Clang.cpp

Go to the documentation of this file.

//===-- 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/CSKY.h"
#include "Arch/LoongArch.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 "MSP430.h"
#include "PS4CPU.h"
#include "clang/Basic/CLWarnings.h"
#include "clang/Basic/CharInfo.h"
#include "clang/Basic/CodeGenOptions.h"
#include "clang/Basic/HeaderInclude.h"
#include "clang/Basic/LangOptions.h"
#include "clang/Basic/MakeSupport.h"
#include "clang/Basic/ObjCRuntime.h"
#include "clang/Basic/Version.h"
#include "clang/Config/config.h"
#include "clang/Driver/Action.h"
#include "clang/Driver/Distro.h"
#include "clang/Driver/DriverDiagnostic.h"
#include "clang/Driver/InputInfo.h"
#include "clang/Driver/Options.h"
#include "clang/Driver/SanitizerArgs.h"
#include "clang/Driver/Types.h"
#include "clang/Driver/XRayArgs.h"
#include "llvm/ADT/SmallSet.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/Error.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/Process.h"
#include "llvm/Support/RISCVISAInfo.h"
#include "llvm/Support/YAMLParser.h"
#include "llvm/TargetParser/ARMTargetParserCommon.h"
#include "llvm/TargetParser/Host.h"
#include "llvm/TargetParser/LoongArchTargetParser.h"
#include "llvm/TargetParser/RISCVTargetParser.h"
#include <cctype>
 
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,
                               options::OPT_fminimize_whitespace,
                               options::OPT_fno_minimize_whitespace)) {
    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);
  }
}
 
/// 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("divh", false));
  OptionStrings.insert(std::make_pair("vec-divd", false));
  OptionStrings.insert(std::make_pair("vec-divf", false));
  OptionStrings.insert(std::make_pair("vec-divh", false));
  OptionStrings.insert(std::make_pair("sqrtd", false));
  OptionStrings.insert(std::make_pair("sqrtf", false));
  OptionStrings.insert(std::make_pair("sqrth", false));
  OptionStrings.insert(std::make_pair("vec-sqrtd", false));
  OptionStrings.insert(std::make_pair("vec-sqrtf", false));
  OptionStrings.insert(std::make_pair("vec-sqrth", 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 half or float or double suffix.
      // Make sure that the double or half entry was not already specified.
      // The float entry will be checked below.
      if (OptionStrings[ValBase.str() + 'd'] ||
          OptionStrings[ValBase.str() + 'h']) {
        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 and half entry
    // as found.
    if (ValBase.back() != 'f' && ValBase.back() != 'd' && ValBase.back() != 'h') {
      OptionStrings[ValBase.str() + 'd'] = true;
      OptionStrings[ValBase.str() + 'h'] = 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 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
/// main 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/PS5.
    bool CXXExceptionsEnabled = Triple.getArch() != llvm::Triple::xcore &&
                                !Triple.isPS() && !Triple.isDriverKit();
    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 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;
 
  if (Triple.isAndroid()) {
    switch (Triple.getArch()) {
    case llvm::Triple::aarch64:
    case llvm::Triple::arm:
    case llvm::Triple::armeb:
    case llvm::Triple::thumb:
    case llvm::Triple::thumbeb:
    case llvm::Triple::riscv64:
      return true;
    default:
      break;
    }
  }
 
  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::sparc:
  case llvm::Triple::sparcel:
  case llvm::Triple::sparcv9:
  case llvm::Triple::amdgcn:
  case llvm::Triple::r600:
  case llvm::Triple::csky:
  case llvm::Triple::loongarch32:
  case llvm::Triple::loongarch64:
    return !areOptimizationsEnabled(Args);
  default:
    break;
  }
 
  if (Triple.isOSFuchsia() || Triple.isOSNetBSD()) {
    return !areOptimizationsEnabled(Args);
  }
 
  if (Triple.isOSLinux() || 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:
    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.isPS() || Triple.isVE() ||
                   (Triple.isAndroid() && Triple.isRISCV64()));
  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 const char *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));
  }
  StringRef Path(CmdArgs.back());
  return Path.substr(Path.find('=') + 1).data();
}
 
static void addDebugObjectName(const ArgList &Args, ArgStringList &CmdArgs,
                               const char *DebugCompilationDir,
                               const char *OutputFileName) {
  // No need to generate a value for -object-file-name if it was provided.
  for (auto *Arg : Args.filtered(options::OPT_Xclang))
    if (StringRef(Arg->getValue()).startswith("-object-file-name"))
      return;
 
  if (Args.hasArg(options::OPT_object_file_name_EQ))
    return;
 
  SmallString<128> ObjFileNameForDebug(OutputFileName);
  if (ObjFileNameForDebug != "-" &&
      !llvm::sys::path::is_absolute(ObjFileNameForDebug) &&
      (!DebugCompilationDir ||
       llvm::sys::path::is_absolute(DebugCompilationDir))) {
    // Make the path absolute in the debug infos like MSVC does.
    llvm::sys::fs::make_absolute(ObjFileNameForDebug);
  }
  // If the object file name is a relative path, then always use Windows
  // backslash style as -object-file-name is used for embedding object file path
  // in codeview and it can only be generated when targeting on Windows.
  // Otherwise, just use native absolute path.
  llvm::sys::path::Style Style =
      llvm::sys::path::is_absolute(ObjFileNameForDebug)
          ? llvm::sys::path::Style::native
          : llvm::sys::path::Style::windows_backslash;
  llvm::sys::path::remove_dots(ObjFileNameForDebug, /*remove_dot_dot=*/true,
                               Style);
  CmdArgs.push_back(
      Args.MakeArgString(Twine("-object-file-name=") + ObjFileNameForDebug));
}
 
/// Add a CC1 and CC1AS option to specify the debug file path prefix map.
static void addDebugPrefixMapArg(const Driver &D, const ToolChain &TC,
                                 const ArgList &Args, ArgStringList &CmdArgs) {
  auto AddOneArg = [&](StringRef Map, StringRef Name) {
    if (!Map.contains('='))
      D.Diag(diag::err_drv_invalid_argument_to_option) << Map << Name;
    else
      CmdArgs.push_back(Args.MakeArgString("-fdebug-prefix-map=" + Map));
  };
 
  for (const Arg *A : Args.filtered(options::OPT_ffile_prefix_map_EQ,
                                    options::OPT_fdebug_prefix_map_EQ)) {
    AddOneArg(A->getValue(), A->getOption().getName());
    A->claim();
  }
  std::string GlobalRemapEntry = TC.GetGlobalDebugPathRemapping();
  if (GlobalRemapEntry.empty())
    return;
  AddOneArg(GlobalRemapEntry, "environment");
}
 
/// 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.contains('='))
      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.contains('='))
      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 JobAction &JA, const InputInfo &Output,
                                   const ArgList &Args, SanitizerArgs &SanArgs,
                                   ArgStringList &CmdArgs) {
  const Driver &D = TC.getDriver();
  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 = getLastCSProfileGenerateArg(Args);
 
  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 (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 (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->getSpelling() << Val;
  }
 
  int FunctionGroups = 1;
  int SelectedFunctionGroup = 0;
  if (const auto *A = Args.getLastArg(options::OPT_fprofile_function_groups)) {
    StringRef Val = A->getValue();
    if (Val.getAsInteger(0, FunctionGroups) || FunctionGroups < 1)
      D.Diag(diag::err_drv_invalid_int_value) << A->getAsString(Args) << Val;
  }
  if (const auto *A =
          Args.getLastArg(options::OPT_fprofile_selected_function_group)) {
    StringRef Val = A->getValue();
    if (Val.getAsInteger(0, SelectedFunctionGroup) ||
        SelectedFunctionGroup < 0 || SelectedFunctionGroup >= FunctionGroups)
      D.Diag(diag::err_drv_invalid_int_value) << A->getAsString(Args) << Val;
  }
  if (FunctionGroups != 1)
    CmdArgs.push_back(Args.MakeArgString("-fprofile-function-groups=" +
                                         Twine(FunctionGroups)));
  if (SelectedFunctionGroup != 0)
    CmdArgs.push_back(Args.MakeArgString("-fprofile-selected-function-group=" +
                                         Twine(SelectedFunctionGroup)));
 
  // 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);
 
  // TODO: Don't claim -c/-S to warn about -fsyntax-only -c/-S, -E -c/-S,
  // like we warn about -fsyntax-only -E.
  (void)(Args.hasArg(options::OPT_c) || Args.hasArg(options::OPT_S));
 
  // Put the .gcno and .gcda files (if needed) next to the primary output file,
  // or fall back to a file in the current directory for `clang -c --coverage
  // d/a.c` in the absence of -o.
  if (EmitCovNotes || EmitCovData) {
    SmallString<128> CoverageFilename;
    if (Arg *DumpDir = Args.getLastArgNoClaim(options::OPT_dumpdir)) {
      // Form ${dumpdir}${basename}.gcno. Note that dumpdir may not end with a
      // path separator.
      CoverageFilename = DumpDir->getValue();
      CoverageFilename += llvm::sys::path::filename(Output.getBaseInput());
    } else if (Arg *FinalOutput =
                   C.getArgs().getLastArg(options::OPT__SLASH_Fo)) {
      CoverageFilename = FinalOutput->getValue();
    } else if (Arg *FinalOutput = C.getArgs().getLastArg(options::OPT_o)) {
      CoverageFilename = FinalOutput->getValue();
    } else {
      CoverageFilename = llvm::sys::path::filename(Output.getBaseInput());
    }
    if (llvm::sys::path::is_relative(CoverageFilename))
      (void)D.getVFS().makeAbsolute(CoverageFilename);
    llvm::sys::path::replace_extension(CoverageFilename, "gcno");
    if (EmitCovNotes) {
      CmdArgs.push_back(
          Args.MakeArgString("-coverage-notes-file=" + CoverageFilename));
    }
 
    if (EmitCovData) {
      if (FProfileDir) {
        SmallString<128> Gcno = std::move(CoverageFilename);
        CoverageFilename = FProfileDir->getValue();
        llvm::sys::path::append(CoverageFilename, Gcno);
      }
      llvm::sys::path::replace_extension(CoverageFilename, "gcda");
      CmdArgs.push_back(
          Args.MakeArgString("-coverage-data-file=" + 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;
 
  return llvm::any_of(A->inputs(), ContainsCompileAction);
}
 
/// 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);
}
 
static void
RenderDebugEnablingArgs(const ArgList &Args, ArgStringList &CmdArgs,
                        llvm::codegenoptions::DebugInfoKind DebugInfoKind,
                        unsigned DwarfVersion,
                        llvm::DebuggerKind DebuggerTuning) {
  addDebugInfoKind(CmdArgs, DebugInfoKind);
  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") {
      if (llvm::compression::zlib::isAvailable()) {
        CmdArgs.push_back(
            Args.MakeArgString("--compress-debug-sections=" + Twine(Value)));
      } else {
        D.Diag(diag::warn_debug_compression_unavailable) << "zlib";
      }
    } else if (Value == "zstd") {
      if (llvm::compression::zstd::isAvailable()) {
        CmdArgs.push_back(
            Args.MakeArgString("--compress-debug-sections=" + Twine(Value)));
      } else {
        D.Diag(diag::warn_debug_compression_unavailable) << "zstd";
      }
    } else {
      D.Diag(diag::err_drv_unsupported_option_argument)
          << A->getSpelling() << Value;
    }
  }
}
 
static void handleAMDGPUCodeObjectVersionOptions(const Driver &D,
                                                 const ArgList &Args,
                                                 ArgStringList &CmdArgs,
                                                 bool IsCC1As = false) {
  // 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");
    // -cc1as does not accept -mcode-object-version option.
    if (!IsCC1As)
      CmdArgs.insert(CmdArgs.begin() + 1,
                     Args.MakeArgString(Twine("-mcode-object-version=") +
                                        Twine(CodeObjVer)));
  }
}
 
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);
 
    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;
        quoteMakeTarget(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;
      quoteMakeTarget(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 (Args.hasFlag(options::OPT_canonical_prefixes,
                     options::OPT_no_canonical_prefixes, true))
      CmdArgs.push_back("-canonical-system-headers");
    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 compiling for a GPU target we want to override the system headers
  // with ones created by the 'libc' project if present.
  if (!Args.hasArg(options::OPT_nostdinc) &&
      !Args.hasArg(options::OPT_nogpuinc) &&
      !Args.hasArg(options::OPT_nobuiltininc)) {
    // Without an offloading language we will include these headers directly.
    // Offloading languages will instead only use the declarations stored in
    // the resource directory at clang/lib/Headers/llvm_libc_wrappers.
    if ((getToolChain().getTriple().isNVPTX() ||
         getToolChain().getTriple().isAMDGCN()) &&
        C.getActiveOffloadKinds() == Action::OFK_None) {
      SmallString<128> P(llvm::sys::path::parent_path(D.InstalledDir));
      llvm::sys::path::append(P, "include");
      llvm::sys::path::append(P, "gpu-none-llvm");
      CmdArgs.push_back("-c-isystem");
      CmdArgs.push_back(Args.MakeArgString(P));
    } else if (C.getActiveOffloadKinds() == Action::OFK_OpenMP) {
      // TODO: CUDA / HIP include their own headers for some common functions
      // implemented here. We'll need to clean those up so they do not conflict.
      SmallString<128> P(D.ResourceDir);
      llvm::sys::path::append(P, "include");
      llvm::sys::path::append(P, "llvm_libc_wrappers");
      CmdArgs.push_back("-internal-isystem");
      CmdArgs.push_back(Args.MakeArgString(P));
    }
  }
 
  // 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) &&
      !Args.hasArg(options::OPT_nostdinc) &&
      !Args.hasArg(options::OPT_nogpuinc) &&
      (getToolChain().getTriple().isNVPTX() ||
       getToolChain().getTriple().isAMDGCN())) {
    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) &&
        D.getProbePrecompiled()) {
      // 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 (D.getVFS().exists(P))
        FoundPCH = true;
 
      if (!FoundPCH) {
        llvm::sys::path::replace_extension(P, "gch");
        if (D.getVFS().exists(P)) {
          FoundPCH = true;
          D.Diag(diag::warn_drv_include_probe_gch) << A->getAsString(Args) << P;
        }
      }
 
      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;
    } else if (A->getOption().matches(options::OPT_ibuiltininc)) {
      // This is used only 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);
 
  Args.AddLastArg(CmdArgs, options::OPT_ffile_reproducible,
                  options::OPT_fno_file_reproducible);
 
  if (const char *Epoch = std::getenv("SOURCE_DATE_EPOCH")) {
    CmdArgs.push_back("-source-date-epoch");
    CmdArgs.push_back(Args.MakeArgString(Epoch));
  }
}
 
// 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 Driver &D, 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(D, Args, Triple, /*FromAs*/ false);
    ABIName = llvm::ARM::computeDefaultTargetABI(Triple, CPU).data();
  }
 
  CmdArgs.push_back("-target-abi");
  CmdArgs.push_back(ABIName);
}
 
void AddUnalignedAccessWarning(ArgStringList &CmdArgs) {
  auto StrictAlignIter =
      llvm::find_if(llvm::reverse(CmdArgs), [](StringRef Arg) {
        return Arg == "+strict-align" || Arg == "-strict-align";
      });
  if (StrictAlignIter != CmdArgs.rend() &&
      StringRef(*StrictAlignIter) == "+strict-align")
    CmdArgs.push_back("-Wunaligned-access");
}
}
 
static void CollectARMPACBTIOptions(const ToolChain &TC, const ArgList &Args,
                                    ArgStringList &CmdArgs, bool isAArch64) {
  const Arg *A = isAArch64
                     ? Args.getLastArg(options::OPT_msign_return_address_EQ,
                                       options::OPT_mbranch_protection_EQ)
                     : Args.getLastArg(options::OPT_mbranch_protection_EQ);
  if (!A)
    return;
 
  const Driver &D = TC.getDriver();
  const llvm::Triple &Triple = TC.getEffectiveTriple();
  if (!(isAArch64 || (Triple.isArmT32() && Triple.isArmMClass())))
    D.Diag(diag::warn_incompatible_branch_protection_option)
        << Triple.getArchName();
 
  StringRef Scope, Key;
  bool IndirectBranches;
 
  if (A->getOption().matches(options::OPT_msign_return_address_EQ)) {
    Scope = A->getValue();
    if (Scope != "none" && Scope != "non-leaf" && Scope != "all")
      D.Diag(diag::err_drv_unsupported_option_argument)
          << A->getSpelling() << Scope;
    Key = "a_key";
    IndirectBranches = false;
  } else {
    StringRef DiagMsg;
    llvm::ARM::ParsedBranchProtection PBP;
    if (!llvm::ARM::parseBranchProtection(A->getValue(), PBP, DiagMsg))
      D.Diag(diag::err_drv_unsupported_option_argument)
          << A->getSpelling() << DiagMsg;
    if (!isAArch64 && PBP.Key == "b_key")
      D.Diag(diag::warn_unsupported_branch_protection)
          << "b-key" << A->getAsString(Args);
    Scope = PBP.Scope;
    Key = PBP.Key;
    IndirectBranches = PBP.BranchTargetEnforcement;
  }
 
  CmdArgs.push_back(
      Args.MakeArgString(Twine("-msign-return-address=") + Scope));
  if (!Scope.equals("none"))
    CmdArgs.push_back(
        Args.MakeArgString(Twine("-msign-return-address-key=") + Key));
  if (IndirectBranches)
    CmdArgs.push_back("-mbranch-target-enforce");
}
 
void Clang::AddARMTargetArgs(const llvm::Triple &Triple, const ArgList &Args,
                             ArgStringList &CmdArgs, bool KernelOrKext) const {
  RenderARMABI(getToolChain().getDriver(), 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);
 
  // Enable/disable return address signing and indirect branch targets.
  CollectARMPACBTIOptions(getToolChain(), Args, CmdArgs, false /*isAArch64*/);
 
  AddUnalignedAccessWarning(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);
    break;
 
  case llvm::Triple::aarch64:
  case llvm::Triple::aarch64_32:
  case llvm::Triple::aarch64_be:
    AddAArch64TargetArgs(Args, CmdArgs);
    break;
 
  case llvm::Triple::loongarch32:
  case llvm::Triple::loongarch64:
    AddLoongArchTargetArgs(Args, CmdArgs);
    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);
 
  // 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.
  CollectARMPACBTIOptions(getToolChain(), Args, CmdArgs, true /*isAArch64*/);
 
  // 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") || Val.equals("128+") ||
        Val.equals("256+") || Val.equals("512+") || Val.equals("1024+") ||
        Val.equals("2048+")) {
      unsigned Bits = 0;
      if (Val.endswith("+"))
        Val = Val.substr(0, Val.size() - 1);
      else {
        bool Invalid = Val.getAsInteger(10, Bits); (void)Invalid;
        assert(!Invalid && "Failed to parse value");
        CmdArgs.push_back(
            Args.MakeArgString("-mvscale-max=" + llvm::Twine(Bits / 128)));
      }
 
      bool Invalid = Val.getAsInteger(10, Bits); (void)Invalid;
      assert(!Invalid && "Failed to parse value");
      CmdArgs.push_back(
          Args.MakeArgString("-mvscale-min=" + llvm::Twine(Bits / 128)));
    // 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->getSpelling() << Val;
  }
 
  AddAAPCSVolatileBitfieldArgs(Args, CmdArgs);
 
  if (const Arg *A = Args.getLastArg(clang::driver::options::OPT_mtune_EQ)) {
    CmdArgs.push_back("-tune-cpu");
    if (strcmp(A->getValue(), "native") == 0)
      CmdArgs.push_back(Args.MakeArgString(llvm::sys::getHostCPUName()));
    else
      CmdArgs.push_back(A->getValue());
  }
 
  AddUnalignedAccessWarning(CmdArgs);
}
 
void Clang::AddLoongArchTargetArgs(const ArgList &Args,
                                   ArgStringList &CmdArgs) const {
  const llvm::Triple &Triple = getToolChain().getTriple();
 
  CmdArgs.push_back("-target-abi");
  CmdArgs.push_back(
      loongarch::getLoongArchABI(getToolChain().getDriver(), Args, Triple)
          .data());
 
  // Handle -mtune.
  if (const Arg *A = Args.getLastArg(options::OPT_mtune_EQ)) {
    std::string TuneCPU = A->getValue();
    TuneCPU = loongarch::postProcessTargetCPUString(TuneCPU, Triple);
    CmdArgs.push_back("-tune-cpu");
    CmdArgs.push_back(Args.MakeArgString(TuneCPU));
  }
}
 
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 (Args.getLastArg(options::OPT_mfix4300)) {
    CmdArgs.push_back("-mllvm");
    CmdArgs.push_back("-mfix4300");
  }
 
  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->getSpelling() << 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 {
  const Driver &D = getToolChain().getDriver();
  const llvm::Triple &T = getToolChain().getTriple();
  if (Args.getLastArg(options::OPT_mtune_EQ)) {
    CmdArgs.push_back("-tune-cpu");
    std::string CPU = ppc::getPPCTuneCPU(Args, T);
    CmdArgs.push_back(Args.MakeArgString(CPU));
  }
 
  // Select the ABI to use.
  const char *ABIName = nullptr;
  if (T.isOSBinFormatELF()) {
    switch (getToolChain().getArch()) {
    case llvm::Triple::ppc64: {
      if (T.isPPC64ELFv2ABI())
        ABIName = "elfv2";
      else
        ABIName = "elfv1";
      break;
    }
    case llvm::Triple::ppc64le:
      ABIName = "elfv2";
      break;
    default:
      break;
    }
  }
 
  bool IEEELongDouble = getToolChain().defaultToIEEELongDouble();
  bool VecExtabi = false;
  for (const Arg *A : Args.filtered(options::OPT_mabi_EQ)) {
    StringRef V = A->getValue();
    if (V == "ieeelongdouble") {
      IEEELongDouble = true;
      A->claim();
    } else if (V == "ibmlongdouble") {
      IEEELongDouble = false;
      A->claim();
    } else if (V == "vec-default") {
      VecExtabi = false;
      A->claim();
    } else if (V == "vec-extabi") {
      VecExtabi = true;
      A->claim();
    } else if (V == "elfv1") {
      ABIName = "elfv1";
      A->claim();
    } else if (V == "elfv2") {
      ABIName = "elfv2";
      A->claim();
    } 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");
  if (VecExtabi) {
    if (!T.isOSAIX())
      D.Diag(diag::err_drv_unsupported_opt_for_target)
          << "-mabi=vec-extabi" << T.str();
    CmdArgs.push_back("-mabi=vec-extabi");
  }
 
  ppc::FloatABI FloatABI = ppc::getPPCFloatABI(D, 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 (Triple.isAndroid()) {
    // GP relaxation is not supported on Android.
    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);
 
  if (!Args.hasFlag(options::OPT_mimplicit_float,
                    options::OPT_mno_implicit_float, true))
    CmdArgs.push_back("-no-implicit-float");
 
  if (const Arg *A = Args.getLastArg(options::OPT_mtune_EQ)) {
    CmdArgs.push_back("-tune-cpu");
    if (strcmp(A->getValue(), "native") == 0)
      CmdArgs.push_back(Args.MakeArgString(llvm::sys::getHostCPUName()));
    else
      CmdArgs.push_back(A->getValue());
  }
 
  // Handle -mrvv-vector-bits=<bits>
  if (Arg *A = Args.getLastArg(options::OPT_mrvv_vector_bits_EQ)) {
    StringRef Val = A->getValue();
    const Driver &D = getToolChain().getDriver();
 
    // Get minimum VLen from march.
    unsigned MinVLen = 0;
    StringRef Arch = riscv::getRISCVArch(Args, Triple);
    auto ISAInfo = llvm::RISCVISAInfo::parseArchString(
        Arch, /*EnableExperimentalExtensions*/ true);
    if (!ISAInfo) {
      // Ignore parsing error.
      consumeError(ISAInfo.takeError());
    } else {
      MinVLen = (*ISAInfo)->getMinVLen();
    }
 
    // If the value is "zvl", use MinVLen from march. Otherwise, try to parse
    // as integer as long as we have a MinVLen.
    unsigned Bits = 0;
    if (Val.equals("zvl") && MinVLen >= llvm::RISCV::RVVBitsPerBlock) {
      Bits = MinVLen;
    } else if (!Val.getAsInteger(10, Bits)) {
      // Only accept power of 2 values beteen RVVBitsPerBlock and 65536 that
      // at least MinVLen.
      if (Bits < MinVLen || Bits < llvm::RISCV::RVVBitsPerBlock ||
          Bits > 65536 || !llvm::isPowerOf2_32(Bits))
        Bits = 0;
    }
 
    // If we got a valid value try to use it.
    if (Bits != 0) {
      unsigned VScaleMin = Bits / llvm::RISCV::RVVBitsPerBlock;
      CmdArgs.push_back(
          Args.MakeArgString("-mvscale-max=" + llvm::Twine(VScaleMin)));
      CmdArgs.push_back(
          Args.MakeArgString("-mvscale-min=" + llvm::Twine(VScaleMin)));
    } else if (!Val.equals("scalable")) {
      // Handle the unsupported values passed to mrvv-vector-bits.
      D.Diag(diag::err_drv_unsupported_option_argument)
          << A->getSpelling() << Val;
    }
  }
}
 
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");
  }
 
  if (const Arg *A = Args.getLastArg(clang::driver::options::OPT_mtune_EQ)) {
    StringRef Name = A->getValue();
    std::string TuneCPU;
    if (Name == "native")
      TuneCPU = std::string(llvm::sys::getHostCPUName());
    else
      TuneCPU = std::string(Name);
 
    CmdArgs.push_back("-tune-cpu");
    CmdArgs.push_back(Args.MakeArgString(TuneCPU));
  }
}
 
void Clang::AddSystemZTargetArgs(const ArgList &Args,
                                 ArgStringList &CmdArgs) const {
  if (const Arg *A = Args.getLastArg(options::OPT_mtune_EQ)) {
    CmdArgs.push_back("-tune-cpu");
    if (strcmp(A->getValue(), "native") == 0)
      CmdArgs.push_back(Args.MakeArgString(llvm::sys::getHostCPUName()));
    else
      CmdArgs.push_back(A->getValue());
  }
 
  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));
      CmdArgs.push_back(Args.MakeArgString("-inline-asm=" + Value));
    } else {
      D.Diag(diag::err_drv_unsupported_option_argument)
          << A->getSpelling() << Value;
    }
  } else if (D.IsCLMode()) {
    CmdArgs.push_back("-mllvm");
    CmdArgs.push_back("-x86-asm-syntax=intel");
  }
 
  if (Arg *A = Args.getLastArg(options::OPT_mskip_rax_setup,
                               options::OPT_mno_skip_rax_setup))
    if (A->getOption().matches(options::OPT_mskip_rax_setup))
      CmdArgs.push_back(Args.MakeArgString("-mskip-rax-setup"));
 
  // 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/PS5.
  std::string TuneCPU;
  if (!Args.hasArg(clang::driver::options::OPT_march_EQ) &&
      !getToolChain().getTriple().isPS())
    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)));
  }
 
  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->getSpelling() << 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=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 | llvm::sys::fs::OF_Append);
    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()) << "\"";
  if (Output.isFilename())
    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()) << "\"";
  if (Output.isFilename())
    CDB << ", \"-o\", \"" << escape(Output.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;
    // Skip output.
    if (O.getID() == options::OPT_o)
      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");
 
  Args.AddLastArg(CmdArgs, options::OPT_femit_dwarf_unwind_EQ);
 
  Args.addOptInFlag(CmdArgs, options::OPT_femit_compact_unwind_non_canonical,
                    options::OPT_fno_emit_compact_unwind_non_canonical);
 
  // 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 = false;
  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->getSpelling() << 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::wasm32:
      case llvm::Triple::wasm64:
        if (Value == "--no-type-check") {
          CmdArgs.push_back("-mno-type-check");
          continue;
        }
        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,
                                  llvm::codegenoptions::DebugInfoConstructor,
                                  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->getSpelling() << Value;
      }
    }
  }
  if (ImplicitIt.size())
    AddARMImplicitITArgs(Args, CmdArgs, ImplicitIt);
  if (!UseRelaxRelocations)
    CmdArgs.push_back("-mrelax-relocations=no");
  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);
 
  if (const char *AsSecureLogFile = getenv("AS_SECURE_LOG_FILE")) {
    CmdArgs.push_back("-as-secure-log-file");
    CmdArgs.push_back(Args.MakeArgString(AsSecureLogFile));
  }
}
 
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;
  bool ApproxFunc = false;
  // -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 = "";
  // -ffp-eval-method options: double, extended, source
  StringRef FPEvalMethod = "";
  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;
  // CUDA and HIP don't rely on the frontend to pass an ffp-contract option.
  // If one wasn't given by the user, don't pass it here.
  StringRef FPContract;
  StringRef LastSeenFfpContractOption;
  bool SeenUnsafeMathModeOption = false;
  if (!JA.isDeviceOffloading(Action::OFK_Cuda) &&
      !JA.isOffloading(Action::OFK_HIP))
    FPContract = "on";
  bool StrictFPModel = false;
  StringRef Float16ExcessPrecision = "";
  StringRef BFloat16ExcessPrecision = "";
 
  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;
      ApproxFunc = false;
      // 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 = "on";
      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_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_option)
            << Args.MakeArgString("-ffp-model=" + FPModel)
            << Args.MakeArgString("-ffp-model=" + Val);
      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 = "on";
        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->getSpelling() << 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_fapprox_func:         ApproxFunc = true;        break;
    case options::OPT_fno_approx_func:      ApproxFunc = 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_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_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());
      DenormalFP32Math = DenormalFPMath;
      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=on.
        // -ffp-model=precise sets PreciseFPModel to on and Val to
        // "precise". FPContract is set.
        ;
      } else if (Val.equals("fast") || Val.equals("on") || Val.equals("off") ||
                 Val.equals("fast-honor-pragmas")) {
        FPContract = Val;
        LastSeenFfpContractOption = Val;
      } else
        D.Diag(diag::err_drv_unsupported_option_argument)
            << A->getSpelling() << 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_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->getSpelling() << Val;
      break;
    }
 
    // Validate and pass through -ffp-eval-method option.
    case options::OPT_ffp_eval_method_EQ: {
      StringRef Val = A->getValue();
      if (Val.equals("double") || Val.equals("extended") ||
          Val.equals("source"))
        FPEvalMethod = Val;
      else
        D.Diag(diag::err_drv_unsupported_option_argument)
            << A->getSpelling() << Val;
      break;
    }
 
    case options::OPT_fexcess_precision_EQ: {
      StringRef Val = A->getValue();
      const llvm::Triple::ArchType Arch = TC.getArch();
      if (Arch == llvm::Triple::x86 || Arch == llvm::Triple::x86_64) {
        if (Val.equals("standard") || Val.equals("fast"))
          Float16ExcessPrecision = Val;
        // To make it GCC compatible, allow the value of "16" which
        // means disable excess precision, the same meaning than clang's
        // equivalent value "none".
        else if (Val.equals("16"))
          Float16ExcessPrecision = "none";
        else
          D.Diag(diag::err_drv_unsupported_option_argument)
              << A->getSpelling() << Val;
      } else {
        if (!(Val.equals("standard") || Val.equals("fast")))
          D.Diag(diag::err_drv_unsupported_option_argument)
              << A->getSpelling() << Val;
      }
      BFloat16ExcessPrecision = Float16ExcessPrecision;
      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;
      ApproxFunc = true;
      TrappingMath = false;
      FPExceptionBehavior = "";
      FPContract = "fast";
      SeenUnsafeMathModeOption = true;
      break;
    case options::OPT_fno_unsafe_math_optimizations:
      AssociativeMath = false;
      ReciprocalMath = false;
      SignedZeros = true;
      ApproxFunc = false;
      TrappingMath = true;
      FPExceptionBehavior = "strict";
 
      // The target may have opted to flush by default, so force IEEE.
      DenormalFPMath = llvm::DenormalMode::getIEEE();
      DenormalFP32Math = llvm::DenormalMode::getIEEE();
      if (!JA.isDeviceOffloading(Action::OFK_Cuda) &&
          !JA.isOffloading(Action::OFK_HIP)) {
        if (LastSeenFfpContractOption != "") {
          FPContract = LastSeenFfpContractOption;
        } else if (SeenUnsafeMathModeOption)
          FPContract = "on";
      }
      break;
 
    case options::OPT_Ofast:
      // If -Ofast is the optimization level, then -ffast-math should be enabled
      if (!OFastEnabled)
        continue;
      [[fallthrough]];
    case options::OPT_ffast_math:
      HonorINFs = false;
      HonorNaNs = false;
      MathErrno = false;
      AssociativeMath = true;
      ReciprocalMath = true;
      ApproxFunc = true;
      SignedZeros = false;
      TrappingMath = false;
      RoundingFPMath = false;
      FPExceptionBehavior = "";
      // If fast-math is set then set the fp-contract mode to fast.
      FPContract = "fast";
      SeenUnsafeMathModeOption = true;
      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;
      ApproxFunc = false;
      SignedZeros = true;
      // -fno_fast_math restores default denormal and fpcontract handling
      DenormalFPMath = DefaultDenormalFPMath;
      DenormalFP32Math = llvm::DenormalMode::getIEEE();
      if (!JA.isDeviceOffloading(Action::OFK_Cuda) &&
          !JA.isOffloading(Action::OFK_HIP)) {
        if (LastSeenFfpContractOption != "") {
          FPContract = LastSeenFfpContractOption;
        } else if (SeenUnsafeMathModeOption)
          FPContract = "on";
      }
      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 && !ApproxFunc &&
          DenormalFPMath == llvm::DenormalMode::getIEEE() &&
          DenormalFP32Math == llvm::DenormalMode::getIEEE() &&
          FPContract.equals("off"))
        // OK: Current Arg doesn't conflict with -ffp-model=strict
        ;
      else {
        StrictFPModel = false;
        FPModel = "";
        auto RHS = (A->getNumValues() == 0)
                       ? A->getSpelling()
                       : Args.MakeArgString(A->getSpelling() + A->getValue());
        if (RHS != "-ffp-model=strict")
          D.Diag(clang::diag::warn_drv_overriding_option)
              << "-ffp-model=strict" << RHS;
      }
    }
 
    // 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 (ApproxFunc)
    CmdArgs.push_back("-fapprox-func");
 
  if (MathErrno)
    CmdArgs.push_back("-fmath-errno");
 
 if (AssociativeMath && ReciprocalMath && !SignedZeros && ApproxFunc &&
     !TrappingMath)
    CmdArgs.push_back("-funsafe-math-optimizations");
 
  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));
 
  if (!FPEvalMethod.empty())
    CmdArgs.push_back(Args.MakeArgString("-ffp-eval-method=" + FPEvalMethod));
 
  if (!Float16ExcessPrecision.empty())
    CmdArgs.push_back(Args.MakeArgString("-ffloat16-excess-precision=" +
                                         Float16ExcessPrecision));
  if (!BFloat16ExcessPrecision.empty())
    CmdArgs.push_back(Args.MakeArgString("-fbfloat16-excess-precision=" +
                                         BFloat16ExcessPrecision));
 
  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 && ApproxFunc &&
      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_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) {
  // 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/PS5.
    if (Triple.isPS()) {
      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.isPS()) {
      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 bool isValidSymbolName(StringRef S) {
  if (S.empty())
    return false;
 
  if (std::isdigit(S[0]))
    return false;
 
  return llvm::all_of(S, [](char C) { return std::isalnum(C) || C == '_'; });
}
 
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;
 
    if (EffectiveTriple.isBPF() && StackProtectorLevel != LangOptions::SSPOff) {
      D.Diag(diag::warn_drv_unsupported_option_for_target)
          << A->getSpelling() << EffectiveTriple.getTriple();
      StackProtectorLevel = DefaultStackProtectorLevel;
    }
  } 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() &&
        !EffectiveTriple.isARM() && !EffectiveTriple.isThumb())
      D.Diag(diag::err_drv_unsupported_opt_for_target)
          << A->getAsString(Args) << TripleStr;
    if ((EffectiveTriple.isX86() || EffectiveTriple.isARM() ||
         EffectiveTriple.isThumb()) &&
        Value != "tls" && Value != "global") {
      D.Diag(diag::err_drv_invalid_value_with_suggestion)
          << A->getOption().getName() << Value << "tls global";
      return;
    }
    if ((EffectiveTriple.isARM() || EffectiveTriple.isThumb()) &&
        Value == "tls") {
      if (!Args.hasArg(options::OPT_mstack_protector_guard_offset_EQ)) {
        D.Diag(diag::err_drv_ssp_missing_offset_argument)
            << A->getAsString(Args);
        return;
      }
      // Check whether the target subarch supports the hardware TLS register
      if (!arm::isHardTPSupported(EffectiveTriple)) {
        D.Diag(diag::err_target_unsupported_tp_hard)
            << EffectiveTriple.getArchName();
        return;
      }
      // Check whether the user asked for something other than -mtp=cp15
      if (Arg *A = Args.getLastArg(options::OPT_mtp_mode_EQ)) {
        StringRef Value = A->getValue();
        if (Value != "cp15") {
          D.Diag(diag::err_drv_argument_not_allowed_with)
              << A->getAsString(Args) << "-mstack-protector-guard=tls";
          return;
        }
      }
      CmdArgs.push_back("-target-feature");
      CmdArgs.push_back("+read-tp-tpidruro");
    }
    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() &&
        !EffectiveTriple.isARM() && !EffectiveTriple.isThumb())
      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;
    }
    if ((EffectiveTriple.isARM() || EffectiveTriple.isThumb()) &&
        (Offset < 0 || Offset > 0xfffff)) {
      D.Diag(diag::err_drv_invalid_int_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);
  }
 
  if (Arg *A = Args.getLastArg(options::OPT_mstack_protector_guard_symbol_EQ)) {
    StringRef Value = A->getValue();
    if (!isValidSymbolName(Value)) {
      D.Diag(diag::err_drv_argument_only_allowed_with)
          << A->getOption().getName() << "legal symbol name";
      return;
    }
    A->render(Args, CmdArgs);
  }
}
 
static void RenderSCPOptions(const ToolChain &TC, const ArgList &Args,
                             ArgStringList &CmdArgs) {
  const llvm::Triple &EffectiveTriple = TC.getEffectiveTriple();
 
  if (!EffectiveTriple.isOSFreeBSD() && !EffectiveTriple.isOSLinux())
    return;
 
  if (!EffectiveTriple.isX86() && !EffectiveTriple.isSystemZ() &&
      !EffectiveTriple.isPPC64())
    return;
 
  Args.addOptInFlag(CmdArgs, options::OPT_fstack_clash_protection,
                    options::OPT_fno_stack_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->getSpelling() << 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()) {
    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));
  } else if (Arg *A = Args.getLastArg(options::OPT_cl_ext_EQ)) {
    std::string CLExtStr = std::string("-cl-ext=") + A->getValue();
    CmdArgs.push_back(Args.MakeArgString(CLExtStr));
  }
 
  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 RenderHLSLOptions(const ArgList &Args, ArgStringList &CmdArgs,
                              types::ID InputType) {
  const unsigned ForwardedArguments[] = {options::OPT_dxil_validator_version,
                                         options::OPT_D,
                                         options::OPT_I,
                                         options::OPT_S,
                                         options::OPT_O,
                                         options::OPT_emit_llvm,
                                         options::OPT_emit_obj,
                                         options::OPT_disable_llvm_passes,
                                         options::OPT_fnative_half_type,
                                         options::OPT_hlsl_entrypoint};
  if (!types::isHLSL(InputType))
    return;
  for (const auto &Arg : ForwardedArguments)
    if (const auto *A = Args.getLastArg(Arg))
      A->renderAsInput(Args, CmdArgs);
  // Add the default headers if dxc_no_stdinc is not set.
  if (!Args.hasArg(options::OPT_dxc_no_stdinc) &&
      !Args.hasArg(options::OPT_nostdinc))
    CmdArgs.push_back("-finclude-default-header");
}
 
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_allowlist_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 Arg *A : Args.filtered(options::OPT_fno_builtin_)) {
    A->claim();
 
    // If -fno-builtin is specified, then there's no need to pass the option to
    // the frontend.
    if (UseBuiltins)
      A->render(Args, CmdArgs);
  }
 
  // 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 (const char *Str = std::getenv("CLANG_MODULE_CACHE_PATH")) {
    Twine Path{Str};
    Path.toVector(Result);
    return Path.getSingleStringRef() != "";
  }
  if (llvm::sys::path::cache_directory(Result)) {
    llvm::sys::path::append(Result, "clang");
    llvm::sys::path::append(Result, "ModuleCache");
    return true;
  }
  return false;
}
 
static bool RenderModulesOptions(Compilation &C, const Driver &D,
                                 const ArgList &Args, const InputInfo &Input,
                                 const InputInfo &Output, const Arg *Std,
                                 ArgStringList &CmdArgs) {
  bool IsCXX = types::isCXX(Input.getType());
  // FIXME: Find a better way to determine whether the input has standard c++
  // modules support by default.
  bool HaveStdCXXModules =
      IsCXX && Std &&
      (Std->containsValue("c++2a") || Std->containsValue("gnu++2a") ||
       Std->containsValue("c++20") || Std->containsValue("gnu++20") ||
       Std->containsValue("c++2b") || Std->containsValue("gnu++2b") ||
       Std->containsValue("c++23") || Std->containsValue("gnu++23") ||
       Std->containsValue("c++2c") || Std->containsValue("gnu++2c") ||
       Std->containsValue("c++26") || Std->containsValue("gnu++26") ||
       Std->containsValue("c++latest") || Std->containsValue("gnu++latest"));
  bool HaveModules = HaveStdCXXModules;
 
  // -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 || !IsCXX) {
      CmdArgs.push_back("-fmodules");
      HaveClangModules = true;
    }
  }
 
  HaveModules |= HaveClangModules;
 
  // -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)
  Args.addOptInFlag(CmdArgs, options::OPT_fmodules_decluse,
                    options::OPT_fno_modules_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) {
    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 || Input.getType() == clang::driver::types::TY_ModuleFile) {
    Args.AddAllArgs(CmdArgs, options::OPT_fmodule_file);
 
    // -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();
    }
  } 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);
 
  if (HaveClangModules) {
    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)std::chrono::duration_cast<std::chrono::seconds>(
                    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);
  } else {
    Args.ClaimAllArgs(options::OPT_fbuild_session_timestamp);
    Args.ClaimAllArgs(options::OPT_fbuild_session_file);
    Args.ClaimAllArgs(options::OPT_fmodules_validate_once_per_build_session);
    Args.ClaimAllArgs(options::OPT_fmodules_validate_system_headers);
    Args.ClaimAllArgs(options::OPT_fno_modules_validate_system_headers);
    Args.ClaimAllArgs(options::OPT_fmodules_disable_diagnostic_validation);
  }
 
  // Claim `-fmodule-output` and `-fmodule-output=` to avoid unused warnings.
  Args.ClaimAllArgs(options::OPT_fmodule_output);
  Args.ClaimAllArgs(options::OPT_fmodule_output_EQ);
 
  return HaveModules;
}
 
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");
    }
  } else if (T.isOSzOS())
    CmdArgs.push_back("-fno-signed-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");
 
  Args.addOptOutFlag(CmdArgs, options::OPT_fdiagnostics_fixit_info,
                     options::OPT_fno_diagnostics_fixit_info);
  Args.addOptOutFlag(CmdArgs, options::OPT_fdiagnostics_show_option,
                     options::OPT_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());
  }
 
  Args.addOptInFlag(CmdArgs, options::OPT_fdiagnostics_show_hotness,
                    options::OPT_fno_diagnostics_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_misexpect_tolerance_EQ)) {
    std::string Opt =
        std::string("-fdiagnostics-misexpect-tolerance=") + 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 (StringRef(A->getValue()) == "sarif" ||
        StringRef(A->getValue()) == "SARIF")
      D.Diag(diag::warn_drv_sarif_format_unstable);
  }
 
  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.
  Args.getLastArg(options::OPT_fcolor_diagnostics,
                  options::OPT_fno_color_diagnostics);
  if (const Arg *A = Args.getLastArg(options::OPT_fdiagnostics_color_EQ)) {
    StringRef Value(A->getValue());
    if (Value != "always" && Value != "never" && Value != "auto")
      D.Diag(diag::err_drv_invalid_argument_to_option)
          << Value << A->getOption().getName();
  }
 
  if (D.getDiags().getDiagnosticOptions().ShowColors)
    CmdArgs.push_back("-fcolor-diagnostics");
 
  if (Args.hasArg(options::OPT_fansi_escape_codes))
    CmdArgs.push_back("-fansi-escape-codes");
 
  Args.addOptOutFlag(CmdArgs, options::OPT_fshow_source_location,
                     options::OPT_fno_show_source_location);
 
  Args.addOptOutFlag(CmdArgs, options::OPT_fdiagnostics_show_line_numbers,
                     options::OPT_fno_diagnostics_show_line_numbers);
 
  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");
 
  Args.addOptOutFlag(CmdArgs, options::OPT_fspell_checking,
                     options::OPT_fno_spell_checking);
}
 
DwarfFissionKind tools::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->getSpelling() << 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 IRInput, ArgStringList &CmdArgs,
                   const InputInfo &Output,
                   llvm::codegenoptions::DebugInfoKind &DebugInfoKind,
                   DwarfFissionKind &DwarfFission) {
  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 = llvm::codegenoptions::DebugInfoConstructor;
 
    // 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 == llvm::codegenoptions::NoDebugInfo ||
          DebugInfoKind == llvm::codegenoptions::DebugDirectivesOnly ||
          (DebugInfoKind == llvm::codegenoptions::DebugLineTablesOnly &&
           SplitDWARFInlining))
        DwarfFission = DwarfFissionKind::None;
    }
  }
 
  // If a debugger tuning argument appeared, remember it.
  bool HasDebuggerTuning = false;
  if (const Arg *A =
          Args.getLastArg(options::OPT_gTune_Group, options::OPT_ggdbN_Group)) {
    HasDebuggerTuning = true;
    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.
  bool EmitDwarf = false;
  if (const Arg *A = getDwarfNArg(Args))
    EmitDwarf = checkDebugInfoOption(A, Args, D, TC);
 
  bool EmitCodeView = false;
  if (const Arg *A = Args.getLastArg(options::OPT_gcodeview))
    EmitCodeView = checkDebugInfoOption(A, Args, D, TC);
 
  // 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 != llvm::codegenoptions::NoDebugInfo) {
    switch (TC.getDefaultDebugFormat()) {
    case llvm::codegenoptions::DIF_CodeView:
      EmitCodeView = true;
      break;
    case llvm::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.
  if (EmitDwarf) {
    RequestedDWARFVersion = getDwarfVersion(TC, Args);
    // Clamp effective DWARF version to the max supported by the toolchain.
    EffectiveDWARFVersion =
        std::min(RequestedDWARFVersion, TC.getMaxDwarfVersion());
  } else {
    Args.ClaimAllArgs(options::OPT_fdebug_default_version);
  }
 
  // -gline-directives-only supported only for the DWARF debug info.
  if (RequestedDWARFVersion == 0 &&
      DebugInfoKind == llvm::codegenoptions::DebugDirectivesOnly)
    DebugInfoKind = llvm::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 (Args.hasFlag(options::OPT_gmodules, options::OPT_gno_modules, false)) {
    // If -gline-tables-only or -gline-directives-only is the last option it
    // wins.
    if (checkDebugInfoOption(Args.getLastArg(options::OPT_gmodules), Args, D,
                             TC)) {
      if (DebugInfoKind != llvm::codegenoptions::DebugLineTablesOnly &&
          DebugInfoKind != llvm::codegenoptions::DebugDirectivesOnly) {
        DebugInfoKind = llvm::codegenoptions::DebugInfoConstructor;
        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 == llvm::codegenoptions::LimitedDebugInfo ||
      DebugInfoKind == llvm::codegenoptions::DebugInfoConstructor) {
    if (Args.hasFlag(options::OPT_fno_eliminate_unused_debug_types,
                     options::OPT_feliminate_unused_debug_types, false))
      DebugInfoKind = llvm::codegenoptions::UnusedTypeInfo;
    else if (NeedFullDebug)
      DebugInfoKind = llvm::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");
 
    Args.addOptInFlag(CmdArgs, options::OPT_gcodeview_ghash,
                      options::OPT_gno_codeview_ghash);
 
    Args.addOptOutFlag(CmdArgs, options::OPT_gcodeview_command_line,
                       options::OPT_gno_codeview_command_line);
  }
 
  Args.addOptOutFlag(CmdArgs, options::OPT_ginline_line_tables,
                     options::OPT_gno_inline_line_tables);
 
  // When emitting remarks, we need at least debug lines in the output.
  if (willEmitRemarks(Args) &&
      DebugInfoKind <= llvm::codegenoptions::DebugDirectivesOnly)
    DebugInfoKind = llvm::codegenoptions::DebugLineTablesOnly;
 
  // Adjust the debug info kind for the given toolchain.
  TC.adjustDebugInfoKind(DebugInfoKind, Args);
 
  // On AIX, the debugger tuning option can be omitted if it is not explicitly
  // set.
  RenderDebugEnablingArgs(Args, CmdArgs, DebugInfoKind, EffectiveDWARFVersion,
                          T.isOSAIX() && !HasDebuggerTuning
                              ? llvm::DebuggerKind::Default
                              : 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");
  const auto *SimpleTemplateNamesArg =
      Args.getLastArg(options::OPT_gsimple_template_names,
                      options::OPT_gno_simple_template_names);
  bool ForwardTemplateParams = DebuggerTuning == llvm::DebuggerKind::SCE;
  if (SimpleTemplateNamesArg &&
      checkDebugInfoOption(SimpleTemplateNamesArg, Args, D, TC)) {
    const auto &Opt = SimpleTemplateNamesArg->getOption();
    if (Opt.matches(options::OPT_gsimple_template_names)) {
      ForwardTemplateParams = true;
      CmdArgs.push_back("-gsimple-template-names=simple");
    }
  }
 
  if (const Arg *A = Args.getLastArg(options::OPT_gsrc_hash_EQ)) {
    StringRef v = A->getValue();
    CmdArgs.push_back(Args.MakeArgString("-gsrc-hash=" + v));
  }
 
  Args.addOptInFlag(CmdArgs, options::OPT_fdebug_ranges_base_address,
                    options::OPT_fno_debug_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");
  }
 
  Args.addOptInFlag(CmdArgs, options::OPT_fforce_dwarf_frame,
                    options::OPT_fno_force_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");
    }
  }
 
  // To avoid join/split of directory+filename, the integrated assembler prefers
  // the directory form of .file on all DWARF versions. GNU as doesn't allow the
  // form before DWARF v5.
  if (!Args.hasFlag(options::OPT_fdwarf_directory_asm,
                    options::OPT_fno_dwarf_directory_asm,
                    TC.useIntegratedAs() || EffectiveDWARFVersion >= 5))
    CmdArgs.push_back("-fno-dwarf-directory-asm");
 
  // Decide how to render forward declarations of template instantiations.
  // SCE wants full descriptions, others just get them in the name.
  if (ForwardTemplateParams)
    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);
 
  // This controls whether or not we perform JustMyCode instrumentation.
  if (Args.hasFlag(options::OPT_fjmc, options::OPT_fno_jmc, false)) {
    if (TC.getTriple().isOSBinFormatELF() || D.IsCLMode()) {
      if (DebugInfoKind >= llvm::codegenoptions::DebugInfoConstructor)
        CmdArgs.push_back("-fjmc");
      else if (D.IsCLMode())
        D.Diag(clang::diag::warn_drv_jmc_requires_debuginfo) << "/JMC"
                                                             << "'/Zi', '/Z7'";
      else
        D.Diag(clang::diag::warn_drv_jmc_requires_debuginfo) << "-fjmc"
                                                             << "-g";
    } else {
      D.Diag(clang::diag::warn_drv_fjmc_for_elf_only);
    }
  }
 
  // Add in -fdebug-compilation-dir if necessary.
  const char *DebugCompilationDir =
      addDebugCompDirArg(Args, CmdArgs, D.getVFS());
 
  addDebugPrefixMapArg(D, TC, Args, CmdArgs);
 
  // Add the output path to the object file for CodeView debug infos.
  if (EmitCodeView && Output.isFilename())
    addDebugObjectName(Args, CmdArgs, DebugCompilationDir,
                       Output.getFilename());
}
 
static void ProcessVSRuntimeLibrary(const ArgList &Args,
                                    ArgStringList &CmdArgs) {
  unsigned RTOptionID = options::OPT__SLASH_MT;
 
  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();
 
  if (Arg *A = Args.getLastArg(options::OPT_fms_runtime_lib_EQ)) {
    RTOptionID = llvm::StringSwitch<unsigned>(A->getValue())
                     .Case("static", options::OPT__SLASH_MT)
                     .Case("static_dbg", options::OPT__SLASH_MTd)
                     .Case("dll", options::OPT__SLASH_MD)
                     .Case("dll_dbg", options::OPT__SLASH_MDd)
                     .Default(options::OPT__SLASH_MT);
  }
 
  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_fms_omit_default_lib)) {
    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");
  }
}
 
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;
 
  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. API extraction accepts a list of header
  // files whose API information is emitted in the output. 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 IsExtractAPI = isa<ExtractAPIJobAction>(JA);
  bool IsDeviceOffloadAction = !(JA.isDeviceOffloading(Action::OFK_None) ||
                                 JA.isDeviceOffloading(Action::OFK_Host));
  bool IsHostOffloadingAction =
      JA.isHostOffloading(Action::OFK_OpenMP) ||
      (JA.isHostOffloading(C.getActiveOffloadKinds()) &&
       Args.hasFlag(options::OPT_offload_new_driver,
                    options::OPT_no_offload_new_driver, false));
 
  bool IsRDCMode =
      Args.hasFlag(options::OPT_fgpu_rdc, options::OPT_fno_gpu_rdc, false);
  bool IsUsingLTO = D.isUsingLTO(IsDeviceOffloadAction);
  auto LTOMode = D.getLTOMode(IsDeviceOffloadAction);
 
  // Extract API doesn't have a main input file, so invent a fake one as a
  // placeholder.
  InputInfo ExtractAPIPlaceholderInput(Inputs[0].getType(), "extract-api",
                                       "extract-api");
 
  const InputInfo &Input =
      IsExtractAPI ? ExtractAPIPlaceholderInput : Inputs[0];
 
  InputInfoList ExtractAPIInputs;
  InputInfoList HostOffloadingInputs;
  const InputInfo *CudaDeviceInput = nullptr;
  const InputInfo *OpenMPDeviceInput = nullptr;
  for (const InputInfo &I : Inputs) {
    if (&I == &Input || I.getType() == types::TY_Nothing) {
      // This is the primary input or contains nothing.
    } else if (IsExtractAPI) {
      auto ExpectedInputType = ExtractAPIPlaceholderInput.getType();
      if (I.getType() != ExpectedInputType) {
        D.Diag(diag::err_drv_extract_api_wrong_kind)
            << I.getFilename() << types::getTypeName(I.getType())
            << types::getTypeName(ExpectedInputType);
      }
      ExtractAPIInputs.push_back(I);
    } else if (IsHostOffloadingAction) {
      HostOffloadingInputs.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())));
        // Unsized function arguments used for variadics were introduced in
        // CUDA-9.0. We still do not support generating code that actually uses
        // variadic arguments yet, but we do need to allow parsing them as
        // recent CUDA headers rely on that.
        // https://github.com/llvm/llvm-project/issues/58410
        if (CTC->CudaInstallation.version() >= CudaVersion::CUDA_90)
          CmdArgs.push_back("-fcuda-allow-variadic-functions");
      }
    }
    CmdArgs.push_back("-aux-triple");
    CmdArgs.push_back(Args.MakeArgString(NormalizedTriple));
 
    if (JA.isDeviceOffloading(Action::OFK_HIP) &&
        getToolChain().getTriple().isAMDGPU()) {
      // Device side compilation printf
      if (Args.getLastArg(options::OPT_mprintf_kind_EQ)) {
        CmdArgs.push_back(Args.MakeArgString(
            "-mprintf-kind=" +
            Args.getLastArgValue(options::OPT_mprintf_kind_EQ)));
        // Force compiler error on invalid conversion specifiers
        CmdArgs.push_back(
            Args.MakeArgString("-Werror=format-invalid-specifier"));
      }
    }
  }
 
  // Unconditionally claim the printf option now to avoid unused diagnostic.
  if (const Arg *PF = Args.getLastArg(options::OPT_mprintf_kind_EQ))
    PF->claim();
 
  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() || Triple.isSPIRV())
    CmdArgs.push_back("-Wspir-compat");
 
  // Select the appropriate action.
  RewriteKind rewriteKind = RK_None;
 
  bool UnifiedLTO = false;
  if (IsUsingLTO) {
    UnifiedLTO = Args.hasFlag(options::OPT_funified_lto,
                              options::OPT_fno_unified_lto, Triple.isPS());
    if (UnifiedLTO)
      CmdArgs.push_back("-funified-lto");
  }
 
  // 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);
    Args.ClaimAllArgs(options::OPT_femit_dwarf_unwind_EQ);
  }
 
  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 (JA.getType() == types::TY_PP_CXXHeaderUnit)
        CmdArgs.push_back("-fdirectives-only");
    }
  } 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("-emit-module-interface");
    else if (JA.getType() == types::TY_HeaderUnit)
      CmdArgs.push_back("-emit-header-unit");
    else
      CmdArgs.push_back("-emit-pch");
  } else if (isa<VerifyPCHJobAction>(JA)) {
    CmdArgs.push_back("-verify-pch");
  } else if (isa<ExtractAPIJobAction>(JA)) {
    assert(JA.getType() == types::TY_API_INFO &&
           "Extract API actions must generate a API information.");
    CmdArgs.push_back("-extract-api");
    if (Arg *ProductNameArg = Args.getLastArg(options::OPT_product_name_EQ))
      ProductNameArg->render(Args, CmdArgs);
    if (Arg *ExtractAPIIgnoresFileArg =
            Args.getLastArg(options::OPT_extract_api_ignores_EQ))
      ExtractAPIIgnoresFileArg->render(Args, CmdArgs);
  } 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)
              : "ifs-v1";
      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 && !JA.isDeviceOffloading(Action::OFK_OpenMP) &&
          !Args.hasFlag(options::OPT_offload_new_driver,
                        options::OPT_no_offload_new_driver, false) &&
          !Triple.isAMDGPU()) {
        D.Diag(diag::err_drv_unsupported_opt_for_target)
            << Args.getLastArg(options::OPT_foffload_lto,
                               options::OPT_foffload_lto_EQ)
                   ->getAsString(Args)
            << Triple.getTriple();
      } else if (Triple.isNVPTX() && !IsRDCMode &&
                 JA.isDeviceOffloading(Action::OFK_Cuda)) {
        D.Diag(diag::err_drv_unsupported_opt_for_language_mode)
            << Args.getLastArg(options::OPT_foffload_lto,
                               options::OPT_foffload_lto_EQ)
                   ->getAsString(Args)
            << "-fno-gpu-rdc";
      } else {
        assert(LTOMode == LTOK_Full || LTOMode == LTOK_Thin);
        CmdArgs.push_back(Args.MakeArgString(
            Twine("-flto=") + (LTOMode == LTOK_Thin ? "thin" : "full")));
        // PS4 uses the legacy LTO API, which does not support some of the
        // features enabled by -flto-unit.
        if (!RawTriple.isPS4() ||
            (D.getLTOMode() == LTOK_Full) || !UnifiedLTO)
          CmdArgs.push_back("-flto-unit");
      }
    }
  }
 
  Args.AddLastArg(CmdArgs, options::OPT_dumpdir);
 
  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);
 
  if (auto *MemProfUseArg =
          Args.getLastArg(options::OPT_fmemory_profile_use_EQ)) {
    if (MemProfArg)
      D.Diag(diag::err_drv_argument_not_allowed_with)
          << MemProfUseArg->getAsString(Args) << MemProfArg->getAsString(Args);
    if (auto *PGOInstrArg = Args.getLastArg(options::OPT_fprofile_generate,
                                            options::OPT_fprofile_generate_EQ))
      D.Diag(diag::err_drv_argument_not_allowed_with)
          << MemProfUseArg->getAsString(Args) << PGOInstrArg->getAsString(Args);
    MemProfUseArg->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 kBitcodeOptionIgnorelist[] = {
        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::is_contained(kBitcodeOptionIgnorelist, A->getOption().getID()))
        D.Diag(diag::err_drv_unsupported_embed_bitcode) << A->getSpelling();
 
    // Render the CodeGen options that need to be passed.
    Args.addOptOutFlag(CmdArgs, options::OPT_foptimize_sibling_calls,
                       options::OPT_fno_optimize_sibling_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(D, 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, D.getPrependArg()));
    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");
  CmdArgs.push_back("-clear-ast-before-backend");
 
#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) &&
        llvm::any_of(Inputs, [](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)));
  }
 
  // We support -falign-loops=N where N is a power of 2. GCC supports more
  // forms.
  if (const Arg *A = Args.getLastArg(options::OPT_falign_loops_EQ)) {
    unsigned Value = 0;
    if (StringRef(A->getValue()).getAsInteger(10, Value) || Value > 65536)
      TC.getDriver().Diag(diag::err_drv_invalid_int_value)
          << A->getAsString(Args) << A->getValue();
    else if (Value & (Value - 1))
      TC.getDriver().Diag(diag::err_drv_alignment_not_power_of_two)
          << A->getAsString(Args) << A->getValue();
    // Treat =0 as unspecified (use the target preference).
    if (Value)
      CmdArgs.push_back(Args.MakeArgString("-falign-loops=" +
                                           Twine(std::min(Value, 65536u))));
  }
 
  if (Triple.isOSzOS()) {
    // On z/OS some of the system header feature macros need to
    // be defined to enable most cross platform projects to build
    // successfully.  Ths include the libc++ library.  A
    // complicating factor is that users can define these
    // macros to the same or different values.  We need to add
    // the definition for these macros to the compilation command
    // if the user hasn't already defined them.
 
    auto findMacroDefinition = [&](const std::string &Macro) {
      auto MacroDefs = Args.getAllArgValues(options::OPT_D);
      return std::find_if(MacroDefs.begin(), MacroDefs.end(),
                          [&](const std::string &M) {
                            return M == Macro ||
                                   M.find(Macro + '=') != std::string::npos;
                          }) != MacroDefs.end();
    };
 
    // _UNIX03_WITHDRAWN is required for libcxx & porting.
    if (!findMacroDefinition("_UNIX03_WITHDRAWN"))
      CmdArgs.push_back("-D_UNIX03_WITHDRAWN");
    // _OPEN_DEFAULT is required for XL compat
    if (!findMacroDefinition("_OPEN_DEFAULT"))
      CmdArgs.push_back("-D_OPEN_DEFAULT");
    if (D.CCCIsCXX() || types::isCXX(Input.getType())) {
      // _XOPEN_SOURCE=600 is required for libcxx.
      if (!findMacroDefinition("_XOPEN_SOURCE"))
        CmdArgs.push_back("-D_XOPEN_SOURCE=600");
    }
  }
 
  llvm::Reloc::Model RelocationModel;
  unsigned PICLevel;
  bool IsPIE;
  std::tie(RelocationModel, PICLevel, IsPIE) = ParsePICArgs(TC, Args);
  Arg *LastPICDataRelArg =
      Args.getLastArg(options::OPT_mno_pic_data_is_text_relative,
                      options::OPT_mpic_data_is_text_relative);
  bool NoPICDataIsTextRelative = false;
  if (LastPICDataRelArg) {
    if (LastPICDataRelArg->getOption().matches(
            options::OPT_mno_pic_data_is_text_relative)) {
      NoPICDataIsTextRelative = true;
      if (!PICLevel)
        D.Diag(diag::err_drv_argument_only_allowed_with)
            << "-mno-pic-data-is-text-relative"
            << "-fpic/-fpie";
    }
    if (!Triple.isSystemZ())
      D.Diag(diag::err_drv_unsupported_opt_for_target)
          << (NoPICDataIsTextRelative ? "-mno-pic-data-is-text-relative"
                                      : "-mpic-data-is-text-relative")
          << RawTriple.str();
  }
 
  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 (NoPICDataIsTextRelative)
      CmdArgs.push_back("-mcmodel=medium");
  }
 
  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));
    }
  }
 
  if (Arg *A = Args.getLastArg(options::OPT_fveclib)) {
    StringRef Name = A->getValue();
    if (Name == "SVML") {
      if (Triple.getArch() != llvm::Triple::x86 &&
          Triple.getArch() != llvm::Triple::x86_64)
        D.Diag(diag::err_drv_unsupported_opt_for_target)
            << Name << Triple.getArchName();
    } else if (Name == "LIBMVEC-X86") {
      if (Triple.getArch() != llvm::Triple::x86 &&
          Triple.getArch() != llvm::Triple::x86_64)
        D.Diag(diag::err_drv_unsupported_opt_for_target)
            << Name << Triple.getArchName();
    } else if (Name == "SLEEF" || Name == "ArmPL") {
      if (Triple.getArch() != llvm::Triple::aarch64 &&
          Triple.getArch() != llvm::Triple::aarch64_be)
        D.Diag(diag::err_drv_unsupported_opt_for_target)
            << Name << Triple.getArchName();
    }
    A->render(Args, CmdArgs);
  }
 
  if (Args.hasFlag(options::OPT_fmerge_all_constants,
                   options::OPT_fno_merge_all_constants, false))
    CmdArgs.push_back("-fmerge-all-constants");
 
  Args.addOptOutFlag(CmdArgs, options::OPT_fdelete_null_pointer_checks,
                     options::OPT_fno_delete_null_pointer_checks);
 
  // LLVM Code Generator Options.
 
  if (Arg *A = Args.getLastArg(options::OPT_mabi_EQ_quadword_atomics)) {
    if (!Triple.isOSAIX() || Triple.isPPC32())
      D.Diag(diag::err_drv_unsupported_opt_for_target)
        << A->getSpelling() << RawTriple.str();
    CmdArgs.push_back("-mabi=quadword-atomics");
  }
 
  if (Arg *A = Args.getLastArg(options::OPT_mlong_double_128)) {
    // Emit the unsupported option error until the Clang's library integration
    // support for 128-bit long double is available for AIX.
    if (Triple.isOSAIX())
      D.Diag(diag::err_drv_unsupported_opt_for_target)
          << A->getSpelling() << RawTriple.str();
  }
 
  if (Arg *A = Args.getLastArg(options::OPT_Wframe_larger_than_EQ)) {
    StringRef V = A->getValue(), V1 = V;
    unsigned Size;
    if (V1.consumeInteger(10, Size) || !V1.empty())
      D.Diag(diag::err_drv_invalid_argument_to_option)
          << V << A->getOption().getName();
    else
      CmdArgs.push_back(Args.MakeArgString("-fwarn-stack-size=" + V));
  }
 
  Args.addOptOutFlag(CmdArgs, options::OPT_fjump_tables,
                     options::OPT_fno_jump_tables);
  Args.addOptInFlag(CmdArgs, options::OPT_fprofile_sample_accurate,
                    options::OPT_fno_profile_sample_accurate);
  Args.addOptOutFlag(CmdArgs, options::OPT_fpreserve_as_comments,
                     options::OPT_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);
 
  Args.addOptOutFlag(CmdArgs, options::OPT_fzero_initialized_in_bss,
                     options::OPT_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, true))
    CmdArgs.push_back("-no-struct-path-tbaa");
  Args.addOptInFlag(CmdArgs, options::OPT_fstrict_enums,
                    options::OPT_fno_strict_enums);
  Args.addOptOutFlag(CmdArgs, options::OPT_fstrict_return,
                     options::OPT_fno_strict_return);
  Args.addOptInFlag(CmdArgs, options::OPT_fallow_editor_placeholders,
                    options::OPT_fno_allow_editor_placeholders);
  Args.addOptInFlag(CmdArgs, options::OPT_fstrict_vtable_pointers,
                    options::OPT_fno_strict_vtable_pointers);
  Args.addOptInFlag(CmdArgs, options::OPT_fforce_emit_vtables,
                    options::OPT_fno_force_emit_vtables);
  Args.addOptOutFlag(CmdArgs, options::OPT_foptimize_sibling_calls,
                     options::OPT_fno_optimize_sibling_calls);
  Args.addOptOutFlag(CmdArgs, options::OPT_fescaping_block_tail_calls,
                     options::OPT_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);
 
  Args.AddLastArg(CmdArgs, options::OPT_fexperimental_omit_vtable_rtti,
                  options::OPT_fno_experimental_omit_vtable_rtti);
 
  // Handle segmented stacks.
  Args.addOptInFlag(CmdArgs, options::OPT_fsplit_stack,
                    options::OPT_fno_split_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 toolchain choose to use MCAsmParser for inline asm don't pass the
  // option to disable integrated-as explictly.
  if (!TC.useIntegratedAs() && !TC.parseInlineAsmUsingAsmParser())
    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 https://openradar.appspot.com/7198997), and CUDA device
  // code, where aliases aren't supported.
  if (!RawTriple.isOSDarwin() && !RawTriple.isNVPTX())
    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");
  }
 
  if (Triple.isWindowsGNUEnvironment()) {
    Args.addOptOutFlag(CmdArgs, options::OPT_fauto_import,
                       options::OPT_fno_auto_import);
  }
 
  // 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");
 
  Args.AddLastArg(CmdArgs, options::OPT_fno_knr_functions);
 
  // This is a coarse approximation of what llvm-gcc actually does, both
  // -fasynchronous-unwind-tables and -fnon-call-exceptions interact in more
  // complicated ways.
  auto SanitizeArgs = TC.getSanitizerArgs(Args);
 
  bool IsAsyncUnwindTablesDefault =
      TC.getDefaultUnwindTableLevel(Args) == ToolChain::UnwindTableLevel::Asynchronous;
  bool IsSyncUnwindTablesDefault =
      TC.getDefaultUnwindTableLevel(Args) == ToolChain::UnwindTableLevel::Synchronous;
 
  bool AsyncUnwindTables = Args.hasFlag(
      options::OPT_fasynchronous_unwind_tables,
      options::OPT_fno_asynchronous_unwind_tables,
      (IsAsyncUnwindTablesDefault || SanitizeArgs.needsUnwindTables()) &&
          !Freestanding);
  bool UnwindTables =
      Args.hasFlag(options::OPT_funwind_tables, options::OPT_fno_unwind_tables,
                   IsSyncUnwindTablesDefault && !Freestanding);
  if (AsyncUnwindTables)
    CmdArgs.push_back("-funwind-tables=2");
  else if (UnwindTables)
     CmdArgs.push_back("-funwind-tables=1");
 
  // 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(D, 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());
 
  if (Arg *A = Args.getLastArg(options::OPT_mcmodel_EQ)) {
    StringRef CM = A->getValue();
    if (CM == "small" || CM == "kernel" || CM == "medium" || CM == "large" ||
        CM == "tiny") {
      if (Triple.isOSAIX() && CM == "medium")
        CmdArgs.push_back("-mcmodel=large");
      else if (Triple.isAArch64() && (CM == "kernel" || CM == "medium"))
        D.Diag(diag::err_drv_invalid_argument_to_option)
            << CM << A->getOption().getName();
      else
        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_mlarge_data_threshold_EQ)) {
    if (!Triple.isX86()) {
      D.Diag(diag::err_drv_unsupported_opt_for_target)
          << A->getOption().getName() << TripleStr;
    } else {
      bool IsMediumCM = false;
      if (Arg *A = Args.getLastArg(options::OPT_mcmodel_EQ))
        IsMediumCM = StringRef(A->getValue()) == "medium";
      if (!IsMediumCM) {
        D.Diag(diag::warn_drv_large_data_threshold_invalid_code_model)
            << A->getOption().getRenderName();
      } else {
        A->render(Args, CmdArgs);
      }
    }
  }
 
  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(D, Args, Triple, /*FromAs*/ false);
  if (!CPU.empty()) {
    CmdArgs.push_back("-target-cpu");
    CmdArgs.push_back(Args.MakeArgString(CPU));
  }
 
  RenderTargetOptions(Triple, Args, KernelOrKext, CmdArgs);
 
  // Add clang-cl arguments.
  types::ID InputType = Input.getType();
  if (D.IsCLMode())
    AddClangCLArgs(Args, InputType, CmdArgs);
 
  llvm::codegenoptions::DebugInfoKind DebugInfoKind =
      llvm::codegenoptions::NoDebugInfo;
  DwarfFissionKind DwarfFission = DwarfFissionKind::None;
  renderDebugOptions(TC, D, RawTriple, Args, types::isLLVMIR(InputType),
                     CmdArgs, Output, 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() ||
                     TC.getTriple().isOSBinFormatCOFF()) &&
                    (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.CCPrintHeadersFormat && !D.CCGenDiagnostics) {
    CmdArgs.push_back("-header-include-file");
    CmdArgs.push_back(!D.CCPrintHeadersFilename.empty()
                          ? D.CCPrintHeadersFilename.c_str()
                          : "-");
    CmdArgs.push_back("-sys-header-deps");
    CmdArgs.push_back(Args.MakeArgString(
        "-header-include-format=" +
        std::string(headerIncludeFormatKindToString(D.CCPrintHeadersFormat))));
    CmdArgs.push_back(
        Args.MakeArgString("-header-include-filtering=" +
                           std::string(headerIncludeFilteringKindToString(
                               D.CCPrintHeadersFiltering))));
  }
  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");
  }
 
  Args.addOptOutFlag(CmdArgs, options::OPT_funique_section_names,
                     options::OPT_fno_unique_section_names);
  Args.addOptInFlag(CmdArgs, options::OPT_funique_internal_linkage_names,
                    options::OPT_fno_unique_internal_linkage_names);
  Args.addOptInFlag(CmdArgs, options::OPT_funique_basic_block_section_names,
                    options::OPT_fno_unique_basic_block_section_names);
  Args.addOptInFlag(CmdArgs, options::OPT_fconvergent_functions,
                    options::OPT_fno_convergent_functions);
 
  if (Arg *A = Args.getLastArg(options::OPT_fsplit_machine_functions,
                               options::OPT_fno_split_machine_functions)) {
    if (!A->getOption().matches(options::OPT_fno_split_machine_functions)) {
      // This codegen pass is only available on x86 and AArch64 ELF targets.
      if ((Triple.isX86() || Triple.isAArch64()) && Triple.isOSBinFormatELF())
        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, JA, Output, Args, SanitizeArgs, CmdArgs);
 
  Args.AddLastArg(CmdArgs, options::OPT_fclang_abi_compat_EQ);
 
  if (getLastProfileSampleUseArg(Args) &&
      Args.hasArg(options::OPT_fsample_profile_use_profi)) {
    CmdArgs.push_back("-mllvm");
    CmdArgs.push_back("-sample-profile-use-profi");
  }
 
  // Add runtime flag for PS4/PS5 when PGO, coverage, or sanitizers are enabled.
  if (RawTriple.isPS() &&
      !Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
    PScpu::addProfileRTArgs(TC, Args, CmdArgs);
    PScpu::addSanitizerArgs(TC, Args, 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("-n