/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying

   file LICENSE.rst or https://cmake.org/licensing for details.  */

#include "cmMakefileExecutableTargetGenerator.h"

#include <set>

#include <string>

#include <utility>

#include <vector>

#include <cm/memory>

#include <cmext/algorithm>

#include "cmGeneratedFileStream.h"

#include "cmGeneratorOptions.h"

#include "cmGeneratorTarget.h"

#include "cmGlobalUnixMakefileGenerator3.h"

#include "cmLinkLineComputer.h"

#include "cmLinkLineDeviceComputer.h"

#include "cmList.h"

#include "cmLocalGenerator.h"

#include "cmLocalUnixMakefileGenerator3.h"

#include "cmMakefile.h"

#include "cmOSXBundleGenerator.h"

#include "cmOutputConverter.h"

#include "cmRulePlaceholderExpander.h"

#include "cmState.h"

#include "cmStateDirectory.h"

#include "cmStateSnapshot.h"

#include "cmStateTypes.h"

#include "cmStringAlgorithms.h"

#include "cmSystemTools.h"

#include "cmValue.h"

cmMakefileExecutableTargetGenerator::cmMakefileExecutableTargetGenerator(

  cmGeneratorTarget* target)

  : cmMakefileTargetGenerator(target)

{

  this->CustomCommandDriver = OnDepends;

  this->TargetNames =

    this->GeneratorTarget->GetExecutableNames(this->GetConfigName());

  this->OSXBundleGenerator = cm::make_unique<cmOSXBundleGenerator>(target);

  this->OSXBundleGenerator->SetMacContentFolders(&this->MacContentFolders);

}

cmMakefileExecutableTargetGenerator::~cmMakefileExecutableTargetGenerator() =

  default;

void cmMakefileExecutableTargetGenerator::WriteRuleFiles()

{

  // create the build.make file and directory, put in the common blocks

  this->CreateRuleFile();

  // write rules used to help build object files

  this->WriteCommonCodeRules();

  // write the per-target per-language flags

  this->WriteTargetLanguageFlags();

  // write in rules for object files and custom commands

  this->WriteTargetBuildRules();

  // write the device link rules

  this->WriteDeviceExecutableRule(false);

  // write the link rules

  this->WriteExecutableRule(false);

  if (this->GeneratorTarget->NeedRelinkBeforeInstall(this->GetConfigName())) {

    // Write rules to link an installable version of the target.

    this->WriteExecutableRule(true);

  }

  this->WriteTargetLinkDependRules();

  // Write clean target

  this->WriteTargetCleanRules();

  // Write the dependency generation rule.  This must be done last so

  // that multiple output pair information is available.

  this->WriteTargetDependRules();

  // close the streams

  this->CloseFileStreams();

}

void cmMakefileExecutableTargetGenerator::WriteDeviceExecutableRule(

  bool relink)

{

#ifndef CMAKE_BOOTSTRAP

  this->DeviceLinkLanguage = deviceLinkLanguage(

    *this->GeneratorTarget, *this->LocalGenerator, this->GetConfigName());

  if (this->DeviceLinkLanguage.empty()) {

    return;

  }

  this->GeneratorTarget->GetLinkInformation(this->GetConfigName());

  cmGeneratorTarget::DeviceLinkSetter deviceLink(*this->GeneratorTarget);

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

  // Get the name of the device object to generate.

  std::string const& objExt = this->Makefile->GetSafeDefinition(

    cmStrCat("CMAKE_", this->DeviceLinkLanguage, "_OUTPUT_EXTENSION"));

  std::string const targetOutput = cmStrCat(

    this->GeneratorTarget->ObjectDirectory, "cmake_device_link", objExt);

  this->DeviceLinkObject = targetOutput;

  this->NumberOfProgressActions++;

  if (!this->NoRuleMessages) {

    cmLocalUnixMakefileGenerator3::EchoProgress progress;

    this->MakeEchoProgress(progress);

    // Add the link message.

    std::string buildEcho = cmStrCat(

      "Linking ", this->DeviceLinkLanguage, " device code ",

      this->LocalGenerator->ConvertToOutputFormat(

        this->LocalGenerator->MaybeRelativeToCurBinDir(this->DeviceLinkObject),

        cmOutputConverter::SHELL));

    this->LocalGenerator->AppendEcho(

      commands, buildEcho, cmLocalUnixMakefileGenerator3::EchoLink, &progress);

  }

  if (this->DeviceLinkLanguage == "CUDA" &&

      this->Makefile->GetSafeDefinition("CMAKE_CUDA_COMPILER_ID") == "Clang") {

    this->WriteDeviceLinkRule(commands, targetOutput);

  } else {

    this->WriteDriverDeviceExecutableRule(relink, commands, targetOutput);

  }

  // Write the main driver rule to build everything in this target.

  this->WriteTargetDriverRule(targetOutput, relink);

#else

  static_cast<void>(relink);

#endif

}

void cmMakefileExecutableTargetGenerator::WriteDriverDeviceExecutableRule(

  bool relink, std::vector<std::string>& commands,

  std::string const& targetOutput)

{

  std::string const& linkLanguage = this->DeviceLinkLanguage;

  // Build list of dependencies.

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

  this->AppendLinkDepends(depends, linkLanguage);

  // Add language feature flags.

  std::string langFlags;

  this->LocalGenerator->AddLanguageFlagsForLinking(

    langFlags, this->GeneratorTarget, linkLanguage, this->GetConfigName());

  // Construct a list of files associated with this executable that

  // may need to be cleaned.

  std::vector<std::string> exeCleanFiles;

  exeCleanFiles.push_back(

    this->LocalGenerator->MaybeRelativeToCurBinDir(targetOutput));

  // Determine whether a link script will be used.

  bool useLinkScript = this->GlobalGenerator->GetUseLinkScript();

  // Construct the main link rule.

  std::string const linkRuleVar =

    cmStrCat("CMAKE_", linkLanguage, "_DEVICE_LINK_EXECUTABLE");

  std::string const linkRule = this->GetLinkRule(linkRuleVar);

  std::vector<std::string> commands1;

  cmList real_link_commands(linkRule);

  bool useResponseFileForObjects =

    this->CheckUseResponseFileForObjects(linkLanguage);

  bool const useResponseFileForLibs =

    this->CheckUseResponseFileForLibraries(linkLanguage);

  // Expand the rule variables.

  {

    // Set path conversion for link script shells.

    this->LocalGenerator->SetLinkScriptShell(useLinkScript);

    std::unique_ptr<cmLinkLineDeviceComputer> linkLineComputer(

      new cmLinkLineDeviceComputer(

        this->LocalGenerator,

        this->LocalGenerator->GetStateSnapshot().GetDirectory(),

        linkLanguage));

    linkLineComputer->SetForResponse(useResponseFileForLibs);

    linkLineComputer->SetRelink(relink);

    // Create set of linking flags.

    std::string linkFlags;

    std::string ignored_;

    this->LocalGenerator->GetDeviceLinkFlags(

      *linkLineComputer, this->GetConfigName(), ignored_, linkFlags, ignored_,

      ignored_, this->GeneratorTarget);

    // Collect up flags to link in needed libraries.

    std::string linkLibs;

    this->CreateLinkLibs(

      linkLineComputer.get(), linkLibs, useResponseFileForLibs, depends,

      linkLanguage, cmMakefileTargetGenerator::ResponseFlagFor::DeviceLink);

    // Construct object file lists that may be needed to expand the

    // rule.

    std::string buildObjs;

    this->CreateObjectLists(

      useLinkScript, false, useResponseFileForObjects, buildObjs, depends,

      false, linkLanguage,

      cmMakefileTargetGenerator::ResponseFlagFor::DeviceLink);

    cmRulePlaceholderExpander::RuleVariables vars;

    std::string objectDir = this->GeneratorTarget->GetSupportDirectory();

    objectDir = this->LocalGenerator->ConvertToOutputFormat(

      this->LocalGenerator->MaybeRelativeToCurBinDir(objectDir),

      cmOutputConverter::SHELL);

    std::string targetSupportDir =

      this->GeneratorTarget->GetCMFSupportDirectory();

    targetSupportDir = this->LocalGenerator->ConvertToOutputFormat(

      this->LocalGenerator->MaybeRelativeToTopBinDir(targetSupportDir),

      cmOutputConverter::SHELL);

    std::string target = this->LocalGenerator->ConvertToOutputFormat(

      this->LocalGenerator->MaybeRelativeToCurBinDir(targetOutput),

      cmOutputConverter::SHELL);

    std::string targetFullPathCompilePDB =

      this->ComputeTargetCompilePDB(this->GetConfigName());

    std::string targetOutPathCompilePDB =

      this->LocalGenerator->ConvertToOutputFormat(targetFullPathCompilePDB,

                                                  cmOutputConverter::SHELL);

    vars.Language = linkLanguage.c_str();

    vars.Objects = buildObjs.c_str();

    vars.ObjectDir = objectDir.c_str();

    vars.Target = target.c_str();

    vars.TargetSupportDir = targetSupportDir.c_str();

    vars.LinkLibraries = linkLibs.c_str();

    vars.LanguageCompileFlags = langFlags.c_str();

    vars.LinkFlags = linkFlags.c_str();

    vars.TargetCompilePDB = targetOutPathCompilePDB.c_str();

    std::string launcher;

    std::string val = this->LocalGenerator->GetRuleLauncher(

      this->GeneratorTarget, "RULE_LAUNCH_LINK",

      this->Makefile->GetSafeDefinition("CMAKE_BUILD_TYPE"));

    if (cmNonempty(val)) {

      launcher = cmStrCat(val, ' ');

    }

    auto rulePlaceholderExpander =

      this->LocalGenerator->CreateRulePlaceholderExpander(cmBuildStep::Link);

    // Expand placeholders in the commands.

    rulePlaceholderExpander->SetTargetImpLib(targetOutput);

    for (auto& real_link_command : real_link_commands) {

      real_link_command = cmStrCat(launcher, std::move(real_link_command));

      rulePlaceholderExpander->ExpandRuleVariables(this->LocalGenerator,

                                                   real_link_command, vars);

    }

    // Restore path conversion to normal shells.

    this->LocalGenerator->SetLinkScriptShell(false);

  }

  // Optionally convert the build rule to use a script to avoid long

  // command lines in the make shell.

  if (useLinkScript) {

    // Use a link script.

    char const* name = (relink ? "drelink.txt" : "dlink.txt");

    this->CreateLinkScript(name, real_link_commands, commands1, depends);

  } else {

    // No link script.  Just use the link rule directly.

    commands1 = real_link_commands;

  }

  this->LocalGenerator->CreateCDCommand(

    commands1, this->Makefile->GetCurrentBinaryDirectory(),

    this->LocalGenerator->GetBinaryDirectory());

  cm::append(commands, commands1);

  commands1.clear();

  // Write the build rule.

  this->LocalGenerator->WriteMakeRule(*this->BuildFileStream, nullptr,

                                      targetOutput, depends, commands, false);

  // Clean all the possible executable names and symlinks.

  this->CleanFiles.insert(exeCleanFiles.begin(), exeCleanFiles.end());

}

void cmMakefileExecutableTargetGenerator::WriteExecutableRule(bool relink)

{

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

  // Get the name of the executable to generate.

  cmGeneratorTarget::Names targetNames =

    this->GeneratorTarget->GetExecutableNames(this->GetConfigName());

  // Construct the full path version of the names.

  std::string outpath =

    this->GeneratorTarget->GetDirectory(this->GetConfigName());

  if (this->GeneratorTarget->IsAppBundleOnApple()) {

    this->OSXBundleGenerator->CreateAppBundle(targetNames.Output, outpath,

                                              this->GetConfigName());

  }

  outpath += '/';

  std::string outpathImp;

  if (relink) {

    outpath = cmStrCat(this->Makefile->GetCurrentBinaryDirectory(),

                       "/CMakeFiles/CMakeRelink.dir");

    cmSystemTools::MakeDirectory(outpath);

    outpath += '/';

    if (!targetNames.ImportLibrary.empty()) {

      outpathImp = outpath;

    }

  } else {

    cmSystemTools::MakeDirectory(outpath);

    if (!targetNames.ImportLibrary.empty()) {

      outpathImp = this->GeneratorTarget->GetDirectory(

        this->GetConfigName(), cmStateEnums::ImportLibraryArtifact);

      cmSystemTools::MakeDirectory(outpathImp);

      outpathImp += '/';

    }

  }

  std::string compilePdbOutputPath =

    this->GeneratorTarget->GetCompilePDBDirectory(this->GetConfigName());

  cmSystemTools::MakeDirectory(compilePdbOutputPath);

  std::string pdbOutputPath =

    this->GeneratorTarget->GetPDBDirectory(this->GetConfigName());

  cmSystemTools::MakeDirectory(pdbOutputPath);

  pdbOutputPath += '/';

  std::string targetFullPath = outpath + targetNames.Output;

  std::string targetFullPathReal = outpath + targetNames.Real;

  std::string targetFullPathPDB = pdbOutputPath + targetNames.PDB;

  std::string targetFullPathImport = outpathImp + targetNames.ImportLibrary;

  std::string targetOutPathPDB = this->LocalGenerator->ConvertToOutputFormat(

    targetFullPathPDB, cmOutputConverter::SHELL);

  // Convert to the output path to use in constructing commands.

  std::string targetOutPath = this->LocalGenerator->ConvertToOutputFormat(

    this->LocalGenerator->MaybeRelativeToCurBinDir(targetFullPath),

    cmOutputConverter::SHELL);

  std::string targetOutPathReal = this->LocalGenerator->ConvertToOutputFormat(

    this->LocalGenerator->MaybeRelativeToCurBinDir(targetFullPathReal),

    cmOutputConverter::SHELL);

  std::string targetOutPathImport =

    this->LocalGenerator->ConvertToOutputFormat(

      this->LocalGenerator->MaybeRelativeToCurBinDir(targetFullPathImport),

      cmOutputConverter::SHELL);

  // Get the language to use for linking this executable.

  std::string linkLanguage =

    this->GeneratorTarget->GetLinkerLanguage(this->GetConfigName());

  // Make sure we have a link language.

  if (linkLanguage.empty()) {

    cmSystemTools::Error(

      cmStrCat("Cannot determine link language for target \"",

               this->GeneratorTarget->GetName(), "\"."));

    return;

  }

  auto linker = this->GeneratorTarget->GetLinkerTool(this->GetConfigName());

  // Build list of dependencies.

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

  this->AppendLinkDepends(depends, linkLanguage);

  if (!this->DeviceLinkObject.empty()) {

    depends.push_back(this->DeviceLinkObject);

  }

  this->NumberOfProgressActions++;

  if (!this->NoRuleMessages) {

    cmLocalUnixMakefileGenerator3::EchoProgress progress;

    this->MakeEchoProgress(progress);

    // Add the link message.

    std::string buildEcho =

      cmStrCat("Linking ", linkLanguage, " executable ", targetOutPath);

    this->LocalGenerator->AppendEcho(

      commands, buildEcho, cmLocalUnixMakefileGenerator3::EchoLink, &progress);

  }

  // Build a list of compiler flags and linker flags.

  std::string flags;

  std::string linkFlags;

  // Add flags to create an executable.

  this->LocalGenerator->AppendTargetCreationLinkFlags(

    linkFlags, this->GeneratorTarget, linkLanguage);

  this->LocalGenerator->AddTargetTypeLinkerFlags(

    linkFlags, this->GeneratorTarget, linkLanguage, this->GetConfigName());

  this->LocalGenerator->AddPerLanguageLinkFlags(

    linkFlags, this->GeneratorTarget, linkLanguage, this->GetConfigName());

  {

    auto exeType =

      cmStrCat("CMAKE_", linkLanguage, "_CREATE_",

               (this->GeneratorTarget->IsWin32Executable(

                  this->Makefile->GetDefinition("CMAKE_BUILD_TYPE"))

                  ? "WIN32"

                  : "CONSOLE"),

               "_EXE");

    this->LocalGenerator->AppendFlags(

      linkFlags, this->Makefile->GetDefinition(exeType), exeType,

      this->GeneratorTarget, cmBuildStep::Link, linkLanguage);

  }

  // Add symbol export flags if necessary.

  if (this->GeneratorTarget->IsExecutableWithExports()) {

    std::string export_flag_var =

      cmStrCat("CMAKE_EXE_EXPORTS_", linkLanguage, "_FLAG");

    this->LocalGenerator->AppendFlags(

      linkFlags, this->Makefile->GetSafeDefinition(export_flag_var));

  }

  this->LocalGenerator->AppendFlags(linkFlags,

                                    this->LocalGenerator->GetExeExportFlags(

                                      linkLanguage, *this->GeneratorTarget));

  this->UseLWYU = this->LocalGenerator->AppendLWYUFlags(

    linkFlags, this->GeneratorTarget, linkLanguage);

  // Add language feature flags.

  this->LocalGenerator->AddLanguageFlagsForLinking(

    flags, this->GeneratorTarget, linkLanguage, this->GetConfigName());

  this->LocalGenerator->AddArchitectureFlags(

    flags, this->GeneratorTarget, linkLanguage, this->GetConfigName());

  // Add target-specific linker flags.

  this->GetTargetLinkFlags(linkFlags, linkLanguage);

  {

    std::unique_ptr<cmLinkLineComputer> linkLineComputer =

      this->CreateLinkLineComputer(

        this->LocalGenerator,

        this->LocalGenerator->GetStateSnapshot().GetDirectory());

    this->LocalGenerator->AppendModuleDefinitionFlag(

      linkFlags, this->GeneratorTarget, linkLineComputer.get(),

      this->GetConfigName(), linkLanguage);

  }

  this->LocalGenerator->AppendIPOLinkerFlags(

    linkFlags, this->GeneratorTarget, this->GetConfigName(), linkLanguage);

  // Construct a list of files associated with this executable that

  // may need to be cleaned.

  std::vector<std::string> exeCleanFiles;

  exeCleanFiles.push_back(

    this->LocalGenerator->MaybeRelativeToCurBinDir(targetFullPath));

#ifdef _WIN32

  // There may be a manifest file for this target.  Add it to the

  // clean set just in case.

  exeCleanFiles.push_back(this->LocalGenerator->MaybeRelativeToCurBinDir(

    targetFullPath + ".manifest"));

#endif

  if (this->TargetNames.Real != this->TargetNames.Output) {

    exeCleanFiles.push_back(

      this->LocalGenerator->MaybeRelativeToCurBinDir(targetFullPathReal));

  }

  if (!this->TargetNames.ImportLibrary.empty()) {

    exeCleanFiles.push_back(

      this->LocalGenerator->MaybeRelativeToCurBinDir(targetFullPathImport));

    std::string implib;

    if (this->GeneratorTarget->GetImplibGNUtoMS(

          this->GetConfigName(), targetFullPathImport, implib)) {

      exeCleanFiles.push_back(

        this->LocalGenerator->MaybeRelativeToCurBinDir(implib));

    }

  }

  // List the PDB for cleaning only when the whole target is

  // cleaned.  We do not want to delete the .pdb file just before

  // linking the target.

  this->CleanFiles.insert(

    this->LocalGenerator->MaybeRelativeToCurBinDir(targetFullPathPDB));

  // Add the pre-build and pre-link rules building but not when relinking.

  if (!relink) {

    this->LocalGenerator->AppendCustomCommands(

      commands, this->GeneratorTarget->GetPreBuildCommands(),

      this->GeneratorTarget, this->LocalGenerator->GetBinaryDirectory());

    this->LocalGenerator->AppendCustomCommands(

      commands, this->GeneratorTarget->GetPreLinkCommands(),

      this->GeneratorTarget, this->LocalGenerator->GetBinaryDirectory());

  }

  // Determine whether a link script will be used.

  bool useLinkScript = this->GlobalGenerator->GetUseLinkScript();

  // Construct the main link rule.

  std::string linkRuleVar = this->GeneratorTarget->GetCreateRuleVariable(

    linkLanguage, this->GetConfigName());

  std::string linkRule = this->GetLinkRule(linkRuleVar);

  std::vector<std::string> commands1;

  cmList real_link_commands(linkRule);

  if (this->GeneratorTarget->IsExecutableWithExports()) {

    // If a separate rule for creating an import library is specified

    // add it now.

    std::string implibRuleVar =

      cmStrCat("CMAKE_", linkLanguage, "_CREATE_IMPORT_LIBRARY");

    real_link_commands.append(this->Makefile->GetDefinition(implibRuleVar));

  }

  bool useResponseFileForObjects =

    this->CheckUseResponseFileForObjects(linkLanguage);

  bool const useResponseFileForLibs =

    this->CheckUseResponseFileForLibraries(linkLanguage);

  // Expand the rule variables.

  {

    bool useWatcomQuote =

      this->Makefile->IsOn(linkRuleVar + "_USE_WATCOM_QUOTE");

    // Set path conversion for link script shells.

    this->LocalGenerator->SetLinkScriptShell(useLinkScript);

    std::unique_ptr<cmLinkLineComputer> linkLineComputer =

      this->CreateLinkLineComputer(

        this->LocalGenerator,

        this->LocalGenerator->GetStateSnapshot().GetDirectory());

    linkLineComputer->SetForResponse(useResponseFileForLibs);

    linkLineComputer->SetUseWatcomQuote(useWatcomQuote);

    linkLineComputer->SetRelink(relink);

    // Collect up flags to link in needed libraries.

    std::string linkLibs;

    this->CreateLinkLibs(linkLineComputer.get(), linkLibs,

                         useResponseFileForLibs, depends, linkLanguage);

    // Construct object file lists that may be needed to expand the

    // rule.

    std::string buildObjs;

    this->CreateObjectLists(useLinkScript, false, useResponseFileForObjects,

                            buildObjs, depends, useWatcomQuote, linkLanguage);

    if (!this->DeviceLinkObject.empty()) {

      buildObjs = cmStrCat(std::move(buildObjs), ' ',

                           this->LocalGenerator->ConvertToOutputFormat(

                             this->LocalGenerator->MaybeRelativeToCurBinDir(

                               this->DeviceLinkObject),

                             cmOutputConverter::SHELL));

    }

    // maybe create .def file from list of objects

    this->GenDefFile(real_link_commands);

    std::string manifests = this->GetManifests(this->GetConfigName());

    std::string const& aixExports = this->GetAIXExports(this->GetConfigName());

    cmRulePlaceholderExpander::RuleVariables vars;

    vars.CMTargetName = this->GeneratorTarget->GetName().c_str();

    vars.CMTargetType =

      cmState::GetTargetTypeName(this->GeneratorTarget->GetType()).c_str();

    vars.Language = linkLanguage.c_str();

    vars.Linker = linker.c_str();

    vars.AIXExports = aixExports.c_str();

    vars.Objects = buildObjs.c_str();

    std::string objectDir = this->GeneratorTarget->GetSupportDirectory();

    objectDir = this->LocalGenerator->ConvertToOutputFormat(

      this->LocalGenerator->MaybeRelativeToCurBinDir(objectDir),

      cmOutputConverter::SHELL);

    vars.ObjectDir = objectDir.c_str();

    std::string targetSupportDir =

      this->GeneratorTarget->GetCMFSupportDirectory();

    targetSupportDir = this->LocalGenerator->ConvertToOutputFormat(

      this->LocalGenerator->MaybeRelativeToTopBinDir(targetSupportDir),

      cmOutputConverter::SHELL);

    vars.TargetSupportDir = targetSupportDir.c_str();

    std::string target = this->LocalGenerator->ConvertToOutputFormat(

      this->LocalGenerator->MaybeRelativeToCurBinDir(targetFullPathReal),

      cmOutputConverter::SHELL, useWatcomQuote);

    vars.Target = target.c_str();

    vars.TargetPDB = targetOutPathPDB.c_str();

    vars.Config = this->GetConfigName().c_str();

    // Setup the target version.

    std::string targetVersionMajor;

    std::string targetVersionMinor;

    {

      int major;

      int minor;

      this->GeneratorTarget->GetTargetVersion(major, minor);

      targetVersionMajor = std::to_string(major);

      targetVersionMinor = std::to_string(minor);

    }

    vars.TargetVersionMajor = targetVersionMajor.c_str();

    vars.TargetVersionMinor = targetVersionMinor.c_str();

    vars.LinkLibraries = linkLibs.c_str();

    vars.Flags = flags.c_str();

    vars.LinkFlags = linkFlags.c_str();

    vars.Manifests = manifests.c_str();

    std::string const linkerLauncher = this->ConvertLauncherToShell(

      this->GetLinkerLauncher(this->GetConfigName()));

    if (cmNonempty(linkerLauncher)) {

      vars.Launcher = linkerLauncher.c_str();

    }

    std::string rustMainCrateRootPath;

    std::string rustLinkCrates;

    std::string rustNativeObjects;

    if (CreateRustLinkArguments(linkLanguage, rustMainCrateRootPath,

                                rustLinkCrates, rustNativeObjects)) {

      vars.RustMainCrateRoot = rustMainCrateRootPath.c_str();

      vars.RustLinkCrates = rustLinkCrates.c_str();

      vars.RustNativeObjects = rustNativeObjects.c_str();

    }

    if (this->UseLWYU) {

      cmValue lwyuCheck =

        this->Makefile->GetDefinition("CMAKE_LINK_WHAT_YOU_USE_CHECK");

      if (lwyuCheck) {

        std::string cmakeCommand = cmStrCat(

          this->LocalGenerator->ConvertToOutputFormat(

            cmSystemTools::GetCMakeCommand(), cmLocalGenerator::SHELL),

          " -E __run_co_compile --lwyu=");

        cmakeCommand += this->LocalGenerator->EscapeForShell(*lwyuCheck);

        cmakeCommand =

          cmStrCat(std::move(cmakeCommand), " --source=", targetOutPathReal);

        real_link_commands.push_back(std::move(cmakeCommand));

      }

    }

    std::string launcher;

    std::string val = this->LocalGenerator->GetRuleLauncher(

      this->GeneratorTarget, "RULE_LAUNCH_LINK",

      this->Makefile->GetSafeDefinition("CMAKE_BUILD_TYPE"));

    if (cmNonempty(val)) {

      launcher = cmStrCat(val, ' ');

    }

    auto rulePlaceholderExpander =

      this->LocalGenerator->CreateRulePlaceholderExpander(cmBuildStep::Link);

    // Expand placeholders in the commands.

    rulePlaceholderExpander->SetTargetImpLib(targetOutPathImport);

    for (auto& real_link_command : real_link_commands) {

      real_link_command = cmStrCat(launcher, std::move(real_link_command));

      rulePlaceholderExpander->ExpandRuleVariables(this->LocalGenerator,

                                                   real_link_command, vars);

    }

    // Restore path conversion to normal shells.

    this->LocalGenerator->SetLinkScriptShell(false);

  }

  // Optionally convert the build rule to use a script to avoid long

  // command lines in the make shell.

  if (useLinkScript) {

    // Use a link script.

    char const* name = (relink ? "relink.txt" : "link.txt");

    this->CreateLinkScript(name, real_link_commands, commands1, depends);

  } else {

    // No link script.  Just use the link rule directly.

    commands1 = real_link_commands;

  }

  this->LocalGenerator->CreateCDCommand(

    commands1, this->Makefile->GetCurrentBinaryDirectory(),

    this->LocalGenerator->GetBinaryDirectory());

  cm::append(commands, commands1);

  commands1.clear();

  // Add a rule to create necessary symlinks for the library.

  if (targetOutPath != targetOutPathReal) {

    std::string symlink =

      cmStrCat("$(CMAKE_COMMAND) -E cmake_symlink_executable ",

               targetOutPathReal, ' ', targetOutPath);

    commands1.push_back(std::move(symlink));

    this->LocalGenerator->CreateCDCommand(

      commands1, this->Makefile->GetCurrentBinaryDirectory(),

      this->LocalGenerator->GetBinaryDirectory());

    cm::append(commands, commands1);

    commands1.clear();

  }

  // Add the post-build rules when building but not when relinking.

  if (!relink) {

    this->LocalGenerator->AppendCustomCommands(

      commands, this->GeneratorTarget->GetPostBuildCommands(),

      this->GeneratorTarget, this->LocalGenerator->GetBinaryDirectory());

  }

  // Write the build rule.

  this->LocalGenerator->WriteMakeRule(*this->BuildFileStream, nullptr,

                                      targetFullPathReal, depends, commands,

                                      false);

  // The symlink name for the target should depend on the real target

  // so if the target version changes it rebuilds and recreates the

  // symlink.

  if (targetFullPath != targetFullPathReal) {

    depends.clear();

    commands.clear();

    depends.push_back(targetFullPathReal);

    this->LocalGenerator->WriteMakeRule(*this->BuildFileStream, nullptr,

                                        targetFullPath, depends, commands,

                                        false);

  }

  // Write the main driver rule to build everything in this target.

  this->WriteTargetDriverRule(targetFullPath, relink);

  // Clean all the possible executable names and symlinks.

  this->CleanFiles.insert(exeCleanFiles.begin(), exeCleanFiles.end());

}