Source/cmMakefile.cxx

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

#include "cmsys/FStream.hxx"
#include "cmsys/RegularExpression.hxx"
#include <algorithm>
#include <assert.h>
#include <cstring>
#include <ctype.h>
#include <iterator>
#include <memory> // IWYU pragma: keep
#include <sstream>
#include <stdio.h>
#include <stdlib.h>
#include <utility>

#include "cmAlgorithms.h"
#include "cmCommand.h"
#include "cmCommandArgumentParserHelper.h"
#include "cmCustomCommand.h"
#include "cmCustomCommandLines.h"
#include "cmExecutionStatus.h"
#include "cmExpandedCommandArgument.h" // IWYU pragma: keep
#include "cmFileLockPool.h"
#include "cmFunctionBlocker.h"
#include "cmGeneratorExpression.h"
#include "cmGeneratorExpressionEvaluationFile.h"
#include "cmGlobalGenerator.h"
#include "cmInstallGenerator.h" // IWYU pragma: keep
#include "cmListFileCache.h"
#include "cmSourceFile.h"
#include "cmSourceFileLocation.h"
#include "cmState.h"
#include "cmStateDirectory.h"
#include "cmStateTypes.h"
#include "cmSystemTools.h"
#include "cmTargetLinkLibraryType.h"
#include "cmTest.h"
#include "cmTestGenerator.h" // IWYU pragma: keep
#include "cmVersion.h"
#include "cmWorkingDirectory.h"
#include "cm_sys_stat.h"
#include "cmake.h"

#ifdef CMAKE_BUILD_WITH_CMAKE
#  include "cmVariableWatch.h"
#endif

class cmMessenger;

cmDirectoryId::cmDirectoryId(std::string s)
  : String(std::move(s))
{
}

// default is not to be building executables
cmMakefile::cmMakefile(cmGlobalGenerator* globalGenerator,
                       cmStateSnapshot const& snapshot)
  : GlobalGenerator(globalGenerator)
  , StateSnapshot(snapshot)
  , Backtrace(snapshot)
{
  this->IsSourceFileTryCompile = false;

  this->WarnUnused = this->GetCMakeInstance()->GetWarnUnused();
  this->CheckSystemVars = this->GetCMakeInstance()->GetCheckSystemVars();

  this->SuppressWatches = false;

  // Setup the default include complaint regular expression (match nothing).
  this->ComplainFileRegularExpression = "^$";

  this->DefineFlags = " ";

  this->cmDefineRegex.compile("#([ \t]*)cmakedefine[ \t]+([A-Za-z_0-9]*)");
  this->cmDefine01Regex.compile("#([ \t]*)cmakedefine01[ \t]+([A-Za-z_0-9]*)");
  this->cmAtVarRegex.compile("(@[A-Za-z_0-9/.+-]+@)");
  this->cmNamedCurly.compile("^[A-Za-z0-9/_.+-]+{");

  this->StateSnapshot =
    this->StateSnapshot.GetState()->CreatePolicyScopeSnapshot(
      this->StateSnapshot);

  // Enter a policy level for this directory.
  this->PushPolicy();

  // push empty loop block
  this->PushLoopBlockBarrier();

  // By default the check is not done.  It is enabled by
  // cmListFileCache in the top level if necessary.
  this->CheckCMP0000 = false;

#if defined(CMAKE_BUILD_WITH_CMAKE)
  this->AddSourceGroup("", "^.*$");
  this->AddSourceGroup("Source Files", CM_SOURCE_REGEX);
  this->AddSourceGroup("Header Files", CM_HEADER_REGEX);
  this->AddSourceGroup("CMake Rules", "\\.rule$");
  this->AddSourceGroup("Resources", CM_RESOURCE_REGEX);
  this->AddSourceGroup("Object Files", "\\.(lo|o|obj)$");

  this->ObjectLibrariesSourceGroupIndex = this->SourceGroups.size();
  this->SourceGroups.emplace_back("Object Libraries", "^MATCH_NO_SOURCES$");
#endif
}

cmMakefile::~cmMakefile()
{
  cmDeleteAll(this->InstallGenerators);
  cmDeleteAll(this->TestGenerators);
  cmDeleteAll(this->SourceFiles);
  cmDeleteAll(this->Tests);
  cmDeleteAll(this->ImportedTargetsOwned);
  cmDeleteAll(this->FinalPassCommands);
  cmDeleteAll(this->FunctionBlockers);
  cmDeleteAll(this->EvaluationFiles);
}

cmDirectoryId cmMakefile::GetDirectoryId() const
{
  // Use the instance pointer value to uniquely identify this directory.
  // If we ever need to expose this to CMake language code we should
  // add a read-only property in cmMakefile::GetProperty.
  char buf[32];
  sprintf(buf, "<%p>",
          static_cast<void const*>(this)); // cast avoids format warning
  return std::string(buf);
}

void cmMakefile::IssueMessage(cmake::MessageType t,
                              std::string const& text) const
{
  if (!this->ExecutionStatusStack.empty()) {
    if ((t == cmake::FATAL_ERROR) || (t == cmake::INTERNAL_ERROR)) {
      this->ExecutionStatusStack.back()->SetNestedError();
    }
  }
  this->GetCMakeInstance()->IssueMessage(t, text, this->GetBacktrace());
}

bool cmMakefile::CheckCMP0037(std::string const& targetName,
                              cmStateEnums::TargetType targetType) const
{
  cmake::MessageType messageType = cmake::AUTHOR_WARNING;
  std::ostringstream e;
  bool issueMessage = false;
  switch (this->GetPolicyStatus(cmPolicies::CMP0037)) {
    case cmPolicies::WARN:
      if (targetType != cmStateEnums::INTERFACE_LIBRARY) {
        e << cmPolicies::GetPolicyWarning(cmPolicies::CMP0037) << "\n";
        issueMessage = true;
      }
      CM_FALLTHROUGH;
    case cmPolicies::OLD:
      break;
    case cmPolicies::NEW:
    case cmPolicies::REQUIRED_IF_USED:
    case cmPolicies::REQUIRED_ALWAYS:
      issueMessage = true;
      messageType = cmake::FATAL_ERROR;
      break;
  }
  if (issueMessage) {
    e << "The target name \"" << targetName
      << "\" is reserved or not valid for certain "
         "CMake features, such as generator expressions, and may result "
         "in undefined behavior.";
    this->IssueMessage(messageType, e.str());

    if (messageType == cmake::FATAL_ERROR) {
      return false;
    }
  }
  return true;
}

void cmMakefile::MaybeWarnCMP0074(std::string const& pkg)
{
  // Warn if a <pkg>_ROOT variable we may use is set.
  std::string const varName = pkg + "_ROOT";
  const char* var = this->GetDefinition(varName);
  std::string env;
  cmSystemTools::GetEnv(varName, env);

  bool const haveVar = var && *var;
  bool const haveEnv = !env.empty();
  if ((haveVar || haveEnv) && this->WarnedCMP0074.insert(varName).second) {
    std::ostringstream w;
    w << cmPolicies::GetPolicyWarning(cmPolicies::CMP0074) << "\n";
    if (haveVar) {
      w << "CMake variable " << varName << " is set to:\n"
        << "  " << var << "\n";
    }
    if (haveEnv) {
      w << "Environment variable " << varName << " is set to:\n"
        << "  " << env << "\n";
    }
    w << "For compatibility, CMake is ignoring the variable.";
    this->IssueMessage(cmake::AUTHOR_WARNING, w.str());
  }
}

cmStringRange cmMakefile::GetIncludeDirectoriesEntries() const
{
  return this->StateSnapshot.GetDirectory().GetIncludeDirectoriesEntries();
}

cmBacktraceRange cmMakefile::GetIncludeDirectoriesBacktraces() const
{
  return this->StateSnapshot.GetDirectory()
    .GetIncludeDirectoriesEntryBacktraces();
}

cmStringRange cmMakefile::GetCompileOptionsEntries() const
{
  return this->StateSnapshot.GetDirectory().GetCompileOptionsEntries();
}

cmBacktraceRange cmMakefile::GetCompileOptionsBacktraces() const
{
  return this->StateSnapshot.GetDirectory().GetCompileOptionsEntryBacktraces();
}

cmStringRange cmMakefile::GetCompileDefinitionsEntries() const
{
  return this->StateSnapshot.GetDirectory().GetCompileDefinitionsEntries();
}

cmBacktraceRange cmMakefile::GetCompileDefinitionsBacktraces() const
{
  return this->StateSnapshot.GetDirectory()
    .GetCompileDefinitionsEntryBacktraces();
}

cmStringRange cmMakefile::GetLinkOptionsEntries() const
{
  return this->StateSnapshot.GetDirectory().GetLinkOptionsEntries();
}

cmBacktraceRange cmMakefile::GetLinkOptionsBacktraces() const
{
  return this->StateSnapshot.GetDirectory().GetLinkOptionsEntryBacktraces();
}

cmStringRange cmMakefile::GetLinkDirectoriesEntries() const
{
  return this->StateSnapshot.GetDirectory().GetLinkDirectoriesEntries();
}

cmBacktraceRange cmMakefile::GetLinkDirectoriesBacktraces() const
{
  return this->StateSnapshot.GetDirectory()
    .GetLinkDirectoriesEntryBacktraces();
}

cmListFileBacktrace cmMakefile::GetBacktrace() const
{
  return this->Backtrace;
}

cmListFileBacktrace cmMakefile::GetBacktrace(cmCommandContext const& cc) const
{
  cmListFileContext lfc;
  lfc.Name = cc.Name.Original;
  lfc.Line = cc.Line;
  lfc.FilePath = this->StateSnapshot.GetExecutionListFile();
  return this->Backtrace.Push(lfc);
}

cmListFileContext cmMakefile::GetExecutionContext() const
{
  cmListFileContext const& cur = this->Backtrace.Top();
  cmListFileContext lfc;
  lfc.Name = cur.Name;
  lfc.Line = cur.Line;
  lfc.FilePath = this->StateSnapshot.GetExecutionListFile();
  return lfc;
}

void cmMakefile::PrintCommandTrace(const cmListFileFunction& lff) const
{
  // Check if current file in the list of requested to trace...
  std::vector<std::string> const& trace_only_this_files =
    this->GetCMakeInstance()->GetTraceSources();
  std::string const& full_path = this->GetExecutionFilePath();
  std::string const& only_filename = cmSystemTools::GetFilenameName(full_path);
  bool trace = trace_only_this_files.empty();
  if (!trace) {
    for (std::vector<std::string>::const_iterator i =
           trace_only_this_files.begin();
         !trace && i != trace_only_this_files.end(); ++i) {
      std::string::size_type const pos = full_path.rfind(*i);
      trace = (pos != std::string::npos) &&
        ((pos + i->size()) == full_path.size()) &&
        (only_filename == cmSystemTools::GetFilenameName(*i));
    }
    // Do nothing if current file wasn't requested for trace...
    if (!trace) {
      return;
    }
  }

  std::ostringstream msg;
  msg << full_path << "(" << lff.Line << "):  ";
  msg << lff.Name.Original << "(";
  bool expand = this->GetCMakeInstance()->GetTraceExpand();
  std::string temp;
  for (cmListFileArgument const& arg : lff.Arguments) {
    if (expand) {
      temp = arg.Value;
      this->ExpandVariablesInString(temp);
      msg << temp;
    } else {
      msg << arg.Value;
    }
    msg << " ";
  }
  msg << ")";
  cmSystemTools::Message(msg.str().c_str());
}

// Helper class to make sure the call stack is valid.
class cmMakefileCall
{
public:
  cmMakefileCall(cmMakefile* mf, cmCommandContext const& cc,
                 cmExecutionStatus& status)
    : Makefile(mf)
  {
    cmListFileContext const& lfc = cmListFileContext::FromCommandContext(
      cc, this->Makefile->StateSnapshot.GetExecutionListFile());
    this->Makefile->Backtrace = this->Makefile->Backtrace.Push(lfc);
    this->Makefile->ExecutionStatusStack.push_back(&status);
  }

  ~cmMakefileCall()
  {
    this->Makefile->ExecutionStatusStack.pop_back();
    this->Makefile->Backtrace = this->Makefile->Backtrace.Pop();
  }

private:
  cmMakefile* Makefile;
};

bool cmMakefile::ExecuteCommand(const cmListFileFunction& lff,
                                cmExecutionStatus& status)
{
  bool result = true;

  // quick return if blocked
  if (this->IsFunctionBlocked(lff, status)) {
    // No error.
    return result;
  }

  // Place this call on the call stack.
  cmMakefileCall stack_manager(this, lff, status);
  static_cast<void>(stack_manager);

  // Lookup the command prototype.
  if (cmCommand* proto =
        this->GetState()->GetCommandByExactName(lff.Name.Lower)) {
    // Clone the prototype.
    std::unique_ptr<cmCommand> pcmd(proto->Clone());
    pcmd->SetMakefile(this);

    // Decide whether to invoke the command.
    if (!cmSystemTools::GetFatalErrorOccured()) {
      // if trace is enabled, print out invoke information
      if (this->GetCMakeInstance()->GetTrace()) {
        this->PrintCommandTrace(lff);
      }
      // Try invoking the command.
      bool invokeSucceeded = pcmd->InvokeInitialPass(lff.Arguments, status);
      bool hadNestedError = status.GetNestedError();
      if (!invokeSucceeded || hadNestedError) {
        if (!hadNestedError) {
          // The command invocation requested that we report an error.
          std::string const error =
            std::string(lff.Name.Original) + " " + pcmd->GetError();
          this->IssueMessage(cmake::FATAL_ERROR, error);
        }
        result = false;
        if (this->GetCMakeInstance()->GetWorkingMode() != cmake::NORMAL_MODE) {
          cmSystemTools::SetFatalErrorOccured();
        }
      } else if (pcmd->HasFinalPass()) {
        // use the command
        this->FinalPassCommands.push_back(pcmd.release());
      }
    }
  } else {
    if (!cmSystemTools::GetFatalErrorOccured()) {
      std::string error = "Unknown CMake command \"";
      error += lff.Name.Original;
      error += "\".";
      this->IssueMessage(cmake::FATAL_ERROR, error);
      result = false;
      cmSystemTools::SetFatalErrorOccured();
    }
  }

  return result;
}

class cmMakefile::IncludeScope
{
public:
  IncludeScope(cmMakefile* mf, std::string const& filenametoread,
               bool noPolicyScope);
  ~IncludeScope();
  void Quiet() { this->ReportError = false; }

private:
  cmMakefile* Makefile;
  bool NoPolicyScope;
  bool CheckCMP0011;
  bool ReportError;
  void EnforceCMP0011();
};

cmMakefile::IncludeScope::IncludeScope(cmMakefile* mf,
                                       std::string const& filenametoread,
                                       bool noPolicyScope)
  : Makefile(mf)
  , NoPolicyScope(noPolicyScope)
  , CheckCMP0011(false)
  , ReportError(true)
{
  this->Makefile->Backtrace = this->Makefile->Backtrace.Push(filenametoread);

  this->Makefile->PushFunctionBlockerBarrier();

  this->Makefile->StateSnapshot =
    this->Makefile->GetState()->CreateIncludeFileSnapshot(
      this->Makefile->StateSnapshot, filenametoread);
  if (!this->NoPolicyScope) {
    // Check CMP0011 to determine the policy scope type.
    switch (this->Makefile->GetPolicyStatus(cmPolicies::CMP0011)) {
      case cmPolicies::WARN:
        // We need to push a scope to detect whether the script sets
        // any policies that would affect the includer and therefore
        // requires a warning.  We use a weak scope to simulate OLD
        // behavior by allowing policy changes to affect the includer.
        this->Makefile->PushPolicy(true);
        this->CheckCMP0011 = true;
        break;
      case cmPolicies::OLD:
        // OLD behavior is to not push a scope at all.
        this->NoPolicyScope = true;
        break;
      case cmPolicies::REQUIRED_IF_USED:
      case cmPolicies::REQUIRED_ALWAYS:
        // We should never make this policy required, but we handle it
        // here just in case.
        this->CheckCMP0011 = true;
        CM_FALLTHROUGH;
      case cmPolicies::NEW:
        // NEW behavior is to push a (strong) scope.
        this->Makefile->PushPolicy();
        break;
    }
  }
}

cmMakefile::IncludeScope::~IncludeScope()
{
  if (!this->NoPolicyScope) {
    // If we need to enforce policy CMP0011 then the top entry is the
    // one we pushed above.  If the entry is empty, then the included
    // script did not set any policies that might affect the includer so
    // we do not need to enforce the policy.
    if (this->CheckCMP0011 &&
        !this->Makefile->StateSnapshot.HasDefinedPolicyCMP0011()) {
      this->CheckCMP0011 = false;
    }

    // Pop the scope we pushed for the script.
    this->Makefile->PopPolicy();

    // We enforce the policy after the script's policy stack entry has
    // been removed.
    if (this->CheckCMP0011) {
      this->EnforceCMP0011();
    }
  }
  this->Makefile->PopSnapshot(this->ReportError);

  this->Makefile->PopFunctionBlockerBarrier(this->ReportError);

  this->Makefile->Backtrace = this->Makefile->Backtrace.Pop();
}

void cmMakefile::IncludeScope::EnforceCMP0011()
{
  // We check the setting of this policy again because the included
  // script might actually set this policy for its includer.
  switch (this->Makefile->GetPolicyStatus(cmPolicies::CMP0011)) {
    case cmPolicies::WARN:
      // Warn because the user did not set this policy.
      {
        std::ostringstream w;
        w << cmPolicies::GetPolicyWarning(cmPolicies::CMP0011) << "\n"
          << "The included script\n  "
          << this->Makefile->GetExecutionFilePath() << "\n"
          << "affects policy settings.  "
          << "CMake is implying the NO_POLICY_SCOPE option for compatibility, "
          << "so the effects are applied to the including context.";
        this->Makefile->IssueMessage(cmake::AUTHOR_WARNING, w.str());
      }
      break;
    case cmPolicies::REQUIRED_IF_USED:
    case cmPolicies::REQUIRED_ALWAYS: {
      std::ostringstream e;
      /* clang-format off */
      e << cmPolicies::GetRequiredPolicyError(cmPolicies::CMP0011) << "\n"
        << "The included script\n  "
        << this->Makefile->GetExecutionFilePath() << "\n"
        << "affects policy settings, so it requires this policy to be set.";
      /* clang-format on */
      this->Makefile->IssueMessage(cmake::FATAL_ERROR, e.str());
    } break;
    case cmPolicies::OLD:
    case cmPolicies::NEW:
      // The script set this policy.  We assume the purpose of the
      // script is to initialize policies for its includer, and since
      // the policy is now set for later scripts, we do not warn.
      break;
  }
}

bool cmMakefile::ReadDependentFile(const char* filename, bool noPolicyScope)
{
  this->AddDefinition("CMAKE_PARENT_LIST_FILE",
                      this->GetDefinition("CMAKE_CURRENT_LIST_FILE"));
  std::string filenametoread = cmSystemTools::CollapseFullPath(
    filename, this->GetCurrentSourceDirectory());

  IncludeScope incScope(this, filenametoread, noPolicyScope);

  cmListFile listFile;
  if (!listFile.ParseFile(filenametoread.c_str(), this->GetMessenger(),
                          this->Backtrace)) {
    return false;
  }

  this->ReadListFile(listFile, filenametoread);
  if (cmSystemTools::GetFatalErrorOccured()) {
    incScope.Quiet();
  }
  return true;
}

class cmMakefile::ListFileScope
{
public:
  ListFileScope(cmMakefile* mf, std::string const& filenametoread)
    : Makefile(mf)
    , ReportError(true)
  {
    this->Makefile->Backtrace = this->Makefile->Backtrace.Push(filenametoread);

    this->Makefile->StateSnapshot =
      this->Makefile->GetState()->CreateInlineListFileSnapshot(
        this->Makefile->StateSnapshot, filenametoread);
    assert(this->Makefile->StateSnapshot.IsValid());

    this->Makefile->PushFunctionBlockerBarrier();
  }

  ~ListFileScope()
  {
    this->Makefile->PopSnapshot(this->ReportError);
    this->Makefile->PopFunctionBlockerBarrier(this->ReportError);
    this->Makefile->Backtrace = this->Makefile->Backtrace.Pop();
  }

  void Quiet() { this->ReportError = false; }

private:
  cmMakefile* Makefile;
  bool ReportError;
};

bool cmMakefile::ReadListFile(const char* filename)
{
  std::string filenametoread = cmSystemTools::CollapseFullPath(
    filename, this->GetCurrentSourceDirectory());

  ListFileScope scope(this, filenametoread);

  cmListFile listFile;
  if (!listFile.ParseFile(filenametoread.c_str(), this->GetMessenger(),
                          this->Backtrace)) {
    return false;
  }

  this->ReadListFile(listFile, filenametoread);
  if (cmSystemTools::GetFatalErrorOccured()) {
    scope.Quiet();
  }
  return true;
}

void cmMakefile::ReadListFile(cmListFile const& listFile,
                              std::string const& filenametoread)
{
  // add this list file to the list of dependencies
  this->ListFiles.push_back(filenametoread);

  std::string currentParentFile =
    this->GetSafeDefinition("CMAKE_PARENT_LIST_FILE");
  std::string currentFile = this->GetSafeDefinition("CMAKE_CURRENT_LIST_FILE");

  this->AddDefinition("CMAKE_CURRENT_LIST_FILE", filenametoread.c_str());
  this->AddDefinition("CMAKE_CURRENT_LIST_DIR",
                      cmSystemTools::GetFilenamePath(filenametoread).c_str());

  this->MarkVariableAsUsed("CMAKE_PARENT_LIST_FILE");
  this->MarkVariableAsUsed("CMAKE_CURRENT_LIST_FILE");
  this->MarkVariableAsUsed("CMAKE_CURRENT_LIST_DIR");

  // Run the parsed commands.
  const size_t numberFunctions = listFile.Functions.size();
  for (size_t i = 0; i < numberFunctions; ++i) {
    cmExecutionStatus status;
    this->ExecuteCommand(listFile.Functions[i], status);
    if (cmSystemTools::GetFatalErrorOccured()) {
      break;
    }
    if (status.GetReturnInvoked()) {
      // Exit early due to return command.
      break;
    }
  }
  this->CheckForUnusedVariables();

  this->AddDefinition("CMAKE_PARENT_LIST_FILE", currentParentFile.c_str());
  this->AddDefinition("CMAKE_CURRENT_LIST_FILE", currentFile.c_str());
  this->AddDefinition("CMAKE_CURRENT_LIST_DIR",
                      cmSystemTools::GetFilenamePath(currentFile).c_str());
  this->MarkVariableAsUsed("CMAKE_PARENT_LIST_FILE");
  this->MarkVariableAsUsed("CMAKE_CURRENT_LIST_FILE");
  this->MarkVariableAsUsed("CMAKE_CURRENT_LIST_DIR");
}

void cmMakefile::EnforceDirectoryLevelRules() const
{
  // Diagnose a violation of CMP0000 if necessary.
  if (this->CheckCMP0000) {
    std::ostringstream msg;
    msg << "No cmake_minimum_required command is present.  "
        << "A line of code such as\n"
        << "  cmake_minimum_required(VERSION " << cmVersion::GetMajorVersion()
        << "." << cmVersion::GetMinorVersion() << ")\n"
        << "should be added at the top of the file.  "
        << "The version specified may be lower if you wish to "
        << "support older CMake versions for this project.  "
        << "For more information run "
        << "\"cmake --help-policy CMP0000\".";
    switch (this->GetPolicyStatus(cmPolicies::CMP0000)) {
      case cmPolicies::WARN:
        // Warn because the user did not provide a minimum required
        // version.
        this->GetCMakeInstance()->IssueMessage(cmake::AUTHOR_WARNING,
                                               msg.str(), this->Backtrace);
      case cmPolicies::OLD:
        // OLD behavior is to use policy version 2.4 set in
        // cmListFileCache.
        break;
      case cmPolicies::REQUIRED_IF_USED:
      case cmPolicies::REQUIRED_ALWAYS:
      case cmPolicies::NEW:
        // NEW behavior is to issue an error.
        this->GetCMakeInstance()->IssueMessage(cmake::FATAL_ERROR, msg.str(),
                                               this->Backtrace);
        cmSystemTools::SetFatalErrorOccured();
        return;
    }
  }
}

void cmMakefile::AddEvaluationFile(
  const std::string& inputFile,
  std::unique_ptr<cmCompiledGeneratorExpression> outputName,
  std::unique_ptr<cmCompiledGeneratorExpression> condition,
  bool inputIsContent)
{
  this->EvaluationFiles.push_back(new cmGeneratorExpressionEvaluationFile(
    inputFile, std::move(outputName), std::move(condition), inputIsContent,
    this->GetPolicyStatus(cmPolicies::CMP0070)));
}

std::vector<cmGeneratorExpressionEvaluationFile*>
cmMakefile::GetEvaluationFiles() const
{
  return this->EvaluationFiles;
}

std::vector<cmExportBuildFileGenerator*>
cmMakefile::GetExportBuildFileGenerators() const
{
  return this->ExportBuildFileGenerators;
}

void cmMakefile::RemoveExportBuildFileGeneratorCMP0024(
  cmExportBuildFileGenerator* gen)
{
  std::vector<cmExportBuildFileGenerator*>::iterator it =
    std::find(this->ExportBuildFileGenerators.begin(),
              this->ExportBuildFileGenerators.end(), gen);
  if (it != this->ExportBuildFileGenerators.end()) {
    this->ExportBuildFileGenerators.erase(it);
  }
}

void cmMakefile::AddExportBuildFileGenerator(cmExportBuildFileGenerator* gen)
{
  this->ExportBuildFileGenerators.push_back(gen);
}

namespace {
struct file_not_persistent
{
  bool operator()(const std::string& path) const
  {
    return !(path.find("CMakeTmp") == std::string::npos &&
             cmSystemTools::FileExists(path));
  }
};
}

void cmMakefile::FinalPass()
{
  // do all the variable expansions here
  this->ExpandVariablesCMP0019();

  // give all the commands a chance to do something
  // after the file has been parsed before generation
  for (cmCommand* fpCommand : this->FinalPassCommands) {
    fpCommand->FinalPass();
  }

  // go through all configured files and see which ones still exist.
  // we don't want cmake to re-run if a configured file is created and deleted
  // during processing as that would make it a transient file that can't
  // influence the build process
  cmEraseIf(this->OutputFiles, file_not_persistent());

  // if a configured file is used as input for another configured file,
  // and then deleted it will show up in the input list files so we
  // need to scan those too
  cmEraseIf(this->ListFiles, file_not_persistent());
}

// Generate the output file
void cmMakefile::ConfigureFinalPass()
{
  this->FinalPass();
  const char* oldValue = this->GetDefinition("CMAKE_BACKWARDS_COMPATIBILITY");
  if (oldValue &&
      cmSystemTools::VersionCompare(cmSystemTools::OP_LESS, oldValue, "2.4")) {
    this->GetCMakeInstance()->IssueMessage(
      cmake::FATAL_ERROR,
      "You have set CMAKE_BACKWARDS_COMPATIBILITY to a CMake version less "
      "than 2.4. This version of CMake only supports backwards compatibility "
      "with CMake 2.4 or later. For compatibility with older versions please "
      "use any CMake 2.8.x release or lower.",
      this->Backtrace);
  }
}

void cmMakefile::AddCustomCommandToTarget(
  const std::string& target, const std::vector<std::string>& byproducts,
  const std::vector<std::string>& depends,
  const cmCustomCommandLines& commandLines, cmTarget::CustomCommandType type,
  const char* comment, const char* workingDir, bool escapeOldStyle,
  bool uses_terminal, const std::string& depfile, bool command_expand_lists,
  ObjectLibraryCommands objLibraryCommands)
{
  // Find the target to which to add the custom command.
  cmTargets::iterator ti = this->Targets.find(target);

  if (ti == this->Targets.end()) {
    cmake::MessageType messageType = cmake::AUTHOR_WARNING;
    bool issueMessage = false;
    std::ostringstream e;
    switch (this->GetPolicyStatus(cmPolicies::CMP0040)) {
      case cmPolicies::WARN:
        e << cmPolicies::GetPolicyWarning(cmPolicies::CMP0040) << "\n";
        issueMessage = true;
      case cmPolicies::OLD:
        break;
      case cmPolicies::NEW:
      case cmPolicies::REQUIRED_IF_USED:
      case cmPolicies::REQUIRED_ALWAYS:
        issueMessage = true;
        messageType = cmake::FATAL_ERROR;
    }

    if (issueMessage) {
      if (cmTarget const* t = this->FindTargetToUse(target)) {
        if (t->IsImported()) {
          e << "TARGET '" << target
            << "' is IMPORTED and does not build here.";
        } else {
          e << "TARGET '" << target << "' was not created in this directory.";
        }
      } else {
        e << "No TARGET '" << target
          << "' has been created in this directory.";
      }
      IssueMessage(messageType, e.str());
    }

    return;
  }

  cmTarget& t = ti->second;
  if (objLibraryCommands == RejectObjectLibraryCommands &&
      t.GetType() == cmStateEnums::OBJECT_LIBRARY) {
    std::ostringstream e;
    e << "Target \"" << target
      << "\" is an OBJECT library "
         "that may not have PRE_BUILD, PRE_LINK, or POST_BUILD commands.";
    this->IssueMessage(cmake::FATAL_ERROR, e.str());
    return;
  }
  if (t.GetType() == cmStateEnums::INTERFACE_LIBRARY) {
    std::ostringstream e;
    e << "Target \"" << target
      << "\" is an INTERFACE library "
         "that may not have PRE_BUILD, PRE_LINK, or POST_BUILD commands.";
    this->IssueMessage(cmake::FATAL_ERROR, e.str());
    return;
  }

  // Always create the byproduct sources and mark them generated.
  for (std::string const& o : byproducts) {
    if (cmSourceFile* out = this->GetOrCreateSource(o, true)) {
      out->SetProperty("GENERATED", "1");
    }
  }

  // Add the command to the appropriate build step for the target.
  std::vector<std::string> no_output;
  cmCustomCommand cc(this, no_output, byproducts, depends, commandLines,
                     comment, workingDir);
  cc.SetEscapeOldStyle(escapeOldStyle);
  cc.SetEscapeAllowMakeVars(true);
  cc.SetUsesTerminal(uses_terminal);
  cc.SetCommandExpandLists(command_expand_lists);
  cc.SetDepfile(depfile);
  switch (type) {
    case cmTarget::PRE_BUILD:
      t.AddPreBuildCommand(cc);
      break;
    case cmTarget::PRE_LINK:
      t.AddPreLinkCommand(cc);
      break;
    case cmTarget::POST_BUILD:
      t.AddPostBuildCommand(cc);
      break;
  }
}

cmSourceFile* cmMakefile::AddCustomCommandToOutput(
  const std::vector<std::string>& outputs,
  const std::vector<std::string>& byproducts,
  const std::vector<std::string>& depends, const std::string& main_dependency,
  const cmCustomCommandLines& commandLines, const char* comment,
  const char* workingDir, bool replace, bool escapeOldStyle,
  bool uses_terminal, bool command_expand_lists, const std::string& depfile)
{
  // Make sure there is at least one output.
  if (outputs.empty()) {
    cmSystemTools::Error("Attempt to add a custom rule with no output!");
    return nullptr;
  }

  // Validate custom commands.  TODO: More strict?
  for (cmCustomCommandLine const& cl : commandLines) {
    if (!cl.empty() && !cl[0].empty() && cl[0][0] == '"') {
      std::ostringstream e;
      e << "COMMAND may not contain literal quotes:\n  " << cl[0] << "\n";
      this->IssueMessage(cmake::FATAL_ERROR, e.str());
      return nullptr;
    }
  }

  // Choose a source file on which to store the custom command.
  cmSourceFile* file = nullptr;
  if (!commandLines.empty() && !main_dependency.empty()) {
    // The main dependency was specified.  Use it unless a different
    // custom command already used it.
    file = this->GetSource(main_dependency);
    if (file && file->GetCustomCommand() && !replace) {
      // The main dependency already has a custom command.
      if (commandLines == file->GetCustomCommand()->GetCommandLines()) {
        // The existing custom command is identical.  Silently ignore
        // the duplicate.
        return file;
      }
      // The existing custom command is different.  We need to
      // generate a rule file for this new command.
      file = nullptr;
    } else if (!file) {
      file = this->CreateSource(main_dependency);
    }
  }

  // Generate a rule file if the main dependency is not available.
  if (!file) {
    cmGlobalGenerator* gg = this->GetGlobalGenerator();

    // Construct a rule file associated with the first output produced.
    std::string outName = gg->GenerateRuleFile(outputs[0]);

    // Check if the rule file already exists.
    file = this->GetSource(outName, cmSourceFileLocationKind::Known);
    if (file && file->GetCustomCommand() && !replace) {
      // The rule file already exists.
      if (commandLines != file->GetCustomCommand()->GetCommandLines()) {
        cmSystemTools::Error("Attempt to add a custom rule to output \"",
                             outName.c_str(),
                             "\" which already has a custom rule.");
      }
      return file;
    }

    // Create a cmSourceFile for the rule file.
    if (!file) {
      file =
        this->CreateSource(outName, true, cmSourceFileLocationKind::Known);
    }
    file->SetProperty("__CMAKE_RULE", "1");
  }

  // Always create the output sources and mark them generated.
  for (std::string const& o : outputs) {
    if (cmSourceFile* out =
          this->GetOrCreateSource(o, true, cmSourceFileLocationKind::Known)) {
      out->SetProperty("GENERATED", "1");
    }
  }
  for (std::string const& o : byproducts) {
    if (cmSourceFile* out =
          this->GetOrCreateSource(o, true, cmSourceFileLocationKind::Known)) {
      out->SetProperty("GENERATED", "1");
    }
  }

  // Attach the custom command to the file.
  if (file) {
    // Construct a complete list of dependencies.
    std::vector<std::string> depends2(depends);
    if (!main_dependency.empty()) {
      depends2.push_back(main_dependency);
    }

    cmCustomCommand* cc = new cmCustomCommand(
      this, outputs, byproducts, depends2, commandLines, comment, workingDir);
    cc->SetEscapeOldStyle(escapeOldStyle);
    cc->SetEscapeAllowMakeVars(true);
    cc->SetUsesTerminal(uses_terminal);
    cc->SetCommandExpandLists(command_expand_lists);
    cc->SetDepfile(depfile);
    file->SetCustomCommand(cc);
    this->UpdateOutputToSourceMap(outputs, file);
  }
  return file;
}

void cmMakefile::UpdateOutputToSourceMap(
  std::vector<std::string> const& outputs, cmSourceFile* source)
{
  for (std::string const& o : outputs) {
    this->UpdateOutputToSourceMap(o, source);
  }
}

void cmMakefile::UpdateOutputToSourceMap(std::string const& output,
                                         cmSourceFile* source)
{
  OutputToSourceMap::iterator i = this->OutputToSource.find(output);
  if (i != this->OutputToSource.end()) {
    // Multiple custom commands produce the same output but may
    // be attached to a different source file (MAIN_DEPENDENCY).
    // LinearGetSourceFileWithOutput would return the first one,
    // so keep the mapping for the first one.
    //
    // TODO: Warn the user about this case.  However, the VS 8 generator
    // triggers it for separate generate.stamp rules in ZERO_CHECK and
    // individual targets.
    return;
  }
  this->OutputToSource[output] = source;
}

cmSourceFile* cmMakefile::AddCustomCommandToOutput(
  const std::string& output, const std::vector<std::string>& depends,
  const std::string& main_dependency, const cmCustomCommandLines& commandLines,
  const char* comment, const char* workingDir, bool replace,
  bool escapeOldStyle, bool uses_terminal, bool command_expand_lists,
  const std::string& depfile)
{
  std::vector<std::string> outputs;
  outputs.push_back(output);
  std::vector<std::string> no_byproducts;
  return this->AddCustomCommandToOutput(
    outputs, no_byproducts, depends, main_dependency, commandLines, comment,
    workingDir, replace, escapeOldStyle, uses_terminal, command_expand_lists,
    depfile);
}

void cmMakefile::AddCustomCommandOldStyle(
  const std::string& target, const std::vector<std::string>& outputs,
  const std::vector<std::string>& depends, const std::string& source,
  const cmCustomCommandLines& commandLines, const char* comment)
{
  // Translate the old-style signature to one of the new-style
  // signatures.
  if (source == target) {
    // In the old-style signature if the source and target were the
    // same then it added a post-build rule to the target.  Preserve
    // this behavior.
    std::vector<std::string> no_byproducts;
    this->AddCustomCommandToTarget(target, no_byproducts, depends,
                                   commandLines, cmTarget::POST_BUILD, comment,
                                   nullptr);
    return;
  }

  // Each output must get its own copy of this rule.
  cmsys::RegularExpression sourceFiles("\\.(C|M|c|c\\+\\+|cc|cpp|cxx|cu|m|mm|"
                                       "rc|def|r|odl|idl|hpj|bat|h|h\\+\\+|"
                                       "hm|hpp|hxx|in|txx|inl)$");
  for (std::string const& oi : outputs) {
    // Get the name of this output.
    const char* output = oi.c_str();
    cmSourceFile* sf;

    // Choose whether to use a main dependency.
    if (sourceFiles.find(source)) {
      // The source looks like a real file.  Use it as the main dependency.
      sf = this->AddCustomCommandToOutput(output, depends, source,
                                          commandLines, comment, nullptr);
    } else {
      // The source may not be a real file.  Do not use a main dependency.
      std::string no_main_dependency;
      std::vector<std::string> depends2 = depends;
      depends2.push_back(source);
      sf = this->AddCustomCommandToOutput(output, depends2, no_main_dependency,
                                          commandLines, comment, nullptr);
    }

    // If the rule was added to the source (and not a .rule file),
    // then add the source to the target to make sure the rule is
    // included.
    if (sf && !sf->GetPropertyAsBool("__CMAKE_RULE")) {
      cmTargets::iterator ti = this->Targets.find(target);
      if (ti != this->Targets.end()) {
        ti->second.AddSource(sf->GetFullPath());
      } else {
        cmSystemTools::Error("Attempt to add a custom rule to a target "
                             "that does not exist yet for target ",
                             target.c_str());
        return;
      }
    }
  }
}

cmTarget* cmMakefile::AddUtilityCommand(
  const std::string& utilityName, TargetOrigin origin, bool excludeFromAll,
  const std::vector<std::string>& depends, const char* workingDirectory,
  const char* command, const char* arg1, const char* arg2, const char* arg3,
  const char* arg4)
{
  // Construct the command line for the custom command.
  cmCustomCommandLine commandLine;
  commandLine.push_back(command);
  if (arg1) {
    commandLine.push_back(arg1);
  }
  if (arg2) {
    commandLine.push_back(arg2);
  }
  if (arg3) {
    commandLine.push_back(arg3);
  }
  if (arg4) {
    commandLine.push_back(arg4);
  }
  cmCustomCommandLines commandLines;
  commandLines.push_back(std::move(commandLine));

  // Call the real signature of this method.
  return this->AddUtilityCommand(utilityName, origin, excludeFromAll,
                                 workingDirectory, depends, commandLines);
}

cmTarget* cmMakefile::AddUtilityCommand(
  const std::string& utilityName, TargetOrigin origin, bool excludeFromAll,
  const char* workingDirectory, const std::vector<std::string>& depends,
  const cmCustomCommandLines& commandLines, bool escapeOldStyle,
  const char* comment, bool uses_terminal, bool command_expand_lists)
{
  std::vector<std::string> no_byproducts;
  return this->AddUtilityCommand(utilityName, origin, excludeFromAll,
                                 workingDirectory, no_byproducts, depends,
                                 commandLines, escapeOldStyle, comment,
                                 uses_terminal, command_expand_lists);
}

cmTarget* cmMakefile::AddUtilityCommand(
  const std::string& utilityName, TargetOrigin origin, bool excludeFromAll,
  const char* workingDirectory, const std::vector<std::string>& byproducts,
  const std::vector<std::string>& depends,
  const cmCustomCommandLines& commandLines, bool escapeOldStyle,
  const char* comment, bool uses_terminal, bool command_expand_lists)
{
  // Create a target instance for this utility.
  cmTarget* target = this->AddNewTarget(cmStateEnums::UTILITY, utilityName);
  target->SetIsGeneratorProvided(origin == TargetOrigin::Generator);
  if (excludeFromAll) {
    target->SetProperty("EXCLUDE_FROM_ALL", "TRUE");
  }
  if (!comment) {
    // Use an empty comment to avoid generation of default comment.
    comment = "";
  }

  // Store the custom command in the target.
  if (!commandLines.empty() || !depends.empty()) {
    std::string force = this->GetCurrentBinaryDirectory();
    force += cmake::GetCMakeFilesDirectory();
    force += "/";
    force += utilityName;
    std::vector<std::string> forced;
    forced.push_back(force);
    std::string no_main_dependency;
    bool no_replace = false;
    this->AddCustomCommandToOutput(
      forced, byproducts, depends, no_main_dependency, commandLines, comment,
      workingDirectory, no_replace, escapeOldStyle, uses_terminal,
      command_expand_lists);
    cmSourceFile* sf = target->AddSourceCMP0049(force);

    // The output is not actually created so mark it symbolic.
    if (sf) {
      sf->SetProperty("SYMBOLIC", "1");
    } else {
      cmSystemTools::Error("Could not get source file entry for ",
                           force.c_str());
    }

    // Always create the byproduct sources and mark them generated.
    for (std::string const& byproduct : byproducts) {
      if (cmSourceFile* out = this->GetOrCreateSource(
            byproduct, true, cmSourceFileLocationKind::Known)) {
        out->SetProperty("GENERATED", "1");
      }
    }
  }
  return target;
}

static void s_AddDefineFlag(std::string const& flag, std::string& dflags)
{
  // remove any \n\r
  std::string::size_type initSize = dflags.size();
  dflags += ' ';
  dflags += flag;
  std::string::iterator flagStart = dflags.begin() + initSize + 1;
  std::replace(flagStart, dflags.end(), '\n', ' ');
  std::replace(flagStart, dflags.end(), '\r', ' ');
}

void cmMakefile::AddDefineFlag(std::string const& flag)
{
  if (flag.empty()) {
    return;
  }

  // Update the string used for the old DEFINITIONS property.
  s_AddDefineFlag(flag, this->DefineFlagsOrig);

  // If this is really a definition, update COMPILE_DEFINITIONS.
  if (this->ParseDefineFlag(flag, false)) {
    return;
  }

  // Add this flag that does not look like a definition.
  s_AddDefineFlag(flag, this->DefineFlags);
}

static void s_RemoveDefineFlag(std::string const& flag, std::string& dflags)
{
  std::string::size_type const len = flag.length();
  // Remove all instances of the flag that are surrounded by
  // whitespace or the beginning/end of the string.
  for (std::string::size_type lpos = dflags.find(flag, 0);
       lpos != std::string::npos; lpos = dflags.find(flag, lpos)) {
    std::string::size_type rpos = lpos + len;
    if ((lpos <= 0 || isspace(dflags[lpos - 1])) &&
        (rpos >= dflags.size() || isspace(dflags[rpos]))) {
      dflags.erase(lpos, len);
    } else {
      ++lpos;
    }
  }
}

void cmMakefile::RemoveDefineFlag(std::string const& flag)
{
  // Check the length of the flag to remove.
  if (flag.empty()) {
    return;
  }

  // Update the string used for the old DEFINITIONS property.
  s_RemoveDefineFlag(flag, this->DefineFlagsOrig);

  // If this is really a definition, update COMPILE_DEFINITIONS.
  if (this->ParseDefineFlag(flag, true)) {
    return;
  }

  // Remove this flag that does not look like a definition.
  s_RemoveDefineFlag(flag, this->DefineFlags);
}

void cmMakefile::AddCompileDefinition(std::string const& option)
{
  this->AppendProperty("COMPILE_DEFINITIONS", option.c_str());
}

void cmMakefile::AddCompileOption(std::string const& option)
{
  this->AppendProperty("COMPILE_OPTIONS", option.c_str());
}

void cmMakefile::AddLinkOption(std::string const& option)
{
  this->AppendProperty("LINK_OPTIONS", option.c_str());
}

void cmMakefile::AddLinkDirectory(std::string const& directory, bool before)
{
  cmListFileBacktrace lfbt = this->GetBacktrace();
  if (before) {
    this->StateSnapshot.GetDirectory().PrependLinkDirectoriesEntry(directory,
                                                                   lfbt);
  } else {
    this->StateSnapshot.GetDirectory().AppendLinkDirectoriesEntry(directory,
                                                                  lfbt);
  }
}

bool cmMakefile::ParseDefineFlag(std::string const& def, bool remove)
{
  // Create a regular expression to match valid definitions.
  static cmsys::RegularExpression valid("^[-/]D[A-Za-z_][A-Za-z0-9_]*(=.*)?$");

  // Make sure the definition matches.
  if (!valid.find(def)) {
    return false;
  }

  // Definitions with non-trivial values require a policy check.
  static cmsys::RegularExpression trivial(
    "^[-/]D[A-Za-z_][A-Za-z0-9_]*(=[A-Za-z0-9_.]+)?$");
  if (!trivial.find(def)) {
    // This definition has a non-trivial value.
    switch (this->GetPolicyStatus(cmPolicies::CMP0005)) {
      case cmPolicies::WARN:
        this->IssueMessage(cmake::AUTHOR_WARNING,
                           cmPolicies::GetPolicyWarning(cmPolicies::CMP0005));
        CM_FALLTHROUGH;
      case cmPolicies::OLD:
        // OLD behavior is to not escape the value.  We should not
        // convert the definition to use the property.
        return false;
      case cmPolicies::REQUIRED_IF_USED:
      case cmPolicies::REQUIRED_ALWAYS:
        this->IssueMessage(
          cmake::FATAL_ERROR,
          cmPolicies::GetRequiredPolicyError(cmPolicies::CMP0005));
        return false;
      case cmPolicies::NEW:
        // NEW behavior is to escape the value.  Proceed to convert it
        // to an entry in the property.
        break;
    }
  }

  // Get the definition part after the flag.
  const char* define = def.c_str() + 2;

  if (remove) {
    if (const char* cdefs = this->GetProperty("COMPILE_DEFINITIONS")) {
      // Expand the list.
      std::vector<std::string> defs;
      cmSystemTools::ExpandListArgument(cdefs, defs);

      // Recompose the list without the definition.
      std::vector<std::string>::const_iterator defEnd =
        std::remove(defs.begin(), defs.end(), define);
      std::vector<std::string>::const_iterator defBegin = defs.begin();
      std::string ndefs = cmJoin(cmMakeRange(defBegin, defEnd), ";");

      // Store the new list.
      this->SetProperty("COMPILE_DEFINITIONS", ndefs.c_str());
    }
  } else {
    // Append the definition to the directory property.
    this->AppendProperty("COMPILE_DEFINITIONS", define);
  }

  return true;
}

void cmMakefile::InitializeFromParent(cmMakefile* parent)
{
  this->SystemIncludeDirectories = parent->SystemIncludeDirectories;

  // define flags
  this->DefineFlags = parent->DefineFlags;
  this->DefineFlagsOrig = parent->DefineFlagsOrig;

  // Include transform property.  There is no per-config version.
  {
    const char* prop = "IMPLICIT_DEPENDS_INCLUDE_TRANSFORM";
    this->SetProperty(prop, parent->GetProperty(prop));
  }

  // compile definitions property and per-config versions
  cmPolicies::PolicyStatus polSt = this->GetPolicyStatus(cmPolicies::CMP0043);
  if (polSt == cmPolicies::WARN || polSt == cmPolicies::OLD) {
    this->SetProperty("COMPILE_DEFINITIONS",
                      parent->GetProperty("COMPILE_DEFINITIONS"));
    std::vector<std::string> configs;
    this->GetConfigurations(configs);
    for (std::string const& config : configs) {
      std::string defPropName = "COMPILE_DEFINITIONS_";
      defPropName += cmSystemTools::UpperCase(config);
      const char* prop = parent->GetProperty(defPropName);
      this->SetProperty(defPropName, prop);
    }
  }

  // labels
  this->SetProperty("LABELS", parent->GetProperty("LABELS"));

  // link libraries
  this->SetProperty("LINK_LIBRARIES", parent->GetProperty("LINK_LIBRARIES"));

  // the initial project name
  this->StateSnapshot.SetProjectName(parent->StateSnapshot.GetProjectName());

  // Copy include regular expressions.
  this->ComplainFileRegularExpression = parent->ComplainFileRegularExpression;

  // Imported targets.
  this->ImportedTargets = parent->ImportedTargets;
}

void cmMakefile::PushFunctionScope(std::string const& fileName,
                                   const cmPolicies::PolicyMap& pm)
{
  this->StateSnapshot = this->GetState()->CreateFunctionCallSnapshot(
    this->StateSnapshot, fileName);
  assert(this->StateSnapshot.IsValid());

  this->PushLoopBlockBarrier();

#if defined(CMAKE_BUILD_WITH_CMAKE)
  this->GetGlobalGenerator()->GetFileLockPool().PushFunctionScope();
#endif

  this->PushFunctionBlockerBarrier();

  this->PushPolicy(true, pm);
}

void cmMakefile::PopFunctionScope(bool reportError)
{
  this->PopPolicy();

  this->PopSnapshot(reportError);

  this->PopFunctionBlockerBarrier(reportError);

#if defined(CMAKE_BUILD_WITH_CMAKE)
  this->GetGlobalGenerator()->GetFileLockPool().PopFunctionScope();
#endif

  this->PopLoopBlockBarrier();

  this->CheckForUnusedVariables();
}

void cmMakefile::PushMacroScope(std::string const& fileName,
                                const cmPolicies::PolicyMap& pm)
{
  this->StateSnapshot =
    this->GetState()->CreateMacroCallSnapshot(this->StateSnapshot, fileName);
  assert(this->StateSnapshot.IsValid());

  this->PushFunctionBlockerBarrier();

  this->PushPolicy(true, pm);
}

void cmMakefile::PopMacroScope(bool reportError)
{
  this->PopPolicy();
  this->PopSnapshot(reportError);

  this->PopFunctionBlockerBarrier(reportError);
}

bool cmMakefile::IsRootMakefile() const
{
  return !this->StateSnapshot.GetBuildsystemDirectoryParent().IsValid();
}

class cmMakefile::BuildsystemFileScope
{
public:
  BuildsystemFileScope(cmMakefile* mf)
    : Makefile(mf)
    , ReportError(true)
  {
    std::string currentStart =
      this->Makefile->StateSnapshot.GetDirectory().GetCurrentSource();
    currentStart += "/CMakeLists.txt";
    this->Makefile->StateSnapshot.SetListFile(currentStart);
    this->Makefile->StateSnapshot =
      this->Makefile->StateSnapshot.GetState()->CreatePolicyScopeSnapshot(
        this->Makefile->StateSnapshot);
    this->Makefile->PushFunctionBlockerBarrier();

    this->GG = mf->GetGlobalGenerator();
    this->CurrentMakefile = this->GG->GetCurrentMakefile();
    this->Snapshot = this->GG->GetCMakeInstance()->GetCurrentSnapshot();
    this->GG->GetCMakeInstance()->SetCurrentSnapshot(this->Snapshot);
    this->GG->SetCurrentMakefile(mf);
#if defined(CMAKE_BUILD_WITH_CMAKE)
    this->GG->GetFileLockPool().PushFileScope();
#endif
  }

  ~BuildsystemFileScope()
  {
    this->Makefile->PopFunctionBlockerBarrier(this->ReportError);
    this->Makefile->PopSnapshot(this->ReportError);
#if defined(CMAKE_BUILD_WITH_CMAKE)
    this->GG->GetFileLockPool().PopFileScope();
#endif
    this->GG->SetCurrentMakefile(this->CurrentMakefile);
    this->GG->GetCMakeInstance()->SetCurrentSnapshot(this->Snapshot);
  }

  void Quiet() { this->ReportError = false; }

private:
  cmMakefile* Makefile;
  cmGlobalGenerator* GG;
  cmMakefile* CurrentMakefile;
  cmStateSnapshot Snapshot;
  bool ReportError;
};

void cmMakefile::Configure()
{
  std::string currentStart =
    this->StateSnapshot.GetDirectory().GetCurrentSource();
  currentStart += "/CMakeLists.txt";

  // Add the bottom of all backtraces within this directory.
  // We will never pop this scope because it should be available
  // for messages during the generate step too.
  this->Backtrace = this->Backtrace.Push(currentStart);

  BuildsystemFileScope scope(this);

  // make sure the CMakeFiles dir is there
  std::string filesDir = this->StateSnapshot.GetDirectory().GetCurrentBinary();
  filesDir += cmake::GetCMakeFilesDirectory();
  cmSystemTools::MakeDirectory(filesDir);

  assert(cmSystemTools::FileExists(currentStart, true));
  this->AddDefinition("CMAKE_PARENT_LIST_FILE", currentStart.c_str());

  cmListFile listFile;
  if (!listFile.ParseFile(currentStart.c_str(), this->GetMessenger(),
                          this->Backtrace)) {
    return;
  }
  if (this->IsRootMakefile()) {
    bool hasVersion = false;
    // search for the right policy command
    for (cmListFileFunction const& func : listFile.Functions) {
      if (func.Name.Lower == "cmake_minimum_required") {
        hasVersion = true;
        break;
      }
    }
    // if no policy command is found this is an error if they use any
    // non advanced functions or a lot of functions
    if (!hasVersion) {
      bool isProblem = true;
      if (listFile.Functions.size() < 30) {
        // the list of simple commands DO NOT ADD TO THIS LIST!!!!!
        // these commands must have backwards compatibility forever and
        // and that is a lot longer than your tiny mind can comprehend mortal
        std::set<std::string> allowedCommands;
        allowedCommands.insert("project");
        allowedCommands.insert("set");
        allowedCommands.insert("if");
        allowedCommands.insert("endif");
        allowedCommands.insert("else");
        allowedCommands.insert("elseif");
        allowedCommands.insert("add_executable");
        allowedCommands.insert("add_library");
        allowedCommands.insert("target_link_libraries");
        allowedCommands.insert("option");
        allowedCommands.insert("message");
        isProblem = false;
        for (cmListFileFunction const& func : listFile.Functions) {
          if (allowedCommands.find(func.Name.Lower) == allowedCommands.end()) {
            isProblem = true;
            break;
          }
        }
      }

      if (isProblem) {
        // Tell the top level cmMakefile to diagnose
        // this violation of CMP0000.
        this->SetCheckCMP0000(true);

        // Implicitly set the version for the user.
        this->SetPolicyVersion("2.4", std::string());
      }
    }
    bool hasProject = false;
    // search for a project command
    for (cmListFileFunction const& func : listFile.Functions) {
      if (func.Name.Lower == "project") {
        hasProject = true;
        break;
      }
    }
    // if no project command is found, add one
    if (!hasProject) {
      cmListFileFunction project;
      project.Name.Lower = "project";
      project.Arguments.emplace_back("Project", cmListFileArgument::Unquoted,
                                     0);
      project.Arguments.emplace_back("__CMAKE_INJECTED_PROJECT_COMMAND__",
                                     cmListFileArgument::Unquoted, 0);
      listFile.Functions.insert(listFile.Functions.begin(), project);
    }
  }

  this->ReadListFile(listFile, currentStart);
  if (cmSystemTools::GetFatalErrorOccured()) {
    scope.Quiet();
  }

  // at the end handle any old style subdirs
  std::vector<cmMakefile*> subdirs = this->UnConfiguredDirectories;

  // for each subdir recurse
  std::vector<cmMakefile*>::iterator sdi = subdirs.begin();
  for (; sdi != subdirs.end(); ++sdi) {
    (*sdi)->StateSnapshot.InitializeFromParent_ForSubdirsCommand();
    this->ConfigureSubDirectory(*sdi);
  }

  this->AddCMakeDependFilesFromUser();
}

void cmMakefile::ConfigureSubDirectory(cmMakefile* mf)
{
  mf->InitializeFromParent(this);
  std::string currentStart = mf->GetCurrentSourceDirectory();
  if (this->GetCMakeInstance()->GetDebugOutput()) {
    std::string msg = "   Entering             ";
    msg += currentStart;
    cmSystemTools::Message(msg.c_str());
  }

  std::string const currentStartFile = currentStart + "/CMakeLists.txt";
  if (!cmSystemTools::FileExists(currentStartFile, true)) {
    // The file is missing.  Check policy CMP0014.
    std::ostringstream e;
    /* clang-format off */
    e << "The source directory\n"
      << "  " << currentStart << "\n"
      << "does not contain a CMakeLists.txt file.";
    /* clang-format on */
    switch (this->GetPolicyStatus(cmPolicies::CMP0014)) {
      case cmPolicies::WARN:
        // Print the warning.
        /* clang-format off */
        e << "\n"
          << "CMake does not support this case but it used "
          << "to work accidentally and is being allowed for "
          << "compatibility."
          << "\n"
          << cmPolicies::GetPolicyWarning(cmPolicies::CMP0014);
        /* clang-format on */
        this->IssueMessage(cmake::AUTHOR_WARNING, e.str());
      case cmPolicies::OLD:
        // OLD behavior does not warn.
        break;
      case cmPolicies::REQUIRED_IF_USED:
      case cmPolicies::REQUIRED_ALWAYS:
        e << "\n" << cmPolicies::GetRequiredPolicyError(cmPolicies::CMP0014);
        CM_FALLTHROUGH;
      case cmPolicies::NEW:
        // NEW behavior prints the error.
        this->IssueMessage(cmake::FATAL_ERROR, e.str());
    }
    return;
  }
  // finally configure the subdir
  mf->Configure();

  if (this->GetCMakeInstance()->GetDebugOutput()) {
    std::string msg = "   Returning to         ";
    msg += this->GetCurrentSourceDirectory();
    cmSystemTools::Message(msg.c_str());
  }
}

void cmMakefile::AddSubDirectory(const std::string& srcPath,
                                 const std::string& binPath,
                                 bool excludeFromAll, bool immediate)
{
  // Make sure the binary directory is unique.
  if (!this->EnforceUniqueDir(srcPath, binPath)) {
    return;
  }

  cmStateSnapshot newSnapshot =
    this->GetState()->CreateBuildsystemDirectorySnapshot(this->StateSnapshot);

  newSnapshot.GetDirectory().SetCurrentSource(srcPath);
  newSnapshot.GetDirectory().SetCurrentBinary(binPath);

  cmSystemTools::MakeDirectory(binPath);

  cmMakefile* subMf = new cmMakefile(this->GlobalGenerator, newSnapshot);
  this->GetGlobalGenerator()->AddMakefile(subMf);

  if (excludeFromAll) {
    subMf->SetProperty("EXCLUDE_FROM_ALL", "TRUE");
  }

  if (immediate) {
    this->ConfigureSubDirectory(subMf);
  } else {
    this->UnConfiguredDirectories.push_back(subMf);
  }
}

const std::string& cmMakefile::GetCurrentSourceDirectory() const
{
  return this->StateSnapshot.GetDirectory().GetCurrentSource();
}

const std::string& cmMakefile::GetCurrentBinaryDirectory() const
{
  return this->StateSnapshot.GetDirectory().GetCurrentBinary();
}

std::vector<cmTarget*> cmMakefile::GetImportedTargets() const
{
  std::vector<cmTarget*> tgts;
  tgts.reserve(this->ImportedTargets.size());
  for (auto const& impTarget : this->ImportedTargets) {
    tgts.push_back(impTarget.second);
  }
  return tgts;
}

void cmMakefile::AddIncludeDirectories(const std::vector<std::string>& incs,
                                       bool before)
{
  if (incs.empty()) {
    return;
  }

  cmListFileBacktrace lfbt = this->GetBacktrace();
  std::string entryString = cmJoin(incs, ";");
  if (before) {
    this->StateSnapshot.GetDirectory().PrependIncludeDirectoriesEntry(
      entryString, lfbt);
  } else {
    this->StateSnapshot.GetDirectory().AppendIncludeDirectoriesEntry(
      entryString, lfbt);
  }

  // Property on each target:
  for (auto& target : this->Targets) {
    cmTarget& t = target.second;
    t.InsertInclude(entryString, lfbt, before);
  }
}

void cmMakefile::AddSystemIncludeDirectories(const std::set<std::string>& incs)
{
  if (incs.empty()) {
    return;
  }

  this->SystemIncludeDirectories.insert(incs.begin(), incs.end());

  for (auto& target : this->Targets) {
    cmTarget& t = target.second;
    t.AddSystemIncludeDirectories(incs);
  }
}

void cmMakefile::AddDefinition(const std::string& name, const char* value)
{
  if (!value) {
    return;
  }

  if (this->VariableInitialized(name)) {
    this->LogUnused("changing definition", name);
  }
  this->StateSnapshot.SetDefinition(name, value);

#ifdef CMAKE_BUILD_WITH_CMAKE
  cmVariableWatch* vv = this->GetVariableWatch();
  if (vv) {
    vv->VariableAccessed(name, cmVariableWatch::VARIABLE_MODIFIED_ACCESS,
                         value, this);
  }
#endif
}

void cmMakefile::AddCacheDefinition(const std::string& name, const char* value,
                                    const char* doc,
                                    cmStateEnums::CacheEntryType type,
                                    bool force)
{
  const std::string* existingValue =
    this->GetState()->GetInitializedCacheValue(name);
  // must be outside the following if() to keep it alive long enough
  std::string nvalue;

  if (existingValue &&
      (this->GetState()->GetCacheEntryType(name) ==
       cmStateEnums::UNINITIALIZED)) {
    // if this is not a force, then use the value from the cache
    // if it is a force, then use the value being passed in
    if (!force) {
      value = existingValue->c_str();
    }
    if (type == cmStateEnums::PATH || type == cmStateEnums::FILEPATH) {
      std::vector<std::string>::size_type cc;
      std::vector<std::string> files;
      nvalue = value ? value : "";

      cmSystemTools::ExpandListArgument(nvalue, files);
      nvalue.clear();
      for (cc = 0; cc < files.size(); cc++) {
        if (!cmSystemTools::IsOff(files[cc])) {
          files[cc] = cmSystemTools::CollapseFullPath(files[cc]);
        }
        if (cc > 0) {
          nvalue += ";";
        }
        nvalue += files[cc];
      }

      this->GetCMakeInstance()->AddCacheEntry(name, nvalue.c_str(), doc, type);
      nvalue = *this->GetState()->GetInitializedCacheValue(name);
      value = nvalue.c_str();
    }
  }
  this->GetCMakeInstance()->AddCacheEntry(name, value, doc, type);
  // if there was a definition then remove it
  this->StateSnapshot.RemoveDefinition(name);
}

void cmMakefile::AddDefinition(const std::string& name, bool value)
{
  if (this->VariableInitialized(name)) {
    this->LogUnused("changing definition", name);
  }

  this->StateSnapshot.SetDefinition(name, value ? "ON" : "OFF");

#ifdef CMAKE_BUILD_WITH_CMAKE
  cmVariableWatch* vv = this->GetVariableWatch();
  if (vv) {
    vv->VariableAccessed(name, cmVariableWatch::VARIABLE_MODIFIED_ACCESS,
                         value ? "ON" : "OFF", this);
  }
#endif
}

void cmMakefile::CheckForUnusedVariables() const
{
  if (!this->WarnUnused) {
    return;
  }
  const std::vector<std::string>& unused = this->StateSnapshot.UnusedKeys();
  std::vector<std::string>::const_iterator it = unused.begin();
  for (; it != unused.end(); ++it) {
    this->LogUnused("out of scope", *it);
  }
}

void cmMakefile::MarkVariableAsUsed(const std::string& var)
{
  this->StateSnapshot.GetDefinition(var);
}

bool cmMakefile::VariableInitialized(const std::string& var) const
{
  return this->StateSnapshot.IsInitialized(var);
}

void cmMakefile::LogUnused(const char* reason, const std::string& name) const
{
  if (this->WarnUnused) {
    std::string path;
    if (!this->ExecutionStatusStack.empty()) {
      path = this->GetExecutionContext().FilePath;
    } else {
      path = this->GetCurrentSourceDirectory();
      path += "/CMakeLists.txt";
    }

    if (this->CheckSystemVars ||
        cmSystemTools::IsSubDirectory(path, this->GetHomeDirectory()) ||
        (cmSystemTools::IsSubDirectory(path, this->GetHomeOutputDirectory()) &&
         !cmSystemTools::IsSubDirectory(path,
                                        cmake::GetCMakeFilesDirectory()))) {
      std::ostringstream msg;
      msg << "unused variable (" << reason << ") \'" << name << "\'";
      this->IssueMessage(cmake::AUTHOR_WARNING, msg.str());
    }
  }
}

void cmMakefile::RemoveDefinition(const std::string& name)
{
  if (this->VariableInitialized(name)) {
    this->LogUnused("unsetting", name);
  }
  this->StateSnapshot.RemoveDefinition(name);
#ifdef CMAKE_BUILD_WITH_CMAKE
  cmVariableWatch* vv = this->GetVariableWatch();
  if (vv) {
    vv->VariableAccessed(name, cmVariableWatch::VARIABLE_REMOVED_ACCESS,
                         nullptr, this);
  }
#endif
}

void cmMakefile::RemoveCacheDefinition(const std::string& name)
{
  this->GetState()->RemoveCacheEntry(name);
}

void cmMakefile::SetProjectName(std::string const& p)
{
  this->StateSnapshot.SetProjectName(p);
}

void cmMakefile::AddGlobalLinkInformation(cmTarget& target)
{
  // for these targets do not add anything
  switch (target.GetType()) {
    case cmStateEnums::UTILITY:
    case cmStateEnums::GLOBAL_TARGET:
    case cmStateEnums::INTERFACE_LIBRARY:
      return;
    default:;
  }

  if (const char* linkLibsProp = this->GetProperty("LINK_LIBRARIES")) {
    std::vector<std::string> linkLibs;
    cmSystemTools::ExpandListArgument(linkLibsProp, linkLibs);

    for (std::vector<std::string>::iterator j = linkLibs.begin();
         j != linkLibs.end(); ++j) {
      std::string libraryName = *j;
      cmTargetLinkLibraryType libType = GENERAL_LibraryType;
      if (libraryName == "optimized") {
        libType = OPTIMIZED_LibraryType;
        ++j;
        libraryName = *j;
      } else if (libraryName == "debug") {
        libType = DEBUG_LibraryType;
        ++j;
        libraryName = *j;
      }
      // This is equivalent to the target_link_libraries plain signature.
      target.AddLinkLibrary(*this, libraryName, libType);
      target.AppendProperty(
        "INTERFACE_LINK_LIBRARIES",
        target.GetDebugGeneratorExpressions(libraryName, libType).c_str());
    }
  }
}

void cmMakefile::AddAlias(const std::string& lname, std::string const& tgtName)
{
  this->AliasTargets[lname] = tgtName;
  this->GetGlobalGenerator()->AddAlias(lname, tgtName);
}

cmTarget* cmMakefile::AddLibrary(const std::string& lname,
                                 cmStateEnums::TargetType type,
                                 const std::vector<std::string>& srcs,
                                 bool excludeFromAll)
{
  assert(type == cmStateEnums::STATIC_LIBRARY ||
         type == cmStateEnums::SHARED_LIBRARY ||
         type == cmStateEnums::MODULE_LIBRARY ||
         type == cmStateEnums::OBJECT_LIBRARY ||
         type == cmStateEnums::INTERFACE_LIBRARY);

  cmTarget* target = this->AddNewTarget(type, lname);
  // Clear its dependencies. Otherwise, dependencies might persist
  // over changes in CMakeLists.txt, making the information stale and
  // hence useless.
  target->ClearDependencyInformation(*this);
  if (excludeFromAll) {
    target->SetProperty("EXCLUDE_FROM_ALL", "TRUE");
  }
  target->AddSources(srcs);
  this->AddGlobalLinkInformation(*target);
  return target;
}

cmTarget* cmMakefile::AddExecutable(const std::string& exeName,
                                    const std::vector<std::string>& srcs,
                                    bool excludeFromAll)
{
  cmTarget* target = this->AddNewTarget(cmStateEnums::EXECUTABLE, exeName);
  if (excludeFromAll) {
    target->SetProperty("EXCLUDE_FROM_ALL", "TRUE");
  }
  target->AddSources(srcs);
  this->AddGlobalLinkInformation(*target);
  return target;
}

cmTarget* cmMakefile::AddNewTarget(cmStateEnums::TargetType type,
                                   const std::string& name)
{
  cmTargets::iterator it =
    this->Targets
      .insert(cmTargets::value_type(
        name, cmTarget(name, type, cmTarget::VisibilityNormal, this)))
      .first;
  this->GetGlobalGenerator()->IndexTarget(&it->second);
  this->GetStateSnapshot().GetDirectory().AddNormalTargetName(name);
  return &it->second;
}

cmSourceFile* cmMakefile::LinearGetSourceFileWithOutput(
  const std::string& name) const
{
  std::string out;

  // look through all the source files that have custom commands
  // and see if the custom command has the passed source file as an output
  for (cmSourceFile* src : this->SourceFiles) {
    // does this source file have a custom command?
    if (src->GetCustomCommand()) {
      // Does the output of the custom command match the source file name?
      const std::vector<std::string>& outputs =
        src->GetCustomCommand()->GetOutputs();
      for (std::string const& output : outputs) {
        out = output;
        std::string::size_type pos = out.rfind(name);
        // If the output matches exactly
        if (pos != std::string::npos && pos == out.size() - name.size() &&
            (pos == 0 || out[pos - 1] == '/')) {
          return src;
        }
      }
    }
  }

  // otherwise return NULL
  return nullptr;
}

cmSourceFile* cmMakefile::GetSourceFileWithOutput(
  const std::string& name) const
{
  // If the queried path is not absolute we use the backward compatible
  // linear-time search for an output with a matching suffix.
  if (!cmSystemTools::FileIsFullPath(name)) {
    return this->LinearGetSourceFileWithOutput(name);
  }
  // Otherwise we use an efficient lookup map.
  OutputToSourceMap::const_iterator o = this->OutputToSource.find(name);
  if (o != this->OutputToSource.end()) {
    return (*o).second;
  }
  return nullptr;
}

#if defined(CMAKE_BUILD_WITH_CMAKE)
cmSourceGroup* cmMakefile::GetSourceGroup(
  const std::vector<std::string>& name) const
{
  cmSourceGroup* sg = nullptr;

  // first look for source group starting with the same as the one we want
  for (cmSourceGroup const& srcGroup : this->SourceGroups) {
    std::string const& sgName = srcGroup.GetName();
    if (sgName == name[0]) {
      sg = const_cast<cmSourceGroup*>(&srcGroup);
      break;
    }
  }

  if (sg != nullptr) {
    // iterate through its children to find match source group
    for (unsigned int i = 1; i < name.size(); ++i) {
      sg = sg->LookupChild(name[i]);
      if (sg == nullptr) {
        break;
      }
    }
  }
  return sg;
}

void cmMakefile::AddSourceGroup(const std::string& name, const char* regex)
{
  std::vector<std::string> nameVector;
  nameVector.push_back(name);
  this->AddSourceGroup(nameVector, regex);
}

void cmMakefile::AddSourceGroup(const std::vector<std::string>& name,
                                const char* regex)
{
  cmSourceGroup* sg = nullptr;
  std::vector<std::string> currentName;
  int i = 0;
  const int lastElement = static_cast<int>(name.size() - 1);
  for (i = lastElement; i >= 0; --i) {
    currentName.assign(name.begin(), name.begin() + i + 1);
    sg = this->GetSourceGroup(currentName);
    if (sg != nullptr) {
      break;
    }
  }

  // i now contains the index of the last found component
  if (i == lastElement) {
    // group already exists, replace its regular expression
    if (regex && sg) {
      // We only want to set the regular expression.  If there are already
      // source files in the group, we don't want to remove them.
      sg->SetGroupRegex(regex);
    }
    return;
  }
  if (i == -1) {
    // group does not exist nor belong to any existing group
    // add its first component
    this->SourceGroups.push_back(cmSourceGroup(name[0], regex));
    sg = this->GetSourceGroup(currentName);
    i = 0; // last component found
  }
  if (!sg) {
    cmSystemTools::Error("Could not create source group ");
    return;
  }
  // build the whole source group path
  for (++i; i <= lastElement; ++i) {
    sg->AddChild(cmSourceGroup(name[i], nullptr, sg->GetFullName().c_str()));
    sg = sg->LookupChild(name[i]);
  }

  sg->SetGroupRegex(regex);
}

cmSourceGroup* cmMakefile::GetOrCreateSourceGroup(
  const std::vector<std::string>& folders)
{
  cmSourceGroup* sg = this->GetSourceGroup(folders);
  if (sg == nullptr) {
    this->AddSourceGroup(folders);
    sg = this->GetSourceGroup(folders);
  }
  return sg;
}

cmSourceGroup* cmMakefile::GetOrCreateSourceGroup(const std::string& name)
{
  const char* delimiter = this->GetDefinition("SOURCE_GROUP_DELIMITER");
  if (delimiter == nullptr) {
    delimiter = "\\";
  }
  return this->GetOrCreateSourceGroup(
    cmSystemTools::tokenize(name, delimiter));
}

/**
 * Find a source group whose regular expression matches the filename
 * part of the given source name.  Search backward through the list of
 * source groups, and take the first matching group found.  This way
 * non-inherited SOURCE_GROUP commands will have precedence over
 * inherited ones.
 */
cmSourceGroup* cmMakefile::FindSourceGroup(
  const std::string& source, std::vector<cmSourceGroup>& groups) const
{
  // First search for a group that lists the file explicitly.
  for (std::vector<cmSourceGroup>::reverse_iterator sg = groups.rbegin();
       sg != groups.rend(); ++sg) {
    cmSourceGroup* result = sg->MatchChildrenFiles(source);
    if (result) {
      return result;
    }
  }

  // Now search for a group whose regex matches the file.
  for (std::vector<cmSourceGroup>::reverse_iterator sg = groups.rbegin();
       sg != groups.rend(); ++sg) {
    cmSourceGroup* result = sg->MatchChildrenRegex(source);
    if (result) {
      return result;
    }
  }

  // Shouldn't get here, but just in case, return the default group.
  return &groups.front();
}
#endif

static bool mightExpandVariablesCMP0019(const char* s)
{
  return s && *s && strstr(s, "${") && strchr(s, '}');
}

void cmMakefile::ExpandVariablesCMP0019()
{
  // Drop this ancient compatibility behavior with a policy.
  cmPolicies::PolicyStatus pol = this->GetPolicyStatus(cmPolicies::CMP0019);
  if (pol != cmPolicies::OLD && pol != cmPolicies::WARN) {
    return;
  }
  std::ostringstream w;

  const char* includeDirs = this->GetProperty("INCLUDE_DIRECTORIES");
  if (mightExpandVariablesCMP0019(includeDirs)) {
    std::string dirs = includeDirs;
    this->ExpandVariablesInString(dirs, true, true);
    if (pol == cmPolicies::WARN && dirs != includeDirs) {
      /* clang-format off */
      w << "Evaluated directory INCLUDE_DIRECTORIES\n"
        << "  " << includeDirs << "\n"
        << "as\n"
        << "  " << dirs << "\n";
      /* clang-format on */
    }
    this->SetProperty("INCLUDE_DIRECTORIES", dirs.c_str());
  }

  // Also for each target's INCLUDE_DIRECTORIES property:
  for (auto& target : this->Targets) {
    cmTarget& t = target.second;
    if (t.GetType() == cmStateEnums::INTERFACE_LIBRARY ||
        t.GetType() == cmStateEnums::GLOBAL_TARGET) {
      continue;
    }
    includeDirs = t.GetProperty("INCLUDE_DIRECTORIES");
    if (mightExpandVariablesCMP0019(includeDirs)) {
      std::string dirs = includeDirs;
      this->ExpandVariablesInString(dirs, true, true);
      if (pol == cmPolicies::WARN && dirs != includeDirs) {
        /* clang-format off */
        w << "Evaluated target " << t.GetName() << " INCLUDE_DIRECTORIES\n"
          << "  " << includeDirs << "\n"
          << "as\n"
          << "  " << dirs << "\n";
        /* clang-format on */
      }
      t.SetProperty("INCLUDE_DIRECTORIES", dirs.c_str());
    }
  }

  if (const char* linkDirsProp = this->GetProperty("LINK_DIRECTORIES")) {
    if (mightExpandVariablesCMP0019(linkDirsProp)) {
      std::string d = linkDirsProp;
      std::string orig = linkDirsProp;
      this->ExpandVariablesInString(d, true, true);
      if (pol == cmPolicies::WARN && d != orig) {
        /* clang-format off */
        w << "Evaluated link directories\n"
          << "  " << orig << "\n"
          << "as\n"
          << "  " << d << "\n";
        /* clang-format on */
      }
    }
  }

  if (const char* linkLibsProp = this->GetProperty("LINK_LIBRARIES")) {
    std::vector<std::string> linkLibs;
    cmSystemTools::ExpandListArgument(linkLibsProp, linkLibs);

    for (std::vector<std::string>::iterator l = linkLibs.begin();
         l != linkLibs.end(); ++l) {
      std::string libName = *l;
      if (libName == "optimized") {
        ++l;
        libName = *l;
      } else if (libName == "debug") {
        ++l;
        libName = *l;
      }
      if (mightExpandVariablesCMP0019(libName.c_str())) {
        std::string orig = libName;
        this->ExpandVariablesInString(libName, true, true);
        if (pol == cmPolicies::WARN && libName != orig) {
          /* clang-format off */
        w << "Evaluated link library\n"
          << "  " << orig << "\n"
          << "as\n"
          << "  " << libName << "\n";
          /* clang-format on */
        }
      }
    }
  }

  if (!w.str().empty()) {
    std::ostringstream m;
    /* clang-format off */
    m << cmPolicies::GetPolicyWarning(cmPolicies::CMP0019)
      << "\n"
      << "The following variable evaluations were encountered:\n"
      << w.str();
    /* clang-format on */
    this->GetCMakeInstance()->IssueMessage(cmake::AUTHOR_WARNING, m.str(),
                                           this->Backtrace);
  }
}

bool cmMakefile::IsOn(const std::string& name) const
{
  const char* value = this->GetDefinition(name);
  return cmSystemTools::IsOn(value);
}

bool cmMakefile::IsSet(const std::string& name) const
{
  const char* value = this->GetDefinition(name);
  if (!value) {
    return false;
  }

  if (!*value) {
    return false;
  }

  if (cmSystemTools::IsNOTFOUND(value)) {
    return false;
  }

  return true;
}

bool cmMakefile::PlatformIs32Bit() const
{
  if (const char* plat_abi =
        this->GetDefinition("CMAKE_INTERNAL_PLATFORM_ABI")) {
    if (strcmp(plat_abi, "ELF X32") == 0) {
      return false;
    }
  }
  if (const char* sizeof_dptr = this->GetDefinition("CMAKE_SIZEOF_VOID_P")) {
    return atoi(sizeof_dptr) == 4;
  }
  return false;
}

bool cmMakefile::PlatformIs64Bit() const
{
  if (const char* sizeof_dptr = this->GetDefinition("CMAKE_SIZEOF_VOID_P")) {
    return atoi(sizeof_dptr) == 8;
  }
  return false;
}

bool cmMakefile::PlatformIsx32() const
{
  if (const char* plat_abi =
        this->GetDefinition("CMAKE_INTERNAL_PLATFORM_ABI")) {
    if (strcmp(plat_abi, "ELF X32") == 0) {
      return true;
    }
  }
  return false;
}

cmMakefile::AppleSDK cmMakefile::GetAppleSDKType() const
{
  std::string sdkRoot;
  sdkRoot = this->GetSafeDefinition("CMAKE_OSX_SYSROOT");
  sdkRoot = cmSystemTools::LowerCase(sdkRoot);

  struct
  {
    std::string name;
    AppleSDK sdk;
  } const sdkDatabase[]{
    { "appletvos", AppleSDK::AppleTVOS },
    { "appletvsimulator", AppleSDK::AppleTVSimulator },
    { "iphoneos", AppleSDK::IPhoneOS },
    { "iphonesimulator", AppleSDK::IPhoneSimulator },
    { "watchos", AppleSDK::WatchOS },
    { "watchsimulator", AppleSDK::WatchSimulator },
  };

  for (auto entry : sdkDatabase) {
    if (sdkRoot.find(entry.name) == 0 ||
        sdkRoot.find(std::string("/") + entry.name) != std::string::npos) {
      return entry.sdk;
    }
  }

  return AppleSDK::MacOS;
}

bool cmMakefile::PlatformIsAppleEmbedded() const
{
  return GetAppleSDKType() != AppleSDK::MacOS;
}

const char* cmMakefile::GetSONameFlag(const std::string& language) const
{
  std::string name = "CMAKE_SHARED_LIBRARY_SONAME";
  if (!language.empty()) {
    name += "_";
    name += language;
  }
  name += "_FLAG";
  return GetDefinition(name);
}

bool cmMakefile::CanIWriteThisFile(std::string const& fileName) const
{
  if (!this->IsOn("CMAKE_DISABLE_SOURCE_CHANGES")) {
    return true;
  }
  // If we are doing an in-source build, then the test will always fail
  if (cmSystemTools::SameFile(this->GetHomeDirectory(),
                              this->GetHomeOutputDirectory())) {
    return !this->IsOn("CMAKE_DISABLE_IN_SOURCE_BUILD");
  }

  return !cmSystemTools::IsSubDirectory(fileName, this->GetHomeDirectory()) ||
    cmSystemTools::IsSubDirectory(fileName, this->GetHomeOutputDirectory()) ||
    cmSystemTools::SameFile(fileName, this->GetHomeOutputDirectory());
}

std::string cmMakefile::GetRequiredDefinition(const std::string& name) const
{
  const char* ret = this->GetDefinition(name);
  if (!ret) {
    cmSystemTools::Error("Error required internal CMake variable not "
                         "set, cmake may not be built correctly.\n",
                         "Missing variable is:\n", name.c_str());
    return std::string();
  }
  return std::string(ret);
}

bool cmMakefile::IsDefinitionSet(const std::string& name) const
{
  const std::string* def = this->StateSnapshot.GetDefinition(name);
  if (!def) {
    def = this->GetState()->GetInitializedCacheValue(name);
  }
#ifdef CMAKE_BUILD_WITH_CMAKE
  if (cmVariableWatch* vv = this->GetVariableWatch()) {
    if (!def) {
      vv->VariableAccessed(
        name, cmVariableWatch::UNKNOWN_VARIABLE_DEFINED_ACCESS, nullptr, this);
    }
  }
#endif
  return def != nullptr;
}

const std::string* cmMakefile::GetDef(const std::string& name) const
{
  const std::string* def = this->StateSnapshot.GetDefinition(name);
  if (!def) {
    def = this->GetState()->GetInitializedCacheValue(name);
  }
#ifdef CMAKE_BUILD_WITH_CMAKE
  cmVariableWatch* vv = this->GetVariableWatch();
  if (vv && !this->SuppressWatches) {
    bool const watch_function_executed =
      vv->VariableAccessed(name,
                           def ? cmVariableWatch::VARIABLE_READ_ACCESS
                               : cmVariableWatch::UNKNOWN_VARIABLE_READ_ACCESS,
                           (def ? def->c_str() : nullptr), this);

    if (watch_function_executed) {
      // A callback was executed and may have caused re-allocation of the
      // variable storage.  Look it up again for now.
      // FIXME: Refactor variable storage to avoid this problem.
      def = this->StateSnapshot.GetDefinition(name);
      if (!def) {
        def = this->GetState()->GetInitializedCacheValue(name);
      }
    }
  }
#endif
  return def;
}

const char* cmMakefile::GetDefinition(const std::string& name) const
{
  const std::string* def = GetDef(name);
  if (!def) {
    return nullptr;
  }
  return def->c_str();
}

const std::string& cmMakefile::GetSafeDefinition(const std::string& name) const
{
  static std::string const empty;
  const std::string* def = GetDef(name);
  if (!def) {
    return empty;
  }
  return *def;
}

std::vector<std::string> cmMakefile::GetDefinitions() const
{
  std::vector<std::string> res = this->StateSnapshot.ClosureKeys();
  std::vector<std::string> cacheKeys = this->GetState()->GetCacheEntryKeys();
  res.insert(res.end(), cacheKeys.begin(), cacheKeys.end());
  std::sort(res.begin(), res.end());
  return res;
}

const std::string& cmMakefile::ExpandVariablesInString(
  std::string& source) const
{
  return this->ExpandVariablesInString(source, false, false);
}

const std::string& cmMakefile::ExpandVariablesInString(
  std::string& source, bool escapeQuotes, bool noEscapes, bool atOnly,
  const char* filename, long line, bool removeEmpty, bool replaceAt) const
{
  bool compareResults = false;
  cmake::MessageType mtype = cmake::LOG;
  std::string errorstr;
  std::string original;

  // Sanity check the @ONLY mode.
  if (atOnly && (!noEscapes || !removeEmpty)) {
    // This case should never be called.  At-only is for
    // configure-file/string which always does no escapes.
    this->IssueMessage(cmake::INTERNAL_ERROR,
                       "ExpandVariablesInString @ONLY called "
                       "on something with escapes.");
    return source;
  }

  // Variables used in the WARN case.
  std::string newResult;
  std::string newErrorstr;
  cmake::MessageType newError = cmake::LOG;

  switch (this->GetPolicyStatus(cmPolicies::CMP0053)) {
    case cmPolicies::WARN: {
      // Save the original string for the warning.
      original = source;
      newResult = source;
      compareResults = true;
      // Suppress variable watches to avoid calling hooks twice. Suppress new
      // dereferences since the OLD behavior is still what is actually used.
      this->SuppressWatches = true;
      newError = ExpandVariablesInStringNew(
        newErrorstr, newResult, escapeQuotes, noEscapes, atOnly, filename,
        line, removeEmpty, replaceAt);
      this->SuppressWatches = false;
      CM_FALLTHROUGH;
    }
    case cmPolicies::OLD:
      mtype =
        ExpandVariablesInStringOld(errorstr, source, escapeQuotes, noEscapes,
                                   atOnly, filename, line, removeEmpty, true);
      break;
    case cmPolicies::REQUIRED_IF_USED:
    case cmPolicies::REQUIRED_ALWAYS:
    // Messaging here would be *very* verbose.
    case cmPolicies::NEW:
      mtype = ExpandVariablesInStringNew(errorstr, source, escapeQuotes,
                                         noEscapes, atOnly, filename, line,
                                         removeEmpty, replaceAt);
      break;
  }

  // If it's an error in either case, just report the error...
  if (mtype != cmake::LOG) {
    if (mtype == cmake::FATAL_ERROR) {
      cmSystemTools::SetFatalErrorOccured();
    }
    this->IssueMessage(mtype, errorstr);
  }
  // ...otherwise, see if there's a difference that needs to be warned about.
  else if (compareResults && (newResult != source || newError != mtype)) {
    std::string msg = cmPolicies::GetPolicyWarning(cmPolicies::CMP0053);
    msg += "\n";

    std::string msg_input = original;
    cmSystemTools::ReplaceString(msg_input, "\n", "\n  ");
    msg += "For input:\n  '";
    msg += msg_input;
    msg += "'\n";

    std::string msg_old = source;
    cmSystemTools::ReplaceString(msg_old, "\n", "\n  ");
    msg += "the old evaluation rules produce:\n  '";
    msg += msg_old;
    msg += "'\n";

    if (newError == mtype) {
      std::string msg_new = newResult;
      cmSystemTools::ReplaceString(msg_new, "\n", "\n  ");
      msg += "but the new evaluation rules produce:\n  '";
      msg += msg_new;
      msg += "'\n";
    } else {
      std::string msg_err = newErrorstr;
      cmSystemTools::ReplaceString(msg_err, "\n", "\n  ");
      msg += "but the new evaluation rules produce an error:\n  ";
      msg += msg_err;
      msg += "\n";
    }

    msg +=
      "Using the old result for compatibility since the policy is not set.";

    this->IssueMessage(cmake::AUTHOR_WARNING, msg);
  }

  return source;
}

cmake::MessageType cmMakefile::ExpandVariablesInStringOld(
  std::string& errorstr, std::string& source, bool escapeQuotes,
  bool noEscapes, bool atOnly, const char* filename, long line,
  bool removeEmpty, bool replaceAt) const
{
  // Fast path strings without any special characters.
  if (source.find_first_of("$@\\") == std::string::npos) {
    return cmake::LOG;
  }

  // Special-case the @ONLY mode.
  if (atOnly) {
    // Store an original copy of the input.
    std::string input = source;

    // Start with empty output.
    source.clear();