Remove LLVM 8.0.1 files.

1 files changed, 0 insertions, 2655 deletions

diff --git a/gnu/llvm/tools/clang/lib/Driver/ToolChains/Gnu.cpp b/gnu/llvm/tools/clang/lib/Driver/ToolChains/Gnu.cpp
deleted file mode 100644
index e4b35890199..00000000000
--- a/gnu/llvm/tools/clang/lib/Driver/ToolChains/Gnu.cpp
+++ /dev/null
@@ -1,2655 +0,0 @@
-//===--- Gnu.cpp - Gnu Tool and ToolChain Implementations -------*- C++ -*-===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-
-#include "Gnu.h"
-#include "Arch/ARM.h"
-#include "Arch/Mips.h"
-#include "Arch/PPC.h"
-#include "Arch/RISCV.h"
-#include "Arch/Sparc.h"
-#include "Arch/SystemZ.h"
-#include "CommonArgs.h"
-#include "Linux.h"
-#include "clang/Config/config.h" // for GCC_INSTALL_PREFIX
-#include "clang/Driver/Compilation.h"
-#include "clang/Driver/Driver.h"
-#include "clang/Driver/DriverDiagnostic.h"
-#include "clang/Driver/Options.h"
-#include "clang/Driver/Tool.h"
-#include "llvm/Option/ArgList.h"
-#include "llvm/Support/CodeGen.h"
-#include "llvm/Support/Path.h"
-#include "llvm/Support/TargetParser.h"
-#include "llvm/Support/VirtualFileSystem.h"
-#include <system_error>
-
-using namespace clang::driver;
-using namespace clang::driver::toolchains;
-using namespace clang;
-using namespace llvm::opt;
-
-void tools::GnuTool::anchor() {}
-
-static bool forwardToGCC(const Option &O) {
-  // Don't forward inputs from the original command line.  They are added from
-  // InputInfoList.
-  return O.getKind() != Option::InputClass &&
-         !O.hasFlag(options::DriverOption) && !O.hasFlag(options::LinkerInput);
-}
-
-// Switch CPU names not recognized by GNU assembler to a close CPU that it does
-// recognize, instead of a lower march from being picked in the absence of a cpu
-// flag.
-static void normalizeCPUNamesForAssembler(const ArgList &Args,
-                                          ArgStringList &CmdArgs) {
-  if (Arg *A = Args.getLastArg(options::OPT_mcpu_EQ)) {
-    StringRef CPUArg(A->getValue());
-    if (CPUArg.equals_lower("krait"))
-      CmdArgs.push_back("-mcpu=cortex-a15");
-    else if(CPUArg.equals_lower("kryo"))
-      CmdArgs.push_back("-mcpu=cortex-a57");
-    else
-      Args.AddLastArg(CmdArgs, options::OPT_mcpu_EQ);
-  }
-}
-
-void tools::gcc::Common::ConstructJob(Compilation &C, const JobAction &JA,
-                                      const InputInfo &Output,
-                                      const InputInfoList &Inputs,
-                                      const ArgList &Args,
-                                      const char *LinkingOutput) const {
-  const Driver &D = getToolChain().getDriver();
-  ArgStringList CmdArgs;
-
-  for (const auto &A : Args) {
-    if (forwardToGCC(A->getOption())) {
-      // It is unfortunate that we have to claim here, as this means
-      // we will basically never report anything interesting for
-      // platforms using a generic gcc, even if we are just using gcc
-      // to get to the assembler.
-      A->claim();
-
-      // Don't forward any -g arguments to assembly steps.
-      if (isa<AssembleJobAction>(JA) &&
-          A->getOption().matches(options::OPT_g_Group))
-        continue;
-
-      // Don't forward any -W arguments to assembly and link steps.
-      if ((isa<AssembleJobAction>(JA) || isa<LinkJobAction>(JA)) &&
-          A->getOption().matches(options::OPT_W_Group))
-        continue;
-
-      // Don't forward -mno-unaligned-access since GCC doesn't understand
-      // it and because it doesn't affect the assembly or link steps.
-      if ((isa<AssembleJobAction>(JA) || isa<LinkJobAction>(JA)) &&
-          (A->getOption().matches(options::OPT_munaligned_access) ||
-           A->getOption().matches(options::OPT_mno_unaligned_access)))
-        continue;
-
-      A->render(Args, CmdArgs);
-    }
-  }
-
-  RenderExtraToolArgs(JA, CmdArgs);
-
-  // If using a driver driver, force the arch.
-  if (getToolChain().getTriple().isOSDarwin()) {
-    CmdArgs.push_back("-arch");
-    CmdArgs.push_back(
-        Args.MakeArgString(getToolChain().getDefaultUniversalArchName()));
-  }
-
-  // Try to force gcc to match the tool chain we want, if we recognize
-  // the arch.
-  //
-  // FIXME: The triple class should directly provide the information we want
-  // here.
-  switch (getToolChain().getArch()) {
-  default:
-    break;
-  case llvm::Triple::x86:
-  case llvm::Triple::ppc:
-    CmdArgs.push_back("-m32");
-    break;
-  case llvm::Triple::x86_64:
-  case llvm::Triple::ppc64:
-  case llvm::Triple::ppc64le:
-    CmdArgs.push_back("-m64");
-    break;
-  case llvm::Triple::sparcel:
-    CmdArgs.push_back("-EL");
-    break;
-  }
-
-  if (Output.isFilename()) {
-    CmdArgs.push_back("-o");
-    CmdArgs.push_back(Output.getFilename());
-  } else {
-    assert(Output.isNothing() && "Unexpected output");
-    CmdArgs.push_back("-fsyntax-only");
-  }
-
-  Args.AddAllArgValues(CmdArgs, options::OPT_Wa_COMMA, options::OPT_Xassembler);
-
-  // Only pass -x if gcc will understand it; otherwise hope gcc
-  // understands the suffix correctly. The main use case this would go
-  // wrong in is for linker inputs if they happened to have an odd
-  // suffix; really the only way to get this to happen is a command
-  // like '-x foobar a.c' which will treat a.c like a linker input.
-  //
-  // FIXME: For the linker case specifically, can we safely convert
-  // inputs into '-Wl,' options?
-  for (const auto &II : Inputs) {
-    // Don't try to pass LLVM or AST inputs to a generic gcc.
-    if (types::isLLVMIR(II.getType()))
-      D.Diag(clang::diag::err_drv_no_linker_llvm_support)
-          << getToolChain().getTripleString();
-    else if (II.getType() == types::TY_AST)
-      D.Diag(diag::err_drv_no_ast_support) << getToolChain().getTripleString();
-    else if (II.getType() == types::TY_ModuleFile)
-      D.Diag(diag::err_drv_no_module_support)
-          << getToolChain().getTripleString();
-
-    if (types::canTypeBeUserSpecified(II.getType())) {
-      CmdArgs.push_back("-x");
-      CmdArgs.push_back(types::getTypeName(II.getType()));
-    }
-
-    if (II.isFilename())
-      CmdArgs.push_back(II.getFilename());
-    else {
-      const Arg &A = II.getInputArg();
-
-      // Reverse translate some rewritten options.
-      if (A.getOption().matches(options::OPT_Z_reserved_lib_stdcxx)) {
-        CmdArgs.push_back("-lstdc++");
-        continue;
-      }
-
-      // Don't render as input, we need gcc to do the translations.
-      A.render(Args, CmdArgs);
-    }
-  }
-
-  const std::string &customGCCName = D.getCCCGenericGCCName();
-  const char *GCCName;
-  if (!customGCCName.empty())
-    GCCName = customGCCName.c_str();
-  else if (D.CCCIsCXX()) {
-    GCCName = "g++";
-  } else
-    GCCName = "gcc";
-
-  const char *Exec = Args.MakeArgString(getToolChain().GetProgramPath(GCCName));
-  C.addCommand(llvm::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));
-}
-
-void tools::gcc::Preprocessor::RenderExtraToolArgs(
-    const JobAction &JA, ArgStringList &CmdArgs) const {
-  CmdArgs.push_back("-E");
-}
-
-void tools::gcc::Compiler::RenderExtraToolArgs(const JobAction &JA,
-                                               ArgStringList &CmdArgs) const {
-  const Driver &D = getToolChain().getDriver();
-
-  switch (JA.getType()) {
-  // If -flto, etc. are present then make sure not to force assembly output.
-  case types::TY_LLVM_IR:
-  case types::TY_LTO_IR:
-  case types::TY_LLVM_BC:
-  case types::TY_LTO_BC:
-    CmdArgs.push_back("-c");
-    break;
-  // We assume we've got an "integrated" assembler in that gcc will produce an
-  // object file itself.
-  case types::TY_Object:
-    CmdArgs.push_back("-c");
-    break;
-  case types::TY_PP_Asm:
-    CmdArgs.push_back("-S");
-    break;
-  case types::TY_Nothing:
-    CmdArgs.push_back("-fsyntax-only");
-    break;
-  default:
-    D.Diag(diag::err_drv_invalid_gcc_output_type) << getTypeName(JA.getType());
-  }
-}
-
-void tools::gcc::Linker::RenderExtraToolArgs(const JobAction &JA,
-                                             ArgStringList &CmdArgs) const {
-  // The types are (hopefully) good enough.
-}
-
-// On Arm the endianness of the output file is determined by the target and
-// can be overridden by the pseudo-target flags '-mlittle-endian'/'-EL' and
-// '-mbig-endian'/'-EB'. Unlike other targets the flag does not result in a
-// normalized triple so we must handle the flag here.
-static bool isArmBigEndian(const llvm::Triple &Triple,
-                           const ArgList &Args) {
-  bool IsBigEndian = false;
-  switch (Triple.getArch()) {
-  case llvm::Triple::armeb:
-  case llvm::Triple::thumbeb:
-    IsBigEndian = true;
-    LLVM_FALLTHROUGH;
-  case llvm::Triple::arm:
-  case llvm::Triple::thumb:
-    if (Arg *A = Args.getLastArg(options::OPT_mlittle_endian,
-                               options::OPT_mbig_endian))
-      IsBigEndian = !A->getOption().matches(options::OPT_mlittle_endian);
-    break;
-  default:
-    break;
-  }
-  return IsBigEndian;
-}
-
-static const char *getLDMOption(const llvm::Triple &T, const ArgList &Args) {
-  switch (T.getArch()) {
-  case llvm::Triple::x86:
-    if (T.isOSIAMCU())
-      return "elf_iamcu";
-    return "elf_i386";
-  case llvm::Triple::aarch64:
-    return "aarch64linux";
-  case llvm::Triple::aarch64_be:
-    return "aarch64linuxb";
-  case llvm::Triple::arm:
-  case llvm::Triple::thumb:
-  case llvm::Triple::armeb:
-  case llvm::Triple::thumbeb:
-    return isArmBigEndian(T, Args) ? "armelfb_linux_eabi" : "armelf_linux_eabi";
-  case llvm::Triple::ppc:
-    return "elf32ppclinux";
-  case llvm::Triple::ppc64:
-    return "elf64ppc";
-  case llvm::Triple::ppc64le:
-    return "elf64lppc";
-  case llvm::Triple::riscv32:
-    return "elf32lriscv";
-  case llvm::Triple::riscv64:
-    return "elf64lriscv";
-  case llvm::Triple::sparc:
-  case llvm::Triple::sparcel:
-    return "elf32_sparc";
-  case llvm::Triple::sparcv9:
-    return "elf64_sparc";
-  case llvm::Triple::mips:
-    return "elf32btsmip";
-  case llvm::Triple::mipsel:
-    return "elf32ltsmip";
-  case llvm::Triple::mips64:
-    if (tools::mips::hasMipsAbiArg(Args, "n32") ||
-        T.getEnvironment() == llvm::Triple::GNUABIN32)
-      return "elf32btsmipn32";
-    return "elf64btsmip";
-  case llvm::Triple::mips64el:
-    if (tools::mips::hasMipsAbiArg(Args, "n32") ||
-        T.getEnvironment() == llvm::Triple::GNUABIN32)
-      return "elf32ltsmipn32";
-    return "elf64ltsmip";
-  case llvm::Triple::systemz:
-    return "elf64_s390";
-  case llvm::Triple::x86_64:
-    if (T.getEnvironment() == llvm::Triple::GNUX32)
-      return "elf32_x86_64";
-    return "elf_x86_64";
-  default:
-    return nullptr;
-  }
-}
-
-static bool getPIE(const ArgList &Args, const toolchains::Linux &ToolChain) {
-  if (Args.hasArg(options::OPT_shared) || Args.hasArg(options::OPT_static) ||
-      Args.hasArg(options::OPT_r))
-    return false;
-
-  Arg *A = Args.getLastArg(options::OPT_pie, options::OPT_no_pie,
-                           options::OPT_nopie);
-  if (!A)
-    return ToolChain.isPIEDefault();
-  return A->getOption().matches(options::OPT_pie);
-}
-
-void tools::gnutools::Linker::ConstructJob(Compilation &C, const JobAction &JA,
-                                           const InputInfo &Output,
-                                           const InputInfoList &Inputs,
-                                           const ArgList &Args,
-                                           const char *LinkingOutput) const {
-  const toolchains::Linux &ToolChain =
-      static_cast<const toolchains::Linux &>(getToolChain());
-  const Driver &D = ToolChain.getDriver();
-
-  const llvm::Triple &Triple = getToolChain().getEffectiveTriple();
-
-  const llvm::Triple::ArchType Arch = ToolChain.getArch();
-  const bool isAndroid = ToolChain.getTriple().isAndroid();
-  const bool IsIAMCU = ToolChain.getTriple().isOSIAMCU();
-  const bool IsPIE = getPIE(Args, ToolChain);
-  const bool HasCRTBeginEndFiles =
-      ToolChain.getTriple().hasEnvironment() ||
-      (ToolChain.getTriple().getVendor() != llvm::Triple::MipsTechnologies);
-
-  ArgStringList CmdArgs;
-
-  // Silence warning for "clang -g foo.o -o foo"
-  Args.ClaimAllArgs(options::OPT_g_Group);
-  // and "clang -emit-llvm foo.o -o foo"
-  Args.ClaimAllArgs(options::OPT_emit_llvm);
-  // and for "clang -w foo.o -o foo". Other warning options are already
-  // handled somewhere else.
-  Args.ClaimAllArgs(options::OPT_w);
-
-  if (!D.SysRoot.empty())
-    CmdArgs.push_back(Args.MakeArgString("--sysroot=" + D.SysRoot));
-
-  if (IsPIE)
-    CmdArgs.push_back("-pie");
-
-  if (Args.hasArg(options::OPT_rdynamic))
-    CmdArgs.push_back("-export-dynamic");
-
-  if (Args.hasArg(options::OPT_s))
-    CmdArgs.push_back("-s");
-
-  if (Triple.isARM() || Triple.isThumb() || Triple.isAArch64()) {
-    bool IsBigEndian = isArmBigEndian(Triple, Args);
-    if (IsBigEndian)
-      arm::appendBE8LinkFlag(Args, CmdArgs, Triple);
-    IsBigEndian = IsBigEndian || Arch == llvm::Triple::aarch64_be;
-    CmdArgs.push_back(IsBigEndian ? "-EB" : "-EL");
-  }
-
-  // Most Android ARM64 targets should enable the linker fix for erratum
-  // 843419. Only non-Cortex-A53 devices are allowed to skip this flag.
-  if (Arch == llvm::Triple::aarch64 && isAndroid) {
-    std::string CPU = getCPUName(Args, Triple);
-    if (CPU.empty() || CPU == "generic" || CPU == "cortex-a53")
-      CmdArgs.push_back("--fix-cortex-a53-843419");
-  }
-
-  for (const auto &Opt : ToolChain.ExtraOpts)
-    CmdArgs.push_back(Opt.c_str());
-
-  CmdArgs.push_back("--eh-frame-hdr");
-
-  if (const char *LDMOption = getLDMOption(ToolChain.getTriple(), Args)) {
-    CmdArgs.push_back("-m");
-    CmdArgs.push_back(LDMOption);
-  } else {
-    D.Diag(diag::err_target_unknown_triple) << Triple.str();
-    return;
-  }
-
-  if (Args.hasArg(options::OPT_static)) {
-    if (Arch == llvm::Triple::arm || Arch == llvm::Triple::armeb ||
-        Arch == llvm::Triple::thumb || Arch == llvm::Triple::thumbeb)
-      CmdArgs.push_back("-Bstatic");
-    else
-      CmdArgs.push_back("-static");
-  } else if (Args.hasArg(options::OPT_shared)) {
-    CmdArgs.push_back("-shared");
-  }
-
-  if (!Args.hasArg(options::OPT_static)) {
-    if (Args.hasArg(options::OPT_rdynamic))
-      CmdArgs.push_back("-export-dynamic");
-
-    if (!Args.hasArg(options::OPT_shared)) {
-      const std::string Loader =
-          D.DyldPrefix + ToolChain.getDynamicLinker(Args);
-      CmdArgs.push_back("-dynamic-linker");
-      CmdArgs.push_back(Args.MakeArgString(Loader));
-    }
-  }
-
-  CmdArgs.push_back("-o");
-  CmdArgs.push_back(Output.getFilename());
-
-  if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles)) {
-    if (!isAndroid && !IsIAMCU) {
-      const char *crt1 = nullptr;
-      if (!Args.hasArg(options::OPT_shared)) {
-        if (Args.hasArg(options::OPT_pg))
-          crt1 = "gcrt1.o";
-        else if (IsPIE)
-          crt1 = "Scrt1.o";
-        else
-          crt1 = "crt1.o";
-      }
-      if (crt1)
-        CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crt1)));
-
-      CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crti.o")));
-    }
-
-    if (IsIAMCU)
-      CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crt0.o")));
-    else {
-      const char *crtbegin;
-      if (Args.hasArg(options::OPT_static))
-        crtbegin = isAndroid ? "crtbegin_static.o" : "crtbeginT.o";
-      else if (Args.hasArg(options::OPT_shared))
-        crtbegin = isAndroid ? "crtbegin_so.o" : "crtbeginS.o";
-      else if (IsPIE)
-        crtbegin = isAndroid ? "crtbegin_dynamic.o" : "crtbeginS.o";
-      else
-        crtbegin = isAndroid ? "crtbegin_dynamic.o" : "crtbegin.o";
-
-      if (HasCRTBeginEndFiles)
-        CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtbegin)));
-    }
-
-    // Add crtfastmath.o if available and fast math is enabled.
-    ToolChain.AddFastMathRuntimeIfAvailable(Args, CmdArgs);
-  }
-
-  Args.AddAllArgs(CmdArgs, options::OPT_L);
-  Args.AddAllArgs(CmdArgs, options::OPT_u);
-
-  ToolChain.AddFilePathLibArgs(Args, CmdArgs);
-
-  if (D.isUsingLTO()) {
-    assert(!Inputs.empty() && "Must have at least one input.");
-    AddGoldPlugin(ToolChain, Args, CmdArgs, Output, Inputs[0],
-                  D.getLTOMode() == LTOK_Thin);
-  }
-
-  if (Args.hasArg(options::OPT_Z_Xlinker__no_demangle))
-    CmdArgs.push_back("--no-demangle");
-
-  bool NeedsSanitizerDeps = addSanitizerRuntimes(ToolChain, Args, CmdArgs);
-  bool NeedsXRayDeps = addXRayRuntime(ToolChain, Args, CmdArgs);
-  AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);
-  // The profile runtime also needs access to system libraries.
-  getToolChain().addProfileRTLibs(Args, CmdArgs);
-
-  if (D.CCCIsCXX() &&
-      !Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
-    if (ToolChain.ShouldLinkCXXStdlib(Args)) {
-      bool OnlyLibstdcxxStatic = Args.hasArg(options::OPT_static_libstdcxx) &&
-                                 !Args.hasArg(options::OPT_static);
-      if (OnlyLibstdcxxStatic)
-        CmdArgs.push_back("-Bstatic");
-      ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
-      if (OnlyLibstdcxxStatic)
-        CmdArgs.push_back("-Bdynamic");
-    }
-    CmdArgs.push_back("-lm");
-  }
-  // Silence warnings when linking C code with a C++ '-stdlib' argument.
-  Args.ClaimAllArgs(options::OPT_stdlib_EQ);
-
-  if (!Args.hasArg(options::OPT_nostdlib)) {
-    if (!Args.hasArg(options::OPT_nodefaultlibs)) {
-      if (Args.hasArg(options::OPT_static))
-        CmdArgs.push_back("--start-group");
-
-      if (NeedsSanitizerDeps)
-        linkSanitizerRuntimeDeps(ToolChain, CmdArgs);
-
-      if (NeedsXRayDeps)
-        linkXRayRuntimeDeps(ToolChain, CmdArgs);
-
-      bool WantPthread = Args.hasArg(options::OPT_pthread) ||
-                         Args.hasArg(options::OPT_pthreads);
-
-      // FIXME: Only pass GompNeedsRT = true for platforms with libgomp that
-      // require librt. Most modern Linux platforms do, but some may not.
-      if (addOpenMPRuntime(CmdArgs, ToolChain, Args,
-                           JA.isHostOffloading(Action::OFK_OpenMP),
-                           /* GompNeedsRT= */ true))
-        // OpenMP runtimes implies pthreads when using the GNU toolchain.
-        // FIXME: Does this really make sense for all GNU toolchains?
-        WantPthread = true;
-
-      AddRunTimeLibs(ToolChain, D, CmdArgs, Args);
-
-      if (WantPthread && !isAndroid)
-        CmdArgs.push_back("-lpthread");
-
-      if (Args.hasArg(options::OPT_fsplit_stack))
-        CmdArgs.push_back("--wrap=pthread_create");
-
-      CmdArgs.push_back("-lc");
-
-      // Add IAMCU specific libs, if needed.
-      if (IsIAMCU)
-        CmdArgs.push_back("-lgloss");
-
-      if (Args.hasArg(options::OPT_static))
-        CmdArgs.push_back("--end-group");
-      else
-        AddRunTimeLibs(ToolChain, D, CmdArgs, Args);
-
-      // Add IAMCU specific libs (outside the group), if needed.
-      if (IsIAMCU) {
-        CmdArgs.push_back("--as-needed");
-        CmdArgs.push_back("-lsoftfp");
-        CmdArgs.push_back("--no-as-needed");
-      }
-    }
-
-    if (!Args.hasArg(options::OPT_nostartfiles) && !IsIAMCU) {
-      const char *crtend;
-      if (Args.hasArg(options::OPT_shared))
-        crtend = isAndroid ? "crtend_so.o" : "crtendS.o";
-      else if (IsPIE)
-        crtend = isAndroid ? "crtend_android.o" : "crtendS.o";
-      else
-        crtend = isAndroid ? "crtend_android.o" : "crtend.o";
-
-      if (HasCRTBeginEndFiles)
-        CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtend)));
-      if (!isAndroid)
-        CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crtn.o")));
-    }
-  }
-
-  // Add OpenMP offloading linker script args if required.
-  AddOpenMPLinkerScript(getToolChain(), C, Output, Inputs, Args, CmdArgs, JA);
-
-  // Add HIP offloading linker script args if required.
-  AddHIPLinkerScript(getToolChain(), C, Output, Inputs, Args, CmdArgs, JA,
-                     *this);
-
-  const char *Exec = Args.MakeArgString(ToolChain.GetLinkerPath());
-  C.addCommand(llvm::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));
-}
-
-void tools::gnutools::Assembler::ConstructJob(Compilation &C,
-                                              const JobAction &JA,
-                                              const InputInfo &Output,
-                                              const InputInfoList &Inputs,
-                                              const ArgList &Args,
-                                              const char *LinkingOutput) const {
-  const auto &D = getToolChain().getDriver();
-
-  claimNoWarnArgs(Args);
-
-  ArgStringList CmdArgs;
-
-  llvm::Reloc::Model RelocationModel;
-  unsigned PICLevel;
-  bool IsPIE;
-  std::tie(RelocationModel, PICLevel, IsPIE) =
-      ParsePICArgs(getToolChain(), Args);
-
-  if (const Arg *A = Args.getLastArg(options::OPT_gz, options::OPT_gz_EQ)) {
-    if (A->getOption().getID() == options::OPT_gz) {
-      CmdArgs.push_back("-compress-debug-sections");
-    } else {
-      StringRef Value = A->getValue();
-      if (Value == "none") {
-        CmdArgs.push_back("-compress-debug-sections=none");
-      } else if (Value == "zlib" || Value == "zlib-gnu") {
-        CmdArgs.push_back(
-            Args.MakeArgString("-compress-debug-sections=" + Twine(Value)));
-      } else {
-        D.Diag(diag::err_drv_unsupported_option_argument)
-            << A->getOption().getName() << Value;
-      }
-    }
-  }
-
-  switch (getToolChain().getArch()) {
-  default:
-    break;
-  // Add --32/--64 to make sure we get the format we want.
-  // This is incomplete
-  case llvm::Triple::x86:
-    CmdArgs.push_back("--32");
-    break;
-  case llvm::Triple::x86_64:
-    if (getToolChain().getTriple().getEnvironment() == llvm::Triple::GNUX32)
-      CmdArgs.push_back("--x32");
-    else
-      CmdArgs.push_back("--64");
-    break;
-  case llvm::Triple::ppc: {
-    CmdArgs.push_back("-a32");
-    CmdArgs.push_back("-mppc");
-    CmdArgs.push_back(
-      ppc::getPPCAsmModeForCPU(getCPUName(Args, getToolChain().getTriple())));
-    break;
-  }
-  case llvm::Triple::ppc64: {
-    CmdArgs.push_back("-a64");
-    CmdArgs.push_back("-mppc64");
-    CmdArgs.push_back(
-      ppc::getPPCAsmModeForCPU(getCPUName(Args, getToolChain().getTriple())));
-    break;
-  }
-  case llvm::Triple::ppc64le: {
-    CmdArgs.push_back("-a64");
-    CmdArgs.push_back("-mppc64");
-    CmdArgs.push_back("-mlittle-endian");
-    CmdArgs.push_back(
-      ppc::getPPCAsmModeForCPU(getCPUName(Args, getToolChain().getTriple())));
-    break;
-  }
-  case llvm::Triple::riscv32:
-  case llvm::Triple::riscv64: {
-    StringRef ABIName = riscv::getRISCVABI(Args, getToolChain().getTriple());
-    CmdArgs.push_back("-mabi");
-    CmdArgs.push_back(ABIName.data());
-    if (const Arg *A = Args.getLastArg(options::OPT_march_EQ)) {
-      StringRef MArch = A->getValue();
-      CmdArgs.push_back("-march");
-      CmdArgs.push_back(MArch.data());
-    }
-    break;
-  }
-  case llvm::Triple::sparc:
-  case llvm::Triple::sparcel: {
-    CmdArgs.push_back("-32");
-    std::string CPU = getCPUName(Args, getToolChain().getTriple());
-    CmdArgs.push_back(sparc::getSparcAsmModeForCPU(CPU, getToolChain().getTriple()));
-    AddAssemblerKPIC(getToolChain(), Args, CmdArgs);
-    break;
-  }
-  case llvm::Triple::sparcv9: {
-    CmdArgs.push_back("-64");
-    std::string CPU = getCPUName(Args, getToolChain().getTriple());
-    CmdArgs.push_back(sparc::getSparcAsmModeForCPU(CPU, getToolChain().getTriple()));
-    AddAssemblerKPIC(getToolChain(), Args, CmdArgs);
-    break;
-  }
-  case llvm::Triple::arm:
-  case llvm::Triple::armeb:
-  case llvm::Triple::thumb:
-  case llvm::Triple::thumbeb: {
-    const llvm::Triple &Triple2 = getToolChain().getTriple();
-    CmdArgs.push_back(isArmBigEndian(Triple2, Args) ? "-EB" : "-EL");
-    switch (Triple2.getSubArch()) {
-    case llvm::Triple::ARMSubArch_v7:
-      CmdArgs.push_back("-mfpu=neon");
-      break;
-    case llvm::Triple::ARMSubArch_v8:
-      CmdArgs.push_back("-mfpu=crypto-neon-fp-armv8");
-      break;
-    default:
-      break;
-    }
-
-    switch (arm::getARMFloatABI(getToolChain(), Args)) {
-    case arm::FloatABI::Invalid: llvm_unreachable("must have an ABI!");
-    case arm::FloatABI::Soft:
-      CmdArgs.push_back(Args.MakeArgString("-mfloat-abi=soft"));
-      break;
-    case arm::FloatABI::SoftFP:
-      CmdArgs.push_back(Args.MakeArgString("-mfloat-abi=softfp"));
-      break;
-    case arm::FloatABI::Hard:
-      CmdArgs.push_back(Args.MakeArgString("-mfloat-abi=hard"));
-      break;
-    }
-
-    Args.AddLastArg(CmdArgs, options::OPT_march_EQ);
-    normalizeCPUNamesForAssembler(Args, CmdArgs);
-
-    Args.AddLastArg(CmdArgs, options::OPT_mfpu_EQ);
-    break;
-  }
-  case llvm::Triple::aarch64:
-  case llvm::Triple::aarch64_be: {
-    CmdArgs.push_back(
-        getToolChain().getArch() == llvm::Triple::aarch64_be ? "-EB" : "-EL");
-    Args.AddLastArg(CmdArgs, options::OPT_march_EQ);
-    normalizeCPUNamesForAssembler(Args, CmdArgs);
-
-    break;
-  }
-  case llvm::Triple::mips:
-  case llvm::Triple::mipsel:
-  case llvm::Triple::mips64:
-  case llvm::Triple::mips64el: {
-    StringRef CPUName;
-    StringRef ABIName;
-    mips::getMipsCPUAndABI(Args, getToolChain().getTriple(), CPUName, ABIName);
-    ABIName = mips::getGnuCompatibleMipsABIName(ABIName);
-
-    CmdArgs.push_back("-march");
-    CmdArgs.push_back(CPUName.data());
-
-    CmdArgs.push_back("-mabi");
-    CmdArgs.push_back(ABIName.data());
-
-    // -mno-shared should be emitted unless -fpic, -fpie, -fPIC, -fPIE,
-    // or -mshared (not implemented) is in effect.
-    if (RelocationModel == llvm::Reloc::Static)
-      CmdArgs.push_back("-mno-shared");
-
-    // LLVM doesn't support -mplt yet and acts as if it is always given.
-    // However, -mplt has no effect with the N64 ABI.
-    if (ABIName != "64" && !Args.hasArg(options::OPT_mno_abicalls))
-      CmdArgs.push_back("-call_nonpic");
-
-    if (getToolChain().getTriple().isLittleEndian())
-      CmdArgs.push_back("-EL");
-    else
-      CmdArgs.push_back("-EB");
-
-    if (Arg *A = Args.getLastArg(options::OPT_mnan_EQ)) {
-      if (StringRef(A->getValue()) == "2008")
-        CmdArgs.push_back(Args.MakeArgString("-mnan=2008"));
-    }
-
-    // Add the last -mfp32/-mfpxx/-mfp64 or -mfpxx if it is enabled by default.
-    if (Arg *A = Args.getLastArg(options::OPT_mfp32, options::OPT_mfpxx,
-                                 options::OPT_mfp64)) {
-      A->claim();
-      A->render(Args, CmdArgs);
-    } else if (mips::shouldUseFPXX(
-                   Args, getToolChain().getTriple(), CPUName, ABIName,
-                   mips::getMipsFloatABI(getToolChain().getDriver(), Args)))
-      CmdArgs.push_back("-mfpxx");
-
-    // Pass on -mmips16 or -mno-mips16. However, the assembler equivalent of
-    // -mno-mips16 is actually -no-mips16.
-    if (Arg *A =
-            Args.getLastArg(options::OPT_mips16, options::OPT_mno_mips16)) {
-      if (A->getOption().matches(options::OPT_mips16)) {
-        A->claim();
-        A->render(Args, CmdArgs);
-      } else {
-        A->claim();
-        CmdArgs.push_back("-no-mips16");
-      }
-    }
-
-    Args.AddLastArg(CmdArgs, options::OPT_mmicromips,
-                    options::OPT_mno_micromips);
-    Args.AddLastArg(CmdArgs, options::OPT_mdsp, options::OPT_mno_dsp);
-    Args.AddLastArg(CmdArgs, options::OPT_mdspr2, options::OPT_mno_dspr2);
-
-    if (Arg *A = Args.getLastArg(options::OPT_mmsa, options::OPT_mno_msa)) {
-      // Do not use AddLastArg because not all versions of MIPS assembler
-      // support -mmsa / -mno-msa options.
-      if (A->getOption().matches(options::OPT_mmsa))
-        CmdArgs.push_back(Args.MakeArgString("-mmsa"));
-    }
-
-    Args.AddLastArg(CmdArgs, options::OPT_mhard_float,
-                    options::OPT_msoft_float);
-
-    Args.AddLastArg(CmdArgs, options::OPT_mdouble_float,
-                    options::OPT_msingle_float);
-
-    Args.AddLastArg(CmdArgs, options::OPT_modd_spreg,
-                    options::OPT_mno_odd_spreg);
-
-    AddAssemblerKPIC(getToolChain(), Args, CmdArgs);
-    break;
-  }
-  case llvm::Triple::systemz: {
-    // Always pass an -march option, since our default of z10 is later
-    // than the GNU assembler's default.
-    StringRef CPUName = systemz::getSystemZTargetCPU(Args);
-    CmdArgs.push_back(Args.MakeArgString("-march=" + CPUName));
-    break;
-  }
-  }
-
-  Args.AddAllArgs(CmdArgs, options::OPT_I);
-  Args.AddAllArgValues(CmdArgs, options::OPT_Wa_COMMA, options::OPT_Xassembler);
-
-  CmdArgs.push_back("-o");
-  CmdArgs.push_back(Output.getFilename());
-
-  for (const auto &II : Inputs)
-    CmdArgs.push_back(II.getFilename());
-
-  const char *Exec = Args.MakeArgString(getToolChain().GetProgramPath("as"));
-  C.addCommand(llvm::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));
-
-  // Handle the debug info splitting at object creation time if we're
-  // creating an object.
-  // TODO: Currently only works on linux with newer objcopy.
-  if (Args.hasArg(options::OPT_gsplit_dwarf) &&
-      getToolChain().getTriple().isOSLinux())
-    SplitDebugInfo(getToolChain(), C, *this, JA, Args, Output,
-                   SplitDebugName(Args, Output));
-}
-
-namespace {
-// Filter to remove Multilibs that don't exist as a suffix to Path
-class FilterNonExistent {
-  StringRef Base, File;
-  llvm::vfs::FileSystem &VFS;
-
-public:
-  FilterNonExistent(StringRef Base, StringRef File, llvm::vfs::FileSystem &VFS)
-      : Base(Base), File(File), VFS(VFS) {}
-  bool operator()(const Multilib &M) {
-    return !VFS.exists(Base + M.gccSuffix() + File);
-  }
-};
-} // end anonymous namespace
-
-static bool isSoftFloatABI(const ArgList &Args) {
-  Arg *A = Args.getLastArg(options::OPT_msoft_float, options::OPT_mhard_float,
-                           options::OPT_mfloat_abi_EQ);
-  if (!A)
-    return false;
-
-  return A->getOption().matches(options::OPT_msoft_float) ||
-         (A->getOption().matches(options::OPT_mfloat_abi_EQ) &&
-          A->getValue() == StringRef("soft"));
-}
-
-/// \p Flag must be a flag accepted by the driver with its leading '-' removed,
-//     otherwise '-print-multi-lib' will not emit them correctly.
-static void addMultilibFlag(bool Enabled, const char *const Flag,
-                            std::vector<std::string> &Flags) {
-  if (Enabled)
-    Flags.push_back(std::string("+") + Flag);
-  else
-    Flags.push_back(std::string("-") + Flag);
-}
-
-static bool isArmOrThumbArch(llvm::Triple::ArchType Arch) {
-  return Arch == llvm::Triple::arm || Arch == llvm::Triple::thumb;
-}
-
-static bool isMipsEL(llvm::Triple::ArchType Arch) {
-  return Arch == llvm::Triple::mipsel || Arch == llvm::Triple::mips64el;
-}
-
-static bool isMips16(const ArgList &Args) {
-  Arg *A = Args.getLastArg(options::OPT_mips16, options::OPT_mno_mips16);
-  return A && A->getOption().matches(options::OPT_mips16);
-}
-
-static bool isMicroMips(const ArgList &Args) {
-  Arg *A = Args.getLastArg(options::OPT_mmicromips, options::OPT_mno_micromips);
-  return A && A->getOption().matches(options::OPT_mmicromips);
-}
-
-static bool isRISCV(llvm::Triple::ArchType Arch) {
-  return Arch == llvm::Triple::riscv32 || Arch == llvm::Triple::riscv64;
-}
-
-static bool isMSP430(llvm::Triple::ArchType Arch) {
-  return Arch == llvm::Triple::msp430;
-}
-
-static Multilib makeMultilib(StringRef commonSuffix) {
-  return Multilib(commonSuffix, commonSuffix, commonSuffix);
-}
-
-static bool findMipsCsMultilibs(const Multilib::flags_list &Flags,
-                                FilterNonExistent &NonExistent,
-                                DetectedMultilibs &Result) {
-  // Check for Code Sourcery toolchain multilibs
-  MultilibSet CSMipsMultilibs;
-  {
-    auto MArchMips16 = makeMultilib("/mips16").flag("+m32").flag("+mips16");
-
-    auto MArchMicroMips =
-        makeMultilib("/micromips").flag("+m32").flag("+mmicromips");
-
-    auto MArchDefault = makeMultilib("").flag("-mips16").flag("-mmicromips");
-
-    auto UCLibc = makeMultilib("/uclibc").flag("+muclibc");
-
-    auto SoftFloat = makeMultilib("/soft-float").flag("+msoft-float");
-
-    auto Nan2008 = makeMultilib("/nan2008").flag("+mnan=2008");
-
-    auto DefaultFloat =
-        makeMultilib("").flag("-msoft-float").flag("-mnan=2008");
-
-    auto BigEndian = makeMultilib("").flag("+EB").flag("-EL");
-
-    auto LittleEndian = makeMultilib("/el").flag("+EL").flag("-EB");
-
-    // Note that this one's osSuffix is ""
-    auto MAbi64 = makeMultilib("")
-                      .gccSuffix("/64")
-                      .includeSuffix("/64")
-                      .flag("+mabi=n64")
-                      .flag("-mabi=n32")
-                      .flag("-m32");
-
-    CSMipsMultilibs =
-        MultilibSet()
-            .Either(MArchMips16, MArchMicroMips, MArchDefault)
-            .Maybe(UCLibc)
-            .Either(SoftFloat, Nan2008, DefaultFloat)
-            .FilterOut("/micromips/nan2008")
-            .FilterOut("/mips16/nan2008")
-            .Either(BigEndian, LittleEndian)
-            .Maybe(MAbi64)
-            .FilterOut("/mips16.*/64")
-            .FilterOut("/micromips.*/64")
-            .FilterOut(NonExistent)
-            .setIncludeDirsCallback([](const Multilib &M) {
-              std::vector<std::string> Dirs({"/include"});
-              if (StringRef(M.includeSuffix()).startswith("/uclibc"))
-                Dirs.push_back(
-                    "/../../../../mips-linux-gnu/libc/uclibc/usr/include");
-              else
-                Dirs.push_back("/../../../../mips-linux-gnu/libc/usr/include");
-              return Dirs;
-            });
-  }
-
-  MultilibSet DebianMipsMultilibs;
-  {
-    Multilib MAbiN32 =
-        Multilib().gccSuffix("/n32").includeSuffix("/n32").flag("+mabi=n32");
-
-    Multilib M64 = Multilib()
-                       .gccSuffix("/64")
-                       .includeSuffix("/64")
-                       .flag("+m64")
-                       .flag("-m32")
-                       .flag("-mabi=n32");
-
-    Multilib M32 = Multilib().flag("-m64").flag("+m32").flag("-mabi=n32");
-
-    DebianMipsMultilibs =
-        MultilibSet().Either(M32, M64, MAbiN32).FilterOut(NonExistent);
-  }
-
-  // Sort candidates. Toolchain that best meets the directories tree goes first.
-  // Then select the first toolchains matches command line flags.
-  MultilibSet *Candidates[] = {&CSMipsMultilibs, &DebianMipsMultilibs};
-  if (CSMipsMultilibs.size() < DebianMipsMultilibs.size())
-    std::iter_swap(Candidates, Candidates + 1);
-  for (const MultilibSet *Candidate : Candidates) {
-    if (Candidate->select(Flags, Result.SelectedMultilib)) {
-      if (Candidate == &DebianMipsMultilibs)
-        Result.BiarchSibling = Multilib();
-      Result.Multilibs = *Candidate;
-      return true;
-    }
-  }
-  return false;
-}
-
-static bool findMipsAndroidMultilibs(llvm::vfs::FileSystem &VFS, StringRef Path,
-                                     const Multilib::flags_list &Flags,
-                                     FilterNonExistent &NonExistent,
-                                     DetectedMultilibs &Result) {
-
-  MultilibSet AndroidMipsMultilibs =
-      MultilibSet()
-          .Maybe(Multilib("/mips-r2").flag("+march=mips32r2"))
-          .Maybe(Multilib("/mips-r6").flag("+march=mips32r6"))
-          .FilterOut(NonExistent);
-
-  MultilibSet AndroidMipselMultilibs =
-      MultilibSet()
-          .Either(Multilib().flag("+march=mips32"),
-                  Multilib("/mips-r2", "", "/mips-r2").flag("+march=mips32r2"),
-                  Multilib("/mips-r6", "", "/mips-r6").flag("+march=mips32r6"))
-          .FilterOut(NonExistent);
-
-  MultilibSet AndroidMips64elMultilibs =
-      MultilibSet()
-          .Either(
-              Multilib().flag("+march=mips64r6"),
-              Multilib("/32/mips-r1", "", "/mips-r1").flag("+march=mips32"),
-              Multilib("/32/mips-r2", "", "/mips-r2").flag("+march=mips32r2"),
-              Multilib("/32/mips-r6", "", "/mips-r6").flag("+march=mips32r6"))
-          .FilterOut(NonExistent);
-
-  MultilibSet *MS = &AndroidMipsMultilibs;
-  if (VFS.exists(Path + "/mips-r6"))
-    MS = &AndroidMipselMultilibs;
-  else if (VFS.exists(Path + "/32"))
-    MS = &AndroidMips64elMultilibs;
-  if (MS->select(Flags, Result.SelectedMultilib)) {
-    Result.Multilibs = *MS;
-    return true;
-  }
-  return false;
-}
-
-static bool findMipsMuslMultilibs(const Multilib::flags_list &Flags,
-                                  FilterNonExistent &NonExistent,
-                                  DetectedMultilibs &Result) {
-  // Musl toolchain multilibs
-  MultilibSet MuslMipsMultilibs;
-  {
-    auto MArchMipsR2 = makeMultilib("")
-                           .osSuffix("/mips-r2-hard-musl")
-                           .flag("+EB")
-                           .flag("-EL")
-                           .flag("+march=mips32r2");
-
-    auto MArchMipselR2 = makeMultilib("/mipsel-r2-hard-musl")
-                             .flag("-EB")
-                             .flag("+EL")
-                             .flag("+march=mips32r2");
-
-    MuslMipsMultilibs = MultilibSet().Either(MArchMipsR2, MArchMipselR2);
-
-    // Specify the callback that computes the include directories.
-    MuslMipsMultilibs.setIncludeDirsCallback([](const Multilib &M) {
-      return std::vector<std::string>(
-          {"/../sysroot" + M.osSuffix() + "/usr/include"});
-    });
-  }
-  if (MuslMipsMultilibs.select(Flags, Result.SelectedMultilib)) {
-    Result.Multilibs = MuslMipsMultilibs;
-    return true;
-  }
-  return false;
-}
-
-static bool findMipsMtiMultilibs(const Multilib::flags_list &Flags,
-                                 FilterNonExistent &NonExistent,
-                                 DetectedMultilibs &Result) {
-  // CodeScape MTI toolchain v1.2 and early.
-  MultilibSet MtiMipsMultilibsV1;
-  {
-    auto MArchMips32 = makeMultilib("/mips32")
-                           .flag("+m32")
-                           .flag("-m64")
-                           .flag("-mmicromips")
-                           .flag("+march=mips32");
-
-    auto MArchMicroMips = makeMultilib("/micromips")
-                              .flag("+m32")
-                              .flag("-m64")
-                              .flag("+mmicromips");
-
-    auto MArchMips64r2 = makeMultilib("/mips64r2")
-                             .flag("-m32")
-                             .flag("+m64")
-                             .flag("+march=mips64r2");
-
-    auto MArchMips64 = makeMultilib("/mips64").flag("-m32").flag("+m64").flag(
-        "-march=mips64r2");
-
-    auto MArchDefault = makeMultilib("")
-                            .flag("+m32")
-                            .flag("-m64")
-                            .flag("-mmicromips")
-                            .flag("+march=mips32r2");
-
-    auto Mips16 = makeMultilib("/mips16").flag("+mips16");
-
-    auto UCLibc = makeMultilib("/uclibc").flag("+muclibc");
-
-    auto MAbi64 =
-        makeMultilib("/64").flag("+mabi=n64").flag("-mabi=n32").flag("-m32");
-
-    auto BigEndian = makeMultilib("").flag("+EB").flag("-EL");
-
-    auto LittleEndian = makeMultilib("/el").flag("+EL").flag("-EB");
-
-    auto SoftFloat = makeMultilib("/sof").flag("+msoft-float");
-
-    auto Nan2008 = makeMultilib("/nan2008").flag("+mnan=2008");
-
-    MtiMipsMultilibsV1 =
-        MultilibSet()
-            .Either(MArchMips32, MArchMicroMips, MArchMips64r2, MArchMips64,
-                    MArchDefault)
-            .Maybe(UCLibc)
-            .Maybe(Mips16)
-            .FilterOut("/mips64/mips16")
-            .FilterOut("/mips64r2/mips16")
-            .FilterOut("/micromips/mips16")
-            .Maybe(MAbi64)
-            .FilterOut("/micromips/64")
-            .FilterOut("/mips32/64")
-            .FilterOut("^/64")
-            .FilterOut("/mips16/64")
-            .Either(BigEndian, LittleEndian)
-            .Maybe(SoftFloat)
-            .Maybe(Nan2008)
-            .FilterOut(".*sof/nan2008")
-            .FilterOut(NonExistent)
-            .setIncludeDirsCallback([](const Multilib &M) {
-              std::vector<std::string> Dirs({"/include"});
-              if (StringRef(M.includeSuffix()).startswith("/uclibc"))
-                Dirs.push_back("/../../../../sysroot/uclibc/usr/include");
-              else
-                Dirs.push_back("/../../../../sysroot/usr/include");
-              return Dirs;
-            });
-  }
-
-  // CodeScape IMG toolchain starting from v1.3.
-  MultilibSet MtiMipsMultilibsV2;
-  {
-    auto BeHard = makeMultilib("/mips-r2-hard")
-                      .flag("+EB")
-                      .flag("-msoft-float")
-                      .flag("-mnan=2008")
-                      .flag("-muclibc");
-    auto BeSoft = makeMultilib("/mips-r2-soft")
-                      .flag("+EB")
-                      .flag("+msoft-float")
-                      .flag("-mnan=2008");
-    auto ElHard = makeMultilib("/mipsel-r2-hard")
-                      .flag("+EL")
-                      .flag("-msoft-float")
-                      .flag("-mnan=2008")
-                      .flag("-muclibc");
-    auto ElSoft = makeMultilib("/mipsel-r2-soft")
-                      .flag("+EL")
-                      .flag("+msoft-float")
-                      .flag("-mnan=2008")
-                      .flag("-mmicromips");
-    auto BeHardNan = makeMultilib("/mips-r2-hard-nan2008")
-                         .flag("+EB")
-                         .flag("-msoft-float")
-                         .flag("+mnan=2008")
-                         .flag("-muclibc");
-    auto ElHardNan = makeMultilib("/mipsel-r2-hard-nan2008")
-                         .flag("+EL")
-                         .flag("-msoft-float")
-                         .flag("+mnan=2008")
-                         .flag("-muclibc")
-                         .flag("-mmicromips");
-    auto BeHardNanUclibc = makeMultilib("/mips-r2-hard-nan2008-uclibc")
-                               .flag("+EB")
-                               .flag("-msoft-float")
-                               .flag("+mnan=2008")
-                               .flag("+muclibc");
-    auto ElHardNanUclibc = makeMultilib("/mipsel-r2-hard-nan2008-uclibc")
-                               .flag("+EL")
-                               .flag("-msoft-float")
-                               .flag("+mnan=2008")
-                               .flag("+muclibc");
-    auto BeHardUclibc = makeMultilib("/mips-r2-hard-uclibc")
-                            .flag("+EB")
-                            .flag("-msoft-float")
-                            .flag("-mnan=2008")
-                            .flag("+muclibc");
-    auto ElHardUclibc = makeMultilib("/mipsel-r2-hard-uclibc")
-                            .flag("+EL")
-                            .flag("-msoft-float")
-                            .flag("-mnan=2008")
-                            .flag("+muclibc");
-    auto ElMicroHardNan = makeMultilib("/micromipsel-r2-hard-nan2008")
-                              .flag("+EL")
-                              .flag("-msoft-float")
-                              .flag("+mnan=2008")
-                              .flag("+mmicromips");
-    auto ElMicroSoft = makeMultilib("/micromipsel-r2-soft")
-                           .flag("+EL")
-                           .flag("+msoft-float")
-                           .flag("-mnan=2008")
-                           .flag("+mmicromips");
-
-    auto O32 =
-        makeMultilib("/lib").osSuffix("").flag("-mabi=n32").flag("-mabi=n64");
-    auto N32 =
-        makeMultilib("/lib32").osSuffix("").flag("+mabi=n32").flag("-mabi=n64");
-    auto N64 =
-        makeMultilib("/lib64").osSuffix("").flag("-mabi=n32").flag("+mabi=n64");
-
-    MtiMipsMultilibsV2 =
-        MultilibSet()
-            .Either({BeHard, BeSoft, ElHard, ElSoft, BeHardNan, ElHardNan,
-                     BeHardNanUclibc, ElHardNanUclibc, BeHardUclibc,
-                     ElHardUclibc, ElMicroHardNan, ElMicroSoft})
-            .Either(O32, N32, N64)
-            .FilterOut(NonExistent)
-            .setIncludeDirsCallback([](const Multilib &M) {
-              return std::vector<std::string>({"/../../../../sysroot" +
-                                               M.includeSuffix() +
-                                               "/../usr/include"});
-            })
-            .setFilePathsCallback([](const Multilib &M) {
-              return std::vector<std::string>(
-                  {"/../../../../mips-mti-linux-gnu/lib" + M.gccSuffix()});
-            });
-  }
-  for (auto Candidate : {&MtiMipsMultilibsV1, &MtiMipsMultilibsV2}) {
-    if (Candidate->select(Flags, Result.SelectedMultilib)) {
-      Result.Multilibs = *Candidate;
-      return true;
-    }
-  }
-  return false;
-}
-
-static bool findMipsImgMultilibs(const Multilib::flags_list &Flags,
-                                 FilterNonExistent &NonExistent,
-                                 DetectedMultilibs &Result) {
-  // CodeScape IMG toolchain v1.2 and early.
-  MultilibSet ImgMultilibsV1;
-  {
-    auto Mips64r6 = makeMultilib("/mips64r6").flag("+m64").flag("-m32");
-
-    auto LittleEndian = makeMultilib("/el").flag("+EL").flag("-EB");
-
-    auto MAbi64 =
-        makeMultilib("/64").flag("+mabi=n64").flag("-mabi=n32").flag("-m32");
-
-    ImgMultilibsV1 =
-        MultilibSet()
-            .Maybe(Mips64r6)
-            .Maybe(MAbi64)
-            .Maybe(LittleEndian)
-            .FilterOut(NonExistent)
-            .setIncludeDirsCallback([](const Multilib &M) {
-              return std::vector<std::string>(
-                  {"/include", "/../../../../sysroot/usr/include"});
-            });
-  }
-
-  // CodeScape IMG toolchain starting from v1.3.
-  MultilibSet ImgMultilibsV2;
-  {
-    auto BeHard = makeMultilib("/mips-r6-hard")
-                      .flag("+EB")
-                      .flag("-msoft-float")
-                      .flag("-mmicromips");
-    auto BeSoft = makeMultilib("/mips-r6-soft")
-                      .flag("+EB")
-                      .flag("+msoft-float")
-                      .flag("-mmicromips");
-    auto ElHard = makeMultilib("/mipsel-r6-hard")
-                      .flag("+EL")
-                      .flag("-msoft-float")
-                      .flag("-mmicromips");
-    auto ElSoft = makeMultilib("/mipsel-r6-soft")
-                      .flag("+EL")
-                      .flag("+msoft-float")
-                      .flag("-mmicromips");
-    auto BeMicroHard = makeMultilib("/micromips-r6-hard")
-                           .flag("+EB")
-                           .flag("-msoft-float")
-                           .flag("+mmicromips");
-    auto BeMicroSoft = makeMultilib("/micromips-r6-soft")
-                           .flag("+EB")
-                           .flag("+msoft-float")
-                           .flag("+mmicromips");
-    auto ElMicroHard = makeMultilib("/micromipsel-r6-hard")
-                           .flag("+EL")
-                           .flag("-msoft-float")
-                           .flag("+mmicromips");
-    auto ElMicroSoft = makeMultilib("/micromipsel-r6-soft")
-                           .flag("+EL")
-                           .flag("+msoft-float")
-                           .flag("+mmicromips");
-
-    auto O32 =
-        makeMultilib("/lib").osSuffix("").flag("-mabi=n32").flag("-mabi=n64");
-    auto N32 =
-        makeMultilib("/lib32").osSuffix("").flag("+mabi=n32").flag("-mabi=n64");
-    auto N64 =
-        makeMultilib("/lib64").osSuffix("").flag("-mabi=n32").flag("+mabi=n64");
-
-    ImgMultilibsV2 =
-        MultilibSet()
-            .Either({BeHard, BeSoft, ElHard, ElSoft, BeMicroHard, BeMicroSoft,
-                     ElMicroHard, ElMicroSoft})
-            .Either(O32, N32, N64)
-            .FilterOut(NonExistent)
-            .setIncludeDirsCallback([](const Multilib &M) {
-              return std::vector<std::string>({"/../../../../sysroot" +
-                                               M.includeSuffix() +
-                                               "/../usr/include"});
-            })
-            .setFilePathsCallback([](const Multilib &M) {
-              return std::vector<std::string>(
-                  {"/../../../../mips-img-linux-gnu/lib" + M.gccSuffix()});
-            });
-  }
-  for (auto Candidate : {&ImgMultilibsV1, &ImgMultilibsV2}) {
-    if (Candidate->select(Flags, Result.SelectedMultilib)) {
-      Result.Multilibs = *Candidate;
-      return true;
-    }
-  }
-  return false;
-}
-
-bool clang::driver::findMIPSMultilibs(const Driver &D,
-                                      const llvm::Triple &TargetTriple,
-                                      StringRef Path, const ArgList &Args,
-                                      DetectedMultilibs &Result) {
-  FilterNonExistent NonExistent(Path, "/crtbegin.o", D.getVFS());
-
-  StringRef CPUName;
-  StringRef ABIName;
-  tools::mips::getMipsCPUAndABI(Args, TargetTriple, CPUName, ABIName);
-
-  llvm::Triple::ArchType TargetArch = TargetTriple.getArch();
-
-  Multilib::flags_list Flags;
-  addMultilibFlag(TargetTriple.isMIPS32(), "m32", Flags);
-  addMultilibFlag(TargetTriple.isMIPS64(), "m64", Flags);
-  addMultilibFlag(isMips16(Args), "mips16", Flags);
-  addMultilibFlag(CPUName == "mips32", "march=mips32", Flags);
-  addMultilibFlag(CPUName == "mips32r2" || CPUName == "mips32r3" ||
-                      CPUName == "mips32r5" || CPUName == "p5600",
-                  "march=mips32r2", Flags);
-  addMultilibFlag(CPUName == "mips32r6", "march=mips32r6", Flags);
-  addMultilibFlag(CPUName == "mips64", "march=mips64", Flags);
-  addMultilibFlag(CPUName == "mips64r2" || CPUName == "mips64r3" ||
-                      CPUName == "mips64r5" || CPUName == "octeon",
-                  "march=mips64r2", Flags);
-  addMultilibFlag(CPUName == "mips64r6", "march=mips64r6", Flags);
-  addMultilibFlag(isMicroMips(Args), "mmicromips", Flags);
-  addMultilibFlag(tools::mips::isUCLibc(Args), "muclibc", Flags);
-  addMultilibFlag(tools::mips::isNaN2008(Args, TargetTriple), "mnan=2008",
-                  Flags);
-  addMultilibFlag(ABIName == "n32", "mabi=n32", Flags);
-  addMultilibFlag(ABIName == "n64", "mabi=n64", Flags);
-  addMultilibFlag(isSoftFloatABI(Args), "msoft-float", Flags);
-  addMultilibFlag(!isSoftFloatABI(Args), "mhard-float", Flags);
-  addMultilibFlag(isMipsEL(TargetArch), "EL", Flags);
-  addMultilibFlag(!isMipsEL(TargetArch), "EB", Flags);
-
-  if (TargetTriple.isAndroid())
-    return findMipsAndroidMultilibs(D.getVFS(), Path, Flags, NonExistent,
-                                    Result);
-
-  if (TargetTriple.getVendor() == llvm::Triple::MipsTechnologies &&
-      TargetTriple.getOS() == llvm::Triple::Linux &&
-      TargetTriple.getEnvironment() == llvm::Triple::UnknownEnvironment)
-    return findMipsMuslMultilibs(Flags, NonExistent, Result);
-
-  if (TargetTriple.getVendor() == llvm::Triple::MipsTechnologies &&
-      TargetTriple.getOS() == llvm::Triple::Linux &&
-      TargetTriple.isGNUEnvironment())
-    return findMipsMtiMultilibs(Flags, NonExistent, Result);
-
-  if (TargetTriple.getVendor() == llvm::Triple::ImaginationTechnologies &&
-      TargetTriple.getOS() == llvm::Triple::Linux &&
-      TargetTriple.isGNUEnvironment())
-    return findMipsImgMultilibs(Flags, NonExistent, Result);
-
-  if (findMipsCsMultilibs(Flags, NonExistent, Result))
-    return true;
-
-  // Fallback to the regular toolchain-tree structure.
-  Multilib Default;
-  Result.Multilibs.push_back(Default);
-  Result.Multilibs.FilterOut(NonExistent);
-
-  if (Result.Multilibs.select(Flags, Result.SelectedMultilib)) {
-    Result.BiarchSibling = Multilib();
-    return true;
-  }
-
-  return false;
-}
-
-static void findAndroidArmMultilibs(const Driver &D,
-                                    const llvm::Triple &TargetTriple,
-                                    StringRef Path, const ArgList &Args,
-                                    DetectedMultilibs &Result) {
-  // Find multilibs with subdirectories like armv7-a, thumb, armv7-a/thumb.
-  FilterNonExistent NonExistent(Path, "/crtbegin.o", D.getVFS());
-  Multilib ArmV7Multilib = makeMultilib("/armv7-a")
-                               .flag("+march=armv7-a")
-                               .flag("-mthumb");
-  Multilib ThumbMultilib = makeMultilib("/thumb")
-                               .flag("-march=armv7-a")
-                               .flag("+mthumb");
-  Multilib ArmV7ThumbMultilib = makeMultilib("/armv7-a/thumb")
-                               .flag("+march=armv7-a")
-                               .flag("+mthumb");
-  Multilib DefaultMultilib = makeMultilib("")
-                               .flag("-march=armv7-a")
-                               .flag("-mthumb");
-  MultilibSet AndroidArmMultilibs =
-      MultilibSet()
-          .Either(ThumbMultilib, ArmV7Multilib,
-                  ArmV7ThumbMultilib, DefaultMultilib)
-          .FilterOut(NonExistent);
-
-  Multilib::flags_list Flags;
-  llvm::StringRef Arch = Args.getLastArgValue(options::OPT_march_EQ);
-  bool IsArmArch = TargetTriple.getArch() == llvm::Triple::arm;
-  bool IsThumbArch = TargetTriple.getArch() == llvm::Triple::thumb;
-  bool IsV7SubArch = TargetTriple.getSubArch() == llvm::Triple::ARMSubArch_v7;
-  bool IsThumbMode = IsThumbArch ||
-      Args.hasFlag(options::OPT_mthumb, options::OPT_mno_thumb, false) ||
-      (IsArmArch && llvm::ARM::parseArchISA(Arch) == llvm::ARM::ISAKind::THUMB);
-  bool IsArmV7Mode = (IsArmArch || IsThumbArch) &&
-      (llvm::ARM::parseArchVersion(Arch) == 7 ||
-       (IsArmArch && Arch == "" && IsV7SubArch));
-  addMultilibFlag(IsArmV7Mode, "march=armv7-a", Flags);
-  addMultilibFlag(IsThumbMode, "mthumb", Flags);
-
-  if (AndroidArmMultilibs.select(Flags, Result.SelectedMultilib))
-    Result.Multilibs = AndroidArmMultilibs;
-}
-
-static bool findMSP430Multilibs(const Driver &D,
-                                const llvm::Triple &TargetTriple,
-                                StringRef Path, const ArgList &Args,
-                                DetectedMultilibs &Result) {
-  FilterNonExistent NonExistent(Path, "/crtbegin.o", D.getVFS());
-  Multilib MSP430Multilib = makeMultilib("/430");
-  // FIXME: when clang starts to support msp430x ISA additional logic
-  // to select between multilib must be implemented
-  // Multilib MSP430xMultilib = makeMultilib("/large");
-
-  Result.Multilibs.push_back(MSP430Multilib);
-  Result.Multilibs.FilterOut(NonExistent);
-
-  Multilib::flags_list Flags;
-  if (Result.Multilibs.select(Flags, Result.SelectedMultilib))
-    return true;
-
-  return false;
-}
-
-static void findRISCVMultilibs(const Driver &D,
-                               const llvm::Triple &TargetTriple, StringRef Path,
-                               const ArgList &Args, DetectedMultilibs &Result) {
-
-  FilterNonExistent NonExistent(Path, "/crtbegin.o", D.getVFS());
-  Multilib Ilp32 = makeMultilib("lib32/ilp32").flag("+m32").flag("+mabi=ilp32");
-  Multilib Ilp32f =
-      makeMultilib("lib32/ilp32f").flag("+m32").flag("+mabi=ilp32f");
-  Multilib Ilp32d =
-      makeMultilib("lib32/ilp32d").flag("+m32").flag("+mabi=ilp32d");
-  Multilib Lp64 = makeMultilib("lib64/lp64").flag("+m64").flag("+mabi=lp64");
-  Multilib Lp64f = makeMultilib("lib64/lp64f").flag("+m64").flag("+mabi=lp64f");
-  Multilib Lp64d = makeMultilib("lib64/lp64d").flag("+m64").flag("+mabi=lp64d");
-  MultilibSet RISCVMultilibs =
-      MultilibSet()
-          .Either({Ilp32, Ilp32f, Ilp32d, Lp64, Lp64f, Lp64d})
-          .FilterOut(NonExistent);
-
-  Multilib::flags_list Flags;
-  bool IsRV64 = TargetTriple.getArch() == llvm::Triple::riscv64;
-  StringRef ABIName = tools::riscv::getRISCVABI(Args, TargetTriple);
-
-  addMultilibFlag(!IsRV64, "m32", Flags);
-  addMultilibFlag(IsRV64, "m64", Flags);
-  addMultilibFlag(ABIName == "ilp32", "mabi=ilp32", Flags);
-  addMultilibFlag(ABIName == "ilp32f", "mabi=ilp32f", Flags);
-  addMultilibFlag(ABIName == "ilp32d", "mabi=ilp32d", Flags);
-  addMultilibFlag(ABIName == "lp64", "mabi=lp64", Flags);
-  addMultilibFlag(ABIName == "lp64f", "mabi=lp64f", Flags);
-  addMultilibFlag(ABIName == "lp64d", "mabi=lp64d", Flags);
-
-  if (RISCVMultilibs.select(Flags, Result.SelectedMultilib))
-    Result.Multilibs = RISCVMultilibs;
-}
-
-static bool findBiarchMultilibs(const Driver &D,
-                                const llvm::Triple &TargetTriple,
-                                StringRef Path, const ArgList &Args,
-                                bool NeedsBiarchSuffix,
-                                DetectedMultilibs &Result) {
-  Multilib Default;
-
-  // Some versions of SUSE and Fedora on ppc64 put 32-bit libs
-  // in what would normally be GCCInstallPath and put the 64-bit
-  // libs in a subdirectory named 64. The simple logic we follow is that
-  // *if* there is a subdirectory of the right name with crtbegin.o in it,
-  // we use that. If not, and if not a biarch triple alias, we look for
-  // crtbegin.o without the subdirectory.
-
-  StringRef Suff64 = "/64";
-  // Solaris uses platform-specific suffixes instead of /64.
-  if (TargetTriple.getOS() == llvm::Triple::Solaris) {
-    switch (TargetTriple.getArch()) {
-    case llvm::Triple::x86:
-    case llvm::Triple::x86_64:
-      Suff64 = "/amd64";
-      break;
-    case llvm::Triple::sparc:
-    case llvm::Triple::sparcv9:
-      Suff64 = "/sparcv9";
-      break;
-    default:
-      break;
-    }
-  }
-
-  Multilib Alt64 = Multilib()
-                       .gccSuffix(Suff64)
-                       .includeSuffix(Suff64)
-                       .flag("-m32")
-                       .flag("+m64")
-                       .flag("-mx32");
-  Multilib Alt32 = Multilib()
-                       .gccSuffix("/32")
-                       .includeSuffix("/32")
-                       .flag("+m32")
-                       .flag("-m64")
-                       .flag("-mx32");
-  Multilib Altx32 = Multilib()
-                        .gccSuffix("/x32")
-                        .includeSuffix("/x32")
-                        .flag("-m32")
-                        .flag("-m64")
-                        .flag("+mx32");
-
-  // GCC toolchain for IAMCU doesn't have crtbegin.o, so look for libgcc.a.
-  FilterNonExistent NonExistent(
-      Path, TargetTriple.isOSIAMCU() ? "/libgcc.a" : "/crtbegin.o", D.getVFS());
-
-  // Determine default multilib from: 32, 64, x32
-  // Also handle cases such as 64 on 32, 32 on 64, etc.
-  enum { UNKNOWN, WANT32, WANT64, WANTX32 } Want = UNKNOWN;
-  const bool IsX32 = TargetTriple.getEnvironment() == llvm::Triple::GNUX32;
-  if (TargetTriple.isArch32Bit() && !NonExistent(Alt32))
-    Want = WANT64;
-  else if (TargetTriple.isArch64Bit() && IsX32 && !NonExistent(Altx32))
-    Want = WANT64;
-  else if (TargetTriple.isArch64Bit() && !IsX32 && !NonExistent(Alt64))
-    Want = WANT32;
-  else {
-    if (TargetTriple.isArch32Bit())
-      Want = NeedsBiarchSuffix ? WANT64 : WANT32;
-    else if (IsX32)
-      Want = NeedsBiarchSuffix ? WANT64 : WANTX32;
-    else
-      Want = NeedsBiarchSuffix ? WANT32 : WANT64;
-  }
-
-  if (Want == WANT32)
-    Default.flag("+m32").flag("-m64").flag("-mx32");
-  else if (Want == WANT64)
-    Default.flag("-m32").flag("+m64").flag("-mx32");
-  else if (Want == WANTX32)
-    Default.flag("-m32").flag("-m64").flag("+mx32");
-  else
-    return false;
-
-  Result.Multilibs.push_back(Default);
-  Result.Multilibs.push_back(Alt64);
-  Result.Multilibs.push_back(Alt32);
-  Result.Multilibs.push_back(Altx32);
-
-  Result.Multilibs.FilterOut(NonExistent);
-
-  Multilib::flags_list Flags;
-  addMultilibFlag(TargetTriple.isArch64Bit() && !IsX32, "m64", Flags);
-  addMultilibFlag(TargetTriple.isArch32Bit(), "m32", Flags);
-  addMultilibFlag(TargetTriple.isArch64Bit() && IsX32, "mx32", Flags);
-
-  if (!Result.Multilibs.select(Flags, Result.SelectedMultilib))
-    return false;
-
-  if (Result.SelectedMultilib == Alt64 || Result.SelectedMultilib == Alt32 ||
-      Result.SelectedMultilib == Altx32)
-    Result.BiarchSibling = Default;
-
-  return true;
-}
-
-/// Generic_GCC - A tool chain using the 'gcc' command to perform
-/// all subcommands; this relies on gcc translating the majority of
-/// command line options.
-
-/// Less-than for GCCVersion, implementing a Strict Weak Ordering.
-bool Generic_GCC::GCCVersion::isOlderThan(int RHSMajor, int RHSMinor,
-                                          int RHSPatch,
-                                          StringRef RHSPatchSuffix) const {
-  if (Major != RHSMajor)
-    return Major < RHSMajor;
-  if (Minor != RHSMinor)
-    return Minor < RHSMinor;
-  if (Patch != RHSPatch) {
-    // Note that versions without a specified patch sort higher than those with
-    // a patch.
-    if (RHSPatch == -1)
-      return true;
-    if (Patch == -1)
-      return false;
-
-    // Otherwise just sort on the patch itself.
-    return Patch < RHSPatch;
-  }
-  if (PatchSuffix != RHSPatchSuffix) {
-    // Sort empty suffixes higher.
-    if (RHSPatchSuffix.empty())
-      return true;
-    if (PatchSuffix.empty())
-      return false;
-
-    // Provide a lexicographic sort to make this a total ordering.
-    return PatchSuffix < RHSPatchSuffix;
-  }
-
-  // The versions are equal.
-  return false;
-}
-
-/// Parse a GCCVersion object out of a string of text.
-///
-/// This is the primary means of forming GCCVersion objects.
-/*static*/
-Generic_GCC::GCCVersion Generic_GCC::GCCVersion::Parse(StringRef VersionText) {
-  const GCCVersion BadVersion = {VersionText.str(), -1, -1, -1, "", "", ""};
-  std::pair<StringRef, StringRef> First = VersionText.split('.');
-  std::pair<StringRef, StringRef> Second = First.second.split('.');
-
-  GCCVersion GoodVersion = {VersionText.str(), -1, -1, -1, "", "", ""};
-  if (First.first.getAsInteger(10, GoodVersion.Major) || GoodVersion.Major < 0)
-    return BadVersion;
-  GoodVersion.MajorStr = First.first.str();
-  if (First.second.empty())
-    return GoodVersion;
-  StringRef MinorStr = Second.first;
-  if (Second.second.empty()) {
-    if (size_t EndNumber = MinorStr.find_first_not_of("0123456789")) {
-      GoodVersion.PatchSuffix = MinorStr.substr(EndNumber);
-      MinorStr = MinorStr.slice(0, EndNumber);
-    }
-  }
-  if (MinorStr.getAsInteger(10, GoodVersion.Minor) || GoodVersion.Minor < 0)
-    return BadVersion;
-  GoodVersion.MinorStr = MinorStr.str();
-
-  // First look for a number prefix and parse that if present. Otherwise just
-  // stash the entire patch string in the suffix, and leave the number
-  // unspecified. This covers versions strings such as:
-  //   5        (handled above)
-  //   4.4
-  //   4.4-patched
-  //   4.4.0
-  //   4.4.x
-  //   4.4.2-rc4
-  //   4.4.x-patched
-  // And retains any patch number it finds.
-  StringRef PatchText = Second.second;
-  if (!PatchText.empty()) {
-    if (size_t EndNumber = PatchText.find_first_not_of("0123456789")) {
-      // Try to parse the number and any suffix.
-      if (PatchText.slice(0, EndNumber).getAsInteger(10, GoodVersion.Patch) ||
-          GoodVersion.Patch < 0)
-        return BadVersion;
-      GoodVersion.PatchSuffix = PatchText.substr(EndNumber);
-    }
-  }
-
-  return GoodVersion;
-}
-
-static llvm::StringRef getGCCToolchainDir(const ArgList &Args,
-                                          llvm::StringRef SysRoot) {
-  const Arg *A = Args.getLastArg(clang::driver::options::OPT_gcc_toolchain);
-  if (A)
-    return A->getValue();
-
-  // If we have a SysRoot, ignore GCC_INSTALL_PREFIX.
-  // GCC_INSTALL_PREFIX specifies the gcc installation for the default
-  // sysroot and is likely not valid with a different sysroot.
-  if (!SysRoot.empty())
-    return "";
-
-  return GCC_INSTALL_PREFIX;
-}
-
-/// Initialize a GCCInstallationDetector from the driver.
-///
-/// This performs all of the autodetection and sets up the various paths.
-/// Once constructed, a GCCInstallationDetector is essentially immutable.
-///
-/// FIXME: We shouldn't need an explicit TargetTriple parameter here, and
-/// should instead pull the target out of the driver. This is currently
-/// necessary because the driver doesn't store the final version of the target
-/// triple.
-void Generic_GCC::GCCInstallationDetector::init(
-    const llvm::Triple &TargetTriple, const ArgList &Args,
-    ArrayRef<std::string> ExtraTripleAliases) {
-  llvm::Triple BiarchVariantTriple = TargetTriple.isArch32Bit()
-                                         ? TargetTriple.get64BitArchVariant()
-                                         : TargetTriple.get32BitArchVariant();
-  // The library directories which may contain GCC installations.
-  SmallVector<StringRef, 4> CandidateLibDirs, CandidateBiarchLibDirs;
-  // The compatible GCC triples for this particular architecture.
-  SmallVector<StringRef, 16> CandidateTripleAliases;
-  SmallVector<StringRef, 16> CandidateBiarchTripleAliases;
-  CollectLibDirsAndTriples(TargetTriple, BiarchVariantTriple, CandidateLibDirs,
-                           CandidateTripleAliases, CandidateBiarchLibDirs,
-                           CandidateBiarchTripleAliases);
-
-  // Compute the set of prefixes for our search.
-  SmallVector<std::string, 8> Prefixes(D.PrefixDirs.begin(),
-                                       D.PrefixDirs.end());
-
-  StringRef GCCToolchainDir = getGCCToolchainDir(Args, D.SysRoot);
-  if (GCCToolchainDir != "") {
-    if (GCCToolchainDir.back() == '/')
-      GCCToolchainDir = GCCToolchainDir.drop_back(); // remove the /
-
-    Prefixes.push_back(GCCToolchainDir);
-  } else {
-    // If we have a SysRoot, try that first.
-    if (!D.SysRoot.empty()) {
-      Prefixes.push_back(D.SysRoot);
-      AddDefaultGCCPrefixes(TargetTriple, Prefixes, D.SysRoot);
-    }
-
-    // Then look for gcc installed alongside clang.
-    Prefixes.push_back(D.InstalledDir + "/..");
-
-    // Next, look for prefix(es) that correspond to distribution-supplied gcc
-    // installations.
-    if (D.SysRoot.empty()) {
-      // Typically /usr.
-      AddDefaultGCCPrefixes(TargetTriple, Prefixes, D.SysRoot);
-    }
-  }
-
-  // Try to respect gcc-config on Gentoo. However, do that only
-  // if --gcc-toolchain is not provided or equal to the Gentoo install
-  // in /usr. This avoids accidentally enforcing the system GCC version
-  // when using a custom toolchain.
-  if (GCCToolchainDir == "" || GCCToolchainDir == D.SysRoot + "/usr") {
-    SmallVector<StringRef, 16> GentooTestTriples;
-    // Try to match an exact triple as target triple first.
-    // e.g. crossdev -S x86_64-gentoo-linux-gnu will install gcc libs for
-    // x86_64-gentoo-linux-gnu. But "clang -target x86_64-gentoo-linux-gnu"
-    // may pick the libraries for x86_64-pc-linux-gnu even when exact matching
-    // triple x86_64-gentoo-linux-gnu is present.
-    GentooTestTriples.push_back(TargetTriple.str());
-    // Check rest of triples.
-    GentooTestTriples.append(ExtraTripleAliases.begin(),
-                             ExtraTripleAliases.end());
-    GentooTestTriples.append(CandidateTripleAliases.begin(),
-                             CandidateTripleAliases.end());
-    if (ScanGentooConfigs(TargetTriple, Args, GentooTestTriples,
-                          CandidateBiarchTripleAliases))
-      return;
-  }
-
-  // Loop over the various components which exist and select the best GCC
-  // installation available. GCC installs are ranked by version number.
-  Version = GCCVersion::Parse("0.0.0");
-  for (const std::string &Prefix : Prefixes) {
-    if (!D.getVFS().exists(Prefix))
-      continue;
-    for (StringRef Suffix : CandidateLibDirs) {
-      const std::string LibDir = Prefix + Suffix.str();
-      if (!D.getVFS().exists(LibDir))
-        continue;
-      // Try to match the exact target triple first.
-      ScanLibDirForGCCTriple(TargetTriple, Args, LibDir, TargetTriple.str());
-      // Try rest of possible triples.
-      for (StringRef Candidate : ExtraTripleAliases) // Try these first.
-        ScanLibDirForGCCTriple(TargetTriple, Args, LibDir, Candidate);
-      for (StringRef Candidate : CandidateTripleAliases)
-        ScanLibDirForGCCTriple(TargetTriple, Args, LibDir, Candidate);
-    }
-    for (StringRef Suffix : CandidateBiarchLibDirs) {
-      const std::string LibDir = Prefix + Suffix.str();
-      if (!D.getVFS().exists(LibDir))
-        continue;
-      for (StringRef Candidate : CandidateBiarchTripleAliases)
-        ScanLibDirForGCCTriple(TargetTriple, Args, LibDir, Candidate,
-                               /*NeedsBiarchSuffix=*/ true);
-    }
-  }
-}
-
-void Generic_GCC::GCCInstallationDetector::print(raw_ostream &OS) const {
-  for (const auto &InstallPath : CandidateGCCInstallPaths)
-    OS << "Found candidate GCC installation: " << InstallPath << "\n";
-
-  if (!GCCInstallPath.empty())
-    OS << "Selected GCC installation: " << GCCInstallPath << "\n";
-
-  for (const auto &Multilib : Multilibs)
-    OS << "Candidate multilib: " << Multilib << "\n";
-
-  if (Multilibs.size() != 0 || !SelectedMultilib.isDefault())
-    OS << "Selected multilib: " << SelectedMultilib << "\n";
-}
-
-bool Generic_GCC::GCCInstallationDetector::getBiarchSibling(Multilib &M) const {
-  if (BiarchSibling.hasValue()) {
-    M = BiarchSibling.getValue();
-    return true;
-  }
-  return false;
-}
-
-void Generic_GCC::GCCInstallationDetector::AddDefaultGCCPrefixes(
-    const llvm::Triple &TargetTriple, SmallVectorImpl<std::string> &Prefixes,
-    StringRef SysRoot) {
-  if (TargetTriple.getOS() == llvm::Triple::Solaris) {
-    // Solaris is a special case.
-    // The GCC installation is under
-    //   /usr/gcc/<major>.<minor>/lib/gcc/<triple>/<major>.<minor>.<patch>/
-    // so we need to find those /usr/gcc/*/lib/gcc libdirs and go with
-    // /usr/gcc/<version> as a prefix.
-
-    std::string PrefixDir = SysRoot.str() + "/usr/gcc";
-    std::error_code EC;
-    for (llvm::vfs::directory_iterator LI = D.getVFS().dir_begin(PrefixDir, EC),
-                                       LE;
-         !EC && LI != LE; LI = LI.increment(EC)) {
-      StringRef VersionText = llvm::sys::path::filename(LI->path());
-      GCCVersion CandidateVersion = GCCVersion::Parse(VersionText);
-
-      // Filter out obviously bad entries.
-      if (CandidateVersion.Major == -1 || CandidateVersion.isOlderThan(4, 1, 1))
-        continue;
-
-      std::string CandidatePrefix = PrefixDir + "/" + VersionText.str();
-      std::string CandidateLibPath = CandidatePrefix + "/lib/gcc";
-      if (!D.getVFS().exists(CandidateLibPath))
-        continue;
-
-      Prefixes.push_back(CandidatePrefix);
-    }
-    return;
-  }
-
-  // Non-Solaris is much simpler - most systems just go with "/usr".
-  if (SysRoot.empty() && TargetTriple.getOS() == llvm::Triple::Linux) {
-    // Yet, still look for RHEL devtoolsets.
-    Prefixes.push_back("/opt/rh/devtoolset-7/root/usr");
-    Prefixes.push_back("/opt/rh/devtoolset-6/root/usr");
-    Prefixes.push_back("/opt/rh/devtoolset-4/root/usr");
-    Prefixes.push_back("/opt/rh/devtoolset-3/root/usr");
-    Prefixes.push_back("/opt/rh/devtoolset-2/root/usr");
-  }
-  Prefixes.push_back(SysRoot.str() + "/usr");
-}
-
-/*static*/ void Generic_GCC::GCCInstallationDetector::CollectLibDirsAndTriples(
-    const llvm::Triple &TargetTriple, const llvm::Triple &BiarchTriple,
-    SmallVectorImpl<StringRef> &LibDirs,
-    SmallVectorImpl<StringRef> &TripleAliases,
-    SmallVectorImpl<StringRef> &BiarchLibDirs,
-    SmallVectorImpl<StringRef> &BiarchTripleAliases) {
-  // Declare a bunch of static data sets that we'll select between below. These
-  // are specifically designed to always refer to string literals to avoid any
-  // lifetime or initialization issues.
-  static const char *const AArch64LibDirs[] = {"/lib64", "/lib"};
-  static const char *const AArch64Triples[] = {
-      "aarch64-none-linux-gnu", "aarch64-linux-gnu", "aarch64-redhat-linux",
-      "aarch64-suse-linux", "aarch64-linux-android"};
-  static const char *const AArch64beLibDirs[] = {"/lib"};
-  static const char *const AArch64beTriples[] = {"aarch64_be-none-linux-gnu",
-                                                 "aarch64_be-linux-gnu"};
-
-  static const char *const ARMLibDirs[] = {"/lib"};
-  static const char *const ARMTriples[] = {"arm-linux-gnueabi",
-                                           "arm-linux-androideabi"};
-  static const char *const ARMHFTriples[] = {"arm-linux-gnueabihf",
-                                             "armv7hl-redhat-linux-gnueabi",
-                                             "armv6hl-suse-linux-gnueabi",
-                                             "armv7hl-suse-linux-gnueabi"};
-  static const char *const ARMebLibDirs[] = {"/lib"};
-  static const char *const ARMebTriples[] = {"armeb-linux-gnueabi",
-                                             "armeb-linux-androideabi"};
-  static const char *const ARMebHFTriples[] = {
-      "armeb-linux-gnueabihf", "armebv7hl-redhat-linux-gnueabi"};
-
-  static const char *const X86_64LibDirs[] = {"/lib64", "/lib"};
-  static const char *const X86_64Triples[] = {
-      "x86_64-linux-gnu",       "x86_64-unknown-linux-gnu",
-      "x86_64-pc-linux-gnu",    "x86_64-redhat-linux6E",
-      "x86_64-redhat-linux",    "x86_64-suse-linux",
-      "x86_64-manbo-linux-gnu", "x86_64-linux-gnu",
-      "x86_64-slackware-linux", "x86_64-unknown-linux",
-      "x86_64-amazon-linux",    "x86_64-linux-android"};
-  static const char *const X32LibDirs[] = {"/libx32"};
-  static const char *const X86LibDirs[] = {"/lib32", "/lib"};
-  static const char *const X86Triples[] = {
-      "i686-linux-gnu",       "i686-pc-linux-gnu",     "i486-linux-gnu",
-      "i386-linux-gnu",       "i386-redhat-linux6E",   "i686-redhat-linux",
-      "i586-redhat-linux",    "i386-redhat-linux",     "i586-suse-linux",
-      "i486-slackware-linux", "i686-montavista-linux", "i586-linux-gnu",
-      "i686-linux-android",   "i386-gnu",              "i486-gnu",
-      "i586-gnu",             "i686-gnu"};
-
-  static const char *const MIPSLibDirs[] = {"/lib"};
-  static const char *const MIPSTriples[] = {
-      "mips-linux-gnu", "mips-mti-linux", "mips-mti-linux-gnu",
-      "mips-img-linux-gnu", "mipsisa32r6-linux-gnu"};
-  static const char *const MIPSELLibDirs[] = {"/lib"};
-  static const char *const MIPSELTriples[] = {
-      "mipsel-linux-gnu", "mips-img-linux-gnu", "mipsisa32r6el-linux-gnu",
-      "mipsel-linux-android"};
-
-  static const char *const MIPS64LibDirs[] = {"/lib64", "/lib"};
-  static const char *const MIPS64Triples[] = {
-      "mips64-linux-gnu",      "mips-mti-linux-gnu",
-      "mips-img-linux-gnu",    "mips64-linux-gnuabi64",
-      "mipsisa64r6-linux-gnu", "mipsisa64r6-linux-gnuabi64"};
-  static const char *const MIPS64ELLibDirs[] = {"/lib64", "/lib"};
-  static const char *const MIPS64ELTriples[] = {
-      "mips64el-linux-gnu",      "mips-mti-linux-gnu",
-      "mips-img-linux-gnu",      "mips64el-linux-gnuabi64",
-      "mipsisa64r6el-linux-gnu", "mipsisa64r6el-linux-gnuabi64",
-      "mips64el-linux-android"};
-
-  static const char *const MIPSN32LibDirs[] = {"/lib32"};
-  static const char *const MIPSN32Triples[] = {"mips64-linux-gnuabin32",
-                                               "mipsisa64r6-linux-gnuabin32"};
-  static const char *const MIPSN32ELLibDirs[] = {"/lib32"};
-  static const char *const MIPSN32ELTriples[] = {
-      "mips64el-linux-gnuabin32", "mipsisa64r6el-linux-gnuabin32"};
-
-  static const char *const MSP430LibDirs[] = {"/lib"};
-  static const char *const MSP430Triples[] = {"msp430-elf"};
-
-  static const char *const PPCLibDirs[] = {"/lib32", "/lib"};
-  static const char *const PPCTriples[] = {
-      "powerpc-linux-gnu", "powerpc-unknown-linux-gnu", "powerpc-linux-gnuspe",
-      "powerpc-suse-linux", "powerpc-montavista-linuxspe"};
-  static const char *const PPC64LibDirs[] = {"/lib64", "/lib"};
-  static const char *const PPC64Triples[] = {
-      "powerpc64-linux-gnu", "powerpc64-unknown-linux-gnu",
-      "powerpc64-suse-linux", "ppc64-redhat-linux"};
-  static const char *const PPC64LELibDirs[] = {"/lib64", "/lib"};
-  static const char *const PPC64LETriples[] = {
-      "powerpc64le-linux-gnu", "powerpc64le-unknown-linux-gnu",
-      "powerpc64le-suse-linux", "ppc64le-redhat-linux"};
-
-  static const char *const RISCV32LibDirs[] = {"/lib", "/lib32"};
-  static const char *const RISCVTriples[] = {"riscv32-unknown-linux-gnu",
-                                             "riscv64-unknown-linux-gnu",
-                                             "riscv32-unknown-elf"};
-
-  static const char *const SPARCv8LibDirs[] = {"/lib32", "/lib"};
-  static const char *const SPARCv8Triples[] = {"sparc-linux-gnu",
-                                               "sparcv8-linux-gnu"};
-  static const char *const SPARCv9LibDirs[] = {"/lib64", "/lib"};
-  static const char *const SPARCv9Triples[] = {"sparc64-linux-gnu",
-                                               "sparcv9-linux-gnu"};
-
-  static const char *const SystemZLibDirs[] = {"/lib64", "/lib"};
-  static const char *const SystemZTriples[] = {
-      "s390x-linux-gnu", "s390x-unknown-linux-gnu", "s390x-ibm-linux-gnu",
-      "s390x-suse-linux", "s390x-redhat-linux"};
-
-
-  using std::begin;
-  using std::end;
-
-  if (TargetTriple.getOS() == llvm::Triple::Solaris) {
-    static const char *const SolarisLibDirs[] = {"/lib"};
-    static const char *const SolarisSparcV8Triples[] = {
-        "sparc-sun-solaris2.11", "sparc-sun-solaris2.12"};
-    static const char *const SolarisSparcV9Triples[] = {
-        "sparcv9-sun-solaris2.11", "sparcv9-sun-solaris2.12"};
-    static const char *const SolarisX86Triples[] = {"i386-pc-solaris2.11",
-                                                    "i386-pc-solaris2.12"};
-    static const char *const SolarisX86_64Triples[] = {"x86_64-pc-solaris2.11",
-                                                       "x86_64-pc-solaris2.12"};
-    LibDirs.append(begin(SolarisLibDirs), end(SolarisLibDirs));
-    BiarchLibDirs.append(begin(SolarisLibDirs), end(SolarisLibDirs));
-    switch (TargetTriple.getArch()) {
-    case llvm::Triple::x86:
-      TripleAliases.append(begin(SolarisX86Triples), end(SolarisX86Triples));
-      BiarchTripleAliases.append(begin(SolarisX86_64Triples),
-                                 end(SolarisX86_64Triples));
-      break;
-    case llvm::Triple::x86_64:
-      TripleAliases.append(begin(SolarisX86_64Triples),
-                           end(SolarisX86_64Triples));
-      BiarchTripleAliases.append(begin(SolarisX86Triples),
-                                 end(SolarisX86Triples));
-      break;
-    case llvm::Triple::sparc:
-      TripleAliases.append(begin(SolarisSparcV8Triples),
-                           end(SolarisSparcV8Triples));
-      BiarchTripleAliases.append(begin(SolarisSparcV9Triples),
-                                 end(SolarisSparcV9Triples));
-      break;
-    case llvm::Triple::sparcv9:
-      TripleAliases.append(begin(SolarisSparcV9Triples),
-                           end(SolarisSparcV9Triples));
-      BiarchTripleAliases.append(begin(SolarisSparcV8Triples),
-                                 end(SolarisSparcV8Triples));
-      break;
-    default:
-      break;
-    }
-    return;
-  }
-
-  // Android targets should not use GNU/Linux tools or libraries.
-  if (TargetTriple.isAndroid()) {
-    static const char *const AArch64AndroidTriples[] = {
-        "aarch64-linux-android"};
-    static const char *const ARMAndroidTriples[] = {"arm-linux-androideabi"};
-    static const char *const MIPSELAndroidTriples[] = {"mipsel-linux-android"};
-    static const char *const MIPS64ELAndroidTriples[] = {
-        "mips64el-linux-android"};
-    static const char *const X86AndroidTriples[] = {"i686-linux-android"};
-    static const char *const X86_64AndroidTriples[] = {"x86_64-linux-android"};
-
-    switch (TargetTriple.getArch()) {
-    case llvm::Triple::aarch64:
-      LibDirs.append(begin(AArch64LibDirs), end(AArch64LibDirs));
-      TripleAliases.append(begin(AArch64AndroidTriples),
-                           end(AArch64AndroidTriples));
-      break;
-    case llvm::Triple::arm:
-    case llvm::Triple::thumb:
-      LibDirs.append(begin(ARMLibDirs), end(ARMLibDirs));
-      TripleAliases.append(begin(ARMAndroidTriples), end(ARMAndroidTriples));
-      break;
-    case llvm::Triple::mipsel:
-      LibDirs.append(begin(MIPSELLibDirs), end(MIPSELLibDirs));
-      TripleAliases.append(begin(MIPSELAndroidTriples),
-                           end(MIPSELAndroidTriples));
-      BiarchLibDirs.append(begin(MIPS64ELLibDirs), end(MIPS64ELLibDirs));
-      BiarchTripleAliases.append(begin(MIPS64ELAndroidTriples),
-                                 end(MIPS64ELAndroidTriples));
-      break;
-    case llvm::Triple::mips64el:
-      LibDirs.append(begin(MIPS64ELLibDirs), end(MIPS64ELLibDirs));
-      TripleAliases.append(begin(MIPS64ELAndroidTriples),
-                           end(MIPS64ELAndroidTriples));
-      BiarchLibDirs.append(begin(MIPSELLibDirs), end(MIPSELLibDirs));
-      BiarchTripleAliases.append(begin(MIPSELAndroidTriples),
-                                 end(MIPSELAndroidTriples));
-      break;
-    case llvm::Triple::x86_64:
-      LibDirs.append(begin(X86_64LibDirs), end(X86_64LibDirs));
-      TripleAliases.append(begin(X86_64AndroidTriples),
-                           end(X86_64AndroidTriples));
-      BiarchLibDirs.append(begin(X86LibDirs), end(X86LibDirs));
-      BiarchTripleAliases.append(begin(X86AndroidTriples),
-                                 end(X86AndroidTriples));
-      break;
-    case llvm::Triple::x86:
-      LibDirs.append(begin(X86LibDirs), end(X86LibDirs));
-      TripleAliases.append(begin(X86AndroidTriples), end(X86AndroidTriples));
-      BiarchLibDirs.append(begin(X86_64LibDirs), end(X86_64LibDirs));
-      BiarchTripleAliases.append(begin(X86_64AndroidTriples),
-                                 end(X86_64AndroidTriples));
-      break;
-    default:
-      break;
-    }
-
-    return;
-  }
-
-  switch (TargetTriple.getArch()) {
-  case llvm::Triple::aarch64:
-    LibDirs.append(begin(AArch64LibDirs), end(AArch64LibDirs));
-    TripleAliases.append(begin(AArch64Triples), end(AArch64Triples));
-    BiarchLibDirs.append(begin(AArch64LibDirs), end(AArch64LibDirs));
-    BiarchTripleAliases.append(begin(AArch64Triples), end(AArch64Triples));
-    break;
-  case llvm::Triple::aarch64_be:
-    LibDirs.append(begin(AArch64beLibDirs), end(AArch64beLibDirs));
-    TripleAliases.append(begin(AArch64beTriples), end(AArch64beTriples));
-    BiarchLibDirs.append(begin(AArch64beLibDirs), end(AArch64beLibDirs));
-    BiarchTripleAliases.append(begin(AArch64beTriples), end(AArch64beTriples));
-    break;
-  case llvm::Triple::arm:
-  case llvm::Triple::thumb:
-    LibDirs.append(begin(ARMLibDirs), end(ARMLibDirs));
-    if (TargetTriple.getEnvironment() == llvm::Triple::GNUEABIHF) {
-      TripleAliases.append(begin(ARMHFTriples), end(ARMHFTriples));
-    } else {
-      TripleAliases.append(begin(ARMTriples), end(ARMTriples));
-    }
-    break;
-  case llvm::Triple::armeb:
-  case llvm::Triple::thumbeb:
-    LibDirs.append(begin(ARMebLibDirs), end(ARMebLibDirs));
-    if (TargetTriple.getEnvironment() == llvm::Triple::GNUEABIHF) {
-      TripleAliases.append(begin(ARMebHFTriples), end(ARMebHFTriples));
-    } else {
-      TripleAliases.append(begin(ARMebTriples), end(ARMebTriples));
-    }
-    break;
-  case llvm::Triple::x86_64:
-    LibDirs.append(begin(X86_64LibDirs), end(X86_64LibDirs));
-    TripleAliases.append(begin(X86_64Triples), end(X86_64Triples));
-    // x32 is always available when x86_64 is available, so adding it as
-    // secondary arch with x86_64 triples
-    if (TargetTriple.getEnvironment() == llvm::Triple::GNUX32) {
-      BiarchLibDirs.append(begin(X32LibDirs), end(X32LibDirs));
-      BiarchTripleAliases.append(begin(X86_64Triples), end(X86_64Triples));
-    } else {
-      BiarchLibDirs.append(begin(X86LibDirs), end(X86LibDirs));
-      BiarchTripleAliases.append(begin(X86Triples), end(X86Triples));
-    }
-    break;
-  case llvm::Triple::x86:
-    LibDirs.append(begin(X86LibDirs), end(X86LibDirs));
-    // MCU toolchain is 32 bit only and its triple alias is TargetTriple
-    // itself, which will be appended below.
-    if (!TargetTriple.isOSIAMCU()) {
-      TripleAliases.append(begin(X86Triples), end(X86Triples));
-      BiarchLibDirs.append(begin(X86_64LibDirs), end(X86_64LibDirs));
-      BiarchTripleAliases.append(begin(X86_64Triples), end(X86_64Triples));
-    }
-    break;
-  case llvm::Triple::mips:
-    LibDirs.append(begin(MIPSLibDirs), end(MIPSLibDirs));
-    TripleAliases.append(begin(MIPSTriples), end(MIPSTriples));
-    BiarchLibDirs.append(begin(MIPS64LibDirs), end(MIPS64LibDirs));
-    BiarchTripleAliases.append(begin(MIPS64Triples), end(MIPS64Triples));
-    BiarchLibDirs.append(begin(MIPSN32LibDirs), end(MIPSN32LibDirs));
-    BiarchTripleAliases.append(begin(MIPSN32Triples), end(MIPSN32Triples));
-    break;
-  case llvm::Triple::mipsel:
-    LibDirs.append(begin(MIPSELLibDirs), end(MIPSELLibDirs));
-    TripleAliases.append(begin(MIPSELTriples), end(MIPSELTriples));
-    TripleAliases.append(begin(MIPSTriples), end(MIPSTriples));
-    BiarchLibDirs.append(begin(MIPS64ELLibDirs), end(MIPS64ELLibDirs));
-    BiarchTripleAliases.append(begin(MIPS64ELTriples), end(MIPS64ELTriples));
-    BiarchLibDirs.append(begin(MIPSN32ELLibDirs), end(MIPSN32ELLibDirs));
-    BiarchTripleAliases.append(begin(MIPSN32ELTriples), end(MIPSN32ELTriples));
-    break;
-  case llvm::Triple::mips64:
-    LibDirs.append(begin(MIPS64LibDirs), end(MIPS64LibDirs));
-    TripleAliases.append(begin(MIPS64Triples), end(MIPS64Triples));
-    BiarchLibDirs.append(begin(MIPSLibDirs), end(MIPSLibDirs));
-    BiarchTripleAliases.append(begin(MIPSTriples), end(MIPSTriples));
-    BiarchLibDirs.append(begin(MIPSN32LibDirs), end(MIPSN32LibDirs));
-    BiarchTripleAliases.append(begin(MIPSN32Triples), end(MIPSN32Triples));
-    break;
-  case llvm::Triple::mips64el:
-    LibDirs.append(begin(MIPS64ELLibDirs), end(MIPS64ELLibDirs));
-    TripleAliases.append(begin(MIPS64ELTriples), end(MIPS64ELTriples));
-    BiarchLibDirs.append(begin(MIPSELLibDirs), end(MIPSELLibDirs));
-    BiarchTripleAliases.append(begin(MIPSELTriples), end(MIPSELTriples));
-    BiarchLibDirs.append(begin(MIPSN32ELLibDirs), end(MIPSN32ELLibDirs));
-    BiarchTripleAliases.append(begin(MIPSN32ELTriples), end(MIPSN32ELTriples));
-    BiarchTripleAliases.append(begin(MIPSTriples), end(MIPSTriples));
-    break;
-  case llvm::Triple::msp430:
-    LibDirs.append(begin(MSP430LibDirs), end(MSP430LibDirs));
-    TripleAliases.append(begin(MSP430Triples), end(MSP430Triples));
-    break;
-  case llvm::Triple::ppc:
-    LibDirs.append(begin(PPCLibDirs), end(PPCLibDirs));
-    TripleAliases.append(begin(PPCTriples), end(PPCTriples));
-    BiarchLibDirs.append(begin(PPC64LibDirs), end(PPC64LibDirs));
-    BiarchTripleAliases.append(begin(PPC64Triples), end(PPC64Triples));
-    break;
-  case llvm::Triple::ppc64:
-    LibDirs.append(begin(PPC64LibDirs), end(PPC64LibDirs));
-    TripleAliases.append(begin(PPC64Triples), end(PPC64Triples));
-    BiarchLibDirs.append(begin(PPCLibDirs), end(PPCLibDirs));
-    BiarchTripleAliases.append(begin(PPCTriples), end(PPCTriples));
-    break;
-  case llvm::Triple::ppc64le:
-    LibDirs.append(begin(PPC64LELibDirs), end(PPC64LELibDirs));
-    TripleAliases.append(begin(PPC64LETriples), end(PPC64LETriples));
-    break;
-  case llvm::Triple::riscv32:
-    LibDirs.append(begin(RISCV32LibDirs), end(RISCV32LibDirs));
-    BiarchLibDirs.append(begin(RISCV32LibDirs), end(RISCV32LibDirs));
-    TripleAliases.append(begin(RISCVTriples), end(RISCVTriples));
-    BiarchTripleAliases.append(begin(RISCVTriples), end(RISCVTriples));
-    break;
-  case llvm::Triple::sparc:
-  case llvm::Triple::sparcel:
-    LibDirs.append(begin(SPARCv8LibDirs), end(SPARCv8LibDirs));
-    TripleAliases.append(begin(SPARCv8Triples), end(SPARCv8Triples));
-    BiarchLibDirs.append(begin(SPARCv9LibDirs), end(SPARCv9LibDirs));
-    BiarchTripleAliases.append(begin(SPARCv9Triples), end(SPARCv9Triples));
-    break;
-  case llvm::Triple::sparcv9:
-    LibDirs.append(begin(SPARCv9LibDirs), end(SPARCv9LibDirs));
-    TripleAliases.append(begin(SPARCv9Triples), end(SPARCv9Triples));
-    BiarchLibDirs.append(begin(SPARCv8LibDirs), end(SPARCv8LibDirs));
-    BiarchTripleAliases.append(begin(SPARCv8Triples), end(SPARCv8Triples));
-    break;
-  case llvm::Triple::systemz:
-    LibDirs.append(begin(SystemZLibDirs), end(SystemZLibDirs));
-    TripleAliases.append(begin(SystemZTriples), end(SystemZTriples));
-    break;
-  default:
-    // By default, just rely on the standard lib directories and the original
-    // triple.
-    break;
-  }
-
-  // Always append the drivers target triple to the end, in case it doesn't
-  // match any of our aliases.
-  TripleAliases.push_back(TargetTriple.str());
-
-  // Also include the multiarch variant if it's different.
-  if (TargetTriple.str() != BiarchTriple.str())
-    BiarchTripleAliases.push_back(BiarchTriple.str());
-}
-
-bool Generic_GCC::GCCInstallationDetector::ScanGCCForMultilibs(
-    const llvm::Triple &TargetTriple, const ArgList &Args,
-    StringRef Path, bool NeedsBiarchSuffix) {
-  llvm::Triple::ArchType TargetArch = TargetTriple.getArch();
-  DetectedMultilibs Detected;
-
-  // Android standalone toolchain could have multilibs for ARM and Thumb.
-  // Debian mips multilibs behave more like the rest of the biarch ones,
-  // so handle them there
-  if (isArmOrThumbArch(TargetArch) && TargetTriple.isAndroid()) {
-    // It should also work without multilibs in a simplified toolchain.
-    findAndroidArmMultilibs(D, TargetTriple, Path, Args, Detected);
-  } else if (TargetTriple.isMIPS()) {
-    if (!findMIPSMultilibs(D, TargetTriple, Path, Args, Detected))
-      return false;
-  } else if (isRISCV(TargetArch)) {
-    findRISCVMultilibs(D, TargetTriple, Path, Args, Detected);
-  } else if (isMSP430(TargetArch)) {
-    findMSP430Multilibs(D, TargetTriple, Path, Args, Detected);
-  } else if (!findBiarchMultilibs(D, TargetTriple, Path, Args,
-                                  NeedsBiarchSuffix, Detected)) {
-    return false;
-  }
-
-  Multilibs = Detected.Multilibs;
-  SelectedMultilib = Detected.SelectedMultilib;
-  BiarchSibling = Detected.BiarchSibling;
-
-  return true;
-}
-
-void Generic_GCC::GCCInstallationDetector::ScanLibDirForGCCTriple(
-    const llvm::Triple &TargetTriple, const ArgList &Args,
-    const std::string &LibDir, StringRef CandidateTriple,
-    bool NeedsBiarchSuffix) {
-  llvm::Triple::ArchType TargetArch = TargetTriple.getArch();
-  // Locations relative to the system lib directory where GCC's triple-specific
-  // directories might reside.
-  struct GCCLibSuffix {
-    // Path from system lib directory to GCC triple-specific directory.
-    std::string LibSuffix;
-    // Path from GCC triple-specific directory back to system lib directory.
-    // This is one '..' component per component in LibSuffix.
-    StringRef ReversePath;
-    // Whether this library suffix is relevant for the triple.
-    bool Active;
-  } Suffixes[] = {
-      // This is the normal place.
-      {"gcc/" + CandidateTriple.str(), "../..", true},
-
-      // Debian puts cross-compilers in gcc-cross.
-      {"gcc-cross/" + CandidateTriple.str(), "../..",
-       TargetTriple.getOS() != llvm::Triple::Solaris},
-
-      // The Freescale PPC SDK has the gcc libraries in
-      // <sysroot>/usr/lib/<triple>/x.y.z so have a look there as well. Only do
-      // this on Freescale triples, though, since some systems put a *lot* of
-      // files in that location, not just GCC installation data.
-      {CandidateTriple.str(), "..",
-       TargetTriple.getVendor() == llvm::Triple::Freescale ||
-       TargetTriple.getVendor() == llvm::Triple::OpenEmbedded},
-
-      // Natively multiarch systems sometimes put the GCC triple-specific
-      // directory within their multiarch lib directory, resulting in the
-      // triple appearing twice.
-      {CandidateTriple.str() + "/gcc/" + CandidateTriple.str(), "../../..",
-       TargetTriple.getOS() != llvm::Triple::Solaris},
-
-      // Deal with cases (on Ubuntu) where the system architecture could be i386
-      // but the GCC target architecture could be (say) i686.
-      // FIXME: It may be worthwhile to generalize this and look for a second
-      // triple.
-      {"i386-linux-gnu/gcc/" + CandidateTriple.str(), "../../..",
-       (TargetArch == llvm::Triple::x86 &&
-        TargetTriple.getOS() != llvm::Triple::Solaris)},
-      {"i386-gnu/gcc/" + CandidateTriple.str(), "../../..",
-       (TargetArch == llvm::Triple::x86 &&
-        TargetTriple.getOS() != llvm::Triple::Solaris)}};
-
-  for (auto &Suffix : Suffixes) {
-    if (!Suffix.Active)
-      continue;
-
-    StringRef LibSuffix = Suffix.LibSuffix;
-    std::error_code EC;
-    for (llvm::vfs::directory_iterator
-             LI = D.getVFS().dir_begin(LibDir + "/" + LibSuffix, EC),
-             LE;
-         !EC && LI != LE; LI = LI.increment(EC)) {
-      StringRef VersionText = llvm::sys::path::filename(LI->path());
-      GCCVersion CandidateVersion = GCCVersion::Parse(VersionText);
-      if (CandidateVersion.Major != -1) // Filter obviously bad entries.
-        if (!CandidateGCCInstallPaths.insert(LI->path()).second)
-          continue; // Saw this path before; no need to look at it again.
-      if (CandidateVersion.isOlderThan(4, 1, 1))
-        continue;
-      if (CandidateVersion <= Version)
-        continue;
-
-      if (!ScanGCCForMultilibs(TargetTriple, Args, LI->path(),
-                               NeedsBiarchSuffix))
-        continue;
-
-      Version = CandidateVersion;
-      GCCTriple.setTriple(CandidateTriple);
-      // FIXME: We hack together the directory name here instead of
-      // using LI to ensure stable path separators across Windows and
-      // Linux.
-      GCCInstallPath = (LibDir + "/" + LibSuffix + "/" + VersionText).str();
-      GCCParentLibPath = (GCCInstallPath + "/../" + Suffix.ReversePath).str();
-      IsValid = true;
-    }
-  }
-}
-
-bool Generic_GCC::GCCInstallationDetector::ScanGentooConfigs(
-    const llvm::Triple &TargetTriple, const ArgList &Args,
-    const SmallVectorImpl<StringRef> &CandidateTriples,
-    const SmallVectorImpl<StringRef> &CandidateBiarchTriples) {
-  for (StringRef CandidateTriple : CandidateTriples) {
-    if (ScanGentooGccConfig(TargetTriple, Args, CandidateTriple))
-      return true;
-  }
-
-  for (StringRef CandidateTriple : CandidateBiarchTriples) {
-    if (ScanGentooGccConfig(TargetTriple, Args, CandidateTriple, true))
-      return true;
-  }
-  return false;
-}
-
-bool Generic_GCC::GCCInstallationDetector::ScanGentooGccConfig(
-    const llvm::Triple &TargetTriple, const ArgList &Args,
-    StringRef CandidateTriple, bool NeedsBiarchSuffix) {
-  llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> File =
-      D.getVFS().getBufferForFile(D.SysRoot + "/etc/env.d/gcc/config-" +
-                                  CandidateTriple.str());
-  if (File) {
-    SmallVector<StringRef, 2> Lines;
-    File.get()->getBuffer().split(Lines, "\n");
-    for (StringRef Line : Lines) {
-      Line = Line.trim();
-      // CURRENT=triple-version
-      if (!Line.consume_front("CURRENT="))
-        continue;
-      // Process the config file pointed to by CURRENT.
-      llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> ConfigFile =
-          D.getVFS().getBufferForFile(D.SysRoot + "/etc/env.d/gcc/" +
-                                      Line.str());
-      std::pair<StringRef, StringRef> ActiveVersion = Line.rsplit('-');
-      // List of paths to scan for libraries.
-      SmallVector<StringRef, 4> GentooScanPaths;
-      // Scan the Config file to find installed GCC libraries path.
-      // Typical content of the GCC config file:
-      // LDPATH="/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.x:/usr/lib/gcc/
-      // (continued from previous line) x86_64-pc-linux-gnu/4.9.x/32"
-      // MANPATH="/usr/share/gcc-data/x86_64-pc-linux-gnu/4.9.x/man"
-      // INFOPATH="/usr/share/gcc-data/x86_64-pc-linux-gnu/4.9.x/info"
-      // STDCXX_INCDIR="/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.x/include/g++-v4"
-      // We are looking for the paths listed in LDPATH=... .
-      if (ConfigFile) {
-        SmallVector<StringRef, 2> ConfigLines;
-        ConfigFile.get()->getBuffer().split(ConfigLines, "\n");
-        for (StringRef ConfLine : ConfigLines) {
-          ConfLine = ConfLine.trim();
-          if (ConfLine.consume_front("LDPATH=")) {
-            // Drop '"' from front and back if present.
-            ConfLine.consume_back("\"");
-            ConfLine.consume_front("\"");
-            // Get all paths sperated by ':'
-            ConfLine.split(GentooScanPaths, ':', -1, /*AllowEmpty*/ false);
-          }
-        }
-      }
-      // Test the path based on the version in /etc/env.d/gcc/config-{tuple}.
-      std::string basePath = "/usr/lib/gcc/" + ActiveVersion.first.str() + "/"
-          + ActiveVersion.second.str();
-      GentooScanPaths.push_back(StringRef(basePath));
-
-      // Scan all paths for GCC libraries.
-      for (const auto &GentooScanPath : GentooScanPaths) {
-        std::string GentooPath = D.SysRoot + std::string(GentooScanPath);
-        if (D.getVFS().exists(GentooPath + "/crtbegin.o")) {
-          if (!ScanGCCForMultilibs(TargetTriple, Args, GentooPath,
-                                   NeedsBiarchSuffix))
-            continue;
-
-          Version = GCCVersion::Parse(ActiveVersion.second);
-          GCCInstallPath = GentooPath;
-          GCCParentLibPath = GentooPath + std::string("/../../..");
-          GCCTriple.setTriple(ActiveVersion.first);
-          IsValid = true;
-          return true;
-        }
-      }
-    }
-  }
-
-  return false;
-}
-
-Generic_GCC::Generic_GCC(const Driver &D, const llvm::Triple &Triple,
-                         const ArgList &Args)
-    : ToolChain(D, Triple, Args), GCCInstallation(D),
-      CudaInstallation(D, Triple, Args) {
-  getProgramPaths().push_back(getDriver().getInstalledDir());
-  if (getDriver().getInstalledDir() != getDriver().Dir)
-    getProgramPaths().push_back(getDriver().Dir);
-}
-
-Generic_GCC::~Generic_GCC() {}
-
-Tool *Generic_GCC::getTool(Action::ActionClass AC) const {
-  switch (AC) {
-  case Action::PreprocessJobClass:
-    if (!Preprocess)
-      Preprocess.reset(new clang::driver::tools::gcc::Preprocessor(*this));
-    return Preprocess.get();
-  case Action::CompileJobClass:
-    if (!Compile)
-      Compile.reset(new tools::gcc::Compiler(*this));
-    return Compile.get();
-  default:
-    return ToolChain::getTool(AC);
-  }
-}
-
-Tool *Generic_GCC::buildAssembler() const {
-  return new tools::gnutools::Assembler(*this);
-}
-
-Tool *Generic_GCC::buildLinker() const { return new tools::gcc::Linker(*this); }
-
-void Generic_GCC::printVerboseInfo(raw_ostream &OS) const {
-  // Print the information about how we detected the GCC installation.
-  GCCInstallation.print(OS);
-  CudaInstallation.print(OS);
-}
-
-bool Generic_GCC::IsUnwindTablesDefault(const ArgList &Args) const {
-  return getArch() == llvm::Triple::x86_64;
-}
-
-bool Generic_GCC::isPICDefault() const {
-  switch (getArch()) {
-  case llvm::Triple::x86_64:
-    return getTriple().isOSWindows();
-  case llvm::Triple::ppc64:
-    // Big endian PPC is PIC by default
-    return !getTriple().isOSBinFormatMachO() && !getTriple().isMacOSX();
-  case llvm::Triple::mips64:
-  case llvm::Triple::mips64el:
-    return true;
-  default:
-    return false;
-  }
-}
-
-bool Generic_GCC::isPIEDefault() const { return false; }
-
-bool Generic_GCC::isPICDefaultForced() const {
-  return getArch() == llvm::Triple::x86_64 && getTriple().isOSWindows();
-}
-
-bool Generic_GCC::IsIntegratedAssemblerDefault() const {
-  switch (getTriple().getArch()) {
-  case llvm::Triple::x86:
-  case llvm::Triple::x86_64:
-  case llvm::Triple::aarch64:
-  case llvm::Triple::aarch64_be:
-  case llvm::Triple::arm:
-  case llvm::Triple::armeb:
-  case llvm::Triple::avr:
-  case llvm::Triple::bpfel:
-  case llvm::Triple::bpfeb:
-  case llvm::Triple::thumb:
-  case llvm::Triple::thumbeb:
-  case llvm::Triple::ppc:
-  case llvm::Triple::ppc64:
-  case llvm::Triple::ppc64le:
-  case llvm::Triple::riscv32:
-  case llvm::Triple::riscv64:
-  case llvm::Triple::systemz:
-  case llvm::Triple::mips:
-  case llvm::Triple::mipsel:
-  case llvm::Triple::mips64:
-  case llvm::Triple::mips64el:
-  case llvm::Triple::msp430:
-    return true;
-  case llvm::Triple::sparc:
-  case llvm::Triple::sparcel:
-  case llvm::Triple::sparcv9:
-    if (getTriple().isOSSolaris())
-      return true;
-    return false;
-  default:
-    return false;
-  }
-}
-
-void Generic_GCC::AddClangCXXStdlibIncludeArgs(const ArgList &DriverArgs,
-                                               ArgStringList &CC1Args) const {
-  if (DriverArgs.hasArg(options::OPT_nostdlibinc) ||
-      DriverArgs.hasArg(options::OPT_nostdincxx))
-    return;
-
-  switch (GetCXXStdlibType(DriverArgs)) {
-  case ToolChain::CST_Libcxx:
-    addLibCxxIncludePaths(DriverArgs, CC1Args);
-    break;
-
-  case ToolChain::CST_Libstdcxx:
-    addLibStdCxxIncludePaths(DriverArgs, CC1Args);
-    break;
-  }
-}
-
-void
-Generic_GCC::addLibCxxIncludePaths(const llvm::opt::ArgList &DriverArgs,
-                                   llvm::opt::ArgStringList &CC1Args) const {
-  // FIXME: The Linux behavior would probaby be a better approach here.
-  addSystemInclude(DriverArgs, CC1Args,
-                   getDriver().SysRoot + "/usr/include/c++/v1");
-}
-
-void
-Generic_GCC::addLibStdCxxIncludePaths(const llvm::opt::ArgList &DriverArgs,
-                                      llvm::opt::ArgStringList &CC1Args) const {
-  // By default, we don't assume we know where libstdc++ might be installed.
-  // FIXME: If we have a valid GCCInstallation, use it.
-}
-
-/// Helper to add the variant paths of a libstdc++ installation.
-bool Generic_GCC::addLibStdCXXIncludePaths(
-    Twine Base, Twine Suffix, StringRef GCCTriple, StringRef GCCMultiarchTriple,
-    StringRef TargetMultiarchTriple, Twine IncludeSuffix,
-    const ArgList &DriverArgs, ArgStringList &CC1Args) const {
-  if (!getVFS().exists(Base + Suffix))
-    return false;
-
-  addSystemInclude(DriverArgs, CC1Args, Base + Suffix);
-
-  // The vanilla GCC layout of libstdc++ headers uses a triple subdirectory. If
-  // that path exists or we have neither a GCC nor target multiarch triple, use
-  // this vanilla search path.
-  if ((GCCMultiarchTriple.empty() && TargetMultiarchTriple.empty()) ||
-      getVFS().exists(Base + Suffix + "/" + GCCTriple + IncludeSuffix)) {
-    addSystemInclude(DriverArgs, CC1Args,
-                     Base + Suffix + "/" + GCCTriple + IncludeSuffix);
-  } else {
-    // Otherwise try to use multiarch naming schemes which have normalized the
-    // triples and put the triple before the suffix.
-    //
-    // GCC surprisingly uses *both* the GCC triple with a multilib suffix and
-    // the target triple, so we support that here.
-    addSystemInclude(DriverArgs, CC1Args,
-                     Base + "/" + GCCMultiarchTriple + Suffix + IncludeSuffix);
-    addSystemInclude(DriverArgs, CC1Args,
-                     Base + "/" + TargetMultiarchTriple + Suffix);
-  }
-
-  addSystemInclude(DriverArgs, CC1Args, Base + Suffix + "/backward");
-  return true;
-}
-
-llvm::opt::DerivedArgList *
-Generic_GCC::TranslateArgs(const llvm::opt::DerivedArgList &Args, StringRef,
-                           Action::OffloadKind DeviceOffloadKind) const {
-
-  // If this tool chain is used for an OpenMP offloading device we have to make
-  // sure we always generate a shared library regardless of the commands the
-  // user passed to the host. This is required because the runtime library
-  // is required to load the device image dynamically at run time.
-  if (DeviceOffloadKind == Action::OFK_OpenMP) {
-    DerivedArgList *DAL = new DerivedArgList(Args.getBaseArgs());
-    const OptTable &Opts = getDriver().getOpts();
-
-    // Request the shared library. Given that these options are decided
-    // implicitly, they do not refer to any base argument.
-    DAL->AddFlagArg(/*BaseArg=*/nullptr, Opts.getOption(options::OPT_shared));
-    DAL->AddFlagArg(/*BaseArg=*/nullptr, Opts.getOption(options::OPT_fPIC));
-
-    // Filter all the arguments we don't care passing to the offloading
-    // toolchain as they can mess up with the creation of a shared library.
-    for (auto *A : Args) {
-      switch ((options::ID)A->getOption().getID()) {
-      default:
-        DAL->append(A);
-        break;
-      case options::OPT_shared:
-      case options::OPT_dynamic:
-      case options::OPT_static:
-      case options::OPT_fPIC:
-      case options::OPT_fno_PIC:
-      case options::OPT_fpic:
-      case options::OPT_fno_pic:
-      case options::OPT_fPIE:
-      case options::OPT_fno_PIE:
-      case options::OPT_fpie:
-      case options::OPT_fno_pie:
-        break;
-      }
-    }
-    return DAL;
-  }
-  return nullptr;
-}
-
-void Generic_ELF::anchor() {}
-
-void Generic_ELF::addClangTargetOptions(const ArgList &DriverArgs,
-                                        ArgStringList &CC1Args,
-                                        Action::OffloadKind) const {
-  const Generic_GCC::GCCVersion &V = GCCInstallation.getVersion();
-  bool UseInitArrayDefault =
-      getTriple().getArch() == llvm::Triple::aarch64 ||
-      getTriple().getArch() == llvm::Triple::aarch64_be ||
-      (getTriple().isOSFreeBSD() &&
-       getTriple().getOSMajorVersion() >= 12) ||
-      (getTriple().getOS() == llvm::Triple::Linux &&
-       ((!GCCInstallation.isValid() || !V.isOlderThan(4, 7, 0)) ||
-        getTriple().isAndroid())) ||
-      getTriple().getOS() == llvm::Triple::NaCl ||
-      (getTriple().getVendor() == llvm::Triple::MipsTechnologies &&
-       !getTriple().hasEnvironment()) ||
-      getTriple().getOS() == llvm::Triple::Solaris ||
-      getTriple().getArch() == llvm::Triple::riscv32 ||
-      getTriple().getArch() == llvm::Triple::riscv64;
-
-  if (DriverArgs.hasFlag(options::OPT_fuse_init_array,
-                         options::OPT_fno_use_init_array, UseInitArrayDefault))
-    CC1Args.push_back("-fuse-init-array");
-}