clang/lib/Driver/ToolChains/AIX.cpp

   1 //===--- AIX.cpp - AIX ToolChain Implementations ----------------*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "AIX.h"
  10 #include "Arch/PPC.h"
  11 #include "CommonArgs.h"
  12 #include "clang/Driver/Compilation.h"
  13 #include "clang/Driver/Options.h"
  14 #include "clang/Driver/SanitizerArgs.h"
  15 #include "llvm/ADT/StringExtras.h"
  16 #include "llvm/Option/ArgList.h"
  17 #include "llvm/ProfileData/InstrProf.h"
  18 #include "llvm/Support/Path.h"
  19
  20 #include <set>
  21
  22 using AIX = clang::driver::toolchains::AIX;
  23 using namespace clang::driver;
  24 using namespace clang::driver::tools;
  25 using namespace clang::driver::toolchains;
  26
  27 using namespace llvm::opt;
  28 using namespace llvm::sys;
  29
  30 void aix::Assembler::ConstructJob(Compilation &C, const JobAction &JA,
  31                                   const InputInfo &Output,
  32                                   const InputInfoList &Inputs,
  33                                   const ArgList &Args,
  34                                   const char *LinkingOutput) const {
  35   const Driver &D = getToolChain().getDriver();
  36   ArgStringList CmdArgs;
  37
  38   const bool IsArch32Bit = getToolChain().getTriple().isArch32Bit();
  39   const bool IsArch64Bit = getToolChain().getTriple().isArch64Bit();
  40   // Only support 32 and 64 bit.
  41   if (!IsArch32Bit && !IsArch64Bit)
  42     llvm_unreachable("Unsupported bit width value.");
  43
  44   if (Arg *A = C.getArgs().getLastArg(options::OPT_G)) {
  45     D.Diag(diag::err_drv_unsupported_opt_for_target)
  46         << A->getSpelling() << D.getTargetTriple();
  47   }
  48
  49   // Specify the mode in which the as(1) command operates.
  50   if (IsArch32Bit) {
  51     CmdArgs.push_back("-a32");
  52   } else {
  53     // Must be 64-bit, otherwise asserted already.
  54     CmdArgs.push_back("-a64");
  55   }
  56
  57   // Accept any mixture of instructions.
  58   // On Power for AIX and Linux, this behaviour matches that of GCC for both the
  59   // user-provided assembler source case and the compiler-produced assembler
  60   // source case. Yet XL with user-provided assembler source would not add this.
  61   CmdArgs.push_back("-many");
  62
  63   Args.AddAllArgValues(CmdArgs, options::OPT_Wa_COMMA, options::OPT_Xassembler);
  64
  65   // Specify assembler output file.
  66   assert((Output.isFilename() || Output.isNothing()) && "Invalid output.");
  67   if (Output.isFilename()) {
  68     CmdArgs.push_back("-o");
  69     CmdArgs.push_back(Output.getFilename());
  70   }
  71
  72   // Specify assembler input file.
  73   // The system assembler on AIX takes exactly one input file. The driver is
  74   // expected to invoke as(1) separately for each assembler source input file.
  75   if (Inputs.size() != 1)
  76     llvm_unreachable("Invalid number of input files.");
  77   const InputInfo &II = Inputs[0];
  78   assert((II.isFilename() || II.isNothing()) && "Invalid input.");
  79   if (II.isFilename())
  80     CmdArgs.push_back(II.getFilename());
  81
  82   const char *Exec = Args.MakeArgString(getToolChain().GetProgramPath("as"));
  83   C.addCommand(std::make_unique<Command>(JA, *this, ResponseFileSupport::None(),
  84                                          Exec, CmdArgs, Inputs, Output));
  85 }
  86
  87 // Determine whether there are any linker options that supply an export list
  88 // (or equivalent information about what to export) being sent to the linker.
  89 static bool hasExportListLinkerOpts(const ArgStringList &CmdArgs) {
  90   for (size_t i = 0, Size = CmdArgs.size(); i < Size; ++i) {
  91     llvm::StringRef ArgString(CmdArgs[i]);
  92
  93     if (ArgString.starts_with("-bE:") || ArgString.starts_with("-bexport:") ||
  94         ArgString == "-bexpall" || ArgString == "-bexpfull")
  95       return true;
  96
  97     // If we split -b option, check the next opt.
  98     if (ArgString == "-b" && i + 1 < Size) {
  99       ++i;
 100       llvm::StringRef ArgNextString(CmdArgs[i]);
 101       if (ArgNextString.starts_with("E:") ||
 102           ArgNextString.starts_with("export:") || ArgNextString == "expall" ||
 103           ArgNextString == "expfull")
 104         return true;
 105     }
 106   }
 107   return false;
 108 }
 109
 110 void aix::Linker::ConstructJob(Compilation &C, const JobAction &JA,
 111                                const InputInfo &Output,
 112                                const InputInfoList &Inputs, const ArgList &Args,
 113                                const char *LinkingOutput) const {
 114   const AIX &ToolChain = static_cast<const AIX &>(getToolChain());
 115   const Driver &D = ToolChain.getDriver();
 116   ArgStringList CmdArgs;
 117
 118   const bool IsArch32Bit = ToolChain.getTriple().isArch32Bit();
 119   const bool IsArch64Bit = ToolChain.getTriple().isArch64Bit();
 120   // Only support 32 and 64 bit.
 121   if (!(IsArch32Bit || IsArch64Bit))
 122     llvm_unreachable("Unsupported bit width value.");
 123
 124   if (Arg *A = C.getArgs().getLastArg(options::OPT_G)) {
 125     D.Diag(diag::err_drv_unsupported_opt_for_target)
 126         << A->getSpelling() << D.getTargetTriple();
 127   }
 128
 129   // Force static linking when "-static" is present.
 130   if (Args.hasArg(options::OPT_static))
 131     CmdArgs.push_back("-bnso");
 132
 133   // Add options for shared libraries.
 134   if (Args.hasArg(options::OPT_shared)) {
 135     CmdArgs.push_back("-bM:SRE");
 136     CmdArgs.push_back("-bnoentry");
 137   }
 138
 139   if (Args.hasFlag(options::OPT_mxcoff_roptr, options::OPT_mno_xcoff_roptr,
 140                    false)) {
 141     if (Args.hasArg(options::OPT_shared))
 142       D.Diag(diag::err_roptr_cannot_build_shared);
 143
 144     // The `-mxcoff-roptr` option places constants in RO sections as much as
 145     // possible. Then `-bforceimprw` changes such sections to RW if they contain
 146     // imported symbols that need to be resolved.
 147     CmdArgs.push_back("-bforceimprw");
 148   }
 149
 150   // PGO instrumentation generates symbols belonging to special sections, and
 151   // the linker needs to place all symbols in a particular section together in
 152   // memory; the AIX linker does that under an option.
 153   if (Args.hasFlag(options::OPT_fprofile_arcs, options::OPT_fno_profile_arcs,
 154                     false) ||
 155        Args.hasFlag(options::OPT_fprofile_generate,
 156                     options::OPT_fno_profile_generate, false) ||
 157        Args.hasFlag(options::OPT_fprofile_generate_EQ,
 158                     options::OPT_fno_profile_generate, false) ||
 159        Args.hasFlag(options::OPT_fprofile_instr_generate,
 160                     options::OPT_fno_profile_instr_generate, false) ||
 161        Args.hasFlag(options::OPT_fprofile_instr_generate_EQ,
 162                     options::OPT_fno_profile_instr_generate, false) ||
 163        Args.hasFlag(options::OPT_fcs_profile_generate,
 164                     options::OPT_fno_profile_generate, false) ||
 165        Args.hasFlag(options::OPT_fcs_profile_generate_EQ,
 166                     options::OPT_fno_profile_generate, false) ||
 167        Args.hasArg(options::OPT_fcreate_profile) ||
 168        Args.hasArg(options::OPT_coverage))
 169     CmdArgs.push_back("-bdbg:namedsects:ss");
 170
 171   if (Arg *A =
 172           Args.getLastArg(clang::driver::options::OPT_mxcoff_build_id_EQ)) {
 173     StringRef BuildId = A->getValue();
 174     if (BuildId[0] != '0' || BuildId[1] != 'x' ||
 175         BuildId.find_if_not(llvm::isHexDigit, 2) != StringRef::npos)
 176       ToolChain.getDriver().Diag(diag::err_drv_unsupported_option_argument)
 177           << A->getSpelling() << BuildId;
 178     else {
 179       std::string LinkerFlag = "-bdbg:ldrinfo:xcoff_binary_id:0x";
 180       if (BuildId.size() % 2) // Prepend a 0 if odd number of digits.
 181         LinkerFlag += "0";
 182       LinkerFlag += BuildId.drop_front(2).lower();
 183       CmdArgs.push_back(Args.MakeArgString(LinkerFlag));
 184     }
 185   }
 186
 187   // Specify linker output file.
 188   assert((Output.isFilename() || Output.isNothing()) && "Invalid output.");
 189   if (Output.isFilename()) {
 190     CmdArgs.push_back("-o");
 191     CmdArgs.push_back(Output.getFilename());
 192   }
 193
 194   // Set linking mode (i.e., 32/64-bit) and the address of
 195   // text and data sections based on arch bit width.
 196   if (IsArch32Bit) {
 197     CmdArgs.push_back("-b32");
 198     CmdArgs.push_back("-bpT:0x10000000");
 199     CmdArgs.push_back("-bpD:0x20000000");
 200   } else {
 201     // Must be 64-bit, otherwise asserted already.
 202     CmdArgs.push_back("-b64");
 203     CmdArgs.push_back("-bpT:0x100000000");
 204     CmdArgs.push_back("-bpD:0x110000000");
 205   }
 206
 207   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles,
 208                    options::OPT_shared, options::OPT_r)) {
 209     auto getCrt0Basename = [&Args, IsArch32Bit] {
 210       if (Arg *A = Args.getLastArgNoClaim(options::OPT_p, options::OPT_pg)) {
 211         // Enable gprofiling when "-pg" is specified.
 212         if (A->getOption().matches(options::OPT_pg))
 213           return IsArch32Bit ? "gcrt0.o" : "gcrt0_64.o";
 214         // Enable profiling when "-p" is specified.
 215         return IsArch32Bit ? "mcrt0.o" : "mcrt0_64.o";
 216       }
 217       return IsArch32Bit ? "crt0.o" : "crt0_64.o";
 218     };
 219
 220     CmdArgs.push_back(
 221         Args.MakeArgString(ToolChain.GetFilePath(getCrt0Basename())));
 222
 223     CmdArgs.push_back(Args.MakeArgString(
 224         ToolChain.GetFilePath(IsArch32Bit ? "crti.o" : "crti_64.o")));
 225   }
 226
 227   // Collect all static constructor and destructor functions in both C and CXX
 228   // language link invocations. This has to come before AddLinkerInputs as the
 229   // implied option needs to precede any other '-bcdtors' settings or
 230   // '-bnocdtors' that '-Wl' might forward.
 231   CmdArgs.push_back("-bcdtors:all:0:s");
 232
 233   // Specify linker input file(s).
 234   AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);
 235
 236   if (D.isUsingLTO()) {
 237     assert(!Inputs.empty() && "Must have at least one input.");
 238     // Find the first filename InputInfo object.
 239     auto Input = llvm::find_if(
 240         Inputs, [](const InputInfo &II) -> bool { return II.isFilename(); });
 241     if (Input == Inputs.end())
 242       // For a very rare case, all of the inputs to the linker are
 243       // InputArg. If that happens, just use the first InputInfo.
 244       Input = Inputs.begin();
 245
 246     addLTOOptions(ToolChain, Args, CmdArgs, Output, *Input,
 247                   D.getLTOMode() == LTOK_Thin);
 248   }
 249
 250   if (Args.hasArg(options::OPT_shared) && !hasExportListLinkerOpts(CmdArgs)) {
 251
 252     const char *CreateExportListExec = Args.MakeArgString(
 253         path::parent_path(ToolChain.getDriver().ClangExecutable) +
 254         "/llvm-nm");
 255     ArgStringList CreateExportCmdArgs;
 256
 257     std::string CreateExportListPath =
 258         C.getDriver().GetTemporaryPath("CreateExportList", "exp");
 259     const char *ExportList =
 260         C.addTempFile(C.getArgs().MakeArgString(CreateExportListPath));
 261
 262     for (const auto &II : Inputs)
 263       if (II.isFilename())
 264         CreateExportCmdArgs.push_back(II.getFilename());
 265
 266     CreateExportCmdArgs.push_back("--export-symbols");
 267     CreateExportCmdArgs.push_back("-X");
 268     if (IsArch32Bit) {
 269       CreateExportCmdArgs.push_back("32");
 270     } else {
 271       // Must be 64-bit, otherwise asserted already.
 272       CreateExportCmdArgs.push_back("64");
 273     }
 274
 275     auto ExpCommand = std::make_unique<Command>(
 276         JA, *this, ResponseFileSupport::None(), CreateExportListExec,
 277         CreateExportCmdArgs, Inputs, Output);
 278     ExpCommand->setRedirectFiles(
 279         {std::nullopt, std::string(ExportList), std::nullopt});
 280     C.addCommand(std::move(ExpCommand));
 281     CmdArgs.push_back(Args.MakeArgString(llvm::Twine("-bE:") + ExportList));
 282   }
 283
 284   // Add directory to library search path.
 285   Args.AddAllArgs(CmdArgs, options::OPT_L);
 286   if (!Args.hasArg(options::OPT_r)) {
 287     ToolChain.AddFilePathLibArgs(Args, CmdArgs);
 288     ToolChain.addProfileRTLibs(Args, CmdArgs);
 289
 290     if (getToolChain().ShouldLinkCXXStdlib(Args))
 291       getToolChain().AddCXXStdlibLibArgs(Args, CmdArgs);
 292
 293     if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
 294       AddRunTimeLibs(ToolChain, D, CmdArgs, Args);
 295
 296       // Add OpenMP runtime if -fopenmp is specified.
 297       if (Args.hasFlag(options::OPT_fopenmp, options::OPT_fopenmp_EQ,
 298                        options::OPT_fno_openmp, false)) {
 299         switch (ToolChain.getDriver().getOpenMPRuntime(Args)) {
 300         case Driver::OMPRT_OMP:
 301           CmdArgs.push_back("-lomp");
 302           break;
 303         case Driver::OMPRT_IOMP5:
 304           CmdArgs.push_back("-liomp5");
 305           break;
 306         case Driver::OMPRT_GOMP:
 307           CmdArgs.push_back("-lgomp");
 308           break;
 309         case Driver::OMPRT_Unknown:
 310           // Already diagnosed.
 311           break;
 312         }
 313       }
 314
 315       // Support POSIX threads if "-pthreads" or "-pthread" is present.
 316       if (Args.hasArg(options::OPT_pthreads, options::OPT_pthread))
 317         CmdArgs.push_back("-lpthreads");
 318
 319       if (D.CCCIsCXX())
 320         CmdArgs.push_back("-lm");
 321
 322       CmdArgs.push_back("-lc");
 323
 324       if (Args.hasArgNoClaim(options::OPT_p, options::OPT_pg)) {
 325         CmdArgs.push_back(Args.MakeArgString((llvm::Twine("-L") + D.SysRoot) +
 326                                              "/lib/profiled"));
 327         CmdArgs.push_back(Args.MakeArgString((llvm::Twine("-L") + D.SysRoot) +
 328                                              "/usr/lib/profiled"));
 329       }
 330     }
 331   }
 332
 333   if (D.IsFlangMode() &&
 334       !Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
 335     addFortranRuntimeLibraryPath(ToolChain, Args, CmdArgs);
 336     addFortranRuntimeLibs(ToolChain, Args, CmdArgs);
 337     CmdArgs.push_back("-lm");
 338     CmdArgs.push_back("-lpthread");
 339   }
 340   const char *Exec = Args.MakeArgString(ToolChain.GetLinkerPath());
 341   C.addCommand(std::make_unique<Command>(JA, *this, ResponseFileSupport::None(),
 342                                          Exec, CmdArgs, Inputs, Output));
 343 }
 344
 345 /// AIX - AIX tool chain which can call as(1) and ld(1) directly.
 346 AIX::AIX(const Driver &D, const llvm::Triple &Triple, const ArgList &Args)
 347     : ToolChain(D, Triple, Args) {
 348   getProgramPaths().push_back(getDriver().Dir);
 349
 350   ParseInlineAsmUsingAsmParser = Args.hasFlag(
 351       options::OPT_fintegrated_as, options::OPT_fno_integrated_as, true);
 352   getLibraryPaths().push_back(getDriver().SysRoot + "/usr/lib");
 353 }
 354
 355 // Returns the effective header sysroot path to use.
 356 // This comes from either -isysroot or --sysroot.
 357 llvm::StringRef
 358 AIX::GetHeaderSysroot(const llvm::opt::ArgList &DriverArgs) const {
 359   if (DriverArgs.hasArg(options::OPT_isysroot))
 360     return DriverArgs.getLastArgValue(options::OPT_isysroot);
 361   if (!getDriver().SysRoot.empty())
 362     return getDriver().SysRoot;
 363   return "/";
 364 }
 365
 366 void AIX::AddOpenMPIncludeArgs(const ArgList &DriverArgs,
 367                                ArgStringList &CC1Args) const {
 368   // Add OpenMP include paths if -fopenmp is specified.
 369   if (DriverArgs.hasFlag(options::OPT_fopenmp, options::OPT_fopenmp_EQ,
 370                          options::OPT_fno_openmp, false)) {
 371     SmallString<128> PathOpenMP;
 372     switch (getDriver().getOpenMPRuntime(DriverArgs)) {
 373     case Driver::OMPRT_OMP:
 374       PathOpenMP = GetHeaderSysroot(DriverArgs);
 375       llvm::sys::path::append(PathOpenMP, "opt/IBM/openxlCSDK", "include",
 376                               "openmp");
 377       addSystemInclude(DriverArgs, CC1Args, PathOpenMP.str());
 378       break;
 379     case Driver::OMPRT_IOMP5:
 380     case Driver::OMPRT_GOMP:
 381     case Driver::OMPRT_Unknown:
 382       // Unknown / unsupported include paths.
 383       break;
 384     }
 385   }
 386 }
 387
 388 void AIX::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
 389                                     ArgStringList &CC1Args) const {
 390   // Return if -nostdinc is specified as a driver option.
 391   if (DriverArgs.hasArg(options::OPT_nostdinc))
 392     return;
 393
 394   llvm::StringRef Sysroot = GetHeaderSysroot(DriverArgs);
 395   const Driver &D = getDriver();
 396
 397   if (!DriverArgs.hasArg(options::OPT_nobuiltininc)) {
 398     SmallString<128> P(D.ResourceDir);
 399     // Add the PowerPC intrinsic headers (<resource>/include/ppc_wrappers)
 400     path::append(P, "include", "ppc_wrappers");
 401     addSystemInclude(DriverArgs, CC1Args, P);
 402     // Add the Clang builtin headers (<resource>/include)
 403     addSystemInclude(DriverArgs, CC1Args, path::parent_path(P.str()));
 404   }
 405
 406   // Add the include directory containing omp.h. This needs to be before
 407   // adding the system include directory because other compilers put their
 408   // omp.h in /usr/include.
 409   AddOpenMPIncludeArgs(DriverArgs, CC1Args);
 410
 411   // Return if -nostdlibinc is specified as a driver option.
 412   if (DriverArgs.hasArg(options::OPT_nostdlibinc))
 413     return;
 414
 415   // Add <sysroot>/usr/include.
 416   SmallString<128> UP(Sysroot);
 417   path::append(UP, "/usr/include");
 418   addSystemInclude(DriverArgs, CC1Args, UP.str());
 419 }
 420
 421 void AIX::AddClangCXXStdlibIncludeArgs(
 422     const llvm::opt::ArgList &DriverArgs,
 423     llvm::opt::ArgStringList &CC1Args) const {
 424
 425   if (DriverArgs.hasArg(options::OPT_nostdinc) ||
 426       DriverArgs.hasArg(options::OPT_nostdincxx) ||
 427       DriverArgs.hasArg(options::OPT_nostdlibinc))
 428     return;
 429
 430   switch (GetCXXStdlibType(DriverArgs)) {
 431   case ToolChain::CST_Libstdcxx:
 432     llvm::report_fatal_error(
 433         "picking up libstdc++ headers is unimplemented on AIX");
 434   case ToolChain::CST_Libcxx: {
 435     llvm::StringRef Sysroot = GetHeaderSysroot(DriverArgs);
 436     SmallString<128> PathCPP(Sysroot);
 437     llvm::sys::path::append(PathCPP, "opt/IBM/openxlCSDK", "include", "c++",
 438                             "v1");
 439     addSystemInclude(DriverArgs, CC1Args, PathCPP.str());
 440     // Required in order to suppress conflicting C++ overloads in the system
 441     // libc headers that were used by XL C++.
 442     CC1Args.push_back("-D__LIBC_NO_CPP_MATH_OVERLOADS__");
 443     return;
 444   }
 445   }
 446
 447   llvm_unreachable("Unexpected C++ library type; only libc++ is supported.");
 448 }
 449
 450 void AIX::AddCXXStdlibLibArgs(const llvm::opt::ArgList &Args,
 451                               llvm::opt::ArgStringList &CmdArgs) const {
 452   switch (GetCXXStdlibType(Args)) {
 453   case ToolChain::CST_Libstdcxx:
 454     llvm::report_fatal_error("linking libstdc++ unimplemented on AIX");
 455   case ToolChain::CST_Libcxx:
 456     CmdArgs.push_back("-lc++");
 457     if (Args.hasArg(options::OPT_fexperimental_library))
 458       CmdArgs.push_back("-lc++experimental");
 459     CmdArgs.push_back("-lc++abi");
 460     return;
 461   }
 462
 463   llvm_unreachable("Unexpected C++ library type; only libc++ is supported.");
 464 }
 465
 466 // This function processes all the mtocdata options to build the final
 467 // simplified toc data options to pass to CC1.
 468 static void addTocDataOptions(const llvm::opt::ArgList &Args,
 469                               llvm::opt::ArgStringList &CC1Args,
 470                               const Driver &D) {
 471
 472   // Check the global toc-data setting. The default is -mno-tocdata.
 473   // To enable toc-data globally, -mtocdata must be specified.
 474   // Additionally, it must be last to take effect.
 475   const bool TOCDataGloballyinEffect = [&Args]() {
 476     if (const Arg *LastArg =
 477             Args.getLastArg(options::OPT_mtocdata, options::OPT_mno_tocdata))
 478       return LastArg->getOption().matches(options::OPT_mtocdata);
 479     else
 480       return false;
 481   }();
 482
 483   enum TOCDataSetting {
 484     AddressInTOC = 0, // Address of the symbol stored in the TOC.
 485     DataInTOC = 1     // Symbol defined in the TOC.
 486   };
 487
 488   const TOCDataSetting DefaultTocDataSetting =
 489       TOCDataGloballyinEffect ? DataInTOC : AddressInTOC;
 490
 491   // Process the list of variables in the explicitly specified options
 492   // -mtocdata= and -mno-tocdata= to see which variables are opposite to
 493   // the global setting of tocdata in TOCDataGloballyinEffect.
 494   // Those that have the opposite setting to TOCDataGloballyinEffect, are added
 495   // to ExplicitlySpecifiedGlobals.
 496   std::set<llvm::StringRef> ExplicitlySpecifiedGlobals;
 497   for (const auto Arg :
 498        Args.filtered(options::OPT_mtocdata_EQ, options::OPT_mno_tocdata_EQ)) {
 499     TOCDataSetting ArgTocDataSetting =
 500         Arg->getOption().matches(options::OPT_mtocdata_EQ) ? DataInTOC
 501                                                            : AddressInTOC;
 502
 503     if (ArgTocDataSetting != DefaultTocDataSetting)
 504       for (const char *Val : Arg->getValues())
 505         ExplicitlySpecifiedGlobals.insert(Val);
 506     else
 507       for (const char *Val : Arg->getValues())
 508         ExplicitlySpecifiedGlobals.erase(Val);
 509   }
 510
 511   auto buildExceptionList = [](const std::set<llvm::StringRef> &ExplicitValues,
 512                                const char *OptionSpelling) {
 513     std::string Option(OptionSpelling);
 514     bool IsFirst = true;
 515     for (const auto &E : ExplicitValues) {
 516       if (!IsFirst)
 517         Option += ",";
 518
 519       IsFirst = false;
 520       Option += E.str();
 521     }
 522     return Option;
 523   };
 524
 525   // Pass the final tocdata options to CC1 consisting of the default
 526   // tocdata option (-mtocdata/-mno-tocdata) along with the list
 527   // option (-mno-tocdata=/-mtocdata=) if there are any explicitly specified
 528   // variables which would be exceptions to the default setting.
 529   const char *TocDataGlobalOption =
 530       TOCDataGloballyinEffect ? "-mtocdata" : "-mno-tocdata";
 531   CC1Args.push_back(TocDataGlobalOption);
 532
 533   const char *TocDataListOption =
 534       TOCDataGloballyinEffect ? "-mno-tocdata=" : "-mtocdata=";
 535   if (!ExplicitlySpecifiedGlobals.empty())
 536     CC1Args.push_back(Args.MakeArgString(llvm::Twine(
 537         buildExceptionList(ExplicitlySpecifiedGlobals, TocDataListOption))));
 538 }
 539
 540 void AIX::addClangTargetOptions(
 541     const llvm::opt::ArgList &Args, llvm::opt::ArgStringList &CC1Args,
 542     Action::OffloadKind DeviceOffloadingKind) const {
 543   Args.AddLastArg(CC1Args, options::OPT_mignore_xcoff_visibility);
 544   Args.AddLastArg(CC1Args, options::OPT_mdefault_visibility_export_mapping_EQ);
 545   Args.addOptInFlag(CC1Args, options::OPT_mxcoff_roptr, options::OPT_mno_xcoff_roptr);
 546
 547   // Forward last mtocdata/mno_tocdata options to -cc1.
 548   if (Args.hasArg(options::OPT_mtocdata_EQ, options::OPT_mno_tocdata_EQ,
 549                   options::OPT_mtocdata))
 550     addTocDataOptions(Args, CC1Args, getDriver());
 551
 552   if (Args.hasArg(options::OPT_msave_reg_params))
 553     CC1Args.push_back("-msave-reg-params");
 554
 555   if (Args.hasFlag(options::OPT_fxl_pragma_pack,
 556                    options::OPT_fno_xl_pragma_pack, true))
 557     CC1Args.push_back("-fxl-pragma-pack");
 558
 559   // Pass "-fno-sized-deallocation" only when the user hasn't manually enabled
 560   // or disabled sized deallocations.
 561   if (!Args.getLastArgNoClaim(options::OPT_fsized_deallocation,
 562                               options::OPT_fno_sized_deallocation))
 563     CC1Args.push_back("-fno-sized-deallocation");
 564 }
 565
 566 void AIX::addProfileRTLibs(const llvm::opt::ArgList &Args,
 567                            llvm::opt::ArgStringList &CmdArgs) const {
 568   if (needsProfileRT(Args)) {
 569     // Add linker option -u__llvm_profile_runtime to cause runtime
 570     // initialization to occur.
 571     CmdArgs.push_back(Args.MakeArgString(
 572         Twine("-u", llvm::getInstrProfRuntimeHookVarName())));
 573
 574     if (const auto *A =
 575             Args.getLastArgNoClaim(options::OPT_fprofile_update_EQ)) {
 576       StringRef Val = A->getValue();
 577       if (Val == "atomic" || Val == "prefer-atomic")
 578         CmdArgs.push_back("-latomic");
 579     }
 580   }
 581
 582   ToolChain::addProfileRTLibs(Args, CmdArgs);
 583 }
 584
 585 ToolChain::CXXStdlibType AIX::GetDefaultCXXStdlibType() const {
 586   return ToolChain::CST_Libcxx;
 587 }
 588
 589 ToolChain::RuntimeLibType AIX::GetDefaultRuntimeLibType() const {
 590   return ToolChain::RLT_CompilerRT;
 591 }
 592
 593 auto AIX::buildAssembler() const -> Tool * { return new aix::Assembler(*this); }
 594
 595 auto AIX::buildLinker() const -> Tool * { return new aix::Linker(*this); }