Source/cmGeneratorTarget.cxx

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

#include "cmsys/RegularExpression.hxx"
#include <algorithm>
#include <assert.h>
#include <errno.h>
#include <iterator>
#include <memory> // IWYU pragma: keep
#include <queue>
#include <sstream>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unordered_set>

#include "cmAlgorithms.h"
#include "cmComputeLinkInformation.h"
#include "cmCustomCommand.h"
#include "cmCustomCommandGenerator.h"
#include "cmCustomCommandLines.h"
#include "cmGeneratorExpression.h"
#include "cmGeneratorExpressionDAGChecker.h"
#include "cmGlobalGenerator.h"
#include "cmLocalGenerator.h"
#include "cmMakefile.h"
#include "cmPropertyMap.h"
#include "cmSourceFile.h"
#include "cmSourceFileLocation.h"
#include "cmState.h"
#include "cmSystemTools.h"
#include "cmTarget.h"
#include "cmTargetLinkLibraryType.h"
#include "cmTargetPropertyComputer.h"
#include "cmake.h"

class cmMessenger;

template <>
const char* cmTargetPropertyComputer::GetSources<cmGeneratorTarget>(
  cmGeneratorTarget const* tgt, cmMessenger* /* messenger */,
  cmListFileBacktrace const& /* context */)
{
  return tgt->GetSourcesProperty();
}

template <>
const char*
cmTargetPropertyComputer::ComputeLocationForBuild<cmGeneratorTarget>(
  cmGeneratorTarget const* tgt)
{
  return tgt->GetLocation("");
}

template <>
const char* cmTargetPropertyComputer::ComputeLocation<cmGeneratorTarget>(
  cmGeneratorTarget const* tgt, const std::string& config)
{
  return tgt->GetLocation(config);
}

class cmGeneratorTarget::TargetPropertyEntry
{
  static cmLinkImplItem NoLinkImplItem;

public:
  TargetPropertyEntry(std::unique_ptr<cmCompiledGeneratorExpression> cge,
                      cmLinkImplItem const& item = NoLinkImplItem)
    : ge(std::move(cge))
    , LinkImplItem(item)
  {
  }
  const std::unique_ptr<cmCompiledGeneratorExpression> ge;
  cmLinkImplItem const& LinkImplItem;
};
cmLinkImplItem cmGeneratorTarget::TargetPropertyEntry::NoLinkImplItem;

void CreatePropertyGeneratorExpressions(
  cmStringRange entries, cmBacktraceRange backtraces,
  std::vector<cmGeneratorTarget::TargetPropertyEntry*>& items,
  bool evaluateForBuildsystem = false)
{
  std::vector<cmListFileBacktrace>::const_iterator btIt = backtraces.begin();
  for (std::vector<std::string>::const_iterator it = entries.begin();
       it != entries.end(); ++it, ++btIt) {
    cmGeneratorExpression ge(*btIt);
    std::unique_ptr<cmCompiledGeneratorExpression> cge = ge.Parse(*it);
    cge->SetEvaluateForBuildsystem(evaluateForBuildsystem);
    items.push_back(
      new cmGeneratorTarget::TargetPropertyEntry(std::move(cge)));
  }
}

cmGeneratorTarget::cmGeneratorTarget(cmTarget* t, cmLocalGenerator* lg)
  : Target(t)
  , FortranModuleDirectoryCreated(false)
  , SourceFileFlagsConstructed(false)
  , PolicyWarnedCMP0022(false)
  , PolicyReportedCMP0069(false)
  , DebugIncludesDone(false)
  , DebugCompileOptionsDone(false)
  , DebugCompileFeaturesDone(false)
  , DebugCompileDefinitionsDone(false)
  , DebugLinkOptionsDone(false)
  , DebugLinkDirectoriesDone(false)
  , DebugSourcesDone(false)
  , LinkImplementationLanguageIsContextDependent(true)
  , UtilityItemsDone(false)
{
  this->Makefile = this->Target->GetMakefile();
  this->LocalGenerator = lg;
  this->GlobalGenerator = this->LocalGenerator->GetGlobalGenerator();

  this->GlobalGenerator->ComputeTargetObjectDirectory(this);

  CreatePropertyGeneratorExpressions(t->GetIncludeDirectoriesEntries(),
                                     t->GetIncludeDirectoriesBacktraces(),
                                     this->IncludeDirectoriesEntries);

  CreatePropertyGeneratorExpressions(t->GetCompileOptionsEntries(),
                                     t->GetCompileOptionsBacktraces(),
                                     this->CompileOptionsEntries);

  CreatePropertyGeneratorExpressions(t->GetCompileFeaturesEntries(),
                                     t->GetCompileFeaturesBacktraces(),
                                     this->CompileFeaturesEntries);

  CreatePropertyGeneratorExpressions(t->GetCompileDefinitionsEntries(),
                                     t->GetCompileDefinitionsBacktraces(),
                                     this->CompileDefinitionsEntries);

  CreatePropertyGeneratorExpressions(t->GetLinkOptionsEntries(),
                                     t->GetLinkOptionsBacktraces(),
                                     this->LinkOptionsEntries);

  CreatePropertyGeneratorExpressions(t->GetLinkDirectoriesEntries(),
                                     t->GetLinkDirectoriesBacktraces(),
                                     this->LinkDirectoriesEntries);

  CreatePropertyGeneratorExpressions(t->GetSourceEntries(),
                                     t->GetSourceBacktraces(),
                                     this->SourceEntries, true);

  this->DLLPlatform =
    !this->Makefile->GetSafeDefinition("CMAKE_IMPORT_LIBRARY_SUFFIX").empty();

  this->PolicyMap = t->PolicyMap;
}

cmGeneratorTarget::~cmGeneratorTarget()
{
  cmDeleteAll(this->IncludeDirectoriesEntries);
  cmDeleteAll(this->CompileOptionsEntries);
  cmDeleteAll(this->CompileFeaturesEntries);
  cmDeleteAll(this->CompileDefinitionsEntries);
  cmDeleteAll(this->LinkOptionsEntries);
  cmDeleteAll(this->LinkDirectoriesEntries);
  cmDeleteAll(this->SourceEntries);
  cmDeleteAll(this->LinkInformation);
}

const char* cmGeneratorTarget::GetSourcesProperty() const
{
  std::vector<std::string> values;
  for (TargetPropertyEntry* se : this->SourceEntries) {
    values.push_back(se->ge->GetInput());
  }
  static std::string value;
  value.clear();
  value = cmJoin(values, ";");
  return value.c_str();
}

cmGlobalGenerator* cmGeneratorTarget::GetGlobalGenerator() const
{
  return this->GetLocalGenerator()->GetGlobalGenerator();
}

cmLocalGenerator* cmGeneratorTarget::GetLocalGenerator() const
{
  return this->LocalGenerator;
}

cmStateEnums::TargetType cmGeneratorTarget::GetType() const
{
  return this->Target->GetType();
}

const std::string& cmGeneratorTarget::GetName() const
{
  return this->Target->GetName();
}

std::string cmGeneratorTarget::GetExportName() const
{
  const char* exportName = this->GetProperty("EXPORT_NAME");

  if (exportName && *exportName) {
    if (!cmGeneratorExpression::IsValidTargetName(exportName)) {
      std::ostringstream e;
      e << "EXPORT_NAME property \"" << exportName << "\" for \""
        << this->GetName() << "\": is not valid.";
      cmSystemTools::Error(e.str().c_str());
      return "";
    }
    return exportName;
  }
  return this->GetName();
}

const char* cmGeneratorTarget::GetProperty(const std::string& prop) const
{
  if (!cmTargetPropertyComputer::PassesWhitelist(
        this->GetType(), prop, this->Makefile->GetMessenger(),
        this->GetBacktrace())) {
    return nullptr;
  }
  if (const char* result = cmTargetPropertyComputer::GetProperty(
        this, prop, this->Makefile->GetMessenger(), this->GetBacktrace())) {
    return result;
  }
  if (cmSystemTools::GetFatalErrorOccured()) {
    return nullptr;
  }
  return this->Target->GetProperty(prop);
}

const char* cmGeneratorTarget::GetSafeProperty(const std::string& prop) const
{
  const char* ret = this->GetProperty(prop);
  if (!ret) {
    return "";
  }
  return ret;
}

const char* cmGeneratorTarget::GetOutputTargetType(
  cmStateEnums::ArtifactType artifact) const
{
  switch (this->GetType()) {
    case cmStateEnums::SHARED_LIBRARY:
      if (this->IsDLLPlatform()) {
        switch (artifact) {
          case cmStateEnums::RuntimeBinaryArtifact:
            // A DLL shared library is treated as a runtime target.
            return "RUNTIME";
          case cmStateEnums::ImportLibraryArtifact:
            // A DLL import library is treated as an archive target.
            return "ARCHIVE";
        }
      } else {
        // For non-DLL platforms shared libraries are treated as
        // library targets.
        return "LIBRARY";
      }
      break;
    case cmStateEnums::STATIC_LIBRARY:
      // Static libraries are always treated as archive targets.
      return "ARCHIVE";
    case cmStateEnums::MODULE_LIBRARY:
      switch (artifact) {
        case cmStateEnums::RuntimeBinaryArtifact:
          // Module libraries are always treated as library targets.
          return "LIBRARY";
        case cmStateEnums::ImportLibraryArtifact:
          // Module import libraries are treated as archive targets.
          return "ARCHIVE";
      }
      break;
    case cmStateEnums::OBJECT_LIBRARY:
      // Object libraries are always treated as object targets.
      return "OBJECT";
    case cmStateEnums::EXECUTABLE:
      switch (artifact) {
        case cmStateEnums::RuntimeBinaryArtifact:
          // Executables are always treated as runtime targets.
          return "RUNTIME";
        case cmStateEnums::ImportLibraryArtifact:
          // Executable import libraries are treated as archive targets.
          return "ARCHIVE";
      }
      break;
    default:
      break;
  }
  return "";
}

std::string cmGeneratorTarget::GetOutputName(
  const std::string& config, cmStateEnums::ArtifactType artifact) const
{
  // Lookup/compute/cache the output name for this configuration.
  OutputNameKey key(config, artifact);
  cmGeneratorTarget::OutputNameMapType::iterator i =
    this->OutputNameMap.find(key);
  if (i == this->OutputNameMap.end()) {
    // Add empty name in map to detect potential recursion.
    OutputNameMapType::value_type entry(key, "");
    i = this->OutputNameMap.insert(entry).first;

    // Compute output name.
    std::vector<std::string> props;
    std::string type = this->GetOutputTargetType(artifact);
    std::string configUpper = cmSystemTools::UpperCase(config);
    if (!type.empty() && !configUpper.empty()) {
      // <ARCHIVE|LIBRARY|RUNTIME>_OUTPUT_NAME_<CONFIG>
      props.push_back(type + "_OUTPUT_NAME_" + configUpper);
    }
    if (!type.empty()) {
      // <ARCHIVE|LIBRARY|RUNTIME>_OUTPUT_NAME
      props.push_back(type + "_OUTPUT_NAME");
    }
    if (!configUpper.empty()) {
      // OUTPUT_NAME_<CONFIG>
      props.push_back("OUTPUT_NAME_" + configUpper);
      // <CONFIG>_OUTPUT_NAME
      props.push_back(configUpper + "_OUTPUT_NAME");
    }
    // OUTPUT_NAME
    props.push_back("OUTPUT_NAME");

    std::string outName;
    for (std::string const& p : props) {
      if (const char* outNameProp = this->GetProperty(p)) {
        outName = outNameProp;
        break;
      }
    }

    if (outName.empty()) {
      outName = this->GetName();
    }

    // Now evaluate genex and update the previously-prepared map entry.
    cmGeneratorExpression ge;
    std::unique_ptr<cmCompiledGeneratorExpression> cge = ge.Parse(outName);
    i->second = cge->Evaluate(this->LocalGenerator, config);
  } else if (i->second.empty()) {
    // An empty map entry indicates we have been called recursively
    // from the above block.
    this->LocalGenerator->GetCMakeInstance()->IssueMessage(
      cmake::FATAL_ERROR,
      "Target '" + this->GetName() + "' OUTPUT_NAME depends on itself.",
      this->GetBacktrace());
  }
  return i->second;
}

void cmGeneratorTarget::ClearSourcesCache()
{
  this->KindedSourcesMap.clear();
  this->LinkImplementationLanguageIsContextDependent = true;
  this->Objects.clear();
}

void cmGeneratorTarget::AddSourceCommon(const std::string& src)
{
  cmListFileBacktrace lfbt = this->Makefile->GetBacktrace();
  cmGeneratorExpression ge(lfbt);
  std::unique_ptr<cmCompiledGeneratorExpression> cge = ge.Parse(src);
  cge->SetEvaluateForBuildsystem(true);
  this->SourceEntries.push_back(new TargetPropertyEntry(std::move(cge)));
  this->ClearSourcesCache();
}

void cmGeneratorTarget::AddSource(const std::string& src)
{
  this->Target->AddSource(src);
  this->AddSourceCommon(src);
}

void cmGeneratorTarget::AddTracedSources(std::vector<std::string> const& srcs)
{
  this->Target->AddTracedSources(srcs);
  if (!srcs.empty()) {
    this->AddSourceCommon(cmJoin(srcs, ";"));
  }
}

void cmGeneratorTarget::AddIncludeDirectory(const std::string& src,
                                            bool before)
{
  this->Target->InsertInclude(src, this->Makefile->GetBacktrace(), before);
  cmListFileBacktrace lfbt = this->Makefile->GetBacktrace();
  cmGeneratorExpression ge(lfbt);
  std::unique_ptr<cmCompiledGeneratorExpression> cge = ge.Parse(src);
  cge->SetEvaluateForBuildsystem(true);
  // Insert before begin/end
  std::vector<TargetPropertyEntry*>::iterator pos = before
    ? this->IncludeDirectoriesEntries.begin()
    : this->IncludeDirectoriesEntries.end();
  this->IncludeDirectoriesEntries.insert(
    pos, new TargetPropertyEntry(std::move(cge)));
}

std::vector<cmSourceFile*> const* cmGeneratorTarget::GetSourceDepends(
  cmSourceFile const* sf) const
{
  SourceEntriesType::const_iterator i = this->SourceDepends.find(sf);
  if (i != this->SourceDepends.end()) {
    return &i->second.Depends;
  }
  return nullptr;
}

static void handleSystemIncludesDep(
  cmLocalGenerator* lg, cmGeneratorTarget const* depTgt,
  const std::string& config, cmGeneratorTarget const* headTarget,
  cmGeneratorExpressionDAGChecker* dagChecker,
  std::vector<std::string>& result, bool excludeImported,
  std::string const& language)
{
  if (const char* dirs =
        depTgt->GetProperty("INTERFACE_SYSTEM_INCLUDE_DIRECTORIES")) {
    cmGeneratorExpression ge;
    cmSystemTools::ExpandListArgument(
      ge.Parse(dirs)->Evaluate(lg, config, false, headTarget, depTgt,
                               dagChecker, language),
      result);
  }
  if (!depTgt->IsImported() || excludeImported) {
    return;
  }

  if (const char* dirs =
        depTgt->GetProperty("INTERFACE_INCLUDE_DIRECTORIES")) {
    cmGeneratorExpression ge;
    cmSystemTools::ExpandListArgument(
      ge.Parse(dirs)->Evaluate(lg, config, false, headTarget, depTgt,
                               dagChecker, language),
      result);
  }
}

/* clang-format off */
#define IMPLEMENT_VISIT(KIND)                                                 \
  {                                                                           \
    KindedSources const& kinded = this->GetKindedSources(config);             \
    for (SourceAndKind const& s : kinded.Sources) {                           \
      if (s.Kind == KIND) {                                                   \
        data.push_back(s.Source);                                             \
      }                                                                       \
    }                                                                         \
  }
/* clang-format on */

void cmGeneratorTarget::GetObjectSources(
  std::vector<cmSourceFile const*>& data, const std::string& config) const
{
  IMPLEMENT_VISIT(SourceKindObjectSource);

  if (!this->Objects.empty()) {
    return;
  }

  for (cmSourceFile const* it : data) {
    this->Objects[it];
  }

  this->LocalGenerator->ComputeObjectFilenames(this->Objects, this);
}

void cmGeneratorTarget::ComputeObjectMapping()
{
  if (!this->Objects.empty()) {
    return;
  }

  std::vector<std::string> configs;
  this->Makefile->GetConfigurations(configs);
  if (configs.empty()) {
    configs.emplace_back();
  }
  for (std::string const& c : configs) {
    std::vector<cmSourceFile const*> sourceFiles;
    this->GetObjectSources(sourceFiles, c);
  }
}

const char* cmGeneratorTarget::GetFeature(const std::string& feature,
                                          const std::string& config) const
{
  if (!config.empty()) {
    std::string featureConfig = feature;
    featureConfig += "_";
    featureConfig += cmSystemTools::UpperCase(config);
    if (const char* value = this->GetProperty(featureConfig)) {
      return value;
    }
  }
  if (const char* value = this->GetProperty(feature)) {
    return value;
  }
  return this->LocalGenerator->GetFeature(feature, config);
}

bool cmGeneratorTarget::IsIPOEnabled(std::string const& lang,
                                     std::string const& config) const
{
  const char* feature = "INTERPROCEDURAL_OPTIMIZATION";
  const bool result = cmSystemTools::IsOn(this->GetFeature(feature, config));

  if (!result) {
    // 'INTERPROCEDURAL_OPTIMIZATION' is off, no need to check policies
    return false;
  }

  if (lang != "C" && lang != "CXX" && lang != "Fortran") {
    // We do not define IPO behavior for other languages.
    return false;
  }

  cmPolicies::PolicyStatus cmp0069 = this->GetPolicyStatusCMP0069();

  if (cmp0069 == cmPolicies::OLD || cmp0069 == cmPolicies::WARN) {
    if (this->Makefile->IsOn("_CMAKE_" + lang + "_IPO_LEGACY_BEHAVIOR")) {
      return true;
    }
    if (this->PolicyReportedCMP0069) {
      // problem is already reported, no need to issue a message
      return false;
    }
    const bool in_try_compile =
      this->LocalGenerator->GetCMakeInstance()->GetIsInTryCompile();
    if (cmp0069 == cmPolicies::WARN && !in_try_compile) {
      std::ostringstream w;
      w << cmPolicies::GetPolicyWarning(cmPolicies::CMP0069) << "\n";
      w << "INTERPROCEDURAL_OPTIMIZATION property will be ignored for target "
        << "'" << this->GetName() << "'.";
      this->LocalGenerator->GetCMakeInstance()->IssueMessage(
        cmake::AUTHOR_WARNING, w.str(), this->GetBacktrace());

      this->PolicyReportedCMP0069 = true;
    }
    return false;
  }

  // Note: check consistency with messages from CheckIPOSupported
  const char* message = nullptr;
  if (!this->Makefile->IsOn("_CMAKE_" + lang + "_IPO_SUPPORTED_BY_CMAKE")) {
    message = "CMake doesn't support IPO for current compiler";
  } else if (!this->Makefile->IsOn("_CMAKE_" + lang +
                                   "_IPO_MAY_BE_SUPPORTED_BY_COMPILER")) {
    message = "Compiler doesn't support IPO";
  } else if (!this->GlobalGenerator->IsIPOSupported()) {
    message = "CMake doesn't support IPO for current generator";
  }

  if (!message) {
    // No error/warning messages
    return true;
  }

  if (this->PolicyReportedCMP0069) {
    // problem is already reported, no need to issue a message
    return false;
  }

  this->PolicyReportedCMP0069 = true;

  this->LocalGenerator->GetCMakeInstance()->IssueMessage(
    cmake::FATAL_ERROR, message, this->GetBacktrace());
  return false;
}

const std::string& cmGeneratorTarget::GetObjectName(cmSourceFile const* file)
{
  this->ComputeObjectMapping();
  return this->Objects[file];
}

const char* cmGeneratorTarget::GetCustomObjectExtension() const
{
  static std::string extension;
  const bool has_ptx_extension =
    this->GetPropertyAsBool("CUDA_PTX_COMPILATION");
  if (has_ptx_extension) {
    extension = ".ptx";
    return extension.c_str();
  }
  return nullptr;
}

void cmGeneratorTarget::AddExplicitObjectName(cmSourceFile const* sf)
{
  this->ExplicitObjectName.insert(sf);
}

bool cmGeneratorTarget::HasExplicitObjectName(cmSourceFile const* file) const
{
  const_cast<cmGeneratorTarget*>(this)->ComputeObjectMapping();
  std::set<cmSourceFile const*>::const_iterator it =
    this->ExplicitObjectName.find(file);
  return it != this->ExplicitObjectName.end();
}

void cmGeneratorTarget::GetModuleDefinitionSources(
  std::vector<cmSourceFile const*>& data, const std::string& config) const
{
  IMPLEMENT_VISIT(SourceKindModuleDefinition);
}

void cmGeneratorTarget::GetHeaderSources(
  std::vector<cmSourceFile const*>& data, const std::string& config) const
{
  IMPLEMENT_VISIT(SourceKindHeader);
}

void cmGeneratorTarget::GetExtraSources(std::vector<cmSourceFile const*>& data,
                                        const std::string& config) const
{
  IMPLEMENT_VISIT(SourceKindExtra);
}

void cmGeneratorTarget::GetCustomCommands(
  std::vector<cmSourceFile const*>& data, const std::string& config) const
{
  IMPLEMENT_VISIT(SourceKindCustomCommand);
}

void cmGeneratorTarget::GetExternalObjects(
  std::vector<cmSourceFile const*>& data, const std::string& config) const
{
  IMPLEMENT_VISIT(SourceKindExternalObject);
}

void cmGeneratorTarget::GetExpectedResxHeaders(std::set<std::string>& headers,
                                               const std::string& config) const
{
  KindedSources const& kinded = this->GetKindedSources(config);
  headers = kinded.ExpectedResxHeaders;
}

void cmGeneratorTarget::GetResxSources(std::vector<cmSourceFile const*>& data,
                                       const std::string& config) const
{
  IMPLEMENT_VISIT(SourceKindResx);
}

void cmGeneratorTarget::GetAppManifest(std::vector<cmSourceFile const*>& data,
                                       const std::string& config) const
{
  IMPLEMENT_VISIT(SourceKindAppManifest);
}

void cmGeneratorTarget::GetManifests(std::vector<cmSourceFile const*>& data,
                                     const std::string& config) const
{
  IMPLEMENT_VISIT(SourceKindManifest);
}

void cmGeneratorTarget::GetCertificates(std::vector<cmSourceFile const*>& data,
                                        const std::string& config) const
{
  IMPLEMENT_VISIT(SourceKindCertificate);
}

void cmGeneratorTarget::GetExpectedXamlHeaders(std::set<std::string>& headers,
                                               const std::string& config) const
{
  KindedSources const& kinded = this->GetKindedSources(config);
  headers = kinded.ExpectedXamlHeaders;
}

void cmGeneratorTarget::GetExpectedXamlSources(std::set<std::string>& srcs,
                                               const std::string& config) const
{
  KindedSources const& kinded = this->GetKindedSources(config);
  srcs = kinded.ExpectedXamlSources;
}

std::set<cmLinkItem> const& cmGeneratorTarget::GetUtilityItems() const
{
  if (!this->UtilityItemsDone) {
    this->UtilityItemsDone = true;
    std::set<std::string> const& utilities = this->GetUtilities();
    for (std::string const& i : utilities) {
      if (cmGeneratorTarget* gt =
            this->LocalGenerator->FindGeneratorTargetToUse(i)) {
        this->UtilityItems.insert(cmLinkItem(gt));
      } else {
        this->UtilityItems.insert(cmLinkItem(i));
      }
    }
  }
  return this->UtilityItems;
}

void cmGeneratorTarget::GetXamlSources(std::vector<cmSourceFile const*>& data,
                                       const std::string& config) const
{
  IMPLEMENT_VISIT(SourceKindXaml);
}

const char* cmGeneratorTarget::GetLocation(const std::string& config) const
{
  static std::string location;
  if (this->IsImported()) {
    location = this->Target->ImportedGetFullPath(
      config, cmStateEnums::RuntimeBinaryArtifact);
  } else {
    location = this->GetFullPath(config, cmStateEnums::RuntimeBinaryArtifact);
  }
  return location.c_str();
}

std::vector<cmCustomCommand> const& cmGeneratorTarget::GetPreBuildCommands()
  const
{
  return this->Target->GetPreBuildCommands();
}

std::vector<cmCustomCommand> const& cmGeneratorTarget::GetPreLinkCommands()
  const
{
  return this->Target->GetPreLinkCommands();
}

std::vector<cmCustomCommand> const& cmGeneratorTarget::GetPostBuildCommands()
  const
{
  return this->Target->GetPostBuildCommands();
}

bool cmGeneratorTarget::IsImported() const
{
  return this->Target->IsImported();
}

bool cmGeneratorTarget::IsImportedGloballyVisible() const
{
  return this->Target->IsImportedGloballyVisible();
}

const char* cmGeneratorTarget::GetLocationForBuild() const
{
  static std::string location;
  if (this->IsImported()) {
    location = this->Target->ImportedGetFullPath(
      "", cmStateEnums::RuntimeBinaryArtifact);
    return location.c_str();
  }

  // Now handle the deprecated build-time configuration location.
  location = this->GetDirectory();
  const char* cfgid = this->Makefile->GetDefinition("CMAKE_CFG_INTDIR");
  if (cfgid && strcmp(cfgid, ".") != 0) {
    location += "/";
    location += cfgid;
  }

  if (this->IsAppBundleOnApple()) {
    std::string macdir = this->BuildBundleDirectory("", "", FullLevel);
    if (!macdir.empty()) {
      location += "/";
      location += macdir;
    }
  }
  location += "/";
  location += this->GetFullName("", cmStateEnums::RuntimeBinaryArtifact);
  return location.c_str();
}

bool cmGeneratorTarget::IsSystemIncludeDirectory(
  const std::string& dir, const std::string& config,
  const std::string& language) const
{
  assert(this->GetType() != cmStateEnums::INTERFACE_LIBRARY);
  std::string config_upper;
  if (!config.empty()) {
    config_upper = cmSystemTools::UpperCase(config);
  }

  typedef std::map<std::string, std::vector<std::string>> IncludeCacheType;
  IncludeCacheType::const_iterator iter =
    this->SystemIncludesCache.find(config_upper);

  if (iter == this->SystemIncludesCache.end()) {
    cmGeneratorExpressionDAGChecker dagChecker(
      this, "SYSTEM_INCLUDE_DIRECTORIES", nullptr, nullptr);

    bool excludeImported = this->GetPropertyAsBool("NO_SYSTEM_FROM_IMPORTED");

    std::vector<std::string> result;
    for (std::string const& it : this->Target->GetSystemIncludeDirectories()) {
      cmGeneratorExpression ge;
      cmSystemTools::ExpandListArgument(
        ge.Parse(it)->Evaluate(this->LocalGenerator, config, false, this,
                               &dagChecker, language),
        result);
    }

    std::vector<cmGeneratorTarget const*> const& deps =
      this->GetLinkImplementationClosure(config);
    for (cmGeneratorTarget const* dep : deps) {
      handleSystemIncludesDep(this->LocalGenerator, dep, config, this,
                              &dagChecker, result, excludeImported, language);
    }

    std::for_each(result.begin(), result.end(),
                  cmSystemTools::ConvertToUnixSlashes);
    std::sort(result.begin(), result.end());
    result.erase(std::unique(result.begin(), result.end()), result.end());

    IncludeCacheType::value_type entry(config_upper, result);
    iter = this->SystemIncludesCache.insert(entry).first;
  }

  return std::binary_search(iter->second.begin(), iter->second.end(), dir);
}

bool cmGeneratorTarget::GetPropertyAsBool(const std::string& prop) const
{
  return this->Target->GetPropertyAsBool(prop);
}

static void AddInterfaceEntries(
  cmGeneratorTarget const* thisTarget, std::string const& config,
  std::string const& prop,
  std::vector<cmGeneratorTarget::TargetPropertyEntry*>& entries)
{
  if (cmLinkImplementationLibraries const* impl =
        thisTarget->GetLinkImplementationLibraries(config)) {
    for (cmLinkImplItem const& lib : impl->Libraries) {
      if (lib.Target) {
        std::string uniqueName =
          thisTarget->GetGlobalGenerator()->IndexGeneratorTargetUniquely(
            lib.Target);
        std::string genex =
          "$<TARGET_PROPERTY:" + std::move(uniqueName) + "," + prop + ">";
        cmGeneratorExpression ge(lib.Backtrace);
        std::unique_ptr<cmCompiledGeneratorExpression> cge = ge.Parse(genex);
        cge->SetEvaluateForBuildsystem(true);
        entries.push_back(
          new cmGeneratorTarget::TargetPropertyEntry(std::move(cge), lib));
      }
    }
  }
}

static void AddObjectEntries(
  cmGeneratorTarget const* thisTarget, std::string const& config,
  std::vector<cmGeneratorTarget::TargetPropertyEntry*>& entries)
{
  if (cmLinkImplementationLibraries const* impl =
        thisTarget->GetLinkImplementationLibraries(config)) {
    for (cmLinkImplItem const& lib : impl->Libraries) {
      if (lib.Target &&
          lib.Target->GetType() == cmStateEnums::OBJECT_LIBRARY) {
        std::string uniqueName =
          thisTarget->GetGlobalGenerator()->IndexGeneratorTargetUniquely(
            lib.Target);
        std::string genex = "$<TARGET_OBJECTS:" + std::move(uniqueName) + ">";
        cmGeneratorExpression ge(lib.Backtrace);
        std::unique_ptr<cmCompiledGeneratorExpression> cge = ge.Parse(genex);
        cge->SetEvaluateForBuildsystem(true);
        entries.push_back(
          new cmGeneratorTarget::TargetPropertyEntry(std::move(cge), lib));
      }
    }
  }
}

static bool processSources(
  cmGeneratorTarget const* tgt,
  const std::vector<cmGeneratorTarget::TargetPropertyEntry*>& entries,
  std::vector<std::string>& srcs, std::unordered_set<std::string>& uniqueSrcs,
  cmGeneratorExpressionDAGChecker* dagChecker, std::string const& config,
  bool debugSources)
{
  cmMakefile* mf = tgt->Target->GetMakefile();

  bool contextDependent = false;

  for (cmGeneratorTarget::TargetPropertyEntry* entry : entries) {
    cmLinkImplItem const& item = entry->LinkImplItem;
    std::string const& targetName = item.AsStr();
    std::vector<std::string> entrySources;
    cmSystemTools::ExpandListArgument(
      entry->ge->Evaluate(tgt->GetLocalGenerator(), config, false, tgt, tgt,
                          dagChecker),
      entrySources);

    if (entry->ge->GetHadContextSensitiveCondition()) {
      contextDependent = true;
    }

    for (std::string& src : entrySources) {
      cmSourceFile* sf = mf->GetOrCreateSource(src);
      std::string e;
      std::string fullPath = sf->GetFullPath(&e);
      if (fullPath.empty()) {
        if (!e.empty()) {
          cmake* cm = tgt->GetLocalGenerator()->GetCMakeInstance();
          cm->IssueMessage(cmake::FATAL_ERROR, e, tgt->GetBacktrace());
        }
        return contextDependent;
      }

      if (!targetName.empty() && !cmSystemTools::FileIsFullPath(src)) {
        std::ostringstream err;
        if (!targetName.empty()) {
          err << "Target \"" << targetName
              << "\" contains relative path in its INTERFACE_SOURCES:\n  \""
              << src << "\"";
        } else {
          err << "Found relative path while evaluating sources of \""
              << tgt->GetName() << "\":\n  \"" << src << "\"\n";
        }
        tgt->GetLocalGenerator()->IssueMessage(cmake::FATAL_ERROR, err.str());
        return contextDependent;
      }
      src = fullPath;
    }
    std::string usedSources;
    for (std::string const& src : entrySources) {
      if (uniqueSrcs.insert(src).second) {
        srcs.push_back(src);
        if (debugSources) {
          usedSources += " * " + src + "\n";
        }
      }
    }
    if (!usedSources.empty()) {
      tgt->GetLocalGenerator()->GetCMakeInstance()->IssueMessage(
        cmake::LOG,
        std::string("Used sources for target ") + tgt->GetName() + ":\n" +
          usedSources,
        entry->ge->GetBacktrace());
    }
  }
  return contextDependent;
}

void cmGeneratorTarget::GetSourceFiles(std::vector<std::string>& files,
                                       const std::string& config) const
{
  assert(this->GetType() != cmStateEnums::INTERFACE_LIBRARY);

  if (!this->LocalGenerator->GetGlobalGenerator()->GetConfigureDoneCMP0026()) {
    // At configure-time, this method can be called as part of getting the
    // LOCATION property or to export() a file to be include()d.  However
    // there is no cmGeneratorTarget at configure-time, so search the SOURCES
    // for TARGET_OBJECTS instead for backwards compatibility with OLD
    // behavior of CMP0024 and CMP0026 only.

    cmStringRange sourceEntries = this->Target->GetSourceEntries();
    for (std::string const& entry : sourceEntries) {
      std::vector<std::string> items;
      cmSystemTools::ExpandListArgument(entry, items);
      for (std::string const& item : items) {
        if (cmHasLiteralPrefix(item, "$<TARGET_OBJECTS:") &&
            item[item.size() - 1] == '>') {
          continue;
        }
        files.push_back(item);
      }
    }
    return;
  }

  std::vector<std::string> debugProperties;
  const char* debugProp =
    this->Makefile->GetDefinition("CMAKE_DEBUG_TARGET_PROPERTIES");
  if (debugProp) {
    cmSystemTools::ExpandListArgument(debugProp, debugProperties);
  }

  bool debugSources = !this->DebugSourcesDone &&
    std::find(debugProperties.begin(), debugProperties.end(), "SOURCES") !=
      debugProperties.end();

  if (this->LocalGenerator->GetGlobalGenerator()->GetConfigureDoneCMP0026()) {
    this->DebugSourcesDone = true;
  }

  cmGeneratorExpressionDAGChecker dagChecker(this, "SOURCES", nullptr,
                                             nullptr);

  std::unordered_set<std::string> uniqueSrcs;
  bool contextDependentDirectSources =
    processSources(this, this->SourceEntries, files, uniqueSrcs, &dagChecker,
                   config, debugSources);

  // Collect INTERFACE_SOURCES of all direct link-dependencies.
  std::vector<cmGeneratorTarget::TargetPropertyEntry*>
    linkInterfaceSourcesEntries;
  AddInterfaceEntries(this, config, "INTERFACE_SOURCES",
                      linkInterfaceSourcesEntries);
  std::vector<std::string>::size_type numFilesBefore = files.size();
  bool contextDependentInterfaceSources =
    processSources(this, linkInterfaceSourcesEntries, files, uniqueSrcs,
                   &dagChecker, config, debugSources);

  // Collect TARGET_OBJECTS of direct object link-dependencies.
  std::vector<cmGeneratorTarget::TargetPropertyEntry*> linkObjectsEntries;
  AddObjectEntries(this, config, linkObjectsEntries);
  std::vector<std::string>::size_type numFilesBefore2 = files.size();
  bool contextDependentObjects =
    processSources(this, linkObjectsEntries, files, uniqueSrcs, &dagChecker,
                   config, debugSources);

  if (!contextDependentDirectSources &&
      !(contextDependentInterfaceSources && numFilesBefore < files.size()) &&
      !(contextDependentObjects && numFilesBefore2 < files.size())) {
    this->LinkImplementationLanguageIsContextDependent = false;
  }

  cmDeleteAll(linkInterfaceSourcesEntries);
  cmDeleteAll(linkObjectsEntries);
}

void cmGeneratorTarget::GetSourceFiles(std::vector<cmSourceFile*>& files,
                                       const std::string& config) const
{
  if (!this->GlobalGenerator->GetConfigureDoneCMP0026()) {
    // Since we are still configuring not all sources may exist yet,
    // so we need to avoid full source classification because that
    // requires the absolute paths to all sources to be determined.
    // Since this is only for compatibility with old policies that
    // projects should not depend on anymore, just compute the files
    // without memoizing them.
    std::vector<std::string> srcs;
    this->GetSourceFiles(srcs, config);
    std::set<cmSourceFile*> emitted;
    for (std::string const& s : srcs) {
      cmSourceFile* sf = this->Makefile->GetOrCreateSource(s);
      if (emitted.insert(sf).second) {
        files.push_back(sf);
      }
    }
    return;
  }

  KindedSources const& kinded = this->GetKindedSources(config);
  files.reserve(kinded.Sources.size());
  for (SourceAndKind const& si : kinded.Sources) {
    files.push_back(si.Source);
  }
}

void cmGeneratorTarget::GetSourceFilesWithoutObjectLibraries(
  std::vector<cmSourceFile*>& files, const std::string& config) const
{
  KindedSources const& kinded = this->GetKindedSources(config);
  files.reserve(kinded.Sources.size());
  for (SourceAndKind const& si : kinded.Sources) {
    if (si.Source->GetObjectLibrary().empty()) {
      files.push_back(si.Source);
    }
  }
}

cmGeneratorTarget::KindedSources const& cmGeneratorTarget::GetKindedSources(
  std::string const& config) const
{
  // If we already processed one configuration and found no dependenc
  // on configuration then always use the one result.
  if (!this->LinkImplementationLanguageIsContextDependent) {
    return this->KindedSourcesMap.begin()->second;
  }

  // Lookup any existing link implementation for this configuration.
  std::string const key = cmSystemTools::UpperCase(config);
  KindedSourcesMapType::iterator it = this->KindedSourcesMap.find(key);
  if (it != this->KindedSourcesMap.end()) {
    if (!it->second.Initialized) {
      std::ostringstream e;
      e << "The SOURCES of \"" << this->GetName()
        << "\" use a generator expression that depends on the "
           "SOURCES themselves.";
      this->GlobalGenerator->GetCMakeInstance()->IssueMessage(
        cmake::FATAL_ERROR, e.str(), this->GetBacktrace());
      static KindedSources empty;
      return empty;
    }
    return it->second;
  }

  // Add an entry to the map for this configuration.
  KindedSources& files = this->KindedSourcesMap[key];
  this->ComputeKindedSources(files, config);
  files.Initialized = true;
  return files;
}

void cmGeneratorTarget::ComputeKindedSources(KindedSources& files,
                                             std::string const& config) const
{
  // Get the source file paths by string.
  std::vector<std::string> srcs;
  this->GetSourceFiles(srcs, config);

  cmsys::RegularExpression header_regex(CM_HEADER_REGEX);
  std::vector<cmSourceFile*> badObjLib;

  std::set<cmSourceFile*> emitted;
  for (std::string const& s : srcs) {
    // Create each source at most once.
    cmSourceFile* sf = this->Makefile->GetOrCreateSource(s);
    if (!emitted.insert(sf).second) {
      continue;
    }

    // Compute the kind (classification) of this source file.
    SourceKind kind;
    std::string ext = cmSystemTools::LowerCase(sf->GetExtension());
    if (sf->GetCustomCommand()) {
      kind = SourceKindCustomCommand;
    } else if (this->Target->GetType() == cmStateEnums::UTILITY) {
      kind = SourceKindExtra;
    } else if (sf->GetPropertyAsBool("HEADER_FILE_ONLY")) {
      kind = SourceKindHeader;
    } else if (sf->GetPropertyAsBool("EXTERNAL_OBJECT")) {
      kind = SourceKindExternalObject;
    } else if (!sf->GetLanguage().empty()) {
      kind = SourceKindObjectSource;
    } else if (ext == "def") {
      kind = SourceKindModuleDefinition;
      if (this->GetType() == cmStateEnums::OBJECT_LIBRARY) {
        badObjLib.push_back(sf);
      }
    } else if (ext == "idl") {
      kind = SourceKindIDL;
      if (this->GetType() == cmStateEnums::OBJECT_LIBRARY) {
        badObjLib.push_back(sf);
      }
    } else if (ext == "resx") {
      kind = SourceKindResx;
      // Build and save the name of the corresponding .h file
      // This relationship will be used later when building the project files.
      // Both names would have been auto generated from Visual Studio
      // where the user supplied the file name and Visual Studio
      // appended the suffix.
      std::string resx = sf->GetFullPath();
      std::string hFileName = resx.substr(0, resx.find_last_of('.')) + ".h";
      files.ExpectedResxHeaders.insert(hFileName);
    } else if (ext == "appxmanifest") {
      kind = SourceKindAppManifest;
    } else if (ext == "manifest") {
      kind = SourceKindManifest;
    } else if (ext == "pfx") {
      kind = SourceKindCertificate;
    } else if (ext == "xaml") {
      kind = SourceKindXaml;
      // Build and save the name of the corresponding .h and .cpp file
      // This relationship will be used later when building the project files.
      // Both names would have been auto generated from Visual Studio
      // where the user supplied the file name and Visual Studio
      // appended the suffix.
      std::string xaml = sf->GetFullPath();
      std::string hFileName = xaml + ".h";
      std::string cppFileName = xaml + ".cpp";
      files.ExpectedXamlHeaders.insert(hFileName);
      files.ExpectedXamlSources.insert(cppFileName);
    } else if (header_regex.find(sf->GetFullPath())) {
      kind = SourceKindHeader;
    } else {
      kind = SourceKindExtra;
    }

    // Save this classified source file in the result vector.
    files.Sources.push_back({ sf, kind });
  }

  if (!badObjLib.empty()) {
    std::ostringstream e;
    e << "OBJECT library \"" << this->GetName() << "\" contains:\n";
    for (cmSourceFile* i : badObjLib) {
      e << "  " << i->GetLocation().GetName() << "\n";
    }
    e << "but may contain only sources that compile, header files, and "
         "other files that would not affect linking of a normal library.";
    this->GlobalGenerator->GetCMakeInstance()->IssueMessage(
      cmake::FATAL_ERROR, e.str(), this->GetBacktrace());
  }
}

std::vector<cmGeneratorTarget::AllConfigSource> const&
cmGeneratorTarget::GetAllConfigSources() const
{
  if (this->AllConfigSources.empty()) {
    this->ComputeAllConfigSources();
  }
  return this->AllConfigSources;
}

void cmGeneratorTarget::ComputeAllConfigSources() const
{
  std::vector<std::string> configs;
  this->Makefile->GetConfigurations(configs);

  std::map<cmSourceFile const*, size_t> index;

  for (size_t ci = 0; ci < configs.size(); ++ci) {
    KindedSources const& sources = this->GetKindedSources(configs[ci]);
    for (SourceAndKind const& src : sources.Sources) {
      std::map<cmSourceFile const*, size_t>::iterator mi =
        index.find(src.Source);
      if (mi == index.end()) {
        AllConfigSource acs;
        acs.Source = src.Source;
        acs.Kind = src.Kind;
        this->AllConfigSources.push_back(std::move(acs));
        std::map<cmSourceFile const*, size_t>::value_type entry(
          src.Source, this->AllConfigSources.size() - 1);
        mi = index.insert(entry).first;
      }
      this->AllConfigSources[mi->second].Configs.push_back(ci);
    }
  }
}

std::string cmGeneratorTarget::GetCompilePDBName(
  const std::string& config) const
{
  std::string prefix;
  std::string base;
  std::string suffix;
  this->GetFullNameInternal(config, cmStateEnums::RuntimeBinaryArtifact,
                            prefix, base, suffix);

  // Check for a per-configuration output directory target property.
  std::string configUpper = cmSystemTools::UpperCase(config);
  std::string configProp = "COMPILE_PDB_NAME_";
  configProp += configUpper;
  const char* config_name = this->GetProperty(configProp);
  if (config_name && *config_name) {
    return prefix + config_name + ".pdb";
  }

  const char* name = this->GetProperty("COMPILE_PDB_NAME");
  if (name && *name) {
    return prefix + name + ".pdb";
  }

  return "";
}

std::string cmGeneratorTarget::GetCompilePDBPath(
  const std::string& config) const
{
  std::string dir = this->GetCompilePDBDirectory(config);
  std::string name = this->GetCompilePDBName(config);
  if (dir.empty() && !name.empty() && this->HaveWellDefinedOutputFiles()) {
    dir = this->GetPDBDirectory(config);
  }
  if (!dir.empty()) {
    dir += "/";
  }
  return dir + name;
}

bool cmGeneratorTarget::HasSOName(const std::string& config) const
{
  // soname is supported only for shared libraries and modules,
  // and then only when the platform supports an soname flag.
  return ((this->GetType() == cmStateEnums::SHARED_LIBRARY) &&
          !this->GetPropertyAsBool("NO_SONAME") &&
          this->Makefile->GetSONameFlag(this->GetLinkerLanguage(config)));
}

bool cmGeneratorTarget::NeedRelinkBeforeInstall(
  const std::string& config) const
{
  // Only executables and shared libraries can have an rpath and may
  // need relinking.
  if (this->GetType() != cmStateEnums::EXECUTABLE &&
      this->GetType() != cmStateEnums::SHARED_LIBRARY &&
      this->GetType() != cmStateEnums::MODULE_LIBRARY) {
    return false;
  }

  // If there is no install location this target will not be installed
  // and therefore does not need relinking.
  if (!this->Target->GetHaveInstallRule()) {
    return false;
  }

  // If skipping all rpaths completely then no relinking is needed.
  if (this->Makefile->IsOn("CMAKE_SKIP_RPATH")) {
    return false;
  }

  // If building with the install-tree rpath no relinking is needed.
  if (this->GetPropertyAsBool("BUILD_WITH_INSTALL_RPATH")) {
    return false;
  }

  // If chrpath is going to be used no relinking is needed.
  if (this->IsChrpathUsed(config)) {
    return false;
  }

  // Check for rpath support on this platform.
  std::string ll = this->GetLinkerLanguage(config);
  if (!ll.empty()) {
    std::string flagVar = "CMAKE_SHARED_LIBRARY_RUNTIME_";
    flagVar += ll;
    flagVar += "_FLAG";
    if (!this->Makefile->IsSet(flagVar)) {
      // There is no rpath support on this platform so nothing needs
      // relinking.
      return false;
    }
  } else {
    // No linker language is known.  This error will be reported by
    // other code.
    return false;
  }

  // If either a build or install tree rpath is set then the rpath
  // will likely change between the build tree and install tree and
  // this target must be relinked.
  bool have_rpath =
    this->HaveBuildTreeRPATH(config) || this->HaveInstallTreeRPATH();
  bool is_ninja =
    this->LocalGenerator->GetGlobalGenerator()->GetName() == "Ninja";

  if (have_rpath && is_ninja) {
    std::ostringstream w;
    /* clang-format off */
    w <<
      "The install of the " << this->GetName() << " target requires "
      "changing an RPATH from the build tree, but this is not supported "
      "with the Ninja generator unless on an ELF-based platform.  The "
      "CMAKE_BUILD_WITH_INSTALL_RPATH variable may be set to avoid this "
      "relinking step."
      ;
    /* clang-format on */

    cmake* cm = this->LocalGenerator->GetCMakeInstance();
    cm->IssueMessage(cmake::FATAL_ERROR, w.str(), this->GetBacktrace());
  }

  return have_rpath;
}

bool cmGeneratorTarget::IsChrpathUsed(const std::string& config) const
{
  // Only certain target types have an rpath.
  if (!(this->GetType() == cmStateEnums::SHARED_LIBRARY ||
        this->GetType() == cmStateEnums::MODULE_LIBRARY ||
        this->GetType() == cmStateEnums::EXECUTABLE)) {
    return false;
  }

  // If the target will not be installed we do not need to change its
  // rpath.
  if (!this->Target->GetHaveInstallRule()) {
    return false;
  }

  // Skip chrpath if skipping rpath altogether.
  if (this->Makefile->IsOn("CMAKE_SKIP_RPATH")) {
    return false;
  }

  // Skip chrpath if it does not need to be changed at install time.
  if (this->GetPropertyAsBool("BUILD_WITH_INSTALL_RPATH")) {
    return false;
  }

  // Allow the user to disable builtin chrpath explicitly.
  if (this->Makefile->IsOn("CMAKE_NO_BUILTIN_CHRPATH")) {
    return false;
  }

  if (this->Makefile->IsOn("CMAKE_PLATFORM_HAS_INSTALLNAME")) {
    return true;
  }

#if defined(CMAKE_USE_ELF_PARSER)
  // Enable if the rpath flag uses a separator and the target uses ELF
  // binaries.
  std::string ll = this->GetLinkerLanguage(config);
  if (!ll.empty()) {
    std::string sepVar = "CMAKE_SHARED_LIBRARY_RUNTIME_";
    sepVar += ll;
    sepVar += "_FLAG_SEP";
    const char* sep = this->Makefile->GetDefinition(sepVar);
    if (sep && *sep) {
      // TODO: Add ELF check to ABI detection and get rid of
      // CMAKE_EXECUTABLE_FORMAT.
      if (const char* fmt =
            this->Makefile->GetDefinition("CMAKE_EXECUTABLE_FORMAT")) {
        return strcmp(fmt, "ELF") == 0;
      }
    }
  }
#endif
  static_cast<void>(config);
  return false;
}

bool cmGeneratorTarget::IsImportedSharedLibWithoutSOName(
  const std::string& config) const
{
  if (this->IsImported() && this->GetType() == cmStateEnums::SHARED_LIBRARY) {
    if (cmGeneratorTarget::ImportInfo const* info =
          this->GetImportInfo(config)) {
      return info->NoSOName;
    }
  }
  return false;
}

bool cmGeneratorTarget::HasMacOSXRpathInstallNameDir(
  const std::string& config) const
{
  bool install_name_is_rpath = false;
  bool macosx_rpath = false;

  if (!this->IsImported()) {
    if (this->GetType() != cmStateEnums::SHARED_LIBRARY) {
      return false;
    }
    const char* install_name = this->GetProperty("INSTALL_NAME_DIR");
    bool use_install_name = this->MacOSXUseInstallNameDir();
    if (install_name && use_install_name &&
        std::string(install_name) == "@rpath") {
      install_name_is_rpath = true;
    } else if (install_name && use_install_name) {
      return false;
    }
    if (!install_name_is_rpath) {
      macosx_rpath = this->MacOSXRpathInstallNameDirDefault();
    }
  } else {
    // Lookup the imported soname.
    if (cmGeneratorTarget::ImportInfo const* info =
          this->GetImportInfo(config)) {
      if (!info->NoSOName && !info->SOName.empty()) {
        if (info->SOName.find("@rpath/") == 0) {
          install_name_is_rpath = true;
        }
      } else {
        std::string install_name;
        cmSystemTools::GuessLibraryInstallName(info->Location, install_name);
        if (install_name.find("@rpath") != std::string::npos) {
          install_name_is_rpath = true;
        }
      }
    }
  }

  if (!install_name_is_rpath && !macosx_rpath) {
    return false;
  }

  if (!this->Makefile->IsSet("CMAKE_SHARED_LIBRARY_RUNTIME_C_FLAG")) {
    std::ostringstream w;
    w << "Attempting to use ";
    if (macosx_rpath) {
      w << "MACOSX_RPATH";
    } else {
      w << "@rpath";
    }
    w << " without CMAKE_SHARED_LIBRARY_RUNTIME_C_FLAG being set.";
    w << "  This could be because you are using a Mac OS X version";
    w << " less than 10.5 or because CMake's platform configuration is";
    w << " corrupt.";
    cmake* cm = this->LocalGenerator->GetCMakeInstance();
    cm->IssueMessage(cmake::FATAL_ERROR, w.str(), this->GetBacktrace());
  }

  return true;
}

bool cmGeneratorTarget::MacOSXRpathInstallNameDirDefault() const
{
  // we can't do rpaths when unsupported
  if (!this->Makefile->IsSet("CMAKE_SHARED_LIBRARY_RUNTIME_C_FLAG")) {
    return false;
  }

  const char* macosx_rpath_str = this->GetProperty("MACOSX_RPATH");
  if (macosx_rpath_str) {
    return this->GetPropertyAsBool("MACOSX_RPATH");
  }

  cmPolicies::PolicyStatus cmp0042 = this->GetPolicyStatusCMP0042();

  if (cmp0042 == cmPolicies::WARN) {
    this->LocalGenerator->GetGlobalGenerator()->AddCMP0042WarnTarget(
      this->GetName());
  }

  return cmp0042 == cmPolicies::NEW;
}

bool cmGeneratorTarget::MacOSXUseInstallNameDir() const
{
  const char* build_with_install_name =
    this->GetProperty("BUILD_WITH_INSTALL_NAME_DIR");
  if (build_with_install_name) {
    return cmSystemTools::IsOn(build_with_install_name);
  }

  cmPolicies::PolicyStatus cmp0068 = this->GetPolicyStatusCMP0068();
  if (cmp0068 == cmPolicies::NEW) {
    return false;
  }

  bool use_install_name = this->GetPropertyAsBool("BUILD_WITH_INSTALL_RPATH");

  if (use_install_name && cmp0068 == cmPolicies::WARN) {
    this->LocalGenerator->GetGlobalGenerator()->AddCMP0068WarnTarget(
      this->GetName());
  }

  return use_install_name;
}

bool cmGeneratorTarget::CanGenerateInstallNameDir(
  InstallNameType name_type) const
{
  cmPolicies::PolicyStatus cmp0068 = this->GetPolicyStatusCMP0068();

  if (cmp0068 == cmPolicies::NEW) {
    return true;
  }

  bool skip = this->Makefile->IsOn("CMAKE_SKIP_RPATH");
  if (name_type == INSTALL_NAME_FOR_INSTALL) {
    skip |= this->Makefile->IsOn("CMAKE_SKIP_INSTALL_RPATH");
  } else {
    skip |= this->GetPropertyAsBool("SKIP_BUILD_RPATH");
  }

  if (skip && cmp0068 == cmPolicies::WARN) {
    this->LocalGenerator->GetGlobalGenerator()->AddCMP0068WarnTarget(
      this->GetName());
  }

  return !skip;
}

std::string cmGeneratorTarget::GetSOName(const std::string& config) const
{
  if (this->IsImported()) {
    // Lookup the imported soname.
    if (cmGeneratorTarget::ImportInfo const* info =
          this->GetImportInfo(config)) {
      if (info->NoSOName) {
        // The imported library has no builtin soname so the name
        // searched at runtime will be just the filename.
        return cmSystemTools::GetFilenameName(info->Location);
      }
      // Use the soname given if any.
      if (info->SOName.find("@rpath/") == 0) {
        return info->SOName.substr(6);
      }
      return info->SOName;
    }
    return "";
  }
  // Compute the soname that will be built.
  std::string name;
  std::string soName;
  std::string realName;
  std::string impName;
  std::string pdbName;
  this->GetLibraryNames(name, soName, realName, impName, pdbName, config);
  return soName;
}

static bool shouldAddFullLevel(cmGeneratorTarget::BundleDirectoryLevel level)
{
  return level == cmGeneratorTarget::FullLevel;
}

static bool shouldAddContentLevel(
  cmGeneratorTarget::BundleDirectoryLevel level)
{
  return level == cmGeneratorTarget::ContentLevel || shouldAddFullLevel(level);
}

std::string cmGeneratorTarget::GetAppBundleDirectory(
  const std::string& config, BundleDirectoryLevel level) const
{
  std::string fpath =
    this->GetFullName(config, cmStateEnums::RuntimeBinaryArtifact);
  fpath += ".";
  const char* ext = this->GetProperty("BUNDLE_EXTENSION");
  if (!ext) {
    ext = "app";
  }
  fpath += ext;
  if (shouldAddContentLevel(level) &&
      !this->Makefile->PlatformIsAppleEmbedded()) {
    fpath += "/Contents";
    if (shouldAddFullLevel(level)) {
      fpath += "/MacOS";
    }
  }
  return fpath;
}

bool cmGeneratorTarget::IsBundleOnApple() const
{
  return this->IsFrameworkOnApple() || this->IsAppBundleOnApple() ||
    this->IsCFBundleOnApple();
}

std::string cmGeneratorTarget::GetCFBundleDirectory(
  const std::string& config, BundleDirectoryLevel level) const
{
  std::string fpath;
  fpath += this->GetOutputName(config, cmStateEnums::RuntimeBinaryArtifact);
  fpath += ".";
  const char* ext = this->GetProperty("BUNDLE_EXTENSION");
  if (!ext) {
    if (this->IsXCTestOnApple()) {
      ext = "xctest";
    } else {
      ext = "bundle";
    }
  }
  fpath += ext;
  if (shouldAddContentLevel(level) &&
      !this->Makefile->PlatformIsAppleEmbedded()) {
    fpath += "/Contents";
    if (shouldAddFullLevel(level)) {
      fpath += "/MacOS";
    }
  }
  return fpath;
}

std::string cmGeneratorTarget::GetFrameworkDirectory(
  const std::string& config, BundleDirectoryLevel level) const
{
  std::string fpath;
  fpath += this->GetOutputName(config, cmStateEnums::RuntimeBinaryArtifact);
  fpath += ".";
  const char* ext = this->GetProperty("BUNDLE_EXTENSION");
  if (!ext) {
    ext = "framework";
  }
  fpath += ext;
  if (shouldAddFullLevel(level) &&
      !this->Makefile->PlatformIsAppleEmbedded()) {
    fpath += "/Versions/";
    fpath += this->GetFrameworkVersion();
  }
  return fpath;
}

std::string cmGeneratorTarget::GetFullName(
  const std::string& config, cmStateEnums::ArtifactType artifact) const
{
  if (this->IsImported()) {
    return this->GetFullNameImported(config, artifact);
  }
  return this->GetFullNameInternal(config, artifact);
}

std::string cmGeneratorTarget::GetInstallNameDirForBuildTree(
  const std::string& config) const
{
  if (this->Makefile->IsOn("CMAKE_PLATFORM_HAS_INSTALLNAME")) {

    // If building directly for installation then the build tree install_name
    // is the same as the install tree.
    if (this->MacOSXUseInstallNameDir()) {
      return this->GetInstallNameDirForInstallTree();
    }

    // Use the build tree directory for the target.
    if (this->CanGenerateInstallNameDir(INSTALL_NAME_FOR_BUILD)) {
      std::string dir;
      if (this->MacOSXRpathInstallNameDirDefault()) {
        dir = "@rpath";
      } else {
        dir = this->GetDirectory(config);
      }
      dir += "/";
      return dir;
    }
  }
  return "";
}

std::string cmGeneratorTarget::GetInstallNameDirForInstallTree() const
{
  if (this->Makefile->IsOn("CMAKE_PLATFORM_HAS_INSTALLNAME")) {
    std::string dir;
    const char* install_name_dir = this->GetProperty("INSTALL_NAME_DIR");

    if (this->CanGenerateInstallNameDir(INSTALL_NAME_FOR_INSTALL)) {
      if (install_name_dir && *install_name_dir) {
        dir = install_name_dir;
        dir += "/";
      }
    }
    if (!install_name_dir) {
      if (this->MacOSXRpathInstallNameDirDefault()) {
        dir = "@rpath/";
      }
    }
    return dir;
  }
  return "";
}

cmListFileBacktrace cmGeneratorTarget::GetBacktrace() const
{
  return this->Target->GetBacktrace();
}

const std::set<std::string>& cmGeneratorTarget::GetUtilities() const
{
  return this->Target->GetUtilities();
}

const cmListFileBacktrace* cmGeneratorTarget::GetUtilityBacktrace(
  const std::string& u) const
{
  return this->Target->GetUtilityBacktrace(u);
}

bool cmGeneratorTarget::HaveWellDefinedOutputFiles() const
{
  return this->GetType() == cmStateEnums::STATIC_LIBRARY ||
    this->GetType() == cmStateEnums::SHARED_LIBRARY ||
    this->GetType() == cmStateEnums::MODULE_LIBRARY ||
    this->GetType() == cmStateEnums::OBJECT_LIBRARY ||
    this->GetType() == cmStateEnums::EXECUTABLE;
}

const char* cmGeneratorTarget::GetExportMacro() const
{
  // Define the symbol for targets that export symbols.
  if (this->GetType() == cmStateEnums::SHARED_LIBRARY ||
      this->GetType() == cmStateEnums::MODULE_LIBRARY ||
      this->IsExecutableWithExports()) {
    if (const char* custom_export_name = this->GetProperty("DEFINE_SYMBOL")) {
      this->ExportMacro = custom_export_name;
    } else {
      std::string in = this->GetName();
      in += "_EXPORTS";
      this->ExportMacro = cmSystemTools::MakeCidentifier(in);
    }
    return this->ExportMacro.c_str();
  }
  return nullptr;
}

class cmTargetCollectLinkLanguages
{
public:
  cmTargetCollectLinkLanguages(cmGeneratorTarget const* target,
                               const std::string& config,
                               std::unordered_set<std::string>& languages,
                               cmGeneratorTarget const* head)
    : Config(config)
    , Languages(languages)
    , HeadTarget(head)
    , Target(target)
  {
    this->Visited.insert(target);
  }

  void Visit(cmLinkItem const& item)
  {
    if (!item.Target) {
      if (item.AsStr().find("::") != std::string::npos) {
        bool noMessage = false;
        cmake::MessageType messageType = cmake::FATAL_ERROR;
        std::ostringstream e;
        switch (this->Target->GetLocalGenerator()->GetPolicyStatus(
          cmPolicies::CMP0028)) {
          case cmPolicies::WARN: {
            e << cmPolicies::GetPolicyWarning(cmPolicies::CMP0028) << "\n";
            messageType = cmake::AUTHOR_WARNING;
          } break;
          case cmPolicies::OLD:
            noMessage = true;
          case cmPolicies::REQUIRED_IF_USED:
          case cmPolicies::REQUIRED_ALWAYS:
          case cmPolicies::NEW:
            // Issue the fatal message.
            break;
        }

        if (!noMessage) {
          e << "Target \"" << this->Target->GetName()
            << "\" links to target \"" << item.AsStr()
            << "\" but the target was not found.  Perhaps a find_package() "
               "call is missing for an IMPORTED target, or an ALIAS target is "
               "missing?";
          this->Target->GetLocalGenerator()->GetCMakeInstance()->IssueMessage(
            messageType, e.str(), this->Target->GetBacktrace());
        }
      }
      return;
    }
    if (!this->Visited.insert(item.Target).second) {
      return;
    }
    cmLinkInterface const* iface =
      item.Target->GetLinkInterface(this->Config, this->HeadTarget);
    if (!iface) {
      return;
    }

    for (std::string const& language : iface->Languages) {
      this->Languages.insert(language);
    }

    for (cmLinkItem const& lib : iface->Libraries) {
      this->Visit(lib);
    }
  }

private:
  std::string Config;
  std::unordered_set<std::string>& Languages;
  cmGeneratorTarget const* HeadTarget;
  const cmGeneratorTarget* Target;
  std::set<cmGeneratorTarget const*> Visited;
};

cmGeneratorTarget::LinkClosure const* cmGeneratorTarget::GetLinkClosure(
  const std::string& config) const
{
  std::string key(cmSystemTools::UpperCase(config));
  LinkClosureMapType::iterator i = this->LinkClosureMap.find(key);
  if (i == this->LinkClosureMap.end()) {
    LinkClosure lc;
    this->ComputeLinkClosure(config, lc);
    LinkClosureMapType::value_type entry(key, lc);
    i = this->LinkClosureMap.insert(entry).first;
  }
  return &i->second;
}

class cmTargetSelectLinker
{
  int Preference;
  cmGeneratorTarget const* Target;
  cmGlobalGenerator* GG;
  std::set<std::string> Preferred;

public:
  cmTargetSelectLinker(cmGeneratorTarget const* target)
    : Preference(0)
    , Target(target)
  {
    this->GG = this->Target->GetLocalGenerator()->GetGlobalGenerator();
  }
  void Consider(const char* lang)
  {
    int preference = this->GG->GetLinkerPreference(lang);
    if (preference > this->Preference) {
      this->Preference = preference;
      this->Preferred.clear();
    }
    if (preference == this->Preference) {
      this->Preferred.insert(lang);
    }
  }
  std::string Choose()
  {
    if (this->Preferred.empty()) {
      return "";
    }
    if (this->Preferred.size() > 1) {
      std::ostringstream e;
      e << "Target " << this->Target->GetName()
        << " contains multiple languages with the highest linker preference"
        << " (" << this->Preference << "):\n";
      for (std::string const& li : this->Preferred) {
        e << "  " << li << "\n";
      }
      e << "Set the LINKER_LANGUAGE property for this target.";
      cmake* cm = this->Target->GetLocalGenerator()->GetCMakeInstance();
      cm->IssueMessage(cmake::FATAL_ERROR, e.str(),
                       this->Target->GetBacktrace());
    }
    return *this->Preferred.begin();
  }
};

void cmGeneratorTarget::ComputeLinkClosure(const std::string& config,
                                           LinkClosure& lc) const
{
  // Get languages built in this target.
  std::unordered_set<std::string> languages;
  cmLinkImplementation const* impl = this->GetLinkImplementation(config);
  assert(impl);
  for (std::string const& li : impl->Languages) {
    languages.insert(li);
  }

  // Add interface languages from linked targets.
  cmTargetCollectLinkLanguages cll(this, config, languages, this);
  for (cmLinkImplItem const& lib : impl->Libraries) {
    cll.Visit(lib);
  }

  // Store the transitive closure of languages.
  for (std::string const& lang : languages) {
    lc.Languages.push_back(lang);
  }

  // Choose the language whose linker should be used.
  if (this->GetProperty("HAS_CXX")) {
    lc.LinkerLanguage = "CXX";
  } else if (const char* linkerLang = this->GetProperty("LINKER_LANGUAGE")) {
    lc.LinkerLanguage = linkerLang;
  } else {
    // Find the language with the highest preference value.
    cmTargetSelectLinker tsl(this);

    // First select from the languages compiled directly in this target.
    for (std::string const& l : impl->Languages) {
      tsl.Consider(l.c_str());
    }

    // Now consider languages that propagate from linked targets.
    for (std::string const& lang : languages) {
      std::string propagates =
        "CMAKE_" + lang + "_LINKER_PREFERENCE_PROPAGATES";
      if (this->Makefile->IsOn(propagates)) {
        tsl.Consider(lang.c_str());
      }
    }

    lc.LinkerLanguage = tsl.Choose();
  }
}

void cmGeneratorTarget::GetFullNameComponents(
  std::string& prefix, std::string& base, std::string& suffix,
  const std::string& config, cmStateEnums::ArtifactType artifact) const
{
  this->GetFullNameInternal(config, artifact, prefix, base, suffix);
}

std::string cmGeneratorTarget::BuildBundleDirectory(
  const std::string& base, const std::string& config,
  BundleDirectoryLevel level) const
{
  std::string fpath = base;
  if (this->IsAppBundleOnApple()) {
    fpath += this->GetAppBundleDirectory(config, level);
  }
  if (this->IsFrameworkOnApple()) {
    fpath += this->GetFrameworkDirectory(config, level);
  }
  if (this->IsCFBundleOnApple()) {
    fpath += this->GetCFBundleDirectory(config, level);
  }
  return fpath;
}

std::string cmGeneratorTarget::GetMacContentDirectory(
  const std::string& config, cmStateEnums::ArtifactType artifact) const
{
  // Start with the output directory for the target.
  std::string fpath = this->GetDirectory(config, artifact);
  fpath += "/";
  BundleDirectoryLevel level = ContentLevel;
  if (this->IsFrameworkOnApple()) {
    // additional files with a framework go into the version specific
    // directory
    level = FullLevel;
  }
  fpath = this->BuildBundleDirectory(fpath, config, level);
  return fpath;
}

std::string cmGeneratorTarget::GetEffectiveFolderName() const
{
  std::string effectiveFolder;

  if (!this->GlobalGenerator->UseFolderProperty()) {
    return effectiveFolder;
  }

  const char* targetFolder = this->GetProperty("FOLDER");
  if (targetFolder) {
    effectiveFolder += targetFolder;
  }

  return effectiveFolder;
}

cmGeneratorTarget::CompileInfo const* cmGeneratorTarget::GetCompileInfo(
  const std::string& config) const
{
  // There is no compile information for imported targets.
  if (this->IsImported()) {
    return nullptr;
  }

  if (this->GetType() > cmStateEnums::OBJECT_LIBRARY) {
    std::string msg = "cmTarget::GetCompileInfo called for ";
    msg += this->GetName();
    msg += " which has type ";
    msg += cmState::GetTargetTypeName(this->GetType());
    this->LocalGenerator->IssueMessage(cmake::INTERNAL_ERROR, msg);
    return nullptr;
  }

  // Lookup/compute/cache the compile information for this configuration.
  std::string config_upper;
  if (!config.empty()) {
    config_upper = cmSystemTools::UpperCase(config);
  }
  CompileInfoMapType::const_iterator i =
    this->CompileInfoMap.find(config_upper);
  if (i == this->CompileInfoMap.end()) {
    CompileInfo info;
    this->ComputePDBOutputDir("COMPILE_PDB", config, info.CompilePdbDir);
    CompileInfoMapType::value_type entry(config_upper, info);
    i = this->CompileInfoMap.insert(entry).first;
  }
  return &i->second;
}

cmGeneratorTarget::ModuleDefinitionInfo const*
cmGeneratorTarget::GetModuleDefinitionInfo(std::string const& config) const
{
  // A module definition file only makes sense on certain target types.
  if (this->GetType() != cmStateEnums::SHARED_LIBRARY &&
      this->GetType() != cmStateEnums::MODULE_LIBRARY &&
      !this->IsExecutableWithExports()) {
    return nullptr;
  }

  // Lookup/compute/cache the compile information for this configuration.
  std::string config_upper;
  if (!config.empty()) {
    config_upper = cmSystemTools::UpperCase(config);
  }
  ModuleDefinitionInfoMapType::const_iterator i =
    this->ModuleDefinitionInfoMap.find(config_upper);
  if (i == this->ModuleDefinitionInfoMap.end()) {
    ModuleDefinitionInfo info;
    this->ComputeModuleDefinitionInfo(config, info);
    ModuleDefinitionInfoMapType::value_type entry(config_upper, info);
    i = this->ModuleDefinitionInfoMap.insert(entry).first;
  }
  return &i->second;
}

void cmGeneratorTarget::ComputeModuleDefinitionInfo(
  std::string const& config, ModuleDefinitionInfo& info) const
{
  this->GetModuleDefinitionSources(info.Sources, config);
  info.WindowsExportAllSymbols =
    this->Makefile->IsOn("CMAKE_SUPPORT_WINDOWS_EXPORT_ALL_SYMBOLS") &&
    this->GetPropertyAsBool("WINDOWS_EXPORT_ALL_SYMBOLS");
#if defined(_WIN32) && defined(CMAKE_BUILD_WITH_CMAKE)
  info.DefFileGenerated =
    info.WindowsExportAllSymbols || info.Sources.size() > 1;
#else
  // Our __create_def helper is only available on Windows.
  info.DefFileGenerated = false;
#endif
  if (info.DefFileGenerated) {
    info.DefFile = this->ObjectDirectory /* has slash */ + "exports.def";
  } else if (!info.Sources.empty()) {
    info.DefFile = info.Sources.front()->GetFullPath();
  }
}

bool cmGeneratorTarget::IsDLLPlatform() const
{
  return this->DLLPlatform;
}

void cmGeneratorTarget::GetAutoUicOptions(std::vector<std::string>& result,
                                          const std::string& config) const
{
  const char* prop =
    this->GetLinkInterfaceDependentStringProperty("AUTOUIC_OPTIONS", config);
  if (!prop) {
    return;
  }
  cmGeneratorExpression ge;

  cmGeneratorExpressionDAGChecker dagChecker(this, "AUTOUIC_OPTIONS", nullptr,
                                             nullptr);
  cmSystemTools::ExpandListArgument(
    ge.Parse(prop)->Evaluate(this->LocalGenerator, config, false, this,
                             &dagChecker),
    result);
}

void processILibs(const std::string& config,
                  cmGeneratorTarget const* headTarget, cmLinkItem const& item,
                  cmGlobalGenerator* gg,
                  std::vector<cmGeneratorTarget const*>& tgts,
                  std::set<cmGeneratorTarget const*>& emitted)
{
  if (item.Target && emitted.insert(item.Target).second) {
    tgts.push_back(item.Target);
    if (cmLinkInterfaceLibraries const* iface =
          item.Target->GetLinkInterfaceLibraries(config, headTarget, true)) {
      for (cmLinkItem const& lib : iface->Libraries) {
        processILibs(config, headTarget, lib, gg, tgts, emitted);
      }
    }
  }
}

const std::vector<const cmGeneratorTarget*>&
cmGeneratorTarget::GetLinkImplementationClosure(
  const std::string& config) const
{
  LinkImplClosure& tgts = this->LinkImplClosureMap[config];
  if (!tgts.Done) {
    tgts.Done = true;
    std::set<cmGeneratorTarget const*> emitted;

    cmLinkImplementationLibraries const* impl =
      this->GetLinkImplementationLibraries(config);

    for (cmLinkImplItem const& lib : impl->Libraries) {
      processILibs(config, this, lib,
                   this->LocalGenerator->GetGlobalGenerator(), tgts, emitted);
    }
  }
  return tgts;
}

class cmTargetTraceDependencies
{
public:
  cmTargetTraceDependencies(cmGeneratorTarget* target);
  void Trace();

private:
  cmGeneratorTarget* GeneratorTarget;
  cmMakefile* Makefile;
  cmLocalGenerator* LocalGenerator;
  cmGlobalGenerator const* GlobalGenerator;
  typedef cmGeneratorTarget::SourceEntry SourceEntry;
  SourceEntry* CurrentEntry;
  std::queue<cmSourceFile*> SourceQueue;
  std::set<cmSourceFile*> SourcesQueued;
  typedef std::map<std::string, cmSourceFile*> NameMapType;
  NameMapType NameMap;
  std::vector<std::string> NewSources;

  void QueueSource(cmSourceFile* sf);
  void FollowName(std::string const& name);
  void FollowNames(std::vector<std::string> const& names);
  bool IsUtility(std::string const& dep);
  void CheckCustomCommand(cmCustomCommand const& cc);
  void CheckCustomCommands(const std::vector<cmCustomCommand>& commands);
  void FollowCommandDepends(cmCustomCommand const& cc,
                            const std::string& config,
                            std::set<std::string>& emitted);
};

cmTargetTraceDependencies::cmTargetTraceDependencies(cmGeneratorTarget* target)
  : GeneratorTarget(target)
{
  // Convenience.
  this->Makefile = target->Target->GetMakefile();
  this->LocalGenerator = target->GetLocalGenerator();
  this->GlobalGenerator = this->LocalGenerator->GetGlobalGenerator();
  this->CurrentEntry = nullptr;

  // Queue all the source files already specified for the target.
  if (target->GetType() != cmStateEnums::INTERFACE_LIBRARY) {
    std::vector<std::string> configs;
    this->Makefile->GetConfigurations(configs);
    if (configs.empty()) {
      configs.emplace_back();
    }
    std::set<cmSourceFile*> emitted;
    for (std::string const& c : configs) {
      std::vector<cmSourceFile*> sources;
      this->GeneratorTarget->GetSourceFiles(sources, c);
      for (cmSourceFile* sf : sources) {
        const std::set<cmGeneratorTarget const*> tgts =
          this->GlobalGenerator->GetFilenameTargetDepends(sf);
        if (tgts.find(this->GeneratorTarget) != tgts.end()) {
          std::ostringstream e;
          e << "Evaluation output file\n  \"" << sf->GetFullPath()
            << "\"\ndepends on the sources of a target it is used in.  This "
               "is a dependency loop and is not allowed.";
          this->GeneratorTarget->LocalGenerator->IssueMessage(
            cmake::FATAL_ERROR, e.str());
          return;
        }
        if (emitted.insert(sf).second &&
            this->SourcesQueued.insert(sf).second) {
          this->SourceQueue.push(sf);
        }
      }
    }
  }

  // Queue pre-build, pre-link, and post-build rule dependencies.
  this->CheckCustomCommands(this->GeneratorTarget->GetPreBuildCommands());
  this->CheckCustomCommands(this->GeneratorTarget->GetPreLinkCommands());
  this->CheckCustomCommands(this->GeneratorTarget->GetPostBuildCommands());
}

void cmTargetTraceDependencies::Trace()
{
  // Process one dependency at a time until the queue is empty.
  while (!this->SourceQueue.empty()) {
    // Get the next source from the queue.
    cmSourceFile* sf = this->SourceQueue.front();
    this->SourceQueue.pop();
    this->CurrentEntry = &this->GeneratorTarget->SourceDepends[sf];

    // Queue dependencies added explicitly by the user.
    if (const char* additionalDeps = sf->GetProperty("OBJECT_DEPENDS")) {
      std::vector<std::string> objDeps;
      cmSystemTools::ExpandListArgument(additionalDeps, objDeps);
      for (std::string& objDep : objDeps) {
        if (cmSystemTools::FileIsFullPath(objDep)) {
          objDep = cmSystemTools::CollapseFullPath(objDep);
        }
      }
      this->FollowNames(objDeps);
    }

    // Queue the source needed to generate this file, if any.
    this->FollowName(sf->GetFullPath());

    // Queue dependencies added programmatically by commands.
    this->FollowNames(sf->GetDepends());

    // Queue custom command dependencies.
    if (cmCustomCommand const* cc = sf->GetCustomCommand()) {
      this->CheckCustomCommand(*cc);
    }
  }
  this->CurrentEntry = nullptr;

  this->GeneratorTarget->AddTracedSources(this->NewSources);
}

void cmTargetTraceDependencies::QueueSource(cmSourceFile* sf)
{
  if (this->SourcesQueued.insert(sf).second) {
    this->SourceQueue.push(sf);

    // Make sure this file is in the target at the end.
    this->NewSources.push_back(sf->GetFullPath());
  }
}

void cmTargetTraceDependencies::FollowName(std::string const& name)
{
  NameMapType::iterator i = this->NameMap.find(name);
  if (i == this->NameMap.end()) {
    // Check if we know how to generate this file.
    cmSourceFile* sf = this->Makefile->GetSourceFileWithOutput(name);
    NameMapType::value_type entry(name, sf);
    i = this->NameMap.insert(entry).first;
  }
  if (cmSourceFile* sf = i->second) {
    // Record the dependency we just followed.
    if (this->CurrentEntry) {
      this->CurrentEntry->Depends.push_back(sf);
    }
    this->QueueSource(sf);
  }
}

void cmTargetTraceDependencies::FollowNames(
  std::vector<std::string> const& names)
{
  for (std::string const& name : names) {
    this->FollowName(name);
  }
}

bool cmTargetTraceDependencies::IsUtility(std::string const& dep)
{
  // Dependencies on targets (utilities) are supposed to be named by
  // just the target name.  However for compatibility we support
  // naming the output file generated by the target (assuming there is
  // no output-name property which old code would not have set).  In
  // that case the target name will be the file basename of the
  // dependency.
  std::string util = cmSystemTools::GetFilenameName(dep);
  if (cmSystemTools::GetFilenameLastExtension(util) == ".exe") {
    util = cmSystemTools::GetFilenameWithoutLastExtension(util);
  }

  // Check for a target with this name.
  if (cmGeneratorTarget* t =
        this->GeneratorTarget->GetLocalGenerator()->FindGeneratorTargetToUse(
          util)) {
    // If we find the target and the dep was given as a full path,
    // then make sure it was not a full path to something else, and
    // the fact that the name matched a target was just a coincidence.
    if (cmSystemTools::FileIsFullPath(dep)) {
      if (t->GetType() >= cmStateEnums::EXECUTABLE &&
          t->GetType() <= cmStateEnums::MODULE_LIBRARY) {
        // This is really only for compatibility so we do not need to
        // worry about configuration names and output names.
        std::string tLocation = t->GetLocationForBuild();
        tLocation = cmSystemTools::GetFilenamePath(tLocation);
        std::string depLocation = cmSystemTools::GetFilenamePath(dep);
        depLocation = cmSystemTools::CollapseFullPath(depLocation);
        tLocation = cmSystemTools::CollapseFullPath(tLocation);
        if (depLocation == tLocation) {
          this->GeneratorTarget->Target->AddUtility(util);
          return true;
        }
      }
    } else {
      // The original name of the dependency was not a full path.  It
      // must name a target, so add the target-level dependency.
      this->GeneratorTarget->Target->AddUtility(util);
      return true;
    }
  }

  // The dependency does not name a target built in this project.
  return false;
}

void cmTargetTraceDependencies::CheckCustomCommand(cmCustomCommand const& cc)
{
  // Transform command names that reference targets built in this
  // project to corresponding target-level dependencies.
  cmGeneratorExpression ge(cc.GetBacktrace());

  // Add target-level dependencies referenced by generator expressions.
  std::set<cmGeneratorTarget*> targets;

  for (cmCustomCommandLine const& cCmdLine : cc.GetCommandLines()) {
    std::string const& command = *cCmdLine.begin();
    // Check for a target with this name.
    if (cmGeneratorTarget* t =
          this->LocalGenerator->FindGeneratorTargetToUse(command)) {
      if (t->GetType() == cmStateEnums::EXECUTABLE) {
        // The command refers to an executable target built in
        // this project.  Add the target-level dependency to make
        // sure the executable is up to date before this custom
        // command possibly runs.
        this->GeneratorTarget->Target->AddUtility(command);
      }
    }

    // Check for target references in generator expressions.
    for (std::string const& cl : cCmdLine) {
      const std::unique_ptr<cmCompiledGeneratorExpression> cge = ge.Parse(cl);
      cge->Evaluate(this->GeneratorTarget->GetLocalGenerator(), "", true);
      std::set<cmGeneratorTarget*> geTargets = cge->GetTargets();
      targets.insert(geTargets.begin(), geTargets.end());
    }
  }

  for (cmGeneratorTarget* target : targets) {
    this->GeneratorTarget->Target->AddUtility(target->GetName());
  }

  // Queue the custom command dependencies.
  std::vector<std::string> configs;
  std::set<std::string> emitted;
  this->Makefile->GetConfigurations(configs);
  if (configs.empty()) {
    configs.emplace_back();
  }
  for (std::string const& conf : configs) {
    this->FollowCommandDepends(cc, conf, emitted);
  }
}

void cmTargetTraceDependencies::FollowCommandDepends(
  cmCustomCommand const& cc, const std::string& config,
  std::set<std::string>& emitted)
{
  cmCustomCommandGenerator ccg(cc, config,
                               this->GeneratorTarget->LocalGenerator);

  const std::vector<std::string>& depends = ccg.GetDepends();

  for (std::string const& dep : depends) {
    if (emitted.insert(dep).second) {
      if (!this->IsUtility(dep)) {
        // The dependency does not name a target and may be a file we
        // know how to generate.  Queue it.
        this->FollowName(dep);
      }
    }
  }
}

void cmTargetTraceDependencies::CheckCustomCommands(
  const std::vector<cmCustomCommand>& commands)
{
  for (cmCustomCommand const& command : commands) {
    this->CheckCustomCommand(command);
  }
}

void cmGeneratorTarget::TraceDependencies()
{
  // CMake-generated targets have no dependencies to trace.  Normally tracing
  // would find nothing anyway, but when building CMake itself the "install"
  // target command ends up referencing the "cmake" target but we do not
  // really want the dependency because "install" depend on "all" anyway.
  if (this->GetType() == cmStateEnums::GLOBAL_TARGET) {
    return;
  }

  // Use a helper object to trace the dependencies.
  cmTargetTraceDependencies tracer(this);
  tracer.Trace();
}

std::string cmGeneratorTarget::GetCompilePDBDirectory(
  const std::string& config) const
{
  if (CompileInfo const* info = this->GetCompileInfo(config)) {
    return info->CompilePdbDir;
  }
  return "";
}

void cmGeneratorTarget::GetAppleArchs(const std::string& config,
                                      std::vector<std::string>& archVec) const
{
  const char* archs = nullptr;
  if (!config.empty()) {
    std::string defVarName = "OSX_ARCHITECTURES_";
    defVarName += cmSystemTools::UpperCase(config);
    archs = this->GetProperty(defVarName);
  }
  if (!archs) {
    archs = this->GetProperty("OSX_ARCHITECTURES");
  }
  if (archs) {
    cmSystemTools::ExpandListArgument(std::string(archs), archVec);
  }
}

//----------------------------------------------------------------------------
std::string cmGeneratorTarget::GetFeatureSpecificLinkRuleVariable(
  std::string const& var, std::string const& lang,
  std::string const& config) const
{
  if (this->IsIPOEnabled(lang, config)) {
    std::string varIPO = var + "_IPO";
    if (this->Makefile->IsDefinitionSet(varIPO)) {
      return varIPO;
    }
  }

  return var;
}

//----------------------------------------------------------------------------
std::string cmGeneratorTarget::GetCreateRuleVariable(
  std::string const& lang, std::string const& config) const
{
  switch (this->GetType()) {
    case cmStateEnums::STATIC_LIBRARY: {
      std::string var = "CMAKE_" + lang + "_CREATE_STATIC_LIBRARY";
      return this->GetFeatureSpecificLinkRuleVariable(var, lang, config);
    }
    case cmStateEnums::SHARED_LIBRARY:
      return "CMAKE_" + lang + "_CREATE_SHARED_LIBRARY";
    case cmStateEnums::MODULE_LIBRARY:
      return "CMAKE_" + lang + "_CREATE_SHARED_MODULE";
    case cmStateEnums::EXECUTABLE:
      return "CMAKE_" + lang + "_LINK_EXECUTABLE";
    default:
      break;
  }
  return "";
}
static void processIncludeDirectories(
  cmGeneratorTarget const* tgt,
  const std::vector<cmGeneratorTarget::TargetPropertyEntry*>& entries,
  std::vector<std::string>& includes,
  std::unordered_set<std::string>& uniqueIncludes,
  cmGeneratorExpressionDAGChecker* dagChecker, const std::string& config,
  bool debugIncludes, const std::string& language)
{
  for (cmGeneratorTarget::TargetPropertyEntry* entry : entries) {
    cmLinkImplItem const& item = entry->LinkImplItem;
    std::string const& targetName = item.AsStr();
    bool const fromImported = item.Target && item.Target->IsImported();
    bool const checkCMP0027 = item.FromGenex;
    std::vector<std::string> entryIncludes;
    cmSystemTools::ExpandListArgument(
      entry->ge->Evaluate(tgt->GetLocalGenerator(), config, false, tgt,
                          dagChecker, language),
      entryIncludes);

    std::string usedIncludes;
    for (std::string& entryInclude : entryIncludes) {
      if (fromImported && !cmSystemTools::FileExists(entryInclude)) {
        std::ostringstream e;
        cmake::MessageType messageType = cmake::FATAL_ERROR;
        if (checkCMP0027) {
          switch (tgt->GetPolicyStatusCMP0027()) {
            case cmPolicies::WARN:
              e << cmPolicies::GetPolicyWarning(cmPolicies::CMP0027) << "\n";
              CM_FALLTHROUGH;
            case cmPolicies::OLD:
              messageType = cmake::AUTHOR_WARNING;
              break;
            case cmPolicies::REQUIRED_ALWAYS:
            case cmPolicies::REQUIRED_IF_USED:
            case cmPolicies::NEW:
              break;
          }
        }
        /* clang-format off */
        e << "Imported target \"" << targetName << "\" includes "
             "non-existent path\n  \"" << entryInclude << "\"\nin its "
             "INTERFACE_INCLUDE_DIRECTORIES. Possible reasons include:\n"
             "* The path was deleted, renamed, or moved to another "
             "location.\n"
             "* An install or uninstall procedure did not complete "
             "successfully.\n"
             "* The installation package was faulty and references files it "
             "does not provide.\n";
        /* clang-format on */
        tgt->GetLocalGenerator()->IssueMessage(messageType, e.str());
        return;
      }

      if (!cmSystemTools::FileIsFullPath(entryInclude)) {
        std::ostringstream e;
        bool noMessage = false;
        cmake::MessageType messageType = cmake::FATAL_ERROR;
        if (!targetName.empty()) {
          /* clang-format off */
          e << "Target \"" << targetName << "\" contains relative "
            "path in its INTERFACE_INCLUDE_DIRECTORIES:\n"
            "  \"" << entryInclude << "\"";
          /* clang-format on */
        } else {
          switch (tgt->GetPolicyStatusCMP0021()) {
            case cmPolicies::WARN: {
              e << cmPolicies::GetPolicyWarning(cmPolicies::CMP0021) <<