commands)
{
  auto* lg = static_cast<cmLocalUnixMakefileGenerator3*>(dt.LG);
  std::string makeTarget =
    cmStrCat(lg->GetCurrentBinaryDirectory(), '/', pass);

  // The directory-level rule should depend on the target-level rules
  // for all targets in the directory.
  std::vector<std::string> depends;
  for (DirectoryTarget::Target const& t : dt.Targets) {
    // Add this to the list of depends rules in this directory.
    if ((!check_all || t.ExcludedFromAllInConfigs.empty()) &&
        (!check_relink ||
         t.GT->NeedRelinkBeforeInstall(lg->GetConfigName()))) {
      // The target may be from a different directory; use its local gen.
      auto const* tlg = static_cast<cmLocalUnixMakefileGenerator3 const*>(
        t.GT->GetLocalGenerator());
      std::string tname =
        cmStrCat(tlg->GetRelativeTargetDirectory(t.GT), '/', pass);
      depends.push_back(std::move(tname));
    }
  }

  // The directory-level rule should depend on the directory-level
  // rules of the subdirectories.
  for (DirectoryTarget::Dir const& d : dt.Children) {
    if (check_all && d.ExcludeFromAll) {
      continue;
    }
    std::string subdir = cmStrCat(d.Path, '/', pass);
    depends.push_back(std::move(subdir));
  }

  // Work-around for makes that drop rules that have no dependencies
  // or commands.
  if (depends.empty() && !this->EmptyRuleHackDepends.empty()) {
    depends.push_back(this->EmptyRuleHackDepends);
  }

  // Write the rule.
  std::string doc;
  if (lg->IsRootMakefile()) {
    doc = cmStrCat("The main recursive \"", pass, "\" target.");
  } else {
    doc = cmStrCat("Recursive \"", pass, "\" directory target.");
  }

  rootLG.WriteMakeRule(ruleFileStream, doc.c_str(), makeTarget, depends,
                       commands, true);
}

void cmGlobalUnixMakefileGenerator3::WriteDirectoryRules2(
  std::ostream& ruleFileStream, cmLocalUnixMakefileGenerator3& rootLG,
  DirectoryTarget const& dt)
{
  auto* lg = static_cast<cmLocalUnixMakefileGenerator3*>(dt.LG);
  // Begin the directory-level rules section.
  {
    std::string dir = cmSystemTools::ConvertToOutputPath(
      rootLG.MaybeRelativeToTopBinDir(lg->GetCurrentBinaryDirectory()));
    rootLG.WriteDivider(ruleFileStream);
    if (lg->IsRootMakefile()) {
      ruleFileStream << "# Directory level rules for the build root directory";
    } else {
      ruleFileStream << "# Directory level rules for directory " << dir;
    }
    ruleFileStream << "\n\n";
  }

  // Write directory-level rules for "all".
  this->WriteDirectoryRule2(ruleFileStream, rootLG, dt, "all", true, false);

  // Write directory-level rules for "codegen".
  this->WriteDirectoryRule2(ruleFileStream, rootLG, dt, "codegen", true,
                            false);

  // Write directory-level rules for "preinstall".
  this->WriteDirectoryRule2(ruleFileStream, rootLG, dt, "preinstall", true,
                            true);

  // Write directory-level rules for "clean".
  {
    std::vector<std::string> cmds;
    lg->AppendDirectoryCleanCommand(cmds);
    this->WriteDirectoryRule2(ruleFileStream, rootLG, dt, "clean", false,
                              false, cmds);
  }
}

namespace {
std::string ConvertToMakefilePathForUnix(std::string const& path,
                                         bool isForceQuote)
{
  bool const quote = isForceQuote;
  std::string result;
  result.reserve(path.size() + (quote ? 2 : 0));
  if (quote) {
    result.push_back('"');
  }
  for (char c : path) {
    switch (c) {
      case '=':
        // We provide 'EQUALS = =' to encode '=' in a non-assignment case.
        result.append("$(EQUALS)");
        break;
      case '$':
        result.append("$$");
        break;
      case '\\':
      case ' ':
      case '#':
        result.push_back('\\');
        CM_FALLTHROUGH;
      default:
        result.push_back(c);
        break;
    }
  }
  if (quote) {
    result.push_back('"');
  }
  return result;
}

#if defined(_WIN32) && !defined(__CYGWIN__)
std::string ConvertToMakefilePathForWindows(std::string const& path,
                                            bool isForceQuote)
{
  bool const quote =
    isForceQuote || path.find_first_of(" #") != std::string::npos;
  std::string result;
  result.reserve(path.size() + (quote ? 2 : 0));
  if (quote) {
    result.push_back('"');
  }
  for (char c : path) {
    switch (c) {
      case '=':
        // We provide 'EQUALS = =' to encode '=' in a non-assignment case.
        result.append("$(EQUALS)");
        break;
      case '$':
        result.append("$$");
        break;
      case '/':
        result.push_back('\\');
        break;
      default:
        result.push_back(c);
        break;
    }
  }
  if (quote) {
    result.push_back('"');
  }
  return result;
}
#endif
}

std::string cmGlobalUnixMakefileGenerator3::ConvertToMakefilePath(
  std::string const& path) const
{
  // Watcom WMake treats '+' as special. Quote the whole path so names
  // containing '+' (e.g. test+1.c, stdc++.cmake) are accepted.
  bool const isWatcomWMake =
    this->GetCMakeInstance()->GetState()->UseWatcomWMake();
  bool const isForceQuote =
    isWatcomWMake && path.find('+') != std::string::npos;

#if defined(_WIN32) && !defined(__CYGWIN__)
  if (!this->ForceUnixPaths) {
    return ConvertToMakefilePathForWindows(path, isForceQuote);
  }
#endif
  return ConvertToMakefilePathForUnix(path, isForceQuote);
}

std::vector<cmGlobalGenerator::GeneratedMakeCommand>
cmGlobalUnixMakefileGenerator3::GenerateBuildCommand(
  std::string const& makeProgram, std::string const& /*projectName*/,
  std::string const& /*projectDir*/,
  std::vector<std::string> const& targetNames, std::string const& /*config*/,
  int jobs, bool verbose, cmBuildOptions buildOptions,
  std::vector<std::string> const& makeOptions,
  BuildTryCompile /*isInTryCompile*/)
{
  GeneratedMakeCommand makeCommand;

  // Make it possible to set verbosity also from command line
  if (verbose) {
    makeCommand.Add(cmSystemTools::GetCMakeCommand());
    makeCommand.Add("-E");
    makeCommand.Add("env");
    makeCommand.Add("VERBOSE=1");
  }
  makeCommand.Add(this->SelectMakeProgram(makeProgram));

  // Explicitly tell the make tool to use the Makefile written by
  // cmLocalUnixMakefileGenerator3::WriteLocalMakefile
  makeCommand.Add("-f");
  makeCommand.Add("Makefile");

  if (jobs != cmake::NO_BUILD_PARALLEL_LEVEL) {
    if (jobs == cmake::DEFAULT_BUILD_PARALLEL_LEVEL) {
      makeCommand.Add("-j");
    } else {
      makeCommand.Add(cmStrCat("-j", jobs));
    }

    // Group each recipe's output so parallel jobs do not interleave.  Only
    // done when CMake is the one passing the parallel flag to make; a native
    // `-- -j` leaves jobs unset and thus opts out.  Grouping requires GNU
    // Make 4.0+ (its --output-sync); IsGNUMakeJobServerAware() excludes
    // non-GNU makes such as JOM before the version probe runs.  Emitted
    // before the user's make options so a native `-- -O<mode>` overrides it.
    if (this->IsGNUMakeJobServerAware() &&
        this->MakeSupportsOutputSync(makeProgram)) {
      makeCommand.Add("-Otarget");
      // Set the (empty by default) USES_TERMINAL recipe prefix to "+" so
      // GNU Make leaves those recipes unbuffered, keeping interactive
      // commands able to reach the terminal under -Otarget.
      makeCommand.Add("CMAKE_USES_TERMINAL_PREFIX=+");
    }
  }

  makeCommand.Add(makeOptions.begin(), makeOptions.end());
  for (auto tname : targetNames) {
    if (!tname.empty()) {
      if (buildOptions.Fast) {
        tname += "/fast";
      }
      cmSystemTools::ConvertToOutputSlashes(tname);
      makeCommand.Add(std::move(tname));
    }
  }
  return { std::move(makeCommand) };
}

bool cmGlobalUnixMakefileGenerator3::MakeSupportsOutputSync(
  std::string const& makeProgram)
{
  if (this->OutputSyncSupportState == OutputSyncSupport::Unknown) {
    // Any probe failure (spawn error, timeout, non-GNU or old make) leaves
    // grouping off; it is a convenience and must never fail the build.
    this->OutputSyncSupportState = OutputSyncSupport::No;

    std::string version;
    std::string error;
    int retVal = 1;
    std::vector<std::string> command{ this->SelectMakeProgram(makeProgram),
                                      "--version" };
    if (cmSystemTools::RunSingleCommand(command, &version, &error, &retVal,
                                        nullptr, cmSystemTools::OUTPUT_NONE,
                                        cmDuration(30)) &&
        retVal == 0) {
      // GNU Make's version line is not localized, so no LC_ALL=C is needed.
      cmsys::RegularExpression versionRegex("GNU Make ([0-9]+(\\.[0-9]+)*)");
      if (versionRegex.find(version) &&
          !cmSystemTools::VersionCompare(cmSystemTools::OP_LESS,
                                         versionRegex.match(1), "4.0")) {
        this->OutputSyncSupportState = OutputSyncSupport::Yes;
      }
    }
  }
  return this->OutputSyncSupportState == OutputSyncSupport::Yes;
}

void cmGlobalUnixMakefileGenerator3::WriteConvenienceRules(
  std::ostream& ruleFileStream, std::set<std::string>& emitted)
{
  std::vector<std::string> depends;
  std::vector<std::string> commands;

  bool regenerate = !this->GlobalSettingIsOn("CMAKE_SUPPRESS_REGENERATION");
  if (regenerate) {
    depends.emplace_back("cmake_check_build_system");
  }

  // write the target convenience rules
  for (auto const& localGen : this->LocalGenerators) {
    auto& lg =
      cm::static_reference_cast<cmLocalUnixMakefileGenerator3>(localGen);
    // for each target Generate the rule files for each target.
    for (auto const& gtarget : lg.GetGeneratorTargets()) {
      // Don't emit the same rule twice (e.g. two targets with the same
      // simple name)
      std::string name = gtarget->GetName();
      if (!name.empty() && emitted.insert(name).second &&
          // Handle user targets here.  Global targets are handled in
          // the local generator on a per-directory basis.
          (gtarget->IsInBuildSystem() &&
           gtarget->GetType() != cm::TargetType::GLOBAL_TARGET)) {
        // Add a rule to build the target by name.
        lg.WriteDivider(ruleFileStream);
        ruleFileStream << "# Target rules for targets named " << name
                       << "\n\n";

        // Write the rule.
        commands.clear();
        std::string tmp = "CMakeFiles/Makefile2";
        commands.push_back(lg.GetRecursiveMakeCall(tmp, name));
        depends.clear();
        if (regenerate) {
          depends.emplace_back("cmake_check_build_system");
        }
        lg.WriteMakeRule(ruleFileStream, "Build rule for target.", name,
                         depends, commands, true);

        // Add a fast rule to build the target
        std::string localName = lg.GetRelativeTargetDirectory(gtarget.get());
        std::string makefileName;
        makefileName = cmStrCat(localName, "/build.make");
        depends.clear();
        commands.clear();
        std::string makeTargetName = cmStrCat(localName, "/build");
        localName = cmStrCat(name, "/fast");
        commands.push_back(
          lg.GetRecursiveMakeCall(makefileName, makeTargetName));
        lg.WriteMakeRule(ruleFileStream, "fast build rule for target.",
                         localName, depends, commands, true);

        // Add a local name for the rule to relink the target before
        // installation.
        if (gtarget->NeedRelinkBeforeInstall(lg.GetConfigName())) {
          makeTargetName = cmStrCat(
            lg.GetRelativeTargetDirectory(gtarget.get()), "/preinstall");
          localName = cmStrCat(name, "/preinstall");
          depends.clear();
          commands.clear();
          commands.push_back(
            lg.GetRecursiveMakeCall(makefileName, makeTargetName));
          lg.WriteMakeRule(ruleFileStream,
                           "Manual pre-install relink rule for target.",
                           localName, depends, commands, true);
        }
      }
    }
  }

  // Forward the test_prep/ and install_prep/ convenience targets to
  // CMakeFiles/Makefile2.
  this->WriteTestPrepConvenienceRules(ruleFileStream);
  this->WriteInstallPrepConvenienceRules(ruleFileStream);
}

void cmGlobalUnixMakefileGenerator3::WriteConvenienceRules2(
  std::ostream& ruleFileStream, cmLocalUnixMakefileGenerator3& rootLG,
  cmLocalUnixMakefileGenerator3& lg)
{
  std::vector<std::string> depends;
  std::vector<std::string> commands;
  std::string localName;
  std::string makeTargetName;

  bool regenerate = !this->GlobalSettingIsOn("CMAKE_SUPPRESS_REGENERATION");
  if (regenerate) {
    depends.emplace_back("cmake_check_build_system");
  }

  // for each target Generate the rule files for each target.
  for (auto const& gtarget : lg.GetGeneratorTargets()) {
    std::string name = gtarget->GetName();
    if (!name.empty() &&
        (gtarget->IsInBuildSystem() &&
         gtarget->GetType() != cm::TargetType::GLOBAL_TARGET)) {
      std::string makefileName;
      // Add a rule to build the target by name.
      localName = lg.GetRelativeTargetDirectory(gtarget.get());
      makefileName = cmStrCat(localName, "/build.make");

      lg.WriteDivider(ruleFileStream);
      ruleFileStream << "# Target rules for target " << localName << "\n\n";

      commands.clear();
      makeTargetName = cmStrCat(localName, "/depend");
      commands.push_back(
        lg.GetRecursiveMakeCall(makefileName, makeTargetName));

      makeTargetName = cmStrCat(localName, "/build");
      commands.push_back(
        lg.GetRecursiveMakeCall(makefileName, makeTargetName));

      // Write the rule.
      localName += "/all";
      depends.clear();

      cmLocalUnixMakefileGenerator3::EchoProgress progress;
      progress.Dir = cmStrCat(lg.GetBinaryDirectory(), "/CMakeFiles");
      {
        progress.Arg = cmJoin(this->ProgressMap[gtarget.get()].Marks, ",");
      }

      bool targetMessages = true;
      if (cmValue tgtMsg =
            this->GetCMakeInstance()->GetState()->GetGlobalProperty(
              "TARGET_MESSAGES")) {
        targetMessages = tgtMsg.IsOn();
      }

      if (targetMessages) {
        lg.AppendEcho(commands, "Built target " + name,
                      cmLocalUnixMakefileGenerator3::EchoNormal, &progress);
      }

      this->AppendGlobalTargetDepends(depends, gtarget.get());
      rootLG.WriteMakeRule(ruleFileStream, "All Build rule for target.",
                           localName, depends, commands, true);

      // Write the rule.
      commands.clear();

      {
        // TODO: Convert the total progress count to a make variable.
        std::set<cmGeneratorTarget const*> emitted;
        commands.push_back(cmStrCat(
          "$(CMAKE_COMMAND) -E cmake_progress_start ",
          lg.ConvertToOutputFormat(progress.Dir, cmOutputConverter::SHELL),
          ' ', this->CountProgressMarksInTarget(gtarget.get(), emitted)));
      }
      std::string tmp = "CMakeFiles/Makefile2";
      commands.push_back(lg.GetRecursiveMakeCall(tmp, localName));
      {
        commands.push_back(cmStrCat(
          "$(CMAKE_COMMAND) -E cmake_progress_start ",
          lg.ConvertToOutputFormat(progress.Dir, cmOutputConverter::SHELL),
          " 0"));
      }
      depends.clear();
      if (regenerate) {
        depends.emplace_back("cmake_check_build_system");
      }
      localName =
        cmStrCat(lg.GetRelativeTargetDirectory(gtarget.get()), "/rule");
      rootLG.WriteMakeRule(ruleFileStream,
                           "Build rule for subdir invocation for target.",
                           localName, depends, commands, true);

      // Add a target with the canonical name (no prefix, suffix or path).
      commands.clear();
      depends.clear();
      depends.push_back(localName);
      rootLG.WriteMakeRule(ruleFileStream, "Convenience name for target.",
                           name, depends, commands, true);

      // Add rules to prepare the target for installation.
      if (gtarget->NeedRelinkBeforeInstall(lg.GetConfigName())) {
        localName = cmStrCat(lg.GetRelativeTargetDirectory(gtarget.get()),
                             "/preinstall");
        depends.clear();
        commands.clear();
        commands.push_back(lg.GetRecursiveMakeCall(makefileName, localName));
        rootLG.WriteMakeRule(ruleFileStream,
                             "Pre-install relink rule for target.", localName,
                             depends, commands, true);
      }

      // add the codegen rule
      localName = lg.GetRelativeTargetDirectory(gtarget.get());
      depends.clear();
      commands.clear();
      makeTargetName = cmStrCat(localName, "/codegen");
      commands.push_back(
        lg.GetRecursiveMakeCall(makefileName, makeTargetName));
      if (targetMessages) {
        lg.AppendEcho(commands, "Finished codegen for target " + name,
                      cmLocalUnixMakefileGenerator3::EchoNormal, &progress);
      }
      this->AppendCodegenTargetDepends(depends, gtarget.get());
      rootLG.WriteMakeRule(ruleFileStream, "codegen rule for target.",
                           makeTargetName, depends, commands, true);

      // add the clean rule
      localName = lg.GetRelativeTargetDirectory(gtarget.get());
      makeTargetName = cmStrCat(localName, "/clean");
      depends.clear();
      commands.clear();
      commands.push_back(
        lg.GetRecursiveMakeCall(makefileName, makeTargetName));
      rootLG.WriteMakeRule(ruleFileStream, "clean rule for target.",
                           makeTargetName, depends, commands, true);
      commands.clear();
    }
  }
}

// Build a map that contains the set of targets used by each local
// generator directory level.
void cmGlobalUnixMakefileGenerator3::InitializeProgressMarks()
{
  this->DirectoryTargetsMap.clear();
  // Loop over all targets in all local generators.
  for (auto const& lg : this->LocalGenerators) {
    for (auto const& gt : lg->GetGeneratorTargets()) {
      if (!gt->IsInBuildSystem() || this->IsExcluded(lg.get(), gt.get())) {
        continue;
      }

      cmStateSnapshot csnp = lg->GetStateSnapshot();

      // Consider the directory containing the target and all its parents.
      // An excluded directory may contains non-excluded targets.
      for (; csnp.IsValid(); csnp = csnp.GetBuildsystemDirectoryParent()) {
        // This local generator includes the target.
        std::set<cmGeneratorTarget const*>& targetSet =
          this->DirectoryTargetsMap[csnp];
        targetSet.insert(gt.get());

        // Add dependencies of the included target.  An excluded
        // target may still be included if it is a dependency of a
        // non-excluded target.
        for (cmTargetDepend const& tgtdep :
             this->GetTargetDirectDepends(gt.get())) {
          targetSet.insert(tgtdep);
        }
      }
    }
  }
}

size_t cmGlobalUnixMakefileGenerator3::CountProgressMarksInTarget(
  cmGeneratorTarget const* target, std::set<cmGeneratorTarget const*>& emitted)
{
  size_t count = 0;
  if (emitted.insert(target).second) {
    count = this->ProgressMap[target].Marks.size();
    for (cmTargetDepend const& depend : this->GetTargetDirectDepends(target)) {
      if (!depend->IsInBuildSystem()) {
        continue;
      }
      count += this->CountProgressMarksInTarget(depend, emitted);
    }
  }
  return count;
}

size_t cmGlobalUnixMakefileGenerator3::CountProgressMarksInAll(
  cmLocalGenerator const& lg)
{
  size_t count = 0;
  std::set<cmGeneratorTarget const*> emitted;
  for (cmGeneratorTarget const* target :
       this->DirectoryTargetsMap[lg.GetStateSnapshot()]) {
    if (!this->IsExcluded(&lg, target)) {
      count += this->CountProgressMarksInTarget(target, emitted);
    }
  }
  return count;
}

void cmGlobalUnixMakefileGenerator3::RecordTargetProgress(
  cmMakefileTargetGenerator* tg)
{
  TargetProgress& tp = this->ProgressMap[tg->GetGeneratorTarget()];
  tp.NumberOfActions = tg->GetNumberOfProgressActions();
  tp.VariableFile = tg->GetProgressFileNameFull();
}

void cmGlobalUnixMakefileGenerator3::TargetProgress::WriteProgressVariables(
  unsigned long total, unsigned long& current)
{
  cmGeneratedFileStream fout(this->VariableFile);
  for (unsigned long i = 1; i <= this->NumberOfActions; ++i) {
    fout << "CMAKE_PROGRESS_" << i << " = ";
    if (total <= 100) {
      unsigned long num = i + current;
      fout << num;
      this->Marks.push_back(num);
    } else if (((i + current) * 100) / total >
               ((i - 1 + current) * 100) / total) {
      unsigned long num = ((i + current) * 100) / total;
      fout << num;
      this->Marks.push_back(num);
    }
    fout << "\n";
  }
  fout << "\n";
  current += this->NumberOfActions;
}

void cmGlobalUnixMakefileGenerator3::AppendGlobalTargetDepends(
  std::vector<std::string>& depends, cmGeneratorTarget* target)
{
  for (cmTargetDepend const& i : this->GetTargetDirectDepends(target)) {
    // Create the target-level dependency.
    cmGeneratorTarget const* dep = i;
    if (!dep->IsInBuildSystem()) {
      continue;
    }
    cmLocalUnixMakefileGenerator3* lg3 =
      static_cast<cmLocalUnixMakefileGenerator3*>(dep->GetLocalGenerator());
    std::string tgtName = cmStrCat(
      lg3->GetRelativeTargetDirectory(const_cast<cmGeneratorTarget*>(dep)),
      "/all");
    depends.push_back(tgtName);
  }
}

void cmGlobalUnixMakefileGenerator3::AppendCodegenTargetDepends(
  std::vector<std::string>& depends, cmGeneratorTarget* target)
{
  std::set<std::string> const& codegen_depends =
    target->Target->GetCodegenDeps();

  for (cmTargetDepend const& i : this->GetTargetDirectDepends(target)) {
    // Create the target-level dependency.
    cmGeneratorTarget const* dep = i;
    if (!dep->IsInBuildSystem()) {
      continue;
    }
    if (codegen_depends.find(dep->GetName()) != codegen_depends.end()) {
      cmLocalUnixMakefileGenerator3* lg3 =
        static_cast<cmLocalUnixMakefileGenerator3*>(dep->GetLocalGenerator());
      std::string tgtName = cmStrCat(
        lg3->GetRelativeTargetDirectory(const_cast<cmGeneratorTarget*>(dep)),
        "/all");
      depends.push_back(tgtName);
    }
  }
}

void cmGlobalUnixMakefileGenerator3::ComputeTestPrepTargets()
{
  this->TestPrepTargets.clear();
  this->TestPrepEnabled = false;
  if (this->Makefiles.empty() ||
      this->Makefiles.front()->IsOn("CMAKE_SKIP_TEST_PREP_TARGETS")) {
    return;
  }
  this->TestPrepEnabled = true;

  // Map a generator target to its "<target>.dir/all" recursive rule.
  auto targetAllRule = [](cmGeneratorTarget* gt) -> std::string {
    auto* lg3 =
      static_cast<cmLocalUnixMakefileGenerator3*>(gt->GetLocalGenerator());
    return cmStrCat(lg3->GetRelativeTargetDirectory(gt), "/all");
  };

  // Collect the dependencies of each test, merging tests that share a name
  // across directories (as the Ninja generator does).
  for (auto const& lg : this->LocalGenerators) {
    for (auto const& tester : lg->GetMakefile()->GetTestGenerators()) {
      cmTestGenerator::BuildDependencies deps;
      if (!tester->GetBuildDependencies(lg.get(), std::string(), deps)) {
        continue;
      }
      cmTest* test = tester->GetTest();
      std::string const& testName = test->GetName();

      // A Makefile target name cannot contain ':'.  Such a name is valid for
      // add_test() (e.g. a namespaced name) and works with the Ninja
      // generator, but cannot be expressed as a Makefile rule.
      if (testName.find(':') != std::string::npos) {
        test->GetMakefile()->IssueMessage(
          MessageType::WARNING,
          cmStrCat("Test \"", testName,
                   "\" has a name containing ':', which cannot be used as a "
                   "Makefile build target.  No \"test_prep/\" target will be "
                   "generated for it.  Use the Ninja generator or rename the "
                   "test to build its dependencies with a \"test_prep/\" "
                   "target."),
          test->GetBacktrace());
        continue;
      }

      std::vector<std::string>& rules =
        this->GetTestPrepTarget(cmStrCat("test_prep/", testName)).Rules;

      // Target dependencies are filtered to build-system targets by
      // GetBuildDependencies.
      for (cmGeneratorTarget* dep : deps.Targets) {
        rules.push_back(targetAllRule(dep));
      }

      for (cmTestGenerator::BuildDependencies::FileDependency const& file :
           deps.Files) {
        if (cmGeneratorTarget* owner = file.Owner
              ? file.Owner
              : this->FindOutputOwningTarget(file.Path)) {
          // The file is the primary output of one build-system target; build
          // that target to produce the file.
          rules.push_back(targetAllRule(owner));
        } else if (file.Generated) {
          // The file is generated but cannot be attributed to a single owning
          // target (e.g. a byproduct or an ambiguous/shared output), so the
          // recursive Makefile graph cannot build it from a top-level rule.
          test->GetMakefile()->IssueMessage(
            MessageType::WARNING,
            cmStrCat("Test \"", testName, "\" BUILD_DEPENDS file\n  ",
                     file.Path,
                     "\nis generated but is not the unique output of a build "
                     "target, so the \"test_prep/",
                     testName,
                     "\" target cannot build it with this generator.  Depend "
                     "on the target that produces it (for example one created "
                     "with add_custom_target) instead."),
            test->GetBacktrace());
        }
        // Otherwise the file is not generated by the build (e.g. a source
        // file that already exists) and needs no build rule.
      }
    }

    this->AddDirectoryTestPrepTargets(lg.get());
  }

  // Sort and de-duplicate each rule list (as the Ninja generator does).
  for (auto& entry : this->TestPrepTargets) {
    std::vector<std::string>& rules = entry.second.Rules;
    std::sort(rules.begin(), rules.end());
    rules.erase(std::unique(rules.begin(), rules.end()), rules.end());
  }
}

cmGlobalUnixMakefileGenerator3::TestPrepTarget&
cmGlobalUnixMakefileGenerator3::GetTestPrepTarget(std::string const& name)
{
  // Merge targets whose names differ only in case where the make tool does
  // not distinguish them. Keep the first spelling for the user-facing name.
  TestPrepTarget& testPrepTarget =
    this->TestPrepTargets[this->TargetNamesAreCaseInsensitive()
                            ? cmSystemTools::LowerCase(name)
                            : name];
  if (testPrepTarget.Name.empty()) {
    testPrepTarget.Name = name;
  }
  return testPrepTarget;
}

void cmGlobalUnixMakefileGenerator3::AddDirectoryTestPrepTargets(
  cmLocalGenerator* lg)
{
  cmLocalGenerator::DirectoryTestPrepTarget directoryTarget;
  if (!lg->GetDirectoryTestPrepTarget(
        directoryTarget,
        lg->GetMakefile()->GetSafeDefinition("CMAKE_BUILD_TYPE"))) {
    return;
  }

  std::vector<std::string>& rules =
    this->GetTestPrepTarget(directoryTarget.Name).Rules;

  for (cmLocalGenerator::DirectoryTestPrepDependency const& dep :
       directoryTarget.Dependencies) {
    cmGeneratorTarget* target = dep.Target ? dep.Target : dep.Owner;
    if (!target) {
      target = this->FindOutputOwningTarget(dep.Raw);
    }
    if (target) {
      auto* lg3 = static_cast<cmLocalUnixMakefileGenerator3*>(
        target->GetLocalGenerator());
      rules.push_back(
        cmStrCat(lg3->GetRelativeTargetDirectory(target), "/all"));
    } else if (dep.Generated) {
      lg->GetMakefile()->IssueMessage(
        MessageType::WARNING,
        cmStrCat("Directory test prep dependency\n  ", dep.Raw,
                 "\nis generated but is not the unique output of a build "
                 "target, so the \"",
                 directoryTarget.Name,
                 "\" target cannot build it with this generator.  Depend "
                 "on the target that produces it (for example one created "
                 "with add_custom_target) instead."),
        lg->GetMakefile()->GetBacktrace());
    }
  }
}

void cmGlobalUnixMakefileGenerator3::WriteTestPrepRules(
  std::ostream& makefileStream, cmLocalUnixMakefileGenerator3& rootLG)
{
  if (!this->TestPrepEnabled) {
    return;
  }

  rootLG.WriteDivider(makefileStream);
  makefileStream << "# Targets to build the dependencies of tests.\n\n";

  std::vector<std::string> no_commands;
  std::vector<std::string> allDeps;
  for (auto const& entry : this->TestPrepTargets) {
    // A test whose target name matches "test_prep/all" is prepared by the
    // rule for all tests.
    if (entry.first == "test_prep/all") {
      cm::append(allDeps, entry.second.Rules);
      continue;
    }
    std::vector<std::string> depends = entry.second.Rules;
    if (depends.empty() && !this->EmptyRuleHackDepends.empty()) {
      depends.push_back(this->EmptyRuleHackDepends);
    }
    rootLG.WriteMakeRule(makefileStream, "Build the dependencies of a test.",
                         entry.second.Name, depends, no_commands, true);
    allDeps.push_back(entry.second.Name);
  }

  if (allDeps.empty() && !this->EmptyRuleHackDepends.empty()) {
    allDeps.push_back(this->EmptyRuleHackDepends);
  }
  rootLG.WriteMakeRule(makefileStream, "Build the dependencies of all tests.",
                       "test_prep/all", allDeps, no_commands, true);
}

void cmGlobalUnixMakefileGenerator3::WriteTestPrepConvenienceRules(
  std::ostream& ruleFileStream)
{
  if (!this->TestPrepEnabled) {
    return;
  }

  auto& lg = cm::static_reference_cast<cmLocalUnixMakefileGenerator3>(
    this->LocalGenerators[0]);

  bool regenerate = !this->GlobalSettingIsOn("CMAKE_SUPPRESS_REGENERATION");
  std::string const makefile2 = "CMakeFiles/Makefile2";

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

  lg.WriteDivider(ruleFileStream);
  ruleFileStream << "# Convenience rules to build test dependencies.\n\n";

  for (auto const& entry : this->TestPrepTargets) {
    // The "test_prep/all" rule is written below.
    if (entry.first == "test_prep/all") {
      continue;
    }
    depends.clear();
    if (regenerate) {
      depends.emplace_back("cmake_check_build_system");
    }
    commands.clear();
    commands.push_back(lg.GetRecursiveMakeCall(makefile2, entry.second.Name));
    lg.WriteMakeRule(ruleFileStream, "Build the dependencies of a test.",
                     entry.second.Name, depends, commands, true);
  }

  depends.clear();
  if (regenerate) {
    depends.emplace_back("cmake_check_build_system");
  }
  commands.clear();
  commands.push_back(lg.GetRecursiveMakeCall(makefile2, "test_prep/all"));
  lg.WriteMakeRule(ruleFileStream, "Build the dependencies of a test.",
                   "test_prep/all", depends, commands, true);
}

void cmGlobalUnixMakefileGenerator3::ComputeInstallPrepTargets()
{
  this->InstallPrepComponentTargets.clear();
  this->InstallPrepAllTargets.clear();
  this->InstallPrepOrderedTargets.clear();
  this->InstallPrepEnabled = false;
  if (!this->AreInstallPrepTargetsEnabled()) {
    return;
  }
  this->InstallPrepEnabled = true;
  this->CheckInstallPrepTargets();

  auto const& rootLG =
    cm::static_reference_cast<cmLocalUnixMakefileGenerator3>(
      this->LocalGenerators.front());
  std::string const config = rootLG.GetConfigName();
  InstallPrepTargets const prep = this->GetInstallPrepTargets(config);

  std::set<std::string> unownedGeneratedFiles;
  auto appendTargetRules =
    [this, &config, &unownedGeneratedFiles](
      std::vector<std::string>& rules, cmGeneratorTarget const* gt,
      InstallPrepTargets::TargetRequirements requirements) {
      auto* lg3 =
        static_cast<cmLocalUnixMakefileGenerator3*>(gt->GetLocalGenerator());
      std::string const targetDirectory = lg3->GetRelativeTargetDirectory(gt);
      bool const needsRelink = gt->NeedRelinkBeforeInstall(config);
      if (requirements.InstallArtifact && needsRelink) {
        std::string const orderedRule =
          cmStrCat(targetDirectory, "/install_prep");
        this->InstallPrepOrderedTargets[orderedRule] = {
          cmStrCat(targetDirectory, "/all"),
          cmStrCat(targetDirectory, "/preinstall")
        };
        rules.push_back(orderedRule);
        return;
      }
      // A top-level rule cannot build an individual custom command output, so
      // build the whole target that owns it.  A generated file that is not
      // the unique output of a target is attributed to its installing target.
      for (std::string const& file : requirements.GeneratedFiles) {
        this->CheckInstallPrepGeneratedFile(gt, file, unownedGeneratedFiles);
      }
      if (requirements.Normal ||
          (!requirements.GeneratedFiles.empty() && gt->IsInBuildSystem())) {
        rules.push_back(cmStrCat(targetDirectory, "/all"));
      }
      if (requirements.InstallArtifact) {
        rules.push_back(
          cmStrCat(targetDirectory, needsRelink ? "/preinstall" : "/all"));
      }
    };

  for (auto const& target : prep.All) {
    appendTargetRules(this->InstallPrepAllTargets, target.first,
                      target.second);
  }

  for (auto const& entry : prep.Components) {
    std::string const name = cmStrCat("install_prep/", entry.first);
    // Merge targets whose names differ only in case where the make tool does
    // not distinguish them, as for "test_prep/" targets.  Each of them then
    // prepares a superset of what its installation needs.  Components are
    // visited in order, so the first spelling names the target.
    std::string const key = this->TargetNamesAreCaseInsensitive()
      ? cmSystemTools::LowerCase(name)
      : name;
    std::vector<std::string>* rules = &this->InstallPrepAllTargets;
    if (key != "install_prep/all") {
      InstallPrepTarget& prepTarget = this->InstallPrepComponentTargets[key];
      if (prepTarget.Name.empty()) {
        prepTarget.Name = name;
      }
      rules = &prepTarget.Rules;
    }
    for (auto const& target : entry.second) {
      appendTargetRules(*rules, target.first, target.second);
    }
  }

  auto sortAndRemoveDuplicates = [](std::vector<std::string>& rules) {
    std::sort(rules.begin(), rules.end());
    rules.erase(std::unique(rules.begin(), rules.end()), rules.end());
  };
  sortAndRemoveDuplicates(this->InstallPrepAllTargets);
  for (auto& entry : this->InstallPrepComponentTargets) {
    sortAndRemoveDuplicates(entry.second.Rules);
  }
}

void cmGlobalUnixMakefileGenerator3::WriteInstallPrepRules(
  std::ostream& makefileStream, cmLocalUnixMakefileGenerator3& rootLG)
{
  if (!this->InstallPrepEnabled) {
    return;
  }

  std::vector<std::string> noCommands;
  std::string const makefile2 = "CMakeFiles/Makefile2";
  for (auto const& ordered : this->InstallPrepOrderedTargets) {
    std::vector<std::string> depends{ ordered.second.NormalRule };
    std::vector<std::string> commands{ rootLG.GetRecursiveMakeCall(
      makefile2, ordered.second.PreinstallRule) };
    rootLG.WriteMakeRule(makefileStream, nullptr, ordered.first, depends,
                         commands, true);
  }

  for (auto const& entry : this->InstallPrepComponentTargets) {
    std::vector<std::string> depends = entry.second.Rules;
    if (depends.empty() && !this->EmptyRuleHackDepends.empty()) {
      depends.push_back(this->EmptyRuleHackDepends);
    }
    rootLG.WriteMakeRule(makefileStream, nullptr, entry.second.Name, depends,
                         noCommands, true);
  }

  std::vector<std::string> allDepends = this->InstallPrepAllTargets;
  if (allDepends.empty() && !this->EmptyRuleHackDepends.empty()) {
    allDepends.push_back(this->EmptyRuleHackDepends);
  }
  rootLG.WriteMakeRule(makefileStream, nullptr, "install_prep/all", allDepends,
                       noCommands, true);
}

void cmGlobalUnixMakefileGenerator3::WriteInstallPrepConvenienceRules(
  std::ostream& ruleFileStream)
{
  if (!this->InstallPrepEnabled) {
    return;
  }

  auto& lg = cm::static_reference_cast<cmLocalUnixMakefileGenerator3>(
    this->LocalGenerators[0]);

  bool regenerate = !this->GlobalSettingIsOn("CMAKE_SUPPRESS_REGENERATION");
  std::string const makefile2 = "CMakeFiles/Makefile2";

  std::vector<std::string> depends;
  std::vector<std::string> commands;
  auto writeForward = [&](std::string const& prepName) {
    depends.clear();
    if (regenerate) {
      depends.emplace_back("cmake_check_build_system");
    }
    commands.clear();
    commands.push_back(lg.GetRecursiveMakeCall(makefile2, prepName));
    lg.WriteMakeRule(ruleFileStream, nullptr, prepName, depends, commands,
                     true);
  };

  for (auto const& entry : this->InstallPrepComponentTargets) {
    writeForward(entry.second.Name);
  }
  writeForward("install_prep/all");
}

void cmGlobalUnixMakefileGenerator3::WriteHelpRule(
  std::ostream& ruleFileStream, cmLocalUnixMakefileGenerator3* lg)
{
  // add the help target
  std::string path;
  std::vector<std::string> no_depends;
  std::vector<std::string> commands;
  lg->AppendEcho(commands,
                 "The following are some of the valid targets "
                 "for this Makefile:");
  lg->AppendEcho(commands, "... all (the default if no target is provided)");
  lg->AppendEcho(commands, "... clean");
  if (!this->GlobalSettingIsOn("CMAKE_SUPPRESS_REGENERATION")) {
    lg->AppendEcho(commands, "... depend");
  }
  if (this->CheckCMP0171()) {
    lg->AppendEcho(commands, "... codegen");
  }

  // Keep track of targets already listed.
  std::set<std::string> emittedTargets;
  std::set<std::string> utility_targets;
  std::set<std::string> globals_targets;
  std::set<std::string> project_targets;

  // for each local generator
  for (auto const& localGen : this->LocalGenerators) {
    auto const& lg2 =
      cm::static_reference_cast<cmLocalUnixMakefileGenerator3>(localGen);
    // for the passed in makefile or if this is the top Makefile wripte out
    // the targets
    if (&lg2 == lg || lg->IsRootMakefile()) {
      // for each target Generate the rule files for each target.
      for (auto const& target : lg2.GetGeneratorTargets()) {
        cm::TargetType type = target->GetType();
        if ((type == cm::TargetType::EXECUTABLE) ||
            (type == cm::TargetType::STATIC_LIBRARY) ||
            (type == cm::TargetType::SHARED_LIBRARY) ||
            (type == cm::TargetType::MODULE_LIBRARY) ||
            (type == cm::TargetType::OBJECT_LIBRARY) ||
            (type == cm::TargetType::INTERFACE_LIBRARY &&
             target->IsInBuildSystem())) {
          project_targets.insert(target->GetName());
        } else if (type == cm::TargetType::GLOBAL_TARGET) {
          globals_targets.insert(target->GetName());
        } else if (type == cm::TargetType::UTILITY) {
          utility_targets.insert(target->GetName());
        }
      }
    }
  }

  for (std::string const& name : globals_targets) {
    path = cmStrCat("... ", name);
    lg->AppendEcho(commands, path);
  }
  for (std::string const& name : utility_targets) {
    path = cmStrCat("... ", name);
    lg->AppendEcho(commands, path);
  }
  for (std::string const& name : project_targets) {
    path = cmStrCat("... ", name);
    lg->AppendEcho(commands, path);
  }

  for (std::string const& o : lg->GetLocalHelp()) {
    path = cmStrCat("... ", o);
    lg->AppendEcho(commands, path);
  }
  lg->WriteMakeRule(ruleFileStream, "Help Target", "help", no_depends,
                    commands, true);
  ruleFileStream << "\n\n";
}