lib/Driver/ToolChains/AIX.cpp - llvm-project/clang - Git at Google

 //===--- AIX.cpp - AIX ToolChain Implementations ----------------*- C++ -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//

 #include "AIX.h"
 #include "Arch/PPC.h"
 #include "CommonArgs.h"
 #include "clang/Driver/Compilation.h"
 #include "clang/Driver/Options.h"
 #include "clang/Driver/SanitizerArgs.h"
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/Option/ArgList.h"
 #include "llvm/ProfileData/InstrProf.h"
 #include "llvm/Support/Path.h"

 #include <set>

 using AIX = clang::driver::toolchains::AIX;
 using namespace clang::driver;
 using namespace clang::driver::tools;
 using namespace clang::driver::toolchains;

 using namespace llvm::opt;
 using namespace llvm::sys;

 void aix::Assembler::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;

   const bool IsArch32Bit = getToolChain().getTriple().isArch32Bit();
   const bool IsArch64Bit = getToolChain().getTriple().isArch64Bit();
   // Only support 32 and 64 bit.
   if (!IsArch32Bit && !IsArch64Bit)
     llvm_unreachable("Unsupported bit width value.");

   if (Arg *A = C.getArgs().getLastArg(options::OPT_G)) {
     D.Diag(diag::err_drv_unsupported_opt_for_target)
         << A->getSpelling() << D.getTargetTriple();
   }

   // Specify the mode in which the as(1) command operates.
   if (IsArch32Bit) {
     CmdArgs.push_back("-a32");
   } else {
     // Must be 64-bit, otherwise asserted already.
     CmdArgs.push_back("-a64");
   }

   // Accept any mixture of instructions.
   // On Power for AIX and Linux, this behaviour matches that of GCC for both the
   // user-provided assembler source case and the compiler-produced assembler
   // source case. Yet XL with user-provided assembler source would not add this.
   CmdArgs.push_back("-many");

   Args.AddAllArgValues(CmdArgs, options::OPT_Wa_COMMA, options::OPT_Xassembler);

   // Specify assembler output file.
   assert((Output.isFilename() || Output.isNothing()) && "Invalid output.");
   if (Output.isFilename()) {
     CmdArgs.push_back("-o");
     CmdArgs.push_back(Output.getFilename());
   }

   // Specify assembler input file.
   // The system assembler on AIX takes exactly one input file. The driver is
   // expected to invoke as(1) separately for each assembler source input file.
   if (Inputs.size() != 1)
     llvm_unreachable("Invalid number of input files.");
   const InputInfo &II = Inputs[0];
   assert((II.isFilename() || II.isNothing()) && "Invalid input.");
   if (II.isFilename())
     CmdArgs.push_back(II.getFilename());

   const char *Exec = Args.MakeArgString(getToolChain().GetProgramPath("as"));
   C.addCommand(std::make_unique<Command>(JA, *this, ResponseFileSupport::None(),
                                          Exec, CmdArgs, Inputs, Output));
 }

 // Determine whether there are any linker options that supply an export list
 // (or equivalent information about what to export) being sent to the linker.
 static bool hasExportListLinkerOpts(const ArgStringList &CmdArgs) {
   for (size_t i = 0, Size = CmdArgs.size(); i < Size; ++i) {
     llvm::StringRef ArgString(CmdArgs[i]);

     if (ArgString.starts_with("-bE:") || ArgString.starts_with("-bexport:") ||
         ArgString == "-bexpall" || ArgString == "-bexpfull")
       return true;

     // If we split -b option, check the next opt.
     if (ArgString == "-b" && i + 1 < Size) {
       ++i;
       llvm::StringRef ArgNextString(CmdArgs[i]);
       if (ArgNextString.starts_with("E:") ||
           ArgNextString.starts_with("export:") || ArgNextString == "expall" ||
           ArgNextString == "expfull")
         return true;
     }
   }
   return false;
 }

 void aix::Linker::ConstructJob(Compilation &C, const JobAction &JA,
                                const InputInfo &Output,
                                const InputInfoList &Inputs, const ArgList &Args,
                                const char *LinkingOutput) const {
   const AIX &ToolChain = static_cast<const AIX &>(getToolChain());
   const Driver &D = ToolChain.getDriver();
   ArgStringList CmdArgs;

   const bool IsArch32Bit = ToolChain.getTriple().isArch32Bit();
   const bool IsArch64Bit = ToolChain.getTriple().isArch64Bit();
   // Only support 32 and 64 bit.
   if (!(IsArch32Bit || IsArch64Bit))
     llvm_unreachable("Unsupported bit width value.");

   if (Arg *A = C.getArgs().getLastArg(options::OPT_G)) {
     D.Diag(diag::err_drv_unsupported_opt_for_target)
         << A->getSpelling() << D.getTargetTriple();
   }

   // Force static linking when "-static" is present.
   if (Args.hasArg(options::OPT_static))
     CmdArgs.push_back("-bnso");

   // Add options for shared libraries.
   if (Args.hasArg(options::OPT_shared)) {
     CmdArgs.push_back("-bM:SRE");
     CmdArgs.push_back("-bnoentry");
   }

   if (Args.hasFlag(options::OPT_mxcoff_roptr, options::OPT_mno_xcoff_roptr,
                    false)) {
     if (Args.hasArg(options::OPT_shared))
       D.Diag(diag::err_roptr_cannot_build_shared);

     // The `-mxcoff-roptr` option places constants in RO sections as much as
     // possible. Then `-bforceimprw` changes such sections to RW if they contain
     // imported symbols that need to be resolved.
     CmdArgs.push_back("-bforceimprw");
   }

   // PGO instrumentation generates symbols belonging to special sections, and
   // the linker needs to place all symbols in a particular section together in
   // memory; the AIX linker does that under an option.
   if (Args.hasFlag(options::OPT_fprofile_arcs, options::OPT_fno_profile_arcs,
                     false) ||
        Args.hasFlag(options::OPT_fprofile_generate,
                     options::OPT_fno_profile_generate, false) ||
        Args.hasFlag(options::OPT_fprofile_generate_EQ,
                     options::OPT_fno_profile_generate, false) ||
        Args.hasFlag(options::OPT_fprofile_instr_generate,
                     options::OPT_fno_profile_instr_generate, false) ||
        Args.hasFlag(options::OPT_fprofile_instr_generate_EQ,
                     options::OPT_fno_profile_instr_generate, false) ||
        Args.hasFlag(options::OPT_fcs_profile_generate,
                     options::OPT_fno_profile_generate, false) ||
        Args.hasFlag(options::OPT_fcs_profile_generate_EQ,
                     options::OPT_fno_profile_generate, false) ||
        Args.hasArg(options::OPT_fcreate_profile) ||
        Args.hasArg(options::OPT_coverage))
     CmdArgs.push_back("-bdbg:namedsects:ss");

   if (Arg *A =
           Args.getLastArg(clang::driver::options::OPT_mxcoff_build_id_EQ)) {
     StringRef BuildId = A->getValue();
     if (BuildId[0] != '0' || BuildId[1] != 'x' ||
         BuildId.find_if_not(llvm::isHexDigit, 2) != StringRef::npos)
       ToolChain.getDriver().Diag(diag::err_drv_unsupported_option_argument)
           << A->getSpelling() << BuildId;
     else {
       std::string LinkerFlag = "-bdbg:ldrinfo:xcoff_binary_id:0x";
       if (BuildId.size() % 2) // Prepend a 0 if odd number of digits.
         LinkerFlag += "0";
       LinkerFlag += BuildId.drop_front(2).lower();
       CmdArgs.push_back(Args.MakeArgString(LinkerFlag));
     }
   }

   // Specify linker output file.
   assert((Output.isFilename() || Output.isNothing()) && "Invalid output.");
   if (Output.isFilename()) {
     CmdArgs.push_back("-o");
     CmdArgs.push_back(Output.getFilename());
   }

   // Set linking mode (i.e., 32/64-bit) and the address of
   // text and data sections based on arch bit width.
   if (IsArch32Bit) {
     CmdArgs.push_back("-b32");
     CmdArgs.push_back("-bpT:0x10000000");
     CmdArgs.push_back("-bpD:0x20000000");
   } else {
     // Must be 64-bit, otherwise asserted already.
     CmdArgs.push_back("-b64");
     CmdArgs.push_back("-bpT:0x100000000");
     CmdArgs.push_back("-bpD:0x110000000");
   }

   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles,
                    options::OPT_shared, options::OPT_r)) {
     auto getCrt0Basename = [&Args, IsArch32Bit] {
       if (Arg *A = Args.getLastArgNoClaim(options::OPT_p, options::OPT_pg)) {
         // Enable gprofiling when "-pg" is specified.
         if (A->getOption().matches(options::OPT_pg))
           return IsArch32Bit ? "gcrt0.o" : "gcrt0_64.o";
         // Enable profiling when "-p" is specified.
         return IsArch32Bit ? "mcrt0.o" : "mcrt0_64.o";
       }
       return IsArch32Bit ? "crt0.o" : "crt0_64.o";
     };

     CmdArgs.push_back(
         Args.MakeArgString(ToolChain.GetFilePath(getCrt0Basename())));

     CmdArgs.push_back(Args.MakeArgString(
         ToolChain.GetFilePath(IsArch32Bit ? "crti.o" : "crti_64.o")));
   }

   // Collect all static constructor and destructor functions in both C and CXX
   // language link invocations. This has to come before AddLinkerInputs as the
   // implied option needs to precede any other '-bcdtors' settings or
   // '-bnocdtors' that '-Wl' might forward.
   CmdArgs.push_back("-bcdtors:all:0:s");

   // Specify linker input file(s).
   AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);

   if (D.isUsingLTO()) {
     assert(!Inputs.empty() && "Must have at least one input.");
     // Find the first filename InputInfo object.
     auto Input = llvm::find_if(
         Inputs, [](const InputInfo &II) -> bool { return II.isFilename(); });
     if (Input == Inputs.end())
       // For a very rare case, all of the inputs to the linker are
       // InputArg. If that happens, just use the first InputInfo.
       Input = Inputs.begin();

     addLTOOptions(ToolChain, Args, CmdArgs, Output, *Input,
                   D.getLTOMode() == LTOK_Thin);
   }

   if (Args.hasArg(options::OPT_shared) && !hasExportListLinkerOpts(CmdArgs)) {

     const char *CreateExportListExec = Args.MakeArgString(
         path::parent_path(ToolChain.getDriver().ClangExecutable) +
         "/llvm-nm");
     ArgStringList CreateExportCmdArgs;

     std::string CreateExportListPath =
         C.getDriver().GetTemporaryPath("CreateExportList", "exp");
     const char *ExportList =
         C.addTempFile(C.getArgs().MakeArgString(CreateExportListPath));

     for (const auto &II : Inputs)
       if (II.isFilename())
         CreateExportCmdArgs.push_back(II.getFilename());

     CreateExportCmdArgs.push_back("--export-symbols");
     CreateExportCmdArgs.push_back("-X");
     if (IsArch32Bit) {
       CreateExportCmdArgs.push_back("32");
     } else {
       // Must be 64-bit, otherwise asserted already.
       CreateExportCmdArgs.push_back("64");
     }

     auto ExpCommand = std::make_unique<Command>(
         JA, *this, ResponseFileSupport::None(), CreateExportListExec,
         CreateExportCmdArgs, Inputs, Output);
     ExpCommand->setRedirectFiles(
         {std::nullopt, std::string(ExportList), std::nullopt});
     C.addCommand(std::move(ExpCommand));
     CmdArgs.push_back(Args.MakeArgString(llvm::Twine("-bE:") + ExportList));
   }

   // Add directory to library search path.
   Args.AddAllArgs(CmdArgs, options::OPT_L);
   if (!Args.hasArg(options::OPT_r)) {
     ToolChain.AddFilePathLibArgs(Args, CmdArgs);
     ToolChain.addProfileRTLibs(Args, CmdArgs);

     if (getToolChain().ShouldLinkCXXStdlib(Args))
       getToolChain().AddCXXStdlibLibArgs(Args, CmdArgs);

     if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
       AddRunTimeLibs(ToolChain, D, CmdArgs, Args);

       // Add OpenMP runtime if -fopenmp is specified.
       if (Args.hasFlag(options::OPT_fopenmp, options::OPT_fopenmp_EQ,
                        options::OPT_fno_openmp, false)) {
         switch (ToolChain.getDriver().getOpenMPRuntime(Args)) {
         case Driver::OMPRT_OMP:
           CmdArgs.push_back("-lomp");
           break;
         case Driver::OMPRT_IOMP5:
           CmdArgs.push_back("-liomp5");
           break;
         case Driver::OMPRT_GOMP:
           CmdArgs.push_back("-lgomp");
           break;
         case Driver::OMPRT_Unknown:
           // Already diagnosed.
           break;
         }
       }

       // Support POSIX threads if "-pthreads" or "-pthread" is present.
       if (Args.hasArg(options::OPT_pthreads, options::OPT_pthread))
         CmdArgs.push_back("-lpthreads");

       if (D.CCCIsCXX())
         CmdArgs.push_back("-lm");

       CmdArgs.push_back("-lc");

       if (Args.hasArgNoClaim(options::OPT_p, options::OPT_pg)) {
         CmdArgs.push_back(Args.MakeArgString((llvm::Twine("-L") + D.SysRoot) +
                                              "/lib/profiled"));
         CmdArgs.push_back(Args.MakeArgString((llvm::Twine("-L") + D.SysRoot) +
                                              "/usr/lib/profiled"));
       }
     }
   }

   if (D.IsFlangMode()) {
     addFortranRuntimeLibraryPath(ToolChain, Args, CmdArgs);
     addFortranRuntimeLibs(ToolChain, Args, CmdArgs);
     CmdArgs.push_back("-lm");
     CmdArgs.push_back("-lpthread");
   }
   const char *Exec = Args.MakeArgString(ToolChain.GetLinkerPath());
   C.addCommand(std::make_unique<Command>(JA, *this, ResponseFileSupport::None(),
                                          Exec, CmdArgs, Inputs, Output));
 }

 /// AIX - AIX tool chain which can call as(1) and ld(1) directly.
 AIX::AIX(const Driver &D, const llvm::Triple &Triple, const ArgList &Args)
     : ToolChain(D, Triple, Args) {
   getProgramPaths().push_back(getDriver().Dir);

   ParseInlineAsmUsingAsmParser = Args.hasFlag(
       options::OPT_fintegrated_as, options::OPT_fno_integrated_as, true);
   getLibraryPaths().push_back(getDriver().SysRoot + "/usr/lib");
 }

 // Returns the effective header sysroot path to use.
 // This comes from either -isysroot or --sysroot.
 llvm::StringRef
 AIX::GetHeaderSysroot(const llvm::opt::ArgList &DriverArgs) const {
   if (DriverArgs.hasArg(options::OPT_isysroot))
     return DriverArgs.getLastArgValue(options::OPT_isysroot);
   if (!getDriver().SysRoot.empty())
     return getDriver().SysRoot;
   return "/";
 }

 void AIX::AddOpenMPIncludeArgs(const ArgList &DriverArgs,
                                ArgStringList &CC1Args) const {
   // Add OpenMP include paths if -fopenmp is specified.
   if (DriverArgs.hasFlag(options::OPT_fopenmp, options::OPT_fopenmp_EQ,
                          options::OPT_fno_openmp, false)) {
     SmallString<128> PathOpenMP;
     switch (getDriver().getOpenMPRuntime(DriverArgs)) {
     case Driver::OMPRT_OMP:
       PathOpenMP = GetHeaderSysroot(DriverArgs);
       llvm::sys::path::append(PathOpenMP, "opt/IBM/openxlCSDK", "include",
                               "openmp");
       addSystemInclude(DriverArgs, CC1Args, PathOpenMP.str());
       break;
     case Driver::OMPRT_IOMP5:
     case Driver::OMPRT_GOMP:
     case Driver::OMPRT_Unknown:
       // Unknown / unsupported include paths.
       break;
     }
   }
 }

 void AIX::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
                                     ArgStringList &CC1Args) const {
   // Return if -nostdinc is specified as a driver option.
   if (DriverArgs.hasArg(options::OPT_nostdinc))
     return;

   llvm::StringRef Sysroot = GetHeaderSysroot(DriverArgs);
   const Driver &D = getDriver();

   if (!DriverArgs.hasArg(options::OPT_nobuiltininc)) {
     SmallString<128> P(D.ResourceDir);
     // Add the PowerPC intrinsic headers (<resource>/include/ppc_wrappers)
     path::append(P, "include", "ppc_wrappers");
     addSystemInclude(DriverArgs, CC1Args, P);
     // Add the Clang builtin headers (<resource>/include)
     addSystemInclude(DriverArgs, CC1Args, path::parent_path(P.str()));
   }

   // Add the include directory containing omp.h. This needs to be before
   // adding the system include directory because other compilers put their
   // omp.h in /usr/include.
   AddOpenMPIncludeArgs(DriverArgs, CC1Args);

   // Return if -nostdlibinc is specified as a driver option.
   if (DriverArgs.hasArg(options::OPT_nostdlibinc))
     return;

   // Add <sysroot>/usr/include.
   SmallString<128> UP(Sysroot);
   path::append(UP, "/usr/include");
   addSystemInclude(DriverArgs, CC1Args, UP.str());
 }

 void AIX::AddClangCXXStdlibIncludeArgs(
     const llvm::opt::ArgList &DriverArgs,
     llvm::opt::ArgStringList &CC1Args) const {

   if (DriverArgs.hasArg(options::OPT_nostdinc) ||
       DriverArgs.hasArg(options::OPT_nostdincxx) ||
       DriverArgs.hasArg(options::OPT_nostdlibinc))
     return;

   switch (GetCXXStdlibType(DriverArgs)) {
   case ToolChain::CST_Libstdcxx:
     llvm::report_fatal_error(
         "picking up libstdc++ headers is unimplemented on AIX");
   case ToolChain::CST_Libcxx: {
     llvm::StringRef Sysroot = GetHeaderSysroot(DriverArgs);
     SmallString<128> PathCPP(Sysroot);
     llvm::sys::path::append(PathCPP, "opt/IBM/openxlCSDK", "include", "c++",
                             "v1");
     addSystemInclude(DriverArgs, CC1Args, PathCPP.str());
     // Required in order to suppress conflicting C++ overloads in the system
     // libc headers that were used by XL C++.
     CC1Args.push_back("-D__LIBC_NO_CPP_MATH_OVERLOADS__");
     return;
   }
   }

   llvm_unreachable("Unexpected C++ library type; only libc++ is supported.");
 }

 void AIX::AddCXXStdlibLibArgs(const llvm::opt::ArgList &Args,
                               llvm::opt::ArgStringList &CmdArgs) const {
   switch (GetCXXStdlibType(Args)) {
   case ToolChain::CST_Libstdcxx:
     llvm::report_fatal_error("linking libstdc++ unimplemented on AIX");
   case ToolChain::CST_Libcxx:
     CmdArgs.push_back("-lc++");
     if (Args.hasArg(options::OPT_fexperimental_library))
       CmdArgs.push_back("-lc++experimental");
     CmdArgs.push_back("-lc++abi");
     return;
   }

   llvm_unreachable("Unexpected C++ library type; only libc++ is supported.");
 }

 // This function processes all the mtocdata options to build the final
 // simplified toc data options to pass to CC1.
 static void addTocDataOptions(const llvm::opt::ArgList &Args,
                               llvm::opt::ArgStringList &CC1Args,
                               const Driver &D) {

   // Check the global toc-data setting. The default is -mno-tocdata.
   // To enable toc-data globally, -mtocdata must be specified.
   // Additionally, it must be last to take effect.
   const bool TOCDataGloballyinEffect = [&Args]() {
     if (const Arg *LastArg =
             Args.getLastArg(options::OPT_mtocdata, options::OPT_mno_tocdata))
       return LastArg->getOption().matches(options::OPT_mtocdata);
     else
       return false;
   }();

   // Currently only supported for small code model.
   if (TOCDataGloballyinEffect &&
       (Args.getLastArgValue(options::OPT_mcmodel_EQ).equals("large") ||
        Args.getLastArgValue(options::OPT_mcmodel_EQ).equals("medium"))) {
     D.Diag(clang::diag::warn_drv_unsupported_tocdata);
     return;
   }

   enum TOCDataSetting {
     AddressInTOC = 0, // Address of the symbol stored in the TOC.
     DataInTOC = 1     // Symbol defined in the TOC.
   };

   const TOCDataSetting DefaultTocDataSetting =
       TOCDataGloballyinEffect ? DataInTOC : AddressInTOC;

   // Process the list of variables in the explicitly specified options
   // -mtocdata= and -mno-tocdata= to see which variables are opposite to
   // the global setting of tocdata in TOCDataGloballyinEffect.
   // Those that have the opposite setting to TOCDataGloballyinEffect, are added
   // to ExplicitlySpecifiedGlobals.
   std::set<llvm::StringRef> ExplicitlySpecifiedGlobals;
   for (const auto Arg :
        Args.filtered(options::OPT_mtocdata_EQ, options::OPT_mno_tocdata_EQ)) {
     TOCDataSetting ArgTocDataSetting =
         Arg->getOption().matches(options::OPT_mtocdata_EQ) ? DataInTOC
                                                            : AddressInTOC;

     if (ArgTocDataSetting != DefaultTocDataSetting)
       for (const char *Val : Arg->getValues())
         ExplicitlySpecifiedGlobals.insert(Val);
     else
       for (const char *Val : Arg->getValues())
         ExplicitlySpecifiedGlobals.erase(Val);
   }

   auto buildExceptionList = [](const std::set<llvm::StringRef> &ExplicitValues,
                                const char *OptionSpelling) {
     std::string Option(OptionSpelling);
     bool IsFirst = true;
     for (const auto &E : ExplicitValues) {
       if (!IsFirst)
         Option += ",";

       IsFirst = false;
       Option += E.str();
     }
     return Option;
   };

   // Pass the final tocdata options to CC1 consisting of the default
   // tocdata option (-mtocdata/-mno-tocdata) along with the list
   // option (-mno-tocdata=/-mtocdata=) if there are any explicitly specified
   // variables which would be exceptions to the default setting.
   const char *TocDataGlobalOption =
       TOCDataGloballyinEffect ? "-mtocdata" : "-mno-tocdata";
   CC1Args.push_back(TocDataGlobalOption);

   const char *TocDataListOption =
       TOCDataGloballyinEffect ? "-mno-tocdata=" : "-mtocdata=";
   if (!ExplicitlySpecifiedGlobals.empty())
     CC1Args.push_back(Args.MakeArgString(llvm::Twine(
         buildExceptionList(ExplicitlySpecifiedGlobals, TocDataListOption))));
 }

 void AIX::addClangTargetOptions(
     const llvm::opt::ArgList &Args, llvm::opt::ArgStringList &CC1Args,
     Action::OffloadKind DeviceOffloadingKind) const {
   Args.AddLastArg(CC1Args, options::OPT_mignore_xcoff_visibility);
   Args.AddLastArg(CC1Args, options::OPT_mdefault_visibility_export_mapping_EQ);
   Args.addOptInFlag(CC1Args, options::OPT_mxcoff_roptr, options::OPT_mno_xcoff_roptr);

   // Forward last mtocdata/mno_tocdata options to -cc1.
   if (Args.hasArg(options::OPT_mtocdata_EQ, options::OPT_mno_tocdata_EQ,
                   options::OPT_mtocdata))
     addTocDataOptions(Args, CC1Args, getDriver());

   if (Args.hasFlag(options::OPT_fxl_pragma_pack,
                    options::OPT_fno_xl_pragma_pack, true))
     CC1Args.push_back("-fxl-pragma-pack");
 }

 void AIX::addProfileRTLibs(const llvm::opt::ArgList &Args,
                            llvm::opt::ArgStringList &CmdArgs) const {
   if (needsProfileRT(Args)) {
     // Add linker option -u__llvm_profile_runtime to cause runtime
     // initialization to occur.
     CmdArgs.push_back(Args.MakeArgString(
         Twine("-u", llvm::getInstrProfRuntimeHookVarName())));

     if (const auto *A =
             Args.getLastArgNoClaim(options::OPT_fprofile_update_EQ)) {
       StringRef Val = A->getValue();
       if (Val == "atomic" || Val == "prefer-atomic")
         CmdArgs.push_back("-latomic");
     }
   }

   ToolChain::addProfileRTLibs(Args, CmdArgs);
 }

 ToolChain::CXXStdlibType AIX::GetDefaultCXXStdlibType() const {
   return ToolChain::CST_Libcxx;
 }

 ToolChain::RuntimeLibType AIX::GetDefaultRuntimeLibType() const {
   return ToolChain::RLT_CompilerRT;
 }

 auto AIX::buildAssembler() const -> Tool * { return new aix::Assembler(*this); }

 auto AIX::buildLinker() const -> Tool * { return new aix::Linker(*this); }
	//===--- AIX.cpp - AIX ToolChain Implementations ----------------- C++ --===//
	//
	// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
	// See https://llvm.org/LICENSE.txt for license information.
	// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
	//
	//===----------------------------------------------------------------------===//

	#include "AIX.h"
	#include "Arch/PPC.h"
	#include "CommonArgs.h"
	#include "clang/Driver/Compilation.h"
	#include "clang/Driver/Options.h"
	#include "clang/Driver/SanitizerArgs.h"
	#include "llvm/ADT/StringExtras.h"
	#include "llvm/Option/ArgList.h"
	#include "llvm/ProfileData/InstrProf.h"
	#include "llvm/Support/Path.h"

	#include <set>

	using AIX = clang::driver::toolchains::AIX;
	using namespace clang::driver;
	using namespace clang::driver::tools;
	using namespace clang::driver::toolchains;

	using namespace llvm::opt;
	using namespace llvm::sys;

	void aix::Assembler::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;

	const bool IsArch32Bit = getToolChain().getTriple().isArch32Bit();
	const bool IsArch64Bit = getToolChain().getTriple().isArch64Bit();
	// Only support 32 and 64 bit.
	if (!IsArch32Bit && !IsArch64Bit)
	llvm_unreachable("Unsupported bit width value.");

	if (Arg *A = C.getArgs().getLastArg(options::OPT_G)) {
	D.Diag(diag::err_drv_unsupported_opt_for_target)
	<< A->getSpelling() << D.getTargetTriple();
	}

	// Specify the mode in which the as(1) command operates.
	if (IsArch32Bit) {
	CmdArgs.push_back("-a32");
	} else {
	// Must be 64-bit, otherwise asserted already.
	CmdArgs.push_back("-a64");
	}

	// Accept any mixture of instructions.
	// On Power for AIX and Linux, this behaviour matches that of GCC for both the
	// user-provided assembler source case and the compiler-produced assembler
	// source case. Yet XL with user-provided assembler source would not add this.
	CmdArgs.push_back("-many");

	Args.AddAllArgValues(CmdArgs, options::OPT_Wa_COMMA, options::OPT_Xassembler);

	// Specify assembler output file.
	assert((Output.isFilename() \|\| Output.isNothing()) && "Invalid output.");
	if (Output.isFilename()) {
	CmdArgs.push_back("-o");
	CmdArgs.push_back(Output.getFilename());
	}

	// Specify assembler input file.
	// The system assembler on AIX takes exactly one input file. The driver is
	// expected to invoke as(1) separately for each assembler source input file.
	if (Inputs.size() != 1)
	llvm_unreachable("Invalid number of input files.");
	const InputInfo &II = Inputs[0];
	assert((II.isFilename() \|\| II.isNothing()) && "Invalid input.");
	if (II.isFilename())
	CmdArgs.push_back(II.getFilename());

	const char *Exec = Args.MakeArgString(getToolChain().GetProgramPath("as"));
	C.addCommand(std::make_unique<Command>(JA, *this, ResponseFileSupport::None(),
	Exec, CmdArgs, Inputs, Output));
	}

	// Determine whether there are any linker options that supply an export list
	// (or equivalent information about what to export) being sent to the linker.
	static bool hasExportListLinkerOpts(const ArgStringList &CmdArgs) {
	for (size_t i = 0, Size = CmdArgs.size(); i < Size; ++i) {
	llvm::StringRef ArgString(CmdArgs[i]);

	if (ArgString.starts_with("-bE:") \|\| ArgString.starts_with("-bexport:") \|\|
	ArgString == "-bexpall" \|\| ArgString == "-bexpfull")
	return true;

	// If we split -b option, check the next opt.
	if (ArgString == "-b" && i + 1 < Size) {
	++i;
	llvm::StringRef ArgNextString(CmdArgs[i]);
	if (ArgNextString.starts_with("E:") \|\|
	ArgNextString.starts_with("export:") \|\| ArgNextString == "expall" \|\|
	ArgNextString == "expfull")
	return true;
	}
	}
	return false;
	}

	void aix::Linker::ConstructJob(Compilation &C, const JobAction &JA,
	const InputInfo &Output,
	const InputInfoList &Inputs, const ArgList &Args,
	const char *LinkingOutput) const {
	const AIX &ToolChain = static_cast<const AIX &>(getToolChain());
	const Driver &D = ToolChain.getDriver();
	ArgStringList CmdArgs;

	const bool IsArch32Bit = ToolChain.getTriple().isArch32Bit();
	const bool IsArch64Bit = ToolChain.getTriple().isArch64Bit();
	// Only support 32 and 64 bit.
	if (!(IsArch32Bit \|\| IsArch64Bit))
	llvm_unreachable("Unsupported bit width value.");

	if (Arg *A = C.getArgs().getLastArg(options::OPT_G)) {
	D.Diag(diag::err_drv_unsupported_opt_for_target)
	<< A->getSpelling() << D.getTargetTriple();
	}

	// Force static linking when "-static" is present.
	if (Args.hasArg(options::OPT_static))
	CmdArgs.push_back("-bnso");

	// Add options for shared libraries.
	if (Args.hasArg(options::OPT_shared)) {
	CmdArgs.push_back("-bM:SRE");
	CmdArgs.push_back("-bnoentry");
	}

	if (Args.hasFlag(options::OPT_mxcoff_roptr, options::OPT_mno_xcoff_roptr,
	false)) {
	if (Args.hasArg(options::OPT_shared))
	D.Diag(diag::err_roptr_cannot_build_shared);

	// The `-mxcoff-roptr` option places constants in RO sections as much as
	// possible. Then `-bforceimprw` changes such sections to RW if they contain
	// imported symbols that need to be resolved.
	CmdArgs.push_back("-bforceimprw");
	}

	// PGO instrumentation generates symbols belonging to special sections, and
	// the linker needs to place all symbols in a particular section together in
	// memory; the AIX linker does that under an option.
	if (Args.hasFlag(options::OPT_fprofile_arcs, options::OPT_fno_profile_arcs,
	false) \|\|
	Args.hasFlag(options::OPT_fprofile_generate,
	options::OPT_fno_profile_generate, false) \|\|
	Args.hasFlag(options::OPT_fprofile_generate_EQ,
	options::OPT_fno_profile_generate, false) \|\|
	Args.hasFlag(options::OPT_fprofile_instr_generate,
	options::OPT_fno_profile_instr_generate, false) \|\|
	Args.hasFlag(options::OPT_fprofile_instr_generate_EQ,
	options::OPT_fno_profile_instr_generate, false) \|\|
	Args.hasFlag(options::OPT_fcs_profile_generate,
	options::OPT_fno_profile_generate, false) \|\|
	Args.hasFlag(options::OPT_fcs_profile_generate_EQ,
	options::OPT_fno_profile_generate, false) \|\|
	Args.hasArg(options::OPT_fcreate_profile) \|\|
	Args.hasArg(options::OPT_coverage))
	CmdArgs.push_back("-bdbg:namedsects:ss");

	if (Arg *A =
	Args.getLastArg(clang::driver::options::OPT_mxcoff_build_id_EQ)) {
	StringRef BuildId = A->getValue();
	if (BuildId[0] != '0' \|\| BuildId[1] != 'x' \|\|
	BuildId.find_if_not(llvm::isHexDigit, 2) != StringRef::npos)
	ToolChain.getDriver().Diag(diag::err_drv_unsupported_option_argument)
	<< A->getSpelling() << BuildId;
	else {
	std::string LinkerFlag = "-bdbg:ldrinfo:xcoff_binary_id:0x";
	if (BuildId.size() % 2) // Prepend a 0 if odd number of digits.
	LinkerFlag += "0";
	LinkerFlag += BuildId.drop_front(2).lower();
	CmdArgs.push_back(Args.MakeArgString(LinkerFlag));
	}
	}

	// Specify linker output file.
	assert((Output.isFilename() \|\| Output.isNothing()) && "Invalid output.");
	if (Output.isFilename()) {
	CmdArgs.push_back("-o");
	CmdArgs.push_back(Output.getFilename());
	}

	// Set linking mode (i.e., 32/64-bit) and the address of
	// text and data sections based on arch bit width.
	if (IsArch32Bit) {
	CmdArgs.push_back("-b32");
	CmdArgs.push_back("-bpT:0x10000000");
	CmdArgs.push_back("-bpD:0x20000000");
	} else {
	// Must be 64-bit, otherwise asserted already.
	CmdArgs.push_back("-b64");
	CmdArgs.push_back("-bpT:0x100000000");
	CmdArgs.push_back("-bpD:0x110000000");
	}

	if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles,
	options::OPT_shared, options::OPT_r)) {
	auto getCrt0Basename = [&Args, IsArch32Bit] {
	if (Arg *A = Args.getLastArgNoClaim(options::OPT_p, options::OPT_pg)) {
	// Enable gprofiling when "-pg" is specified.
	if (A->getOption().matches(options::OPT_pg))
	return IsArch32Bit ? "gcrt0.o" : "gcrt0_64.o";
	// Enable profiling when "-p" is specified.
	return IsArch32Bit ? "mcrt0.o" : "mcrt0_64.o";
	}
	return IsArch32Bit ? "crt0.o" : "crt0_64.o";
	};

	CmdArgs.push_back(
	Args.MakeArgString(ToolChain.GetFilePath(getCrt0Basename())));

	CmdArgs.push_back(Args.MakeArgString(
	ToolChain.GetFilePath(IsArch32Bit ? "crti.o" : "crti_64.o")));
	}

	// Collect all static constructor and destructor functions in both C and CXX
	// language link invocations. This has to come before AddLinkerInputs as the
	// implied option needs to precede any other '-bcdtors' settings or
	// '-bnocdtors' that '-Wl' might forward.
	CmdArgs.push_back("-bcdtors:all:0:s");

	// Specify linker input file(s).
	AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);

	if (D.isUsingLTO()) {
	assert(!Inputs.empty() && "Must have at least one input.");
	// Find the first filename InputInfo object.
	auto Input = llvm::find_if(
	Inputs, [](const InputInfo &II) -> bool { return II.isFilename(); });
	if (Input == Inputs.end())
	// For a very rare case, all of the inputs to the linker are
	// InputArg. If that happens, just use the first InputInfo.
	Input = Inputs.begin();

	addLTOOptions(ToolChain, Args, CmdArgs, Output, *Input,
	D.getLTOMode() == LTOK_Thin);
	}

	if (Args.hasArg(options::OPT_shared) && !hasExportListLinkerOpts(CmdArgs)) {

	const char *CreateExportListExec = Args.MakeArgString(
	path::parent_path(ToolChain.getDriver().ClangExecutable) +
	"/llvm-nm");
	ArgStringList CreateExportCmdArgs;

	std::string CreateExportListPath =
	C.getDriver().GetTemporaryPath("CreateExportList", "exp");
	const char *ExportList =
	C.addTempFile(C.getArgs().MakeArgString(CreateExportListPath));

	for (const auto &II : Inputs)
	if (II.isFilename())
	CreateExportCmdArgs.push_back(II.getFilename());

	CreateExportCmdArgs.push_back("--export-symbols");
	CreateExportCmdArgs.push_back("-X");
	if (IsArch32Bit) {
	CreateExportCmdArgs.push_back("32");
	} else {
	// Must be 64-bit, otherwise asserted already.
	CreateExportCmdArgs.push_back("64");
	}

	auto ExpCommand = std::make_unique<Command>(
	JA, *this, ResponseFileSupport::None(), CreateExportListExec,
	CreateExportCmdArgs, Inputs, Output);
	ExpCommand->setRedirectFiles(
	{std::nullopt, std::string(ExportList), std::nullopt});
	C.addCommand(std::move(ExpCommand));
	CmdArgs.push_back(Args.MakeArgString(llvm::Twine("-bE:") + ExportList));
	}

	// Add directory to library search path.
	Args.AddAllArgs(CmdArgs, options::OPT_L);
	if (!Args.hasArg(options::OPT_r)) {
	ToolChain.AddFilePathLibArgs(Args, CmdArgs);
	ToolChain.addProfileRTLibs(Args, CmdArgs);

	if (getToolChain().ShouldLinkCXXStdlib(Args))
	getToolChain().AddCXXStdlibLibArgs(Args, CmdArgs);

	if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
	AddRunTimeLibs(ToolChain, D, CmdArgs, Args);

	// Add OpenMP runtime if -fopenmp is specified.
	if (Args.hasFlag(options::OPT_fopenmp, options::OPT_fopenmp_EQ,
	options::OPT_fno_openmp, false)) {
	switch (ToolChain.getDriver().getOpenMPRuntime(Args)) {
	case Driver::OMPRT_OMP:
	CmdArgs.push_back("-lomp");
	break;
	case Driver::OMPRT_IOMP5:
	CmdArgs.push_back("-liomp5");
	break;
	case Driver::OMPRT_GOMP:
	CmdArgs.push_back("-lgomp");
	break;
	case Driver::OMPRT_Unknown:
	// Already diagnosed.
	break;
	}
	}

	// Support POSIX threads if "-pthreads" or "-pthread" is present.
	if (Args.hasArg(options::OPT_pthreads, options::OPT_pthread))
	CmdArgs.push_back("-lpthreads");

	if (D.CCCIsCXX())
	CmdArgs.push_back("-lm");

	CmdArgs.push_back("-lc");

	if (Args.hasArgNoClaim(options::OPT_p, options::OPT_pg)) {
	CmdArgs.push_back(Args.MakeArgString((llvm::Twine("-L") + D.SysRoot) +
	"/lib/profiled"));
	CmdArgs.push_back(Args.MakeArgString((llvm::Twine("-L") + D.SysRoot) +
	"/usr/lib/profiled"));
	}
	}
	}

	if (D.IsFlangMode()) {
	addFortranRuntimeLibraryPath(ToolChain, Args, CmdArgs);
	addFortranRuntimeLibs(ToolChain, Args, CmdArgs);
	CmdArgs.push_back("-lm");
	CmdArgs.push_back("-lpthread");
	}
	const char *Exec = Args.MakeArgString(ToolChain.GetLinkerPath());
	C.addCommand(std::make_unique<Command>(JA, *this, ResponseFileSupport::None(),
	Exec, CmdArgs, Inputs, Output));
	}

	/// AIX - AIX tool chain which can call as(1) and ld(1) directly.
	AIX::AIX(const Driver &D, const llvm::Triple &Triple, const ArgList &Args)
	: ToolChain(D, Triple, Args) {
	getProgramPaths().push_back(getDriver().Dir);

	ParseInlineAsmUsingAsmParser = Args.hasFlag(
	options::OPT_fintegrated_as, options::OPT_fno_integrated_as, true);
	getLibraryPaths().push_back(getDriver().SysRoot + "/usr/lib");
	}

	// Returns the effective header sysroot path to use.
	// This comes from either -isysroot or --sysroot.
	llvm::StringRef
	AIX::GetHeaderSysroot(const llvm::opt::ArgList &DriverArgs) const {
	if (DriverArgs.hasArg(options::OPT_isysroot))
	return DriverArgs.getLastArgValue(options::OPT_isysroot);
	if (!getDriver().SysRoot.empty())
	return getDriver().SysRoot;
	return "/";
	}

	void AIX::AddOpenMPIncludeArgs(const ArgList &DriverArgs,
	ArgStringList &CC1Args) const {
	// Add OpenMP include paths if -fopenmp is specified.
	if (DriverArgs.hasFlag(options::OPT_fopenmp, options::OPT_fopenmp_EQ,
	options::OPT_fno_openmp, false)) {
	SmallString<128> PathOpenMP;
	switch (getDriver().getOpenMPRuntime(DriverArgs)) {
	case Driver::OMPRT_OMP:
	PathOpenMP = GetHeaderSysroot(DriverArgs);
	llvm::sys::path::append(PathOpenMP, "opt/IBM/openxlCSDK", "include",
	"openmp");
	addSystemInclude(DriverArgs, CC1Args, PathOpenMP.str());
	break;
	case Driver::OMPRT_IOMP5:
	case Driver::OMPRT_GOMP:
	case Driver::OMPRT_Unknown:
	// Unknown / unsupported include paths.
	break;
	}
	}
	}

	void AIX::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
	ArgStringList &CC1Args) const {
	// Return if -nostdinc is specified as a driver option.
	if (DriverArgs.hasArg(options::OPT_nostdinc))
	return;

	llvm::StringRef Sysroot = GetHeaderSysroot(DriverArgs);
	const Driver &D = getDriver();

	if (!DriverArgs.hasArg(options::OPT_nobuiltininc)) {
	SmallString<128> P(D.ResourceDir);
	// Add the PowerPC intrinsic headers (<resource>/include/ppc_wrappers)
	path::append(P, "include", "ppc_wrappers");
	addSystemInclude(DriverArgs, CC1Args, P);
	// Add the Clang builtin headers (<resource>/include)
	addSystemInclude(DriverArgs, CC1Args, path::parent_path(P.str()));
	}

	// Add the include directory containing omp.h. This needs to be before
	// adding the system include directory because other compilers put their
	// omp.h in /usr/include.
	AddOpenMPIncludeArgs(DriverArgs, CC1Args);

	// Return if -nostdlibinc is specified as a driver option.
	if (DriverArgs.hasArg(options::OPT_nostdlibinc))
	return;

	// Add <sysroot>/usr/include.
	SmallString<128> UP(Sysroot);
	path::append(UP, "/usr/include");
	addSystemInclude(DriverArgs, CC1Args, UP.str());
	}

	void AIX::AddClangCXXStdlibIncludeArgs(
	const llvm::opt::ArgList &DriverArgs,
	llvm::opt::ArgStringList &CC1Args) const {

	if (DriverArgs.hasArg(options::OPT_nostdinc) \|\|
	DriverArgs.hasArg(options::OPT_nostdincxx) \|\|
	DriverArgs.hasArg(options::OPT_nostdlibinc))
	return;

	switch (GetCXXStdlibType(DriverArgs)) {
	case ToolChain::CST_Libstdcxx:
	llvm::report_fatal_error(
	"picking up libstdc++ headers is unimplemented on AIX");
	case ToolChain::CST_Libcxx: {
	llvm::StringRef Sysroot = GetHeaderSysroot(DriverArgs);
	SmallString<128> PathCPP(Sysroot);
	llvm::sys::path::append(PathCPP, "opt/IBM/openxlCSDK", "include", "c++",
	"v1");
	addSystemInclude(DriverArgs, CC1Args, PathCPP.str());
	// Required in order to suppress conflicting C++ overloads in the system
	// libc headers that were used by XL C++.
	CC1Args.push_back("-D__LIBC_NO_CPP_MATH_OVERLOADS__");
	return;
	}
	}

	llvm_unreachable("Unexpected C++ library type; only libc++ is supported.");
	}

	void AIX::AddCXXStdlibLibArgs(const llvm::opt::ArgList &Args,
	llvm::opt::ArgStringList &CmdArgs) const {
	switch (GetCXXStdlibType(Args)) {
	case ToolChain::CST_Libstdcxx:
	llvm::report_fatal_error("linking libstdc++ unimplemented on AIX");
	case ToolChain::CST_Libcxx:
	CmdArgs.push_back("-lc++");
	if (Args.hasArg(options::OPT_fexperimental_library))
	CmdArgs.push_back("-lc++experimental");
	CmdArgs.push_back("-lc++abi");
	return;
	}

	llvm_unreachable("Unexpected C++ library type; only libc++ is supported.");
	}

	// This function processes all the mtocdata options to build the final
	// simplified toc data options to pass to CC1.
	static void addTocDataOptions(const llvm::opt::ArgList &Args,
	llvm::opt::ArgStringList &CC1Args,
	const Driver &D) {

	// Check the global toc-data setting. The default is -mno-tocdata.
	// To enable toc-data globally, -mtocdata must be specified.
	// Additionally, it must be last to take effect.
	const bool TOCDataGloballyinEffect = [&Args]() {
	if (const Arg *LastArg =
	Args.getLastArg(options::OPT_mtocdata, options::OPT_mno_tocdata))
	return LastArg->getOption().matches(options::OPT_mtocdata);
	else
	return false;
	}();

	// Currently only supported for small code model.
	if (TOCDataGloballyinEffect &&
	(Args.getLastArgValue(options::OPT_mcmodel_EQ).equals("large") \|\|
	Args.getLastArgValue(options::OPT_mcmodel_EQ).equals("medium"))) {
	D.Diag(clang::diag::warn_drv_unsupported_tocdata);
	return;
	}

	enum TOCDataSetting {
	AddressInTOC = 0, // Address of the symbol stored in the TOC.
	DataInTOC = 1 // Symbol defined in the TOC.
	};

	const TOCDataSetting DefaultTocDataSetting =
	TOCDataGloballyinEffect ? DataInTOC : AddressInTOC;

	// Process the list of variables in the explicitly specified options
	// -mtocdata= and -mno-tocdata= to see which variables are opposite to
	// the global setting of tocdata in TOCDataGloballyinEffect.
	// Those that have the opposite setting to TOCDataGloballyinEffect, are added
	// to ExplicitlySpecifiedGlobals.
	std::set<llvm::StringRef> ExplicitlySpecifiedGlobals;
	for (const auto Arg :
	Args.filtered(options::OPT_mtocdata_EQ, options::OPT_mno_tocdata_EQ)) {
	TOCDataSetting ArgTocDataSetting =
	Arg->getOption().matches(options::OPT_mtocdata_EQ) ? DataInTOC
	: AddressInTOC;

	if (ArgTocDataSetting != DefaultTocDataSetting)
	for (const char *Val : Arg->getValues())
	ExplicitlySpecifiedGlobals.insert(Val);
	else
	for (const char *Val : Arg->getValues())
	ExplicitlySpecifiedGlobals.erase(Val);
	}

	auto buildExceptionList = [](const std::set<llvm::StringRef> &ExplicitValues,
	const char *OptionSpelling) {
	std::string Option(OptionSpelling);
	bool IsFirst = true;
	for (const auto &E : ExplicitValues) {
	if (!IsFirst)
	Option += ",";

	IsFirst = false;
	Option += E.str();
	}
	return Option;
	};

	// Pass the final tocdata options to CC1 consisting of the default
	// tocdata option (-mtocdata/-mno-tocdata) along with the list
	// option (-mno-tocdata=/-mtocdata=) if there are any explicitly specified
	// variables which would be exceptions to the default setting.
	const char *TocDataGlobalOption =
	TOCDataGloballyinEffect ? "-mtocdata" : "-mno-tocdata";
	CC1Args.push_back(TocDataGlobalOption);

	const char *TocDataListOption =
	TOCDataGloballyinEffect ? "-mno-tocdata=" : "-mtocdata=";
	if (!ExplicitlySpecifiedGlobals.empty())
	CC1Args.push_back(Args.MakeArgString(llvm::Twine(
	buildExceptionList(ExplicitlySpecifiedGlobals, TocDataListOption))));
	}

	void AIX::addClangTargetOptions(
	const llvm::opt::ArgList &Args, llvm::opt::ArgStringList &CC1Args,
	Action::OffloadKind DeviceOffloadingKind) const {
	Args.AddLastArg(CC1Args, options::OPT_mignore_xcoff_visibility);
	Args.AddLastArg(CC1Args, options::OPT_mdefault_visibility_export_mapping_EQ);
	Args.addOptInFlag(CC1Args, options::OPT_mxcoff_roptr, options::OPT_mno_xcoff_roptr);

	// Forward last mtocdata/mno_tocdata options to -cc1.
	if (Args.hasArg(options::OPT_mtocdata_EQ, options::OPT_mno_tocdata_EQ,
	options::OPT_mtocdata))
	addTocDataOptions(Args, CC1Args, getDriver());

	if (Args.hasFlag(options::OPT_fxl_pragma_pack,
	options::OPT_fno_xl_pragma_pack, true))
	CC1Args.push_back("-fxl-pragma-pack");
	}

	void AIX::addProfileRTLibs(const llvm::opt::ArgList &Args,
	llvm::opt::ArgStringList &CmdArgs) const {
	if (needsProfileRT(Args)) {
	// Add linker option -u__llvm_profile_runtime to cause runtime
	// initialization to occur.
	CmdArgs.push_back(Args.MakeArgString(
	Twine("-u", llvm::getInstrProfRuntimeHookVarName())));

	if (const auto *A =
	Args.getLastArgNoClaim(options::OPT_fprofile_update_EQ)) {
	StringRef Val = A->getValue();
	if (Val == "atomic" \|\| Val == "prefer-atomic")
	CmdArgs.push_back("-latomic");
	}
	}

	ToolChain::addProfileRTLibs(Args, CmdArgs);
	}

	ToolChain::CXXStdlibType AIX::GetDefaultCXXStdlibType() const {
	return ToolChain::CST_Libcxx;
	}

	ToolChain::RuntimeLibType AIX::GetDefaultRuntimeLibType() const {
	return ToolChain::RLT_CompilerRT;
	}

	auto AIX::buildAssembler() const -> Tool * { return new aix::Assembler(*this); }

	auto AIX::buildLinker() const -> Tool * { return new aix::Linker(*this); }