text: //===-- Clang.cpp - Clang+LLVM ToolChain Implementations --------*- C++ -*-===//
  //
  // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
  // See https://llvm.org/LICENSE.txt for license information.
  // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  //
  //===----------------------------------------------------------------------===//
  
  #include "Clang.h"
  #include "AMDGPU.h"
  #include "Arch/AArch64.h"
  #include "Arch/ARM.h"
  #include "Arch/M68k.h"
  #include "Arch/Mips.h"
  #include "Arch/PPC.h"
  #include "Arch/RISCV.h"
  #include "Arch/Sparc.h"
  #include "Arch/SystemZ.h"
  #include "Arch/VE.h"
  #include "Arch/X86.h"
  #include "CommonArgs.h"
  #include "Hexagon.h"
  #include "InputInfo.h"
  #include "MSP430.h"
  #include "PS4CPU.h"
  #include "clang/Basic/CharInfo.h"
  #include "clang/Basic/CodeGenOptions.h"
  #include "clang/Basic/LangOptions.h"
  #include "clang/Basic/ObjCRuntime.h"
  #include "clang/Basic/Version.h"
  #include "clang/Driver/Distro.h"
  #include "clang/Driver/DriverDiagnostic.h"
  #include "clang/Driver/Options.h"
  #include "clang/Driver/SanitizerArgs.h"
  #include "clang/Driver/XRayArgs.h"
  #include "llvm/ADT/StringExtras.h"
  #include "llvm/Config/llvm-config.h"
  #include "llvm/Option/ArgList.h"
  #include "llvm/Support/CodeGen.h"
  #include "llvm/Support/Compiler.h"
  #include "llvm/Support/Compression.h"
  #include "llvm/Support/FileSystem.h"
  #include "llvm/Support/Host.h"
  #include "llvm/Support/Path.h"
  #include "llvm/Support/Process.h"
  #include "llvm/Support/TargetParser.h"
  #include "llvm/Support/YAMLParser.h"
  
  using namespace clang::driver;
  using namespace clang::driver::tools;
  using namespace clang;
  using namespace llvm::opt;
  
  static void CheckPreprocessingOptions(const Driver &D, const ArgList &Args) {
    if (Arg *A =
            Args.getLastArg(clang::driver::options::OPT_C, options::OPT_CC)) {
      if (!Args.hasArg(options::OPT_E) && !Args.hasArg(options::OPT__SLASH_P) &&
          !Args.hasArg(options::OPT__SLASH_EP) && !D.CCCIsCPP()) {
        D.Diag(clang::diag::err_drv_argument_only_allowed_with)
            << A->getBaseArg().getAsString(Args)
            << (D.IsCLMode() ? "/E, /P or /EP" : "-E");
      }
    }
  }
  
  static void CheckCodeGenerationOptions(const Driver &D, const ArgList &Args) {
    // In gcc, only ARM checks this, but it seems reasonable to check universally.
    if (Args.hasArg(options::OPT_static))
      if (const Arg *A =
              Args.getLastArg(options::OPT_dynamic, options::OPT_mdynamic_no_pic))
        D.Diag(diag::err_drv_argument_not_allowed_with) << A->getAsString(Args)
                                                        << "-static";
  }
  
  // Add backslashes to escape spaces and other backslashes.
  // This is used for the space-separated argument list specified with
  // the -dwarf-debug-flags option.
  static void EscapeSpacesAndBackslashes(const char *Arg,
                                         SmallVectorImpl<char> &Res) {
    for (; *Arg; ++Arg) {
      switch (*Arg) {
      default:
        break;
      case ' ':
      case '\\':
        Res.push_back('\\');
        break;
      }
      Res.push_back(*Arg);
    }
  }
  
  // Quote target names for inclusion in GNU Make dependency files.
  // Only the characters '$', '#', ' ', '\t' are quoted.
  static void QuoteTarget(StringRef Target, SmallVectorImpl<char> &Res) {
    for (unsigned i = 0, e = Target.size(); i != e; ++i) {
      switch (Target[i]) {
      case ' ':
      case '\t':
        // Escape the preceding backslashes
        for (int j = i - 1; j >= 0 && Target[j] == '\\'; --j)
          Res.push_back('\\');
  
        // Escape the space/tab
        Res.push_back('\\');
        break;
      case '$':
        Res.push_back('$');
        break;
      case '#':
        Res.push_back('\\');
        break;
      default:
        break;
      }
  
      Res.push_back(Target[i]);
    }
  }
  
  /// Apply \a Work on the current tool chain \a RegularToolChain and any other
  /// offloading tool chain that is associated with the current action \a JA.
  static void
  forAllAssociatedToolChains(Compilation &C, const JobAction &JA,
                             const ToolChain &RegularToolChain,
                             llvm::function_ref<void(const ToolChain &)> Work) {
    // Apply Work on the current/regular tool chain.
    Work(RegularToolChain);
  
    // Apply Work on all the offloading tool chains associated with the current
    // action.
    if (JA.isHostOffloading(Action::OFK_Cuda))
      Work(*C.getSingleOffloadToolChain<Action::OFK_Cuda>());
    else if (JA.isDeviceOffloading(Action::OFK_Cuda))
      Work(*C.getSingleOffloadToolChain<Action::OFK_Host>());
    else if (JA.isHostOffloading(Action::OFK_HIP))
      Work(*C.getSingleOffloadToolChain<Action::OFK_HIP>());
    else if (JA.isDeviceOffloading(Action::OFK_HIP))
      Work(*C.getSingleOffloadToolChain<Action::OFK_Host>());
  
    if (JA.isHostOffloading(Action::OFK_OpenMP)) {
      auto TCs = C.getOffloadToolChains<Action::OFK_OpenMP>();
      for (auto II = TCs.first, IE = TCs.second; II != IE; ++II)
        Work(*II->second);
    } else if (JA.isDeviceOffloading(Action::OFK_OpenMP))
      Work(*C.getSingleOffloadToolChain<Action::OFK_Host>());
  
    //
    // TODO: Add support for other offloading programming models here.
    //
  }
  
  /// This is a helper function for validating the optional refinement step
  /// parameter in reciprocal argument strings. Return false if there is an error
  /// parsing the refinement step. Otherwise, return true and set the Position
  /// of the refinement step in the input string.
  static bool getRefinementStep(StringRef In, const Driver &D,
                                const Arg &A, size_t &Position) {
    const char RefinementStepToken = ':';
    Position = In.find(RefinementStepToken);
    if (Position != StringRef::npos) {
      StringRef Option = A.getOption().getName();
      StringRef RefStep = In.substr(Position + 1);
      // Allow exactly one numeric character for the additional refinement
      // step parameter. This is reasonable for all currently-supported
      // operations and architectures because we would expect that a larger value
      // of refinement steps would cause the estimate "optimization" to
      // under-perform the native operation. Also, if the estimate does not
      // converge quickly, it probably will not ever converge, so further
      // refinement steps will not produce a better answer.
      if (RefStep.size() != 1) {
        D.Diag(diag::err_drv_invalid_value) << Option << RefStep;
        return false;
      }
      char RefStepChar = RefStep[0];
      if (RefStepChar < '0' || RefStepChar > '9') {
        D.Diag(diag::err_drv_invalid_value) << Option << RefStep;
        return false;
      }
    }
    return true;
  }
  
  /// The -mrecip flag requires processing of many optional parameters.
  static void ParseMRecip(const Driver &D, const ArgList &Args,
                          ArgStringList &OutStrings) {
    StringRef DisabledPrefixIn = "!";
    StringRef DisabledPrefixOut = "!";
    StringRef EnabledPrefixOut = "";
    StringRef Out = "-mrecip=";
  
    Arg *A = Args.getLastArg(options::OPT_mrecip, options::OPT_mrecip_EQ);
    if (!A)
      return;
  
    unsigned NumOptions = A->getNumValues();
    if (NumOptions == 0) {
      // No option is the same as "all".
      OutStrings.push_back(Args.MakeArgString(Out + "all"));
      return;
    }
  
    // Pass through "all", "none", or "default" with an optional refinement step.
    if (NumOptions == 1) {
      StringRef Val = A->getValue(0);
      size_t RefStepLoc;
      if (!getRefinementStep(Val, D, *A, RefStepLoc))
        return;
      StringRef ValBase = Val.slice(0, RefStepLoc);
      if (ValBase == "all" || ValBase == "none" || ValBase == "default") {
        OutStrings.push_back(Args.MakeArgString(Out + Val));
        return;
      }
    }
  
    // Each reciprocal type may be enabled or disabled individually.
    // Check each input value for validity, concatenate them all back together,
    // and pass through.
  
    llvm::StringMap<bool> OptionStrings;
    OptionStrings.insert(std::make_pair("divd", false));
    OptionStrings.insert(std::make_pair("divf", false));
    OptionStrings.insert(std::make_pair("vec-divd", false));
    OptionStrings.insert(std::make_pair("vec-divf", false));
    OptionStrings.insert(std::make_pair("sqrtd", false));
    OptionStrings.insert(std::make_pair("sqrtf", false));
    OptionStrings.insert(std::make_pair("vec-sqrtd", false));
    OptionStrings.insert(std::make_pair("vec-sqrtf", false));
  
    for (unsigned i = 0; i != NumOptions; ++i) {
      StringRef Val = A->getValue(i);
  
      bool IsDisabled = Val.startswith(DisabledPrefixIn);
      // Ignore the disablement token for string matching.
      if (IsDisabled)
        Val = Val.substr(1);
  
      size_t RefStep;
      if (!getRefinementStep(Val, D, *A, RefStep))
        return;
  
      StringRef ValBase = Val.slice(0, RefStep);
      llvm::StringMap<bool>::iterator OptionIter = OptionStrings.find(ValBase);
      if (OptionIter == OptionStrings.end()) {
        // Try again specifying float suffix.
        OptionIter = OptionStrings.find(ValBase.str() + 'f');
        if (OptionIter == OptionStrings.end()) {
          // The input name did not match any known option string.
          D.Diag(diag::err_drv_unknown_argument) << Val;
          return;
        }
        // The option was specified without a float or double suffix.
        // Make sure that the double entry was not already specified.
        // The float entry will be checked below.
        if (OptionStrings[ValBase.str() + 'd']) {
          D.Diag(diag::err_drv_invalid_value) << A->getOption().getName() << Val;
          return;
        }
      }
  
      if (OptionIter->second == true) {
        // Duplicate option specified.
        D.Diag(diag::err_drv_invalid_value) << A->getOption().getName() << Val;
        return;
      }
  
      // Mark the matched option as found. Do not allow duplicate specifiers.
      OptionIter->second = true;
  
      // If the precision was not specified, also mark the double entry as found.
      if (ValBase.back() != 'f' && ValBase.back() != 'd')
        OptionStrings[ValBase.str() + 'd'] = true;
  
      // Build the output string.
      StringRef Prefix = IsDisabled ? DisabledPrefixOut : EnabledPrefixOut;
      Out = Args.MakeArgString(Out + Prefix + Val);
      if (i != NumOptions - 1)
        Out = Args.MakeArgString(Out + ",");
    }
  
    OutStrings.push_back(Args.MakeArgString(Out));
  }
  
  /// The -mprefer-vector-width option accepts either a positive integer
  /// or the string "none".
  static void ParseMPreferVectorWidth(const Driver &D, const ArgList &Args,
                                      ArgStringList &CmdArgs) {
    Arg *A = Args.getLastArg(options::OPT_mprefer_vector_width_EQ);
    if (!A)
      return;
  
    StringRef Value = A->getValue();
    if (Value == "none") {
      CmdArgs.push_back("-mprefer-vector-width=none");
    } else {
      unsigned Width;
      if (Value.getAsInteger(10, Width)) {
        D.Diag(diag::err_drv_invalid_value) << A->getOption().getName() << Value;
        return;
      }
      CmdArgs.push_back(Args.MakeArgString("-mprefer-vector-width=" + Value));
    }
  }
  
  static void getWebAssemblyTargetFeatures(const ArgList &Args,
                                           std::vector<StringRef> &Features) {
    handleTargetFeaturesGroup(Args, Features, options::OPT_m_wasm_Features_Group);
  }
  
  static void getTargetFeatures(const Driver &D, const llvm::Triple &Triple,
                                const ArgList &Args, ArgStringList &CmdArgs,
                                bool ForAS, bool IsAux = false) {
    std::vector<StringRef> Features;
    switch (Triple.getArch()) {
    default:
      break;
    case llvm::Triple::mips:
    case llvm::Triple::mipsel:
    case llvm::Triple::mips64:
    case llvm::Triple::mips64el:
      mips::getMIPSTargetFeatures(D, Triple, Args, Features);
      break;
  
    case llvm::Triple::arm:
    case llvm::Triple::armeb:
    case llvm::Triple::thumb:
    case llvm::Triple::thumbeb:
      arm::getARMTargetFeatures(D, Triple, Args, CmdArgs, Features, ForAS);
      break;
  
    case llvm::Triple::ppc:
    case llvm::Triple::ppcle:
    case llvm::Triple::ppc64:
    case llvm::Triple::ppc64le:
      ppc::getPPCTargetFeatures(D, Triple, Args, Features);
      break;
    case llvm::Triple::riscv32:
    case llvm::Triple::riscv64:
      riscv::getRISCVTargetFeatures(D, Triple, Args, Features);
      break;
    case llvm::Triple::systemz:
      systemz::getSystemZTargetFeatures(D, Args, Features);
      break;
    case llvm::Triple::aarch64:
    case llvm::Triple::aarch64_32:
    case llvm::Triple::aarch64_be:
      aarch64::getAArch64TargetFeatures(D, Triple, Args, Features, ForAS);
      break;
    case llvm::Triple::x86:
    case llvm::Triple::x86_64:
      x86::getX86TargetFeatures(D, Triple, Args, Features);
      break;
    case llvm::Triple::hexagon:
      hexagon::getHexagonTargetFeatures(D, Args, Features);
      break;
    case llvm::Triple::wasm32:
    case llvm::Triple::wasm64:
      getWebAssemblyTargetFeatures(Args, Features);
      break;
    case llvm::Triple::sparc:
    case llvm::Triple::sparcel:
    case llvm::Triple::sparcv9:
      sparc::getSparcTargetFeatures(D, Args, Features);
      break;
    case llvm::Triple::r600:
    case llvm::Triple::amdgcn:
      amdgpu::getAMDGPUTargetFeatures(D, Triple, Args, Features);
      break;
    case llvm::Triple::m68k:
      m68k::getM68kTargetFeatures(D, Triple, Args, Features);
      break;
    case llvm::Triple::msp430:
      msp430::getMSP430TargetFeatures(D, Args, Features);
      break;
    case llvm::Triple::ve:
      ve::getVETargetFeatures(D, Args, Features);
      break;
    }
  
    for (auto Feature : unifyTargetFeatures(Features)) {
      CmdArgs.push_back(IsAux ? "-aux-target-feature" : "-target-feature");
      CmdArgs.push_back(Feature.data());
    }
  }
  
  static bool
  shouldUseExceptionTablesForObjCExceptions(const ObjCRuntime &runtime,
                                            const llvm::Triple &Triple) {
    // We use the zero-cost exception tables for Objective-C if the non-fragile
    // ABI is enabled or when compiling for x86_64 and ARM on Snow Leopard and
    // later.
    if (runtime.isNonFragile())
      return true;
  
    if (!Triple.isMacOSX())
      return false;
  
    return (!Triple.isMacOSXVersionLT(10, 5) &&
            (Triple.getArch() == llvm::Triple::x86_64 ||
             Triple.getArch() == llvm::Triple::arm));
  }
  
  /// Adds exception related arguments to the driver command arguments. There's a
  /// master flag, -fexceptions and also language specific flags to enable/disable
  /// C++ and Objective-C exceptions. This makes it possible to for example
  /// disable C++ exceptions but enable Objective-C exceptions.
  static bool addExceptionArgs(const ArgList &Args, types::ID InputType,
                               const ToolChain &TC, bool KernelOrKext,
                               const ObjCRuntime &objcRuntime,
                               ArgStringList &CmdArgs) {
    const llvm::Triple &Triple = TC.getTriple();
  
    if (KernelOrKext) {
      // -mkernel and -fapple-kext imply no exceptions, so claim exception related
      // arguments now to avoid warnings about unused arguments.
      Args.ClaimAllArgs(options::OPT_fexceptions);
      Args.ClaimAllArgs(options::OPT_fno_exceptions);
      Args.ClaimAllArgs(options::OPT_fobjc_exceptions);
      Args.ClaimAllArgs(options::OPT_fno_objc_exceptions);
      Args.ClaimAllArgs(options::OPT_fcxx_exceptions);
      Args.ClaimAllArgs(options::OPT_fno_cxx_exceptions);
      Args.ClaimAllArgs(options::OPT_fasync_exceptions);
      Args.ClaimAllArgs(options::OPT_fno_async_exceptions);
      return false;
    }
  
    // See if the user explicitly enabled exceptions.
    bool EH = Args.hasFlag(options::OPT_fexceptions, options::OPT_fno_exceptions,
                           false);
  
    bool EHa = Args.hasFlag(options::OPT_fasync_exceptions,
                            options::OPT_fno_async_exceptions, false);
    if (EHa) {
      CmdArgs.push_back("-fasync-exceptions");
      EH = true;
    }
  
    // Obj-C exceptions are enabled by default, regardless of -fexceptions. This
    // is not necessarily sensible, but follows GCC.
    if (types::isObjC(InputType) &&
        Args.hasFlag(options::OPT_fobjc_exceptions,
                     options::OPT_fno_objc_exceptions, true)) {
      CmdArgs.push_back("-fobjc-exceptions");
  
      EH |= shouldUseExceptionTablesForObjCExceptions(objcRuntime, Triple);
    }
  
    if (types::isCXX(InputType)) {
      // Disable C++ EH by default on XCore and PS4.
      bool CXXExceptionsEnabled =
          Triple.getArch() != llvm::Triple::xcore && !Triple.isPS4CPU();
      Arg *ExceptionArg = Args.getLastArg(
          options::OPT_fcxx_exceptions, options::OPT_fno_cxx_exceptions,
          options::OPT_fexceptions, options::OPT_fno_exceptions);
      if (ExceptionArg)
        CXXExceptionsEnabled =
            ExceptionArg->getOption().matches(options::OPT_fcxx_exceptions) ||
            ExceptionArg->getOption().matches(options::OPT_fexceptions);
  
      if (CXXExceptionsEnabled) {
        CmdArgs.push_back("-fcxx-exceptions");
  
        EH = true;
      }
    }
  
    // OPT_fignore_exceptions means exception could still be thrown,
    // but no clean up or catch would happen in current module.
    // So we do not set EH to false.
    Args.AddLastArg(CmdArgs, options::OPT_fignore_exceptions);
  
    if (EH)
      CmdArgs.push_back("-fexceptions");
    return EH;
  }
  
  static bool ShouldEnableAutolink(const ArgList &Args, const ToolChain &TC,
                                   const JobAction &JA) {
    bool Default = true;
    if (TC.getTriple().isOSDarwin()) {
      // The native darwin assembler doesn't support the linker_option directives,
      // so we disable them if we think the .s file will be passed to it.
      Default = TC.useIntegratedAs();
    }
    // The linker_option directives are intended for host compilation.
    if (JA.isDeviceOffloading(Action::OFK_Cuda) ||
        JA.isDeviceOffloading(Action::OFK_HIP))
      Default = false;
    return Args.hasFlag(options::OPT_fautolink, options::OPT_fno_autolink,
                        Default);
  }
  
  static bool ShouldDisableDwarfDirectory(const ArgList &Args,
                                          const ToolChain &TC) {
    bool UseDwarfDirectory =
        Args.hasFlag(options::OPT_fdwarf_directory_asm,
                     options::OPT_fno_dwarf_directory_asm, TC.useIntegratedAs());
    return !UseDwarfDirectory;
  }
  
  // Convert an arg of the form "-gN" or "-ggdbN" or one of their aliases
  // to the corresponding DebugInfoKind.
  static codegenoptions::DebugInfoKind DebugLevelToInfoKind(const Arg &A) {
    assert(A.getOption().matches(options::OPT_gN_Group) &&
           "Not a -g option that specifies a debug-info level");
    if (A.getOption().matches(options::OPT_g0) ||
        A.getOption().matches(options::OPT_ggdb0))
      return codegenoptions::NoDebugInfo;
    if (A.getOption().matches(options::OPT_gline_tables_only) ||
        A.getOption().matches(options::OPT_ggdb1))
      return codegenoptions::DebugLineTablesOnly;
    if (A.getOption().matches(options::OPT_gline_directives_only))
      return codegenoptions::DebugDirectivesOnly;
    return codegenoptions::LimitedDebugInfo;
  }
  
  static bool mustUseNonLeafFramePointerForTarget(const llvm::Triple &Triple) {
    switch (Triple.getArch()){
    default:
      return false;
    case llvm::Triple::arm:
    case llvm::Triple::thumb:
      // ARM Darwin targets require a frame pointer to be always present to aid
      // offline debugging via backtraces.
      return Triple.isOSDarwin();
    }
  }
  
  static bool useFramePointerForTargetByDefault(const ArgList &Args,
                                                const llvm::Triple &Triple) {
    if (Args.hasArg(options::OPT_pg) && !Args.hasArg(options::OPT_mfentry))
      return true;
  
    switch (Triple.getArch()) {
    case llvm::Triple::xcore:
    case llvm::Triple::wasm32:
    case llvm::Triple::wasm64:
    case llvm::Triple::msp430:
      // XCore never wants frame pointers, regardless of OS.
      // WebAssembly never wants frame pointers.
      return false;
    case llvm::Triple::ppc:
    case llvm::Triple::ppcle:
    case llvm::Triple::ppc64:
    case llvm::Triple::ppc64le:
    case llvm::Triple::riscv32:
    case llvm::Triple::riscv64:
    case llvm::Triple::amdgcn:
    case llvm::Triple::r600:
      return !areOptimizationsEnabled(Args);
    default:
      break;
    }
  
    if (Triple.isOSNetBSD()) {
      return !areOptimizationsEnabled(Args);
    }
  
    if (Triple.isOSLinux() || Triple.getOS() == llvm::Triple::CloudABI ||
        Triple.isOSHurd()) {
      switch (Triple.getArch()) {
      // Don't use a frame pointer on linux if optimizing for certain targets.
      case llvm::Triple::arm:
      case llvm::Triple::armeb:
      case llvm::Triple::thumb:
      case llvm::Triple::thumbeb:
        if (Triple.isAndroid())
          return true;
        LLVM_FALLTHROUGH;
      case llvm::Triple::mips64:
      case llvm::Triple::mips64el:
      case llvm::Triple::mips:
      case llvm::Triple::mipsel:
      case llvm::Triple::systemz:
      case llvm::Triple::x86:
      case llvm::Triple::x86_64:
        return !areOptimizationsEnabled(Args);
      default:
        return true;
      }
    }
  
    if (Triple.isOSWindows()) {
      switch (Triple.getArch()) {
      case llvm::Triple::x86:
        return !areOptimizationsEnabled(Args);
      case llvm::Triple::x86_64:
        return Triple.isOSBinFormatMachO();
      case llvm::Triple::arm:
      case llvm::Triple::thumb:
        // Windows on ARM builds with FPO disabled to aid fast stack walking
        return true;
      default:
        // All other supported Windows ISAs use xdata unwind information, so frame
        // pointers are not generally useful.
        return false;
      }
    }
  
    return true;
  }
  
  static CodeGenOptions::FramePointerKind
  getFramePointerKind(const ArgList &Args, const llvm::Triple &Triple) {
    // We have 4 states:
    //
    //  00) leaf retained, non-leaf retained
    //  01) leaf retained, non-leaf omitted (this is invalid)
    //  10) leaf omitted, non-leaf retained
    //      (what -momit-leaf-frame-pointer was designed for)
    //  11) leaf omitted, non-leaf omitted
    //
    //  "omit" options taking precedence over "no-omit" options is the only way
    //  to make 3 valid states representable
    Arg *A = Args.getLastArg(options::OPT_fomit_frame_pointer,
                             options::OPT_fno_omit_frame_pointer);
    bool OmitFP = A && A->getOption().matches(options::OPT_fomit_frame_pointer);
    bool NoOmitFP =
        A && A->getOption().matches(options::OPT_fno_omit_frame_pointer);
    bool OmitLeafFP = Args.hasFlag(options::OPT_momit_leaf_frame_pointer,
                                   options::OPT_mno_omit_leaf_frame_pointer,
                                   Triple.isAArch64() || Triple.isPS4CPU());
    if (NoOmitFP || mustUseNonLeafFramePointerForTarget(Triple) ||
        (!OmitFP && useFramePointerForTargetByDefault(Args, Triple))) {
      if (OmitLeafFP)
        return CodeGenOptions::FramePointerKind::NonLeaf;
      return CodeGenOptions::FramePointerKind::All;
    }
    return CodeGenOptions::FramePointerKind::None;
  }
  
  /// Add a CC1 option to specify the debug compilation directory.
  static void addDebugCompDirArg(const ArgList &Args, ArgStringList &CmdArgs,
                                 const llvm::vfs::FileSystem &VFS) {
    if (Arg *A = Args.getLastArg(options::OPT_ffile_compilation_dir_EQ,
                                 options::OPT_fdebug_compilation_dir_EQ)) {
      if (A->getOption().matches(options::OPT_ffile_compilation_dir_EQ))
        CmdArgs.push_back(Args.MakeArgString(Twine("-fdebug-compilation-dir=") +
                                             A->getValue()));
      else
        A->render(Args, CmdArgs);
    } else if (llvm::ErrorOr<std::string> CWD =
                   VFS.getCurrentWorkingDirectory()) {
      CmdArgs.push_back(Args.MakeArgString("-fdebug-compilation-dir=" + *CWD));
    }
  }
  
  /// Add a CC1 and CC1AS option to specify the debug file path prefix map.
  static void addDebugPrefixMapArg(const Driver &D, const ArgList &Args, ArgStringList &CmdArgs) {
    for (const Arg *A : Args.filtered(options::OPT_ffile_prefix_map_EQ,
                                      options::OPT_fdebug_prefix_map_EQ)) {
      StringRef Map = A->getValue();
      if (Map.find('=') == StringRef::npos)
        D.Diag(diag::err_drv_invalid_argument_to_option)
            << Map << A->getOption().getName();
      else
        CmdArgs.push_back(Args.MakeArgString("-fdebug-prefix-map=" + Map));
      A->claim();
    }
  }
  
  /// Add a CC1 and CC1AS option to specify the macro file path prefix map.
  static void addMacroPrefixMapArg(const Driver &D, const ArgList &Args,
                                   ArgStringList &CmdArgs) {
    for (const Arg *A : Args.filtered(options::OPT_ffile_prefix_map_EQ,
                                      options::OPT_fmacro_prefix_map_EQ)) {
      StringRef Map = A->getValue();
      if (Map.find('=') == StringRef::npos)
        D.Diag(diag::err_drv_invalid_argument_to_option)
            << Map << A->getOption().getName();
      else
        CmdArgs.push_back(Args.MakeArgString("-fmacro-prefix-map=" + Map));
      A->claim();
    }
  }
  
  /// Add a CC1 and CC1AS option to specify the coverage file path prefix map.
  static void addCoveragePrefixMapArg(const Driver &D, const ArgList &Args,
                                     ArgStringList &CmdArgs) {
    for (const Arg *A : Args.filtered(options::OPT_ffile_prefix_map_EQ,
                                      options::OPT_fcoverage_prefix_map_EQ)) {
      StringRef Map = A->getValue();
      if (Map.find('=') == StringRef::npos)
        D.Diag(diag::err_drv_invalid_argument_to_option)
            << Map << A->getOption().getName();
      else
        CmdArgs.push_back(Args.MakeArgString("-fcoverage-prefix-map=" + Map));
      A->claim();
    }
  }
  
  /// Vectorize at all optimization levels greater than 1 except for -Oz.
  /// For -Oz the loop vectorizer is disabled, while the slp vectorizer is
  /// enabled.
  static bool shouldEnableVectorizerAtOLevel(const ArgList &Args, bool isSlpVec) {
    if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
      if (A->getOption().matches(options::OPT_O4) ||
          A->getOption().matches(options::OPT_Ofast))
        return true;
  
      if (A->getOption().matches(options::OPT_O0))
        return false;
  
      assert(A->getOption().matches(options::OPT_O) && "Must have a -O flag");
  
      // Vectorize -Os.
      StringRef S(A->getValue());
      if (S == "s")
        return true;
  
      // Don't vectorize -Oz, unless it's the slp vectorizer.
      if (S == "z")
        return isSlpVec;
  
      unsigned OptLevel = 0;
      if (S.getAsInteger(10, OptLevel))
        return false;
  
      return OptLevel > 1;
    }
  
    return false;
  }
  
  /// Add -x lang to \p CmdArgs for \p Input.
  static void addDashXForInput(const ArgList &Args, const InputInfo &Input,
                               ArgStringList &CmdArgs) {
    // When using -verify-pch, we don't want to provide the type
    // 'precompiled-header' if it was inferred from the file extension
    if (Args.hasArg(options::OPT_verify_pch) && Input.getType() == types::TY_PCH)
      return;
  
    CmdArgs.push_back("-x");
    if (Args.hasArg(options::OPT_rewrite_objc))
      CmdArgs.push_back(types::getTypeName(types::TY_PP_ObjCXX));
    else {
      // Map the driver type to the frontend type. This is mostly an identity
      // mapping, except that the distinction between module interface units
      // and other source files does not exist at the frontend layer.
      const char *ClangType;
      switch (Input.getType()) {
      case types::TY_CXXModule:
        ClangType = "c++";
        break;
      case types::TY_PP_CXXModule:
        ClangType = "c++-cpp-output";
        break;
      default:
        ClangType = types::getTypeName(Input.getType());
        break;
      }
      CmdArgs.push_back(ClangType);
    }
  }
  
  static void addPGOAndCoverageFlags(const ToolChain &TC, Compilation &C,
                                     const Driver &D, const InputInfo &Output,
                                     const ArgList &Args,
                                     ArgStringList &CmdArgs) {
  
    auto *PGOGenerateArg = Args.getLastArg(options::OPT_fprofile_generate,
                                           options::OPT_fprofile_generate_EQ,
                                           options::OPT_fno_profile_generate);
    if (PGOGenerateArg &&
        PGOGenerateArg->getOption().matches(options::OPT_fno_profile_generate))
      PGOGenerateArg = nullptr;
  
    auto *CSPGOGenerateArg = Args.getLastArg(options::OPT_fcs_profile_generate,
                                             options::OPT_fcs_profile_generate_EQ,
                                             options::OPT_fno_profile_generate);
    if (CSPGOGenerateArg &&
        CSPGOGenerateArg->getOption().matches(options::OPT_fno_profile_generate))
      CSPGOGenerateArg = nullptr;
  
    auto *ProfileGenerateArg = Args.getLastArg(
        options::OPT_fprofile_instr_generate,
        options::OPT_fprofile_instr_generate_EQ,
        options::OPT_fno_profile_instr_generate);
    if (ProfileGenerateArg &&
        ProfileGenerateArg->getOption().matches(
            options::OPT_fno_profile_instr_generate))
      ProfileGenerateArg = nullptr;
  
    if (PGOGenerateArg && ProfileGenerateArg)
      D.Diag(diag::err_drv_argument_not_allowed_with)
          << PGOGenerateArg->getSpelling() << ProfileGenerateArg->getSpelling();
  
    auto *ProfileUseArg = getLastProfileUseArg(Args);
  
    if (PGOGenerateArg && ProfileUseArg)
      D.Diag(diag::err_drv_argument_not_allowed_with)
          << ProfileUseArg->getSpelling() << PGOGenerateArg->getSpelling();
  
    if (ProfileGenerateArg && ProfileUseArg)
      D.Diag(diag::err_drv_argument_not_allowed_with)
          << ProfileGenerateArg->getSpelling() << ProfileUseArg->getSpelling();
  
    if (CSPGOGenerateArg && PGOGenerateArg) {
      D.Diag(diag::err_drv_argument_not_allowed_with)
          << CSPGOGenerateArg->getSpelling() << PGOGenerateArg->getSpelling();
      PGOGenerateArg = nullptr;
    }
  
    if (TC.getTriple().isOSAIX()) {
      if (PGOGenerateArg)
        if (!D.isUsingLTO(false /*IsDeviceOffloadAction */) ||
            D.getLTOMode() != LTOK_Full)
          D.Diag(clang::diag::err_drv_argument_only_allowed_with)
              << PGOGenerateArg->getSpelling() << "-flto";
      if (ProfileGenerateArg)
        D.Diag(diag::err_drv_unsupported_opt_for_target)
            << ProfileGenerateArg->getSpelling() << TC.getTriple().str();
      if (Arg *ProfileSampleUseArg = getLastProfileSampleUseArg(Args))
        D.Diag(diag::err_drv_unsupported_opt_for_target)
            << ProfileSampleUseArg->getSpelling() << TC.getTriple().str();
    }
  
    if (ProfileGenerateArg) {
      if (ProfileGenerateArg->getOption().matches(
              options::OPT_fprofile_instr_generate_EQ))
        CmdArgs.push_back(Args.MakeArgString(Twine("-fprofile-instrument-path=") +
                                             ProfileGenerateArg->getValue()));
      // The default is to use Clang Instrumentation.
      CmdArgs.push_back("-fprofile-instrument=clang");
      if (TC.getTriple().isWindowsMSVCEnvironment()) {
        // Add dependent lib for clang_rt.profile
        CmdArgs.push_back(Args.MakeArgString(
            "--dependent-lib=" + TC.getCompilerRTBasename(Args, "profile")));
      }
    }
  
    Arg *PGOGenArg = nullptr;
    if (PGOGenerateArg) {
      assert(!CSPGOGenerateArg);
      PGOGenArg = PGOGenerateArg;
      CmdArgs.push_back("-fprofile-instrument=llvm");
    }
    if (CSPGOGenerateArg) {
      assert(!PGOGenerateArg);
      PGOGenArg = CSPGOGenerateArg;
      CmdArgs.push_back("-fprofile-instrument=csllvm");
    }
    if (PGOGenArg) {
      if (TC.getTriple().isWindowsMSVCEnvironment()) {
        // Add dependent lib for clang_rt.profile
        CmdArgs.push_back(Args.MakeArgString(
            "--dependent-lib=" + TC.getCompilerRTBasename(Args, "profile")));
      }
      if (PGOGenArg->getOption().matches(
              PGOGenerateArg ? options::OPT_fprofile_generate_EQ
                             : options::OPT_fcs_profile_generate_EQ)) {
        SmallString<128> Path(PGOGenArg->getValue());
        llvm::sys::path::append(Path, "default_%m.profraw");
        CmdArgs.push_back(
            Args.MakeArgString(Twine("-fprofile-instrument-path=") + Path));
      }
    }
  
    if (ProfileUseArg) {
      if (ProfileUseArg->getOption().matches(options::OPT_fprofile_instr_use_EQ))
        CmdArgs.push_back(Args.MakeArgString(
            Twine("-fprofile-instrument-use-path=") + ProfileUseArg->getValue()));
      else if ((ProfileUseArg->getOption().matches(
                    options::OPT_fprofile_use_EQ) ||
                ProfileUseArg->getOption().matches(
                    options::OPT_fprofile_instr_use))) {
        SmallString<128> Path(
            ProfileUseArg->getNumValues() == 0 ? "" : ProfileUseArg->getValue());
        if (Path.empty() || llvm::sys::fs::is_directory(Path))
          llvm::sys::path::append(Path, "default.profdata");
        CmdArgs.push_back(
            Args.MakeArgString(Twine("-fprofile-instrument-use-path=") + Path));
      }
    }
  
    bool EmitCovNotes = Args.hasFlag(options::OPT_ftest_coverage,
                                     options::OPT_fno_test_coverage, false) ||
                        Args.hasArg(options::OPT_coverage);
    bool EmitCovData = TC.needsGCovInstrumentation(Args);
    if (EmitCovNotes)
      CmdArgs.push_back("-ftest-coverage");
    if (EmitCovData)
      CmdArgs.push_back("-fprofile-arcs");
  
    if (Args.hasFlag(options::OPT_fcoverage_mapping,
                     options::OPT_fno_coverage_mapping, false)) {
      if (!ProfileGenerateArg)
        D.Diag(clang::diag::err_drv_argument_only_allowed_with)
            << "-fcoverage-mapping"
            << "-fprofile-instr-generate";
  
      CmdArgs.push_back("-fcoverage-mapping");
    }
  
    if (Arg *A = Args.getLastArg(options::OPT_ffile_compilation_dir_EQ,
                                 options::OPT_fcoverage_compilation_dir_EQ)) {
      if (A->getOption().matches(options::OPT_ffile_compilation_dir_EQ))
        CmdArgs.push_back(Args.MakeArgString(
            Twine("-fcoverage-compilation-dir=") + A->getValue()));
      else
        A->render(Args, CmdArgs);
    } else if (llvm::ErrorOr<std::string> CWD =
                   D.getVFS().getCurrentWorkingDirectory()) {
      CmdArgs.push_back(Args.MakeArgString("-fcoverage-compilation-dir=" + *CWD));
    }
  
    if (Args.hasArg(options::OPT_fprofile_exclude_files_EQ)) {
      auto *Arg = Args.getLastArg(options::OPT_fprofile_exclude_files_EQ);
      if (!Args.hasArg(options::OPT_coverage))
        D.Diag(clang::diag::err_drv_argument_only_allowed_with)
            << "-fprofile-exclude-files="
            << "--coverage";
  
      StringRef v = Arg->getValue();
      CmdArgs.push_back(
          Args.MakeArgString(Twine("-fprofile-exclude-files=" + v)));
    }
  
    if (Args.hasArg(options::OPT_fprofile_filter_files_EQ)) {
      auto *Arg = Args.getLastArg(options::OPT_fprofile_filter_files_EQ);
      if (!Args.hasArg(options::OPT_coverage))
        D.Diag(clang::diag::err_drv_argument_only_allowed_with)
            << "-fprofile-filter-files="
            << "--coverage";
  
      StringRef v = Arg->getValue();
      CmdArgs.push_back(Args.MakeArgString(Twine("-fprofile-filter-files=" + v)));
    }
  
    if (const auto *A = Args.getLastArg(options::OPT_fprofile_update_EQ)) {
      StringRef Val = A->getValue();
      if (Val == "atomic" || Val == "prefer-atomic")
        CmdArgs.push_back("-fprofile-update=atomic");
      else if (Val != "single")
        D.Diag(diag::err_drv_unsupported_option_argument)
            << A->getOption().getName() << Val;
    } else if (TC.getSanitizerArgs().needsTsanRt()) {
      CmdArgs.push_back("-fprofile-update=atomic");
    }
  
    // Leave -fprofile-dir= an unused argument unless .gcda emission is
    // enabled. To be polite, with '-fprofile-arcs -fno-profile-arcs' consider
    // the flag used. There is no -fno-profile-dir, so the user has no
    // targeted way to suppress the warning.
    Arg *FProfileDir = nullptr;
    if (Args.hasArg(options::OPT_fprofile_arcs) ||
        Args.hasArg(options::OPT_coverage))
      FProfileDir = Args.getLastArg(options::OPT_fprofile_dir);
  
    // Put the .gcno and .gcda files (if needed) next to the object file or
    // bitcode file in the case of LTO.
    // FIXME: There should be a simpler way to find the object file for this
    // input, and this code probably does the wrong thing for commands that
    // compile and link all at once.
    if ((Args.hasArg(options::OPT_c) || Args.hasArg(options::OPT_S)) &&
        (EmitCovNotes || EmitCovData) && Output.isFilename()) {
      SmallString<128> OutputFilename;
      if (Arg *FinalOutput = C.getArgs().getLastArg(options::OPT__SLASH_Fo))
        OutputFilename = FinalOutput->getValue();
      else if (Arg *FinalOutput = C.getArgs().getLastArg(options::OPT_o))
        OutputFilename = FinalOutput->getValue();
      else
        OutputFilename = llvm::sys::path::filename(Output.getBaseInput());
      SmallString<128> CoverageFilename = OutputFilename;
      if (llvm::sys::path::is_relative(CoverageFilename))
        (void)D.getVFS().makeAbsolute(CoverageFilename);
      llvm::sys::path::replace_extension(CoverageFilename, "gcno");
  
      CmdArgs.push_back("-coverage-notes-file");
      CmdArgs.push_back(Args.MakeArgString(CoverageFilename));
  
      if (EmitCovData) {
        if (FProfileDir) {
          CoverageFilename = FProfileDir->getValue();
          llvm::sys::path::append(CoverageFilename, OutputFilename);
        }
        llvm::sys::path::replace_extension(CoverageFilename, "gcda");
        CmdArgs.push_back("-coverage-data-file");
        CmdArgs.push_back(Args.MakeArgString(CoverageFilename));
      }
    }
  }
  
  /// Check whether the given input tree contains any compilation actions.
  static bool ContainsCompileAction(const Action *A) {
    if (isa<CompileJobAction>(A) || isa<BackendJobAction>(A))
      return true;
  
    for (const auto &AI : A->inputs())
      if (ContainsCompileAction(AI))
        return true;
  
    return false;
  }
  
  /// Check if -relax-all should be passed to the internal assembler.
  /// This is done by default when compiling non-assembler source with -O0.
  static bool UseRelaxAll(Compilation &C, const ArgList &Args) {
    bool RelaxDefault = true;
  
    if (Arg *A = Args.getLastArg(options::OPT_O_Group))
      RelaxDefault = A->getOption().matches(options::OPT_O0);
  
    if (RelaxDefault) {
      RelaxDefault = false;
      for (const auto &Act : C.getActions()) {
        if (ContainsCompileAction(Act)) {
          RelaxDefault = true;
          break;
        }
      }
    }
  
    return Args.hasFlag(options::OPT_mrelax_all, options::OPT_mno_relax_all,
                        RelaxDefault);
  }
  
  // Extract the integer N from a string spelled "-dwarf-N", returning 0
  // on mismatch. The StringRef input (rather than an Arg) allows
  // for use by the "-Xassembler" option parser.
  static unsigned DwarfVersionNum(StringRef ArgValue) {
    return llvm::StringSwitch<unsigned>(ArgValue)
        .Case("-gdwarf-2", 2)
        .Case("-gdwarf-3", 3)
        .Case("-gdwarf-4", 4)
        .Case("-gdwarf-5", 5)
        .Default(0);
  }
  
  // Find a DWARF format version option.
  // This function is a complementary for DwarfVersionNum().
  static const Arg *getDwarfNArg(const ArgList &Args) {
    return Args.getLastArg(options::OPT_gdwarf_2, options::OPT_gdwarf_3,
                           options::OPT_gdwarf_4, options::OPT_gdwarf_5,
                           options::OPT_gdwarf);
  }
  
  static void RenderDebugEnablingArgs(const ArgList &Args, ArgStringList &CmdArgs,
                                      codegenoptions::DebugInfoKind DebugInfoKind,
                                      unsigned DwarfVersion,
                                      llvm::DebuggerKind DebuggerTuning) {
    switch (DebugInfoKind) {
    case codegenoptions::DebugDirectivesOnly:
      CmdArgs.push_back("-debug-info-kind=line-directives-only");
      break;
    case codegenoptions::DebugLineTablesOnly:
      CmdArgs.push_back("-debug-info-kind=line-tables-only");
      break;
    case codegenoptions::DebugInfoConstructor:
      CmdArgs.push_back("-debug-info-kind=constructor");
      break;
    case codegenoptions::LimitedDebugInfo:
      CmdArgs.push_back("-debug-info-kind=limited");
      break;
    case codegenoptions::FullDebugInfo:
      CmdArgs.push_back("-debug-info-kind=standalone");
      break;
    case codegenoptions::UnusedTypeInfo:
      CmdArgs.push_back("-debug-info-kind=unused-types");
      break;
    default:
      break;
    }
    if (DwarfVersion > 0)
      CmdArgs.push_back(
          Args.MakeArgString("-dwarf-version=" + Twine(DwarfVersion)));
    switch (DebuggerTuning) {
    case llvm::DebuggerKind::GDB:
      CmdArgs.push_back("-debugger-tuning=gdb");
      break;
    case llvm::DebuggerKind::LLDB:
      CmdArgs.push_back("-debugger-tuning=lldb");
      break;
    case llvm::DebuggerKind::SCE:
      CmdArgs.push_back("-debugger-tuning=sce");
      break;
    case llvm::DebuggerKind::DBX:
      CmdArgs.push_back("-debugger-tuning=dbx");
      break;
    default:
      break;
    }
  }
  
  static bool checkDebugInfoOption(const Arg *A, const ArgList &Args,
                                   const Driver &D, const ToolChain &TC) {
    assert(A && "Expected non-nullptr argument.");
    if (TC.supportsDebugInfoOption(A))
      return true;
    D.Diag(diag::warn_drv_unsupported_debug_info_opt_for_target)
        << A->getAsString(Args) << TC.getTripleString();
    return false;
  }
  
  static void RenderDebugInfoCompressionArgs(const ArgList &Args,
                                             ArgStringList &CmdArgs,
                                             const Driver &D,
                                             const ToolChain &TC) {
    const Arg *A = Args.getLastArg(options::OPT_gz_EQ);
    if (!A)
      return;
    if (checkDebugInfoOption(A, Args, D, TC)) {
      StringRef Value = A->getValue();
      if (Value == "none") {
        CmdArgs.push_back("--compress-debug-sections=none");
      } else if (Value == "zlib" || Value == "zlib-gnu") {
        if (llvm::zlib::isAvailable()) {
          CmdArgs.push_back(
              Args.MakeArgString("--compress-debug-sections=" + Twine(Value)));
        } else {
          D.Diag(diag::warn_debug_compression_unavailable);
        }
      } else {
        D.Diag(diag::err_drv_unsupported_option_argument)
            << A->getOption().getName() << Value;
      }
    }
  }
  
  static const char *RelocationModelName(llvm::Reloc::Model Model) {
    switch (Model) {
    case llvm::Reloc::Static:
      return "static";
    case llvm::Reloc::PIC_:
      return "pic";
    case llvm::Reloc::DynamicNoPIC:
      return "dynamic-no-pic";
    case llvm::Reloc::ROPI:
      return "ropi";
    case llvm::Reloc::RWPI:
      return "rwpi";
    case llvm::Reloc::ROPI_RWPI:
      return "ropi-rwpi";
    }
    llvm_unreachable("Unknown Reloc::Model kind");
  }
  static void handleAMDGPUCodeObjectVersionOptions(const Driver &D,
                                                   const ArgList &Args,
                                                   ArgStringList &CmdArgs) {
    // If no version was requested by the user, use the default value from the
    // back end. This is consistent with the value returned from
    // getAMDGPUCodeObjectVersion. This lets clang emit IR for amdgpu without
    // requiring the corresponding llvm to have the AMDGPU target enabled,
    // provided the user (e.g. front end tests) can use the default.
    if (haveAMDGPUCodeObjectVersionArgument(D, Args)) {
      unsigned CodeObjVer = getAMDGPUCodeObjectVersion(D, Args);
      CmdArgs.insert(CmdArgs.begin() + 1,
                     Args.MakeArgString(Twine("--amdhsa-code-object-version=") +
                                        Twine(CodeObjVer)));
      CmdArgs.insert(CmdArgs.begin() + 1, "-mllvm");
    }
  }
  
  void Clang::AddPreprocessingOptions(Compilation &C, const JobAction &JA,
                                      const Driver &D, const ArgList &Args,
                                      ArgStringList &CmdArgs,
                                      const InputInfo &Output,
                                      const InputInfoList &Inputs) const {
    const bool IsIAMCU = getToolChain().getTriple().isOSIAMCU();
  
    CheckPreprocessingOptions(D, Args);
  
    Args.AddLastArg(CmdArgs, options::OPT_C);
    Args.AddLastArg(CmdArgs, options::OPT_CC);
  
    // Handle dependency file generation.
    Arg *ArgM = Args.getLastArg(options::OPT_MM);
    if (!ArgM)
      ArgM = Args.getLastArg(options::OPT_M);
    Arg *ArgMD = Args.getLastArg(options::OPT_MMD);
    if (!ArgMD)
      ArgMD = Args.getLastArg(options::OPT_MD);
  
    // -M and -MM imply -w.
    if (ArgM)
      CmdArgs.push_back("-w");
    else
      ArgM = ArgMD;
  
    if (ArgM) {
      // Determine the output location.
      const char *DepFile;
      if (Arg *MF = Args.getLastArg(options::OPT_MF)) {
        DepFile = MF->getValue();
        C.addFailureResultFile(DepFile, &JA);
      } else if (Output.getType() == types::TY_Dependencies) {
        DepFile = Output.getFilename();
      } else if (!ArgMD) {
        DepFile = "-";
      } else {
        DepFile = getDependencyFileName(Args, Inputs);
        C.addFailureResultFile(DepFile, &JA);
      }
      CmdArgs.push_back("-dependency-file");
      CmdArgs.push_back(DepFile);
      CmdArgs.push_back("-skip-unused-modulemap-deps");
  
      bool HasTarget = false;
      for (const Arg *A : Args.filtered(options::OPT_MT, options::OPT_MQ)) {
        HasTarget = true;
        A->claim();
        if (A->getOption().matches(options::OPT_MT)) {
          A->render(Args, CmdArgs);
        } else {
          CmdArgs.push_back("-MT");
          SmallString<128> Quoted;
          QuoteTarget(A->getValue(), Quoted);
          CmdArgs.push_back(Args.MakeArgString(Quoted));
        }
      }
  
      // Add a default target if one wasn't specified.
      if (!HasTarget) {
        const char *DepTarget;
  
        // If user provided -o, that is the dependency target, except
        // when we are only generating a dependency file.
        Arg *OutputOpt = Args.getLastArg(options::OPT_o);
        if (OutputOpt && Output.getType() != types::TY_Dependencies) {
          DepTarget = OutputOpt->getValue();
        } else {
          // Otherwise derive from the base input.
          //
          // FIXME: This should use the computed output file location.
          SmallString<128> P(Inputs[0].getBaseInput());
          llvm::sys::path::replace_extension(P, "o");
          DepTarget = Args.MakeArgString(llvm::sys::path::filename(P));
        }
  
        CmdArgs.push_back("-MT");
        SmallString<128> Quoted;
        QuoteTarget(DepTarget, Quoted);
        CmdArgs.push_back(Args.MakeArgString(Quoted));
      }
  
      if (ArgM->getOption().matches(options::OPT_M) ||
          ArgM->getOption().matches(options::OPT_MD))
        CmdArgs.push_back("-sys-header-deps");
      if ((isa<PrecompileJobAction>(JA) &&
           !Args.hasArg(options::OPT_fno_module_file_deps)) ||
          Args.hasArg(options::OPT_fmodule_file_deps))
        CmdArgs.push_back("-module-file-deps");
    }
  
    if (Args.hasArg(options::OPT_MG)) {
      if (!ArgM || ArgM->getOption().matches(options::OPT_MD) ||
          ArgM->getOption().matches(options::OPT_MMD))
        D.Diag(diag::err_drv_mg_requires_m_or_mm);
      CmdArgs.push_back("-MG");
    }
  
    Args.AddLastArg(CmdArgs, options::OPT_MP);
    Args.AddLastArg(CmdArgs, options::OPT_MV);
  
    // Add offload include arguments specific for CUDA/HIP.  This must happen
    // before we -I or -include anything else, because we must pick up the
    // CUDA/HIP headers from the particular CUDA/ROCm installation, rather than
    // from e.g. /usr/local/include.
    if (JA.isOffloading(Action::OFK_Cuda))
      getToolChain().AddCudaIncludeArgs(Args, CmdArgs);
    if (JA.isOffloading(Action::OFK_HIP))
      getToolChain().AddHIPIncludeArgs(Args, CmdArgs);
  
    // If we are offloading to a target via OpenMP we need to include the
    // openmp_wrappers folder which contains alternative system headers.
    if (JA.isDeviceOffloading(Action::OFK_OpenMP) &&
        getToolChain().getTriple().isNVPTX()){
      if (!Args.hasArg(options::OPT_nobuiltininc)) {
        // Add openmp_wrappers/* to our system include path.  This lets us wrap
        // standard library headers.
        SmallString<128> P(D.ResourceDir);
        llvm::sys::path::append(P, "include");
        llvm::sys::path::append(P, "openmp_wrappers");
        CmdArgs.push_back("-internal-isystem");
        CmdArgs.push_back(Args.MakeArgString(P));
      }
  
      CmdArgs.push_back("-include");
      CmdArgs.push_back("__clang_openmp_device_functions.h");
    }
  
    // Add -i* options, and automatically translate to
    // -include-pch/-include-pth for transparent PCH support. It's
    // wonky, but we include looking for .gch so we can support seamless
    // replacement into a build system already set up to be generating
    // .gch files.
  
    if (getToolChain().getDriver().IsCLMode()) {
      const Arg *YcArg = Args.getLastArg(options::OPT__SLASH_Yc);
      const Arg *YuArg = Args.getLastArg(options::OPT__SLASH_Yu);
      if (YcArg && JA.getKind() >= Action::PrecompileJobClass &&
          JA.getKind() <= Action::AssembleJobClass) {
        CmdArgs.push_back(Args.MakeArgString("-building-pch-with-obj"));
        // -fpch-instantiate-templates is the default when creating
        // precomp using /Yc
        if (Args.hasFlag(options::OPT_fpch_instantiate_templates,
                         options::OPT_fno_pch_instantiate_templates, true))
          CmdArgs.push_back(Args.MakeArgString("-fpch-instantiate-templates"));
      }
      if (YcArg || YuArg) {
        StringRef ThroughHeader = YcArg ? YcArg->getValue() : YuArg->getValue();
        if (!isa<PrecompileJobAction>(JA)) {
          CmdArgs.push_back("-include-pch");
          CmdArgs.push_back(Args.MakeArgString(D.GetClPchPath(
              C, !ThroughHeader.empty()
                     ? ThroughHeader
                     : llvm::sys::path::filename(Inputs[0].getBaseInput()))));
        }
  
        if (ThroughHeader.empty()) {
          CmdArgs.push_back(Args.MakeArgString(
              Twine("-pch-through-hdrstop-") + (YcArg ? "create" : "use")));
        } else {
          CmdArgs.push_back(
              Args.MakeArgString(Twine("-pch-through-header=") + ThroughHeader));
        }
      }
    }
  
    bool RenderedImplicitInclude = false;
    for (const Arg *A : Args.filtered(options::OPT_clang_i_Group)) {
      if (A->getOption().matches(options::OPT_include)) {
        // Handling of gcc-style gch precompiled headers.
        bool IsFirstImplicitInclude = !RenderedImplicitInclude;
        RenderedImplicitInclude = true;
  
        bool FoundPCH = false;
        SmallString<128> P(A->getValue());
        // We want the files to have a name like foo.h.pch. Add a dummy extension
        // so that replace_extension does the right thing.
        P += ".dummy";
        llvm::sys::path::replace_extension(P, "pch");
        if (llvm::sys::fs::exists(P))
          FoundPCH = true;
  
        if (!FoundPCH) {
          llvm::sys::path::replace_extension(P, "gch");
          if (llvm::sys::fs::exists(P)) {
            FoundPCH = true;
          }
        }
  
        if (FoundPCH) {
          if (IsFirstImplicitInclude) {
            A->claim();
            CmdArgs.push_back("-include-pch");
            CmdArgs.push_back(Args.MakeArgString(P));
            continue;
          } else {
            // Ignore the PCH if not first on command line and emit warning.
            D.Diag(diag::warn_drv_pch_not_first_include) << P
                                                         << A->getAsString(Args);
          }
        }
      } else if (A->getOption().matches(options::OPT_isystem_after)) {
        // Handling of paths which must come late.  These entries are handled by
        // the toolchain itself after the resource dir is inserted in the right
        // search order.
        // Do not claim the argument so that the use of the argument does not
        // silently go unnoticed on toolchains which do not honour the option.
        continue;
      } else if (A->getOption().matches(options::OPT_stdlibxx_isystem)) {
        // Translated to -internal-isystem by the driver, no need to pass to cc1.
        continue;
      }
  
      // Not translated, render as usual.
      A->claim();
      A->render(Args, CmdArgs);
    }
  
    Args.AddAllArgs(CmdArgs,
                    {options::OPT_D, options::OPT_U, options::OPT_I_Group,
                     options::OPT_F, options::OPT_index_header_map});
  
    // Add -Wp, and -Xpreprocessor if using the preprocessor.
  
    // FIXME: There is a very unfortunate problem here, some troubled
    // souls abuse -Wp, to pass preprocessor options in gcc syntax. To
    // really support that we would have to parse and then translate
    // those options. :(
    Args.AddAllArgValues(CmdArgs, options::OPT_Wp_COMMA,
                         options::OPT_Xpreprocessor);
  
    // -I- is a deprecated GCC feature, reject it.
    if (Arg *A = Args.getLastArg(options::OPT_I_))
      D.Diag(diag::err_drv_I_dash_not_supported) << A->getAsString(Args);
  
    // If we have a --sysroot, and don't have an explicit -isysroot flag, add an
    // -isysroot to the CC1 invocation.
    StringRef sysroot = C.getSysRoot();
    if (sysroot != "") {
      if (!Args.hasArg(options::OPT_isysroot)) {
        CmdArgs.push_back("-isysroot");
        CmdArgs.push_back(C.getArgs().MakeArgString(sysroot));
      }
    }
  
    // Parse additional include paths from environment variables.
    // FIXME: We should probably sink the logic for handling these from the
    // frontend into the driver. It will allow deleting 4 otherwise unused flags.
    // CPATH - included following the user specified includes (but prior to
    // builtin and standard includes).
    addDirectoryList(Args, CmdArgs, "-I", "CPATH");
    // C_INCLUDE_PATH - system includes enabled when compiling C.
    addDirectoryList(Args, CmdArgs, "-c-isystem", "C_INCLUDE_PATH");
    // CPLUS_INCLUDE_PATH - system includes enabled when compiling C++.
    addDirectoryList(Args, CmdArgs, "-cxx-isystem", "CPLUS_INCLUDE_PATH");
    // OBJC_INCLUDE_PATH - system includes enabled when compiling ObjC.
    addDirectoryList(Args, CmdArgs, "-objc-isystem", "OBJC_INCLUDE_PATH");
    // OBJCPLUS_INCLUDE_PATH - system includes enabled when compiling ObjC++.
    addDirectoryList(Args, CmdArgs, "-objcxx-isystem", "OBJCPLUS_INCLUDE_PATH");
  
    // While adding the include arguments, we also attempt to retrieve the
    // arguments of related offloading toolchains or arguments that are specific
    // of an offloading programming model.
  
    // Add C++ include arguments, if needed.
    if (types::isCXX(Inputs[0].getType())) {
      bool HasStdlibxxIsystem = Args.hasArg(options::OPT_stdlibxx_isystem);
      forAllAssociatedToolChains(
          C, JA, getToolChain(),
          [&Args, &CmdArgs, HasStdlibxxIsystem](const ToolChain &TC) {
            HasStdlibxxIsystem ? TC.AddClangCXXStdlibIsystemArgs(Args, CmdArgs)
                               : TC.AddClangCXXStdlibIncludeArgs(Args, CmdArgs);
          });
    }
  
    // Add system include arguments for all targets but IAMCU.
    if (!IsIAMCU)
      forAllAssociatedToolChains(C, JA, getToolChain(),
                                 [&Args, &CmdArgs](const ToolChain &TC) {
                                   TC.AddClangSystemIncludeArgs(Args, CmdArgs);
                                 });
    else {
      // For IAMCU add special include arguments.
      getToolChain().AddIAMCUIncludeArgs(Args, CmdArgs);
    }
  
    addMacroPrefixMapArg(D, Args, CmdArgs);
    addCoveragePrefixMapArg(D, Args, CmdArgs);
  }
  
  // FIXME: Move to target hook.
  static bool isSignedCharDefault(const llvm::Triple &Triple) {
    switch (Triple.getArch()) {
    default:
      return true;
  
    case llvm::Triple::aarch64:
    case llvm::Triple::aarch64_32:
    case llvm::Triple::aarch64_be:
    case llvm::Triple::arm:
    case llvm::Triple::armeb:
    case llvm::Triple::thumb:
    case llvm::Triple::thumbeb:
      if (Triple.isOSDarwin() || Triple.isOSWindows())
        return true;
      return false;
  
    case llvm::Triple::ppc:
    case llvm::Triple::ppc64:
      if (Triple.isOSDarwin())
        return true;
      return false;
  
    case llvm::Triple::hexagon:
    case llvm::Triple::ppcle:
    case llvm::Triple::ppc64le:
    case llvm::Triple::riscv32:
    case llvm::Triple::riscv64:
    case llvm::Triple::systemz:
    case llvm::Triple::xcore:
      return false;
    }
  }
  
  static bool hasMultipleInvocations(const llvm::Triple &Triple,
                                     const ArgList &Args) {
    // Supported only on Darwin where we invoke the compiler multiple times
    // followed by an invocation to lipo.
    if (!Triple.isOSDarwin())
      return false;
    // If more than one "-arch <arch>" is specified, we're targeting multiple
    // architectures resulting in a fat binary.
    return Args.getAllArgValues(options::OPT_arch).size() > 1;
  }
  
  static bool checkRemarksOptions(const Driver &D, const ArgList &Args,
                                  const llvm::Triple &Triple) {
    // When enabling remarks, we need to error if:
    // * The remark file is specified but we're targeting multiple architectures,
    // which means more than one remark file is being generated.
    bool hasMultipleInvocations = ::hasMultipleInvocations(Triple, Args);
    bool hasExplicitOutputFile =
        Args.getLastArg(options::OPT_foptimization_record_file_EQ);
    if (hasMultipleInvocations && hasExplicitOutputFile) {
      D.Diag(diag::err_drv_invalid_output_with_multiple_archs)
          << "-foptimization-record-file";
      return false;
    }
    return true;
  }
  
  static void renderRemarksOptions(const ArgList &Args, ArgStringList &CmdArgs,
                                   const llvm::Triple &Triple,
                                   const InputInfo &Input,
                                   const InputInfo &Output, const JobAction &JA) {
    StringRef Format = "yaml";
    if (const Arg *A = Args.getLastArg(options::OPT_fsave_optimization_record_EQ))
      Format = A->getValue();
  
    CmdArgs.push_back("-opt-record-file");
  
    const Arg *A = Args.getLastArg(options::OPT_foptimization_record_file_EQ);
    if (A) {
      CmdArgs.push_back(A->getValue());
    } else {
      bool hasMultipleArchs =
          Triple.isOSDarwin() && // Only supported on Darwin platforms.
          Args.getAllArgValues(options::OPT_arch).size() > 1;
  
      SmallString<128> F;
  
      if (Args.hasArg(options::OPT_c) || Args.hasArg(options::OPT_S)) {
        if (Arg *FinalOutput = Args.getLastArg(options::OPT_o))
          F = FinalOutput->getValue();
      } else {
        if (Format != "yaml" && // For YAML, keep the original behavior.
            Triple.isOSDarwin() && // Enable this only on darwin, since it's the only platform supporting .dSYM bundles.
            Output.isFilename())
          F = Output.getFilename();
      }
  
      if (F.empty()) {
        // Use the input filename.
        F = llvm::sys::path::stem(Input.getBaseInput());
  
        // If we're compiling for an offload architecture (i.e. a CUDA device),
        // we need to make the file name for the device compilation different
        // from the host compilation.
        if (!JA.isDeviceOffloading(Action::OFK_None) &&
            !JA.isDeviceOffloading(Action::OFK_Host)) {
          llvm::sys::path::replace_extension(F, "");
          F += Action::GetOffloadingFileNamePrefix(JA.getOffloadingDeviceKind(),
                                                   Triple.normalize());
          F += "-";
          F += JA.getOffloadingArch();
        }
      }
  
      // If we're having more than one "-arch", we should name the files
      // differently so that every cc1 invocation writes to a different file.
      // We're doing that by appending "-<arch>" with "<arch>" being the arch
      // name from the triple.
      if (hasMultipleArchs) {
        // First, remember the extension.
        SmallString<64> OldExtension = llvm::sys::path::extension(F);
        // then, remove it.
        llvm::sys::path::replace_extension(F, "");
        // attach -<arch> to it.
        F += "-";
        F += Triple.getArchName();
        // put back the extension.
        llvm::sys::path::replace_extension(F, OldExtension);
      }
  
      SmallString<32> Extension;
      Extension += "opt.";
      Extension += Format;
  
      llvm::sys::path::replace_extension(F, Extension);
      CmdArgs.push_back(Args.MakeArgString(F));
    }
  
    if (const Arg *A =
            Args.getLastArg(options::OPT_foptimization_record_passes_EQ)) {
      CmdArgs.push_back("-opt-record-passes");
      CmdArgs.push_back(A->getValue());
    }
  
    if (!Format.empty()) {
      CmdArgs.push_back("-opt-record-format");
      CmdArgs.push_back(Format.data());
    }
  }
  
  void AddAAPCSVolatileBitfieldArgs(const ArgList &Args, ArgStringList &CmdArgs) {
    if (!Args.hasFlag(options::OPT_faapcs_bitfield_width,
                      options::OPT_fno_aapcs_bitfield_width, true))
      CmdArgs.push_back("-fno-aapcs-bitfield-width");
  
    if (Args.getLastArg(options::OPT_ForceAAPCSBitfieldLoad))
      CmdArgs.push_back("-faapcs-bitfield-load");
  }
  
  namespace {
  void RenderARMABI(const llvm::Triple &Triple, const ArgList &Args,
                    ArgStringList &CmdArgs) {
    // Select the ABI to use.
    // FIXME: Support -meabi.
    // FIXME: Parts of this are duplicated in the backend, unify this somehow.
    const char *ABIName = nullptr;
    if (Arg *A = Args.getLastArg(options::OPT_mabi_EQ)) {
      ABIName = A->getValue();
    } else {
      std::string CPU = getCPUName(Args, Triple, /*FromAs*/ false);
      ABIName = llvm::ARM::computeDefaultTargetABI(Triple, CPU).data();
    }
  
    CmdArgs.push_back("-target-abi");
    CmdArgs.push_back(ABIName);
  }
  }
  
  void Clang::AddARMTargetArgs(const llvm::Triple &Triple, const ArgList &Args,
                               ArgStringList &CmdArgs, bool KernelOrKext) const {
    RenderARMABI(Triple, Args, CmdArgs);
  
    // Determine floating point ABI from the options & target defaults.
    arm::FloatABI ABI = arm::getARMFloatABI(getToolChain(), Args);
    if (ABI == arm::FloatABI::Soft) {
      // Floating point operations and argument passing are soft.
      // FIXME: This changes CPP defines, we need -target-soft-float.
      CmdArgs.push_back("-msoft-float");
      CmdArgs.push_back("-mfloat-abi");
      CmdArgs.push_back("soft");
    } else if (ABI == arm::FloatABI::SoftFP) {
      // Floating point operations are hard, but argument passing is soft.
      CmdArgs.push_back("-mfloat-abi");
      CmdArgs.push_back("soft");
    } else {
      // Floating point operations and argument passing are hard.
      assert(ABI == arm::FloatABI::Hard && "Invalid float abi!");
      CmdArgs.push_back("-mfloat-abi");
      CmdArgs.push_back("hard");
    }
  
    // Forward the -mglobal-merge option for explicit control over the pass.
    if (Arg *A = Args.getLastArg(options::OPT_mglobal_merge,
                                 options::OPT_mno_global_merge)) {
      CmdArgs.push_back("-mllvm");
      if (A->getOption().matches(options::OPT_mno_global_merge))
        CmdArgs.push_back("-arm-global-merge=false");
      else
        CmdArgs.push_back("-arm-global-merge=true");
    }
  
    if (!Args.hasFlag(options::OPT_mimplicit_float,
                      options::OPT_mno_implicit_float, true))
      CmdArgs.push_back("-no-implicit-float");
  
    if (Args.getLastArg(options::OPT_mcmse))
      CmdArgs.push_back("-mcmse");
  
    AddAAPCSVolatileBitfieldArgs(Args, CmdArgs);
  }
  
  void Clang::RenderTargetOptions(const llvm::Triple &EffectiveTriple,
                                  const ArgList &Args, bool KernelOrKext,
                                  ArgStringList &CmdArgs) const {
    const ToolChain &TC = getToolChain();
  
    // Add the target features
    getTargetFeatures(TC.getDriver(), EffectiveTriple, Args, CmdArgs, false);
  
    // Add target specific flags.
    switch (TC.getArch()) {
    default:
      break;
  
    case llvm::Triple::arm:
    case llvm::Triple::armeb:
    case llvm::Triple::thumb:
    case llvm::Triple::thumbeb:
      // Use the effective triple, which takes into account the deployment target.
      AddARMTargetArgs(EffectiveTriple, Args, CmdArgs, KernelOrKext);
      CmdArgs.push_back("-fallow-half-arguments-and-returns");
      break;
  
    case llvm::Triple::aarch64:
    case llvm::Triple::aarch64_32:
    case llvm::Triple::aarch64_be:
      AddAArch64TargetArgs(Args, CmdArgs);
      CmdArgs.push_back("-fallow-half-arguments-and-returns");
      break;
  
    case llvm::Triple::mips:
    case llvm::Triple::mipsel:
    case llvm::Triple::mips64:
    case llvm::Triple::mips64el:
      AddMIPSTargetArgs(Args, CmdArgs);
      break;
  
    case llvm::Triple::ppc:
    case llvm::Triple::ppcle:
    case llvm::Triple::ppc64:
    case llvm::Triple::ppc64le:
      AddPPCTargetArgs(Args, CmdArgs);
      break;
  
    case llvm::Triple::riscv32:
    case llvm::Triple::riscv64:
      AddRISCVTargetArgs(Args, CmdArgs);
      break;
  
    case llvm::Triple::sparc:
    case llvm::Triple::sparcel:
    case llvm::Triple::sparcv9:
      AddSparcTargetArgs(Args, CmdArgs);
      break;
  
    case llvm::Triple::systemz:
      AddSystemZTargetArgs(Args, CmdArgs);
      break;
  
    case llvm::Triple::x86:
    case llvm::Triple::x86_64:
      AddX86TargetArgs(Args, CmdArgs);
      break;
  
    case llvm::Triple::lanai:
      AddLanaiTargetArgs(Args, CmdArgs);
      break;
  
    case llvm::Triple::hexagon:
      AddHexagonTargetArgs(Args, CmdArgs);
      break;
  
    case llvm::Triple::wasm32:
    case llvm::Triple::wasm64:
      AddWebAssemblyTargetArgs(Args, CmdArgs);
      break;
  
    case llvm::Triple::ve:
      AddVETargetArgs(Args, CmdArgs);
      break;
    }
  }
  
  namespace {
  void RenderAArch64ABI(const llvm::Triple &Triple, const ArgList &Args,
                        ArgStringList &CmdArgs) {
    const char *ABIName = nullptr;
    if (Arg *A = Args.getLastArg(options::OPT_mabi_EQ))
      ABIName = A->getValue();
    else if (Triple.isOSDarwin())
      ABIName = "darwinpcs";
    else
      ABIName = "aapcs";
  
    CmdArgs.push_back("-target-abi");
    CmdArgs.push_back(ABIName);
  }
  }
  
  void Clang::AddAArch64TargetArgs(const ArgList &Args,
                                   ArgStringList &CmdArgs) const {
    const llvm::Triple &Triple = getToolChain().getEffectiveTriple();
  
    if (!Args.hasFlag(options::OPT_mred_zone, options::OPT_mno_red_zone, true) ||
        Args.hasArg(options::OPT_mkernel) ||
        Args.hasArg(options::OPT_fapple_kext))
      CmdArgs.push_back("-disable-red-zone");
  
    if (!Args.hasFlag(options::OPT_mimplicit_float,
                      options::OPT_mno_implicit_float, true))
      CmdArgs.push_back("-no-implicit-float");
  
    RenderAArch64ABI(Triple, Args, CmdArgs);
  
    if (Arg *A = Args.getLastArg(options::OPT_mfix_cortex_a53_835769,
                                 options::OPT_mno_fix_cortex_a53_835769)) {
      CmdArgs.push_back("-mllvm");
      if (A->getOption().matches(options::OPT_mfix_cortex_a53_835769))
        CmdArgs.push_back("-aarch64-fix-cortex-a53-835769=1");
      else
        CmdArgs.push_back("-aarch64-fix-cortex-a53-835769=0");
    } else if (Triple.isAndroid()) {
      // Enabled A53 errata (835769) workaround by default on android
      CmdArgs.push_back("-mllvm");
      CmdArgs.push_back("-aarch64-fix-cortex-a53-835769=1");
    }
  
    // Forward the -mglobal-merge option for explicit control over the pass.
    if (Arg *A = Args.getLastArg(options::OPT_mglobal_merge,
                                 options::OPT_mno_global_merge)) {
      CmdArgs.push_back("-mllvm");
      if (A->getOption().matches(options::OPT_mno_global_merge))
        CmdArgs.push_back("-aarch64-enable-global-merge=false");
      else
        CmdArgs.push_back("-aarch64-enable-global-merge=true");
    }
  
    // Enable/disable return address signing and indirect branch targets.
    if (Arg *A = Args.getLastArg(options::OPT_msign_return_address_EQ,
                                 options::OPT_mbranch_protection_EQ)) {
  
      const Driver &D = getToolChain().getDriver();
  
      StringRef Scope, Key;
      bool IndirectBranches;
  
      if (A->getOption().matches(options::OPT_msign_return_address_EQ)) {
        Scope = A->getValue();
        if (!Scope.equals("none") && !Scope.equals("non-leaf") &&
            !Scope.equals("all"))
          D.Diag(diag::err_invalid_branch_protection)
              << Scope << A->getAsString(Args);
        Key = "a_key";
        IndirectBranches = false;
      } else {
        StringRef Err;
        llvm::AArch64::ParsedBranchProtection PBP;
        if (!llvm::AArch64::parseBranchProtection(A->getValue(), PBP, Err))
          D.Diag(diag::err_invalid_branch_protection)
              << Err << A->getAsString(Args);
        Scope = PBP.Scope;
        Key = PBP.Key;
        IndirectBranches = PBP.BranchTargetEnforcement;
      }
  
      CmdArgs.push_back(
          Args.MakeArgString(Twine("-msign-return-address=") + Scope));
      CmdArgs.push_back(
          Args.MakeArgString(Twine("-msign-return-address-key=") + Key));
      if (IndirectBranches)
        CmdArgs.push_back("-mbranch-target-enforce");
    }
  
    // Handle -msve_vector_bits=<bits>
    if (Arg *A = Args.getLastArg(options::OPT_msve_vector_bits_EQ)) {
      StringRef Val = A->getValue();
      const Driver &D = getToolChain().getDriver();
      if (Val.equals("128") || Val.equals("256") || Val.equals("512") ||
          Val.equals("1024") || Val.equals("2048"))
        CmdArgs.push_back(
            Args.MakeArgString(llvm::Twine("-msve-vector-bits=") + Val));
      // Silently drop requests for vector-length agnostic code as it's implied.
      else if (!Val.equals("scalable"))
        // Handle the unsupported values passed to msve-vector-bits.
        D.Diag(diag::err_drv_unsupported_option_argument)
            << A->getOption().getName() << Val;
    }
  
    AddAAPCSVolatileBitfieldArgs(Args, CmdArgs);
  }
  
  void Clang::AddMIPSTargetArgs(const ArgList &Args,
                                ArgStringList &CmdArgs) const {
    const Driver &D = getToolChain().getDriver();
    StringRef CPUName;
    StringRef ABIName;
    const llvm::Triple &Triple = getToolChain().getTriple();
    mips::getMipsCPUAndABI(Args, Triple, CPUName, ABIName);
  
    CmdArgs.push_back("-target-abi");
    CmdArgs.push_back(ABIName.data());
  
    mips::FloatABI ABI = mips::getMipsFloatABI(D, Args, Triple);
    if (ABI == mips::FloatABI::Soft) {
      // Floating point operations and argument passing are soft.
      CmdArgs.push_back("-msoft-float");
      CmdArgs.push_back("-mfloat-abi");
      CmdArgs.push_back("soft");
    } else {
      // Floating point operations and argument passing are hard.
      assert(ABI == mips::FloatABI::Hard && "Invalid float abi!");
      CmdArgs.push_back("-mfloat-abi");
      CmdArgs.push_back("hard");
    }
  
    if (Arg *A = Args.getLastArg(options::OPT_mldc1_sdc1,
                                 options::OPT_mno_ldc1_sdc1)) {
      if (A->getOption().matches(options::OPT_mno_ldc1_sdc1)) {
        CmdArgs.push_back("-mllvm");
        CmdArgs.push_back("-mno-ldc1-sdc1");
      }
    }
  
    if (Arg *A = Args.getLastArg(options::OPT_mcheck_zero_division,
                                 options::OPT_mno_check_zero_division)) {
      if (A->getOption().matches(options::OPT_mno_check_zero_division)) {
        CmdArgs.push_back("-mllvm");
        CmdArgs.push_back("-mno-check-zero-division");
      }
    }
  
    if (Arg *A = Args.getLastArg(options::OPT_G)) {
      StringRef v = A->getValue();
      CmdArgs.push_back("-mllvm");
      CmdArgs.push_back(Args.MakeArgString("-mips-ssection-threshold=" + v));
      A->claim();
    }
  
    Arg *GPOpt = Args.getLastArg(options::OPT_mgpopt, options::OPT_mno_gpopt);
    Arg *ABICalls =
        Args.getLastArg(options::OPT_mabicalls, options::OPT_mno_abicalls);
  
    // -mabicalls is the default for many MIPS environments, even with -fno-pic.
    // -mgpopt is the default for static, -fno-pic environments but these two
    // options conflict. We want to be certain that -mno-abicalls -mgpopt is
    // the only case where -mllvm -mgpopt is passed.
    // NOTE: We need a warning here or in the backend to warn when -mgpopt is
    //       passed explicitly when compiling something with -mabicalls
    //       (implictly) in affect. Currently the warning is in the backend.
    //
    // When the ABI in use is  N64, we also need to determine the PIC mode that
    // is in use, as -fno-pic for N64 implies -mno-abicalls.
    bool NoABICalls =
        ABICalls && ABICalls->getOption().matches(options::OPT_mno_abicalls);
  
    llvm::Reloc::Model RelocationModel;
    unsigned PICLevel;
    bool IsPIE;
    std::tie(RelocationModel, PICLevel, IsPIE) =
        ParsePICArgs(getToolChain(), Args);
  
    NoABICalls = NoABICalls ||
                 (RelocationModel == llvm::Reloc::Static && ABIName == "n64");
  
    bool WantGPOpt = GPOpt && GPOpt->getOption().matches(options::OPT_mgpopt);
    // We quietly ignore -mno-gpopt as the backend defaults to -mno-gpopt.
    if (NoABICalls && (!GPOpt || WantGPOpt)) {
      CmdArgs.push_back("-mllvm");
      CmdArgs.push_back("-mgpopt");
  
      Arg *LocalSData = Args.getLastArg(options::OPT_mlocal_sdata,
                                        options::OPT_mno_local_sdata);
      Arg *ExternSData = Args.getLastArg(options::OPT_mextern_sdata,
                                         options::OPT_mno_extern_sdata);
      Arg *EmbeddedData = Args.getLastArg(options::OPT_membedded_data,
                                          options::OPT_mno_embedded_data);
      if (LocalSData) {
        CmdArgs.push_back("-mllvm");
        if (LocalSData->getOption().matches(options::OPT_mlocal_sdata)) {
          CmdArgs.push_back("-mlocal-sdata=1");
        } else {
          CmdArgs.push_back("-mlocal-sdata=0");
        }
        LocalSData->claim();
      }
  
      if (ExternSData) {
        CmdArgs.push_back("-mllvm");
        if (ExternSData->getOption().matches(options::OPT_mextern_sdata)) {
          CmdArgs.push_back("-mextern-sdata=1");
        } else {
          CmdArgs.push_back("-mextern-sdata=0");
        }
        ExternSData->claim();
      }
  
      if (EmbeddedData) {
        CmdArgs.push_back("-mllvm");
        if (EmbeddedData->getOption().matches(options::OPT_membedded_data)) {
          CmdArgs.push_back("-membedded-data=1");
        } else {
          CmdArgs.push_back("-membedded-data=0");
        }
        EmbeddedData->claim();
      }
  
    } else if ((!ABICalls || (!NoABICalls && ABICalls)) && WantGPOpt)
      D.Diag(diag::warn_drv_unsupported_gpopt) << (ABICalls ? 0 : 1);
  
    if (GPOpt)
      GPOpt->claim();
  
    if (Arg *A = Args.getLastArg(options::OPT_mcompact_branches_EQ)) {
      StringRef Val = StringRef(A->getValue());
      if (mips::hasCompactBranches(CPUName)) {
        if (Val == "never" || Val == "always" || Val == "optimal") {
          CmdArgs.push_back("-mllvm");
          CmdArgs.push_back(Args.MakeArgString("-mips-compact-branches=" + Val));
        } else
          D.Diag(diag::err_drv_unsupported_option_argument)
              << A->getOption().getName() << Val;
      } else
        D.Diag(diag::warn_target_unsupported_compact_branches) << CPUName;
    }
  
    if (Arg *A = Args.getLastArg(options::OPT_mrelax_pic_calls,
                                 options::OPT_mno_relax_pic_calls)) {
      if (A->getOption().matches(options::OPT_mno_relax_pic_calls)) {
        CmdArgs.push_back("-mllvm");
        CmdArgs.push_back("-mips-jalr-reloc=0");
      }
    }
  }
  
  void Clang::AddPPCTargetArgs(const ArgList &Args,
                               ArgStringList &CmdArgs) const {
    // Select the ABI to use.
    const char *ABIName = nullptr;
    const llvm::Triple &T = getToolChain().getTriple();
    if (T.isOSBinFormatELF()) {
      switch (getToolChain().getArch()) {
      case llvm::Triple::ppc64: {
        if ((T.isOSFreeBSD() && T.getOSMajorVersion() >= 13) ||
            T.isOSOpenBSD() || T.isMusl())
          ABIName = "elfv2";
        else
          ABIName = "elfv1";
        break;
      }
      case llvm::Triple::ppc64le:
        ABIName = "elfv2";
        break;
      default:
        break;
      }
    }
  
    bool IEEELongDouble = false;
    for (const Arg *A : Args.filtered(options::OPT_mabi_EQ)) {
      StringRef V = A->getValue();
      if (V == "ieeelongdouble")
        IEEELongDouble = true;
      else if (V == "ibmlongdouble")
        IEEELongDouble = false;
      else if (V != "altivec")
        // The ppc64 linux abis are all "altivec" abis by default. Accept and ignore
        // the option if given as we don't have backend support for any targets
        // that don't use the altivec abi.
        ABIName = A->getValue();
    }
    if (IEEELongDouble)
      CmdArgs.push_back("-mabi=ieeelongdouble");
  
    ppc::FloatABI FloatABI =
        ppc::getPPCFloatABI(getToolChain().getDriver(), Args);
  
    if (FloatABI == ppc::FloatABI::Soft) {
      // Floating point operations and argument passing are soft.
      CmdArgs.push_back("-msoft-float");
      CmdArgs.push_back("-mfloat-abi");
      CmdArgs.push_back("soft");
    } else {
      // Floating point operations and argument passing are hard.
      assert(FloatABI == ppc::FloatABI::Hard && "Invalid float abi!");
      CmdArgs.push_back("-mfloat-abi");
      CmdArgs.push_back("hard");
    }
  
    if (ABIName) {
      CmdArgs.push_back("-target-abi");
      CmdArgs.push_back(ABIName);
    }
  }
  
  static void SetRISCVSmallDataLimit(const ToolChain &TC, const ArgList &Args,
                                     ArgStringList &CmdArgs) {
    const Driver &D = TC.getDriver();
    const llvm::Triple &Triple = TC.getTriple();
    // Default small data limitation is eight.
    const char *SmallDataLimit = "8";
    // Get small data limitation.
    if (Args.getLastArg(options::OPT_shared, options::OPT_fpic,
                        options::OPT_fPIC)) {
      // Not support linker relaxation for PIC.
      SmallDataLimit = "0";
      if (Args.hasArg(options::OPT_G)) {
        D.Diag(diag::warn_drv_unsupported_sdata);
      }
    } else if (Args.getLastArgValue(options::OPT_mcmodel_EQ)
                   .equals_insensitive("large") &&
               (Triple.getArch() == llvm::Triple::riscv64)) {
      // Not support linker relaxation for RV64 with large code model.
      SmallDataLimit = "0";
      if (Args.hasArg(options::OPT_G)) {
        D.Diag(diag::warn_drv_unsupported_sdata);
      }
    } else if (Arg *A = Args.getLastArg(options::OPT_G)) {
      SmallDataLimit = A->getValue();
    }
    // Forward the -msmall-data-limit= option.
    CmdArgs.push_back("-msmall-data-limit");
    CmdArgs.push_back(SmallDataLimit);
  }
  
  void Clang::AddRISCVTargetArgs(const ArgList &Args,
                                 ArgStringList &CmdArgs) const {
    const llvm::Triple &Triple = getToolChain().getTriple();
    StringRef ABIName = riscv::getRISCVABI(Args, Triple);
  
    CmdArgs.push_back("-target-abi");
    CmdArgs.push_back(ABIName.data());
  
    SetRISCVSmallDataLimit(getToolChain(), Args, CmdArgs);
  
    std::string TuneCPU;
  
    if (const Arg *A = Args.getLastArg(clang::driver::options::OPT_mtune_EQ)) {
      StringRef Name = A->getValue();
  
      Name = llvm::RISCV::resolveTuneCPUAlias(Name, Triple.isArch64Bit());
      TuneCPU = std::string(Name);
    }
  
    if (!TuneCPU.empty()) {
      CmdArgs.push_back("-tune-cpu");
      CmdArgs.push_back(Args.MakeArgString(TuneCPU));
    }
  }
  
  void Clang::AddSparcTargetArgs(const ArgList &Args,
                                 ArgStringList &CmdArgs) const {
    sparc::FloatABI FloatABI =
        sparc::getSparcFloatABI(getToolChain().getDriver(), Args);
  
    if (FloatABI == sparc::FloatABI::Soft) {
      // Floating point operations and argument passing are soft.
      CmdArgs.push_back("-msoft-float");
      CmdArgs.push_back("-mfloat-abi");
      CmdArgs.push_back("soft");
    } else {
      // Floating point operations and argument passing are hard.
      assert(FloatABI == sparc::FloatABI::Hard && "Invalid float abi!");
      CmdArgs.push_back("-mfloat-abi");
      CmdArgs.push_back("hard");
    }
  }
  
  void Clang::AddSystemZTargetArgs(const ArgList &Args,
                                   ArgStringList &CmdArgs) const {
    bool HasBackchain = Args.hasFlag(options::OPT_mbackchain,
                                     options::OPT_mno_backchain, false);
    bool HasPackedStack = Args.hasFlag(options::OPT_mpacked_stack,
                                       options::OPT_mno_packed_stack, false);
    systemz::FloatABI FloatABI =
        systemz::getSystemZFloatABI(getToolChain().getDriver(), Args);
    bool HasSoftFloat = (FloatABI == systemz::FloatABI::Soft);
    if (HasBackchain && HasPackedStack && !HasSoftFloat) {
      const Driver &D = getToolChain().getDriver();
      D.Diag(diag::err_drv_unsupported_opt)
        << "-mpacked-stack -mbackchain -mhard-float";
    }
    if (HasBackchain)
      CmdArgs.push_back("-mbackchain");
    if (HasPackedStack)
      CmdArgs.push_back("-mpacked-stack");
    if (HasSoftFloat) {
      // Floating point operations and argument passing are soft.
      CmdArgs.push_back("-msoft-float");
      CmdArgs.push_back("-mfloat-abi");
      CmdArgs.push_back("soft");
    }
  }
  
  void Clang::AddX86TargetArgs(const ArgList &Args,
                               ArgStringList &CmdArgs) const {
    const Driver &D = getToolChain().getDriver();
    addX86AlignBranchArgs(D, Args, CmdArgs, /*IsLTO=*/false);
  
    if (!Args.hasFlag(options::OPT_mred_zone, options::OPT_mno_red_zone, true) ||
        Args.hasArg(options::OPT_mkernel) ||
        Args.hasArg(options::OPT_fapple_kext))
      CmdArgs.push_back("-disable-red-zone");
  
    if (!Args.hasFlag(options::OPT_mtls_direct_seg_refs,
                      options::OPT_mno_tls_direct_seg_refs, true))
      CmdArgs.push_back("-mno-tls-direct-seg-refs");
  
    // Default to avoid implicit floating-point for kernel/kext code, but allow
    // that to be overridden with -mno-soft-float.
    bool NoImplicitFloat = (Args.hasArg(options::OPT_mkernel) ||
                            Args.hasArg(options::OPT_fapple_kext));
    if (Arg *A = Args.getLastArg(
            options::OPT_msoft_float, options::OPT_mno_soft_float,
            options::OPT_mimplicit_float, options::OPT_mno_implicit_float)) {
      const Option &O = A->getOption();
      NoImplicitFloat = (O.matches(options::OPT_mno_implicit_float) ||
                         O.matches(options::OPT_msoft_float));
    }
    if (NoImplicitFloat)
      CmdArgs.push_back("-no-implicit-float");
  
    if (Arg *A = Args.getLastArg(options::OPT_masm_EQ)) {
      StringRef Value = A->getValue();
      if (Value == "intel" || Value == "att") {
        CmdArgs.push_back("-mllvm");
        CmdArgs.push_back(Args.MakeArgString("-x86-asm-syntax=" + Value));
      } else {
        D.Diag(diag::err_drv_unsupported_option_argument)
            << A->getOption().getName() << Value;
      }
    } else if (D.IsCLMode()) {
      CmdArgs.push_back("-mllvm");
      CmdArgs.push_back("-x86-asm-syntax=intel");
    }
  
    // Set flags to support MCU ABI.
    if (Args.hasFlag(options::OPT_miamcu, options::OPT_mno_iamcu, false)) {
      CmdArgs.push_back("-mfloat-abi");
      CmdArgs.push_back("soft");
      CmdArgs.push_back("-mstack-alignment=4");
    }
  
    // Handle -mtune.
  
    // Default to "generic" unless -march is present or targetting the PS4.
    std::string TuneCPU;
    if (!Args.hasArg(clang::driver::options::OPT_march_EQ) &&
        !getToolChain().getTriple().isPS4CPU())
      TuneCPU = "generic";
  
    // Override based on -mtune.
    if (const Arg *A = Args.getLastArg(clang::driver::options::OPT_mtune_EQ)) {
      StringRef Name = A->getValue();
  
      if (Name == "native") {
        Name = llvm::sys::getHostCPUName();
        if (!Name.empty())
          TuneCPU = std::string(Name);
      } else
        TuneCPU = std::string(Name);
    }
  
    if (!TuneCPU.empty()) {
      CmdArgs.push_back("-tune-cpu");
      CmdArgs.push_back(Args.MakeArgString(TuneCPU));
    }
  }
  
  void Clang::AddHexagonTargetArgs(const ArgList &Args,
                                   ArgStringList &CmdArgs) const {
    CmdArgs.push_back("-mqdsp6-compat");
    CmdArgs.push_back("-Wreturn-type");
  
    if (auto G = toolchains::HexagonToolChain::getSmallDataThreshold(Args)) {
      CmdArgs.push_back("-mllvm");
      CmdArgs.push_back(Args.MakeArgString("-hexagon-small-data-threshold=" +
                                           Twine(G.getValue())));
    }
  
    if (!Args.hasArg(options::OPT_fno_short_enums))
      CmdArgs.push_back("-fshort-enums");
    if (Args.getLastArg(options::OPT_mieee_rnd_near)) {
      CmdArgs.push_back("-mllvm");
      CmdArgs.push_back("-enable-hexagon-ieee-rnd-near");
    }
    CmdArgs.push_back("-mllvm");
    CmdArgs.push_back("-machine-sink-split=0");
  }
  
  void Clang::AddLanaiTargetArgs(const ArgList &Args,
                                 ArgStringList &CmdArgs) const {
    if (Arg *A = Args.getLastArg(options::OPT_mcpu_EQ)) {
      StringRef CPUName = A->getValue();
  
      CmdArgs.push_back("-target-cpu");
      CmdArgs.push_back(Args.MakeArgString(CPUName));
    }
    if (Arg *A = Args.getLastArg(options::OPT_mregparm_EQ)) {
      StringRef Value = A->getValue();
      // Only support mregparm=4 to support old usage. Report error for all other
      // cases.
      int Mregparm;
      if (Value.getAsInteger(10, Mregparm)) {
        if (Mregparm != 4) {
          getToolChain().getDriver().Diag(
              diag::err_drv_unsupported_option_argument)
              << A->getOption().getName() << Value;
        }
      }
    }
  }
  
  void Clang::AddWebAssemblyTargetArgs(const ArgList &Args,
                                       ArgStringList &CmdArgs) const {
    // Default to "hidden" visibility.
    if (!Args.hasArg(options::OPT_fvisibility_EQ,
                     options::OPT_fvisibility_ms_compat)) {
      CmdArgs.push_back("-fvisibility");
      CmdArgs.push_back("hidden");
    }
  }
  
  void Clang::AddVETargetArgs(const ArgList &Args, ArgStringList &CmdArgs) const {
    // Floating point operations and argument passing are hard.
    CmdArgs.push_back("-mfloat-abi");
    CmdArgs.push_back("hard");
  }
  
  void Clang::DumpCompilationDatabase(Compilation &C, StringRef Filename,
                                      StringRef Target, const InputInfo &Output,
                                      const InputInfo &Input, const ArgList &Args) const {
    // If this is a dry run, do not create the compilation database file.
    if (C.getArgs().hasArg(options::OPT__HASH_HASH_HASH))
      return;
  
    using llvm::yaml::escape;
    const Driver &D = getToolChain().getDriver();
  
    if (!CompilationDatabase) {
      std::error_code EC;
      auto File = std::make_unique<llvm::raw_fd_ostream>(
          Filename, EC, llvm::sys::fs::OF_TextWithCRLF);
      if (EC) {
        D.Diag(clang::diag::err_drv_compilationdatabase) << Filename
                                                         << EC.message();
        return;
      }
      CompilationDatabase = std::move(File);
    }
    auto &CDB = *CompilationDatabase;
    auto CWD = D.getVFS().getCurrentWorkingDirectory();
    if (!CWD)
      CWD = ".";
    CDB << "{ \"directory\": \"" << escape(*CWD) << "\"";
    CDB << ", \"file\": \"" << escape(Input.getFilename()) << "\"";
    CDB << ", \"output\": \"" << escape(Output.getFilename()) << "\"";
    CDB << ", \"arguments\": [\"" << escape(D.ClangExecutable) << "\"";
    SmallString<128> Buf;
    Buf = "-x";
    Buf += types::getTypeName(Input.getType());
    CDB << ", \"" << escape(Buf) << "\"";
    if (!D.SysRoot.empty() && !Args.hasArg(options::OPT__sysroot_EQ)) {
      Buf = "--sysroot=";
      Buf += D.SysRoot;
      CDB << ", \"" << escape(Buf) << "\"";
    }
    CDB << ", \"" << escape(Input.getFilename()) << "\"";
    for (auto &A: Args) {
      auto &O = A->getOption();
      // Skip language selection, which is positional.
      if (O.getID() == options::OPT_x)
        continue;
      // Skip writing dependency output and the compilation database itself.
      if (O.getGroup().isValid() && O.getGroup().getID() == options::OPT_M_Group)
        continue;
      if (O.getID() == options::OPT_gen_cdb_fragment_path)
        continue;
      // Skip inputs.
      if (O.getKind() == Option::InputClass)
        continue;
      // All other arguments are quoted and appended.
      ArgStringList ASL;
      A->render(Args, ASL);
      for (auto &it: ASL)
        CDB << ", \"" << escape(it) << "\"";
    }
    Buf = "--target=";
    Buf += Target;
    CDB << ", \"" << escape(Buf) << "\"]},\n";
  }
  
  void Clang::DumpCompilationDatabaseFragmentToDir(
      StringRef Dir, Compilation &C, StringRef Target, const InputInfo &Output,
      const InputInfo &Input, const llvm::opt::ArgList &Args) const {
    // If this is a dry run, do not create the compilation database file.
    if (C.getArgs().hasArg(options::OPT__HASH_HASH_HASH))
      return;
  
    if (CompilationDatabase)
      DumpCompilationDatabase(C, "", Target, Output, Input, Args);
  
    SmallString<256> Path = Dir;
    const auto &Driver = C.getDriver();
    Driver.getVFS().makeAbsolute(Path);
    auto Err = llvm::sys::fs::create_directory(Path, /*IgnoreExisting=*/true);
    if (Err) {
      Driver.Diag(diag::err_drv_compilationdatabase) << Dir << Err.message();
      return;
    }
  
    llvm::sys::path::append(
        Path,
        Twine(llvm::sys::path::filename(Input.getFilename())) + ".%%%%.json");
    int FD;
    SmallString<256> TempPath;
    Err = llvm::sys::fs::createUniqueFile(Path, FD, TempPath,
                                          llvm::sys::fs::OF_Text);
    if (Err) {
      Driver.Diag(diag::err_drv_compilationdatabase) << Path << Err.message();
      return;
    }
    CompilationDatabase =
        std::make_unique<llvm::raw_fd_ostream>(FD, /*shouldClose=*/true);
    DumpCompilationDatabase(C, "", Target, Output, Input, Args);
  }
  
  static bool CheckARMImplicitITArg(StringRef Value) {
    return Value == "always" || Value == "never" || Value == "arm" ||
           Value == "thumb";
  }
  
  static void AddARMImplicitITArgs(const ArgList &Args, ArgStringList &CmdArgs,
                                   StringRef Value) {
    CmdArgs.push_back("-mllvm");
    CmdArgs.push_back(Args.MakeArgString("-arm-implicit-it=" + Value));
  }
  
  static void CollectArgsForIntegratedAssembler(Compilation &C,
                                                const ArgList &Args,
                                                ArgStringList &CmdArgs,
                                                const Driver &D) {
    if (UseRelaxAll(C, Args))
      CmdArgs.push_back("-mrelax-all");
  
    // Only default to -mincremental-linker-compatible if we think we are
    // targeting the MSVC linker.
    bool DefaultIncrementalLinkerCompatible =
        C.getDefaultToolChain().getTriple().isWindowsMSVCEnvironment();
    if (Args.hasFlag(options::OPT_mincremental_linker_compatible,
                     options::OPT_mno_incremental_linker_compatible,
                     DefaultIncrementalLinkerCompatible))
      CmdArgs.push_back("-mincremental-linker-compatible");
  
    // If you add more args here, also add them to the block below that
    // starts with "// If CollectArgsForIntegratedAssembler() isn't called below".
  
    // When passing -I arguments to the assembler we sometimes need to
    // unconditionally take the next argument.  For example, when parsing
    // '-Wa,-I -Wa,foo' we need to accept the -Wa,foo arg after seeing the
    // -Wa,-I arg and when parsing '-Wa,-I,foo' we need to accept the 'foo'
    // arg after parsing the '-I' arg.
    bool TakeNextArg = false;
  
    bool UseRelaxRelocations = C.getDefaultToolChain().useRelaxRelocations();
    bool UseNoExecStack = C.getDefaultToolChain().isNoExecStackDefault();
    const char *MipsTargetFeature = nullptr;
    StringRef ImplicitIt;
    for (const Arg *A :
         Args.filtered(options::OPT_Wa_COMMA, options::OPT_Xassembler,
                       options::OPT_mimplicit_it_EQ)) {
      A->claim();
  
      if (A->getOption().getID() == options::OPT_mimplicit_it_EQ) {
        switch (C.getDefaultToolChain().getArch()) {
        case llvm::Triple::arm:
        case llvm::Triple::armeb:
        case llvm::Triple::thumb:
        case llvm::Triple::thumbeb:
          // Only store the value; the last value set takes effect.
          ImplicitIt = A->getValue();
          if (!CheckARMImplicitITArg(ImplicitIt))
            D.Diag(diag::err_drv_unsupported_option_argument)
                << A->getOption().getName() << ImplicitIt;
          continue;
        default:
          break;
        }
      }
  
      for (StringRef Value : A->getValues()) {
        if (TakeNextArg) {
          CmdArgs.push_back(Value.data());
          TakeNextArg = false;
          continue;
        }
  
        if (C.getDefaultToolChain().getTriple().isOSBinFormatCOFF() &&
            Value == "-mbig-obj")
          continue; // LLVM handles bigobj automatically
  
        switch (C.getDefaultToolChain().getArch()) {
        default:
          break;
        case llvm::Triple::thumb:
        case llvm::Triple::thumbeb:
        case llvm::Triple::arm:
        case llvm::Triple::armeb:
          if (Value.startswith("-mimplicit-it=")) {
            // Only store the value; the last value set takes effect.
            ImplicitIt = Value.split("=").second;
            if (CheckARMImplicitITArg(ImplicitIt))
              continue;
          }
          if (Value == "-mthumb")
            // -mthumb has already been processed in ComputeLLVMTriple()
            // recognize but skip over here.
            continue;
          break;
        case llvm::Triple::mips:
        case llvm::Triple::mipsel:
        case llvm::Triple::mips64:
        case llvm::Triple::mips64el:
          if (Value == "--trap") {
            CmdArgs.push_back("-target-feature");
            CmdArgs.push_back("+use-tcc-in-div");
            continue;
          }
          if (Value == "--break") {
            CmdArgs.push_back("-target-feature");
            CmdArgs.push_back("-use-tcc-in-div");
            continue;
          }
          if (Value.startswith("-msoft-float")) {
            CmdArgs.push_back("-target-feature");
            CmdArgs.push_back("+soft-float");
            continue;
          }
          if (Value.startswith("-mhard-float")) {
            CmdArgs.push_back("-target-feature");
            CmdArgs.push_back("-soft-float");
            continue;
          }
  
          MipsTargetFeature = llvm::StringSwitch<const char *>(Value)
                                  .Case("-mips1", "+mips1")
                                  .Case("-mips2", "+mips2")
                                  .Case("-mips3", "+mips3")
                                  .Case("-mips4", "+mips4")
                                  .Case("-mips5", "+mips5")
                                  .Case("-mips32", "+mips32")
                                  .Case("-mips32r2", "+mips32r2")
                                  .Case("-mips32r3", "+mips32r3")
                                  .Case("-mips32r5", "+mips32r5")
                                  .Case("-mips32r6", "+mips32r6")
                                  .Case("-mips64", "+mips64")
                                  .Case("-mips64r2", "+mips64r2")
                                  .Case("-mips64r3", "+mips64r3")
                                  .Case("-mips64r5", "+mips64r5")
                                  .Case("-mips64r6", "+mips64r6")
                                  .Default(nullptr);
          if (MipsTargetFeature)
            continue;
        }
  
        if (Value == "-force_cpusubtype_ALL") {
          // Do nothing, this is the default and we don't support anything else.
        } else if (Value == "-L") {
          CmdArgs.push_back("-msave-temp-labels");
        } else if (Value == "--fatal-warnings") {
          CmdArgs.push_back("-massembler-fatal-warnings");
        } else if (Value == "--no-warn" || Value == "-W") {
          CmdArgs.push_back("-massembler-no-warn");
        } else if (Value == "--noexecstack") {
          UseNoExecStack = true;
        } else if (Value.startswith("-compress-debug-sections") ||
                   Value.startswith("--compress-debug-sections") ||
                   Value == "-nocompress-debug-sections" ||
                   Value == "--nocompress-debug-sections") {
          CmdArgs.push_back(Value.data());
        } else if (Value == "-mrelax-relocations=yes" ||
                   Value == "--mrelax-relocations=yes") {
          UseRelaxRelocations = true;
        } else if (Value == "-mrelax-relocations=no" ||
                   Value == "--mrelax-relocations=no") {
          UseRelaxRelocations = false;
        } else if (Value.startswith("-I")) {
          CmdArgs.push_back(Value.data());
          // We need to consume the next argument if the current arg is a plain
          // -I. The next arg will be the include directory.
          if (Value == "-I")
            TakeNextArg = true;
        } else if (Value.startswith("-gdwarf-")) {
          // "-gdwarf-N" options are not cc1as options.
          unsigned DwarfVersion = DwarfVersionNum(Value);
          if (DwarfVersion == 0) { // Send it onward, and let cc1as complain.
            CmdArgs.push_back(Value.data());
          } else {
            RenderDebugEnablingArgs(Args, CmdArgs,
                                    codegenoptions::LimitedDebugInfo,
                                    DwarfVersion, llvm::DebuggerKind::Default);
          }
        } else if (Value.startswith("-mcpu") || Value.startswith("-mfpu") ||
                   Value.startswith("-mhwdiv") || Value.startswith("-march")) {
          // Do nothing, we'll validate it later.
        } else if (Value == "-defsym") {
            if (A->getNumValues() != 2) {
              D.Diag(diag::err_drv_defsym_invalid_format) << Value;
              break;
            }
            const char *S = A->getValue(1);
            auto Pair = StringRef(S).split('=');
            auto Sym = Pair.first;
            auto SVal = Pair.second;
  
            if (Sym.empty() || SVal.empty()) {
              D.Diag(diag::err_drv_defsym_invalid_format) << S;
              break;
            }
            int64_t IVal;
            if (SVal.getAsInteger(0, IVal)) {
              D.Diag(diag::err_drv_defsym_invalid_symval) << SVal;
              break;
            }
            CmdArgs.push_back(Value.data());
            TakeNextArg = true;
        } else if (Value == "-fdebug-compilation-dir") {
          CmdArgs.push_back("-fdebug-compilation-dir");
          TakeNextArg = true;
        } else if (Value.consume_front("-fdebug-compilation-dir=")) {
          // The flag is a -Wa / -Xassembler argument and Options doesn't
          // parse the argument, so this isn't automatically aliased to
          // -fdebug-compilation-dir (without '=') here.
          CmdArgs.push_back("-fdebug-compilation-dir");
          CmdArgs.push_back(Value.data());
        } else if (Value == "--version") {
          D.PrintVersion(C, llvm::outs());
        } else {
          D.Diag(diag::err_drv_unsupported_option_argument)
              << A->getOption().getName() << Value;
        }
      }
    }
    if (ImplicitIt.size())
      AddARMImplicitITArgs(Args, CmdArgs, ImplicitIt);
    if (UseRelaxRelocations)
      CmdArgs.push_back("--mrelax-relocations");
    if (UseNoExecStack)
      CmdArgs.push_back("-mnoexecstack");
    if (MipsTargetFeature != nullptr) {
      CmdArgs.push_back("-target-feature");
      CmdArgs.push_back(MipsTargetFeature);
    }
  
    // forward -fembed-bitcode to assmebler
    if (C.getDriver().embedBitcodeEnabled() ||
        C.getDriver().embedBitcodeMarkerOnly())
      Args.AddLastArg(CmdArgs, options::OPT_fembed_bitcode_EQ);
  }
  
  static void RenderFloatingPointOptions(const ToolChain &TC, const Driver &D,
                                         bool OFastEnabled, const ArgList &Args,
                                         ArgStringList &CmdArgs,
                                         const JobAction &JA) {
    // Handle various floating point optimization flags, mapping them to the
    // appropriate LLVM code generation flags. This is complicated by several
    // "umbrella" flags, so we do this by stepping through the flags incrementally
    // adjusting what we think is enabled/disabled, then at the end setting the
    // LLVM flags based on the final state.
    bool HonorINFs = true;
    bool HonorNaNs = true;
    // -fmath-errno is the default on some platforms, e.g. BSD-derived OSes.
    bool MathErrno = TC.IsMathErrnoDefault();
    bool AssociativeMath = false;
    bool ReciprocalMath = false;
    bool SignedZeros = true;
    bool TrappingMath = false; // Implemented via -ffp-exception-behavior
    bool TrappingMathPresent = false; // Is trapping-math in args, and not
                                      // overriden by ffp-exception-behavior?
    bool RoundingFPMath = false;
    bool RoundingMathPresent = false; // Is rounding-math in args?
    // -ffp-model values: strict, fast, precise
    StringRef FPModel = "";
    // -ffp-exception-behavior options: strict, maytrap, ignore
    StringRef FPExceptionBehavior = "";
    const llvm::DenormalMode DefaultDenormalFPMath =
        TC.getDefaultDenormalModeForType(Args, JA);
    const llvm::DenormalMode DefaultDenormalFP32Math =
        TC.getDefaultDenormalModeForType(Args, JA, &llvm::APFloat::IEEEsingle());
  
    llvm::DenormalMode DenormalFPMath = DefaultDenormalFPMath;
    llvm::DenormalMode DenormalFP32Math = DefaultDenormalFP32Math;
    StringRef FPContract = "";
    bool StrictFPModel = false;
  
  
    if (const Arg *A = Args.getLastArg(options::OPT_flimited_precision_EQ)) {
      CmdArgs.push_back("-mlimit-float-precision");
      CmdArgs.push_back(A->getValue());
    }
  
    for (const Arg *A : Args) {
      auto optID = A->getOption().getID();
      bool PreciseFPModel = false;
      switch (optID) {
      default:
        break;
      case options::OPT_ffp_model_EQ: {
        // If -ffp-model= is seen, reset to fno-fast-math
        HonorINFs = true;
        HonorNaNs = true;
        // Turning *off* -ffast-math restores the toolchain default.
        MathErrno = TC.IsMathErrnoDefault();
        AssociativeMath = false;
        ReciprocalMath = false;
        SignedZeros = true;
        // -fno_fast_math restores default denormal and fpcontract handling
        FPContract = "";
        DenormalFPMath = llvm::DenormalMode::getIEEE();
  
        // FIXME: The target may have picked a non-IEEE default mode here based on
        // -cl-denorms-are-zero. Should the target consider -fp-model interaction?
        DenormalFP32Math = llvm::DenormalMode::getIEEE();
  
        StringRef Val = A->getValue();
        if (OFastEnabled && !Val.equals("fast")) {
            // Only -ffp-model=fast is compatible with OFast, ignore.
          D.Diag(clang::diag::warn_drv_overriding_flag_option)
            << Args.MakeArgString("-ffp-model=" + Val)
            << "-Ofast";
          break;
        }
        StrictFPModel = false;
        PreciseFPModel = true;
        // ffp-model= is a Driver option, it is entirely rewritten into more
        // granular options before being passed into cc1.
        // Use the gcc option in the switch below.
        if (!FPModel.empty() && !FPModel.equals(Val)) {
          D.Diag(clang::diag::warn_drv_overriding_flag_option)
            << Args.MakeArgString("-ffp-model=" + FPModel)
            << Args.MakeArgString("-ffp-model=" + Val);
          FPContract = "";
        }
        if (Val.equals("fast")) {
          optID = options::OPT_ffast_math;
          FPModel = Val;
          FPContract = "fast";
        } else if (Val.equals("precise")) {
          optID = options::OPT_ffp_contract;
          FPModel = Val;
          FPContract = "fast";
          PreciseFPModel = true;
        } else if (Val.equals("strict")) {
          StrictFPModel = true;
          optID = options::OPT_frounding_math;
          FPExceptionBehavior = "strict";
          FPModel = Val;
          FPContract = "off";
          TrappingMath = true;
        } else
          D.Diag(diag::err_drv_unsupported_option_argument)
              << A->getOption().getName() << Val;
        break;
        }
      }
  
      switch (optID) {
      // If this isn't an FP option skip the claim below
      default: continue;
  
      // Options controlling individual features
      case options::OPT_fhonor_infinities:    HonorINFs = true;         break;
      case options::OPT_fno_honor_infinities: HonorINFs = false;        break;
      case options::OPT_fhonor_nans:          HonorNaNs = true;         break;
      case options::OPT_fno_honor_nans:       HonorNaNs = false;        break;
      case options::OPT_fmath_errno:          MathErrno = true;         break;
      case options::OPT_fno_math_errno:       MathErrno = false;        break;
      case options::OPT_fassociative_math:    AssociativeMath = true;   break;
      case options::OPT_fno_associative_math: AssociativeMath = false;  break;
      case options::OPT_freciprocal_math:     ReciprocalMath = true;    break;
      case options::OPT_fno_reciprocal_math:  ReciprocalMath = false;   break;
      case options::OPT_fsigned_zeros:        SignedZeros = true;       break;
      case options::OPT_fno_signed_zeros:     SignedZeros = false;      break;
      case options::OPT_ftrapping_math:
        if (!TrappingMathPresent && !FPExceptionBehavior.empty() &&
            !FPExceptionBehavior.equals("strict"))
          // Warn that previous value of option is overridden.
          D.Diag(clang::diag::warn_drv_overriding_flag_option)
            << Args.MakeArgString("-ffp-exception-behavior=" + FPExceptionBehavior)
            << "-ftrapping-math";
        TrappingMath = true;
        TrappingMathPresent = true;
        FPExceptionBehavior = "strict";
        break;
      case options::OPT_fno_trapping_math:
        if (!TrappingMathPresent && !FPExceptionBehavior.empty() &&
            !FPExceptionBehavior.equals("ignore"))
          // Warn that previous value of option is overridden.
          D.Diag(clang::diag::warn_drv_overriding_flag_option)
            << Args.MakeArgString("-ffp-exception-behavior=" + FPExceptionBehavior)
            << "-fno-trapping-math";
        TrappingMath = false;
        TrappingMathPresent = true;
        FPExceptionBehavior = "ignore";
        break;
  
      case options::OPT_frounding_math:
        RoundingFPMath = true;
        RoundingMathPresent = true;
        break;
  
      case options::OPT_fno_rounding_math:
        RoundingFPMath = false;
        RoundingMathPresent = false;
        break;
  
      case options::OPT_fdenormal_fp_math_EQ:
        DenormalFPMath = llvm::parseDenormalFPAttribute(A->getValue());
        if (!DenormalFPMath.isValid()) {
          D.Diag(diag::err_drv_invalid_value)
              << A->getAsString(Args) << A->getValue();
        }
        break;
  
      case options::OPT_fdenormal_fp_math_f32_EQ:
        DenormalFP32Math = llvm::parseDenormalFPAttribute(A->getValue());
        if (!DenormalFP32Math.isValid()) {
          D.Diag(diag::err_drv_invalid_value)
              << A->getAsString(Args) << A->getValue();
        }
        break;
  
      // Validate and pass through -ffp-contract option.
      case options::OPT_ffp_contract: {
        StringRef Val = A->getValue();
        if (PreciseFPModel) {
          // -ffp-model=precise enables ffp-contract=fast as a side effect
          // the FPContract value has already been set to a string literal
          // and the Val string isn't a pertinent value.
          ;
        } else if (Val.equals("fast") || Val.equals("on") || Val.equals("off"))
          FPContract = Val;
        else
          D.Diag(diag::err_drv_unsupported_option_argument)
             << A->getOption().getName() << Val;
        break;
      }
  
      // Validate and pass through -ffp-model option.
      case options::OPT_ffp_model_EQ:
        // This should only occur in the error case
        // since the optID has been replaced by a more granular
        // floating point option.
        break;
  
      // Validate and pass through -ffp-exception-behavior option.
      case options::OPT_ffp_exception_behavior_EQ: {
        StringRef Val = A->getValue();
        if (!TrappingMathPresent && !FPExceptionBehavior.empty() &&
            !FPExceptionBehavior.equals(Val))
          // Warn that previous value of option is overridden.
          D.Diag(clang::diag::warn_drv_overriding_flag_option)
            << Args.MakeArgString("-ffp-exception-behavior=" + FPExceptionBehavior)
            << Args.MakeArgString("-ffp-exception-behavior=" + Val);
        TrappingMath = TrappingMathPresent = false;
        if (Val.equals("ignore") || Val.equals("maytrap"))
          FPExceptionBehavior = Val;
        else if (Val.equals("strict")) {
          FPExceptionBehavior = Val;
          TrappingMath = TrappingMathPresent = true;
        } else
          D.Diag(diag::err_drv_unsupported_option_argument)
              << A->getOption().getName() << Val;
        break;
      }
  
      case options::OPT_ffinite_math_only:
        HonorINFs = false;
        HonorNaNs = false;
        break;
      case options::OPT_fno_finite_math_only:
        HonorINFs = true;
        HonorNaNs = true;
        break;
  
      case options::OPT_funsafe_math_optimizations:
        AssociativeMath = true;
        ReciprocalMath = true;
        SignedZeros = false;
        TrappingMath = false;
        FPExceptionBehavior = "";
        break;
      case options::OPT_fno_unsafe_math_optimizations:
        AssociativeMath = false;
        ReciprocalMath = false;
        SignedZeros = true;
        TrappingMath = true;
        FPExceptionBehavior = "strict";
  
        // The target may have opted to flush by default, so force IEEE.
        DenormalFPMath = llvm::DenormalMode::getIEEE();
        DenormalFP32Math = llvm::DenormalMode::getIEEE();
        break;
  
      case options::OPT_Ofast:
        // If -Ofast is the optimization level, then -ffast-math should be enabled
        if (!OFastEnabled)
          continue;
        LLVM_FALLTHROUGH;
      case options::OPT_ffast_math:
        HonorINFs = false;
        HonorNaNs = false;
        MathErrno = false;
        AssociativeMath = true;
        ReciprocalMath = true;
        SignedZeros = false;
        TrappingMath = false;
        RoundingFPMath = false;
        // If fast-math is set then set the fp-contract mode to fast.
        FPContract = "fast";
        break;
      case options::OPT_fno_fast_math:
        HonorINFs = true;
        HonorNaNs = true;
        // Turning on -ffast-math (with either flag) removes the need for
        // MathErrno. However, turning *off* -ffast-math merely restores the
        // toolchain default (which may be false).
        MathErrno = TC.IsMathErrnoDefault();
        AssociativeMath = false;
        ReciprocalMath = false;
        SignedZeros = true;
        TrappingMath = false;
        RoundingFPMath = false;
        // -fno_fast_math restores default denormal and fpcontract handling
        DenormalFPMath = DefaultDenormalFPMath;
        DenormalFP32Math = llvm::DenormalMode::getIEEE();
        FPContract = "";
        break;
      }
      if (StrictFPModel) {
        // If -ffp-model=strict has been specified on command line but
        // subsequent options conflict then emit warning diagnostic.
        if (HonorINFs && HonorNaNs &&
          !AssociativeMath && !ReciprocalMath &&
          SignedZeros && TrappingMath && RoundingFPMath &&
          (FPContract.equals("off") || FPContract.empty()) &&
          DenormalFPMath == llvm::DenormalMode::getIEEE() &&
          DenormalFP32Math == llvm::DenormalMode::getIEEE())
          // OK: Current Arg doesn't conflict with -ffp-model=strict
          ;
        else {
          StrictFPModel = false;
          FPModel = "";
          D.Diag(clang::diag::warn_drv_overriding_flag_option)
              << "-ffp-model=strict" <<
              ((A->getNumValues() == 0) ?  A->getSpelling()
              : Args.MakeArgString(A->getSpelling() + A->getValue()));
        }
      }
  
      // If we handled this option claim it
      A->claim();
    }
  
    if (!HonorINFs)
      CmdArgs.push_back("-menable-no-infs");
  
    if (!HonorNaNs)
      CmdArgs.push_back("-menable-no-nans");
  
    if (MathErrno)
      CmdArgs.push_back("-fmath-errno");
  
    if (!MathErrno && AssociativeMath && ReciprocalMath && !SignedZeros &&
        !TrappingMath)
      CmdArgs.push_back("-menable-unsafe-fp-math");
  
    if (!SignedZeros)
      CmdArgs.push_back("-fno-signed-zeros");
  
    if (AssociativeMath && !SignedZeros && !TrappingMath)
      CmdArgs.push_back("-mreassociate");
  
    if (ReciprocalMath)
      CmdArgs.push_back("-freciprocal-math");
  
    if (TrappingMath) {
      // FP Exception Behavior is also set to strict
      assert(FPExceptionBehavior.equals("strict"));
    }
  
    // The default is IEEE.
    if (DenormalFPMath != llvm::DenormalMode::getIEEE()) {
      llvm::SmallString<64> DenormFlag;
      llvm::raw_svector_ostream ArgStr(DenormFlag);
      ArgStr << "-fdenormal-fp-math=" << DenormalFPMath;
      CmdArgs.push_back(Args.MakeArgString(ArgStr.str()));
    }
  
    // Add f32 specific denormal mode flag if it's different.
    if (DenormalFP32Math != DenormalFPMath) {
      llvm::SmallString<64> DenormFlag;
      llvm::raw_svector_ostream ArgStr(DenormFlag);
      ArgStr << "-fdenormal-fp-math-f32=" << DenormalFP32Math;
      CmdArgs.push_back(Args.MakeArgString(ArgStr.str()));
    }
  
    if (!FPContract.empty())
      CmdArgs.push_back(Args.MakeArgString("-ffp-contract=" + FPContract));
  
    if (!RoundingFPMath)
      CmdArgs.push_back(Args.MakeArgString("-fno-rounding-math"));
  
    if (RoundingFPMath && RoundingMathPresent)
      CmdArgs.push_back(Args.MakeArgString("-frounding-math"));
  
    if (!FPExceptionBehavior.empty())
      CmdArgs.push_back(Args.MakeArgString("-ffp-exception-behavior=" +
                        FPExceptionBehavior));
  
    ParseMRecip(D, Args, CmdArgs);
  
    // -ffast-math enables the __FAST_MATH__ preprocessor macro, but check for the
    // individual features enabled by -ffast-math instead of the option itself as
    // that's consistent with gcc's behaviour.
    if (!HonorINFs && !HonorNaNs && !MathErrno && AssociativeMath &&
        ReciprocalMath && !SignedZeros && !TrappingMath && !RoundingFPMath) {
      CmdArgs.push_back("-ffast-math");
      if (FPModel.equals("fast")) {
        if (FPContract.equals("fast"))
          // All set, do nothing.
          ;
        else if (FPContract.empty())
          // Enable -ffp-contract=fast
          CmdArgs.push_back(Args.MakeArgString("-ffp-contract=fast"));
        else
          D.Diag(clang::diag::warn_drv_overriding_flag_option)
            << "-ffp-model=fast"
            << Args.MakeArgString("-ffp-contract=" + FPContract);
      }
    }
  
    // Handle __FINITE_MATH_ONLY__ similarly.
    if (!HonorINFs && !HonorNaNs)
      CmdArgs.push_back("-ffinite-math-only");
  
    if (const Arg *A = Args.getLastArg(options::OPT_mfpmath_EQ)) {
      CmdArgs.push_back("-mfpmath");
      CmdArgs.push_back(A->getValue());
    }
  
    // Disable a codegen optimization for floating-point casts.
    if (Args.hasFlag(options::OPT_fno_strict_float_cast_overflow,
                     options::OPT_fstrict_float_cast_overflow, false))
      CmdArgs.push_back("-fno-strict-float-cast-overflow");
  }
  
  static void RenderAnalyzerOptions(const ArgList &Args, ArgStringList &CmdArgs,
                                    const llvm::Triple &Triple,
                                    const InputInfo &Input) {
    // Enable region store model by default.
    CmdArgs.push_back("-analyzer-store=region");
  
    // Treat blocks as analysis entry points.
    CmdArgs.push_back("-analyzer-opt-analyze-nested-blocks");
  
    // Add default argument set.
    if (!Args.hasArg(options::OPT__analyzer_no_default_checks)) {
      CmdArgs.push_back("-analyzer-checker=core");
      CmdArgs.push_back("-analyzer-checker=apiModeling");
  
      if (!Triple.isWindowsMSVCEnvironment()) {
        CmdArgs.push_back("-analyzer-checker=unix");
      } else {
        // Enable "unix" checkers that also work on Windows.
        CmdArgs.push_back("-analyzer-checker=unix.API");
        CmdArgs.push_back("-analyzer-checker=unix.Malloc");
        CmdArgs.push_back("-analyzer-checker=unix.MallocSizeof");
        CmdArgs.push_back("-analyzer-checker=unix.MismatchedDeallocator");
        CmdArgs.push_back("-analyzer-checker=unix.cstring.BadSizeArg");
        CmdArgs.push_back("-analyzer-checker=unix.cstring.NullArg");
      }
  
      // Disable some unix checkers for PS4.
      if (Triple.isPS4CPU()) {
        CmdArgs.push_back("-analyzer-disable-checker=unix.API");
        CmdArgs.push_back("-analyzer-disable-checker=unix.Vfork");
      }
  
      if (Triple.isOSDarwin()) {
        CmdArgs.push_back("-analyzer-checker=osx");
        CmdArgs.push_back(
            "-analyzer-checker=security.insecureAPI.decodeValueOfObjCType");
      }
      else if (Triple.isOSFuchsia())
        CmdArgs.push_back("-analyzer-checker=fuchsia");
  
      CmdArgs.push_back("-analyzer-checker=deadcode");
  
      if (types::isCXX(Input.getType()))
        CmdArgs.push_back("-analyzer-checker=cplusplus");
  
      if (!Triple.isPS4CPU()) {
        CmdArgs.push_back("-analyzer-checker=security.insecureAPI.UncheckedReturn");
        CmdArgs.push_back("-analyzer-checker=security.insecureAPI.getpw");
        CmdArgs.push_back("-analyzer-checker=security.insecureAPI.gets");
        CmdArgs.push_back("-analyzer-checker=security.insecureAPI.mktemp");
        CmdArgs.push_back("-analyzer-checker=security.insecureAPI.mkstemp");
        CmdArgs.push_back("-analyzer-checker=security.insecureAPI.vfork");
      }
  
      // Default nullability checks.
      CmdArgs.push_back("-analyzer-checker=nullability.NullPassedToNonnull");
      CmdArgs.push_back("-analyzer-checker=nullability.NullReturnedFromNonnull");
    }
  
    // Set the output format. The default is plist, for (lame) historical reasons.
    CmdArgs.push_back("-analyzer-output");
    if (Arg *A = Args.getLastArg(options::OPT__analyzer_output))
      CmdArgs.push_back(A->getValue());
    else
      CmdArgs.push_back("plist");
  
    // Disable the presentation of standard compiler warnings when using
    // --analyze.  We only want to show static analyzer diagnostics or frontend
    // errors.
    CmdArgs.push_back("-w");
  
    // Add -Xanalyzer arguments when running as analyzer.
    Args.AddAllArgValues(CmdArgs, options::OPT_Xanalyzer);
  }
  
  static void RenderSSPOptions(const Driver &D, const ToolChain &TC,
                               const ArgList &Args, ArgStringList &CmdArgs,
                               bool KernelOrKext) {
    const llvm::Triple &EffectiveTriple = TC.getEffectiveTriple();
  
    // NVPTX doesn't support stack protectors; from the compiler's perspective, it
    // doesn't even have a stack!
    if (EffectiveTriple.isNVPTX())
      return;
  
    // -stack-protector=0 is default.
    LangOptions::StackProtectorMode StackProtectorLevel = LangOptions::SSPOff;
    LangOptions::StackProtectorMode DefaultStackProtectorLevel =
        TC.GetDefaultStackProtectorLevel(KernelOrKext);
  
    if (Arg *A = Args.getLastArg(options::OPT_fno_stack_protector,
                                 options::OPT_fstack_protector_all,
                                 options::OPT_fstack_protector_strong,
                                 options::OPT_fstack_protector)) {
      if (A->getOption().matches(options::OPT_fstack_protector))
        StackProtectorLevel =
            std::max<>(LangOptions::SSPOn, DefaultStackProtectorLevel);
      else if (A->getOption().matches(options::OPT_fstack_protector_strong))
        StackProtectorLevel = LangOptions::SSPStrong;
      else if (A->getOption().matches(options::OPT_fstack_protector_all))
        StackProtectorLevel = LangOptions::SSPReq;
    } else {
      StackProtectorLevel = DefaultStackProtectorLevel;
    }
  
    if (StackProtectorLevel) {
      CmdArgs.push_back("-stack-protector");
      CmdArgs.push_back(Args.MakeArgString(Twine(StackProtectorLevel)));
    }
  
    // --param ssp-buffer-size=
    for (const Arg *A : Args.filtered(options::OPT__param)) {
      StringRef Str(A->getValue());
      if (Str.startswith("ssp-buffer-size=")) {
        if (StackProtectorLevel) {
          CmdArgs.push_back("-stack-protector-buffer-size");
          // FIXME: Verify the argument is a valid integer.
          CmdArgs.push_back(Args.MakeArgString(Str.drop_front(16)));
        }
        A->claim();
      }
    }
  
    const std::string &TripleStr = EffectiveTriple.getTriple();
    if (Arg *A = Args.getLastArg(options::OPT_mstack_protector_guard_EQ)) {
      StringRef Value = A->getValue();
      if (!EffectiveTriple.isX86() && !EffectiveTriple.isAArch64())
        D.Diag(diag::err_drv_unsupported_opt_for_target)
            << A->getAsString(Args) << TripleStr;
      if (EffectiveTriple.isX86() && Value != "tls" && Value != "global") {
        D.Diag(diag::err_drv_invalid_value_with_suggestion)
            << A->getOption().getName() << Value << "tls global";
        return;
      }
      if (EffectiveTriple.isAArch64() && Value != "sysreg" && Value != "global") {
        D.Diag(diag::err_drv_invalid_value_with_suggestion)
            << A->getOption().getName() << Value << "sysreg global";
        return;
      }
      A->render(Args, CmdArgs);
    }
  
    if (Arg *A = Args.getLastArg(options::OPT_mstack_protector_guard_offset_EQ)) {
      StringRef Value = A->getValue();
      if (!EffectiveTriple.isX86() && !EffectiveTriple.isAArch64())
        D.Diag(diag::err_drv_unsupported_opt_for_target)
            << A->getAsString(Args) << TripleStr;
      int Offset;
      if (Value.getAsInteger(10, Offset)) {
        D.Diag(diag::err_drv_invalid_value) << A->getOption().getName() << Value;
        return;
      }
      A->render(Args, CmdArgs);
    }
  
    if (Arg *A = Args.getLastArg(options::OPT_mstack_protector_guard_reg_EQ)) {
      StringRef Value = A->getValue();
      if (!EffectiveTriple.isX86() && !EffectiveTriple.isAArch64())
        D.Diag(diag::err_drv_unsupported_opt_for_target)
            << A->getAsString(Args) << TripleStr;
      if (EffectiveTriple.isX86() && (Value != "fs" && Value != "gs")) {
        D.Diag(diag::err_drv_invalid_value_with_suggestion)
            << A->getOption().getName() << Value << "fs gs";
        return;
      }
      if (EffectiveTriple.isAArch64() && Value != "sp_el0") {
        D.Diag(diag::err_drv_invalid_value) << A->getOption().getName() << Value;
        return;
      }
      A->render(Args, CmdArgs);
    }
  }
  
  static void RenderSCPOptions(const ToolChain &TC, const ArgList &Args,
                               ArgStringList &CmdArgs) {
    const llvm::Triple &EffectiveTriple = TC.getEffectiveTriple();
  
    if (!EffectiveTriple.isOSLinux())
      return;
  
    if (!EffectiveTriple.isX86() && !EffectiveTriple.isSystemZ() &&
        !EffectiveTriple.isPPC64())
      return;
  
    if (Args.hasFlag(options::OPT_fstack_clash_protection,
                     options::OPT_fno_stack_clash_protection, false))
      CmdArgs.push_back("-fstack-clash-protection");
  }
  
  static void RenderTrivialAutoVarInitOptions(const Driver &D,
                                              const ToolChain &TC,
                                              const ArgList &Args,
                                              ArgStringList &CmdArgs) {
    auto DefaultTrivialAutoVarInit = TC.GetDefaultTrivialAutoVarInit();
    StringRef TrivialAutoVarInit = "";
  
    for (const Arg *A : Args) {
      switch (A->getOption().getID()) {
      default:
        continue;
      case options::OPT_ftrivial_auto_var_init: {
        A->claim();
        StringRef Val = A->getValue();
        if (Val == "uninitialized" || Val == "zero" || Val == "pattern")
          TrivialAutoVarInit = Val;
        else
          D.Diag(diag::err_drv_unsupported_option_argument)
              << A->getOption().getName() << Val;
        break;
      }
      }
    }
  
    if (TrivialAutoVarInit.empty())
      switch (DefaultTrivialAutoVarInit) {
      case LangOptions::TrivialAutoVarInitKind::Uninitialized:
        break;
      case LangOptions::TrivialAutoVarInitKind::Pattern:
        TrivialAutoVarInit = "pattern";
        break;
      case LangOptions::TrivialAutoVarInitKind::Zero:
        TrivialAutoVarInit = "zero";
        break;
      }
  
    if (!TrivialAutoVarInit.empty()) {
      if (TrivialAutoVarInit == "zero" && !Args.hasArg(options::OPT_enable_trivial_var_init_zero))
        D.Diag(diag::err_drv_trivial_auto_var_init_zero_disabled);
      CmdArgs.push_back(
          Args.MakeArgString("-ftrivial-auto-var-init=" + TrivialAutoVarInit));
    }
  
    if (Arg *A =
            Args.getLastArg(options::OPT_ftrivial_auto_var_init_stop_after)) {
      if (!Args.hasArg(options::OPT_ftrivial_auto_var_init) ||
          StringRef(
              Args.getLastArg(options::OPT_ftrivial_auto_var_init)->getValue()) ==
              "uninitialized")
        D.Diag(diag::err_drv_trivial_auto_var_init_stop_after_missing_dependency);
      A->claim();
      StringRef Val = A->getValue();
      if (std::stoi(Val.str()) <= 0)
        D.Diag(diag::err_drv_trivial_auto_var_init_stop_after_invalid_value);
      CmdArgs.push_back(
          Args.MakeArgString("-ftrivial-auto-var-init-stop-after=" + Val));
    }
  }
  
  static void RenderOpenCLOptions(const ArgList &Args, ArgStringList &CmdArgs,
                                  types::ID InputType) {
    // cl-denorms-are-zero is not forwarded. It is translated into a generic flag
    // for denormal flushing handling based on the target.
    const unsigned ForwardedArguments[] = {
        options::OPT_cl_opt_disable,
        options::OPT_cl_strict_aliasing,
        options::OPT_cl_single_precision_constant,
        options::OPT_cl_finite_math_only,
        options::OPT_cl_kernel_arg_info,
        options::OPT_cl_unsafe_math_optimizations,
        options::OPT_cl_fast_relaxed_math,
        options::OPT_cl_mad_enable,
        options::OPT_cl_no_signed_zeros,
        options::OPT_cl_fp32_correctly_rounded_divide_sqrt,
        options::OPT_cl_uniform_work_group_size
    };
  
    if (Arg *A = Args.getLastArg(options::OPT_cl_std_EQ)) {
      std::string CLStdStr = std::string("-cl-std=") + A->getValue();
      CmdArgs.push_back(Args.MakeArgString(CLStdStr));
    }
  
    for (const auto &Arg : ForwardedArguments)
      if (const auto *A = Args.getLastArg(Arg))
        CmdArgs.push_back(Args.MakeArgString(A->getOption().getPrefixedName()));
  
    // Only add the default headers if we are compiling OpenCL sources.
    if ((types::isOpenCL(InputType) ||
         (Args.hasArg(options::OPT_cl_std_EQ) && types::isSrcFile(InputType))) &&
        !Args.hasArg(options::OPT_cl_no_stdinc)) {
      CmdArgs.push_back("-finclude-default-header");
      CmdArgs.push_back("-fdeclare-opencl-builtins");
    }
  }
  
  static void RenderARCMigrateToolOptions(const Driver &D, const ArgList &Args,
                                          ArgStringList &CmdArgs) {
    bool ARCMTEnabled = false;
    if (!Args.hasArg(options::OPT_fno_objc_arc, options::OPT_fobjc_arc)) {
      if (const Arg *A = Args.getLastArg(options::OPT_ccc_arcmt_check,
                                         options::OPT_ccc_arcmt_modify,
                                         options::OPT_ccc_arcmt_migrate)) {
        ARCMTEnabled = true;
        switch (A->getOption().getID()) {
        default: llvm_unreachable("missed a case");
        case options::OPT_ccc_arcmt_check:
          CmdArgs.push_back("-arcmt-action=check");
          break;
        case options::OPT_ccc_arcmt_modify:
          CmdArgs.push_back("-arcmt-action=modify");
          break;
        case options::OPT_ccc_arcmt_migrate:
          CmdArgs.push_back("-arcmt-action=migrate");
          CmdArgs.push_back("-mt-migrate-directory");
          CmdArgs.push_back(A->getValue());
  
          Args.AddLastArg(CmdArgs, options::OPT_arcmt_migrate_report_output);
          Args.AddLastArg(CmdArgs, options::OPT_arcmt_migrate_emit_arc_errors);
          break;
        }
      }
    } else {
      Args.ClaimAllArgs(options::OPT_ccc_arcmt_check);
      Args.ClaimAllArgs(options::OPT_ccc_arcmt_modify);
      Args.ClaimAllArgs(options::OPT_ccc_arcmt_migrate);
    }
  
    if (const Arg *A = Args.getLastArg(options::OPT_ccc_objcmt_migrate)) {
      if (ARCMTEnabled)
        D.Diag(diag::err_drv_argument_not_allowed_with)
            << A->getAsString(Args) << "-ccc-arcmt-migrate";
  
      CmdArgs.push_back("-mt-migrate-directory");
      CmdArgs.push_back(A->getValue());
  
      if (!Args.hasArg(options::OPT_objcmt_migrate_literals,
                       options::OPT_objcmt_migrate_subscripting,
                       options::OPT_objcmt_migrate_property)) {
        // None specified, means enable them all.
        CmdArgs.push_back("-objcmt-migrate-literals");
        CmdArgs.push_back("-objcmt-migrate-subscripting");
        CmdArgs.push_back("-objcmt-migrate-property");
      } else {
        Args.AddLastArg(CmdArgs, options::OPT_objcmt_migrate_literals);
        Args.AddLastArg(CmdArgs, options::OPT_objcmt_migrate_subscripting);
        Args.AddLastArg(CmdArgs, options::OPT_objcmt_migrate_property);
      }
    } else {
      Args.AddLastArg(CmdArgs, options::OPT_objcmt_migrate_literals);
      Args.AddLastArg(CmdArgs, options::OPT_objcmt_migrate_subscripting);
      Args.AddLastArg(CmdArgs, options::OPT_objcmt_migrate_property);
      Args.AddLastArg(CmdArgs, options::OPT_objcmt_migrate_all);
      Args.AddLastArg(CmdArgs, options::OPT_objcmt_migrate_readonly_property);
      Args.AddLastArg(CmdArgs, options::OPT_objcmt_migrate_readwrite_property);
      Args.AddLastArg(CmdArgs, options::OPT_objcmt_migrate_property_dot_syntax);
      Args.AddLastArg(CmdArgs, options::OPT_objcmt_migrate_annotation);
      Args.AddLastArg(CmdArgs, options::OPT_objcmt_migrate_instancetype);
      Args.AddLastArg(CmdArgs, options::OPT_objcmt_migrate_nsmacros);
      Args.AddLastArg(CmdArgs, options::OPT_objcmt_migrate_protocol_conformance);
      Args.AddLastArg(CmdArgs, options::OPT_objcmt_atomic_property);
      Args.AddLastArg(CmdArgs, options::OPT_objcmt_returns_innerpointer_property);
      Args.AddLastArg(CmdArgs, options::OPT_objcmt_ns_nonatomic_iosonly);
      Args.AddLastArg(CmdArgs, options::OPT_objcmt_migrate_designated_init);
      Args.AddLastArg(CmdArgs, options::OPT_objcmt_whitelist_dir_path);
    }
  }
  
  static void RenderBuiltinOptions(const ToolChain &TC, const llvm::Triple &T,
                                   const ArgList &Args, ArgStringList &CmdArgs) {
    // -fbuiltin is default unless -mkernel is used.
    bool UseBuiltins =
        Args.hasFlag(options::OPT_fbuiltin, options::OPT_fno_builtin,
                     !Args.hasArg(options::OPT_mkernel));
    if (!UseBuiltins)
      CmdArgs.push_back("-fno-builtin");
  
    // -ffreestanding implies -fno-builtin.
    if (Args.hasArg(options::OPT_ffreestanding))
      UseBuiltins = false;
  
    // Process the -fno-builtin-* options.
    for (const auto &Arg : Args) {
      const Option &O = Arg->getOption();
      if (!O.matches(options::OPT_fno_builtin_))
        continue;
  
      Arg->claim();
  
      // If -fno-builtin is specified, then there's no need to pass the option to
      // the frontend.
      if (!UseBuiltins)
        continue;
  
      StringRef FuncName = Arg->getValue();
      CmdArgs.push_back(Args.MakeArgString("-fno-builtin-" + FuncName));
    }
  
    // le32-specific flags:
    //  -fno-math-builtin: clang should not convert math builtins to intrinsics
    //                     by default.
    if (TC.getArch() == llvm::Triple::le32)
      CmdArgs.push_back("-fno-math-builtin");
  }
  
  bool Driver::getDefaultModuleCachePath(SmallVectorImpl<char> &Result) {
    if (llvm::sys::path::cache_directory(Result)) {
      llvm::sys::path::append(Result, "clang");
      llvm::sys::path::append(Result, "ModuleCache");
      return true;
    }
    return false;
  }
  
  static void RenderModulesOptions(Compilation &C, const Driver &D,
                                   const ArgList &Args, const InputInfo &Input,
                                   const InputInfo &Output,
                                   ArgStringList &CmdArgs, bool &HaveModules) {
    // -fmodules enables the use of precompiled modules (off by default).
    // Users can pass -fno-cxx-modules to turn off modules support for
    // C++/Objective-C++ programs.
    bool HaveClangModules = false;
    if (Args.hasFlag(options::OPT_fmodules, options::OPT_fno_modules, false)) {
      bool AllowedInCXX = Args.hasFlag(options::OPT_fcxx_modules,
                                       options::OPT_fno_cxx_modules, true);
      if (AllowedInCXX || !types::isCXX(Input.getType())) {
        CmdArgs.push_back("-fmodules");
        HaveClangModules = true;
      }
    }
  
    HaveModules |= HaveClangModules;
    if (Args.hasArg(options::OPT_fmodules_ts)) {
      CmdArgs.push_back("-fmodules-ts");
      HaveModules = true;
    }
  
    // -fmodule-maps enables implicit reading of module map files. By default,
    // this is enabled if we are using Clang's flavor of precompiled modules.
    if (Args.hasFlag(options::OPT_fimplicit_module_maps,
                     options::OPT_fno_implicit_module_maps, HaveClangModules))
      CmdArgs.push_back("-fimplicit-module-maps");
  
    // -fmodules-decluse checks that modules used are declared so (off by default)
    if (Args.hasFlag(options::OPT_fmodules_decluse,
                     options::OPT_fno_modules_decluse, false))
      CmdArgs.push_back("-fmodules-decluse");
  
    // -fmodules-strict-decluse is like -fmodule-decluse, but also checks that
    // all #included headers are part of modules.
    if (Args.hasFlag(options::OPT_fmodules_strict_decluse,
                     options::OPT_fno_modules_strict_decluse, false))
      CmdArgs.push_back("-fmodules-strict-decluse");
  
    // -fno-implicit-modules turns off implicitly compiling modules on demand.
    bool ImplicitModules = false;
    if (!Args.hasFlag(options::OPT_fimplicit_modules,
                      options::OPT_fno_implicit_modules, HaveClangModules)) {
      if (HaveModules)
        CmdArgs.push_back("-fno-implicit-modules");
    } else if (HaveModules) {
      ImplicitModules = true;
      // -fmodule-cache-path specifies where our implicitly-built module files
      // should be written.
      SmallString<128> Path;
      if (Arg *A = Args.getLastArg(options::OPT_fmodules_cache_path))
        Path = A->getValue();
  
      bool HasPath = true;
      if (C.isForDiagnostics()) {
        // When generating crash reports, we want to emit the modules along with
        // the reproduction sources, so we ignore any provided module path.
        Path = Output.getFilename();
        llvm::sys::path::replace_extension(Path, ".cache");
        llvm::sys::path::append(Path, "modules");
      } else if (Path.empty()) {
        // No module path was provided: use the default.
        HasPath = Driver::getDefaultModuleCachePath(Path);
      }
  
      // `HasPath` will only be false if getDefaultModuleCachePath() fails.
      // That being said, that failure is unlikely and not caching is harmless.
      if (HasPath) {
        const char Arg[] = "-fmodules-cache-path=";
        Path.insert(Path.begin(), Arg, Arg + strlen(Arg));
        CmdArgs.push_back(Args.MakeArgString(Path));
      }
    }
  
    if (HaveModules) {
      // -fprebuilt-module-path specifies where to load the prebuilt module files.
      for (const Arg *A : Args.filtered(options::OPT_fprebuilt_module_path)) {
        CmdArgs.push_back(Args.MakeArgString(
            std::string("-fprebuilt-module-path=") + A->getValue()));
        A->claim();
      }
      if (Args.hasFlag(options::OPT_fprebuilt_implicit_modules,
                       options::OPT_fno_prebuilt_implicit_modules, false))
        CmdArgs.push_back("-fprebuilt-implicit-modules");
      if (Args.hasFlag(options::OPT_fmodules_validate_input_files_content,
                       options::OPT_fno_modules_validate_input_files_content,
                       false))
        CmdArgs.push_back("-fvalidate-ast-input-files-content");
    }
  
    // -fmodule-name specifies the module that is currently being built (or
    // used for header checking by -fmodule-maps).
    Args.AddLastArg(CmdArgs, options::OPT_fmodule_name_EQ);
  
    // -fmodule-map-file can be used to specify files containing module
    // definitions.
    Args.AddAllArgs(CmdArgs, options::OPT_fmodule_map_file);
  
    // -fbuiltin-module-map can be used to load the clang
    // builtin headers modulemap file.
    if (Args.hasArg(options::OPT_fbuiltin_module_map)) {
      SmallString<128> BuiltinModuleMap(D.ResourceDir);
      llvm::sys::path::append(BuiltinModuleMap, "include");
      llvm::sys::path::append(BuiltinModuleMap, "module.modulemap");
      if (llvm::sys::fs::exists(BuiltinModuleMap))
        CmdArgs.push_back(
            Args.MakeArgString("-fmodule-map-file=" + BuiltinModuleMap));
    }
  
    // The -fmodule-file=<name>=<file> form specifies the mapping of module
    // names to precompiled module files (the module is loaded only if used).
    // The -fmodule-file=<file> form can be used to unconditionally load
    // precompiled module files (whether used or not).
    if (HaveModules)
      Args.AddAllArgs(CmdArgs, options::OPT_fmodule_file);
    else
      Args.ClaimAllArgs(options::OPT_fmodule_file);
  
    // When building modules and generating crashdumps, we need to dump a module
    // dependency VFS alongside the output.
    if (HaveClangModules && C.isForDiagnostics()) {
      SmallString<128> VFSDir(Output.getFilename());
      llvm::sys::path::replace_extension(VFSDir, ".cache");
      // Add the cache directory as a temp so the crash diagnostics pick it up.
      C.addTempFile(Args.MakeArgString(VFSDir));
  
      llvm::sys::path::append(VFSDir, "vfs");
      CmdArgs.push_back("-module-dependency-dir");
      CmdArgs.push_back(Args.MakeArgString(VFSDir));
    }
  
    if (HaveClangModules)
      Args.AddLastArg(CmdArgs, options::OPT_fmodules_user_build_path);
  
    // Pass through all -fmodules-ignore-macro arguments.
    Args.AddAllArgs(CmdArgs, options::OPT_fmodules_ignore_macro);
    Args.AddLastArg(CmdArgs, options::OPT_fmodules_prune_interval);
    Args.AddLastArg(CmdArgs, options::OPT_fmodules_prune_after);
  
    Args.AddLastArg(CmdArgs, options::OPT_fbuild_session_timestamp);
  
    if (Arg *A = Args.getLastArg(options::OPT_fbuild_session_file)) {
      if (Args.hasArg(options::OPT_fbuild_session_timestamp))
        D.Diag(diag::err_drv_argument_not_allowed_with)
            << A->getAsString(Args) << "-fbuild-session-timestamp";
  
      llvm::sys::fs::file_status Status;
      if (llvm::sys::fs::status(A->getValue(), Status))
        D.Diag(diag::err_drv_no_such_file) << A->getValue();
      CmdArgs.push_back(
          Args.MakeArgString("-fbuild-session-timestamp=" +
                             Twine((uint64_t)Status.getLastModificationTime()
                                       .time_since_epoch()
                                       .count())));
    }
  
    if (Args.getLastArg(options::OPT_fmodules_validate_once_per_build_session)) {
      if (!Args.getLastArg(options::OPT_fbuild_session_timestamp,
                           options::OPT_fbuild_session_file))
        D.Diag(diag::err_drv_modules_validate_once_requires_timestamp);
  
      Args.AddLastArg(CmdArgs,
                      options::OPT_fmodules_validate_once_per_build_session);
    }
  
    if (Args.hasFlag(options::OPT_fmodules_validate_system_headers,
                     options::OPT_fno_modules_validate_system_headers,
                     ImplicitModules))
      CmdArgs.push_back("-fmodules-validate-system-headers");
  
    Args.AddLastArg(CmdArgs, options::OPT_fmodules_disable_diagnostic_validation);
  }
  
  static void RenderCharacterOptions(const ArgList &Args, const llvm::Triple &T,
                                     ArgStringList &CmdArgs) {
    // -fsigned-char is default.
    if (const Arg *A = Args.getLastArg(options::OPT_fsigned_char,
                                       options::OPT_fno_signed_char,
                                       options::OPT_funsigned_char,
                                       options::OPT_fno_unsigned_char)) {
      if (A->getOption().matches(options::OPT_funsigned_char) ||
          A->getOption().matches(options::OPT_fno_signed_char)) {
        CmdArgs.push_back("-fno-signed-char");
      }
    } else if (!isSignedCharDefault(T)) {
      CmdArgs.push_back("-fno-signed-char");
    }
  
    // The default depends on the language standard.
    Args.AddLastArg(CmdArgs, options::OPT_fchar8__t, options::OPT_fno_char8__t);
  
    if (const Arg *A = Args.getLastArg(options::OPT_fshort_wchar,
                                       options::OPT_fno_short_wchar)) {
      if (A->getOption().matches(options::OPT_fshort_wchar)) {
        CmdArgs.push_back("-fwchar-type=short");
        CmdArgs.push_back("-fno-signed-wchar");
      } else {
        bool IsARM = T.isARM() || T.isThumb() || T.isAArch64();
        CmdArgs.push_back("-fwchar-type=int");
        if (T.isOSzOS() ||
            (IsARM && !(T.isOSWindows() || T.isOSNetBSD() || T.isOSOpenBSD())))
          CmdArgs.push_back("-fno-signed-wchar");
        else
          CmdArgs.push_back("-fsigned-wchar");
      }
    }
  }
  
  static void RenderObjCOptions(const ToolChain &TC, const Driver &D,
                                const llvm::Triple &T, const ArgList &Args,
                                ObjCRuntime &Runtime, bool InferCovariantReturns,
                                const InputInfo &Input, ArgStringList &CmdArgs) {
    const llvm::Triple::ArchType Arch = TC.getArch();
  
    // -fobjc-dispatch-method is only relevant with the nonfragile-abi, and legacy
    // is the default. Except for deployment target of 10.5, next runtime is
    // always legacy dispatch and -fno-objc-legacy-dispatch gets ignored silently.
    if (Runtime.isNonFragile()) {
      if (!Args.hasFlag(options::OPT_fobjc_legacy_dispatch,
                        options::OPT_fno_objc_legacy_dispatch,
                        Runtime.isLegacyDispatchDefaultForArch(Arch))) {
        if (TC.UseObjCMixedDispatch())
          CmdArgs.push_back("-fobjc-dispatch-method=mixed");
        else
          CmdArgs.push_back("-fobjc-dispatch-method=non-legacy");
      }
    }
  
    // When ObjectiveC legacy runtime is in effect on MacOSX, turn on the option
    // to do Array/Dictionary subscripting by default.
    if (Arch == llvm::Triple::x86 && T.isMacOSX() &&
        Runtime.getKind() == ObjCRuntime::FragileMacOSX && Runtime.isNeXTFamily())
      CmdArgs.push_back("-fobjc-subscripting-legacy-runtime");
  
    // Allow -fno-objc-arr to trump -fobjc-arr/-fobjc-arc.
    // NOTE: This logic is duplicated in ToolChains.cpp.
    if (isObjCAutoRefCount(Args)) {
      TC.CheckObjCARC();
  
      CmdArgs.push_back("-fobjc-arc");
  
      // FIXME: It seems like this entire block, and several around it should be
      // wrapped in isObjC, but for now we just use it here as this is where it
      // was being used previously.
      if (types::isCXX(Input.getType()) && types::isObjC(Input.getType())) {
        if (TC.GetCXXStdlibType(Args) == ToolChain::CST_Libcxx)
          CmdArgs.push_back("-fobjc-arc-cxxlib=libc++");
        else
          CmdArgs.push_back("-fobjc-arc-cxxlib=libstdc++");
      }
  
      // Allow the user to enable full exceptions code emission.
      // We default off for Objective-C, on for Objective-C++.
      if (Args.hasFlag(options::OPT_fobjc_arc_exceptions,
                       options::OPT_fno_objc_arc_exceptions,
                       /*Default=*/types::isCXX(Input.getType())))
        CmdArgs.push_back("-fobjc-arc-exceptions");
    }
  
    // Silence warning for full exception code emission options when explicitly
    // set to use no ARC.
    if (Args.hasArg(options::OPT_fno_objc_arc)) {
      Args.ClaimAllArgs(options::OPT_fobjc_arc_exceptions);
      Args.ClaimAllArgs(options::OPT_fno_objc_arc_exceptions);
    }
  
    // Allow the user to control whether messages can be converted to runtime
    // functions.
    if (types::isObjC(Input.getType())) {
      auto *Arg = Args.getLastArg(
          options::OPT_fobjc_convert_messages_to_runtime_calls,
          options::OPT_fno_objc_convert_messages_to_runtime_calls);
      if (Arg &&
          Arg->getOption().matches(
              options::OPT_fno_objc_convert_messages_to_runtime_calls))
        CmdArgs.push_back("-fno-objc-convert-messages-to-runtime-calls");
    }
  
    // -fobjc-infer-related-result-type is the default, except in the Objective-C
    // rewriter.
    if (InferCovariantReturns)
      CmdArgs.push_back("-fno-objc-infer-related-result-type");
  
    // Pass down -fobjc-weak or -fno-objc-weak if present.
    if (types::isObjC(Input.getType())) {
      auto WeakArg =
          Args.getLastArg(options::OPT_fobjc_weak, options::OPT_fno_objc_weak);
      if (!WeakArg) {
        // nothing to do
      } else if (!Runtime.allowsWeak()) {
        if (WeakArg->getOption().matches(options::OPT_fobjc_weak))
          D.Diag(diag::err_objc_weak_unsupported);
      } else {
        WeakArg->render(Args, CmdArgs);
      }
    }
  
    if (Args.hasArg(options::OPT_fobjc_disable_direct_methods_for_testing))
      CmdArgs.push_back("-fobjc-disable-direct-methods-for-testing");
  }
  
  static void RenderDiagnosticsOptions(const Driver &D, const ArgList &Args,
                                       ArgStringList &CmdArgs) {
    bool CaretDefault = true;
    bool ColumnDefault = true;
  
    if (const Arg *A = Args.getLastArg(options::OPT__SLASH_diagnostics_classic,
                                       options::OPT__SLASH_diagnostics_column,
                                       options::OPT__SLASH_diagnostics_caret)) {
      switch (A->getOption().getID()) {
      case options::OPT__SLASH_diagnostics_caret:
        CaretDefault = true;
        ColumnDefault = true;
        break;
      case options::OPT__SLASH_diagnostics_column:
        CaretDefault = false;
        ColumnDefault = true;
        break;
      case options::OPT__SLASH_diagnostics_classic:
        CaretDefault = false;
        ColumnDefault = false;
        break;
      }
    }
  
    // -fcaret-diagnostics is default.
    if (!Args.hasFlag(options::OPT_fcaret_diagnostics,
                      options::OPT_fno_caret_diagnostics, CaretDefault))
      CmdArgs.push_back("-fno-caret-diagnostics");
  
    // -fdiagnostics-fixit-info is default, only pass non-default.
    if (!Args.hasFlag(options::OPT_fdiagnostics_fixit_info,
                      options::OPT_fno_diagnostics_fixit_info))
      CmdArgs.push_back("-fno-diagnostics-fixit-info");
  
    // Enable -fdiagnostics-show-option by default.
    if (!Args.hasFlag(options::OPT_fdiagnostics_show_option,
                      options::OPT_fno_diagnostics_show_option, true))
      CmdArgs.push_back("-fno-diagnostics-show-option");
  
    if (const Arg *A =
            Args.getLastArg(options::OPT_fdiagnostics_show_category_EQ)) {
      CmdArgs.push_back("-fdiagnostics-show-category");
      CmdArgs.push_back(A->getValue());
    }
  
    if (Args.hasFlag(options::OPT_fdiagnostics_show_hotness,
                     options::OPT_fno_diagnostics_show_hotness, false))
      CmdArgs.push_back("-fdiagnostics-show-hotness");
  
    if (const Arg *A =
            Args.getLastArg(options::OPT_fdiagnostics_hotness_threshold_EQ)) {
      std::string Opt =
          std::string("-fdiagnostics-hotness-threshold=") + A->getValue();
      CmdArgs.push_back(Args.MakeArgString(Opt));
    }
  
    if (const Arg *A = Args.getLastArg(options::OPT_fdiagnostics_format_EQ)) {
      CmdArgs.push_back("-fdiagnostics-format");
      CmdArgs.push_back(A->getValue());
    }
  
    if (const Arg *A = Args.getLastArg(
            options::OPT_fdiagnostics_show_note_include_stack,
            options::OPT_fno_diagnostics_show_note_include_stack)) {
      const Option &O = A->getOption();
      if (O.matches(options::OPT_fdiagnostics_show_note_include_stack))
        CmdArgs.push_back("-fdiagnostics-show-note-include-stack");
      else
        CmdArgs.push_back("-fno-diagnostics-show-note-include-stack");
    }
  
    // Color diagnostics are parsed by the driver directly from argv and later
    // re-parsed to construct this job; claim any possible color diagnostic here
    // to avoid warn_drv_unused_argument and diagnose bad
    // OPT_fdiagnostics_color_EQ values.
    for (const Arg *A : Args) {
      const Option &O = A->getOption();
      if (!O.matches(options::OPT_fcolor_diagnostics) &&
          !O.matches(options::OPT_fdiagnostics_color) &&
          !O.matches(options::OPT_fno_color_diagnostics) &&
          !O.matches(options::OPT_fno_diagnostics_color) &&
          !O.matches(options::OPT_fdiagnostics_color_EQ))
        continue;
  
      if (O.matches(options::OPT_fdiagnostics_color_EQ)) {
        StringRef Value(A->getValue());
        if (Value != "always" && Value != "never" && Value != "auto")
          D.Diag(diag::err_drv_clang_unsupported)
              << ("-fdiagnostics-color=" + Value).str();
      }
      A->claim();
    }
  
    if (D.getDiags().getDiagnosticOptions().ShowColors)
      CmdArgs.push_back("-fcolor-diagnostics");
  
    if (Args.hasArg(options::OPT_fansi_escape_codes))
      CmdArgs.push_back("-fansi-escape-codes");
  
    if (!Args.hasFlag(options::OPT_fshow_source_location,
                      options::OPT_fno_show_source_location))
      CmdArgs.push_back("-fno-show-source-location");
  
    if (Args.hasArg(options::OPT_fdiagnostics_absolute_paths))
      CmdArgs.push_back("-fdiagnostics-absolute-paths");
  
    if (!Args.hasFlag(options::OPT_fshow_column, options::OPT_fno_show_column,
                      ColumnDefault))
      CmdArgs.push_back("-fno-show-column");
  
    if (!Args.hasFlag(options::OPT_fspell_checking,
                      options::OPT_fno_spell_checking))
      CmdArgs.push_back("-fno-spell-checking");
  }
  
  enum class DwarfFissionKind { None, Split, Single };
  
  static DwarfFissionKind getDebugFissionKind(const Driver &D,
                                              const ArgList &Args, Arg *&Arg) {
    Arg = Args.getLastArg(options::OPT_gsplit_dwarf, options::OPT_gsplit_dwarf_EQ,
                          options::OPT_gno_split_dwarf);
    if (!Arg || Arg->getOption().matches(options::OPT_gno_split_dwarf))
      return DwarfFissionKind::None;
  
    if (Arg->getOption().matches(options::OPT_gsplit_dwarf))
      return DwarfFissionKind::Split;
  
    StringRef Value = Arg->getValue();
    if (Value == "split")
      return DwarfFissionKind::Split;
    if (Value == "single")
      return DwarfFissionKind::Single;
  
    D.Diag(diag::err_drv_unsupported_option_argument)
        << Arg->getOption().getName() << Arg->getValue();
    return DwarfFissionKind::None;
  }
  
  static void renderDwarfFormat(const Driver &D, const llvm::Triple &T,
                                const ArgList &Args, ArgStringList &CmdArgs,
                                unsigned DwarfVersion) {
    auto *DwarfFormatArg =
        Args.getLastArg(options::OPT_gdwarf64, options::OPT_gdwarf32);
    if (!DwarfFormatArg)
      return;
  
    if (DwarfFormatArg->getOption().matches(options::OPT_gdwarf64)) {
      if (DwarfVersion < 3)
        D.Diag(diag::err_drv_argument_only_allowed_with)
            << DwarfFormatArg->getAsString(Args) << "DWARFv3 or greater";
      else if (!T.isArch64Bit())
        D.Diag(diag::err_drv_argument_only_allowed_with)
            << DwarfFormatArg->getAsString(Args) << "64 bit architecture";
      else if (!T.isOSBinFormatELF())
        D.Diag(diag::err_drv_argument_only_allowed_with)
            << DwarfFormatArg->getAsString(Args) << "ELF platforms";
    }
  
    DwarfFormatArg->render(Args, CmdArgs);
  }
  
  static void renderDebugOptions(const ToolChain &TC, const Driver &D,
                                 const llvm::Triple &T, const ArgList &Args,
                                 bool EmitCodeView, bool IRInput,
                                 ArgStringList &CmdArgs,
                                 codegenoptions::DebugInfoKind &DebugInfoKind,
                                 DwarfFissionKind &DwarfFission) {
    // These two forms of profiling info can't be used together.
    if (const Arg *A1 = Args.getLastArg(options::OPT_fpseudo_probe_for_profiling))
      if (const Arg *A2 = Args.getLastArg(options::OPT_fdebug_info_for_profiling))
        D.Diag(diag::err_drv_argument_not_allowed_with)
            << A1->getAsString(Args) << A2->getAsString(Args);
  
    if (Args.hasFlag(options::OPT_fdebug_info_for_profiling,
                     options::OPT_fno_debug_info_for_profiling, false) &&
        checkDebugInfoOption(
            Args.getLastArg(options::OPT_fdebug_info_for_profiling), Args, D, TC))
      CmdArgs.push_back("-fdebug-info-for-profiling");
  
    // The 'g' groups options involve a somewhat intricate sequence of decisions
    // about what to pass from the driver to the frontend, but by the time they
    // reach cc1 they've been factored into three well-defined orthogonal choices:
    //  * what level of debug info to generate
    //  * what dwarf version to write
    //  * what debugger tuning to use
    // This avoids having to monkey around further in cc1 other than to disable
    // codeview if not running in a Windows environment. Perhaps even that
    // decision should be made in the driver as well though.
    llvm::DebuggerKind DebuggerTuning = TC.getDefaultDebuggerTuning();
  
    bool SplitDWARFInlining =
        Args.hasFlag(options::OPT_fsplit_dwarf_inlining,
                     options::OPT_fno_split_dwarf_inlining, false);
  
    // Normally -gsplit-dwarf is only useful with -gN. For IR input, Clang does
    // object file generation and no IR generation, -gN should not be needed. So
    // allow -gsplit-dwarf with either -gN or IR input.
    if (IRInput || Args.hasArg(options::OPT_g_Group)) {
      Arg *SplitDWARFArg;
      DwarfFission = getDebugFissionKind(D, Args, SplitDWARFArg);
      if (DwarfFission != DwarfFissionKind::None &&
          !checkDebugInfoOption(SplitDWARFArg, Args, D, TC)) {
        DwarfFission = DwarfFissionKind::None;
        SplitDWARFInlining = false;
      }
    }
    if (const Arg *A = Args.getLastArg(options::OPT_g_Group)) {
      DebugInfoKind = codegenoptions::LimitedDebugInfo;
  
      // If the last option explicitly specified a debug-info level, use it.
      if (checkDebugInfoOption(A, Args, D, TC) &&
          A->getOption().matches(options::OPT_gN_Group)) {
        DebugInfoKind = DebugLevelToInfoKind(*A);
        // For -g0 or -gline-tables-only, drop -gsplit-dwarf. This gets a bit more
        // complicated if you've disabled inline info in the skeleton CUs
        // (SplitDWARFInlining) - then there's value in composing split-dwarf and
        // line-tables-only, so let those compose naturally in that case.
        if (DebugInfoKind == codegenoptions::NoDebugInfo ||
            DebugInfoKind == codegenoptions::DebugDirectivesOnly ||
            (DebugInfoKind == codegenoptions::DebugLineTablesOnly &&
             SplitDWARFInlining))
          DwarfFission = DwarfFissionKind::None;
      }
    }
  
    // If a debugger tuning argument appeared, remember it.
    if (const Arg *A =
            Args.getLastArg(options::OPT_gTune_Group, options::OPT_ggdbN_Group)) {
      if (checkDebugInfoOption(A, Args, D, TC)) {
        if (A->getOption().matches(options::OPT_glldb))
          DebuggerTuning = llvm::DebuggerKind::LLDB;
        else if (A->getOption().matches(options::OPT_gsce))
          DebuggerTuning = llvm::DebuggerKind::SCE;
        else if (A->getOption().matches(options::OPT_gdbx))
          DebuggerTuning = llvm::DebuggerKind::DBX;
        else
          DebuggerTuning = llvm::DebuggerKind::GDB;
      }
    }
  
    // If a -gdwarf argument appeared, remember it.
    const Arg *GDwarfN = getDwarfNArg(Args);
    bool EmitDwarf = false;
    if (GDwarfN) {
      if (checkDebugInfoOption(GDwarfN, Args, D, TC))
        EmitDwarf = true;
      else
        GDwarfN = nullptr;
    }
  
    if (const Arg *A = Args.getLastArg(options::OPT_gcodeview)) {
      if (checkDebugInfoOption(A, Args, D, TC))
        EmitCodeView = true;
    }
  
    // If the user asked for debug info but did not explicitly specify -gcodeview
    // or -gdwarf, ask the toolchain for the default format.
    if (!EmitCodeView && !EmitDwarf &&
        DebugInfoKind != codegenoptions::NoDebugInfo) {
      switch (TC.getDefaultDebugFormat()) {
      case codegenoptions::DIF_CodeView:
        EmitCodeView = true;
        break;
      case codegenoptions::DIF_DWARF:
        EmitDwarf = true;
        break;
      }
    }
  
    unsigned RequestedDWARFVersion = 0; // DWARF version requested by the user
    unsigned EffectiveDWARFVersion = 0; // DWARF version TC can generate. It may
                                        // be lower than what the user wanted.
    unsigned DefaultDWARFVersion = ParseDebugDefaultVersion(TC, Args);
    if (EmitDwarf) {
      // Start with the platform default DWARF version
      RequestedDWARFVersion = TC.GetDefaultDwarfVersion();
      assert(RequestedDWARFVersion &&
             "toolchain default DWARF version must be nonzero");
  
      // If the user specified a default DWARF version, that takes precedence
      // over the platform default.
      if (DefaultDWARFVersion)
        RequestedDWARFVersion = DefaultDWARFVersion;
  
      // Override with a user-specified DWARF version
      if (GDwarfN)
        if (auto ExplicitVersion = DwarfVersionNum(GDwarfN->getSpelling()))
          RequestedDWARFVersion = ExplicitVersion;
      // Clamp effective DWARF version to the max supported by the toolchain.
      EffectiveDWARFVersion =
          std::min(RequestedDWARFVersion, TC.getMaxDwarfVersion());
    }
  
    // -gline-directives-only supported only for the DWARF debug info.
    if (RequestedDWARFVersion == 0 &&
        DebugInfoKind == codegenoptions::DebugDirectivesOnly)
      DebugInfoKind = codegenoptions::NoDebugInfo;
  
    // strict DWARF is set to false by default. But for DBX, we need it to be set
    // as true by default.
    if (const Arg *A = Args.getLastArg(options::OPT_gstrict_dwarf))
      (void)checkDebugInfoOption(A, Args, D, TC);
    if (Args.hasFlag(options::OPT_gstrict_dwarf, options::OPT_gno_strict_dwarf,
                     DebuggerTuning == llvm::DebuggerKind::DBX))
      CmdArgs.push_back("-gstrict-dwarf");
  
    // And we handle flag -grecord-gcc-switches later with DWARFDebugFlags.
    Args.ClaimAllArgs(options::OPT_g_flags_Group);
  
    // Column info is included by default for everything except SCE and
    // CodeView. Clang doesn't track end columns, just starting columns, which,
    // in theory, is fine for CodeView (and PDB).  In practice, however, the
    // Microsoft debuggers don't handle missing end columns well, and the AIX
    // debugger DBX also doesn't handle the columns well, so it's better not to
    // include any column info.
    if (const Arg *A = Args.getLastArg(options::OPT_gcolumn_info))
      (void)checkDebugInfoOption(A, Args, D, TC);
    if (!Args.hasFlag(options::OPT_gcolumn_info, options::OPT_gno_column_info,
                      !EmitCodeView &&
                          (DebuggerTuning != llvm::DebuggerKind::SCE &&
                           DebuggerTuning != llvm::DebuggerKind::DBX)))
      CmdArgs.push_back("-gno-column-info");
  
    // FIXME: Move backend command line options to the module.
    // If -gline-tables-only or -gline-directives-only is the last option it wins.
    if (const Arg *A = Args.getLastArg(options::OPT_gmodules))
      if (checkDebugInfoOption(A, Args, D, TC)) {
        if (DebugInfoKind != codegenoptions::DebugLineTablesOnly &&
            DebugInfoKind != codegenoptions::DebugDirectivesOnly) {
          DebugInfoKind = codegenoptions::LimitedDebugInfo;
          CmdArgs.push_back("-dwarf-ext-refs");
          CmdArgs.push_back("-fmodule-format=obj");
        }
      }
  
    if (T.isOSBinFormatELF() && SplitDWARFInlining)
      CmdArgs.push_back("-fsplit-dwarf-inlining");
  
    // After we've dealt with all combinations of things that could
    // make DebugInfoKind be other than None or DebugLineTablesOnly,
    // figure out if we need to "upgrade" it to standalone debug info.
    // We parse these two '-f' options whether or not they will be used,
    // to claim them even if you wrote "-fstandalone-debug -gline-tables-only"
    bool NeedFullDebug = Args.hasFlag(
        options::OPT_fstandalone_debug, options::OPT_fno_standalone_debug,
        DebuggerTuning == llvm::DebuggerKind::LLDB ||
            TC.GetDefaultStandaloneDebug());
    if (const Arg *A = Args.getLastArg(options::OPT_fstandalone_debug))
      (void)checkDebugInfoOption(A, Args, D, TC);
  
    if (DebugInfoKind == codegenoptions::LimitedDebugInfo) {
      if (Args.hasFlag(options::OPT_fno_eliminate_unused_debug_types,
                       options::OPT_feliminate_unused_debug_types, false))
        DebugInfoKind = codegenoptions::UnusedTypeInfo;
      else if (NeedFullDebug)
        DebugInfoKind = codegenoptions::FullDebugInfo;
    }
  
    if (Args.hasFlag(options::OPT_gembed_source, options::OPT_gno_embed_source,
                     false)) {
      // Source embedding is a vendor extension to DWARF v5. By now we have
      // checked if a DWARF version was stated explicitly, and have otherwise
      // fallen back to the target default, so if this is still not at least 5
      // we emit an error.
      const Arg *A = Args.getLastArg(options::OPT_gembed_source);
      if (RequestedDWARFVersion < 5)
        D.Diag(diag::err_drv_argument_only_allowed_with)
            << A->getAsString(Args) << "-gdwarf-5";
      else if (EffectiveDWARFVersion < 5)
        // The toolchain has reduced allowed dwarf version, so we can't enable
        // -gembed-source.
        D.Diag(diag::warn_drv_dwarf_version_limited_by_target)
            << A->getAsString(Args) << TC.getTripleString() << 5
            << EffectiveDWARFVersion;
      else if (checkDebugInfoOption(A, Args, D, TC))
        CmdArgs.push_back("-gembed-source");
    }
  
    if (EmitCodeView) {
      CmdArgs.push_back("-gcodeview");
  
      // Emit codeview type hashes if requested.
      if (Args.hasFlag(options::OPT_gcodeview_ghash,
                       options::OPT_gno_codeview_ghash, false)) {
        CmdArgs.push_back("-gcodeview-ghash");
      }
    }
  
    // Omit inline line tables if requested.
    if (Args.hasFlag(options::OPT_gno_inline_line_tables,
                     options::OPT_ginline_line_tables, false)) {
      CmdArgs.push_back("-gno-inline-line-tables");
    }
  
    // When emitting remarks, we need at least debug lines in the output.
    if (willEmitRemarks(Args) &&
        DebugInfoKind <= codegenoptions::DebugDirectivesOnly)
      DebugInfoKind = codegenoptions::DebugLineTablesOnly;
  
    // Adjust the debug info kind for the given toolchain.
    TC.adjustDebugInfoKind(DebugInfoKind, Args);
  
    RenderDebugEnablingArgs(Args, CmdArgs, DebugInfoKind, EffectiveDWARFVersion,
                            DebuggerTuning);
  
    // -fdebug-macro turns on macro debug info generation.
    if (Args.hasFlag(options::OPT_fdebug_macro, options::OPT_fno_debug_macro,
                     false))
      if (checkDebugInfoOption(Args.getLastArg(options::OPT_fdebug_macro), Args,
                               D, TC))
        CmdArgs.push_back("-debug-info-macro");
  
    // -ggnu-pubnames turns on gnu style pubnames in the backend.
    const auto *PubnamesArg =
        Args.getLastArg(options::OPT_ggnu_pubnames, options::OPT_gno_gnu_pubnames,
                        options::OPT_gpubnames, options::OPT_gno_pubnames);
    if (DwarfFission != DwarfFissionKind::None ||
        (PubnamesArg && checkDebugInfoOption(PubnamesArg, Args, D, TC)))
      if (!PubnamesArg ||
          (!PubnamesArg->getOption().matches(options::OPT_gno_gnu_pubnames) &&
           !PubnamesArg->getOption().matches(options::OPT_gno_pubnames)))
        CmdArgs.push_back(PubnamesArg && PubnamesArg->getOption().matches(
                                             options::OPT_gpubnames)
                              ? "-gpubnames"
                              : "-ggnu-pubnames");
  
    if (Args.hasFlag(options::OPT_fdebug_ranges_base_address,
                     options::OPT_fno_debug_ranges_base_address, false)) {
      CmdArgs.push_back("-fdebug-ranges-base-address");
    }
  
    // -gdwarf-aranges turns on the emission of the aranges section in the
    // backend.
    // Always enabled for SCE tuning.
    bool NeedAranges = DebuggerTuning == llvm::DebuggerKind::SCE;
    if (const Arg *A = Args.getLastArg(options::OPT_gdwarf_aranges))
      NeedAranges = checkDebugInfoOption(A, Args, D, TC) || NeedAranges;
    if (NeedAranges) {
      CmdArgs.push_back("-mllvm");
      CmdArgs.push_back("-generate-arange-section");
    }
  
    if (Args.hasFlag(options::OPT_fforce_dwarf_frame,
                     options::OPT_fno_force_dwarf_frame, false))
      CmdArgs.push_back("-fforce-dwarf-frame");
  
    if (Args.hasFlag(options::OPT_fdebug_types_section,
                     options::OPT_fno_debug_types_section, false)) {
      if (!(T.isOSBinFormatELF() || T.isOSBinFormatWasm())) {
        D.Diag(diag::err_drv_unsupported_opt_for_target)
            << Args.getLastArg(options::OPT_fdebug_types_section)
                   ->getAsString(Args)
            << T.getTriple();
      } else if (checkDebugInfoOption(
                     Args.getLastArg(options::OPT_fdebug_types_section), Args, D,
                     TC)) {
        CmdArgs.push_back("-mllvm");
        CmdArgs.push_back("-generate-type-units");
      }
    }
  
    // Decide how to render forward declarations of template instantiations.
    // SCE wants full descriptions, others just get them in the name.
    if (DebuggerTuning == llvm::DebuggerKind::SCE)
      CmdArgs.push_back("-debug-forward-template-params");
  
    // Do we need to explicitly import anonymous namespaces into the parent
    // scope?
    if (DebuggerTuning == llvm::DebuggerKind::SCE)
      CmdArgs.push_back("-dwarf-explicit-import");
  
    renderDwarfFormat(D, T, Args, CmdArgs, EffectiveDWARFVersion);
    RenderDebugInfoCompressionArgs(Args, CmdArgs, D, TC);
  }
  
  void Clang::ConstructJob(Compilation &C, const JobAction &JA,
                           const InputInfo &Output, const InputInfoList &Inputs,
                           const ArgList &Args, const char *LinkingOutput) const {
    const auto &TC = getToolChain();
    const llvm::Triple &RawTriple = TC.getTriple();
    const llvm::Triple &Triple = TC.getEffectiveTriple();
    const std::string &TripleStr = Triple.getTriple();
  
    bool KernelOrKext =
        Args.hasArg(options::OPT_mkernel, options::OPT_fapple_kext);
    const Driver &D = TC.getDriver();
    ArgStringList CmdArgs;
  
    // Check number of inputs for sanity. We need at least one input.
    assert(Inputs.size() >= 1 && "Must have at least one input.");
    // CUDA/HIP compilation may have multiple inputs (source file + results of
    // device-side compilations). OpenMP device jobs also take the host IR as a
    // second input. Module precompilation accepts a list of header files to
    // include as part of the module. All other jobs are expected to have exactly
    // one input.
    bool IsCuda = JA.isOffloading(Action::OFK_Cuda);
    bool IsCudaDevice = JA.isDeviceOffloading(Action::OFK_Cuda);
    bool IsHIP = JA.isOffloading(Action::OFK_HIP);
    bool IsHIPDevice = JA.isDeviceOffloading(Action::OFK_HIP);
    bool IsOpenMPDevice = JA.isDeviceOffloading(Action::OFK_OpenMP);
    bool IsHeaderModulePrecompile = isa<HeaderModulePrecompileJobAction>(JA);
    bool IsDeviceOffloadAction = !(JA.isDeviceOffloading(Action::OFK_None) ||
                                   JA.isDeviceOffloading(Action::OFK_Host));
    bool IsUsingLTO = D.isUsingLTO(IsDeviceOffloadAction);
    auto LTOMode = D.getLTOMode(IsDeviceOffloadAction);
  
    // A header module compilation doesn't have a main input file, so invent a
    // fake one as a placeholder.
    const char *ModuleName = [&]{
      auto *ModuleNameArg = Args.getLastArg(options::OPT_fmodule_name_EQ);
      return ModuleNameArg ? ModuleNameArg->getValue() : "";
    }();
    InputInfo HeaderModuleInput(Inputs[0].getType(), ModuleName, ModuleName);
  
    const InputInfo &Input =
        IsHeaderModulePrecompile ? HeaderModuleInput : Inputs[0];
  
    InputInfoList ModuleHeaderInputs;
    const InputInfo *CudaDeviceInput = nullptr;
    const InputInfo *OpenMPDeviceInput = nullptr;
    for (const InputInfo &I : Inputs) {
      if (&I == &Input) {
        // This is the primary input.
      } else if (IsHeaderModulePrecompile &&
                 types::getPrecompiledType(I.getType()) == types::TY_PCH) {
        types::ID Expected = HeaderModuleInput.getType();
        if (I.getType() != Expected) {
          D.Diag(diag::err_drv_module_header_wrong_kind)
              << I.getFilename() << types::getTypeName(I.getType())
              << types::getTypeName(Expected);
        }
        ModuleHeaderInputs.push_back(I);
      } else if ((IsCuda || IsHIP) && !CudaDeviceInput) {
        CudaDeviceInput = &I;
      } else if (IsOpenMPDevice && !OpenMPDeviceInput) {
        OpenMPDeviceInput = &I;
      } else {
        llvm_unreachable("unexpectedly given multiple inputs");
      }
    }
  
    const llvm::Triple *AuxTriple =
        (IsCuda || IsHIP) ? TC.getAuxTriple() : nullptr;
    bool IsWindowsMSVC = RawTriple.isWindowsMSVCEnvironment();
    bool IsIAMCU = RawTriple.isOSIAMCU();
  
    // Adjust IsWindowsXYZ for CUDA/HIP compilations.  Even when compiling in
    // device mode (i.e., getToolchain().getTriple() is NVPTX/AMDGCN, not
    // Windows), we need to pass Windows-specific flags to cc1.
    if (IsCuda || IsHIP)
      IsWindowsMSVC |= AuxTriple && AuxTriple->isWindowsMSVCEnvironment();
  
    // C++ is not supported for IAMCU.
    if (IsIAMCU && types::isCXX(Input.getType()))
      D.Diag(diag::err_drv_clang_unsupported) << "C++ for IAMCU";
  
    // Invoke ourselves in -cc1 mode.
    //
    // FIXME: Implement custom jobs for internal actions.
    CmdArgs.push_back("-cc1");
  
    // Add the "effective" target triple.
    CmdArgs.push_back("-triple");
    CmdArgs.push_back(Args.MakeArgString(TripleStr));
  
    if (const Arg *MJ = Args.getLastArg(options::OPT_MJ)) {
      DumpCompilationDatabase(C, MJ->getValue(), TripleStr, Output, Input, Args);
      Args.ClaimAllArgs(options::OPT_MJ);
    } else if (const Arg *GenCDBFragment =
                   Args.getLastArg(options::OPT_gen_cdb_fragment_path)) {
      DumpCompilationDatabaseFragmentToDir(GenCDBFragment->getValue(), C,
                                           TripleStr, Output, Input, Args);
      Args.ClaimAllArgs(options::OPT_gen_cdb_fragment_path);
    }
  
    if (IsCuda || IsHIP) {
      // We have to pass the triple of the host if compiling for a CUDA/HIP device
      // and vice-versa.
      std::string NormalizedTriple;
      if (JA.isDeviceOffloading(Action::OFK_Cuda) ||
          JA.isDeviceOffloading(Action::OFK_HIP))
        NormalizedTriple = C.getSingleOffloadToolChain<Action::OFK_Host>()
                               ->getTriple()
                               .normalize();
      else {
        // Host-side compilation.
        NormalizedTriple =
            (IsCuda ? C.getSingleOffloadToolChain<Action::OFK_Cuda>()
                    : C.getSingleOffloadToolChain<Action::OFK_HIP>())
                ->getTriple()
                .normalize();
        if (IsCuda) {
          // We need to figure out which CUDA version we're compiling for, as that
          // determines how we load and launch GPU kernels.
          auto *CTC = static_cast<const toolchains::CudaToolChain *>(
              C.getSingleOffloadToolChain<Action::OFK_Cuda>());
          assert(CTC && "Expected valid CUDA Toolchain.");
          if (CTC && CTC->CudaInstallation.version() != CudaVersion::UNKNOWN)
            CmdArgs.push_back(Args.MakeArgString(
                Twine("-target-sdk-version=") +
                CudaVersionToString(CTC->CudaInstallation.version())));
        }
      }
      CmdArgs.push_back("-aux-triple");
      CmdArgs.push_back(Args.MakeArgString(NormalizedTriple));
    }
  
    if (Args.hasFlag(options::OPT_fsycl, options::OPT_fno_sycl, false)) {
      CmdArgs.push_back("-fsycl-is-device");
  
      if (Arg *A = Args.getLastArg(options::OPT_sycl_std_EQ)) {
        A->render(Args, CmdArgs);
      } else {
        // Ensure the default version in SYCL mode is 2020.
        CmdArgs.push_back("-sycl-std=2020");
      }
    }
  
    if (IsOpenMPDevice) {
      // We have to pass the triple of the host if compiling for an OpenMP device.
      std::string NormalizedTriple =
          C.getSingleOffloadToolChain<Action::OFK_Host>()
              ->getTriple()
              .normalize();
      CmdArgs.push_back("-aux-triple");
      CmdArgs.push_back(Args.MakeArgString(NormalizedTriple));
    }
  
    if (Triple.isOSWindows() && (Triple.getArch() == llvm::Triple::arm ||
                                 Triple.getArch() == llvm::Triple::thumb)) {
      unsigned Offset = Triple.getArch() == llvm::Triple::arm ? 4 : 6;
      unsigned Version = 0;
      bool Failure =
          Triple.getArchName().substr(Offset).consumeInteger(10, Version);
      if (Failure || Version < 7)
        D.Diag(diag::err_target_unsupported_arch) << Triple.getArchName()
                                                  << TripleStr;
    }
  
    // Push all default warning arguments that are specific to
    // the given target.  These come before user provided warning options
    // are provided.
    TC.addClangWarningOptions(CmdArgs);
  
    // FIXME: Subclass ToolChain for SPIR and move this to addClangWarningOptions.
    if (Triple.isSPIR())
      CmdArgs.push_back("-Wspir-compat");
  
    // Select the appropriate action.
    RewriteKind rewriteKind = RK_None;
  
    // If CollectArgsForIntegratedAssembler() isn't called below, claim the args
    // it claims when not running an assembler. Otherwise, clang would emit
    // "argument unused" warnings for assembler flags when e.g. adding "-E" to
    // flags while debugging something. That'd be somewhat inconvenient, and it's
    // also inconsistent with most other flags -- we don't warn on
    // -ffunction-sections not being used in -E mode either for example, even
    // though it's not really used either.
    if (!isa<AssembleJobAction>(JA)) {
      // The args claimed here should match the args used in
      // CollectArgsForIntegratedAssembler().
      if (TC.useIntegratedAs()) {
        Args.ClaimAllArgs(options::OPT_mrelax_all);
        Args.ClaimAllArgs(options::OPT_mno_relax_all);
        Args.ClaimAllArgs(options::OPT_mincremental_linker_compatible);
        Args.ClaimAllArgs(options::OPT_mno_incremental_linker_compatible);
        switch (C.getDefaultToolChain().getArch()) {
        case llvm::Triple::arm:
        case llvm::Triple::armeb:
        case llvm::Triple::thumb:
        case llvm::Triple::thumbeb:
          Args.ClaimAllArgs(options::OPT_mimplicit_it_EQ);
          break;
        default:
          break;
        }
      }
      Args.ClaimAllArgs(options::OPT_Wa_COMMA);
      Args.ClaimAllArgs(options::OPT_Xassembler);
    }
  
    if (isa<AnalyzeJobAction>(JA)) {
      assert(JA.getType() == types::TY_Plist && "Invalid output type.");
      CmdArgs.push_back("-analyze");
    } else if (isa<MigrateJobAction>(JA)) {
      CmdArgs.push_back("-migrate");
    } else if (isa<PreprocessJobAction>(JA)) {
      if (Output.getType() == types::TY_Dependencies)
        CmdArgs.push_back("-Eonly");
      else {
        CmdArgs.push_back("-E");
        if (Args.hasArg(options::OPT_rewrite_objc) &&
            !Args.hasArg(options::OPT_g_Group))
          CmdArgs.push_back("-P");
      }
    } else if (isa<AssembleJobAction>(JA)) {
      CmdArgs.push_back("-emit-obj");
  
      CollectArgsForIntegratedAssembler(C, Args, CmdArgs, D);
  
      // Also ignore explicit -force_cpusubtype_ALL option.
      (void)Args.hasArg(options::OPT_force__cpusubtype__ALL);
    } else if (isa<PrecompileJobAction>(JA)) {
      if (JA.getType() == types::TY_Nothing)
        CmdArgs.push_back("-fsyntax-only");
      else if (JA.getType() == types::TY_ModuleFile)
        CmdArgs.push_back(IsHeaderModulePrecompile
                              ? "-emit-header-module"
                              : "-emit-module-interface");
      else
        CmdArgs.push_back("-emit-pch");
    } else if (isa<VerifyPCHJobAction>(JA)) {
      CmdArgs.push_back("-verify-pch");
    } else {
      assert((isa<CompileJobAction>(JA) || isa<BackendJobAction>(JA)) &&
             "Invalid action for clang tool.");
      if (JA.getType() == types::TY_Nothing) {
        CmdArgs.push_back("-fsyntax-only");
      } else if (JA.getType() == types::TY_LLVM_IR ||
                 JA.getType() == types::TY_LTO_IR) {
        CmdArgs.push_back("-emit-llvm");
      } else if (JA.getType() == types::TY_LLVM_BC ||
                 JA.getType() == types::TY_LTO_BC) {
        // Emit textual llvm IR for AMDGPU offloading for -emit-llvm -S
        if (Triple.isAMDGCN() && IsOpenMPDevice && Args.hasArg(options::OPT_S) &&
            Args.hasArg(options::OPT_emit_llvm)) {
          CmdArgs.push_back("-emit-llvm");
        } else {
          CmdArgs.push_back("-emit-llvm-bc");
        }
      } else if (JA.getType() == types::TY_IFS ||
                 JA.getType() == types::TY_IFS_CPP) {
        StringRef ArgStr =
            Args.hasArg(options::OPT_interface_stub_version_EQ)
                ? Args.getLastArgValue(options::OPT_interface_stub_version_EQ)
                : "experimental-ifs-v2";
        CmdArgs.push_back("-emit-interface-stubs");
        CmdArgs.push_back(
            Args.MakeArgString(Twine("-interface-stub-version=") + ArgStr.str()));
      } else if (JA.getType() == types::TY_PP_Asm) {
        CmdArgs.push_back("-S");
      } else if (JA.getType() == types::TY_AST) {
        CmdArgs.push_back("-emit-pch");
      } else if (JA.getType() == types::TY_ModuleFile) {
        CmdArgs.push_back("-module-file-info");
      } else if (JA.getType() == types::TY_RewrittenObjC) {
        CmdArgs.push_back("-rewrite-objc");
        rewriteKind = RK_NonFragile;
      } else if (JA.getType() == types::TY_RewrittenLegacyObjC) {
        CmdArgs.push_back("-rewrite-objc");
        rewriteKind = RK_Fragile;
      } else {
        assert(JA.getType() == types::TY_PP_Asm && "Unexpected output type!");
      }
  
      // Preserve use-list order by default when emitting bitcode, so that
      // loading the bitcode up in 'opt' or 'llc' and running passes gives the
      // same result as running passes here.  For LTO, we don't need to preserve
      // the use-list order, since serialization to bitcode is part of the flow.
      if (JA.getType() == types::TY_LLVM_BC)
        CmdArgs.push_back("-emit-llvm-uselists");
  
      if (IsUsingLTO) {
        if (!IsDeviceOffloadAction) {
          if (Args.hasArg(options::OPT_flto))
            CmdArgs.push_back("-flto");
          else {
            if (D.getLTOMode() == LTOK_Thin)
              CmdArgs.push_back("-flto=thin");
            else
              CmdArgs.push_back("-flto=full");
          }
          CmdArgs.push_back("-flto-unit");
        } else if (Triple.isAMDGPU()) {
          // Only AMDGPU supports device-side LTO
          assert(LTOMode == LTOK_Full || LTOMode == LTOK_Thin);
          CmdArgs.push_back(Args.MakeArgString(
              Twine("-flto=") + (LTOMode == LTOK_Thin ? "thin" : "full")));
          CmdArgs.push_back("-flto-unit");
        } else {
          D.Diag(diag::err_drv_unsupported_opt_for_target)
              << Args.getLastArg(options::OPT_foffload_lto,
                                 options::OPT_foffload_lto_EQ)
                     ->getAsString(Args)
              << Triple.getTriple();
        }
      }
    }
  
    if (const Arg *A = Args.getLastArg(options::OPT_fthinlto_index_EQ)) {
      if (!types::isLLVMIR(Input.getType()))
        D.Diag(diag::err_drv_arg_requires_bitcode_input) << A->getAsString(Args);
      Args.AddLastArg(CmdArgs, options::OPT_fthinlto_index_EQ);
    }
  
    if (Args.getLastArg(options::OPT_fthin_link_bitcode_EQ))
      Args.AddLastArg(CmdArgs, options::OPT_fthin_link_bitcode_EQ);
  
    if (Args.getLastArg(options::OPT_save_temps_EQ))
      Args.AddLastArg(CmdArgs, options::OPT_save_temps_EQ);
  
    auto *MemProfArg = Args.getLastArg(options::OPT_fmemory_profile,
                                       options::OPT_fmemory_profile_EQ,
                                       options::OPT_fno_memory_profile);
    if (MemProfArg &&
        !MemProfArg->getOption().matches(options::OPT_fno_memory_profile))
      MemProfArg->render(Args, CmdArgs);
  
    // Embed-bitcode option.
    // Only white-listed flags below are allowed to be embedded.
    if (C.getDriver().embedBitcodeInObject() && !IsUsingLTO &&
        (isa<BackendJobAction>(JA) || isa<AssembleJobAction>(JA))) {
      // Add flags implied by -fembed-bitcode.
      Args.AddLastArg(CmdArgs, options::OPT_fembed_bitcode_EQ);
      // Disable all llvm IR level optimizations.
      CmdArgs.push_back("-disable-llvm-passes");
  
      // Render target options.
      TC.addClangTargetOptions(Args, CmdArgs, JA.getOffloadingDeviceKind());
  
      // reject options that shouldn't be supported in bitcode
      // also reject kernel/kext
      static const constexpr unsigned kBitcodeOptionBlacklist[] = {
          options::OPT_mkernel,
          options::OPT_fapple_kext,
          options::OPT_ffunction_sections,
          options::OPT_fno_function_sections,
          options::OPT_fdata_sections,
          options::OPT_fno_data_sections,
          options::OPT_fbasic_block_sections_EQ,
          options::OPT_funique_internal_linkage_names,
          options::OPT_fno_unique_internal_linkage_names,
          options::OPT_funique_section_names,
          options::OPT_fno_unique_section_names,
          options::OPT_funique_basic_block_section_names,
          options::OPT_fno_unique_basic_block_section_names,
          options::OPT_mrestrict_it,
          options::OPT_mno_restrict_it,
          options::OPT_mstackrealign,
          options::OPT_mno_stackrealign,
          options::OPT_mstack_alignment,
          options::OPT_mcmodel_EQ,
          options::OPT_mlong_calls,
          options::OPT_mno_long_calls,
          options::OPT_ggnu_pubnames,
          options::OPT_gdwarf_aranges,
          options::OPT_fdebug_types_section,
          options::OPT_fno_debug_types_section,
          options::OPT_fdwarf_directory_asm,
          options::OPT_fno_dwarf_directory_asm,
          options::OPT_mrelax_all,
          options::OPT_mno_relax_all,
          options::OPT_ftrap_function_EQ,
          options::OPT_ffixed_r9,
          options::OPT_mfix_cortex_a53_835769,
          options::OPT_mno_fix_cortex_a53_835769,
          options::OPT_ffixed_x18,
          options::OPT_mglobal_merge,
          options::OPT_mno_global_merge,
          options::OPT_mred_zone,
          options::OPT_mno_red_zone,
          options::OPT_Wa_COMMA,
          options::OPT_Xassembler,
          options::OPT_mllvm,
      };
      for (const auto &A : Args)
        if (llvm::find(kBitcodeOptionBlacklist, A->getOption().getID()) !=
            std::end(kBitcodeOptionBlacklist))
          D.Diag(diag::err_drv_unsupported_embed_bitcode) << A->getSpelling();
  
      // Render the CodeGen options that need to be passed.
      if (!Args.hasFlag(options::OPT_foptimize_sibling_calls,
                        options::OPT_fno_optimize_sibling_calls))
        CmdArgs.push_back("-mdisable-tail-calls");
  
      RenderFloatingPointOptions(TC, D, isOptimizationLevelFast(Args), Args,
                                 CmdArgs, JA);
  
      // Render ABI arguments
      switch (TC.getArch()) {
      default: break;
      case llvm::Triple::arm:
      case llvm::Triple::armeb:
      case llvm::Triple::thumbeb:
        RenderARMABI(Triple, Args, CmdArgs);
        break;
      case llvm::Triple::aarch64:
      case llvm::Triple::aarch64_32:
      case llvm::Triple::aarch64_be:
        RenderAArch64ABI(Triple, Args, CmdArgs);
        break;
      }
  
      // Optimization level for CodeGen.
      if (const Arg *A = Args.getLastArg(options::OPT_O_Group)) {
        if (A->getOption().matches(options::OPT_O4)) {
          CmdArgs.push_back("-O3");
          D.Diag(diag::warn_O4_is_O3);
        } else {
          A->render(Args, CmdArgs);
        }
      }
  
      // Input/Output file.
      if (Output.getType() == types::TY_Dependencies) {
        // Handled with other dependency code.
      } else if (Output.isFilename()) {
        CmdArgs.push_back("-o");
        CmdArgs.push_back(Output.getFilename());
      } else {
        assert(Output.isNothing() && "Input output.");
      }
  
      for (const auto &II : Inputs) {
        addDashXForInput(Args, II, CmdArgs);
        if (II.isFilename())
          CmdArgs.push_back(II.getFilename());
        else
          II.getInputArg().renderAsInput(Args, CmdArgs);
      }
  
      C.addCommand(std::make_unique<Command>(
          JA, *this, ResponseFileSupport::AtFileUTF8(), D.getClangProgramPath(),
          CmdArgs, Inputs, Output));
      return;
    }
  
    if (C.getDriver().embedBitcodeMarkerOnly() && !IsUsingLTO)
      CmdArgs.push_back("-fembed-bitcode=marker");
  
    // We normally speed up the clang process a bit by skipping destructors at
    // exit, but when we're generating diagnostics we can rely on some of the
    // cleanup.
    if (!C.isForDiagnostics())
      CmdArgs.push_back("-disable-free");
  
  #ifdef NDEBUG
    const bool IsAssertBuild = false;
  #else
    const bool IsAssertBuild = true;
  #endif
  
    // Disable the verification pass in -asserts builds.
    if (!IsAssertBuild)
      CmdArgs.push_back("-disable-llvm-verifier");
  
    // Discard value names in assert builds unless otherwise specified.
    if (Args.hasFlag(options::OPT_fdiscard_value_names,
                     options::OPT_fno_discard_value_names, !IsAssertBuild)) {
      if (Args.hasArg(options::OPT_fdiscard_value_names) &&
          (std::any_of(Inputs.begin(), Inputs.end(),
                       [](const clang::driver::InputInfo &II) {
                         return types::isLLVMIR(II.getType());
                       }))) {
        D.Diag(diag::warn_ignoring_fdiscard_for_bitcode);
      }
      CmdArgs.push_back("-discard-value-names");
    }
  
    // Set the main file name, so that debug info works even with
    // -save-temps.
    CmdArgs.push_back("-main-file-name");
    CmdArgs.push_back(getBaseInputName(Args, Input));
  
    // Some flags which affect the language (via preprocessor
    // defines).
    if (Args.hasArg(options::OPT_static))
      CmdArgs.push_back("-static-define");
  
    if (Args.hasArg(options::OPT_municode))
      CmdArgs.push_back("-DUNICODE");
  
    if (isa<AnalyzeJobAction>(JA))
      RenderAnalyzerOptions(Args, CmdArgs, Triple, Input);
  
    if (isa<AnalyzeJobAction>(JA) ||
        (isa<PreprocessJobAction>(JA) && Args.hasArg(options::OPT__analyze)))
      CmdArgs.push_back("-setup-static-analyzer");
  
    // Enable compatilibily mode to avoid analyzer-config related errors.
    // Since we can't access frontend flags through hasArg, let's manually iterate
    // through them.
    bool FoundAnalyzerConfig = false;
    for (auto Arg : Args.filtered(options::OPT_Xclang))
      if (StringRef(Arg->getValue()) == "-analyzer-config") {
        FoundAnalyzerConfig = true;
        break;
      }
    if (!FoundAnalyzerConfig)
      for (auto Arg : Args.filtered(options::OPT_Xanalyzer))
        if (StringRef(Arg->getValue()) == "-analyzer-config") {
          FoundAnalyzerConfig = true;
          break;
        }
    if (FoundAnalyzerConfig)
      CmdArgs.push_back("-analyzer-config-compatibility-mode=true");
  
    CheckCodeGenerationOptions(D, Args);
  
    unsigned FunctionAlignment = ParseFunctionAlignment(TC, Args);
    assert(FunctionAlignment <= 31 && "function alignment will be truncated!");
    if (FunctionAlignment) {
      CmdArgs.push_back("-function-alignment");
      CmdArgs.push_back(Args.MakeArgString(std::to_string(FunctionAlignment)));
    }
  
    llvm::Reloc::Model RelocationModel;
    unsigned PICLevel;
    bool IsPIE;
    std::tie(RelocationModel, PICLevel, IsPIE) = ParsePICArgs(TC, Args);
  
    bool IsROPI = RelocationModel == llvm::Reloc::ROPI ||
                  RelocationModel == llvm::Reloc::ROPI_RWPI;
    bool IsRWPI = RelocationModel == llvm::Reloc::RWPI ||
                  RelocationModel == llvm::Reloc::ROPI_RWPI;
  
    if (Args.hasArg(options::OPT_mcmse) &&
        !Args.hasArg(options::OPT_fallow_unsupported)) {
      if (IsROPI)
        D.Diag(diag::err_cmse_pi_are_incompatible) << IsROPI;
      if (IsRWPI)
        D.Diag(diag::err_cmse_pi_are_incompatible) << !IsRWPI;
    }
  
    if (IsROPI && types::isCXX(Input.getType()) &&
        !Args.hasArg(options::OPT_fallow_unsupported))
      D.Diag(diag::err_drv_ropi_incompatible_with_cxx);
  
    const char *RMName = RelocationModelName(RelocationModel);
    if (RMName) {
      CmdArgs.push_back("-mrelocation-model");
      CmdArgs.push_back(RMName);
    }
    if (PICLevel > 0) {
      CmdArgs.push_back("-pic-level");
      CmdArgs.push_back(PICLevel == 1 ? "1" : "2");
      if (IsPIE)
        CmdArgs.push_back("-pic-is-pie");
    }
  
    if (RelocationModel == llvm::Reloc::ROPI ||
        RelocationModel == llvm::Reloc::ROPI_RWPI)
      CmdArgs.push_back("-fropi");
    if (RelocationModel == llvm::Reloc::RWPI ||
        RelocationModel == llvm::Reloc::ROPI_RWPI)
      CmdArgs.push_back("-frwpi");
  
    if (Arg *A = Args.getLastArg(options::OPT_meabi)) {
      CmdArgs.push_back("-meabi");
      CmdArgs.push_back(A->getValue());
    }
  
    // -fsemantic-interposition is forwarded to CC1: set the
    // "SemanticInterposition" metadata to 1 (make some linkages interposable) and
    // make default visibility external linkage definitions dso_preemptable.
    //
    // -fno-semantic-interposition: if the target supports .Lfoo$local local
    // aliases (make default visibility external linkage definitions dso_local).
    // This is the CC1 default for ELF to match COFF/Mach-O.
    //
    // Otherwise use Clang's traditional behavior: like
    // -fno-semantic-interposition but local aliases are not used. So references
    // can be interposed if not optimized out.
    if (Triple.isOSBinFormatELF()) {
      Arg *A = Args.getLastArg(options::OPT_fsemantic_interposition,
                               options::OPT_fno_semantic_interposition);
      if (RelocationModel != llvm::Reloc::Static && !IsPIE) {
        // The supported targets need to call AsmPrinter::getSymbolPreferLocal.
        bool SupportsLocalAlias =
            Triple.isAArch64() || Triple.isRISCV() || Triple.isX86();
        if (!A)
          CmdArgs.push_back("-fhalf-no-semantic-interposition");
        else if (A->getOption().matches(options::OPT_fsemantic_interposition))
          A->render(Args, CmdArgs);
        else if (!SupportsLocalAlias)
          CmdArgs.push_back("-fhalf-no-semantic-interposition");
      }
    }
  
    {
      std::string Model;
      if (Arg *A = Args.getLastArg(options::OPT_mthread_model)) {
        if (!TC.isThreadModelSupported(A->getValue()))
          D.Diag(diag::err_drv_invalid_thread_model_for_target)
              << A->getValue() << A->getAsString(Args);
        Model = A->getValue();
      } else
        Model = TC.getThreadModel();
      if (Model != "posix") {
        CmdArgs.push_back("-mthread-model");
        CmdArgs.push_back(Args.MakeArgString(Model));
      }
    }
  
    Args.AddLastArg(CmdArgs, options::OPT_fveclib);
  
    if (Args.hasFlag(options::OPT_fmerge_all_constants,
                     options::OPT_fno_merge_all_constants, false))
      CmdArgs.push_back("-fmerge-all-constants");
  
    if (Args.hasFlag(options::OPT_fno_delete_null_pointer_checks,
                     options::OPT_fdelete_null_pointer_checks, false))
      CmdArgs.push_back("-fno-delete-null-pointer-checks");
  
    // LLVM Code Generator Options.
  
    for (const Arg *A : Args.filtered(options::OPT_frewrite_map_file_EQ)) {
      StringRef Map = A->getValue();
      if (!llvm::sys::fs::exists(Map)) {
        D.Diag(diag::err_drv_no_such_file) << Map;
      } else {
        A->render(Args, CmdArgs);
        A->claim();
      }
    }
  
    if (Arg *A = Args.getLastArg(options::OPT_mabi_EQ_vec_extabi,
                                 options::OPT_mabi_EQ_vec_default)) {
      if (!Triple.isOSAIX())
        D.Diag(diag::err_drv_unsupported_opt_for_target)
            << A->getSpelling() << RawTriple.str();
      if (A->getOption().getID() == options::OPT_mabi_EQ_vec_extabi)
        CmdArgs.push_back("-mabi=vec-extabi");
      else
        CmdArgs.push_back("-mabi=vec-default");
    }
  
    if (Arg *A = Args.getLastArg(options::OPT_Wframe_larger_than_EQ)) {
      StringRef v = A->getValue();
      // FIXME: Validate the argument here so we don't produce meaningless errors
      // about -fwarn-stack-size=.
      if (v.empty())
        D.Diag(diag::err_drv_missing_argument) << A->getSpelling() << 1;
      else
        CmdArgs.push_back(Args.MakeArgString("-fwarn-stack-size=" + v));
      A->claim();
    }
  
    if (!Args.hasFlag(options::OPT_fjump_tables, options::OPT_fno_jump_tables,
                      true))
      CmdArgs.push_back("-fno-jump-tables");
  
    if (Args.hasFlag(options::OPT_fprofile_sample_accurate,
                     options::OPT_fno_profile_sample_accurate, false))
      CmdArgs.push_back("-fprofile-sample-accurate");
  
    if (!Args.hasFlag(options::OPT_fpreserve_as_comments,
                      options::OPT_fno_preserve_as_comments, true))
      CmdArgs.push_back("-fno-preserve-as-comments");
  
    if (Arg *A = Args.getLastArg(options::OPT_mregparm_EQ)) {
      CmdArgs.push_back("-mregparm");
      CmdArgs.push_back(A->getValue());
    }
  
    if (Arg *A = Args.getLastArg(options::OPT_maix_struct_return,
                                 options::OPT_msvr4_struct_return)) {
      if (!TC.getTriple().isPPC32()) {
        D.Diag(diag::err_drv_unsupported_opt_for_target)
            << A->getSpelling() << RawTriple.str();
      } else if (A->getOption().matches(options::OPT_maix_struct_return)) {
        CmdArgs.push_back("-maix-struct-return");
      } else {
        assert(A->getOption().matches(options::OPT_msvr4_struct_return));
        CmdArgs.push_back("-msvr4-struct-return");
      }
    }
  
    if (Arg *A = Args.getLastArg(options::OPT_fpcc_struct_return,
                                 options::OPT_freg_struct_return)) {
      if (TC.getArch() != llvm::Triple::x86) {
        D.Diag(diag::err_drv_unsupported_opt_for_target)
            << A->getSpelling() << RawTriple.str();
      } else if (A->getOption().matches(options::OPT_fpcc_struct_return)) {
        CmdArgs.push_back("-fpcc-struct-return");
      } else {
        assert(A->getOption().matches(options::OPT_freg_struct_return));
        CmdArgs.push_back("-freg-struct-return");
      }
    }
  
    if (Args.hasFlag(options::OPT_mrtd, options::OPT_mno_rtd, false))
      CmdArgs.push_back("-fdefault-calling-conv=stdcall");
  
    if (Args.hasArg(options::OPT_fenable_matrix)) {
      // enable-matrix is needed by both the LangOpts and by LLVM.
      CmdArgs.push_back("-fenable-matrix");
      CmdArgs.push_back("-mllvm");
      CmdArgs.push_back("-enable-matrix");
    }
  
    CodeGenOptions::FramePointerKind FPKeepKind =
                    getFramePointerKind(Args, RawTriple);
    const char *FPKeepKindStr = nullptr;
    switch (FPKeepKind) {
    case CodeGenOptions::FramePointerKind::None:
      FPKeepKindStr = "-mframe-pointer=none";
      break;
    case CodeGenOptions::FramePointerKind::NonLeaf:
      FPKeepKindStr = "-mframe-pointer=non-leaf";
      break;
    case CodeGenOptions::FramePointerKind::All:
      FPKeepKindStr = "-mframe-pointer=all";
      break;
    }
    assert(FPKeepKindStr && "unknown FramePointerKind");
    CmdArgs.push_back(FPKeepKindStr);
  
    if (!Args.hasFlag(options::OPT_fzero_initialized_in_bss,
                      options::OPT_fno_zero_initialized_in_bss, true))
      CmdArgs.push_back("-fno-zero-initialized-in-bss");
  
    bool OFastEnabled = isOptimizationLevelFast(Args);
    // If -Ofast is the optimization level, then -fstrict-aliasing should be
    // enabled.  This alias option is being used to simplify the hasFlag logic.
    OptSpecifier StrictAliasingAliasOption =
        OFastEnabled ? options::OPT_Ofast : options::OPT_fstrict_aliasing;
    // We turn strict aliasing off by default if we're in CL mode, since MSVC
    // doesn't do any TBAA.
    bool TBAAOnByDefault = !D.IsCLMode();
    if (!Args.hasFlag(options::OPT_fstrict_aliasing, StrictAliasingAliasOption,
                      options::OPT_fno_strict_aliasing, TBAAOnByDefault))
      CmdArgs.push_back("-relaxed-aliasing");
    if (!Args.hasFlag(options::OPT_fstruct_path_tbaa,
                      options::OPT_fno_struct_path_tbaa))
      CmdArgs.push_back("-no-struct-path-tbaa");
    if (Args.hasFlag(options::OPT_fstrict_enums, options::OPT_fno_strict_enums,
                     false))
      CmdArgs.push_back("-fstrict-enums");
    if (!Args.hasFlag(options::OPT_fstrict_return, options::OPT_fno_strict_return,
                      true))
      CmdArgs.push_back("-fno-strict-return");
    if (Args.hasFlag(options::OPT_fallow_editor_placeholders,
                     options::OPT_fno_allow_editor_placeholders, false))
      CmdArgs.push_back("-fallow-editor-placeholders");
    if (Args.hasFlag(options::OPT_fstrict_vtable_pointers,
                     options::OPT_fno_strict_vtable_pointers,
                     false))
      CmdArgs.push_back("-fstrict-vtable-pointers");
    if (Args.hasFlag(options::OPT_fforce_emit_vtables,
                     options::OPT_fno_force_emit_vtables,
                     false))
      CmdArgs.push_back("-fforce-emit-vtables");
    if (!Args.hasFlag(options::OPT_foptimize_sibling_calls,
                      options::OPT_fno_optimize_sibling_calls))
      CmdArgs.push_back("-mdisable-tail-calls");
    if (Args.hasFlag(options::OPT_fno_escaping_block_tail_calls,
                     options::OPT_fescaping_block_tail_calls, false))
      CmdArgs.push_back("-fno-escaping-block-tail-calls");
  
    Args.AddLastArg(CmdArgs, options::OPT_ffine_grained_bitfield_accesses,
                    options::OPT_fno_fine_grained_bitfield_accesses);
  
    Args.AddLastArg(CmdArgs, options::OPT_fexperimental_relative_cxx_abi_vtables,
                    options::OPT_fno_experimental_relative_cxx_abi_vtables);
  
    // Handle segmented stacks.
    if (Args.hasFlag(options::OPT_fsplit_stack, options::OPT_fno_split_stack,
                     false))
      CmdArgs.push_back("-fsplit-stack");
  
    // -fprotect-parens=0 is default.
    if (Args.hasFlag(options::OPT_fprotect_parens,
                     options::OPT_fno_protect_parens, false))
      CmdArgs.push_back("-fprotect-parens");
  
    RenderFloatingPointOptions(TC, D, OFastEnabled, Args, CmdArgs, JA);
  
    if (Arg *A = Args.getLastArg(options::OPT_fextend_args_EQ)) {
      const llvm::Triple::ArchType Arch = TC.getArch();
      if (Arch == llvm::Triple::x86 || Arch == llvm::Triple::x86_64) {
        StringRef V = A->getValue();
        if (V == "64")
          CmdArgs.push_back("-fextend-arguments=64");
        else if (V != "32")
          D.Diag(diag::err_drv_invalid_argument_to_option)
              << A->getValue() << A->getOption().getName();
      } else
        D.Diag(diag::err_drv_unsupported_opt_for_target)
            << A->getOption().getName() << TripleStr;
    }
  
    if (Arg *A = Args.getLastArg(options::OPT_mdouble_EQ)) {
      if (TC.getArch() == llvm::Triple::avr)
        A->render(Args, CmdArgs);
      else
        D.Diag(diag::err_drv_unsupported_opt_for_target)
            << A->getAsString(Args) << TripleStr;
    }
  
    if (Arg *A = Args.getLastArg(options::OPT_LongDouble_Group)) {
      if (TC.getTriple().isX86())
        A->render(Args, CmdArgs);
      else if (TC.getTriple().isPPC() &&
               (A->getOption().getID() != options::OPT_mlong_double_80))
        A->render(Args, CmdArgs);
      else
        D.Diag(diag::err_drv_unsupported_opt_for_target)
            << A->getAsString(Args) << TripleStr;
    }
  
    // Decide whether to use verbose asm. Verbose assembly is the default on
    // toolchains which have the integrated assembler on by default.
    bool IsIntegratedAssemblerDefault = TC.IsIntegratedAssemblerDefault();
    if (!Args.hasFlag(options::OPT_fverbose_asm, options::OPT_fno_verbose_asm,
                      IsIntegratedAssemblerDefault))
      CmdArgs.push_back("-fno-verbose-asm");
  
    // Parse 'none' or '$major.$minor'. Disallow -fbinutils-version=0 because we
    // use that to indicate the MC default in the backend.
    if (Arg *A = Args.getLastArg(options::OPT_fbinutils_version_EQ)) {
      StringRef V = A->getValue();
      unsigned Num;
      if (V == "none")
        A->render(Args, CmdArgs);
      else if (!V.consumeInteger(10, Num) && Num > 0 &&
               (V.empty() || (V.consume_front(".") &&
                              !V.consumeInteger(10, Num) && V.empty())))
        A->render(Args, CmdArgs);
      else
        D.Diag(diag::err_drv_invalid_argument_to_option)
            << A->getValue() << A->getOption().getName();
    }
  
    if (!TC.useIntegratedAs())
      CmdArgs.push_back("-no-integrated-as");
  
    if (Args.hasArg(options::OPT_fdebug_pass_structure)) {
      CmdArgs.push_back("-mdebug-pass");
      CmdArgs.push_back("Structure");
    }
    if (Args.hasArg(options::OPT_fdebug_pass_arguments)) {
      CmdArgs.push_back("-mdebug-pass");
      CmdArgs.push_back("Arguments");
    }
  
    // Enable -mconstructor-aliases except on darwin, where we have to work around
    // a linker bug (see <rdar://problem/7651567>), and CUDA/AMDGPU device code,
    // where aliases aren't supported.
    if (!RawTriple.isOSDarwin() && !RawTriple.isNVPTX() && !RawTriple.isAMDGPU())
      CmdArgs.push_back("-mconstructor-aliases");
  
    // Darwin's kernel doesn't support guard variables; just die if we
    // try to use them.
    if (KernelOrKext && RawTriple.isOSDarwin())
      CmdArgs.push_back("-fforbid-guard-variables");
  
    if (Args.hasFlag(options::OPT_mms_bitfields, options::OPT_mno_ms_bitfields,
                     Triple.isWindowsGNUEnvironment())) {
      CmdArgs.push_back("-mms-bitfields");
    }
  
    // Non-PIC code defaults to -fdirect-access-external-data while PIC code
    // defaults to -fno-direct-access-external-data. Pass the option if different
    // from the default.
    if (Arg *A = Args.getLastArg(options::OPT_fdirect_access_external_data,
                                 options::OPT_fno_direct_access_external_data))
      if (A->getOption().matches(options::OPT_fdirect_access_external_data) !=
          (PICLevel == 0))
        A->render(Args, CmdArgs);
  
    if (Args.hasFlag(options::OPT_fno_plt, options::OPT_fplt, false)) {
      CmdArgs.push_back("-fno-plt");
    }
  
    // -fhosted is default.
    // TODO: Audit uses of KernelOrKext and see where it'd be more appropriate to
    // use Freestanding.
    bool Freestanding =
        Args.hasFlag(options::OPT_ffreestanding, options::OPT_fhosted, false) ||
        KernelOrKext;
    if (Freestanding)
      CmdArgs.push_back("-ffreestanding");
  
    // This is a coarse approximation of what llvm-gcc actually does, both
    // -fasynchronous-unwind-tables and -fnon-call-exceptions interact in more
    // complicated ways.
    bool UnwindTables =
        Args.hasFlag(options::OPT_fasynchronous_unwind_tables,
                     options::OPT_fno_asynchronous_unwind_tables,
                     (TC.IsUnwindTablesDefault(Args) ||
                      TC.getSanitizerArgs().needsUnwindTables()) &&
                         !Freestanding);
    UnwindTables = Args.hasFlag(options::OPT_funwind_tables,
                                options::OPT_fno_unwind_tables, UnwindTables);
    if (UnwindTables)
      CmdArgs.push_back("-munwind-tables");
  
    // Prepare `-aux-target-cpu` and `-aux-target-feature` unless
    // `--gpu-use-aux-triple-only` is specified.
    if (!Args.getLastArg(options::OPT_gpu_use_aux_triple_only) &&
        (IsCudaDevice || IsHIPDevice)) {
      const ArgList &HostArgs =
          C.getArgsForToolChain(nullptr, StringRef(), Action::OFK_None);
      std::string HostCPU =
          getCPUName(HostArgs, *TC.getAuxTriple(), /*FromAs*/ false);
      if (!HostCPU.empty()) {
        CmdArgs.push_back("-aux-target-cpu");
        CmdArgs.push_back(Args.MakeArgString(HostCPU));
      }
      getTargetFeatures(D, *TC.getAuxTriple(), HostArgs, CmdArgs,
                        /*ForAS*/ false, /*IsAux*/ true);
    }
  
    TC.addClangTargetOptions(Args, CmdArgs, JA.getOffloadingDeviceKind());
  
    // FIXME: Handle -mtune=.
    (void)Args.hasArg(options::OPT_mtune_EQ);
  
    if (Arg *A = Args.getLastArg(options::OPT_mcmodel_EQ)) {
      StringRef CM = A->getValue();
      if (CM == "small" || CM == "kernel" || CM == "medium" || CM == "large" ||
          CM == "tiny")
        A->render(Args, CmdArgs);
      else
        D.Diag(diag::err_drv_invalid_argument_to_option)
            << CM << A->getOption().getName();
    }
  
    if (Arg *A = Args.getLastArg(options::OPT_mtls_size_EQ)) {
      StringRef Value = A->getValue();
      unsigned TLSSize = 0;
      Value.getAsInteger(10, TLSSize);
      if (!Triple.isAArch64() || !Triple.isOSBinFormatELF())
        D.Diag(diag::err_drv_unsupported_opt_for_target)
            << A->getOption().getName() << TripleStr;
      if (TLSSize != 12 && TLSSize != 24 && TLSSize != 32 && TLSSize != 48)
        D.Diag(diag::err_drv_invalid_int_value)
            << A->getOption().getName() << Value;
      Args.AddLastArg(CmdArgs, options::OPT_mtls_size_EQ);
    }
  
    // Add the target cpu
    std::string CPU = getCPUName(Args, Triple, /*FromAs*/ false);
    if (!CPU.empty()) {
      CmdArgs.push_back("-target-cpu");
      CmdArgs.push_back(Args.MakeArgString(CPU));
    }
  
    RenderTargetOptions(Triple, Args, KernelOrKext, CmdArgs);
  
    // FIXME: For now we want to demote any errors to warnings, when they have
    // been raised for asking the wrong question of scalable vectors, such as
    // asking for the fixed number of elements. This may happen because code that
    // is not yet ported to work for scalable vectors uses the wrong interfaces,
    // whereas the behaviour is actually correct. Emitting a warning helps bring
    // up scalable vector support in an incremental way. When scalable vector
    // support is stable enough, all uses of wrong interfaces should be considered
    // as errors, but until then, we can live with a warning being emitted by the
    // compiler. This way, Clang can be used to compile code with scalable vectors
    // and identify possible issues.
    if (isa<BackendJobAction>(JA)) {
      CmdArgs.push_back("-mllvm");
      CmdArgs.push_back("-treat-scalable-fixed-error-as-warning");
    }
  
    // These two are potentially updated by AddClangCLArgs.
    codegenoptions::DebugInfoKind DebugInfoKind = codegenoptions::NoDebugInfo;
    bool EmitCodeView = false;
  
    // Add clang-cl arguments.
    types::ID InputType = Input.getType();
    if (D.IsCLMode())
      AddClangCLArgs(Args, InputType, CmdArgs, &DebugInfoKind, &EmitCodeView);
  
    DwarfFissionKind DwarfFission = DwarfFissionKind::None;
    renderDebugOptions(TC, D, RawTriple, Args, EmitCodeView,
                       types::isLLVMIR(InputType), CmdArgs, DebugInfoKind,
                       DwarfFission);
  
    // Add the split debug info name to the command lines here so we
    // can propagate it to the backend.
    bool SplitDWARF = (DwarfFission != DwarfFissionKind::None) &&
                      (TC.getTriple().isOSBinFormatELF() ||
                       TC.getTriple().isOSBinFormatWasm()) &&
                      (isa<AssembleJobAction>(JA) || isa<CompileJobAction>(JA) ||
                       isa<BackendJobAction>(JA));
    if (SplitDWARF) {
      const char *SplitDWARFOut = SplitDebugName(JA, Args, Input, Output);
      CmdArgs.push_back("-split-dwarf-file");
      CmdArgs.push_back(SplitDWARFOut);
      if (DwarfFission == DwarfFissionKind::Split) {
        CmdArgs.push_back("-split-dwarf-output");
        CmdArgs.push_back(SplitDWARFOut);
      }
    }
  
    // Pass the linker version in use.
    if (Arg *A = Args.getLastArg(options::OPT_mlinker_version_EQ)) {
      CmdArgs.push_back("-target-linker-version");
      CmdArgs.push_back(A->getValue());
    }
  
    // Explicitly error on some things we know we don't support and can't just
    // ignore.
    if (!Args.hasArg(options::OPT_fallow_unsupported)) {
      Arg *Unsupported;
      if (types::isCXX(InputType) && RawTriple.isOSDarwin() &&
          TC.getArch() == llvm::Triple::x86) {
        if ((Unsupported = Args.getLastArg(options::OPT_fapple_kext)) ||
            (Unsupported = Args.getLastArg(options::OPT_mkernel)))
          D.Diag(diag::err_drv_clang_unsupported_opt_cxx_darwin_i386)
              << Unsupported->getOption().getName();
      }
      // The faltivec option has been superseded by the maltivec option.
      if ((Unsupported = Args.getLastArg(options::OPT_faltivec)))
        D.Diag(diag::err_drv_clang_unsupported_opt_faltivec)
            << Unsupported->getOption().getName()
            << "please use -maltivec and include altivec.h explicitly";
      if ((Unsupported = Args.getLastArg(options::OPT_fno_altivec)))
        D.Diag(diag::err_drv_clang_unsupported_opt_faltivec)
            << Unsupported->getOption().getName() << "please use -mno-altivec";
    }
  
    Args.AddAllArgs(CmdArgs, options::OPT_v);
  
    if (Args.getLastArg(options::OPT_H)) {
      CmdArgs.push_back("-H");
      CmdArgs.push_back("-sys-header-deps");
    }
    Args.AddAllArgs(CmdArgs, options::OPT_fshow_skipped_includes);
  
    if (D.CCPrintHeaders && !D.CCGenDiagnostics) {
      CmdArgs.push_back("-header-include-file");
      CmdArgs.push_back(!D.CCPrintHeadersFilename.empty()
                            ? D.CCPrintHeadersFilename.c_str()
                            : "-");
      CmdArgs.push_back("-sys-header-deps");
    }
    Args.AddLastArg(CmdArgs, options::OPT_P);
    Args.AddLastArg(CmdArgs, options::OPT_print_ivar_layout);
  
    if (D.CCLogDiagnostics && !D.CCGenDiagnostics) {
      CmdArgs.push_back("-diagnostic-log-file");
      CmdArgs.push_back(!D.CCLogDiagnosticsFilename.empty()
                            ? D.CCLogDiagnosticsFilename.c_str()
                            : "-");
    }
  
    // Give the gen diagnostics more chances to succeed, by avoiding intentional
    // crashes.
    if (D.CCGenDiagnostics)
      CmdArgs.push_back("-disable-pragma-debug-crash");
  
    // Allow backend to put its diagnostic files in the same place as frontend
    // crash diagnostics files.
    if (Args.hasArg(options::OPT_fcrash_diagnostics_dir)) {
      StringRef Dir = Args.getLastArgValue(options::OPT_fcrash_diagnostics_dir);
      CmdArgs.push_back("-mllvm");
      CmdArgs.push_back(Args.MakeArgString("-crash-diagnostics-dir=" + Dir));
    }
  
    bool UseSeparateSections = isUseSeparateSections(Triple);
  
    if (Args.hasFlag(options::OPT_ffunction_sections,
                     options::OPT_fno_function_sections, UseSeparateSections)) {
      CmdArgs.push_back("-ffunction-sections");
    }
  
    if (Arg *A = Args.getLastArg(options::OPT_fbasic_block_sections_EQ)) {
      StringRef Val = A->getValue();
      if (Triple.isX86() && Triple.isOSBinFormatELF()) {
        if (Val != "all" && Val != "labels" && Val != "none" &&
            !Val.startswith("list="))
          D.Diag(diag::err_drv_invalid_value)
              << A->getAsString(Args) << A->getValue();
        else
          A->render(Args, CmdArgs);
      } else if (Triple.isNVPTX()) {
        // Do not pass the option to the GPU compilation. We still want it enabled
        // for the host-side compilation, so seeing it here is not an error.
      } else if (Val != "none") {
        // =none is allowed everywhere. It's useful for overriding the option
        // and is the same as not specifying the option.
        D.Diag(diag::err_drv_unsupported_opt_for_target)
            << A->getAsString(Args) << TripleStr;
      }
    }
  
    bool HasDefaultDataSections = Triple.isOSBinFormatXCOFF();
    if (Args.hasFlag(options::OPT_fdata_sections, options::OPT_fno_data_sections,
                     UseSeparateSections || HasDefaultDataSections)) {
      CmdArgs.push_back("-fdata-sections");
    }
  
    if (!Args.hasFlag(options::OPT_funique_section_names,
                      options::OPT_fno_unique_section_names, true))
      CmdArgs.push_back("-fno-unique-section-names");
  
    if (Args.hasFlag(options::OPT_funique_internal_linkage_names,
                     options::OPT_fno_unique_internal_linkage_names, false))
      CmdArgs.push_back("-funique-internal-linkage-names");
  
    if (Args.hasFlag(options::OPT_funique_basic_block_section_names,
                     options::OPT_fno_unique_basic_block_section_names, false))
      CmdArgs.push_back("-funique-basic-block-section-names");
  
    if (Arg *A = Args.getLastArg(options::OPT_fsplit_machine_functions,
                                 options::OPT_fno_split_machine_functions)) {
      // This codegen pass is only available on x86-elf targets.
      if (Triple.isX86() && Triple.isOSBinFormatELF()) {
        if (A->getOption().matches(options::OPT_fsplit_machine_functions))
          A->render(Args, CmdArgs);
      } else {
        D.Diag(diag::err_drv_unsupported_opt_for_target)
            << A->getAsString(Args) << TripleStr;
      }
    }
  
    Args.AddLastArg(CmdArgs, options::OPT_finstrument_functions,
                    options::OPT_finstrument_functions_after_inlining,
                    options::OPT_finstrument_function_entry_bare);
  
    // NVPTX/AMDGCN doesn't support PGO or coverage. There's no runtime support
    // for sampling, overhead of call arc collection is way too high and there's
    // no way to collect the output.
    if (!Triple.isNVPTX() && !Triple.isAMDGCN())
      addPGOAndCoverageFlags(TC, C, D, Output, Args, CmdArgs);
  
    Args.AddLastArg(CmdArgs, options::OPT_fclang_abi_compat_EQ);
  
    // Add runtime flag for PS4 when PGO, coverage, or sanitizers are enabled.
    if (RawTriple.isPS4CPU() &&
        !Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
      PS4cpu::addProfileRTArgs(TC, Args, CmdArgs);
      PS4cpu::addSanitizerArgs(TC, CmdArgs);
    }
  
    // Pass options for controlling the default header search paths.
    if (Args.hasArg(options::OPT_nostdinc)) {
      CmdArgs.push_back("-nostdsysteminc");
      CmdArgs.push_back("-nobuiltininc");
    } else {
      if (Args.hasArg(options::OPT_nostdlibinc))
        CmdArgs.push_back("-nostdsysteminc");
      Args.AddLastArg(CmdArgs, options::OPT_nostdincxx);
      Args.AddLastArg(CmdArgs, options::OPT_nobuiltininc);
    }
  
    // Pass the path to compiler resource files.
    CmdArgs.push_back("-resource-dir");
    CmdArgs.push_back(D.ResourceDir.c_str());
  
    Args.AddLastArg(CmdArgs, options::OPT_working_directory);
  
    RenderARCMigrateToolOptions(D, Args, CmdArgs);
  
    if (Args.hasArg(options::OPT_index_store_path)) {
      Args.AddLastArg(CmdArgs, options::OPT_index_store_path);
      Args.AddLastArg(CmdArgs, options::OPT_index_ignore_system_symbols);
      Args.AddLastArg(CmdArgs, options::OPT_index_record_codegen_name);
      Args.AddLastArg(CmdArgs, options::OPT_index_unit_output_path);
      Args.AddLastArg(CmdArgs, options::OPT_index_ignore_macros);
  
      // If '-o' is passed along with '-fsyntax-only' pass it along the cc1
      // invocation so that the index action knows what the out file is.
      if (isa<CompileJobAction>(JA) && JA.getType() == types::TY_Nothing) {
        Args.AddLastArg(CmdArgs, options::OPT_o);
      }
    }
  
    if (const char *IdxStorePath = ::getenv("CLANG_PROJECT_INDEX_PATH")) {
      CmdArgs.push_back("-index-store-path");
      CmdArgs.push_back(IdxStorePath);
      CmdArgs.push_back("-index-ignore-system-symbols");
      CmdArgs.push_back("-index-record-codegen-name");
    }
  
  
    // Add preprocessing options like -I, -D, etc. if we are using the
    // preprocessor.
    //
    // FIXME: Support -fpreprocessed
    if (types::getPreprocessedType(InputType) != types::TY_INVALID)
      AddPreprocessingOptions(C, JA, D, Args, CmdArgs, Output, Inputs);
  
    // Don't warn about "clang -c -DPIC -fPIC test.i" because libtool.m4 assumes
    // that "The compiler can only warn and ignore the option if not recognized".
    // When building with ccache, it will pass -D options to clang even on
    // preprocessed inputs and configure concludes that -fPIC is not supported.
    Args.ClaimAllArgs(options::OPT_D);
  
    // Manually translate -O4 to -O3; let clang reject others.
    if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
      if (A->getOption().matches(options::OPT_O4)) {
        CmdArgs.push_back("-O3");
        D.Diag(diag::warn_O4_is_O3);
      } else {
        A->render(Args, CmdArgs);
      }
    }
  
    // Warn about ignored options to clang.
    for (const Arg *A :
         Args.filtered(options::OPT_clang_ignored_gcc_optimization_f_Group)) {
      D.Diag(diag::warn_ignored_gcc_optimization) << A->getAsString(Args);
      A->claim();
    }
  
    for (const Arg *A :
         Args.filtered(options::OPT_clang_ignored_legacy_options_Group)) {
      D.Diag(diag::warn_ignored_clang_option) << A->getAsString(Args);
      A->claim();
    }
  
    claimNoWarnArgs(Args);
  
    Args.AddAllArgs(CmdArgs, options::OPT_R_Group);
  
    Args.AddAllArgs(CmdArgs, options::OPT_W_Group);
    if (Args.hasFlag(options::OPT_pedantic, options::OPT_no_pedantic, false))
      CmdArgs.push_back("-pedantic");
    Args.AddLastArg(CmdArgs, options::OPT_pedantic_errors);
    Args.AddLastArg(CmdArgs, options::OPT_w);
  
    // Fixed point flags
    if (Args.hasFlag(options::OPT_ffixed_point, options::OPT_fno_fixed_point,
                     /*Default=*/false))
      Args.AddLastArg(CmdArgs, options::OPT_ffixed_point);
  
    if (Arg *A = Args.getLastArg(options::OPT_fcxx_abi_EQ))
      A->render(Args, CmdArgs);
  
    Args.AddLastArg(CmdArgs, options::OPT_fexperimental_relative_cxx_abi_vtables,
                    options::OPT_fno_experimental_relative_cxx_abi_vtables);
  
    // Handle -{std, ansi, trigraphs} -- take the last of -{std, ansi}
    // (-ansi is equivalent to -std=c89 or -std=c++98).
    //
    // If a std is supplied, only add -trigraphs if it follows the
    // option.
    bool ImplyVCPPCVer = false;
    bool ImplyVCPPCXXVer = false;
    const Arg *Std = Args.getLastArg(options::OPT_std_EQ, options::OPT_ansi);
    if (Std) {
      if (Std->getOption().matches(options::OPT_ansi))
        if (types::isCXX(InputType))
          CmdArgs.push_back("-std=c++98");
        else
          CmdArgs.push_back("-std=c89");
      else
        Std->render(Args, CmdArgs);
  
      // If -f(no-)trigraphs appears after the language standard flag, honor it.
      if (Arg *A = Args.getLastArg(options::OPT_std_EQ, options::OPT_ansi,
                                   options::OPT_ftrigraphs,
                                   options::OPT_fno_trigraphs))
        if (A != Std)
          A->render(Args, CmdArgs);
    } else {
      // Honor -std-default.
      //
      // FIXME: Clang doesn't correctly handle -std= when the input language
      // doesn't match. For the time being just ignore this for C++ inputs;
      // eventually we want to do all the standard defaulting here instead of
      // splitting it between the driver and clang -cc1.
      if (!types::isCXX(InputType)) {
        if (!Args.hasArg(options::OPT__SLASH_std)) {
          Args.AddAllArgsTranslated(CmdArgs, options::OPT_std_default_EQ, "-std=",
                                    /*Joined=*/true);
        } else
          ImplyVCPPCVer = true;
      }
      else if (IsWindowsMSVC)
        ImplyVCPPCXXVer = true;
  
      Args.AddLastArg(CmdArgs, options::OPT_ftrigraphs,
                      options::OPT_fno_trigraphs);
  
      // HIP headers has minimum C++ standard requirements. Therefore set the
      // default language standard.
      if (IsHIP)
        CmdArgs.push_back(IsWindowsMSVC ? "-std=c++14" : "-std=c++11");
    }
  
    // GCC's behavior for -Wwrite-strings is a bit strange:
    //  * In C, this "warning flag" changes the types of string literals from
    //    'char[N]' to 'const char[N]', and thus triggers an unrelated warning
    //    for the discarded qualifier.
    //  * In C++, this is just a normal warning flag.
    //
    // Implementing this warning correctly in C is hard, so we follow GCC's
    // behavior for now. FIXME: Directly diagnose uses of a string literal as
    // a non-const char* in C, rather than using this crude hack.
    if (!types::isCXX(InputType)) {
      // FIXME: This should behave just like a warning flag, and thus should also
      // respect -Weverything, -Wno-everything, -Werror=write-strings, and so on.
      Arg *WriteStrings =
          Args.getLastArg(options::OPT_Wwrite_strings,
                          options::OPT_Wno_write_strings, options::OPT_w);
      if (WriteStrings &&
          WriteStrings->getOption().matches(options::OPT_Wwrite_strings))
        CmdArgs.push_back("-fconst-strings");
    }
  
    // GCC provides a macro definition '__DEPRECATED' when -Wdeprecated is active
    // during C++ compilation, which it is by default. GCC keeps this define even
    // in the presence of '-w', match this behavior bug-for-bug.
    if (types::isCXX(InputType) &&
        Args.hasFlag(options::OPT_Wdeprecated, options::OPT_Wno_deprecated,
                     true)) {
      CmdArgs.push_back("-fdeprecated-macro");
    }
  
    // Translate GCC's misnamer '-fasm' arguments to '-fgnu-keywords'.
    if (Arg *Asm = Args.getLastArg(options::OPT_fasm, options::OPT_fno_asm)) {
      if (Asm->getOption().matches(options::OPT_fasm))
        CmdArgs.push_back("-fgnu-keywords");
      else
        CmdArgs.push_back("-fno-gnu-keywords");
    }
  
    if (ShouldDisableDwarfDirectory(Args, TC))
      CmdArgs.push_back("-fno-dwarf-directory-asm");
  
    if (!ShouldEnableAutolink(Args, TC, JA))
      CmdArgs.push_back("-fno-autolink");
  
    // Add in -fdebug-compilation-dir if necessary.
    addDebugCompDirArg(Args, CmdArgs, D.getVFS());
  
    addDebugPrefixMapArg(D, Args, CmdArgs);
  
    if (Arg *A = Args.getLastArg(options::OPT_ftemplate_depth_,
                                 options::OPT_ftemplate_depth_EQ)) {
      CmdArgs.push_back("-ftemplate-depth");
      CmdArgs.push_back(A->getValue());
    }
  
    if (Arg *A = Args.getLastArg(options::OPT_foperator_arrow_depth_EQ)) {
      CmdArgs.push_back("-foperator-arrow-depth");
      CmdArgs.push_back(A->getValue());
    }
  
    if (Arg *A = Args.getLastArg(options::OPT_fconstexpr_depth_EQ)) {
      CmdArgs.push_back("-fconstexpr-depth");
      CmdArgs.push_back(A->getValue());
    }
  
    if (Arg *A = Args.getLastArg(options::OPT_fconstexpr_steps_EQ)) {
      CmdArgs.push_back("-fconstexpr-steps");
      CmdArgs.push_back(A->getValue());
    }
  
    if (Args.hasArg(options::OPT_fexperimental_new_constant_interpreter))
      CmdArgs.push_back("-fexperimental-new-constant-interpreter");
  
    if (Arg *A = Args.getLastArg(options::OPT_fbracket_depth_EQ)) {
      CmdArgs.push_back("-fbracket-depth");
      CmdArgs.push_back(A->getValue());
    }
  
    if (Arg *A = Args.getLastArg(options::OPT_Wlarge_by_value_copy_EQ,
                                 options::OPT_Wlarge_by_value_copy_def)) {
      if (A->getNumValues()) {
        StringRef bytes = A->getValue();
        CmdArgs.push_back(Args.MakeArgString("-Wlarge-by-value-copy=" + bytes));
      } else
        CmdArgs.push_back("-Wlarge-by-value-copy=64"); // default value
    }
  
    if (Args.hasArg(options::OPT_relocatable_pch))
      CmdArgs.push_back("-relocatable-pch");
  
    if (const Arg *A = Args.getLastArg(options::OPT_fcf_runtime_abi_EQ)) {
      static const char *kCFABIs[] = {
        "standalone", "objc", "swift", "swift-5.0", "swift-4.2", "swift-4.1",
      };
  
      if (find(kCFABIs, StringRef(A->getValue())) == std::end(kCFABIs))
        D.Diag(diag::err_drv_invalid_cf_runtime_abi) << A->getValue();
      else
        A->render(Args, CmdArgs);
    }
  
    if (Arg *A = Args.getLastArg(options::OPT_fconstant_string_class_EQ)) {
      CmdArgs.push_back("-fconstant-string-class");
      CmdArgs.push_back(A->getValue());
    }
  
    if (Arg *A = Args.getLastArg(options::OPT_ftabstop_EQ)) {
      CmdArgs.push_back("-ftabstop");
      CmdArgs.push_back(A->getValue());
    }
  
    if (Args.hasFlag(options::OPT_fstack_size_section,
                     options::OPT_fno_stack_size_section, RawTriple.isPS4()))
      CmdArgs.push_back("-fstack-size-section");
  
    if (Args.hasArg(options::OPT_fstack_usage)) {
      CmdArgs.push_back("-stack-usage-file");
  
      if (Arg *OutputOpt = Args.getLastArg(options::OPT_o)) {
        SmallString<128> OutputFilename(OutputOpt->getValue());
        llvm::sys::path::replace_extension(OutputFilename, "su");
        CmdArgs.push_back(Args.MakeArgString(OutputFilename));
      } else
        CmdArgs.push_back(
            Args.MakeArgString(Twine(getBaseInputStem(Args, Inputs)) + ".su"));
    }
  
    CmdArgs.push_back("-ferror-limit");
    if (Arg *A = Args.getLastArg(options::OPT_ferror_limit_EQ))
      CmdArgs.push_back(A->getValue());
    else
      CmdArgs.push_back("19");
  
    if (Arg *A = Args.getLastArg(options::OPT_fmacro_backtrace_limit_EQ)) {
      CmdArgs.push_back("-fmacro-backtrace-limit");
      CmdArgs.push_back(A->getValue());
    }
  
    if (Arg *A = Args.getLastArg(options::OPT_ftemplate_backtrace_limit_EQ)) {
      CmdArgs.push_back("-ftemplate-backtrace-limit");
      CmdArgs.push_back(A->getValue());
    }
  
    if (Arg *A = Args.getLastArg(options::OPT_fconstexpr_backtrace_limit_EQ)) {
      CmdArgs.push_back("-fconstexpr-backtrace-limit");
      CmdArgs.push_back(A->getValue());
    }
  
    if (Arg *A = Args.getLastArg(options::OPT_fspell_checking_limit_EQ)) {
      CmdArgs.push_back("-fspell-checking-limit");
      CmdArgs.push_back(A->getValue());
    }
  
    // Pass -fmessage-length=.
    unsigned MessageLength = 0;
    if (Arg *A = Args.getLastArg(options::OPT_fmessage_length_EQ)) {
      StringRef V(A->getValue());
      if (V.getAsInteger(0, MessageLength))
        D.Diag(diag::err_drv_invalid_argument_to_option)
            << V << A->getOption().getName();
    } else {
      // If -fmessage-length=N was not specified, determine whether this is a
      // terminal and, if so, implicitly define -fmessage-length appropriately.
      MessageLength = llvm::sys::Process::StandardErrColumns();
    }
    if (MessageLength != 0)
      CmdArgs.push_back(
          Args.MakeArgString("-fmessage-length=" + Twine(MessageLength)));
  
    // -fvisibility= and -fvisibility-ms-compat are of a piece.
    if (const Arg *A = Args.getLastArg(options::OPT_fvisibility_EQ,
                                       options::OPT_fvisibility_ms_compat)) {
      if (A->getOption().matches(options::OPT_fvisibility_EQ)) {
        CmdArgs.push_back("-fvisibility");
        CmdArgs.push_back(A->getValue());
      } else {
        assert(A->getOption().matches(options::OPT_fvisibility_ms_compat));
        CmdArgs.push_back("-fvisibility");
        CmdArgs.push_back("hidden");
        CmdArgs.push_back("-ftype-visibility");
        CmdArgs.push_back("default");
      }
    }
  
    if (!RawTriple.isPS4())
      if (const Arg *A =
              Args.getLastArg(options::OPT_fvisibility_from_dllstorageclass,
                              options::OPT_fno_visibility_from_dllstorageclass)) {
        if (A->getOption().matches(
                options::OPT_fvisibility_from_dllstorageclass)) {
          CmdArgs.push_back("-fvisibility-from-dllstorageclass");
          Args.AddLastArg(CmdArgs, options::OPT_fvisibility_dllexport_EQ);
          Args.AddLastArg(CmdArgs, options::OPT_fvisibility_nodllstorageclass_EQ);
          Args.AddLastArg(CmdArgs, options::OPT_fvisibility_externs_dllimport_EQ);
          Args.AddLastArg(CmdArgs,
                          options::OPT_fvisibility_externs_nodllstorageclass_EQ);
        }
      }
  
    if (const Arg *A = Args.getLastArg(options::OPT_mignore_xcoff_visibility)) {
      if (Triple.isOSAIX())
        CmdArgs.push_back("-mignore-xcoff-visibility");
      else
        D.Diag(diag::err_drv_unsupported_opt_for_target)
            << A->getAsString(Args) << TripleStr;
    }
  
  
    if (Args.hasFlag(options::OPT_fvisibility_inlines_hidden,
                      options::OPT_fno_visibility_inlines_hidden, false))
      CmdArgs.push_back("-fvisibility-inlines-hidden");
  
    Args.AddLastArg(CmdArgs, options::OPT_fvisibility_inlines_hidden_static_local_var,
                             options::OPT_fno_visibility_inlines_hidden_static_local_var);
    Args.AddLastArg(CmdArgs, options::OPT_fvisibility_global_new_delete_hidden);
  
    Args.AddLastArg(CmdArgs, options::OPT_ftlsmodel_EQ);
  
    if (Args.hasFlag(options::OPT_fno_operator_names,
                     options::OPT_foperator_names, false))
      CmdArgs.push_back("-fno-operator-names");
  
    // Forward -f (flag) options which we can pass directly.
    Args.AddLastArg(CmdArgs, options::OPT_femit_all_decls);
    Args.AddLastArg(CmdArgs, options::OPT_fheinous_gnu_extensions);
    Args.AddLastArg(CmdArgs, options::OPT_fdigraphs, options::OPT_fno_digraphs);
    Args.AddLastArg(CmdArgs, options::OPT_femulated_tls,
                    options::OPT_fno_emulated_tls);
  
    // AltiVec-like language extensions aren't relevant for assembling.
    if (!isa<PreprocessJobAction>(JA) || Output.getType() != types::TY_PP_Asm)
      Args.AddLastArg(CmdArgs, options::OPT_fzvector);
  
    Args.AddLastArg(CmdArgs, options::OPT_fdiagnostics_show_template_tree);
    Args.AddLastArg(CmdArgs, options::OPT_fno_elide_type);
  
    // Forward flags for OpenMP. We don't do this if the current action is an
    // device offloading action other than OpenMP.
    if (Args.hasFlag(options::OPT_fopenmp, options::OPT_fopenmp_EQ,
                     options::OPT_fno_openmp, false) &&
        (JA.isDeviceOffloading(Action::OFK_None) ||
         JA.isDeviceOffloading(Action::OFK_OpenMP))) {
      switch (D.getOpenMPRuntime(Args)) {
      case Driver::OMPRT_OMP:
      case Driver::OMPRT_IOMP5:
        // Clang can generate useful OpenMP code for these two runtime libraries.
        CmdArgs.push_back("-fopenmp");
  
        // If no option regarding the use of TLS in OpenMP codegeneration is
        // given, decide a default based on the target. Otherwise rely on the
        // options and pass the right information to the frontend.
        if (!Args.hasFlag(options::OPT_fopenmp_use_tls,
                          options::OPT_fnoopenmp_use_tls, /*Default=*/true))
          CmdArgs.push_back("-fnoopenmp-use-tls");
        Args.AddLastArg(CmdArgs, options::OPT_fopenmp_simd,
                        options::OPT_fno_openmp_simd);
        Args.AddAllArgs(CmdArgs, options::OPT_fopenmp_enable_irbuilder);
        Args.AddAllArgs(CmdArgs, options::OPT_fopenmp_version_EQ);
        Args.AddAllArgs(CmdArgs, options::OPT_fopenmp_cuda_number_of_sm_EQ);
        Args.AddAllArgs(CmdArgs, options::OPT_fopenmp_cuda_blocks_per_sm_EQ);
        Args.AddAllArgs(CmdArgs,
                        options::OPT_fopenmp_cuda_teams_reduction_recs_num_EQ);
        if (Args.hasFlag(options::OPT_fopenmp_optimistic_collapse,
                         options::OPT_fno_openmp_optimistic_collapse,
                         /*Default=*/false))
          CmdArgs.push_back("-fopenmp-optimistic-collapse");
  
        // When in OpenMP offloading mode with NVPTX target, forward
        // cuda-mode flag
        if (Args.hasFlag(options::OPT_fopenmp_cuda_mode,
                         options::OPT_fno_openmp_cuda_mode, /*Default=*/false))
          CmdArgs.push_back("-fopenmp-cuda-mode");
  
        // When in OpenMP offloading mode with NVPTX target, check if full runtime
        // is required.
        if (Args.hasFlag(options::OPT_fopenmp_cuda_force_full_runtime,
                         options::OPT_fno_openmp_cuda_force_full_runtime,
                         /*Default=*/false))
          CmdArgs.push_back("-fopenmp-cuda-force-full-runtime");
        break;
      default:
        // By default, if Clang doesn't know how to generate useful OpenMP code
        // for a specific runtime library, we just don't pass the '-fopenmp' flag
        // down to the actual compilation.
        // FIXME: It would be better to have a mode which *only* omits IR
        // generation based on the OpenMP support so that we get consistent
        // semantic analysis, etc.
        break;
      }
    } else {
      Args.AddLastArg(CmdArgs, options::OPT_fopenmp_simd,
                      options::OPT_fno_openmp_simd);
      Args.AddAllArgs(CmdArgs, options::OPT_fopenmp_version_EQ);
    }
  
    const SanitizerArgs &Sanitize = TC.getSanitizerArgs();
    Sanitize.addArgs(TC, Args, CmdArgs, InputType);
  
    const XRayArgs &XRay = TC.getXRayArgs();
    XRay.addArgs(TC, Args, CmdArgs, InputType);
  
    for (const auto &Filename :
         Args.getAllArgValues(options::OPT_fprofile_list_EQ)) {
      if (D.getVFS().exists(Filename))
        CmdArgs.push_back(Args.MakeArgString("-fprofile-list=" + Filename));
      else
        D.Diag(clang::diag::err_drv_no_such_file) << Filename;
    }
  
    if (Arg *A = Args.getLastArg(options::OPT_fpatchable_function_entry_EQ)) {
      StringRef S0 = A->getValue(), S = S0;
      unsigned Size, Offset = 0;
      if (!Triple.isAArch64() && !Triple.isRISCV() && !Triple.isX86())
        D.Diag(diag::err_drv_unsupported_opt_for_target)
            << A->getAsString(Args) << TripleStr;
      else if (S.consumeInteger(10, Size) ||
               (!S.empty() && (!S.consume_front(",") ||
                               S.consumeInteger(10, Offset) || !S.empty())))
        D.Diag(diag::err_drv_invalid_argument_to_option)
            << S0 << A->getOption().getName();
      else if (Size < Offset)
        D.Diag(diag::err_drv_unsupported_fpatchable_function_entry_argument);
      else {
        CmdArgs.push_back(Args.MakeArgString(A->getSpelling() + Twine(Size)));
        CmdArgs.push_back(Args.MakeArgString(
            "-fpatchable-function-entry-offset=" + Twine(Offset)));
      }
    }
  
    if (TC.SupportsProfiling()) {
      Args.AddLastArg(CmdArgs, options::OPT_pg);
  
      llvm::Triple::ArchType Arch = TC.getArch();
      if (Arg *A = Args.getLastArg(options::OPT_mfentry)) {
        if (Arch == llvm::Triple::systemz || TC.getTriple().isX86())
          A->render(Args, CmdArgs);
        else
          D.Diag(diag::err_drv_unsupported_opt_for_target)
              << A->getAsString(Args) << TripleStr;
      }
      if (Arg *A = Args.getLastArg(options::OPT_mnop_mcount)) {
        if (Arch == llvm::Triple::systemz)
          A->render(Args, CmdArgs);
        else
          D.Diag(diag::err_drv_unsupported_opt_for_target)
              << A->getAsString(Args) << TripleStr;
      }
      if (Arg *A = Args.getLastArg(options::OPT_mrecord_mcount)) {
        if (Arch == llvm::Triple::systemz)
          A->render(Args, CmdArgs);
        else
          D.Diag(diag::err_drv_unsupported_opt_for_target)
              << A->getAsString(Args) << TripleStr;
      }
    }
  
    if (Args.getLastArg(options::OPT_fapple_kext) ||
        (Args.hasArg(options::OPT_mkernel) && types::isCXX(InputType)))
      CmdArgs.push_back("-fapple-kext");
  
    Args.AddLastArg(CmdArgs, options::OPT_altivec_src_compat);
    Args.AddLastArg(CmdArgs, options::OPT_flax_vector_conversions_EQ);
    Args.AddLastArg(CmdArgs, options::OPT_fobjc_sender_dependent_dispatch);
    Args.AddLastArg(CmdArgs, options::OPT_fdiagnostics_print_source_range_info);
    Args.AddLastArg(CmdArgs, options::OPT_fdiagnostics_parseable_fixits);
    Args.AddLastArg(CmdArgs, options::OPT_ftime_report);
    Args.AddLastArg(CmdArgs, options::OPT_ftime_report_EQ);
    Args.AddLastArg(CmdArgs, options::OPT_ftime_trace);
    Args.AddLastArg(CmdArgs, options::OPT_ftime_trace_granularity_EQ);
    Args.AddLastArg(CmdArgs, options::OPT_ftrapv);
    Args.AddLastArg(CmdArgs, options::OPT_malign_double);
    Args.AddLastArg(CmdArgs, options::OPT_fno_temp_file);
  
    if (Arg *A = Args.getLastArg(options::OPT_ftrapv_handler_EQ)) {
      CmdArgs.push_back("-ftrapv-handler");
      CmdArgs.push_back(A->getValue());
    }
  
    Args.AddLastArg(CmdArgs, options::OPT_ftrap_function_EQ);
  
    // -fno-strict-overflow implies -fwrapv if it isn't disabled, but
    // -fstrict-overflow won't turn off an explicitly enabled -fwrapv.
    if (Arg *A = Args.getLastArg(options::OPT_fwrapv, options::OPT_fno_wrapv)) {
      if (A->getOption().matches(options::OPT_fwrapv))
        CmdArgs.push_back("-fwrapv");
    } else if (Arg *A = Args.getLastArg(options::OPT_fstrict_overflow,
                                        options::OPT_fno_strict_overflow)) {
      if (A->getOption().matches(options::OPT_fno_strict_overflow))
        CmdArgs.push_back("-fwrapv");
    }
  
    if (Arg *A = Args.getLastArg(options::OPT_freroll_loops,
                                 options::OPT_fno_reroll_loops))
      if (A->getOption().matches(options::OPT_freroll_loops))
        CmdArgs.push_back("-freroll-loops");
  
    Args.AddLastArg(CmdArgs, options::OPT_ffinite_loops,
                    options::OPT_fno_finite_loops);
  
    Args.AddLastArg(CmdArgs, options::OPT_fwritable_strings);
    Args.AddLastArg(CmdArgs, options::OPT_funroll_loops,
                    options::OPT_fno_unroll_loops);
  
    Args.AddLastArg(CmdArgs, options::OPT_pthread);
  
    if (Args.hasFlag(options::OPT_mspeculative_load_hardening,
                     options::OPT_mno_speculative_load_hardening, false))
      CmdArgs.push_back(Args.MakeArgString("-mspeculative-load-hardening"));
  
    RenderSSPOptions(D, TC, Args, CmdArgs, KernelOrKext);
    RenderSCPOptions(TC, Args, CmdArgs);
    RenderTrivialAutoVarInitOptions(D, TC, Args, CmdArgs);
  
    // Translate -mstackrealign
    if (Args.hasFlag(options::OPT_mstackrealign, options::OPT_mno_stackrealign,
                     false))
      CmdArgs.push_back(Args.MakeArgString("-mstackrealign"));
  
    if (Args.hasArg(options::OPT_mstack_alignment)) {
      StringRef alignment = Args.getLastArgValue(options::OPT_mstack_alignment);
      CmdArgs.push_back(Args.MakeArgString("-mstack-alignment=" + alignment));
    }
  
    if (Args.hasArg(options::OPT_mstack_probe_size)) {
      StringRef Size = Args.getLastArgValue(options::OPT_mstack_probe_size);
  
      if (!Size.empty())
        CmdArgs.push_back(Args.MakeArgString("-mstack-probe-size=" + Size));
      else
        CmdArgs.push_back("-mstack-probe-size=0");
    }
  
    if (!Args.hasFlag(options::OPT_mstack_arg_probe,
                      options::OPT_mno_stack_arg_probe, true))
      CmdArgs.push_back(Args.MakeArgString("-mno-stack-arg-probe"));
  
    if (Arg *A = Args.getLastArg(options::OPT_mrestrict_it,
                                 options::OPT_mno_restrict_it)) {
      if (A->getOption().matches(options::OPT_mrestrict_it)) {
        CmdArgs.push_back("-mllvm");
        CmdArgs.push_back("-arm-restrict-it");
      } else {
        CmdArgs.push_back("-mllvm");
        CmdArgs.push_back("-arm-no-restrict-it");
      }
    } else if (Triple.isOSWindows() &&
               (Triple.getArch() == llvm::Triple::arm ||
                Triple.getArch() == llvm::Triple::thumb)) {
      // Windows on ARM expects restricted IT blocks
      CmdArgs.push_back("-mllvm");
      CmdArgs.push_back("-arm-restrict-it");
    }
  
    // Forward -cl options to -cc1
    RenderOpenCLOptions(Args, CmdArgs, InputType);
  
    if (IsHIP) {
      if (Args.hasFlag(options::OPT_fhip_new_launch_api,
                       options::OPT_fno_hip_new_launch_api, true))
        CmdArgs.push_back("-fhip-new-launch-api");
      if (Args.hasFlag(options::OPT_fgpu_allow_device_init,
                       options::OPT_fno_gpu_allow_device_init, false))
        CmdArgs.push_back("-fgpu-allow-device-init");
    }
  
    if (IsCuda || IsHIP) {
      if (Args.hasFlag(options::OPT_fgpu_rdc, options::OPT_fno_gpu_rdc, false))
        CmdArgs.push_back("-fgpu-rdc");
      if (Args.hasFlag(options::OPT_fgpu_defer_diag,
                       options::OPT_fno_gpu_defer_diag, false))
        CmdArgs.push_back("-fgpu-defer-diag");
      if (Args.hasFlag(options::OPT_fgpu_exclude_wrong_side_overloads,
                       options::OPT_fno_gpu_exclude_wrong_side_overloads,
                       false)) {
        CmdArgs.push_back("-fgpu-exclude-wrong-side-overloads");
        CmdArgs.push_back("-fgpu-defer-diag");
      }
    }
  
    if (Arg *A = Args.getLastArg(options::OPT_fcf_protection_EQ)) {
      CmdArgs.push_back(
          Args.MakeArgString(Twine("-fcf-protection=") + A->getValue()));
    }
  
    // Forward -f options with positive and negative forms; we translate these by
    // hand.  Do not propagate PGO options to the GPU-side compilations as the
    // profile info is for the host-side compilation only.
    if (!(IsCudaDevice || IsHIPDevice)) {
      if (Arg *A = getLastProfileSampleUseArg(Args)) {
        auto *PGOArg = Args.getLastArg(
            options::OPT_fprofile_generate, options::OPT_fprofile_generate_EQ,
            options::OPT_fcs_profile_generate,
            options::OPT_fcs_profile_generate_EQ, options::OPT_fprofile_use,
            options::OPT_fprofile_use_EQ);
        if (PGOArg)
          D.Diag(diag::err_drv_argument_not_allowed_with)
              << "SampleUse with PGO options";
  
        StringRef fname = A->getValue();
        if (!llvm::sys::fs::exists(fname))
          D.Diag(diag::err_drv_no_such_file) << fname;
        else
          A->render(Args, CmdArgs);
      }
      Args.AddLastArg(CmdArgs, options::OPT_fprofile_remapping_file_EQ);
  
      if (Args.hasFlag(options::OPT_fpseudo_probe_for_profiling,
                       options::OPT_fno_pseudo_probe_for_profiling, false))
        CmdArgs.push_back("-fpseudo-probe-for-profiling");
    }
    RenderBuiltinOptions(TC, RawTriple, Args, CmdArgs);
  
    if (!Args.hasFlag(options::OPT_fassume_sane_operator_new,
                      options::OPT_fno_assume_sane_operator_new))
      CmdArgs.push_back("-fno-assume-sane-operator-new");
  
    if (Args.hasFlag(options::OPT_fapinotes, options::OPT_fno_apinotes, false) ||
        Args.hasFlag(options::OPT_fapinotes_modules,
                     options::OPT_fno_apinotes_modules, false) ||
        Args.hasArg(options::OPT_iapinotes_modules)) {
      if (Args.hasFlag(options::OPT_fapinotes, options::OPT_fno_apinotes, false))
        CmdArgs.push_back("-fapinotes");
      if (Args.hasFlag(options::OPT_fapinotes_modules,
                       options::OPT_fno_apinotes_modules, false))
        CmdArgs.push_back("-fapinotes-modules");
  
      Args.AddLastArg(CmdArgs, options::OPT_fapinotes_swift_version);
    }
  
    // -fblocks=0 is default.
    if (Args.hasFlag(options::OPT_fblocks, options::OPT_fno_blocks,
                     TC.IsBlocksDefault()) ||
        (Args.hasArg(options::OPT_fgnu_runtime) &&
         Args.hasArg(options::OPT_fobjc_nonfragile_abi) &&
         !Args.hasArg(options::OPT_fno_blocks))) {
      CmdArgs.push_back("-fblocks");
  
      if (!Args.hasArg(options::OPT_fgnu_runtime) && !TC.hasBlocksRuntime())
        CmdArgs.push_back("-fblocks-runtime-optional");
    }
  
    // -fencode-extended-block-signature=1 is default.
    if (TC.IsEncodeExtendedBlockSignatureDefault())
      CmdArgs.push_back("-fencode-extended-block-signature");
  
    if (Args.hasFlag(options::OPT_fcoroutines_ts, options::OPT_fno_coroutines_ts,
                     false) &&
        types::isCXX(InputType)) {
      CmdArgs.push_back("-fcoroutines-ts");
    }
  
    Args.AddLastArg(CmdArgs, options::OPT_fdouble_square_bracket_attributes,
                    options::OPT_fno_double_square_bracket_attributes);
  
    // -faccess-control is default.
    if (Args.hasFlag(options::OPT_fno_access_control,
                     options::OPT_faccess_control, false))
      CmdArgs.push_back("-fno-access-control");
  
    // -felide-constructors is the default.
    if (Args.hasFlag(options::OPT_fno_elide_constructors,
                     options::OPT_felide_constructors, false))
      CmdArgs.push_back("-fno-elide-constructors");
  
    ToolChain::RTTIMode RTTIMode = TC.getRTTIMode();
  
    if (KernelOrKext || (types::isCXX(InputType) &&
                         (RTTIMode == ToolChain::RM_Disabled)))
      CmdArgs.push_back("-fno-rtti");
  
    // -fshort-enums=0 is default for all architectures except Hexagon and z/OS.
    if (Args.hasFlag(options::OPT_fshort_enums, options::OPT_fno_short_enums,
                     TC.getArch() == llvm::Triple::hexagon || Triple.isOSzOS()))
      CmdArgs.push_back("-fshort-enums");
  
    RenderCharacterOptions(Args, AuxTriple ? *AuxTriple : RawTriple, CmdArgs);
  
    // -fuse-cxa-atexit is default.
    if (!Args.hasFlag(
            options::OPT_fuse_cxa_atexit, options::OPT_fno_use_cxa_atexit,
            !RawTriple.isOSAIX() && !RawTriple.isOSWindows() &&
                TC.getArch() != llvm::Triple::xcore &&
                ((RawTriple.getVendor() != llvm::Triple::MipsTechnologies) ||
                 RawTriple.hasEnvironment())) ||
        KernelOrKext)
      CmdArgs.push_back("-fno-use-cxa-atexit");
  
    if (Args.hasFlag(options::OPT_fregister_global_dtors_with_atexit,
                     options::OPT_fno_register_global_dtors_with_atexit,
                     RawTriple.isOSDarwin() && !KernelOrKext))
      CmdArgs.push_back("-fregister-global-dtors-with-atexit");
  
    // -fno-use-line-directives is default.
    if (Args.hasFlag(options::OPT_fuse_line_directives,
                     options::OPT_fno_use_line_directives, false))
      CmdArgs.push_back("-fuse-line-directives");
  
    // -fms-extensions=0 is default.
    if (Args.hasFlag(options::OPT_fms_extensions, options::OPT_fno_ms_extensions,
                     IsWindowsMSVC))
      CmdArgs.push_back("-fms-extensions");
  
    // -fms-compatibility=0 is default.
    bool IsMSVCCompat = Args.hasFlag(
        options::OPT_fms_compatibility, options::OPT_fno_ms_compatibility,
        (IsWindowsMSVC && Args.hasFlag(options::OPT_fms_extensions,
                                       options::OPT_fno_ms_extensions, true)));
    if (IsMSVCCompat)
      CmdArgs.push_back("-fms-compatibility");
  
    // Handle -fgcc-version, if present.
    VersionTuple GNUCVer;
    if (Arg *A = Args.getLastArg(options::OPT_fgnuc_version_EQ)) {
      // Check that the version has 1 to 3 components and the minor and patch
      // versions fit in two decimal digits.
      StringRef Val = A->getValue();
      Val = Val.empty() ? "0" : Val; // Treat "" as 0 or disable.
      bool Invalid = GNUCVer.tryParse(Val);
      unsigned Minor = GNUCVer.getMinor().getValueOr(0);
      unsigned Patch = GNUCVer.getSubminor().getValueOr(0);
      if (Invalid || GNUCVer.getBuild() || Minor >= 100 || Patch >= 100) {
        D.Diag(diag::err_drv_invalid_value)
            << A->getAsString(Args) << A->getValue();
      }
    } else if (!IsMSVCCompat) {
      // Imitate GCC 4.2.1 by default if -fms-compatibility is not in effect.
      GNUCVer = VersionTuple(4, 2, 1);
    }
    if (!GNUCVer.empty()) {
      CmdArgs.push_back(
          Args.MakeArgString("-fgnuc-version=" + GNUCVer.getAsString()));
    }
  
    VersionTuple MSVT = TC.computeMSVCVersion(&D, Args);
    if (!MSVT.empty())
      CmdArgs.push_back(
          Args.MakeArgString("-fms-compatibility-version=" + MSVT.getAsString()));
  
    bool IsMSVC2015Compatible = MSVT.getMajor() >= 19;
    if (ImplyVCPPCVer) {
      StringRef LanguageStandard;
      if (const Arg *StdArg = Args.getLastArg(options::OPT__SLASH_std)) {
        Std = StdArg;
        LanguageStandard = llvm::StringSwitch<StringRef>(StdArg->getValue())
                               .Case("c11", "-std=c11")
                               .Case("c17", "-std=c17")
                               .Default("");
        if (LanguageStandard.empty())
          D.Diag(clang::diag::warn_drv_unused_argument)
              << StdArg->getAsString(Args);
      }
      CmdArgs.push_back(LanguageStandard.data());
    }
    if (ImplyVCPPCXXVer) {
      StringRef LanguageStandard;
      if (const Arg *StdArg = Args.getLastArg(options::OPT__SLASH_std)) {
        Std = StdArg;
        LanguageStandard = llvm::StringSwitch<StringRef>(StdArg->getValue())
                               .Case("c++14", "-std=c++14")
                               .Case("c++17", "-std=c++17")
                               .Case("c++20", "-std=c++20")
                               .Case("c++latest", "-std=c++2b")
                               .Default("");
        if (LanguageStandard.empty())
          D.Diag(clang::diag::warn_drv_unused_argument)
              << StdArg->getAsString(Args);
      }
  
      if (LanguageStandard.empty()) {
        if (IsMSVC2015Compatible)
          LanguageStandard = "-std=c++14";
        else
          LanguageStandard = "-std=c++11";
      }
  
      CmdArgs.push_back(LanguageStandard.data());
    }
  
    // -fno-borland-extensions is default.
    if (Args.hasFlag(options::OPT_fborland_extensions,
                     options::OPT_fno_borland_extensions, false))
      CmdArgs.push_back("-fborland-extensions");
  
    // -fno-declspec is default, except for PS4.
    if (Args.hasFlag(options::OPT_fdeclspec, options::OPT_fno_declspec,
                     RawTriple.isPS4()))
      CmdArgs.push_back("-fdeclspec");
    else if (Args.hasArg(options::OPT_fno_declspec))
      CmdArgs.push_back("-fno-declspec"); // Explicitly disabling __declspec.
  
    // -fthreadsafe-static is default, except for MSVC compatibility versions less
    // than 19.
    if (!Args.hasFlag(options::OPT_fthreadsafe_statics,
                      options::OPT_fno_threadsafe_statics,
                      !IsWindowsMSVC || IsMSVC2015Compatible))
      CmdArgs.push_back("-fno-threadsafe-statics");
  
    // -fno-delayed-template-parsing is default, except when targeting MSVC.
    // Many old Windows SDK versions require this to parse.
    // FIXME: MSVC introduced /Zc:twoPhase- to disable this behavior in their
    // compiler. We should be able to disable this by default at some point.
    if (Args.hasFlag(options::OPT_fdelayed_template_parsing,
                     options::OPT_fno_delayed_template_parsing, IsWindowsMSVC))
      CmdArgs.push_back("-fdelayed-template-parsing");
  
    // -fgnu-keywords default varies depending on language; only pass if
    // specified.
    Args.AddLastArg(CmdArgs, options::OPT_fgnu_keywords,
                    options::OPT_fno_gnu_keywords);
  
    if (Args.hasFlag(options::OPT_fgnu89_inline, options::OPT_fno_gnu89_inline,
                     false))
      CmdArgs.push_back("-fgnu89-inline");
  
    if (Args.hasArg(options::OPT_fno_inline))
      CmdArgs.push_back("-fno-inline");
  
    Args.AddLastArg(CmdArgs, options::OPT_finline_functions,
                    options::OPT_finline_hint_functions,
                    options::OPT_fno_inline_functions);
  
    // FIXME: Find a better way to determine whether the language has modules
    // support by default, or just assume that all languages do.
    bool HaveModules =
        Std && (Std->containsValue("c++2a") || Std->containsValue("c++20") ||
                Std->containsValue("c++latest"));
    RenderModulesOptions(C, D, Args, Input, Output, CmdArgs, HaveModules);
  
    if (Args.hasFlag(options::OPT_fpch_validate_input_files_content,
                     options::OPT_fno_pch_validate_input_files_content, false))
      CmdArgs.push_back("-fvalidate-ast-input-files-content");
    if (Args.hasFlag(options::OPT_fpch_instantiate_templates,
                     options::OPT_fno_pch_instantiate_templates, false))
      CmdArgs.push_back("-fpch-instantiate-templates");
    if (Args.hasFlag(options::OPT_fpch_codegen, options::OPT_fno_pch_codegen,
                     false))
      CmdArgs.push_back("-fmodules-codegen");
    if (Args.hasFlag(options::OPT_fpch_debuginfo, options::OPT_fno_pch_debuginfo,
                     false))
      CmdArgs.push_back("-fmodules-debuginfo");
  
    Args.AddLastArg(CmdArgs, options::OPT_flegacy_pass_manager,
                    options::OPT_fno_legacy_pass_manager);
  
    ObjCRuntime Runtime = AddObjCRuntimeArgs(Args, Inputs, CmdArgs, rewriteKind);
    RenderObjCOptions(TC, D, RawTriple, Args, Runtime, rewriteKind != RK_None,
                      Input, CmdArgs);
  
    if (types::isObjC(Input.getType()) &&
        Args.hasFlag(options::OPT_fobjc_encode_cxx_class_template_spec,
                     options::OPT_fno_objc_encode_cxx_class_template_spec,
                     !Runtime.isNeXTFamily()))
      CmdArgs.push_back("-fobjc-encode-cxx-class-template-spec");
  
    if (Args.hasFlag(options::OPT_fapplication_extension,
                     options::OPT_fno_application_extension, false))
      CmdArgs.push_back("-fapplication-extension");
  
    // Handle GCC-style exception args.
    bool EH = false;
    if (!C.getDriver().IsCLMode())
      EH = addExceptionArgs(Args, InputType, TC, KernelOrKext, Runtime, CmdArgs);
  
    // Handle exception personalities
    Arg *A = Args.getLastArg(
        options::OPT_fsjlj_exceptions, options::OPT_fseh_exceptions,
        options::OPT_fdwarf_exceptions, options::OPT_fwasm_exceptions);
    if (A) {
      const Option &Opt = A->getOption();
      if (Opt.matches(options::OPT_fsjlj_exceptions))
        CmdArgs.push_back("-exception-model=sjlj");
      if (Opt.matches(options::OPT_fseh_exceptions))
        CmdArgs.push_back("-exception-model=seh");
      if (Opt.matches(options::OPT_fdwarf_exceptions))
        CmdArgs.push_back("-exception-model=dwarf");
      if (Opt.matches(options::OPT_fwasm_exceptions))
        CmdArgs.push_back("-exception-model=wasm");
    } else {
      switch (TC.GetExceptionModel(Args)) {
      default:
        break;
      case llvm::ExceptionHandling::DwarfCFI:
        CmdArgs.push_back("-exception-model=dwarf");
        break;
      case llvm::ExceptionHandling::SjLj:
        CmdArgs.push_back("-exception-model=sjlj");
        break;
      case llvm::ExceptionHandling::WinEH:
        CmdArgs.push_back("-exception-model=seh");
        break;
      }
    }
  
    // C++ "sane" operator new.
    if (!Args.hasFlag(options::OPT_fassume_sane_operator_new,
                      options::OPT_fno_assume_sane_operator_new))
      CmdArgs.push_back("-fno-assume-sane-operator-new");
  
    // -frelaxed-template-template-args is off by default, as it is a severe
    // breaking change until a corresponding change to template partial ordering
    // is provided.
    if (Args.hasFlag(options::OPT_frelaxed_template_template_args,
                     options::OPT_fno_relaxed_template_template_args, false))
      CmdArgs.push_back("-frelaxed-template-template-args");
  
    // -fsized-deallocation is off by default, as it is an ABI-breaking change for
    // most platforms.
    if (Args.hasFlag(options::OPT_fsized_deallocation,
                     options::OPT_fno_sized_deallocation, false))
      CmdArgs.push_back("-fsized-deallocation");
  
    // -faligned-allocation is on by default in C++17 onwards and otherwise off
    // by default.
    if (Arg *A = Args.getLastArg(options::OPT_faligned_allocation,
                                 options::OPT_fno_aligned_allocation,
                                 options::OPT_faligned_new_EQ)) {
      if (A->getOption().matches(options::OPT_fno_aligned_allocation))
        CmdArgs.push_back("-fno-aligned-allocation");
      else
        CmdArgs.push_back("-faligned-allocation");
    }
  
    // The default new alignment can be specified using a dedicated option or via
    // a GCC-compatible option that also turns on aligned allocation.
    if (Arg *A = Args.getLastArg(options::OPT_fnew_alignment_EQ,
                                 options::OPT_faligned_new_EQ))
      CmdArgs.push_back(
          Args.MakeArgString(Twine("-fnew-alignment=") + A->getValue()));
  
    // -fconstant-cfstrings is default, and may be subject to argument translation
    // on Darwin.
    if (!Args.hasFlag(options::OPT_fconstant_cfstrings,
                      options::OPT_fno_constant_cfstrings) ||
        !Args.hasFlag(options::OPT_mconstant_cfstrings,
                      options::OPT_mno_constant_cfstrings))
      CmdArgs.push_back("-fno-constant-cfstrings");
  
    // -fno-pascal-strings is default, only pass non-default.
    if (Args.hasFlag(options::OPT_fpascal_strings,
                     options::OPT_fno_pascal_strings, false))
      CmdArgs.push_back("-fpascal-strings");
  
    // Honor -fpack-struct= and -fpack-struct, if given. Note that
    // -fno-pack-struct doesn't apply to -fpack-struct=.
    if (Arg *A = Args.getLastArg(options::OPT_fpack_struct_EQ)) {
      std::string PackStructStr = "-fpack-struct=";
      PackStructStr += A->getValue();
      CmdArgs.push_back(Args.MakeArgString(PackStructStr));
    } else if (Args.hasFlag(options::OPT_fpack_struct,
                            options::OPT_fno_pack_struct, false)) {
      CmdArgs.push_back("-fpack-struct=1");
    }
  
    // Handle -fmax-type-align=N and -fno-type-align
    bool SkipMaxTypeAlign = Args.hasArg(options::OPT_fno_max_type_align);
    if (Arg *A = Args.getLastArg(options::OPT_fmax_type_align_EQ)) {
      if (!SkipMaxTypeAlign) {
        std::string MaxTypeAlignStr = "-fmax-type-align=";
        MaxTypeAlignStr += A->getValue();
        CmdArgs.push_back(Args.MakeArgString(MaxTypeAlignStr));
      }
    } else if (RawTriple.isOSDarwin()) {
      if (!SkipMaxTypeAlign) {
        std::string MaxTypeAlignStr = "-fmax-type-align=16";
        CmdArgs.push_back(Args.MakeArgString(MaxTypeAlignStr));
      }
    }
  
    if (!Args.hasFlag(options::OPT_Qy, options::OPT_Qn, true))
      CmdArgs.push_back("-Qn");
  
    // -fno-common is the default, set -fcommon only when that flag is set.
    if (Args.hasFlag(options::OPT_fcommon, options::OPT_fno_common, false))
      CmdArgs.push_back("-fcommon");
  
    if (Args.hasFlag(options::OPT_fptrauth_intrinsics,
                     options::OPT_fno_ptrauth_intrinsics, false))
      CmdArgs.push_back("-fptrauth-intrinsics");
  
    if (Args.hasFlag(options::OPT_fptrauth_calls,
                     options::OPT_fno_ptrauth_calls, false))
      CmdArgs.push_back("-fptrauth-calls");
  
    if (Args.hasFlag(options::OPT_fptrauth_returns,
                     options::OPT_fno_ptrauth_returns, false))
      CmdArgs.push_back("-fptrauth-returns");
  
    if (Args.hasFlag(options::OPT_fptrauth_indirect_gotos,
                     options::OPT_fno_ptrauth_indirect_gotos, false))
      CmdArgs.push_back("-fptrauth-indirect-gotos");
  
    if (Args.hasFlag(options::OPT_fptrauth_auth_traps,
                     options::OPT_fno_ptrauth_auth_traps, false))
      CmdArgs.push_back("-fptrauth-auth-traps");
  
    if (Args.hasFlag(options::OPT_fptrauth_soft,
                     options::OPT_fno_ptrauth_soft, false))
      CmdArgs.push_back("-fptrauth-soft");
  
    // -fsigned-bitfields is default, and clang doesn't yet support
    // -funsigned-bitfields.
    if (!Args.hasFlag(options::OPT_fsigned_bitfields,
                      options::OPT_funsigned_bitfields))
      D.Diag(diag::warn_drv_clang_unsupported)
          << Args.getLastArg(options::OPT_funsigned_bitfields)->getAsString(Args);
  
    // -fsigned-bitfields is default, and clang doesn't support -fno-for-scope.
    if (!Args.hasFlag(options::OPT_ffor_scope, options::OPT_fno_for_scope))
      D.Diag(diag::err_drv_clang_unsupported)
          << Args.getLastArg(options::OPT_fno_for_scope)->getAsString(Args);
  
    // -finput_charset=UTF-8 is default. Reject others
    if (Arg *inputCharset = Args.getLastArg(options::OPT_finput_charset_EQ)) {
      StringRef value = inputCharset->getValue();
      if (!value.equals_insensitive("utf-8"))
        D.Diag(diag::err_drv_invalid_value) << inputCharset->getAsString(Args)
                                            << value;
    }
  
    // -fexec_charset=UTF-8 is default. Reject others
    if (Arg *execCharset = Args.getLastArg(options::OPT_fexec_charset_EQ)) {
      StringRef value = execCharset->getValue();
      if (!value.equals_insensitive("utf-8"))
        D.Diag(diag::err_drv_invalid_value) << execCharset->getAsString(Args)
                                            << value;
    }
  
    RenderDiagnosticsOptions(D, Args, CmdArgs);
  
    // -fno-asm-blocks is default.
    if (Args.hasFlag(options::OPT_fasm_blocks, options::OPT_fno_asm_blocks,
                     false))
      CmdArgs.push_back("-fasm-blocks");
  
    // -fgnu-inline-asm is default.
    if (!Args.hasFlag(options::OPT_fgnu_inline_asm,
                      options::OPT_fno_gnu_inline_asm, true))
      CmdArgs.push_back("-fno-gnu-inline-asm");
  
    // Enable vectorization per default according to the optimization level
    // selected. For optimization levels that want vectorization we use the alias
    // option to simplify the hasFlag logic.
    bool EnableVec = shouldEnableVectorizerAtOLevel(Args, false);
    OptSpecifier VectorizeAliasOption =
        EnableVec ? options::OPT_O_Group : options::OPT_fvectorize;
    if (Args.hasFlag(options::OPT_fvectorize, VectorizeAliasOption,
                     options::OPT_fno_vectorize, EnableVec))
      CmdArgs.push_back("-vectorize-loops");
  
    // -fslp-vectorize is enabled based on the optimization level selected.
    bool EnableSLPVec = shouldEnableVectorizerAtOLevel(Args, true);
    OptSpecifier SLPVectAliasOption =
        EnableSLPVec ? options::OPT_O_Group : options::OPT_fslp_vectorize;
    if (Args.hasFlag(options::OPT_fslp_vectorize, SLPVectAliasOption,
                     options::OPT_fno_slp_vectorize, EnableSLPVec))
      CmdArgs.push_back("-vectorize-slp");
  
    ParseMPreferVectorWidth(D, Args, CmdArgs);
  
    Args.AddLastArg(CmdArgs, options::OPT_fshow_overloads_EQ);
    Args.AddLastArg(CmdArgs,
                    options::OPT_fsanitize_undefined_strip_path_components_EQ);
  
    // -fdollars-in-identifiers default varies depending on platform and
    // language; only pass if specified.
    if (Arg *A = Args.getLastArg(options::OPT_fdollars_in_identifiers,
                                 options::OPT_fno_dollars_in_identifiers)) {
      if (A->getOption().matches(options::OPT_fdollars_in_identifiers))
        CmdArgs.push_back("-fdollars-in-identifiers");
      else
        CmdArgs.push_back("-fno-dollars-in-identifiers");
    }
  
    // -funit-at-a-time is default, and we don't support -fno-unit-at-a-time for
    // practical purposes.
    if (Arg *A = Args.getLastArg(options::OPT_funit_at_a_time,
                                 options::OPT_fno_unit_at_a_time)) {
      if (A->getOption().matches(options::OPT_fno_unit_at_a_time))
        D.Diag(diag::warn_drv_clang_unsupported) << A->getAsString(Args);
    }
  
    if (Args.hasFlag(options::OPT_fapple_pragma_pack,
                     options::OPT_fno_apple_pragma_pack, false))
      CmdArgs.push_back("-fapple-pragma-pack");
  
    if (Args.hasFlag(options::OPT_fxl_pragma_pack,
                     options::OPT_fno_xl_pragma_pack, RawTriple.isOSAIX()))
      CmdArgs.push_back("-fxl-pragma-pack");
  
    // Remarks can be enabled with any of the `-f.*optimization-record.*` flags.
    if (willEmitRemarks(Args) && checkRemarksOptions(D, Args, Triple))
      renderRemarksOptions(Args, CmdArgs, Triple, Input, Output, JA);
  
    bool RewriteImports = Args.hasFlag(options::OPT_frewrite_imports,
                                       options::OPT_fno_rewrite_imports, false);
    if (RewriteImports)
      CmdArgs.push_back("-frewrite-imports");
  
    // Enable rewrite includes if the user's asked for it or if we're generating
    // diagnostics.
    // TODO: Once -module-dependency-dir works with -frewrite-includes it'd be
    // nice to enable this when doing a crashdump for modules as well.
    if (Args.hasFlag(options::OPT_frewrite_includes,
                     options::OPT_fno_rewrite_includes, false) ||
        (C.isForDiagnostics() && !HaveModules))
      CmdArgs.push_back("-frewrite-includes");
  
    // Only allow -traditional or -traditional-cpp outside in preprocessing modes.
    if (Arg *A = Args.getLastArg(options::OPT_traditional,
                                 options::OPT_traditional_cpp)) {
      if (isa<PreprocessJobAction>(JA))
        CmdArgs.push_back("-traditional-cpp");
      else
        D.Diag(diag::err_drv_clang_unsupported) << A->getAsString(Args);
    }
  
    Args.AddLastArg(CmdArgs, options::OPT_dM);
    Args.AddLastArg(CmdArgs, options::OPT_dD);
  
    Args.AddLastArg(CmdArgs, options::OPT_fmax_tokens_EQ);
  
    // Handle serialized diagnostics.
    if (Arg *A = Args.getLastArg(options::OPT__serialize_diags)) {
      CmdArgs.push_back("-serialize-diagnostic-file");
      CmdArgs.push_back(Args.MakeArgString(A->getValue()));
    }
  
    if (Args.hasArg(options::OPT_fretain_comments_from_system_headers))
      CmdArgs.push_back("-fretain-comments-from-system-headers");
  
    // Forward -fcomment-block-commands to -cc1.
    Args.AddAllArgs(CmdArgs, options::OPT_fcomment_block_commands);
    // Forward -fparse-all-comments to -cc1.
    Args.AddAllArgs(CmdArgs, options::OPT_fparse_all_comments);
  
    // Turn -fplugin=name.so into -load name.so
    for (const Arg *A : Args.filtered(options::OPT_fplugin_EQ)) {
      CmdArgs.push_back("-load");
      CmdArgs.push_back(A->getValue());
      A->claim();
    }
  
    // Forward -fpass-plugin=name.so to -cc1.
    for (const Arg *A : Args.filtered(options::OPT_fpass_plugin_EQ)) {
      CmdArgs.push_back(
          Args.MakeArgString(Twine("-fpass-plugin=") + A->getValue()));
      A->claim();
    }
  
    // Setup statistics file output.
    SmallString<128> StatsFile = getStatsFileName(Args, Output, Input, D);
    if (!StatsFile.empty())
      CmdArgs.push_back(Args.MakeArgString(Twine("-stats-file=") + StatsFile));
  
    // Forward -Xclang arguments to -cc1, and -mllvm arguments to the LLVM option
    // parser.
    // -finclude-default-header flag is for preprocessor,
    // do not pass it to other cc1 commands when save-temps is enabled
    if (C.getDriver().isSaveTempsEnabled() &&
        !isa<PreprocessJobAction>(JA)) {
      for (auto Arg : Args.filtered(options::OPT_Xclang)) {
        Arg->claim();
        if (StringRef(Arg->getValue()) != "-finclude-default-header")
          CmdArgs.push_back(Arg->getValue());
      }
    }
    else {
      Args.AddAllArgValues(CmdArgs, options::OPT_Xclang);
    }
    for (const Arg *A : Args.filtered(options::OPT_mllvm)) {
      A->claim();
  
      // We translate this by hand to the -cc1 argument, since nightly test uses
      // it and developers have been trained to spell it with -mllvm. Both
      // spellings are now deprecated and should be removed.
      if (StringRef(A->getValue(0)) == "-disable-llvm-optzns") {
        CmdArgs.push_back("-disable-llvm-optzns");
      } else {
        A->render(Args, CmdArgs);
      }
    }
  
    // With -save-temps, we want to save the unoptimized bitcode output from the
    // CompileJobAction, use -disable-llvm-passes to get pristine IR generated
    // by the frontend.
    // When -fembed-bitcode is enabled, optimized bitcode is emitted because it
    // has slightly different breakdown between stages.
    // FIXME: -fembed-bitcode -save-temps will save optimized bitcode instead of
    // pristine IR generated by the frontend. Ideally, a new compile action should
    // be added so both IR can be captured.
    if ((C.getDriver().isSaveTempsEnabled() ||
         JA.isHostOffloading(Action::OFK_OpenMP)) &&
        !(C.getDriver().embedBitcodeInObject() && !IsUsingLTO) &&
        isa<CompileJobAction>(JA))
      CmdArgs.push_back("-disable-llvm-passes");
  
    Args.AddAllArgs(CmdArgs, options::OPT_undef);
  
    const char *Exec = D.getClangProgramPath();
  
    // Optionally embed the -cc1 level arguments into the debug info or a
    // section, for build analysis.
    // Also record command line arguments into the debug info if
    // -grecord-gcc-switches options is set on.
    // By default, -gno-record-gcc-switches is set on and no recording.
    auto GRecordSwitches =
        Args.hasFlag(options::OPT_grecord_command_line,
                     options::OPT_gno_record_command_line, false);
    auto FRecordSwitches =
        Args.hasFlag(options::OPT_frecord_command_line,
                     options::OPT_fno_record_command_line, false);
    if (FRecordSwitches && !Triple.isOSBinFormatELF())
      D.Diag(diag::err_drv_unsupported_opt_for_target)
          << Args.getLastArg(options::OPT_frecord_command_line)->getAsString(Args)
          << TripleStr;
    if (TC.UseDwarfDebugFlags() || GRecordSwitches || FRecordSwitches) {
      ArgStringList OriginalArgs;
      for (const auto &Arg : Args)
        Arg->render(Args, OriginalArgs);
  
      SmallString<256> Flags;
      EscapeSpacesAndBackslashes(Exec, Flags);
      for (const char *OriginalArg : OriginalArgs) {
        SmallString<128> EscapedArg;
        EscapeSpacesAndBackslashes(OriginalArg, EscapedArg);
        Flags += " ";
        Flags += EscapedArg;
      }
      auto FlagsArgString = Args.MakeArgString(Flags);
      if (TC.UseDwarfDebugFlags() || GRecordSwitches) {
        CmdArgs.push_back("-dwarf-debug-flags");
        CmdArgs.push_back(FlagsArgString);
      }
      if (FRecordSwitches) {
        CmdArgs.push_back("-record-command-line");
        CmdArgs.push_back(FlagsArgString);
      }
    }
  
    // Host-side cuda compilation receives all device-side outputs in a single
    // fatbin as Inputs[1]. Include the binary with -fcuda-include-gpubinary.
    if ((IsCuda || IsHIP) && CudaDeviceInput) {
        CmdArgs.push_back("-fcuda-include-gpubinary");
        CmdArgs.push_back(CudaDeviceInput->getFilename());
        if (Args.hasFlag(options::OPT_fgpu_rdc, options::OPT_fno_gpu_rdc, false))
          CmdArgs.push_back("-fgpu-rdc");
    }
  
    if (IsCuda) {
      if (Args.hasFlag(options::OPT_fcuda_short_ptr,
                       options::OPT_fno_cuda_short_ptr, false))
        CmdArgs.push_back("-fcuda-short-ptr");
    }
  
    if (IsCuda || IsHIP) {
      // Determine the original source input.
      const Action *SourceAction = &JA;
      while (SourceAction->getKind() != Action::InputClass) {
        assert(!SourceAction->getInputs().empty() && "unexpected root action!");
        SourceAction = SourceAction->getInputs()[0];
      }
      auto CUID = cast<InputAction>(SourceAction)->getId();
      if (!CUID.empty())
        CmdArgs.push_back(Args.MakeArgString(Twine("-cuid=") + Twine(CUID)));
    }
  
    if (IsHIP)
      CmdArgs.push_back("-fcuda-allow-variadic-functions");
  
    if (IsCudaDevice || IsHIPDevice) {
      StringRef InlineThresh =
          Args.getLastArgValue(options::OPT_fgpu_inline_threshold_EQ);
      if (!InlineThresh.empty()) {
        std::string ArgStr =
            std::string("-inline-threshold=") + InlineThresh.str();
        CmdArgs.append({"-mllvm", Args.MakeArgStringRef(ArgStr)});
      }
    }
  
    // OpenMP offloading device jobs take the argument -fopenmp-host-ir-file-path
    // to specify the result of the compile phase on the host, so the meaningful
    // device declarations can be identified. Also, -fopenmp-is-device is passed
    // along to tell the frontend that it is generating code for a device, so that
    // only the relevant declarations are emitted.
    if (IsOpenMPDevice) {
      CmdArgs.push_back("-fopenmp-is-device");
      if (OpenMPDeviceInput) {
        CmdArgs.push_back("-fopenmp-host-ir-file-path");
        CmdArgs.push_back(Args.MakeArgString(OpenMPDeviceInput->getFilename()));
      }
    }
  
    if (Triple.isAMDGPU()) {
      handleAMDGPUCodeObjectVersionOptions(D, Args, CmdArgs);
  
      if (Args.hasFlag(options::OPT_munsafe_fp_atomics,
                       options::OPT_mno_unsafe_fp_atomics, /*Default=*/false))
        CmdArgs.push_back("-munsafe-fp-atomics");
    }
  
    // For all the host OpenMP offloading compile jobs we need to pass the targets
    // information using -fopenmp-targets= option.
    if (JA.isHostOffloading(Action::OFK_OpenMP)) {
      SmallString<128> TargetInfo("-fopenmp-targets=");
  
      Arg *Tgts = Args.getLastArg(options::OPT_fopenmp_targets_EQ);
      assert(Tgts && Tgts->getNumValues() &&
             "OpenMP offloading has to have targets specified.");
      for (unsigned i = 0; i < Tgts->getNumValues(); ++i) {
        if (i)
          TargetInfo += ',';
        // We need to get the string from the triple because it may be not exactly
        // the same as the one we get directly from the arguments.
        llvm::Triple T(Tgts->getValue(i));
        TargetInfo += T.getTriple();
      }
      CmdArgs.push_back(Args.MakeArgString(TargetInfo.str()));
    }
  
    bool VirtualFunctionElimination =
        Args.hasFlag(options::OPT_fvirtual_function_elimination,
                     options::OPT_fno_virtual_function_elimination, false);
    if (VirtualFunctionElimination) {
      // VFE requires full LTO (currently, this might be relaxed to allow ThinLTO
      // in the future).
      if (LTOMode != LTOK_Full)
        D.Diag(diag::err_drv_argument_only_allowed_with)
            << "-fvirtual-function-elimination"
            << "-flto=full";
  
      CmdArgs.push_back("-fvirtual-function-elimination");
    }
  
    // VFE requires whole-program-vtables, and enables it by default.
    bool WholeProgramVTables = Args.hasFlag(
        options::OPT_fwhole_program_vtables,
        options::OPT_fno_whole_program_vtables, VirtualFunctionElimination);
    if (VirtualFunctionElimination && !WholeProgramVTables) {
      D.Diag(diag::err_drv_argument_not_allowed_with)
          << "-fno-whole-program-vtables"
          << "-fvirtual-function-elimination";
    }
  
    if (WholeProgramVTables) {
      // Propagate -fwhole-program-vtables if this is an LTO compile.
      if (IsUsingLTO)
        CmdArgs.push_back("-fwhole-program-vtables");
      // Check if we passed LTO options but they were suppressed because this is a
      // device offloading action, or we passed device offload LTO options which
      // were suppressed because this is not the device offload action.
      // Otherwise, issue an error.
      else if (!D.isUsingLTO(!IsDeviceOffloadAction))
        D.Diag(diag::err_drv_argument_only_allowed_with)
            << "-fwhole-program-vtables"
            << "-flto";
    }
  
    bool DefaultsSplitLTOUnit =
        (WholeProgramVTables || Sanitize.needsLTO()) &&
        (LTOMode == LTOK_Full || TC.canSplitThinLTOUnit());
    bool SplitLTOUnit =
        Args.hasFlag(options::OPT_fsplit_lto_unit,
                     options::OPT_fno_split_lto_unit, DefaultsSplitLTOUnit);
    if (Sanitize.needsLTO() && !SplitLTOUnit)
      D.Diag(diag::err_drv_argument_not_allowed_with) << "-fno-split-lto-unit"
                                                      << "-fsanitize=cfi";
    if (SplitLTOUnit)
      CmdArgs.push_back("-fsplit-lto-unit");
  
    if (Arg *A = Args.getLastArg(options::OPT_fglobal_isel,
                                 options::OPT_fno_global_isel)) {
      CmdArgs.push_back("-mllvm");
      if (A->getOption().matches(options::OPT_fglobal_isel)) {
        CmdArgs.push_back("-global-isel=1");
  
        // GISel is on by default on AArch64 -O0, so don't bother adding
        // the fallback remarks for it. Other combinations will add a warning of
        // some kind.
        bool IsArchSupported = Triple.getArch() == llvm::Triple::aarch64;
        bool IsOptLevelSupported = false;
  
        Arg *A = Args.getLastArg(options::OPT_O_Group);
        if (Triple.getArch() == llvm::Triple::aarch64) {
          if (!A || A->getOption().matches(options::OPT_O0))
            IsOptLevelSupported = true;
        }
        if (!IsArchSupported || !IsOptLevelSupported) {
          CmdArgs.push_back("-mllvm");
          CmdArgs.push_back("-global-isel-abort=2");
  
          if (!IsArchSupported)
            D.Diag(diag::warn_drv_global_isel_incomplete) << Triple.getArchName();
          else
            D.Diag(diag::warn_drv_global_isel_incomplete_opt);
        }
      } else {
        CmdArgs.push_back("-global-isel=0");
      }
    }
  
    if (Args.hasArg(options::OPT_forder_file_instrumentation)) {
       CmdArgs.push_back("-forder-file-instrumentation");
       // Enable order file instrumentation when ThinLTO is not on. When ThinLTO is
       // on, we need to pass these flags as linker flags and that will be handled
       // outside of the compiler.
       if (!IsUsingLTO) {
         CmdArgs.push_back("-mllvm");
         CmdArgs.push_back("-enable-order-file-instrumentation");
       }
    }
  
    if (Arg *A = Args.getLastArg(options::OPT_fforce_enable_int128,
                                 options::OPT_fno_force_enable_int128)) {
      if (A->getOption().matches(options::OPT_fforce_enable_int128))
        CmdArgs.push_back("-fforce-enable-int128");
    }
  
    if (Args.hasFlag(options::OPT_fkeep_static_consts,
                     options::OPT_fno_keep_static_consts, false))
      CmdArgs.push_back("-fkeep-static-consts");
  
    if (Args.hasFlag(options::OPT_fcomplete_member_pointers,
                     options::OPT_fno_complete_member_pointers, false))
      CmdArgs.push_back("-fcomplete-member-pointers");
  
    if (!Args.hasFlag(options::OPT_fcxx_static_destructors,
                      options::OPT_fno_cxx_static_destructors, true))
      CmdArgs.push_back("-fno-c++-static-destructors");
  
    addMachineOutlinerArgs(D, Args, CmdArgs, Triple, /*IsLTO=*/false);
  
    if (Arg *A = Args.getLastArg(options::OPT_moutline_atomics,
                                 options::OPT_mno_outline_atomics)) {
      if (A->getOption().matches(options::OPT_moutline_atomics)) {
        // Option -moutline-atomics supported for AArch64 target only.
        if (!Triple.isAArch64()) {
          D.Diag(diag::warn_drv_moutline_atomics_unsupported_opt)
              << Triple.getArchName();
        } else {
          CmdArgs.push_back("-target-feature");
          CmdArgs.push_back("+outline-atomics");
        }
      } else {
        CmdArgs.push_back("-target-feature");
        CmdArgs.push_back("-outline-atomics");
      }
    } else if (Triple.isAArch64() &&
               getToolChain().IsAArch64OutlineAtomicsDefault(Args)) {
      CmdArgs.push_back("-target-feature");
      CmdArgs.push_back("+outline-atomics");
    }
  
    if (Args.hasFlag(options::OPT_faddrsig, options::OPT_fno_addrsig,
                     (TC.getTriple().isOSBinFormatELF() ||
                      TC.getTriple().isOSBinFormatCOFF()) &&
                         !TC.getTriple().isPS4() && !TC.getTriple().isVE() &&
                         !TC.getTriple().isOSNetBSD() &&
                         !Distro(D.getVFS(), TC.getTriple()).IsGentoo() &&
                         !TC.getTriple().isAndroid() && TC.useIntegratedAs()))
      CmdArgs.push_back("-faddrsig");
  
    if ((Triple.isOSBinFormatELF() || Triple.isOSBinFormatMachO()) &&
        (EH || UnwindTables || DebugInfoKind != codegenoptions::NoDebugInfo))
      CmdArgs.push_back("-D__GCC_HAVE_DWARF2_CFI_ASM=1");
  
    if (Arg *A = Args.getLastArg(options::OPT_fsymbol_partition_EQ)) {
      std::string Str = A->getAsString(Args);
      if (!TC.getTriple().isOSBinFormatELF())
        D.Diag(diag::err_drv_unsupported_opt_for_target)
            << Str << TC.getTripleString();
      CmdArgs.push_back(Args.MakeArgString(Str));
    }
  
    // Add the "-o out -x type src.c" flags last. This is done primarily to make
    // the -cc1 command easier to edit when reproducing compiler crashes.
    if (Output.getType() == types::TY_Dependencies) {
      // Handled with other dependency code.
    } else if (Output.isFilename()) {
      if (Output.getType() == clang::driver::types::TY_IFS_CPP ||
          Output.getType() == clang::driver::types::TY_IFS) {
        SmallString<128> OutputFilename(Output.getFilename());
        llvm::sys::path::replace_extension(OutputFilename, "ifs");
        CmdArgs.push_back("-o");
        CmdArgs.push_back(Args.MakeArgString(OutputFilename));
      } else {
        CmdArgs.push_back("-o");
        CmdArgs.push_back(Output.getFilename());
      }
    } else {
      assert(Output.isNothing() && "Invalid output.");
    }
  
    addDashXForInput(Args, Input, CmdArgs);
  
    ArrayRef<InputInfo> FrontendInputs = Input;
    if (IsHeaderModulePrecompile)
      FrontendInputs = ModuleHeaderInputs;
    else if (Input.isNothing())
      FrontendInputs = {};
  
    for (const InputInfo &Input : FrontendInputs) {
      if (Input.isFilename())
        CmdArgs.push_back(Input.getFilename());
      else
        Input.getInputArg().renderAsInput(Args, CmdArgs);
    }
  
    if (D.CC1Main && !D.CCGenDiagnostics) {
      // Invoke the CC1 directly in this process
      C.addCommand(std::make_unique<CC1Command>(JA, *this,
                                                ResponseFileSupport::AtFileUTF8(),
                                                Exec, CmdArgs, Inputs, Output));
    } else {
      C.addCommand(std::make_unique<Command>(JA, *this,
                                             ResponseFileSupport::AtFileUTF8(),
                                             Exec, CmdArgs, Inputs, Output));
    }
  
    // Make the compile command echo its inputs for /showFilenames.
    if (Output.getType() == types::TY_Object &&
        Args.hasFlag(options::OPT__SLASH_showFilenames,
                     options::OPT__SLASH_showFilenames_, false)) {
      C.getJobs().getJobs().back()->PrintInputFilenames = true;
    }
  
    if (Arg *A = Args.getLastArg(options::OPT_pg))
      if (FPKeepKind == CodeGenOptions::FramePointerKind::None &&
          !Args.hasArg(options::OPT_mfentry))
        D.Diag(diag::err_drv_argument_not_allowed_with) << "-fomit-frame-pointer"
                                                        << A->getAsString(Args);
  
    // Claim some arguments which clang supports automatically.
  
    // -fpch-preprocess is used with gcc to add a special marker in the output to
    // include the PCH file.
    Args.ClaimAllArgs(options::OPT_fpch_preprocess);
  
    // Claim some arguments which clang doesn't support, but we don't
    // care to warn the user about.
    Args.ClaimAllArgs(options::OPT_clang_ignored_f_Group);
    Args.ClaimAllArgs(options::OPT_clang_ignored_m_Group);
  
    // Disable warnings for clang -E -emit-llvm foo.c
    Args.ClaimAllArgs(options::OPT_emit_llvm);
  }
  
  Clang::Clang(const ToolChain &TC)
      // CAUTION! The first constructor argument ("clang") is not arbitrary,
      // as it is for other tools. Some operations on a Tool actually test
      // whether that tool is Clang based on the Tool's Name as a string.
      : Tool("clang", "clang frontend", TC) {}
  
  Clang::~Clang() {}
  
  /// Add options related to the Objective-C runtime/ABI.
  ///
  /// Returns true if the runtime is non-fragile.
  ObjCRuntime Clang::AddObjCRuntimeArgs(const ArgList &args,
                                        const InputInfoList &inputs,
                                        ArgStringList &cmdArgs,
                                        RewriteKind rewriteKind) const {
    // Look for the controlling runtime option.
    Arg *runtimeArg =
        args.getLastArg(options::OPT_fnext_runtime, options::OPT_fgnu_runtime,
                        options::OPT_fobjc_runtime_EQ);
  
    // Just forward -fobjc-runtime= to the frontend.  This supercedes
    // options about fragility.
    if (runtimeArg &&
        runtimeArg->getOption().matches(options::OPT_fobjc_runtime_EQ)) {
      ObjCRuntime runtime;
      StringRef value = runtimeArg->getValue();
      if (runtime.tryParse(value)) {
        getToolChain().getDriver().Diag(diag::err_drv_unknown_objc_runtime)
            << value;
      }
      if ((runtime.getKind() == ObjCRuntime::GNUstep) &&
          (runtime.getVersion() >= VersionTuple(2, 0)))
        if (!getToolChain().getTriple().isOSBinFormatELF() &&
            !getToolChain().getTriple().isOSBinFormatCOFF()) {
          getToolChain().getDriver().Diag(
              diag::err_drv_gnustep_objc_runtime_incompatible_binary)
            << runtime.getVersion().getMajor();
        }
  
      runtimeArg->render(args, cmdArgs);
      return runtime;
    }
  
    // Otherwise, we'll need the ABI "version".  Version numbers are
    // slightly confusing for historical reasons:
    //   1 - Traditional "fragile" ABI
    //   2 - Non-fragile ABI, version 1
    //   3 - Non-fragile ABI, version 2
    unsigned objcABIVersion = 1;
    // If -fobjc-abi-version= is present, use that to set the version.
    if (Arg *abiArg = args.getLastArg(options::OPT_fobjc_abi_version_EQ)) {
      StringRef value = abiArg->getValue();
      if (value == "1")
        objcABIVersion = 1;
      else if (value == "2")
        objcABIVersion = 2;
      else if (value == "3")
        objcABIVersion = 3;
      else
        getToolChain().getDriver().Diag(diag::err_drv_clang_unsupported) << value;
    } else {
      // Otherwise, determine if we are using the non-fragile ABI.
      bool nonFragileABIIsDefault =
          (rewriteKind == RK_NonFragile ||
           (rewriteKind == RK_None &&
            getToolChain().IsObjCNonFragileABIDefault()));
      if (args.hasFlag(options::OPT_fobjc_nonfragile_abi,
                       options::OPT_fno_objc_nonfragile_abi,
                       nonFragileABIIsDefault)) {
  // Determine the non-fragile ABI version to use.
  #ifdef DISABLE_DEFAULT_NONFRAGILEABI_TWO
        unsigned nonFragileABIVersion = 1;
  #else
        unsigned nonFragileABIVersion = 2;
  #endif
  
        if (Arg *abiArg =
                args.getLastArg(options::OPT_fobjc_nonfragile_abi_version_EQ)) {
          StringRef value = abiArg->getValue();
          if (value == "1")
            nonFragileABIVersion = 1;
          else if (value == "2")
            nonFragileABIVersion = 2;
          else
            getToolChain().getDriver().Diag(diag::err_drv_clang_unsupported)
                << value;
        }
  
        objcABIVersion = 1 + nonFragileABIVersion;
      } else {
        objcABIVersion = 1;
      }
    }
  
    // We don't actually care about the ABI version other than whether
    // it's non-fragile.
    bool isNonFragile = objcABIVersion != 1;
  
    // If we have no runtime argument, ask the toolchain for its default runtime.
    // However, the rewriter only really supports the Mac runtime, so assume that.
    ObjCRuntime runtime;
    if (!runtimeArg) {
      switch (rewriteKind) {
      case RK_None:
        runtime = getToolChain().getDefaultObjCRuntime(isNonFragile);
        break;
      case RK_Fragile:
        runtime = ObjCRuntime(ObjCRuntime::FragileMacOSX, VersionTuple());
        break;
      case RK_NonFragile:
        runtime = ObjCRuntime(ObjCRuntime::MacOSX, VersionTuple());
        break;
      }
  
      // -fnext-runtime
    } else if (runtimeArg->getOption().matches(options::OPT_fnext_runtime)) {
      // On Darwin, make this use the default behavior for the toolchain.
      if (getToolChain().getTriple().isOSDarwin()) {
        runtime = getToolChain().getDefaultObjCRuntime(isNonFragile);
  
        // Otherwise, build for a generic macosx port.
      } else {
        runtime = ObjCRuntime(ObjCRuntime::MacOSX, VersionTuple());
      }
  
      // -fgnu-runtime
    } else {
      assert(runtimeArg->getOption().matches(options::OPT_fgnu_runtime));
      // Legacy behaviour is to target the gnustep runtime if we are in
      // non-fragile mode or the GCC runtime in fragile mode.
      if (isNonFragile)
        runtime = ObjCRuntime(ObjCRuntime::GNUstep, VersionTuple(2, 0));
      else
        runtime = ObjCRuntime(ObjCRuntime::GCC, VersionTuple());
    }
  
    if (llvm::any_of(inputs, [](const InputInfo &input) {
          return types::isObjC(input.getType());
        }))
      cmdArgs.push_back(
          args.MakeArgString("-fobjc-runtime=" + runtime.getAsString()));
    return runtime;
  }
  
  static bool maybeConsumeDash(const std::string &EH, size_t &I) {
    bool HaveDash = (I + 1 < EH.size() && EH[I + 1] == '-');
    I += HaveDash;
    return !HaveDash;
  }
  
  namespace {
  struct EHFlags {
    bool Synch = false;
    bool Asynch = false;
    bool NoUnwindC = false;
  };
  } // end anonymous namespace
  
  /// /EH controls whether to run destructor cleanups when exceptions are
  /// thrown.  There are three modifiers:
  /// - s: Cleanup after "synchronous" exceptions, aka C++ exceptions.
  /// - a: Cleanup after "asynchronous" exceptions, aka structured exceptions.
  ///      The 'a' modifier is unimplemented and fundamentally hard in LLVM IR.
  /// - c: Assume that extern "C" functions are implicitly nounwind.
  /// The default is /EHs-c-, meaning cleanups are disabled.
  static EHFlags parseClangCLEHFlags(const Driver &D, const ArgList &Args) {
    EHFlags EH;
  
    std::vector<std::string> EHArgs =
        Args.getAllArgValues(options::OPT__SLASH_EH);
    for (auto EHVal : EHArgs) {
      for (size_t I = 0, E = EHVal.size(); I != E; ++I) {
        switch (EHVal[I]) {
        case 'a':
          EH.Asynch = maybeConsumeDash(EHVal, I);
          if (EH.Asynch)
            EH.Synch = false;
          continue;
        case 'c':
          EH.NoUnwindC = maybeConsumeDash(EHVal, I);
          continue;
        case 's':
          EH.Synch = maybeConsumeDash(EHVal, I);
          if (EH.Synch)
            EH.Asynch = false;
          continue;
        default:
          break;
        }
        D.Diag(clang::diag::err_drv_invalid_value) << "/EH" << EHVal;
        break;
      }
    }
    // The /GX, /GX- flags are only processed if there are not /EH flags.
    // The default is that /GX is not specified.
    if (EHArgs.empty() &&
        Args.hasFlag(options::OPT__SLASH_GX, options::OPT__SLASH_GX_,
                     /*Default=*/false)) {
      EH.Synch = true;
      EH.NoUnwindC = true;
    }
  
    return EH;
  }
  
  void Clang::AddClangCLArgs(const ArgList &Args, types::ID InputType,
                             ArgStringList &CmdArgs,
                             codegenoptions::DebugInfoKind *DebugInfoKind,
                             bool *EmitCodeView) const {
    unsigned RTOptionID = options::OPT__SLASH_MT;
    bool isNVPTX = getToolChain().getTriple().isNVPTX();
  
    if (Args.hasArg(options::OPT__SLASH_LDd))
      // The /LDd option implies /MTd. The dependent lib part can be overridden,
      // but defining _DEBUG is sticky.
      RTOptionID = options::OPT__SLASH_MTd;
  
    if (Arg *A = Args.getLastArg(options::OPT__SLASH_M_Group))
      RTOptionID = A->getOption().getID();
  
    StringRef FlagForCRT;
    switch (RTOptionID) {
    case options::OPT__SLASH_MD:
      if (Args.hasArg(options::OPT__SLASH_LDd))
        CmdArgs.push_back("-D_DEBUG");
      CmdArgs.push_back("-D_MT");
      CmdArgs.push_back("-D_DLL");
      FlagForCRT = "--dependent-lib=msvcrt";
      break;
    case options::OPT__SLASH_MDd:
      CmdArgs.push_back("-D_DEBUG");
      CmdArgs.push_back("-D_MT");
      CmdArgs.push_back("-D_DLL");
      FlagForCRT = "--dependent-lib=msvcrtd";
      break;
    case options::OPT__SLASH_MT:
      if (Args.hasArg(options::OPT__SLASH_LDd))
        CmdArgs.push_back("-D_DEBUG");
      CmdArgs.push_back("-D_MT");
      CmdArgs.push_back("-flto-visibility-public-std");
      FlagForCRT = "--dependent-lib=libcmt";
      break;
    case options::OPT__SLASH_MTd:
      CmdArgs.push_back("-D_DEBUG");
      CmdArgs.push_back("-D_MT");
      CmdArgs.push_back("-flto-visibility-public-std");
      FlagForCRT = "--dependent-lib=libcmtd";
      break;
    default:
      llvm_unreachable("Unexpected option ID.");
    }
  
    if (Args.hasArg(options::OPT__SLASH_Zl)) {
      CmdArgs.push_back("-D_VC_NODEFAULTLIB");
    } else {
      CmdArgs.push_back(FlagForCRT.data());
  
      // This provides POSIX compatibility (maps 'open' to '_open'), which most
      // users want.  The /Za flag to cl.exe turns this off, but it's not
      // implemented in clang.
      CmdArgs.push_back("--dependent-lib=oldnames");
    }
  
    if (Arg *ShowIncludes =
            Args.getLastArg(options::OPT__SLASH_showIncludes,
                            options::OPT__SLASH_showIncludes_user)) {
      CmdArgs.push_back("--show-includes");
      if (ShowIncludes->getOption().matches(options::OPT__SLASH_showIncludes))
        CmdArgs.push_back("-sys-header-deps");
    }
  
    // This controls whether or not we emit RTTI data for polymorphic types.
    if (Args.hasFlag(options::OPT__SLASH_GR_, options::OPT__SLASH_GR,
                     /*Default=*/false))
      CmdArgs.push_back("-fno-rtti-data");
  
    // This controls whether or not we emit stack-protector instrumentation.
    // In MSVC, Buffer Security Check (/GS) is on by default.
    if (!isNVPTX && Args.hasFlag(options::OPT__SLASH_GS, options::OPT__SLASH_GS_,
                                 /*Default=*/true)) {
      CmdArgs.push_back("-stack-protector");
      CmdArgs.push_back(Args.MakeArgString(Twine(LangOptions::SSPStrong)));
    }
  
    // Emit CodeView if -Z7 or -gline-tables-only are present.
    if (Arg *DebugInfoArg = Args.getLastArg(options::OPT__SLASH_Z7,
                                            options::OPT_gline_tables_only)) {
      *EmitCodeView = true;
      if (DebugInfoArg->getOption().matches(options::OPT__SLASH_Z7))
        *DebugInfoKind = codegenoptions::LimitedDebugInfo;
      else
        *DebugInfoKind = codegenoptions::DebugLineTablesOnly;
    } else {
      *EmitCodeView = false;
    }
  
    const Driver &D = getToolChain().getDriver();
    EHFlags EH = parseClangCLEHFlags(D, Args);
    if (!isNVPTX && (EH.Synch || EH.Asynch)) {
      if (types::isCXX(InputType))
        CmdArgs.push_back("-fcxx-exceptions");
      CmdArgs.push_back("-fexceptions");
    }
    if (types::isCXX(InputType) && EH.Synch && EH.NoUnwindC)
      CmdArgs.push_back("-fexternc-nounwind");
  
    // /EP should expand to -E -P.
    if (Args.hasArg(options::OPT__SLASH_EP)) {
      CmdArgs.push_back("-E");
      CmdArgs.push_back("-P");
    }
  
    unsigned VolatileOptionID;
    if (getToolChain().getTriple().isX86())
      VolatileOptionID = options::OPT__SLASH_volatile_ms;
    else
      VolatileOptionID = options::OPT__SLASH_volatile_iso;
  
    if (Arg *A = Args.getLastArg(options::OPT__SLASH_volatile_Group))
      VolatileOptionID = A->getOption().getID();
  
    if (VolatileOptionID == options::OPT__SLASH_volatile_ms)
      CmdArgs.push_back("-fms-volatile");
  
   if (Args.hasFlag(options::OPT__SLASH_Zc_dllexportInlines_,
                    options::OPT__SLASH_Zc_dllexportInlines,
                    false)) {
    CmdArgs.push_back("-fno-dllexport-inlines");
   }
  
    Arg *MostGeneralArg = Args.getLastArg(options::OPT__SLASH_vmg);
    Arg *BestCaseArg = Args.getLastArg(options::OPT__SLASH_vmb);
    if (MostGeneralArg && BestCaseArg)
      D.Diag(clang::diag::err_drv_argument_not_allowed_with)
          << MostGeneralArg->getAsString(Args) << BestCaseArg->getAsString(Args);
  
    if (MostGeneralArg) {
      Arg *SingleArg = Args.getLastArg(options::OPT__SLASH_vms);
      Arg *MultipleArg = Args.getLastArg(options::OPT__SLASH_vmm);
      Arg *VirtualArg = Args.getLastArg(options::OPT__SLASH_vmv);
  
      Arg *FirstConflict = SingleArg ? SingleArg : MultipleArg;
      Arg *SecondConflict = VirtualArg ? VirtualArg : MultipleArg;
      if (FirstConflict && SecondConflict && FirstConflict != SecondConflict)
        D.Diag(clang::diag::err_drv_argument_not_allowed_with)
            << FirstConflict->getAsString(Args)
            << SecondConflict->getAsString(Args);
  
      if (SingleArg)
        CmdArgs.push_back("-fms-memptr-rep=single");
      else if (MultipleArg)
        CmdArgs.push_back("-fms-memptr-rep=multiple");
      else
        CmdArgs.push_back("-fms-memptr-rep=virtual");
    }
  
    // Parse the default calling convention options.
    if (Arg *CCArg =
            Args.getLastArg(options::OPT__SLASH_Gd, options::OPT__SLASH_Gr,
                            options::OPT__SLASH_Gz, options::OPT__SLASH_Gv,
                            options::OPT__SLASH_Gregcall)) {
      unsigned DCCOptId = CCArg->getOption().getID();
      const char *DCCFlag = nullptr;
      bool ArchSupported = !isNVPTX;
      llvm::Triple::ArchType Arch = getToolChain().getArch();
      switch (DCCOptId) {
      case options::OPT__SLASH_Gd:
        DCCFlag = "-fdefault-calling-conv=cdecl";
        break;
      case options::OPT__SLASH_Gr:
        ArchSupported = Arch == llvm::Triple::x86;
        DCCFlag = "-fdefault-calling-conv=fastcall";
        break;
      case options::OPT__SLASH_Gz:
        ArchSupported = Arch == llvm::Triple::x86;
        DCCFlag = "-fdefault-calling-conv=stdcall";
        break;
      case options::OPT__SLASH_Gv:
        ArchSupported = Arch == llvm::Triple::x86 || Arch == llvm::Triple::x86_64;
        DCCFlag = "-fdefault-calling-conv=vectorcall";
        break;
      case options::OPT__SLASH_Gregcall:
        ArchSupported = Arch == llvm::Triple::x86 || Arch == llvm::Triple::x86_64;
        DCCFlag = "-fdefault-calling-conv=regcall";
        break;
      }
  
      // MSVC doesn't warn if /Gr or /Gz is used on x64, so we don't either.
      if (ArchSupported && DCCFlag)
        CmdArgs.push_back(DCCFlag);
    }
  
    Args.AddLastArg(CmdArgs, options::OPT_vtordisp_mode_EQ);
  
    if (!Args.hasArg(options::OPT_fdiagnostics_format_EQ)) {
      CmdArgs.push_back("-fdiagnostics-format");
      CmdArgs.push_back("msvc");
    }
  
    if (Arg *A = Args.getLastArg(options::OPT__SLASH_guard)) {
      StringRef GuardArgs = A->getValue();
      // The only valid options are "cf", "cf,nochecks", "cf-", "ehcont" and
      // "ehcont-".
      if (GuardArgs.equals_insensitive("cf")) {
        // Emit CFG instrumentation and the table of address-taken functions.
        CmdArgs.push_back("-cfguard");
      } else if (GuardArgs.equals_insensitive("cf,nochecks")) {
        // Emit only the table of address-taken functions.
        CmdArgs.push_back("-cfguard-no-checks");
      } else if (GuardArgs.equals_insensitive("ehcont")) {
        // Emit EH continuation table.
        CmdArgs.push_back("-ehcontguard");
      } else if (GuardArgs.equals_insensitive("cf-") ||
                 GuardArgs.equals_insensitive("ehcont-")) {
        // Do nothing, but we might want to emit a security warning in future.
      } else {
        D.Diag(diag::err_drv_invalid_value) << A->getSpelling() << GuardArgs;
      }
    }
  }
  
  const char *Clang::getBaseInputName(const ArgList &Args,
                                      const InputInfo &Input) {
    return Args.MakeArgString(llvm::sys::path::filename(Input.getBaseInput()));
  }
  
  const char *Clang::getBaseInputStem(const ArgList &Args,
                                      const InputInfoList &Inputs) {
    const char *Str = getBaseInputName(Args, Inputs[0]);
  
    if (const char *End = strrchr(Str, '.'))
      return Args.MakeArgString(std::string(Str, End));
  
    return Str;
  }
  
  const char *Clang::getDependencyFileName(const ArgList &Args,
                                           const InputInfoList &Inputs) {
    // FIXME: Think about this more.
  
    if (Arg *OutputOpt = Args.getLastArg(options::OPT_o)) {
      SmallString<128> OutputFilename(OutputOpt->getValue());
      llvm::sys::path::replace_extension(OutputFilename, llvm::Twine('d'));
      return Args.MakeArgString(OutputFilename);
    }
  
    return Args.MakeArgString(Twine(getBaseInputStem(Args, Inputs)) + ".d");
  }
  
  // Begin ClangAs
  
  void ClangAs::AddMIPSTargetArgs(const ArgList &Args,
                                  ArgStringList &CmdArgs) const {
    StringRef CPUName;
    StringRef ABIName;
    const llvm::Triple &Triple = getToolChain().getTriple();
    mips::getMipsCPUAndABI(Args, Triple, CPUName, ABIName);
  
    CmdArgs.push_back("-target-abi");
    CmdArgs.push_back(ABIName.data());
  }
  
  void ClangAs::AddX86TargetArgs(const ArgList &Args,
                                 ArgStringList &CmdArgs) const {
    addX86AlignBranchArgs(getToolChain().getDriver(), Args, CmdArgs,
                          /*IsLTO=*/false);
  
    if (Arg *A = Args.getLastArg(options::OPT_masm_EQ)) {
      StringRef Value = A->getValue();
      if (Value == "intel" || Value == "att") {
        CmdArgs.push_back("-mllvm");
        CmdArgs.push_back(Args.MakeArgString("-x86-asm-syntax=" + Value));
      } else {
        getToolChain().getDriver().Diag(diag::err_drv_unsupported_option_argument)
            << A->getOption().getName() << Value;
      }
    }
  }
  
  void ClangAs::AddRISCVTargetArgs(const ArgList &Args,
                                 ArgStringList &CmdArgs) const {
    const llvm::Triple &Triple = getToolChain().getTriple();
    StringRef ABIName = riscv::getRISCVABI(Args, Triple);
  
    CmdArgs.push_back("-target-abi");
    CmdArgs.push_back(ABIName.data());
  }
  
  void ClangAs::ConstructJob(Compilation &C, const JobAction &JA,
                             const InputInfo &Output, const InputInfoList &Inputs,
                             const ArgList &Args,
                             const char *LinkingOutput) const {
    ArgStringList CmdArgs;
  
    assert(Inputs.size() == 1 && "Unexpected number of inputs.");
    const InputInfo &Input = Inputs[0];
  
    const llvm::Triple &Triple = getToolChain().getEffectiveTriple();
    const std::string &TripleStr = Triple.getTriple();
    const auto &D = getToolChain().getDriver();
  
    // Don't warn about "clang -w -c foo.s"
    Args.ClaimAllArgs(options::OPT_w);
    // and "clang -emit-llvm -c foo.s"
    Args.ClaimAllArgs(options::OPT_emit_llvm);
  
    claimNoWarnArgs(Args);
  
    // Invoke ourselves in -cc1as mode.
    //
    // FIXME: Implement custom jobs for internal actions.
    CmdArgs.push_back("-cc1as");
  
    // Add the "effective" target triple.
    CmdArgs.push_back("-triple");
    CmdArgs.push_back(Args.MakeArgString(TripleStr));
  
    // Set the output mode, we currently only expect to be used as a real
    // assembler.
    CmdArgs.push_back("-filetype");
    CmdArgs.push_back("obj");
  
    // Set the main file name, so that debug info works even with
    // -save-temps or preprocessed assembly.
    CmdArgs.push_back("-main-file-name");
    CmdArgs.push_back(Clang::getBaseInputName(Args, Input));
  
    // Add the target cpu
    std::string CPU = getCPUName(Args, Triple, /*FromAs*/ true);
    if (!CPU.empty()) {
      CmdArgs.push_back("-target-cpu");
      CmdArgs.push_back(Args.MakeArgString(CPU));
    }
  
    // Add the target features
    getTargetFeatures(D, Triple, Args, CmdArgs, true);
  
    // Ignore explicit -force_cpusubtype_ALL option.
    (void)Args.hasArg(options::OPT_force__cpusubtype__ALL);
  
    // Pass along any -I options so we get proper .include search paths.
    Args.AddAllArgs(CmdArgs, options::OPT_I_Group);
  
    // Determine the original source input.
    const Action *SourceAction = &JA;
    while (SourceAction->getKind() != Action::InputClass) {
      assert(!SourceAction->getInputs().empty() && "unexpected root action!");
      SourceAction = SourceAction->getInputs()[0];
    }
  
    // Forward -g and handle debug info related flags, assuming we are dealing
    // with an actual assembly file.
    bool WantDebug = false;
    Args.ClaimAllArgs(options::OPT_g_Group);
    if (Arg *A = Args.getLastArg(options::OPT_g_Group))
      WantDebug = !A->getOption().matches(options::OPT_g0) &&
                  !A->getOption().matches(options::OPT_ggdb0);
  
    unsigned DwarfVersion = ParseDebugDefaultVersion(getToolChain(), Args);
    if (const Arg *GDwarfN = getDwarfNArg(Args))
      DwarfVersion = DwarfVersionNum(GDwarfN->getSpelling());
  
    if (DwarfVersion == 0)
      DwarfVersion = getToolChain().GetDefaultDwarfVersion();
  
    codegenoptions::DebugInfoKind DebugInfoKind = codegenoptions::NoDebugInfo;
  
    if (SourceAction->getType() == types::TY_Asm ||
        SourceAction->getType() == types::TY_PP_Asm) {
      // You might think that it would be ok to set DebugInfoKind outside of
      // the guard for source type, however there is a test which asserts
      // that some assembler invocation receives no -debug-info-kind,
      // and it's not clear whether that test is just overly restrictive.
      DebugInfoKind = (WantDebug ? codegenoptions::LimitedDebugInfo
                                 : codegenoptions::NoDebugInfo);
      // Add the -fdebug-compilation-dir flag if needed.
      addDebugCompDirArg(Args, CmdArgs, C.getDriver().getVFS());
  
      addDebugPrefixMapArg(getToolChain().getDriver(), Args, CmdArgs);
  
      // Set the AT_producer to the clang version when using the integrated
      // assembler on assembly source files.
      CmdArgs.push_back("-dwarf-debug-producer");
      CmdArgs.push_back(Args.MakeArgString(getClangFullVersion()));
  
      // And pass along -I options
      Args.AddAllArgs(CmdArgs, options::OPT_I);
    }
    RenderDebugEnablingArgs(Args, CmdArgs, DebugInfoKind, DwarfVersion,
                            llvm::DebuggerKind::Default);
    renderDwarfFormat(D, Triple, Args, CmdArgs, DwarfVersion);
    RenderDebugInfoCompressionArgs(Args, CmdArgs, D, getToolChain());
  
  
    // Handle -fPIC et al -- the relocation-model affects the assembler
    // for some targets.
    llvm::Reloc::Model RelocationModel;
    unsigned PICLevel;
    bool IsPIE;
    std::tie(RelocationModel, PICLevel, IsPIE) =
        ParsePICArgs(getToolChain(), Args);
  
    const char *RMName = RelocationModelName(RelocationModel);
    if (RMName) {
      CmdArgs.push_back("-mrelocation-model");
      CmdArgs.push_back(RMName);
    }
  
    // Optionally embed the -cc1as level arguments into the debug info, for build
    // analysis.
    if (getToolChain().UseDwarfDebugFlags()) {
      ArgStringList OriginalArgs;
      for (const auto &Arg : Args)
        Arg->render(Args, OriginalArgs);
  
      SmallString<256> Flags;
      const char *Exec = getToolChain().getDriver().getClangProgramPath();
      EscapeSpacesAndBackslashes(Exec, Flags);
      for (const char *OriginalArg : OriginalArgs) {
        SmallString<128> EscapedArg;
        EscapeSpacesAndBackslashes(OriginalArg, EscapedArg);
        Flags += " ";
        Flags += EscapedArg;
      }
      CmdArgs.push_back("-dwarf-debug-flags");
      CmdArgs.push_back(Args.MakeArgString(Flags));
    }
  
    // FIXME: Add -static support, once we have it.
  
    // Add target specific flags.
    switch (getToolChain().getArch()) {
    default:
      break;
  
    case llvm::Triple::mips:
    case llvm::Triple::mipsel:
    case llvm::Triple::mips64:
    case llvm::Triple::mips64el:
      AddMIPSTargetArgs(Args, CmdArgs);
      break;
  
    case llvm::Triple::x86:
    case llvm::Triple::x86_64:
      AddX86TargetArgs(Args, CmdArgs);
      break;
  
    case llvm::Triple::arm:
    case llvm::Triple::armeb:
    case llvm::Triple::thumb:
    case llvm::Triple::thumbeb:
      // This isn't in AddARMTargetArgs because we want to do this for assembly
      // only, not C/C++.
      if (Args.hasFlag(options::OPT_mdefault_build_attributes,
                       options::OPT_mno_default_build_attributes, true)) {
          CmdArgs.push_back("-mllvm");
          CmdArgs.push_back("-arm-add-build-attributes");
      }
      break;
  
    case llvm::Triple::aarch64:
    case llvm::Triple::aarch64_32:
    case llvm::Triple::aarch64_be:
      if (Args.hasArg(options::OPT_mmark_bti_property)) {
        CmdArgs.push_back("-mllvm");
        CmdArgs.push_back("-aarch64-mark-bti-property");
      }
      break;
  
    case llvm::Triple::riscv32:
    case llvm::Triple::riscv64:
      AddRISCVTargetArgs(Args, CmdArgs);
      break;
    }
  
    // Consume all the warning flags. Usually this would be handled more
    // gracefully by -cc1 (warning about unknown warning flags, etc) but -cc1as
    // doesn't handle that so rather than warning about unused flags that are
    // actually used, we'll lie by omission instead.
    // FIXME: Stop lying and consume only the appropriate driver flags
    Args.ClaimAllArgs(options::OPT_W_Group);
  
    CollectArgsForIntegratedAssembler(C, Args, CmdArgs,
                                      getToolChain().getDriver());
  
    Args.AddAllArgs(CmdArgs, options::OPT_mllvm);
  
    assert(Output.isFilename() && "Unexpected lipo output.");
    CmdArgs.push_back("-o");
    CmdArgs.push_back(Output.getFilename());
  
    const llvm::Triple &T = getToolChain().getTriple();
    Arg *A;
    if (getDebugFissionKind(D, Args, A) == DwarfFissionKind::Split &&
        T.isOSBinFormatELF()) {
      CmdArgs.push_back("-split-dwarf-output");
      CmdArgs.push_back(SplitDebugName(JA, Args, Input, Output));
    }
  
    if (Triple.isAMDGPU())
      handleAMDGPUCodeObjectVersionOptions(D, Args, CmdArgs);
  
    assert(Input.isFilename() && "Invalid input.");
    CmdArgs.push_back(Input.getFilename());
  
    const char *Exec = getToolChain().getDriver().getClangProgramPath();
    if (D.CC1Main && !D.CCGenDiagnostics) {
      // Invoke cc1as directly in this process.
      C.addCommand(std::make_unique<CC1Command>(JA, *this,
                                                ResponseFileSupport::AtFileUTF8(),
                                                Exec, CmdArgs, Inputs, Output));
    } else {
      C.addCommand(std::make_unique<Command>(JA, *this,
                                             ResponseFileSupport::AtFileUTF8(),
                                             Exec, CmdArgs, Inputs, Output));
    }
  }
  
  // Begin OffloadBundler
  
  void OffloadBundler::ConstructJob(Compilation &C, const JobAction &JA,
                                    const InputInfo &Output,
                                    const InputInfoList &Inputs,
                                    const llvm::opt::ArgList &TCArgs,
                                    const char *LinkingOutput) const {
    // The version with only one output is expected to refer to a bundling job.
    assert(isa<OffloadBundlingJobAction>(JA) && "Expecting bundling job!");
  
    // The bundling command looks like this:
    // clang-offload-bundler -type=bc
    //   -targets=host-triple,openmp-triple1,openmp-triple2
    //   -outputs=input_file
    //   -inputs=unbundle_file_host,unbundle_file_tgt1,unbundle_file_tgt2"
  
    ArgStringList CmdArgs;
  
    // Get the type.
    CmdArgs.push_back(TCArgs.MakeArgString(
        Twine("-type=") + types::getTypeTempSuffix(Output.getType())));
  
    assert(JA.getInputs().size() == Inputs.size() &&
           "Not have inputs for all dependence actions??");
  
    // Get the targets.
    SmallString<128> Triples;
    Triples += "-targets=";
    for (unsigned I = 0; I < Inputs.size(); ++I) {
      if (I)
        Triples += ',';
  
      // Find ToolChain for this input.
      Action::OffloadKind CurKind = Action::OFK_Host;
      const ToolChain *CurTC = &getToolChain();
      const Action *CurDep = JA.getInputs()[I];
  
      if (const auto *OA = dyn_cast<OffloadAction>(CurDep)) {
        CurTC = nullptr;
        OA->doOnEachDependence([&](Action *A, const ToolChain *TC, const char *) {
          assert(CurTC == nullptr && "Expected one dependence!");
          CurKind = A->getOffloadingDeviceKind();
          CurTC = TC;
        });
      }
      Triples += Action::GetOffloadKindName(CurKind);
      Triples += "-";
      std::string NormalizedTriple = CurTC->getTriple().normalize();
      Triples += NormalizedTriple;
  
      if (CurDep->getOffloadingArch() != nullptr) {
        // If OffloadArch is present it can only appear as the 6th hypen
        // sepearated field of Bundle Entry ID. So, pad required number of
        // hyphens in Triple.
        for (int i = 4 - StringRef(NormalizedTriple).count("-"); i > 0; i--)
          Triples += "-";
        Triples += CurDep->getOffloadingArch();
      }
    }
    CmdArgs.push_back(TCArgs.MakeArgString(Triples));
  
    // Get bundled file command.
    CmdArgs.push_back(
        TCArgs.MakeArgString(Twine("-outputs=") + Output.getFilename()));
  
    // Get unbundled files command.
    SmallString<128> UB;
    UB += "-inputs=";
    for (unsigned I = 0; I < Inputs.size(); ++I) {
      if (I)
        UB += ',';
  
      // Find ToolChain for this input.
      const ToolChain *CurTC = &getToolChain();
      if (const auto *OA = dyn_cast<OffloadAction>(JA.getInputs()[I])) {
        CurTC = nullptr;
        OA->doOnEachDependence([&](Action *, const ToolChain *TC, const char *) {
          assert(CurTC == nullptr && "Expected one dependence!");
          CurTC = TC;
        });
      }
      UB += CurTC->getInputFilename(Inputs[I]);
    }
    CmdArgs.push_back(TCArgs.MakeArgString(UB));
  
    // All the inputs are encoded as commands.
    C.addCommand(std::make_unique<Command>(
        JA, *this, ResponseFileSupport::None(),
        TCArgs.MakeArgString(getToolChain().GetProgramPath(getShortName())),
        CmdArgs, None, Output));
  }
  
  void OffloadBundler::ConstructJobMultipleOutputs(
      Compilation &C, const JobAction &JA, const InputInfoList &Outputs,
      const InputInfoList &Inputs, const llvm::opt::ArgList &TCArgs,
      const char *LinkingOutput) const {
    // The version with multiple outputs is expected to refer to a unbundling job.
    auto &UA = cast<OffloadUnbundlingJobAction>(JA);
  
    // The unbundling command looks like this:
    // clang-offload-bundler -type=bc
    //   -targets=host-triple,openmp-triple1,openmp-triple2
    //   -inputs=input_file
    //   -outputs=unbundle_file_host,unbundle_file_tgt1,unbundle_file_tgt2"
    //   -unbundle
  
    ArgStringList CmdArgs;
  
    assert(Inputs.size() == 1 && "Expecting to unbundle a single file!");
    InputInfo Input = Inputs.front();
  
    // Get the type.
    CmdArgs.push_back(TCArgs.MakeArgString(
        Twine("-type=") + types::getTypeTempSuffix(Input.getType())));
  
    // Get the targets.
    SmallString<128> Triples;
    Triples += "-targets=";
    auto DepInfo = UA.getDependentActionsInfo();
    for (unsigned I = 0; I < DepInfo.size(); ++I) {
      if (I)
        Triples += ',';
  
      auto &Dep = DepInfo[I];
      Triples += Action::GetOffloadKindName(Dep.DependentOffloadKind);
      Triples += "-";
      std::string NormalizedTriple =
          Dep.DependentToolChain->getTriple().normalize();
      Triples += NormalizedTriple;
  
      if (!Dep.DependentBoundArch.empty()) {
        // If OffloadArch is present it can only appear as the 6th hypen
        // sepearated field of Bundle Entry ID. So, pad required number of
        // hyphens in Triple.
        for (int i = 4 - StringRef(NormalizedTriple).count("-"); i > 0; i--)
          Triples += "-";
        Triples += Dep.DependentBoundArch;
      }
    }
  
    CmdArgs.push_back(TCArgs.MakeArgString(Triples));
  
    // Get bundled file command.
    CmdArgs.push_back(
        TCArgs.MakeArgString(Twine("-inputs=") + Input.getFilename()));
  
    // Get unbundled files command.
    SmallString<128> UB;
    UB += "-outputs=";
    for (unsigned I = 0; I < Outputs.size(); ++I) {
      if (I)
        UB += ',';
      UB += DepInfo[I].DependentToolChain->getInputFilename(Outputs[I]);
    }
    CmdArgs.push_back(TCArgs.MakeArgString(UB));
    CmdArgs.push_back("-unbundle");
    CmdArgs.push_back("-allow-missing-bundles");
  
    // All the inputs are encoded as commands.
    C.addCommand(std::make_unique<Command>(
        JA, *this, ResponseFileSupport::None(),
        TCArgs.MakeArgString(getToolChain().GetProgramPath(getShortName())),
        CmdArgs, None, Outputs));
  }
  
  void OffloadWrapper::ConstructJob(Compilation &C, const JobAction &JA,
                                    const InputInfo &Output,
                                    const InputInfoList &Inputs,
                                    const ArgList &Args,
                                    const char *LinkingOutput) const {
    ArgStringList CmdArgs;
  
    const llvm::Triple &Triple = getToolChain().getEffectiveTriple();
  
    // Add the "effective" target triple.
    CmdArgs.push_back("-target");
    CmdArgs.push_back(Args.MakeArgString(Triple.getTriple()));
  
    // Add the output file name.
    assert(Output.isFilename() && "Invalid output.");
    CmdArgs.push_back("-o");
    CmdArgs.push_back(Output.getFilename());
  
    // Add inputs.
    for (const InputInfo &I : Inputs) {
      assert(I.isFilename() && "Invalid input.");
      CmdArgs.push_back(I.getFilename());
    }
  
    C.addCommand(std::make_unique<Command>(
        JA, *this, ResponseFileSupport::None(),
        Args.MakeArgString(getToolChain().GetProgramPath(getShortName())),
        CmdArgs, Inputs, Output));
  }
  