Gnu.cpp revision 341825 
1//===--- Gnu.cpp - Gnu Tool and ToolChain Implementations -------*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10#include "Gnu.h"
11#include "Arch/ARM.h"
12#include "Arch/Mips.h"
13#include "Arch/PPC.h"
14#include "Arch/RISCV.h"
15#include "Arch/Sparc.h"
16#include "Arch/SystemZ.h"
17#include "CommonArgs.h"
18#include "Linux.h"
19#include "clang/Basic/VirtualFileSystem.h"
20#include "clang/Config/config.h" // for GCC_INSTALL_PREFIX
21#include "clang/Driver/Compilation.h"
22#include "clang/Driver/Driver.h"
23#include "clang/Driver/DriverDiagnostic.h"
24#include "clang/Driver/Options.h"
25#include "clang/Driver/Tool.h"
26#include "llvm/Option/ArgList.h"
27#include "llvm/Support/CodeGen.h"
28#include "llvm/Support/Path.h"
29#include "llvm/Support/TargetParser.h"
30#include <system_error>
31
32using namespace clang::driver;
33using namespace clang::driver::toolchains;
34using namespace clang;
35using namespace llvm::opt;
36
37void tools::GnuTool::anchor() {}
38
39static bool forwardToGCC(const Option &O) {
40  // Don't forward inputs from the original command line.  They are added from
41  // InputInfoList.
42  return O.getKind() != Option::InputClass &&
43         !O.hasFlag(options::DriverOption) && !O.hasFlag(options::LinkerInput);
44}
45
46// Switch CPU names not recognized by GNU assembler to a close CPU that it does
47// recognize, instead of a lower march from being picked in the absence of a cpu
48// flag.
49static void normalizeCPUNamesForAssembler(const ArgList &Args,
50                                          ArgStringList &CmdArgs) {
51  if (Arg *A = Args.getLastArg(options::OPT_mcpu_EQ)) {
52    StringRef CPUArg(A->getValue());
53    if (CPUArg.equals_lower("krait"))
54      CmdArgs.push_back("-mcpu=cortex-a15");
55    else if(CPUArg.equals_lower("kryo"))
56      CmdArgs.push_back("-mcpu=cortex-a57");
57    else
58      Args.AddLastArg(CmdArgs, options::OPT_mcpu_EQ);
59  }
60}
61
62void tools::gcc::Common::ConstructJob(Compilation &C, const JobAction &JA,
63                                      const InputInfo &Output,
64                                      const InputInfoList &Inputs,
65                                      const ArgList &Args,
66                                      const char *LinkingOutput) const {
67  const Driver &D = getToolChain().getDriver();
68  ArgStringList CmdArgs;
69
70  for (const auto &A : Args) {
71    if (forwardToGCC(A->getOption())) {
72      // It is unfortunate that we have to claim here, as this means
73      // we will basically never report anything interesting for
74      // platforms using a generic gcc, even if we are just using gcc
75      // to get to the assembler.
76      A->claim();
77
78      // Don't forward any -g arguments to assembly steps.
79      if (isa<AssembleJobAction>(JA) &&
80          A->getOption().matches(options::OPT_g_Group))
81        continue;
82
83      // Don't forward any -W arguments to assembly and link steps.
84      if ((isa<AssembleJobAction>(JA) || isa<LinkJobAction>(JA)) &&
85          A->getOption().matches(options::OPT_W_Group))
86        continue;
87
88      // Don't forward -mno-unaligned-access since GCC doesn't understand
89      // it and because it doesn't affect the assembly or link steps.
90      if ((isa<AssembleJobAction>(JA) || isa<LinkJobAction>(JA)) &&
91          (A->getOption().matches(options::OPT_munaligned_access) ||
92           A->getOption().matches(options::OPT_mno_unaligned_access)))
93        continue;
94
95      A->render(Args, CmdArgs);
96    }
97  }
98
99  RenderExtraToolArgs(JA, CmdArgs);
100
101  // If using a driver driver, force the arch.
102  if (getToolChain().getTriple().isOSDarwin()) {
103    CmdArgs.push_back("-arch");
104    CmdArgs.push_back(
105        Args.MakeArgString(getToolChain().getDefaultUniversalArchName()));
106  }
107
108  // Try to force gcc to match the tool chain we want, if we recognize
109  // the arch.
110  //
111  // FIXME: The triple class should directly provide the information we want
112  // here.
113  switch (getToolChain().getArch()) {
114  default:
115    break;
116  case llvm::Triple::x86:
117  case llvm::Triple::ppc:
118    CmdArgs.push_back("-m32");
119    break;
120  case llvm::Triple::x86_64:
121  case llvm::Triple::ppc64:
122  case llvm::Triple::ppc64le:
123    CmdArgs.push_back("-m64");
124    break;
125  case llvm::Triple::sparcel:
126    CmdArgs.push_back("-EL");
127    break;
128  }
129
130  if (Output.isFilename()) {
131    CmdArgs.push_back("-o");
132    CmdArgs.push_back(Output.getFilename());
133  } else {
134    assert(Output.isNothing() && "Unexpected output");
135    CmdArgs.push_back("-fsyntax-only");
136  }
137
138  Args.AddAllArgValues(CmdArgs, options::OPT_Wa_COMMA, options::OPT_Xassembler);
139
140  // Only pass -x if gcc will understand it; otherwise hope gcc
141  // understands the suffix correctly. The main use case this would go
142  // wrong in is for linker inputs if they happened to have an odd
143  // suffix; really the only way to get this to happen is a command
144  // like '-x foobar a.c' which will treat a.c like a linker input.
145  //
146  // FIXME: For the linker case specifically, can we safely convert
147  // inputs into '-Wl,' options?
148  for (const auto &II : Inputs) {
149    // Don't try to pass LLVM or AST inputs to a generic gcc.
150    if (types::isLLVMIR(II.getType()))
151      D.Diag(clang::diag::err_drv_no_linker_llvm_support)
152          << getToolChain().getTripleString();
153    else if (II.getType() == types::TY_AST)
154      D.Diag(diag::err_drv_no_ast_support) << getToolChain().getTripleString();
155    else if (II.getType() == types::TY_ModuleFile)
156      D.Diag(diag::err_drv_no_module_support)
157          << getToolChain().getTripleString();
158
159    if (types::canTypeBeUserSpecified(II.getType())) {
160      CmdArgs.push_back("-x");
161      CmdArgs.push_back(types::getTypeName(II.getType()));
162    }
163
164    if (II.isFilename())
165      CmdArgs.push_back(II.getFilename());
166    else {
167      const Arg &A = II.getInputArg();
168
169      // Reverse translate some rewritten options.
170      if (A.getOption().matches(options::OPT_Z_reserved_lib_stdcxx)) {
171        CmdArgs.push_back("-lstdc++");
172        continue;
173      }
174
175      // Don't render as input, we need gcc to do the translations.
176      A.render(Args, CmdArgs);
177    }
178  }
179
180  const std::string &customGCCName = D.getCCCGenericGCCName();
181  const char *GCCName;
182  if (!customGCCName.empty())
183    GCCName = customGCCName.c_str();
184  else if (D.CCCIsCXX()) {
185    GCCName = "g++";
186  } else
187    GCCName = "gcc";
188
189  const char *Exec = Args.MakeArgString(getToolChain().GetProgramPath(GCCName));
190  C.addCommand(llvm::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));
191}
192
193void tools::gcc::Preprocessor::RenderExtraToolArgs(
194    const JobAction &JA, ArgStringList &CmdArgs) const {
195  CmdArgs.push_back("-E");
196}
197
198void tools::gcc::Compiler::RenderExtraToolArgs(const JobAction &JA,
199                                               ArgStringList &CmdArgs) const {
200  const Driver &D = getToolChain().getDriver();
201
202  switch (JA.getType()) {
203  // If -flto, etc. are present then make sure not to force assembly output.
204  case types::TY_LLVM_IR:
205  case types::TY_LTO_IR:
206  case types::TY_LLVM_BC:
207  case types::TY_LTO_BC:
208    CmdArgs.push_back("-c");
209    break;
210  // We assume we've got an "integrated" assembler in that gcc will produce an
211  // object file itself.
212  case types::TY_Object:
213    CmdArgs.push_back("-c");
214    break;
215  case types::TY_PP_Asm:
216    CmdArgs.push_back("-S");
217    break;
218  case types::TY_Nothing:
219    CmdArgs.push_back("-fsyntax-only");
220    break;
221  default:
222    D.Diag(diag::err_drv_invalid_gcc_output_type) << getTypeName(JA.getType());
223  }
224}
225
226void tools::gcc::Linker::RenderExtraToolArgs(const JobAction &JA,
227                                             ArgStringList &CmdArgs) const {
228  // The types are (hopefully) good enough.
229}
230
231static const char *getLDMOption(const llvm::Triple &T, const ArgList &Args) {
232  switch (T.getArch()) {
233  case llvm::Triple::x86:
234    if (T.isOSIAMCU())
235      return "elf_iamcu";
236    return "elf_i386";
237  case llvm::Triple::aarch64:
238    return "aarch64linux";
239  case llvm::Triple::aarch64_be:
240    return "aarch64linuxb";
241  case llvm::Triple::arm:
242  case llvm::Triple::thumb:
243    return "armelf_linux_eabi";
244  case llvm::Triple::armeb:
245  case llvm::Triple::thumbeb:
246    return "armelfb_linux_eabi";
247  case llvm::Triple::ppc:
248    return "elf32ppclinux";
249  case llvm::Triple::ppc64:
250    return "elf64ppc";
251  case llvm::Triple::ppc64le:
252    return "elf64lppc";
253  case llvm::Triple::riscv32:
254    return "elf32lriscv";
255  case llvm::Triple::riscv64:
256    return "elf64lriscv";
257  case llvm::Triple::sparc:
258  case llvm::Triple::sparcel:
259    return "elf32_sparc";
260  case llvm::Triple::sparcv9:
261    return "elf64_sparc";
262  case llvm::Triple::mips:
263    return "elf32btsmip";
264  case llvm::Triple::mipsel:
265    return "elf32ltsmip";
266  case llvm::Triple::mips64:
267    if (tools::mips::hasMipsAbiArg(Args, "n32"))
268      return "elf32btsmipn32";
269    return "elf64btsmip";
270  case llvm::Triple::mips64el:
271    if (tools::mips::hasMipsAbiArg(Args, "n32"))
272      return "elf32ltsmipn32";
273    return "elf64ltsmip";
274  case llvm::Triple::systemz:
275    return "elf64_s390";
276  case llvm::Triple::x86_64:
277    if (T.getEnvironment() == llvm::Triple::GNUX32)
278      return "elf32_x86_64";
279    return "elf_x86_64";
280  default:
281    return nullptr;
282  }
283}
284
285static bool getPIE(const ArgList &Args, const toolchains::Linux &ToolChain) {
286  if (Args.hasArg(options::OPT_shared) || Args.hasArg(options::OPT_static) ||
287      Args.hasArg(options::OPT_r))
288    return false;
289
290  Arg *A = Args.getLastArg(options::OPT_pie, options::OPT_no_pie,
291                           options::OPT_nopie);
292  if (!A)
293    return ToolChain.isPIEDefault();
294  return A->getOption().matches(options::OPT_pie);
295}
296
297void tools::gnutools::Linker::ConstructJob(Compilation &C, const JobAction &JA,
298                                           const InputInfo &Output,
299                                           const InputInfoList &Inputs,
300                                           const ArgList &Args,
301                                           const char *LinkingOutput) const {
302  const toolchains::Linux &ToolChain =
303      static_cast<const toolchains::Linux &>(getToolChain());
304  const Driver &D = ToolChain.getDriver();
305
306  const llvm::Triple &Triple = getToolChain().getEffectiveTriple();
307
308  const llvm::Triple::ArchType Arch = ToolChain.getArch();
309  const bool isAndroid = ToolChain.getTriple().isAndroid();
310  const bool IsIAMCU = ToolChain.getTriple().isOSIAMCU();
311  const bool IsPIE = getPIE(Args, ToolChain);
312  const bool HasCRTBeginEndFiles =
313      ToolChain.getTriple().hasEnvironment() ||
314      (ToolChain.getTriple().getVendor() != llvm::Triple::MipsTechnologies);
315
316  ArgStringList CmdArgs;
317
318  // Silence warning for "clang -g foo.o -o foo"
319  Args.ClaimAllArgs(options::OPT_g_Group);
320  // and "clang -emit-llvm foo.o -o foo"
321  Args.ClaimAllArgs(options::OPT_emit_llvm);
322  // and for "clang -w foo.o -o foo". Other warning options are already
323  // handled somewhere else.
324  Args.ClaimAllArgs(options::OPT_w);
325
326  const char *Exec = Args.MakeArgString(ToolChain.GetLinkerPath());
327  if (llvm::sys::path::stem(Exec) == "lld") {
328    CmdArgs.push_back("-flavor");
329    CmdArgs.push_back("old-gnu");
330    CmdArgs.push_back("-target");
331    CmdArgs.push_back(Args.MakeArgString(getToolChain().getTripleString()));
332  }
333
334  if (!D.SysRoot.empty())
335    CmdArgs.push_back(Args.MakeArgString("--sysroot=" + D.SysRoot));
336
337  if (IsPIE)
338    CmdArgs.push_back("-pie");
339
340  if (Args.hasArg(options::OPT_rdynamic))
341    CmdArgs.push_back("-export-dynamic");
342
343  if (Args.hasArg(options::OPT_s))
344    CmdArgs.push_back("-s");
345
346  if (Arch == llvm::Triple::armeb || Arch == llvm::Triple::thumbeb)
347    arm::appendEBLinkFlags(Args, CmdArgs, Triple);
348
349  // Most Android ARM64 targets should enable the linker fix for erratum
350  // 843419. Only non-Cortex-A53 devices are allowed to skip this flag.
351  if (Arch == llvm::Triple::aarch64 && isAndroid) {
352    std::string CPU = getCPUName(Args, Triple);
353    if (CPU.empty() || CPU == "generic" || CPU == "cortex-a53")
354      CmdArgs.push_back("--fix-cortex-a53-843419");
355  }
356
357  for (const auto &Opt : ToolChain.ExtraOpts)
358    CmdArgs.push_back(Opt.c_str());
359
360  CmdArgs.push_back("--eh-frame-hdr");
361
362  if (const char *LDMOption = getLDMOption(ToolChain.getTriple(), Args)) {
363    CmdArgs.push_back("-m");
364    CmdArgs.push_back(LDMOption);
365  } else {
366    D.Diag(diag::err_target_unknown_triple) << Triple.str();
367    return;
368  }
369
370  if (Args.hasArg(options::OPT_static)) {
371    if (Arch == llvm::Triple::arm || Arch == llvm::Triple::armeb ||
372        Arch == llvm::Triple::thumb || Arch == llvm::Triple::thumbeb)
373      CmdArgs.push_back("-Bstatic");
374    else
375      CmdArgs.push_back("-static");
376  } else if (Args.hasArg(options::OPT_shared)) {
377    CmdArgs.push_back("-shared");
378  }
379
380  if (!Args.hasArg(options::OPT_static)) {
381    if (Args.hasArg(options::OPT_rdynamic))
382      CmdArgs.push_back("-export-dynamic");
383
384    if (!Args.hasArg(options::OPT_shared)) {
385      const std::string Loader =
386          D.DyldPrefix + ToolChain.getDynamicLinker(Args);
387      CmdArgs.push_back("-dynamic-linker");
388      CmdArgs.push_back(Args.MakeArgString(Loader));
389    }
390  }
391
392  CmdArgs.push_back("-o");
393  CmdArgs.push_back(Output.getFilename());
394
395  if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles)) {
396    if (!isAndroid && !IsIAMCU) {
397      const char *crt1 = nullptr;
398      if (!Args.hasArg(options::OPT_shared)) {
399        if (Args.hasArg(options::OPT_pg))
400          crt1 = "gcrt1.o";
401        else if (IsPIE)
402          crt1 = "Scrt1.o";
403        else
404          crt1 = "crt1.o";
405      }
406      if (crt1)
407        CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crt1)));
408
409      CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crti.o")));
410    }
411
412    if (IsIAMCU)
413      CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crt0.o")));
414    else {
415      const char *crtbegin;
416      if (Args.hasArg(options::OPT_static))
417        crtbegin = isAndroid ? "crtbegin_static.o" : "crtbeginT.o";
418      else if (Args.hasArg(options::OPT_shared))
419        crtbegin = isAndroid ? "crtbegin_so.o" : "crtbeginS.o";
420      else if (IsPIE)
421        crtbegin = isAndroid ? "crtbegin_dynamic.o" : "crtbeginS.o";
422      else
423        crtbegin = isAndroid ? "crtbegin_dynamic.o" : "crtbegin.o";
424
425      if (HasCRTBeginEndFiles)
426        CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtbegin)));
427    }
428
429    // Add crtfastmath.o if available and fast math is enabled.
430    ToolChain.AddFastMathRuntimeIfAvailable(Args, CmdArgs);
431  }
432
433  Args.AddAllArgs(CmdArgs, options::OPT_L);
434  Args.AddAllArgs(CmdArgs, options::OPT_u);
435
436  ToolChain.AddFilePathLibArgs(Args, CmdArgs);
437
438  if (D.isUsingLTO()) {
439    assert(!Inputs.empty() && "Must have at least one input.");
440    AddGoldPlugin(ToolChain, Args, CmdArgs, Output, Inputs[0],
441                  D.getLTOMode() == LTOK_Thin);
442  }
443
444  if (Args.hasArg(options::OPT_Z_Xlinker__no_demangle))
445    CmdArgs.push_back("--no-demangle");
446
447  bool NeedsSanitizerDeps = addSanitizerRuntimes(ToolChain, Args, CmdArgs);
448  bool NeedsXRayDeps = addXRayRuntime(ToolChain, Args, CmdArgs);
449  AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);
450  // The profile runtime also needs access to system libraries.
451  getToolChain().addProfileRTLibs(Args, CmdArgs);
452
453  if (D.CCCIsCXX() &&
454      !Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
455    if (ToolChain.ShouldLinkCXXStdlib(Args)) {
456      bool OnlyLibstdcxxStatic = Args.hasArg(options::OPT_static_libstdcxx) &&
457                                 !Args.hasArg(options::OPT_static);
458      if (OnlyLibstdcxxStatic)
459        CmdArgs.push_back("-Bstatic");
460      ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
461      if (OnlyLibstdcxxStatic)
462        CmdArgs.push_back("-Bdynamic");
463    }
464    CmdArgs.push_back("-lm");
465  }
466  // Silence warnings when linking C code with a C++ '-stdlib' argument.
467  Args.ClaimAllArgs(options::OPT_stdlib_EQ);
468
469  if (!Args.hasArg(options::OPT_nostdlib)) {
470    if (!Args.hasArg(options::OPT_nodefaultlibs)) {
471      if (Args.hasArg(options::OPT_static))
472        CmdArgs.push_back("--start-group");
473
474      if (NeedsSanitizerDeps)
475        linkSanitizerRuntimeDeps(ToolChain, CmdArgs);
476
477      if (NeedsXRayDeps)
478        linkXRayRuntimeDeps(ToolChain, CmdArgs);
479
480      bool WantPthread = Args.hasArg(options::OPT_pthread) ||
481                         Args.hasArg(options::OPT_pthreads);
482
483      // FIXME: Only pass GompNeedsRT = true for platforms with libgomp that
484      // require librt. Most modern Linux platforms do, but some may not.
485      if (addOpenMPRuntime(CmdArgs, ToolChain, Args,
486                           JA.isHostOffloading(Action::OFK_OpenMP),
487                           /* GompNeedsRT= */ true))
488        // OpenMP runtimes implies pthreads when using the GNU toolchain.
489        // FIXME: Does this really make sense for all GNU toolchains?
490        WantPthread = true;
491
492      AddRunTimeLibs(ToolChain, D, CmdArgs, Args);
493
494      if (WantPthread && !isAndroid)
495        CmdArgs.push_back("-lpthread");
496
497      if (Args.hasArg(options::OPT_fsplit_stack))
498        CmdArgs.push_back("--wrap=pthread_create");
499
500      CmdArgs.push_back("-lc");
501
502      // Add IAMCU specific libs, if needed.
503      if (IsIAMCU)
504        CmdArgs.push_back("-lgloss");
505
506      if (Args.hasArg(options::OPT_static))
507        CmdArgs.push_back("--end-group");
508      else
509        AddRunTimeLibs(ToolChain, D, CmdArgs, Args);
510
511      // Add IAMCU specific libs (outside the group), if needed.
512      if (IsIAMCU) {
513        CmdArgs.push_back("--as-needed");
514        CmdArgs.push_back("-lsoftfp");
515        CmdArgs.push_back("--no-as-needed");
516      }
517    }
518
519    if (!Args.hasArg(options::OPT_nostartfiles) && !IsIAMCU) {
520      const char *crtend;
521      if (Args.hasArg(options::OPT_shared))
522        crtend = isAndroid ? "crtend_so.o" : "crtendS.o";
523      else if (IsPIE)
524        crtend = isAndroid ? "crtend_android.o" : "crtendS.o";
525      else
526        crtend = isAndroid ? "crtend_android.o" : "crtend.o";
527
528      if (HasCRTBeginEndFiles)
529        CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtend)));
530      if (!isAndroid)
531        CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crtn.o")));
532    }
533  }
534
535  // Add OpenMP offloading linker script args if required.
536  AddOpenMPLinkerScript(getToolChain(), C, Output, Inputs, Args, CmdArgs, JA);
537
538  // Add HIP offloading linker script args if required.
539  AddHIPLinkerScript(getToolChain(), C, Output, Inputs, Args, CmdArgs, JA,
540                     *this);
541
542  C.addCommand(llvm::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));
543}
544
545void tools::gnutools::Assembler::ConstructJob(Compilation &C,
546                                              const JobAction &JA,
547                                              const InputInfo &Output,
548                                              const InputInfoList &Inputs,
549                                              const ArgList &Args,
550                                              const char *LinkingOutput) const {
551  const auto &D = getToolChain().getDriver();
552
553  claimNoWarnArgs(Args);
554
555  ArgStringList CmdArgs;
556
557  llvm::Reloc::Model RelocationModel;
558  unsigned PICLevel;
559  bool IsPIE;
560  std::tie(RelocationModel, PICLevel, IsPIE) =
561      ParsePICArgs(getToolChain(), Args);
562
563  if (const Arg *A = Args.getLastArg(options::OPT_gz, options::OPT_gz_EQ)) {
564    if (A->getOption().getID() == options::OPT_gz) {
565      CmdArgs.push_back("-compress-debug-sections");
566    } else {
567      StringRef Value = A->getValue();
568      if (Value == "none") {
569        CmdArgs.push_back("-compress-debug-sections=none");
570      } else if (Value == "zlib" || Value == "zlib-gnu") {
571        CmdArgs.push_back(
572            Args.MakeArgString("-compress-debug-sections=" + Twine(Value)));
573      } else {
574        D.Diag(diag::err_drv_unsupported_option_argument)
575            << A->getOption().getName() << Value;
576      }
577    }
578  }
579
580  switch (getToolChain().getArch()) {
581  default:
582    break;
583  // Add --32/--64 to make sure we get the format we want.
584  // This is incomplete
585  case llvm::Triple::x86:
586    CmdArgs.push_back("--32");
587    break;
588  case llvm::Triple::x86_64:
589    if (getToolChain().getTriple().getEnvironment() == llvm::Triple::GNUX32)
590      CmdArgs.push_back("--x32");
591    else
592      CmdArgs.push_back("--64");
593    break;
594  case llvm::Triple::ppc: {
595    CmdArgs.push_back("-a32");
596    CmdArgs.push_back("-mppc");
597    CmdArgs.push_back(
598      ppc::getPPCAsmModeForCPU(getCPUName(Args, getToolChain().getTriple())));
599    break;
600  }
601  case llvm::Triple::ppc64: {
602    CmdArgs.push_back("-a64");
603    CmdArgs.push_back("-mppc64");
604    CmdArgs.push_back(
605      ppc::getPPCAsmModeForCPU(getCPUName(Args, getToolChain().getTriple())));
606    break;
607  }
608  case llvm::Triple::ppc64le: {
609    CmdArgs.push_back("-a64");
610    CmdArgs.push_back("-mppc64");
611    CmdArgs.push_back("-mlittle-endian");
612    CmdArgs.push_back(
613      ppc::getPPCAsmModeForCPU(getCPUName(Args, getToolChain().getTriple())));
614    break;
615  }
616  case llvm::Triple::riscv32:
617  case llvm::Triple::riscv64: {
618    StringRef ABIName = riscv::getRISCVABI(Args, getToolChain().getTriple());
619    CmdArgs.push_back("-mabi");
620    CmdArgs.push_back(ABIName.data());
621    if (const Arg *A = Args.getLastArg(options::OPT_march_EQ)) {
622      StringRef MArch = A->getValue();
623      CmdArgs.push_back("-march");
624      CmdArgs.push_back(MArch.data());
625    }
626    break;
627  }
628  case llvm::Triple::sparc:
629  case llvm::Triple::sparcel: {
630    CmdArgs.push_back("-32");
631    std::string CPU = getCPUName(Args, getToolChain().getTriple());
632    CmdArgs.push_back(sparc::getSparcAsmModeForCPU(CPU, getToolChain().getTriple()));
633    AddAssemblerKPIC(getToolChain(), Args, CmdArgs);
634    break;
635  }
636  case llvm::Triple::sparcv9: {
637    CmdArgs.push_back("-64");
638    std::string CPU = getCPUName(Args, getToolChain().getTriple());
639    CmdArgs.push_back(sparc::getSparcAsmModeForCPU(CPU, getToolChain().getTriple()));
640    AddAssemblerKPIC(getToolChain(), Args, CmdArgs);
641    break;
642  }
643  case llvm::Triple::arm:
644  case llvm::Triple::armeb:
645  case llvm::Triple::thumb:
646  case llvm::Triple::thumbeb: {
647    const llvm::Triple &Triple2 = getToolChain().getTriple();
648    switch (Triple2.getSubArch()) {
649    case llvm::Triple::ARMSubArch_v7:
650      CmdArgs.push_back("-mfpu=neon");
651      break;
652    case llvm::Triple::ARMSubArch_v8:
653      CmdArgs.push_back("-mfpu=crypto-neon-fp-armv8");
654      break;
655    default:
656      break;
657    }
658
659    switch (arm::getARMFloatABI(getToolChain(), Args)) {
660    case arm::FloatABI::Invalid: llvm_unreachable("must have an ABI!");
661    case arm::FloatABI::Soft:
662      CmdArgs.push_back(Args.MakeArgString("-mfloat-abi=soft"));
663      break;
664    case arm::FloatABI::SoftFP:
665      CmdArgs.push_back(Args.MakeArgString("-mfloat-abi=softfp"));
666      break;
667    case arm::FloatABI::Hard:
668      CmdArgs.push_back(Args.MakeArgString("-mfloat-abi=hard"));
669      break;
670    }
671
672    Args.AddLastArg(CmdArgs, options::OPT_march_EQ);
673    normalizeCPUNamesForAssembler(Args, CmdArgs);
674
675    Args.AddLastArg(CmdArgs, options::OPT_mfpu_EQ);
676    break;
677  }
678  case llvm::Triple::aarch64:
679  case llvm::Triple::aarch64_be: {
680    Args.AddLastArg(CmdArgs, options::OPT_march_EQ);
681    normalizeCPUNamesForAssembler(Args, CmdArgs);
682
683    break;
684  }
685  case llvm::Triple::mips:
686  case llvm::Triple::mipsel:
687  case llvm::Triple::mips64:
688  case llvm::Triple::mips64el: {
689    StringRef CPUName;
690    StringRef ABIName;
691    mips::getMipsCPUAndABI(Args, getToolChain().getTriple(), CPUName, ABIName);
692    ABIName = mips::getGnuCompatibleMipsABIName(ABIName);
693
694    CmdArgs.push_back("-march");
695    CmdArgs.push_back(CPUName.data());
696
697    CmdArgs.push_back("-mabi");
698    CmdArgs.push_back(ABIName.data());
699
700    // -mno-shared should be emitted unless -fpic, -fpie, -fPIC, -fPIE,
701    // or -mshared (not implemented) is in effect.
702    if (RelocationModel == llvm::Reloc::Static)
703      CmdArgs.push_back("-mno-shared");
704
705    // LLVM doesn't support -mplt yet and acts as if it is always given.
706    // However, -mplt has no effect with the N64 ABI.
707    if (ABIName != "64" && !Args.hasArg(options::OPT_mno_abicalls))
708      CmdArgs.push_back("-call_nonpic");
709
710    if (getToolChain().getTriple().isLittleEndian())
711      CmdArgs.push_back("-EL");
712    else
713      CmdArgs.push_back("-EB");
714
715    if (Arg *A = Args.getLastArg(options::OPT_mnan_EQ)) {
716      if (StringRef(A->getValue()) == "2008")
717        CmdArgs.push_back(Args.MakeArgString("-mnan=2008"));
718    }
719
720    // Add the last -mfp32/-mfpxx/-mfp64 or -mfpxx if it is enabled by default.
721    if (Arg *A = Args.getLastArg(options::OPT_mfp32, options::OPT_mfpxx,
722                                 options::OPT_mfp64)) {
723      A->claim();
724      A->render(Args, CmdArgs);
725    } else if (mips::shouldUseFPXX(
726                   Args, getToolChain().getTriple(), CPUName, ABIName,
727                   mips::getMipsFloatABI(getToolChain().getDriver(), Args)))
728      CmdArgs.push_back("-mfpxx");
729
730    // Pass on -mmips16 or -mno-mips16. However, the assembler equivalent of
731    // -mno-mips16 is actually -no-mips16.
732    if (Arg *A =
733            Args.getLastArg(options::OPT_mips16, options::OPT_mno_mips16)) {
734      if (A->getOption().matches(options::OPT_mips16)) {
735        A->claim();
736        A->render(Args, CmdArgs);
737      } else {
738        A->claim();
739        CmdArgs.push_back("-no-mips16");
740      }
741    }
742
743    Args.AddLastArg(CmdArgs, options::OPT_mmicromips,
744                    options::OPT_mno_micromips);
745    Args.AddLastArg(CmdArgs, options::OPT_mdsp, options::OPT_mno_dsp);
746    Args.AddLastArg(CmdArgs, options::OPT_mdspr2, options::OPT_mno_dspr2);
747
748    if (Arg *A = Args.getLastArg(options::OPT_mmsa, options::OPT_mno_msa)) {
749      // Do not use AddLastArg because not all versions of MIPS assembler
750      // support -mmsa / -mno-msa options.
751      if (A->getOption().matches(options::OPT_mmsa))
752        CmdArgs.push_back(Args.MakeArgString("-mmsa"));
753    }
754
755    Args.AddLastArg(CmdArgs, options::OPT_mhard_float,
756                    options::OPT_msoft_float);
757
758    Args.AddLastArg(CmdArgs, options::OPT_mdouble_float,
759                    options::OPT_msingle_float);
760
761    Args.AddLastArg(CmdArgs, options::OPT_modd_spreg,
762                    options::OPT_mno_odd_spreg);
763
764    AddAssemblerKPIC(getToolChain(), Args, CmdArgs);
765    break;
766  }
767  case llvm::Triple::systemz: {
768    // Always pass an -march option, since our default of z10 is later
769    // than the GNU assembler's default.
770    StringRef CPUName = systemz::getSystemZTargetCPU(Args);
771    CmdArgs.push_back(Args.MakeArgString("-march=" + CPUName));
772    break;
773  }
774  }
775
776  Args.AddAllArgs(CmdArgs, options::OPT_I);
777  Args.AddAllArgValues(CmdArgs, options::OPT_Wa_COMMA, options::OPT_Xassembler);
778
779  CmdArgs.push_back("-o");
780  CmdArgs.push_back(Output.getFilename());
781
782  for (const auto &II : Inputs)
783    CmdArgs.push_back(II.getFilename());
784
785  const char *Exec = Args.MakeArgString(getToolChain().GetProgramPath("as"));
786  C.addCommand(llvm::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));
787
788  // Handle the debug info splitting at object creation time if we're
789  // creating an object.
790  // TODO: Currently only works on linux with newer objcopy.
791  if (Args.hasArg(options::OPT_gsplit_dwarf) &&
792      getToolChain().getTriple().isOSLinux())
793    SplitDebugInfo(getToolChain(), C, *this, JA, Args, Output,
794                   SplitDebugName(Args, Inputs[0]));
795}
796
797namespace {
798// Filter to remove Multilibs that don't exist as a suffix to Path
799class FilterNonExistent {
800  StringRef Base, File;
801  vfs::FileSystem &VFS;
802
803public:
804  FilterNonExistent(StringRef Base, StringRef File, vfs::FileSystem &VFS)
805      : Base(Base), File(File), VFS(VFS) {}
806  bool operator()(const Multilib &M) {
807    return !VFS.exists(Base + M.gccSuffix() + File);
808  }
809};
810} // end anonymous namespace
811
812static bool isSoftFloatABI(const ArgList &Args) {
813  Arg *A = Args.getLastArg(options::OPT_msoft_float, options::OPT_mhard_float,
814                           options::OPT_mfloat_abi_EQ);
815  if (!A)
816    return false;
817
818  return A->getOption().matches(options::OPT_msoft_float) ||
819         (A->getOption().matches(options::OPT_mfloat_abi_EQ) &&
820          A->getValue() == StringRef("soft"));
821}
822
823/// \p Flag must be a flag accepted by the driver with its leading '-' removed,
824//     otherwise '-print-multi-lib' will not emit them correctly.
825static void addMultilibFlag(bool Enabled, const char *const Flag,
826                            std::vector<std::string> &Flags) {
827  if (Enabled)
828    Flags.push_back(std::string("+") + Flag);
829  else
830    Flags.push_back(std::string("-") + Flag);
831}
832
833static bool isArmOrThumbArch(llvm::Triple::ArchType Arch) {
834  return Arch == llvm::Triple::arm || Arch == llvm::Triple::thumb;
835}
836
837static bool isMipsEL(llvm::Triple::ArchType Arch) {
838  return Arch == llvm::Triple::mipsel || Arch == llvm::Triple::mips64el;
839}
840
841static bool isMips16(const ArgList &Args) {
842  Arg *A = Args.getLastArg(options::OPT_mips16, options::OPT_mno_mips16);
843  return A && A->getOption().matches(options::OPT_mips16);
844}
845
846static bool isMicroMips(const ArgList &Args) {
847  Arg *A = Args.getLastArg(options::OPT_mmicromips, options::OPT_mno_micromips);
848  return A && A->getOption().matches(options::OPT_mmicromips);
849}
850
851static bool isRISCV(llvm::Triple::ArchType Arch) {
852  return Arch == llvm::Triple::riscv32 || Arch == llvm::Triple::riscv64;
853}
854
855static Multilib makeMultilib(StringRef commonSuffix) {
856  return Multilib(commonSuffix, commonSuffix, commonSuffix);
857}
858
859static bool findMipsCsMultilibs(const Multilib::flags_list &Flags,
860                                FilterNonExistent &NonExistent,
861                                DetectedMultilibs &Result) {
862  // Check for Code Sourcery toolchain multilibs
863  MultilibSet CSMipsMultilibs;
864  {
865    auto MArchMips16 = makeMultilib("/mips16").flag("+m32").flag("+mips16");
866
867    auto MArchMicroMips =
868        makeMultilib("/micromips").flag("+m32").flag("+mmicromips");
869
870    auto MArchDefault = makeMultilib("").flag("-mips16").flag("-mmicromips");
871
872    auto UCLibc = makeMultilib("/uclibc").flag("+muclibc");
873
874    auto SoftFloat = makeMultilib("/soft-float").flag("+msoft-float");
875
876    auto Nan2008 = makeMultilib("/nan2008").flag("+mnan=2008");
877
878    auto DefaultFloat =
879        makeMultilib("").flag("-msoft-float").flag("-mnan=2008");
880
881    auto BigEndian = makeMultilib("").flag("+EB").flag("-EL");
882
883    auto LittleEndian = makeMultilib("/el").flag("+EL").flag("-EB");
884
885    // Note that this one's osSuffix is ""
886    auto MAbi64 = makeMultilib("")
887                      .gccSuffix("/64")
888                      .includeSuffix("/64")
889                      .flag("+mabi=n64")
890                      .flag("-mabi=n32")
891                      .flag("-m32");
892
893    CSMipsMultilibs =
894        MultilibSet()
895            .Either(MArchMips16, MArchMicroMips, MArchDefault)
896            .Maybe(UCLibc)
897            .Either(SoftFloat, Nan2008, DefaultFloat)
898            .FilterOut("/micromips/nan2008")
899            .FilterOut("/mips16/nan2008")
900            .Either(BigEndian, LittleEndian)
901            .Maybe(MAbi64)
902            .FilterOut("/mips16.*/64")
903            .FilterOut("/micromips.*/64")
904            .FilterOut(NonExistent)
905            .setIncludeDirsCallback([](const Multilib &M) {
906              std::vector<std::string> Dirs({"/include"});
907              if (StringRef(M.includeSuffix()).startswith("/uclibc"))
908                Dirs.push_back(
909                    "/../../../../mips-linux-gnu/libc/uclibc/usr/include");
910              else
911                Dirs.push_back("/../../../../mips-linux-gnu/libc/usr/include");
912              return Dirs;
913            });
914  }
915
916  MultilibSet DebianMipsMultilibs;
917  {
918    Multilib MAbiN32 =
919        Multilib().gccSuffix("/n32").includeSuffix("/n32").flag("+mabi=n32");
920
921    Multilib M64 = Multilib()
922                       .gccSuffix("/64")
923                       .includeSuffix("/64")
924                       .flag("+m64")
925                       .flag("-m32")
926                       .flag("-mabi=n32");
927
928    Multilib M32 = Multilib().flag("-m64").flag("+m32").flag("-mabi=n32");
929
930    DebianMipsMultilibs =
931        MultilibSet().Either(M32, M64, MAbiN32).FilterOut(NonExistent);
932  }
933
934  // Sort candidates. Toolchain that best meets the directories tree goes first.
935  // Then select the first toolchains matches command line flags.
936  MultilibSet *Candidates[] = {&CSMipsMultilibs, &DebianMipsMultilibs};
937  if (CSMipsMultilibs.size() < DebianMipsMultilibs.size())
938    std::iter_swap(Candidates, Candidates + 1);
939  for (const MultilibSet *Candidate : Candidates) {
940    if (Candidate->select(Flags, Result.SelectedMultilib)) {
941      if (Candidate == &DebianMipsMultilibs)
942        Result.BiarchSibling = Multilib();
943      Result.Multilibs = *Candidate;
944      return true;
945    }
946  }
947  return false;
948}
949
950static bool findMipsAndroidMultilibs(vfs::FileSystem &VFS, StringRef Path,
951                                     const Multilib::flags_list &Flags,
952                                     FilterNonExistent &NonExistent,
953                                     DetectedMultilibs &Result) {
954
955  MultilibSet AndroidMipsMultilibs =
956      MultilibSet()
957          .Maybe(Multilib("/mips-r2").flag("+march=mips32r2"))
958          .Maybe(Multilib("/mips-r6").flag("+march=mips32r6"))
959          .FilterOut(NonExistent);
960
961  MultilibSet AndroidMipselMultilibs =
962      MultilibSet()
963          .Either(Multilib().flag("+march=mips32"),
964                  Multilib("/mips-r2", "", "/mips-r2").flag("+march=mips32r2"),
965                  Multilib("/mips-r6", "", "/mips-r6").flag("+march=mips32r6"))
966          .FilterOut(NonExistent);
967
968  MultilibSet AndroidMips64elMultilibs =
969      MultilibSet()
970          .Either(
971              Multilib().flag("+march=mips64r6"),
972              Multilib("/32/mips-r1", "", "/mips-r1").flag("+march=mips32"),
973              Multilib("/32/mips-r2", "", "/mips-r2").flag("+march=mips32r2"),
974              Multilib("/32/mips-r6", "", "/mips-r6").flag("+march=mips32r6"))
975          .FilterOut(NonExistent);
976
977  MultilibSet *MS = &AndroidMipsMultilibs;
978  if (VFS.exists(Path + "/mips-r6"))
979    MS = &AndroidMipselMultilibs;
980  else if (VFS.exists(Path + "/32"))
981    MS = &AndroidMips64elMultilibs;
982  if (MS->select(Flags, Result.SelectedMultilib)) {
983    Result.Multilibs = *MS;
984    return true;
985  }
986  return false;
987}
988
989static bool findMipsMuslMultilibs(const Multilib::flags_list &Flags,
990                                  FilterNonExistent &NonExistent,
991                                  DetectedMultilibs &Result) {
992  // Musl toolchain multilibs
993  MultilibSet MuslMipsMultilibs;
994  {
995    auto MArchMipsR2 = makeMultilib("")
996                           .osSuffix("/mips-r2-hard-musl")
997                           .flag("+EB")
998                           .flag("-EL")
999                           .flag("+march=mips32r2");
1000
1001    auto MArchMipselR2 = makeMultilib("/mipsel-r2-hard-musl")
1002                             .flag("-EB")
1003                             .flag("+EL")
1004                             .flag("+march=mips32r2");
1005
1006    MuslMipsMultilibs = MultilibSet().Either(MArchMipsR2, MArchMipselR2);
1007
1008    // Specify the callback that computes the include directories.
1009    MuslMipsMultilibs.setIncludeDirsCallback([](const Multilib &M) {
1010      return std::vector<std::string>(
1011          {"/../sysroot" + M.osSuffix() + "/usr/include"});
1012    });
1013  }
1014  if (MuslMipsMultilibs.select(Flags, Result.SelectedMultilib)) {
1015    Result.Multilibs = MuslMipsMultilibs;
1016    return true;
1017  }
1018  return false;
1019}
1020
1021static bool findMipsMtiMultilibs(const Multilib::flags_list &Flags,
1022                                 FilterNonExistent &NonExistent,
1023                                 DetectedMultilibs &Result) {
1024  // CodeScape MTI toolchain v1.2 and early.
1025  MultilibSet MtiMipsMultilibsV1;
1026  {
1027    auto MArchMips32 = makeMultilib("/mips32")
1028                           .flag("+m32")
1029                           .flag("-m64")
1030                           .flag("-mmicromips")
1031                           .flag("+march=mips32");
1032
1033    auto MArchMicroMips = makeMultilib("/micromips")
1034                              .flag("+m32")
1035                              .flag("-m64")
1036                              .flag("+mmicromips");
1037
1038    auto MArchMips64r2 = makeMultilib("/mips64r2")
1039                             .flag("-m32")
1040                             .flag("+m64")
1041                             .flag("+march=mips64r2");
1042
1043    auto MArchMips64 = makeMultilib("/mips64").flag("-m32").flag("+m64").flag(
1044        "-march=mips64r2");
1045
1046    auto MArchDefault = makeMultilib("")
1047                            .flag("+m32")
1048                            .flag("-m64")
1049                            .flag("-mmicromips")
1050                            .flag("+march=mips32r2");
1051
1052    auto Mips16 = makeMultilib("/mips16").flag("+mips16");
1053
1054    auto UCLibc = makeMultilib("/uclibc").flag("+muclibc");
1055
1056    auto MAbi64 =
1057        makeMultilib("/64").flag("+mabi=n64").flag("-mabi=n32").flag("-m32");
1058
1059    auto BigEndian = makeMultilib("").flag("+EB").flag("-EL");
1060
1061    auto LittleEndian = makeMultilib("/el").flag("+EL").flag("-EB");
1062
1063    auto SoftFloat = makeMultilib("/sof").flag("+msoft-float");
1064
1065    auto Nan2008 = makeMultilib("/nan2008").flag("+mnan=2008");
1066
1067    MtiMipsMultilibsV1 =
1068        MultilibSet()
1069            .Either(MArchMips32, MArchMicroMips, MArchMips64r2, MArchMips64,
1070                    MArchDefault)
1071            .Maybe(UCLibc)
1072            .Maybe(Mips16)
1073            .FilterOut("/mips64/mips16")
1074            .FilterOut("/mips64r2/mips16")
1075            .FilterOut("/micromips/mips16")
1076            .Maybe(MAbi64)
1077            .FilterOut("/micromips/64")
1078            .FilterOut("/mips32/64")
1079            .FilterOut("^/64")
1080            .FilterOut("/mips16/64")
1081            .Either(BigEndian, LittleEndian)
1082            .Maybe(SoftFloat)
1083            .Maybe(Nan2008)
1084            .FilterOut(".*sof/nan2008")
1085            .FilterOut(NonExistent)
1086            .setIncludeDirsCallback([](const Multilib &M) {
1087              std::vector<std::string> Dirs({"/include"});
1088              if (StringRef(M.includeSuffix()).startswith("/uclibc"))
1089                Dirs.push_back("/../../../../sysroot/uclibc/usr/include");
1090              else
1091                Dirs.push_back("/../../../../sysroot/usr/include");
1092              return Dirs;
1093            });
1094  }
1095
1096  // CodeScape IMG toolchain starting from v1.3.
1097  MultilibSet MtiMipsMultilibsV2;
1098  {
1099    auto BeHard = makeMultilib("/mips-r2-hard")
1100                      .flag("+EB")
1101                      .flag("-msoft-float")
1102                      .flag("-mnan=2008")
1103                      .flag("-muclibc");
1104    auto BeSoft = makeMultilib("/mips-r2-soft")
1105                      .flag("+EB")
1106                      .flag("+msoft-float")
1107                      .flag("-mnan=2008");
1108    auto ElHard = makeMultilib("/mipsel-r2-hard")
1109                      .flag("+EL")
1110                      .flag("-msoft-float")
1111                      .flag("-mnan=2008")
1112                      .flag("-muclibc");
1113    auto ElSoft = makeMultilib("/mipsel-r2-soft")
1114                      .flag("+EL")
1115                      .flag("+msoft-float")
1116                      .flag("-mnan=2008")
1117                      .flag("-mmicromips");
1118    auto BeHardNan = makeMultilib("/mips-r2-hard-nan2008")
1119                         .flag("+EB")
1120                         .flag("-msoft-float")
1121                         .flag("+mnan=2008")
1122                         .flag("-muclibc");
1123    auto ElHardNan = makeMultilib("/mipsel-r2-hard-nan2008")
1124                         .flag("+EL")
1125                         .flag("-msoft-float")
1126                         .flag("+mnan=2008")
1127                         .flag("-muclibc")
1128                         .flag("-mmicromips");
1129    auto BeHardNanUclibc = makeMultilib("/mips-r2-hard-nan2008-uclibc")
1130                               .flag("+EB")
1131                               .flag("-msoft-float")
1132                               .flag("+mnan=2008")
1133                               .flag("+muclibc");
1134    auto ElHardNanUclibc = makeMultilib("/mipsel-r2-hard-nan2008-uclibc")
1135                               .flag("+EL")
1136                               .flag("-msoft-float")
1137                               .flag("+mnan=2008")
1138                               .flag("+muclibc");
1139    auto BeHardUclibc = makeMultilib("/mips-r2-hard-uclibc")
1140                            .flag("+EB")
1141                            .flag("-msoft-float")
1142                            .flag("-mnan=2008")
1143                            .flag("+muclibc");
1144    auto ElHardUclibc = makeMultilib("/mipsel-r2-hard-uclibc")
1145                            .flag("+EL")
1146                            .flag("-msoft-float")
1147                            .flag("-mnan=2008")
1148                            .flag("+muclibc");
1149    auto ElMicroHardNan = makeMultilib("/micromipsel-r2-hard-nan2008")
1150                              .flag("+EL")
1151                              .flag("-msoft-float")
1152                              .flag("+mnan=2008")
1153                              .flag("+mmicromips");
1154    auto ElMicroSoft = makeMultilib("/micromipsel-r2-soft")
1155                           .flag("+EL")
1156                           .flag("+msoft-float")
1157                           .flag("-mnan=2008")
1158                           .flag("+mmicromips");
1159
1160    auto O32 =
1161        makeMultilib("/lib").osSuffix("").flag("-mabi=n32").flag("-mabi=n64");
1162    auto N32 =
1163        makeMultilib("/lib32").osSuffix("").flag("+mabi=n32").flag("-mabi=n64");
1164    auto N64 =
1165        makeMultilib("/lib64").osSuffix("").flag("-mabi=n32").flag("+mabi=n64");
1166
1167    MtiMipsMultilibsV2 =
1168        MultilibSet()
1169            .Either({BeHard, BeSoft, ElHard, ElSoft, BeHardNan, ElHardNan,
1170                     BeHardNanUclibc, ElHardNanUclibc, BeHardUclibc,
1171                     ElHardUclibc, ElMicroHardNan, ElMicroSoft})
1172            .Either(O32, N32, N64)
1173            .FilterOut(NonExistent)
1174            .setIncludeDirsCallback([](const Multilib &M) {
1175              return std::vector<std::string>({"/../../../../sysroot" +
1176                                               M.includeSuffix() +
1177                                               "/../usr/include"});
1178            })
1179            .setFilePathsCallback([](const Multilib &M) {
1180              return std::vector<std::string>(
1181                  {"/../../../../mips-mti-linux-gnu/lib" + M.gccSuffix()});
1182            });
1183  }
1184  for (auto Candidate : {&MtiMipsMultilibsV1, &MtiMipsMultilibsV2}) {
1185    if (Candidate->select(Flags, Result.SelectedMultilib)) {
1186      Result.Multilibs = *Candidate;
1187      return true;
1188    }
1189  }
1190  return false;
1191}
1192
1193static bool findMipsImgMultilibs(const Multilib::flags_list &Flags,
1194                                 FilterNonExistent &NonExistent,
1195                                 DetectedMultilibs &Result) {
1196  // CodeScape IMG toolchain v1.2 and early.
1197  MultilibSet ImgMultilibsV1;
1198  {
1199    auto Mips64r6 = makeMultilib("/mips64r6").flag("+m64").flag("-m32");
1200
1201    auto LittleEndian = makeMultilib("/el").flag("+EL").flag("-EB");
1202
1203    auto MAbi64 =
1204        makeMultilib("/64").flag("+mabi=n64").flag("-mabi=n32").flag("-m32");
1205
1206    ImgMultilibsV1 =
1207        MultilibSet()
1208            .Maybe(Mips64r6)
1209            .Maybe(MAbi64)
1210            .Maybe(LittleEndian)
1211            .FilterOut(NonExistent)
1212            .setIncludeDirsCallback([](const Multilib &M) {
1213              return std::vector<std::string>(
1214                  {"/include", "/../../../../sysroot/usr/include"});
1215            });
1216  }
1217
1218  // CodeScape IMG toolchain starting from v1.3.
1219  MultilibSet ImgMultilibsV2;
1220  {
1221    auto BeHard = makeMultilib("/mips-r6-hard")
1222                      .flag("+EB")
1223                      .flag("-msoft-float")
1224                      .flag("-mmicromips");
1225    auto BeSoft = makeMultilib("/mips-r6-soft")
1226                      .flag("+EB")
1227                      .flag("+msoft-float")
1228                      .flag("-mmicromips");
1229    auto ElHard = makeMultilib("/mipsel-r6-hard")
1230                      .flag("+EL")
1231                      .flag("-msoft-float")
1232                      .flag("-mmicromips");
1233    auto ElSoft = makeMultilib("/mipsel-r6-soft")
1234                      .flag("+EL")
1235                      .flag("+msoft-float")
1236                      .flag("-mmicromips");
1237    auto BeMicroHard = makeMultilib("/micromips-r6-hard")
1238                           .flag("+EB")
1239                           .flag("-msoft-float")
1240                           .flag("+mmicromips");
1241    auto BeMicroSoft = makeMultilib("/micromips-r6-soft")
1242                           .flag("+EB")
1243                           .flag("+msoft-float")
1244                           .flag("+mmicromips");
1245    auto ElMicroHard = makeMultilib("/micromipsel-r6-hard")
1246                           .flag("+EL")
1247                           .flag("-msoft-float")
1248                           .flag("+mmicromips");
1249    auto ElMicroSoft = makeMultilib("/micromipsel-r6-soft")
1250                           .flag("+EL")
1251                           .flag("+msoft-float")
1252                           .flag("+mmicromips");
1253
1254    auto O32 =
1255        makeMultilib("/lib").osSuffix("").flag("-mabi=n32").flag("-mabi=n64");
1256    auto N32 =
1257        makeMultilib("/lib32").osSuffix("").flag("+mabi=n32").flag("-mabi=n64");
1258    auto N64 =
1259        makeMultilib("/lib64").osSuffix("").flag("-mabi=n32").flag("+mabi=n64");
1260
1261    ImgMultilibsV2 =
1262        MultilibSet()
1263            .Either({BeHard, BeSoft, ElHard, ElSoft, BeMicroHard, BeMicroSoft,
1264                     ElMicroHard, ElMicroSoft})
1265            .Either(O32, N32, N64)
1266            .FilterOut(NonExistent)
1267            .setIncludeDirsCallback([](const Multilib &M) {
1268              return std::vector<std::string>({"/../../../../sysroot" +
1269                                               M.includeSuffix() +
1270                                               "/../usr/include"});
1271            })
1272            .setFilePathsCallback([](const Multilib &M) {
1273              return std::vector<std::string>(
1274                  {"/../../../../mips-img-linux-gnu/lib" + M.gccSuffix()});
1275            });
1276  }
1277  for (auto Candidate : {&ImgMultilibsV1, &ImgMultilibsV2}) {
1278    if (Candidate->select(Flags, Result.SelectedMultilib)) {
1279      Result.Multilibs = *Candidate;
1280      return true;
1281    }
1282  }
1283  return false;
1284}
1285
1286bool clang::driver::findMIPSMultilibs(const Driver &D,
1287                                      const llvm::Triple &TargetTriple,
1288                                      StringRef Path, const ArgList &Args,
1289                                      DetectedMultilibs &Result) {
1290  FilterNonExistent NonExistent(Path, "/crtbegin.o", D.getVFS());
1291
1292  StringRef CPUName;
1293  StringRef ABIName;
1294  tools::mips::getMipsCPUAndABI(Args, TargetTriple, CPUName, ABIName);
1295
1296  llvm::Triple::ArchType TargetArch = TargetTriple.getArch();
1297
1298  Multilib::flags_list Flags;
1299  addMultilibFlag(TargetTriple.isMIPS32(), "m32", Flags);
1300  addMultilibFlag(TargetTriple.isMIPS64(), "m64", Flags);
1301  addMultilibFlag(isMips16(Args), "mips16", Flags);
1302  addMultilibFlag(CPUName == "mips32", "march=mips32", Flags);
1303  addMultilibFlag(CPUName == "mips32r2" || CPUName == "mips32r3" ||
1304                      CPUName == "mips32r5" || CPUName == "p5600",
1305                  "march=mips32r2", Flags);
1306  addMultilibFlag(CPUName == "mips32r6", "march=mips32r6", Flags);
1307  addMultilibFlag(CPUName == "mips64", "march=mips64", Flags);
1308  addMultilibFlag(CPUName == "mips64r2" || CPUName == "mips64r3" ||
1309                      CPUName == "mips64r5" || CPUName == "octeon",
1310                  "march=mips64r2", Flags);
1311  addMultilibFlag(CPUName == "mips64r6", "march=mips64r6", Flags);
1312  addMultilibFlag(isMicroMips(Args), "mmicromips", Flags);
1313  addMultilibFlag(tools::mips::isUCLibc(Args), "muclibc", Flags);
1314  addMultilibFlag(tools::mips::isNaN2008(Args, TargetTriple), "mnan=2008",
1315                  Flags);
1316  addMultilibFlag(ABIName == "n32", "mabi=n32", Flags);
1317  addMultilibFlag(ABIName == "n64", "mabi=n64", Flags);
1318  addMultilibFlag(isSoftFloatABI(Args), "msoft-float", Flags);
1319  addMultilibFlag(!isSoftFloatABI(Args), "mhard-float", Flags);
1320  addMultilibFlag(isMipsEL(TargetArch), "EL", Flags);
1321  addMultilibFlag(!isMipsEL(TargetArch), "EB", Flags);
1322
1323  if (TargetTriple.isAndroid())
1324    return findMipsAndroidMultilibs(D.getVFS(), Path, Flags, NonExistent,
1325                                    Result);
1326
1327  if (TargetTriple.getVendor() == llvm::Triple::MipsTechnologies &&
1328      TargetTriple.getOS() == llvm::Triple::Linux &&
1329      TargetTriple.getEnvironment() == llvm::Triple::UnknownEnvironment)
1330    return findMipsMuslMultilibs(Flags, NonExistent, Result);
1331
1332  if (TargetTriple.getVendor() == llvm::Triple::MipsTechnologies &&
1333      TargetTriple.getOS() == llvm::Triple::Linux &&
1334      TargetTriple.isGNUEnvironment())
1335    return findMipsMtiMultilibs(Flags, NonExistent, Result);
1336
1337  if (TargetTriple.getVendor() == llvm::Triple::ImaginationTechnologies &&
1338      TargetTriple.getOS() == llvm::Triple::Linux &&
1339      TargetTriple.isGNUEnvironment())
1340    return findMipsImgMultilibs(Flags, NonExistent, Result);
1341
1342  if (findMipsCsMultilibs(Flags, NonExistent, Result))
1343    return true;
1344
1345  // Fallback to the regular toolchain-tree structure.
1346  Multilib Default;
1347  Result.Multilibs.push_back(Default);
1348  Result.Multilibs.FilterOut(NonExistent);
1349
1350  if (Result.Multilibs.select(Flags, Result.SelectedMultilib)) {
1351    Result.BiarchSibling = Multilib();
1352    return true;
1353  }
1354
1355  return false;
1356}
1357
1358static void findAndroidArmMultilibs(const Driver &D,
1359                                    const llvm::Triple &TargetTriple,
1360                                    StringRef Path, const ArgList &Args,
1361                                    DetectedMultilibs &Result) {
1362  // Find multilibs with subdirectories like armv7-a, thumb, armv7-a/thumb.
1363  FilterNonExistent NonExistent(Path, "/crtbegin.o", D.getVFS());
1364  Multilib ArmV7Multilib = makeMultilib("/armv7-a")
1365                               .flag("+march=armv7-a")
1366                               .flag("-mthumb");
1367  Multilib ThumbMultilib = makeMultilib("/thumb")
1368                               .flag("-march=armv7-a")
1369                               .flag("+mthumb");
1370  Multilib ArmV7ThumbMultilib = makeMultilib("/armv7-a/thumb")
1371                               .flag("+march=armv7-a")
1372                               .flag("+mthumb");
1373  Multilib DefaultMultilib = makeMultilib("")
1374                               .flag("-march=armv7-a")
1375                               .flag("-mthumb");
1376  MultilibSet AndroidArmMultilibs =
1377      MultilibSet()
1378          .Either(ThumbMultilib, ArmV7Multilib,
1379                  ArmV7ThumbMultilib, DefaultMultilib)
1380          .FilterOut(NonExistent);
1381
1382  Multilib::flags_list Flags;
1383  llvm::StringRef Arch = Args.getLastArgValue(options::OPT_march_EQ);
1384  bool IsArmArch = TargetTriple.getArch() == llvm::Triple::arm;
1385  bool IsThumbArch = TargetTriple.getArch() == llvm::Triple::thumb;
1386  bool IsV7SubArch = TargetTriple.getSubArch() == llvm::Triple::ARMSubArch_v7;
1387  bool IsThumbMode = IsThumbArch ||
1388      Args.hasFlag(options::OPT_mthumb, options::OPT_mno_thumb, false) ||
1389      (IsArmArch && llvm::ARM::parseArchISA(Arch) == llvm::ARM::ISAKind::THUMB);
1390  bool IsArmV7Mode = (IsArmArch || IsThumbArch) &&
1391      (llvm::ARM::parseArchVersion(Arch) == 7 ||
1392       (IsArmArch && Arch == "" && IsV7SubArch));
1393  addMultilibFlag(IsArmV7Mode, "march=armv7-a", Flags);
1394  addMultilibFlag(IsThumbMode, "mthumb", Flags);
1395
1396  if (AndroidArmMultilibs.select(Flags, Result.SelectedMultilib))
1397    Result.Multilibs = AndroidArmMultilibs;
1398}
1399
1400static void findRISCVMultilibs(const Driver &D,
1401                               const llvm::Triple &TargetTriple, StringRef Path,
1402                               const ArgList &Args, DetectedMultilibs &Result) {
1403
1404  FilterNonExistent NonExistent(Path, "/crtbegin.o", D.getVFS());
1405  Multilib Ilp32 = makeMultilib("lib32/ilp32").flag("+m32").flag("+mabi=ilp32");
1406  Multilib Ilp32f =
1407      makeMultilib("lib32/ilp32f").flag("+m32").flag("+mabi=ilp32f");
1408  Multilib Ilp32d =
1409      makeMultilib("lib32/ilp32d").flag("+m32").flag("+mabi=ilp32d");
1410  Multilib Lp64 = makeMultilib("lib64/lp64").flag("+m64").flag("+mabi=lp64");
1411  Multilib Lp64f = makeMultilib("lib64/lp64f").flag("+m64").flag("+mabi=lp64f");
1412  Multilib Lp64d = makeMultilib("lib64/lp64d").flag("+m64").flag("+mabi=lp64d");
1413  MultilibSet RISCVMultilibs =
1414      MultilibSet()
1415          .Either({Ilp32, Ilp32f, Ilp32d, Lp64, Lp64f, Lp64d})
1416          .FilterOut(NonExistent);
1417
1418  Multilib::flags_list Flags;
1419  bool IsRV64 = TargetTriple.getArch() == llvm::Triple::riscv64;
1420  StringRef ABIName = tools::riscv::getRISCVABI(Args, TargetTriple);
1421
1422  addMultilibFlag(!IsRV64, "m32", Flags);
1423  addMultilibFlag(IsRV64, "m64", Flags);
1424  addMultilibFlag(ABIName == "ilp32", "mabi=ilp32", Flags);
1425  addMultilibFlag(ABIName == "ilp32f", "mabi=ilp32f", Flags);
1426  addMultilibFlag(ABIName == "ilp32d", "mabi=ilp32d", Flags);
1427  addMultilibFlag(ABIName == "lp64", "mabi=lp64", Flags);
1428  addMultilibFlag(ABIName == "lp64f", "mabi=lp64f", Flags);
1429  addMultilibFlag(ABIName == "lp64d", "mabi=lp64d", Flags);
1430
1431  if (RISCVMultilibs.select(Flags, Result.SelectedMultilib))
1432    Result.Multilibs = RISCVMultilibs;
1433}
1434
1435static bool findBiarchMultilibs(const Driver &D,
1436                                const llvm::Triple &TargetTriple,
1437                                StringRef Path, const ArgList &Args,
1438                                bool NeedsBiarchSuffix,
1439                                DetectedMultilibs &Result) {
1440  Multilib Default;
1441
1442  // Some versions of SUSE and Fedora on ppc64 put 32-bit libs
1443  // in what would normally be GCCInstallPath and put the 64-bit
1444  // libs in a subdirectory named 64. The simple logic we follow is that
1445  // *if* there is a subdirectory of the right name with crtbegin.o in it,
1446  // we use that. If not, and if not a biarch triple alias, we look for
1447  // crtbegin.o without the subdirectory.
1448
1449  StringRef Suff64 = "/64";
1450  // Solaris uses platform-specific suffixes instead of /64.
1451  if (TargetTriple.getOS() == llvm::Triple::Solaris) {
1452    switch (TargetTriple.getArch()) {
1453    case llvm::Triple::x86:
1454    case llvm::Triple::x86_64:
1455      Suff64 = "/amd64";
1456      break;
1457    case llvm::Triple::sparc:
1458    case llvm::Triple::sparcv9:
1459      Suff64 = "/sparcv9";
1460      break;
1461    default:
1462      break;
1463    }
1464  }
1465
1466  Multilib Alt64 = Multilib()
1467                       .gccSuffix(Suff64)
1468                       .includeSuffix(Suff64)
1469                       .flag("-m32")
1470                       .flag("+m64")
1471                       .flag("-mx32");
1472  Multilib Alt32 = Multilib()
1473                       .gccSuffix("/32")
1474                       .includeSuffix("/32")
1475                       .flag("+m32")
1476                       .flag("-m64")
1477                       .flag("-mx32");
1478  Multilib Altx32 = Multilib()
1479                        .gccSuffix("/x32")
1480                        .includeSuffix("/x32")
1481                        .flag("-m32")
1482                        .flag("-m64")
1483                        .flag("+mx32");
1484
1485  // GCC toolchain for IAMCU doesn't have crtbegin.o, so look for libgcc.a.
1486  FilterNonExistent NonExistent(
1487      Path, TargetTriple.isOSIAMCU() ? "/libgcc.a" : "/crtbegin.o", D.getVFS());
1488
1489  // Determine default multilib from: 32, 64, x32
1490  // Also handle cases such as 64 on 32, 32 on 64, etc.
1491  enum { UNKNOWN, WANT32, WANT64, WANTX32 } Want = UNKNOWN;
1492  const bool IsX32 = TargetTriple.getEnvironment() == llvm::Triple::GNUX32;
1493  if (TargetTriple.isArch32Bit() && !NonExistent(Alt32))
1494    Want = WANT64;
1495  else if (TargetTriple.isArch64Bit() && IsX32 && !NonExistent(Altx32))
1496    Want = WANT64;
1497  else if (TargetTriple.isArch64Bit() && !IsX32 && !NonExistent(Alt64))
1498    Want = WANT32;
1499  else {
1500    if (TargetTriple.isArch32Bit())
1501      Want = NeedsBiarchSuffix ? WANT64 : WANT32;
1502    else if (IsX32)
1503      Want = NeedsBiarchSuffix ? WANT64 : WANTX32;
1504    else
1505      Want = NeedsBiarchSuffix ? WANT32 : WANT64;
1506  }
1507
1508  if (Want == WANT32)
1509    Default.flag("+m32").flag("-m64").flag("-mx32");
1510  else if (Want == WANT64)
1511    Default.flag("-m32").flag("+m64").flag("-mx32");
1512  else if (Want == WANTX32)
1513    Default.flag("-m32").flag("-m64").flag("+mx32");
1514  else
1515    return false;
1516
1517  Result.Multilibs.push_back(Default);
1518  Result.Multilibs.push_back(Alt64);
1519  Result.Multilibs.push_back(Alt32);
1520  Result.Multilibs.push_back(Altx32);
1521
1522  Result.Multilibs.FilterOut(NonExistent);
1523
1524  Multilib::flags_list Flags;
1525  addMultilibFlag(TargetTriple.isArch64Bit() && !IsX32, "m64", Flags);
1526  addMultilibFlag(TargetTriple.isArch32Bit(), "m32", Flags);
1527  addMultilibFlag(TargetTriple.isArch64Bit() && IsX32, "mx32", Flags);
1528
1529  if (!Result.Multilibs.select(Flags, Result.SelectedMultilib))
1530    return false;
1531
1532  if (Result.SelectedMultilib == Alt64 || Result.SelectedMultilib == Alt32 ||
1533      Result.SelectedMultilib == Altx32)
1534    Result.BiarchSibling = Default;
1535
1536  return true;
1537}
1538
1539/// Generic_GCC - A tool chain using the 'gcc' command to perform
1540/// all subcommands; this relies on gcc translating the majority of
1541/// command line options.
1542
1543/// Less-than for GCCVersion, implementing a Strict Weak Ordering.
1544bool Generic_GCC::GCCVersion::isOlderThan(int RHSMajor, int RHSMinor,
1545                                          int RHSPatch,
1546                                          StringRef RHSPatchSuffix) const {
1547  if (Major != RHSMajor)
1548    return Major < RHSMajor;
1549  if (Minor != RHSMinor)
1550    return Minor < RHSMinor;
1551  if (Patch != RHSPatch) {
1552    // Note that versions without a specified patch sort higher than those with
1553    // a patch.
1554    if (RHSPatch == -1)
1555      return true;
1556    if (Patch == -1)
1557      return false;
1558
1559    // Otherwise just sort on the patch itself.
1560    return Patch < RHSPatch;
1561  }
1562  if (PatchSuffix != RHSPatchSuffix) {
1563    // Sort empty suffixes higher.
1564    if (RHSPatchSuffix.empty())
1565      return true;
1566    if (PatchSuffix.empty())
1567      return false;
1568
1569    // Provide a lexicographic sort to make this a total ordering.
1570    return PatchSuffix < RHSPatchSuffix;
1571  }
1572
1573  // The versions are equal.
1574  return false;
1575}
1576
1577/// Parse a GCCVersion object out of a string of text.
1578///
1579/// This is the primary means of forming GCCVersion objects.
1580/*static*/
1581Generic_GCC::GCCVersion Generic_GCC::GCCVersion::Parse(StringRef VersionText) {
1582  const GCCVersion BadVersion = {VersionText.str(), -1, -1, -1, "", "", ""};
1583  std::pair<StringRef, StringRef> First = VersionText.split('.');
1584  std::pair<StringRef, StringRef> Second = First.second.split('.');
1585
1586  GCCVersion GoodVersion = {VersionText.str(), -1, -1, -1, "", "", ""};
1587  if (First.first.getAsInteger(10, GoodVersion.Major) || GoodVersion.Major < 0)
1588    return BadVersion;
1589  GoodVersion.MajorStr = First.first.str();
1590  if (First.second.empty())
1591    return GoodVersion;
1592  StringRef MinorStr = Second.first;
1593  if (Second.second.empty()) {
1594    if (size_t EndNumber = MinorStr.find_first_not_of("0123456789")) {
1595      GoodVersion.PatchSuffix = MinorStr.substr(EndNumber);
1596      MinorStr = MinorStr.slice(0, EndNumber);
1597    }
1598  }
1599  if (MinorStr.getAsInteger(10, GoodVersion.Minor) || GoodVersion.Minor < 0)
1600    return BadVersion;
1601  GoodVersion.MinorStr = MinorStr.str();
1602
1603  // First look for a number prefix and parse that if present. Otherwise just
1604  // stash the entire patch string in the suffix, and leave the number
1605  // unspecified. This covers versions strings such as:
1606  //   5        (handled above)
1607  //   4.4
1608  //   4.4-patched
1609  //   4.4.0
1610  //   4.4.x
1611  //   4.4.2-rc4
1612  //   4.4.x-patched
1613  // And retains any patch number it finds.
1614  StringRef PatchText = Second.second;
1615  if (!PatchText.empty()) {
1616    if (size_t EndNumber = PatchText.find_first_not_of("0123456789")) {
1617      // Try to parse the number and any suffix.
1618      if (PatchText.slice(0, EndNumber).getAsInteger(10, GoodVersion.Patch) ||
1619          GoodVersion.Patch < 0)
1620        return BadVersion;
1621      GoodVersion.PatchSuffix = PatchText.substr(EndNumber);
1622    }
1623  }
1624
1625  return GoodVersion;
1626}
1627
1628static llvm::StringRef getGCCToolchainDir(const ArgList &Args) {
1629  const Arg *A = Args.getLastArg(clang::driver::options::OPT_gcc_toolchain);
1630  if (A)
1631    return A->getValue();
1632  return GCC_INSTALL_PREFIX;
1633}
1634
1635/// Initialize a GCCInstallationDetector from the driver.
1636///
1637/// This performs all of the autodetection and sets up the various paths.
1638/// Once constructed, a GCCInstallationDetector is essentially immutable.
1639///
1640/// FIXME: We shouldn't need an explicit TargetTriple parameter here, and
1641/// should instead pull the target out of the driver. This is currently
1642/// necessary because the driver doesn't store the final version of the target
1643/// triple.
1644void Generic_GCC::GCCInstallationDetector::init(
1645    const llvm::Triple &TargetTriple, const ArgList &Args,
1646    ArrayRef<std::string> ExtraTripleAliases) {
1647  llvm::Triple BiarchVariantTriple = TargetTriple.isArch32Bit()
1648                                         ? TargetTriple.get64BitArchVariant()
1649                                         : TargetTriple.get32BitArchVariant();
1650  // The library directories which may contain GCC installations.
1651  SmallVector<StringRef, 4> CandidateLibDirs, CandidateBiarchLibDirs;
1652  // The compatible GCC triples for this particular architecture.
1653  SmallVector<StringRef, 16> CandidateTripleAliases;
1654  SmallVector<StringRef, 16> CandidateBiarchTripleAliases;
1655  CollectLibDirsAndTriples(TargetTriple, BiarchVariantTriple, CandidateLibDirs,
1656                           CandidateTripleAliases, CandidateBiarchLibDirs,
1657                           CandidateBiarchTripleAliases);
1658
1659  // Compute the set of prefixes for our search.
1660  SmallVector<std::string, 8> Prefixes(D.PrefixDirs.begin(),
1661                                       D.PrefixDirs.end());
1662
1663  StringRef GCCToolchainDir = getGCCToolchainDir(Args);
1664  if (GCCToolchainDir != "") {
1665    if (GCCToolchainDir.back() == '/')
1666      GCCToolchainDir = GCCToolchainDir.drop_back(); // remove the /
1667
1668    Prefixes.push_back(GCCToolchainDir);
1669  } else {
1670    // If we have a SysRoot, try that first.
1671    if (!D.SysRoot.empty()) {
1672      Prefixes.push_back(D.SysRoot);
1673      AddDefaultGCCPrefixes(TargetTriple, Prefixes, D.SysRoot);
1674    }
1675
1676    // Then look for gcc installed alongside clang.
1677    Prefixes.push_back(D.InstalledDir + "/..");
1678
1679    // Next, look for prefix(es) that correspond to distribution-supplied gcc
1680    // installations.
1681    if (D.SysRoot.empty()) {
1682      // Typically /usr.
1683      AddDefaultGCCPrefixes(TargetTriple, Prefixes, D.SysRoot);
1684    }
1685  }
1686
1687  // Try to respect gcc-config on Gentoo. However, do that only
1688  // if --gcc-toolchain is not provided or equal to the Gentoo install
1689  // in /usr. This avoids accidentally enforcing the system GCC version
1690  // when using a custom toolchain.
1691  if (GCCToolchainDir == "" || GCCToolchainDir == D.SysRoot + "/usr") {
1692    SmallVector<StringRef, 16> GentooTestTriples;
1693    // Try to match an exact triple as target triple first.
1694    // e.g. crossdev -S x86_64-gentoo-linux-gnu will install gcc libs for
1695    // x86_64-gentoo-linux-gnu. But "clang -target x86_64-gentoo-linux-gnu"
1696    // may pick the libraries for x86_64-pc-linux-gnu even when exact matching
1697    // triple x86_64-gentoo-linux-gnu is present.
1698    GentooTestTriples.push_back(TargetTriple.str());
1699    // Check rest of triples.
1700    GentooTestTriples.append(ExtraTripleAliases.begin(),
1701                             ExtraTripleAliases.end());
1702    GentooTestTriples.append(CandidateTripleAliases.begin(),
1703                             CandidateTripleAliases.end());
1704    if (ScanGentooConfigs(TargetTriple, Args, GentooTestTriples,
1705                          CandidateBiarchTripleAliases))
1706      return;
1707  }
1708
1709  // Loop over the various components which exist and select the best GCC
1710  // installation available. GCC installs are ranked by version number.
1711  Version = GCCVersion::Parse("0.0.0");
1712  for (const std::string &Prefix : Prefixes) {
1713    if (!D.getVFS().exists(Prefix))
1714      continue;
1715    for (StringRef Suffix : CandidateLibDirs) {
1716      const std::string LibDir = Prefix + Suffix.str();
1717      if (!D.getVFS().exists(LibDir))
1718        continue;
1719      // Try to match the exact target triple first.
1720      ScanLibDirForGCCTriple(TargetTriple, Args, LibDir, TargetTriple.str());
1721      // Try rest of possible triples.
1722      for (StringRef Candidate : ExtraTripleAliases) // Try these first.
1723        ScanLibDirForGCCTriple(TargetTriple, Args, LibDir, Candidate);
1724      for (StringRef Candidate : CandidateTripleAliases)
1725        ScanLibDirForGCCTriple(TargetTriple, Args, LibDir, Candidate);
1726    }
1727    for (StringRef Suffix : CandidateBiarchLibDirs) {
1728      const std::string LibDir = Prefix + Suffix.str();
1729      if (!D.getVFS().exists(LibDir))
1730        continue;
1731      for (StringRef Candidate : CandidateBiarchTripleAliases)
1732        ScanLibDirForGCCTriple(TargetTriple, Args, LibDir, Candidate,
1733                               /*NeedsBiarchSuffix=*/ true);
1734    }
1735  }
1736}
1737
1738void Generic_GCC::GCCInstallationDetector::print(raw_ostream &OS) const {
1739  for (const auto &InstallPath : CandidateGCCInstallPaths)
1740    OS << "Found candidate GCC installation: " << InstallPath << "\n";
1741
1742  if (!GCCInstallPath.empty())
1743    OS << "Selected GCC installation: " << GCCInstallPath << "\n";
1744
1745  for (const auto &Multilib : Multilibs)
1746    OS << "Candidate multilib: " << Multilib << "\n";
1747
1748  if (Multilibs.size() != 0 || !SelectedMultilib.isDefault())
1749    OS << "Selected multilib: " << SelectedMultilib << "\n";
1750}
1751
1752bool Generic_GCC::GCCInstallationDetector::getBiarchSibling(Multilib &M) const {
1753  if (BiarchSibling.hasValue()) {
1754    M = BiarchSibling.getValue();
1755    return true;
1756  }
1757  return false;
1758}
1759
1760void Generic_GCC::GCCInstallationDetector::AddDefaultGCCPrefixes(
1761    const llvm::Triple &TargetTriple, SmallVectorImpl<std::string> &Prefixes,
1762    StringRef SysRoot) {
1763  if (TargetTriple.getOS() == llvm::Triple::Solaris) {
1764    // Solaris is a special case.
1765    // The GCC installation is under
1766    //   /usr/gcc/<major>.<minor>/lib/gcc/<triple>/<major>.<minor>.<patch>/
1767    // so we need to find those /usr/gcc/*/lib/gcc libdirs and go with
1768    // /usr/gcc/<version> as a prefix.
1769
1770    std::string PrefixDir = SysRoot.str() + "/usr/gcc";
1771    std::error_code EC;
1772    for (vfs::directory_iterator LI = D.getVFS().dir_begin(PrefixDir, EC), LE;
1773         !EC && LI != LE; LI = LI.increment(EC)) {
1774      StringRef VersionText = llvm::sys::path::filename(LI->getName());
1775      GCCVersion CandidateVersion = GCCVersion::Parse(VersionText);
1776
1777      // Filter out obviously bad entries.
1778      if (CandidateVersion.Major == -1 || CandidateVersion.isOlderThan(4, 1, 1))
1779        continue;
1780
1781      std::string CandidatePrefix = PrefixDir + "/" + VersionText.str();
1782      std::string CandidateLibPath = CandidatePrefix + "/lib/gcc";
1783      if (!D.getVFS().exists(CandidateLibPath))
1784        continue;
1785
1786      Prefixes.push_back(CandidatePrefix);
1787    }
1788    return;
1789  }
1790
1791  // Non-Solaris is much simpler - most systems just go with "/usr".
1792  if (SysRoot.empty() && TargetTriple.getOS() == llvm::Triple::Linux) {
1793    // Yet, still look for RHEL devtoolsets.
1794    Prefixes.push_back("/opt/rh/devtoolset-7/root/usr");
1795    Prefixes.push_back("/opt/rh/devtoolset-6/root/usr");
1796    Prefixes.push_back("/opt/rh/devtoolset-4/root/usr");
1797    Prefixes.push_back("/opt/rh/devtoolset-3/root/usr");
1798    Prefixes.push_back("/opt/rh/devtoolset-2/root/usr");
1799  }
1800  Prefixes.push_back(SysRoot.str() + "/usr");
1801}
1802
1803/*static*/ void Generic_GCC::GCCInstallationDetector::CollectLibDirsAndTriples(
1804    const llvm::Triple &TargetTriple, const llvm::Triple &BiarchTriple,
1805    SmallVectorImpl<StringRef> &LibDirs,
1806    SmallVectorImpl<StringRef> &TripleAliases,
1807    SmallVectorImpl<StringRef> &BiarchLibDirs,
1808    SmallVectorImpl<StringRef> &BiarchTripleAliases) {
1809  // Declare a bunch of static data sets that we'll select between below. These
1810  // are specifically designed to always refer to string literals to avoid any
1811  // lifetime or initialization issues.
1812  static const char *const AArch64LibDirs[] = {"/lib64", "/lib"};
1813  static const char *const AArch64Triples[] = {
1814      "aarch64-none-linux-gnu", "aarch64-linux-gnu", "aarch64-redhat-linux",
1815      "aarch64-suse-linux"};
1816  static const char *const AArch64beLibDirs[] = {"/lib"};
1817  static const char *const AArch64beTriples[] = {"aarch64_be-none-linux-gnu",
1818                                                 "aarch64_be-linux-gnu"};
1819
1820  static const char *const ARMLibDirs[] = {"/lib"};
1821  static const char *const ARMTriples[] = {"arm-linux-gnueabi"};
1822  static const char *const ARMHFTriples[] = {"arm-linux-gnueabihf",
1823                                             "armv7hl-redhat-linux-gnueabi",
1824                                             "armv6hl-suse-linux-gnueabi",
1825                                             "armv7hl-suse-linux-gnueabi"};
1826  static const char *const ARMebLibDirs[] = {"/lib"};
1827  static const char *const ARMebTriples[] = {"armeb-linux-gnueabi"};
1828  static const char *const ARMebHFTriples[] = {
1829      "armeb-linux-gnueabihf", "armebv7hl-redhat-linux-gnueabi"};
1830
1831  static const char *const X86_64LibDirs[] = {"/lib64", "/lib"};
1832  static const char *const X86_64Triples[] = {
1833      "x86_64-linux-gnu",       "x86_64-unknown-linux-gnu",
1834      "x86_64-pc-linux-gnu",    "x86_64-redhat-linux6E",
1835      "x86_64-redhat-linux",    "x86_64-suse-linux",
1836      "x86_64-manbo-linux-gnu", "x86_64-linux-gnu",
1837      "x86_64-slackware-linux", "x86_64-unknown-linux",
1838      "x86_64-amazon-linux"};
1839  static const char *const X32LibDirs[] = {"/libx32"};
1840  static const char *const X86LibDirs[] = {"/lib32", "/lib"};
1841  static const char *const X86Triples[] = {
1842      "i686-linux-gnu",       "i686-pc-linux-gnu",     "i486-linux-gnu",
1843      "i386-linux-gnu",       "i386-redhat-linux6E",   "i686-redhat-linux",
1844      "i586-redhat-linux",    "i386-redhat-linux",     "i586-suse-linux",
1845      "i486-slackware-linux", "i686-montavista-linux", "i586-linux-gnu"};
1846
1847  static const char *const MIPSLibDirs[] = {"/lib"};
1848  static const char *const MIPSTriples[] = {"mips-linux-gnu", "mips-mti-linux",
1849                                            "mips-mti-linux-gnu",
1850                                            "mips-img-linux-gnu"};
1851  static const char *const MIPSELLibDirs[] = {"/lib"};
1852  static const char *const MIPSELTriples[] = {"mipsel-linux-gnu",
1853                                              "mips-img-linux-gnu"};
1854
1855  static const char *const MIPS64LibDirs[] = {"/lib64", "/lib"};
1856  static const char *const MIPS64Triples[] = {
1857      "mips64-linux-gnu", "mips-mti-linux-gnu", "mips-img-linux-gnu",
1858      "mips64-linux-gnuabi64"};
1859  static const char *const MIPS64ELLibDirs[] = {"/lib64", "/lib"};
1860  static const char *const MIPS64ELTriples[] = {
1861      "mips64el-linux-gnu", "mips-mti-linux-gnu", "mips-img-linux-gnu",
1862      "mips64el-linux-gnuabi64"};
1863
1864
1865  static const char *const PPCLibDirs[] = {"/lib32", "/lib"};
1866  static const char *const PPCTriples[] = {
1867      "powerpc-linux-gnu", "powerpc-unknown-linux-gnu", "powerpc-linux-gnuspe",
1868      "powerpc-suse-linux", "powerpc-montavista-linuxspe"};
1869  static const char *const PPC64LibDirs[] = {"/lib64", "/lib"};
1870  static const char *const PPC64Triples[] = {
1871      "powerpc64-linux-gnu", "powerpc64-unknown-linux-gnu",
1872      "powerpc64-suse-linux", "ppc64-redhat-linux"};
1873  static const char *const PPC64LELibDirs[] = {"/lib64", "/lib"};
1874  static const char *const PPC64LETriples[] = {
1875      "powerpc64le-linux-gnu", "powerpc64le-unknown-linux-gnu",
1876      "powerpc64le-suse-linux", "ppc64le-redhat-linux"};
1877
1878  static const char *const RISCV32LibDirs[] = {"/lib", "/lib32"};
1879  static const char *const RISCVTriples[] = {"riscv32-unknown-linux-gnu",
1880                                             "riscv64-unknown-linux-gnu",
1881                                             "riscv32-unknown-elf"};
1882
1883  static const char *const SPARCv8LibDirs[] = {"/lib32", "/lib"};
1884  static const char *const SPARCv8Triples[] = {"sparc-linux-gnu",
1885                                               "sparcv8-linux-gnu"};
1886  static const char *const SPARCv9LibDirs[] = {"/lib64", "/lib"};
1887  static const char *const SPARCv9Triples[] = {"sparc64-linux-gnu",
1888                                               "sparcv9-linux-gnu"};
1889
1890  static const char *const SystemZLibDirs[] = {"/lib64", "/lib"};
1891  static const char *const SystemZTriples[] = {
1892      "s390x-linux-gnu", "s390x-unknown-linux-gnu", "s390x-ibm-linux-gnu",
1893      "s390x-suse-linux", "s390x-redhat-linux"};
1894
1895
1896  using std::begin;
1897  using std::end;
1898
1899  if (TargetTriple.getOS() == llvm::Triple::Solaris) {
1900    static const char *const SolarisLibDirs[] = {"/lib"};
1901    static const char *const SolarisSparcV8Triples[] = {
1902        "sparc-sun-solaris2.11", "sparc-sun-solaris2.12"};
1903    static const char *const SolarisSparcV9Triples[] = {
1904        "sparcv9-sun-solaris2.11", "sparcv9-sun-solaris2.12"};
1905    static const char *const SolarisX86Triples[] = {"i386-pc-solaris2.11",
1906                                                    "i386-pc-solaris2.12"};
1907    static const char *const SolarisX86_64Triples[] = {"x86_64-pc-solaris2.11",
1908                                                       "x86_64-pc-solaris2.12"};
1909    LibDirs.append(begin(SolarisLibDirs), end(SolarisLibDirs));
1910    BiarchLibDirs.append(begin(SolarisLibDirs), end(SolarisLibDirs));
1911    switch (TargetTriple.getArch()) {
1912    case llvm::Triple::x86:
1913      TripleAliases.append(begin(SolarisX86Triples), end(SolarisX86Triples));
1914      BiarchTripleAliases.append(begin(SolarisX86_64Triples),
1915                                 end(SolarisX86_64Triples));
1916      break;
1917    case llvm::Triple::x86_64:
1918      TripleAliases.append(begin(SolarisX86_64Triples),
1919                           end(SolarisX86_64Triples));
1920      BiarchTripleAliases.append(begin(SolarisX86Triples),
1921                                 end(SolarisX86Triples));
1922      break;
1923    case llvm::Triple::sparc:
1924      TripleAliases.append(begin(SolarisSparcV8Triples),
1925                           end(SolarisSparcV8Triples));
1926      BiarchTripleAliases.append(begin(SolarisSparcV9Triples),
1927                                 end(SolarisSparcV9Triples));
1928      break;
1929    case llvm::Triple::sparcv9:
1930      TripleAliases.append(begin(SolarisSparcV9Triples),
1931                           end(SolarisSparcV9Triples));
1932      BiarchTripleAliases.append(begin(SolarisSparcV8Triples),
1933                                 end(SolarisSparcV8Triples));
1934      break;
1935    default:
1936      break;
1937    }
1938    return;
1939  }
1940
1941  // Android targets should not use GNU/Linux tools or libraries.
1942  if (TargetTriple.isAndroid()) {
1943    static const char *const AArch64AndroidTriples[] = {
1944        "aarch64-linux-android"};
1945    static const char *const ARMAndroidTriples[] = {"arm-linux-androideabi"};
1946    static const char *const MIPSELAndroidTriples[] = {"mipsel-linux-android"};
1947    static const char *const MIPS64ELAndroidTriples[] = {
1948        "mips64el-linux-android"};
1949    static const char *const X86AndroidTriples[] = {"i686-linux-android"};
1950    static const char *const X86_64AndroidTriples[] = {"x86_64-linux-android"};
1951
1952    switch (TargetTriple.getArch()) {
1953    case llvm::Triple::aarch64:
1954      LibDirs.append(begin(AArch64LibDirs), end(AArch64LibDirs));
1955      TripleAliases.append(begin(AArch64AndroidTriples),
1956                           end(AArch64AndroidTriples));
1957      break;
1958    case llvm::Triple::arm:
1959    case llvm::Triple::thumb:
1960      LibDirs.append(begin(ARMLibDirs), end(ARMLibDirs));
1961      TripleAliases.append(begin(ARMAndroidTriples), end(ARMAndroidTriples));
1962      break;
1963    case llvm::Triple::mipsel:
1964      LibDirs.append(begin(MIPSELLibDirs), end(MIPSELLibDirs));
1965      TripleAliases.append(begin(MIPSELAndroidTriples),
1966                           end(MIPSELAndroidTriples));
1967      BiarchLibDirs.append(begin(MIPS64ELLibDirs), end(MIPS64ELLibDirs));
1968      BiarchTripleAliases.append(begin(MIPS64ELAndroidTriples),
1969                                 end(MIPS64ELAndroidTriples));
1970      break;
1971    case llvm::Triple::mips64el:
1972      LibDirs.append(begin(MIPS64ELLibDirs), end(MIPS64ELLibDirs));
1973      TripleAliases.append(begin(MIPS64ELAndroidTriples),
1974                           end(MIPS64ELAndroidTriples));
1975      BiarchLibDirs.append(begin(MIPSELLibDirs), end(MIPSELLibDirs));
1976      BiarchTripleAliases.append(begin(MIPSELAndroidTriples),
1977                                 end(MIPSELAndroidTriples));
1978      break;
1979    case llvm::Triple::x86_64:
1980      LibDirs.append(begin(X86_64LibDirs), end(X86_64LibDirs));
1981      TripleAliases.append(begin(X86_64AndroidTriples),
1982                           end(X86_64AndroidTriples));
1983      BiarchLibDirs.append(begin(X86LibDirs), end(X86LibDirs));
1984      BiarchTripleAliases.append(begin(X86AndroidTriples),
1985                                 end(X86AndroidTriples));
1986      break;
1987    case llvm::Triple::x86:
1988      LibDirs.append(begin(X86LibDirs), end(X86LibDirs));
1989      TripleAliases.append(begin(X86AndroidTriples), end(X86AndroidTriples));
1990      BiarchLibDirs.append(begin(X86_64LibDirs), end(X86_64LibDirs));
1991      BiarchTripleAliases.append(begin(X86_64AndroidTriples),
1992                                 end(X86_64AndroidTriples));
1993      break;
1994    default:
1995      break;
1996    }
1997
1998    return;
1999  }
2000
2001  switch (TargetTriple.getArch()) {
2002  case llvm::Triple::aarch64:
2003    LibDirs.append(begin(AArch64LibDirs), end(AArch64LibDirs));
2004    TripleAliases.append(begin(AArch64Triples), end(AArch64Triples));
2005    BiarchLibDirs.append(begin(AArch64LibDirs), end(AArch64LibDirs));
2006    BiarchTripleAliases.append(begin(AArch64Triples), end(AArch64Triples));
2007    break;
2008  case llvm::Triple::aarch64_be:
2009    LibDirs.append(begin(AArch64beLibDirs), end(AArch64beLibDirs));
2010    TripleAliases.append(begin(AArch64beTriples), end(AArch64beTriples));
2011    BiarchLibDirs.append(begin(AArch64beLibDirs), end(AArch64beLibDirs));
2012    BiarchTripleAliases.append(begin(AArch64beTriples), end(AArch64beTriples));
2013    break;
2014  case llvm::Triple::arm:
2015  case llvm::Triple::thumb:
2016    LibDirs.append(begin(ARMLibDirs), end(ARMLibDirs));
2017    if (TargetTriple.getEnvironment() == llvm::Triple::GNUEABIHF) {
2018      TripleAliases.append(begin(ARMHFTriples), end(ARMHFTriples));
2019    } else {
2020      TripleAliases.append(begin(ARMTriples), end(ARMTriples));
2021    }
2022    break;
2023  case llvm::Triple::armeb:
2024  case llvm::Triple::thumbeb:
2025    LibDirs.append(begin(ARMebLibDirs), end(ARMebLibDirs));
2026    if (TargetTriple.getEnvironment() == llvm::Triple::GNUEABIHF) {
2027      TripleAliases.append(begin(ARMebHFTriples), end(ARMebHFTriples));
2028    } else {
2029      TripleAliases.append(begin(ARMebTriples), end(ARMebTriples));
2030    }
2031    break;
2032  case llvm::Triple::x86_64:
2033    LibDirs.append(begin(X86_64LibDirs), end(X86_64LibDirs));
2034    TripleAliases.append(begin(X86_64Triples), end(X86_64Triples));
2035    // x32 is always available when x86_64 is available, so adding it as
2036    // secondary arch with x86_64 triples
2037    if (TargetTriple.getEnvironment() == llvm::Triple::GNUX32) {
2038      BiarchLibDirs.append(begin(X32LibDirs), end(X32LibDirs));
2039      BiarchTripleAliases.append(begin(X86_64Triples), end(X86_64Triples));
2040    } else {
2041      BiarchLibDirs.append(begin(X86LibDirs), end(X86LibDirs));
2042      BiarchTripleAliases.append(begin(X86Triples), end(X86Triples));
2043    }
2044    break;
2045  case llvm::Triple::x86:
2046    LibDirs.append(begin(X86LibDirs), end(X86LibDirs));
2047    // MCU toolchain is 32 bit only and its triple alias is TargetTriple
2048    // itself, which will be appended below.
2049    if (!TargetTriple.isOSIAMCU()) {
2050      TripleAliases.append(begin(X86Triples), end(X86Triples));
2051      BiarchLibDirs.append(begin(X86_64LibDirs), end(X86_64LibDirs));
2052      BiarchTripleAliases.append(begin(X86_64Triples), end(X86_64Triples));
2053    }
2054    break;
2055  case llvm::Triple::mips:
2056    LibDirs.append(begin(MIPSLibDirs), end(MIPSLibDirs));
2057    TripleAliases.append(begin(MIPSTriples), end(MIPSTriples));
2058    BiarchLibDirs.append(begin(MIPS64LibDirs), end(MIPS64LibDirs));
2059    BiarchTripleAliases.append(begin(MIPS64Triples), end(MIPS64Triples));
2060    break;
2061  case llvm::Triple::mipsel:
2062    LibDirs.append(begin(MIPSELLibDirs), end(MIPSELLibDirs));
2063    TripleAliases.append(begin(MIPSELTriples), end(MIPSELTriples));
2064    TripleAliases.append(begin(MIPSTriples), end(MIPSTriples));
2065    BiarchLibDirs.append(begin(MIPS64ELLibDirs), end(MIPS64ELLibDirs));
2066    BiarchTripleAliases.append(begin(MIPS64ELTriples), end(MIPS64ELTriples));
2067    break;
2068  case llvm::Triple::mips64:
2069    LibDirs.append(begin(MIPS64LibDirs), end(MIPS64LibDirs));
2070    TripleAliases.append(begin(MIPS64Triples), end(MIPS64Triples));
2071    BiarchLibDirs.append(begin(MIPSLibDirs), end(MIPSLibDirs));
2072    BiarchTripleAliases.append(begin(MIPSTriples), end(MIPSTriples));
2073    break;
2074  case llvm::Triple::mips64el:
2075    LibDirs.append(begin(MIPS64ELLibDirs), end(MIPS64ELLibDirs));
2076    TripleAliases.append(begin(MIPS64ELTriples), end(MIPS64ELTriples));
2077    BiarchLibDirs.append(begin(MIPSELLibDirs), end(MIPSELLibDirs));
2078    BiarchTripleAliases.append(begin(MIPSELTriples), end(MIPSELTriples));
2079    BiarchTripleAliases.append(begin(MIPSTriples), end(MIPSTriples));
2080    break;
2081  case llvm::Triple::ppc:
2082    LibDirs.append(begin(PPCLibDirs), end(PPCLibDirs));
2083    TripleAliases.append(begin(PPCTriples), end(PPCTriples));
2084    BiarchLibDirs.append(begin(PPC64LibDirs), end(PPC64LibDirs));
2085    BiarchTripleAliases.append(begin(PPC64Triples), end(PPC64Triples));
2086    break;
2087  case llvm::Triple::ppc64:
2088    LibDirs.append(begin(PPC64LibDirs), end(PPC64LibDirs));
2089    TripleAliases.append(begin(PPC64Triples), end(PPC64Triples));
2090    BiarchLibDirs.append(begin(PPCLibDirs), end(PPCLibDirs));
2091    BiarchTripleAliases.append(begin(PPCTriples), end(PPCTriples));
2092    break;
2093  case llvm::Triple::ppc64le:
2094    LibDirs.append(begin(PPC64LELibDirs), end(PPC64LELibDirs));
2095    TripleAliases.append(begin(PPC64LETriples), end(PPC64LETriples));
2096    break;
2097  case llvm::Triple::riscv32:
2098    LibDirs.append(begin(RISCV32LibDirs), end(RISCV32LibDirs));
2099    BiarchLibDirs.append(begin(RISCV32LibDirs), end(RISCV32LibDirs));
2100    TripleAliases.append(begin(RISCVTriples), end(RISCVTriples));
2101    BiarchTripleAliases.append(begin(RISCVTriples), end(RISCVTriples));
2102    break;
2103  case llvm::Triple::sparc:
2104  case llvm::Triple::sparcel:
2105    LibDirs.append(begin(SPARCv8LibDirs), end(SPARCv8LibDirs));
2106    TripleAliases.append(begin(SPARCv8Triples), end(SPARCv8Triples));
2107    BiarchLibDirs.append(begin(SPARCv9LibDirs), end(SPARCv9LibDirs));
2108    BiarchTripleAliases.append(begin(SPARCv9Triples), end(SPARCv9Triples));
2109    break;
2110  case llvm::Triple::sparcv9:
2111    LibDirs.append(begin(SPARCv9LibDirs), end(SPARCv9LibDirs));
2112    TripleAliases.append(begin(SPARCv9Triples), end(SPARCv9Triples));
2113    BiarchLibDirs.append(begin(SPARCv8LibDirs), end(SPARCv8LibDirs));
2114    BiarchTripleAliases.append(begin(SPARCv8Triples), end(SPARCv8Triples));
2115    break;
2116  case llvm::Triple::systemz:
2117    LibDirs.append(begin(SystemZLibDirs), end(SystemZLibDirs));
2118    TripleAliases.append(begin(SystemZTriples), end(SystemZTriples));
2119    break;
2120  default:
2121    // By default, just rely on the standard lib directories and the original
2122    // triple.
2123    break;
2124  }
2125
2126  // Always append the drivers target triple to the end, in case it doesn't
2127  // match any of our aliases.
2128  TripleAliases.push_back(TargetTriple.str());
2129
2130  // Also include the multiarch variant if it's different.
2131  if (TargetTriple.str() != BiarchTriple.str())
2132    BiarchTripleAliases.push_back(BiarchTriple.str());
2133}
2134
2135bool Generic_GCC::GCCInstallationDetector::ScanGCCForMultilibs(
2136    const llvm::Triple &TargetTriple, const ArgList &Args,
2137    StringRef Path, bool NeedsBiarchSuffix) {
2138  llvm::Triple::ArchType TargetArch = TargetTriple.getArch();
2139  DetectedMultilibs Detected;
2140
2141  // Android standalone toolchain could have multilibs for ARM and Thumb.
2142  // Debian mips multilibs behave more like the rest of the biarch ones,
2143  // so handle them there
2144  if (isArmOrThumbArch(TargetArch) && TargetTriple.isAndroid()) {
2145    // It should also work without multilibs in a simplified toolchain.
2146    findAndroidArmMultilibs(D, TargetTriple, Path, Args, Detected);
2147  } else if (TargetTriple.isMIPS()) {
2148    if (!findMIPSMultilibs(D, TargetTriple, Path, Args, Detected))
2149      return false;
2150  } else if (isRISCV(TargetArch)) {
2151    findRISCVMultilibs(D, TargetTriple, Path, Args, Detected);
2152  } else if (!findBiarchMultilibs(D, TargetTriple, Path, Args,
2153                                  NeedsBiarchSuffix, Detected)) {
2154    return false;
2155  }
2156
2157  Multilibs = Detected.Multilibs;
2158  SelectedMultilib = Detected.SelectedMultilib;
2159  BiarchSibling = Detected.BiarchSibling;
2160
2161  return true;
2162}
2163
2164void Generic_GCC::GCCInstallationDetector::ScanLibDirForGCCTriple(
2165    const llvm::Triple &TargetTriple, const ArgList &Args,
2166    const std::string &LibDir, StringRef CandidateTriple,
2167    bool NeedsBiarchSuffix) {
2168  llvm::Triple::ArchType TargetArch = TargetTriple.getArch();
2169  // Locations relative to the system lib directory where GCC's triple-specific
2170  // directories might reside.
2171  struct GCCLibSuffix {
2172    // Path from system lib directory to GCC triple-specific directory.
2173    std::string LibSuffix;
2174    // Path from GCC triple-specific directory back to system lib directory.
2175    // This is one '..' component per component in LibSuffix.
2176    StringRef ReversePath;
2177    // Whether this library suffix is relevant for the triple.
2178    bool Active;
2179  } Suffixes[] = {
2180      // This is the normal place.
2181      {"gcc/" + CandidateTriple.str(), "../..", true},
2182
2183      // Debian puts cross-compilers in gcc-cross.
2184      {"gcc-cross/" + CandidateTriple.str(), "../..",
2185       TargetTriple.getOS() != llvm::Triple::Solaris},
2186
2187      // The Freescale PPC SDK has the gcc libraries in
2188      // <sysroot>/usr/lib/<triple>/x.y.z so have a look there as well. Only do
2189      // this on Freescale triples, though, since some systems put a *lot* of
2190      // files in that location, not just GCC installation data.
2191      {CandidateTriple.str(), "..",
2192       TargetTriple.getVendor() == llvm::Triple::Freescale ||
2193       TargetTriple.getVendor() == llvm::Triple::OpenEmbedded},
2194
2195      // Natively multiarch systems sometimes put the GCC triple-specific
2196      // directory within their multiarch lib directory, resulting in the
2197      // triple appearing twice.
2198      {CandidateTriple.str() + "/gcc/" + CandidateTriple.str(), "../../..",
2199       TargetTriple.getOS() != llvm::Triple::Solaris},
2200
2201      // Deal with cases (on Ubuntu) where the system architecture could be i386
2202      // but the GCC target architecture could be (say) i686.
2203      // FIXME: It may be worthwhile to generalize this and look for a second
2204      // triple.
2205      {"i386-linux-gnu/gcc/" + CandidateTriple.str(), "../../..",
2206       (TargetArch == llvm::Triple::x86 &&
2207        TargetTriple.getOS() != llvm::Triple::Solaris)}};
2208
2209  for (auto &Suffix : Suffixes) {
2210    if (!Suffix.Active)
2211      continue;
2212
2213    StringRef LibSuffix = Suffix.LibSuffix;
2214    std::error_code EC;
2215    for (vfs::directory_iterator
2216             LI = D.getVFS().dir_begin(LibDir + "/" + LibSuffix, EC),
2217             LE;
2218         !EC && LI != LE; LI = LI.increment(EC)) {
2219      StringRef VersionText = llvm::sys::path::filename(LI->getName());
2220      GCCVersion CandidateVersion = GCCVersion::Parse(VersionText);
2221      if (CandidateVersion.Major != -1) // Filter obviously bad entries.
2222        if (!CandidateGCCInstallPaths.insert(LI->getName()).second)
2223          continue; // Saw this path before; no need to look at it again.
2224      if (CandidateVersion.isOlderThan(4, 1, 1))
2225        continue;
2226      if (CandidateVersion <= Version)
2227        continue;
2228
2229      if (!ScanGCCForMultilibs(TargetTriple, Args, LI->getName(),
2230                               NeedsBiarchSuffix))
2231        continue;
2232
2233      Version = CandidateVersion;
2234      GCCTriple.setTriple(CandidateTriple);
2235      // FIXME: We hack together the directory name here instead of
2236      // using LI to ensure stable path separators across Windows and
2237      // Linux.
2238      GCCInstallPath = (LibDir + "/" + LibSuffix + "/" + VersionText).str();
2239      GCCParentLibPath = (GCCInstallPath + "/../" + Suffix.ReversePath).str();
2240      IsValid = true;
2241    }
2242  }
2243}
2244
2245bool Generic_GCC::GCCInstallationDetector::ScanGentooConfigs(
2246    const llvm::Triple &TargetTriple, const ArgList &Args,
2247    const SmallVectorImpl<StringRef> &CandidateTriples,
2248    const SmallVectorImpl<StringRef> &CandidateBiarchTriples) {
2249  for (StringRef CandidateTriple : CandidateTriples) {
2250    if (ScanGentooGccConfig(TargetTriple, Args, CandidateTriple))
2251      return true;
2252  }
2253
2254  for (StringRef CandidateTriple : CandidateBiarchTriples) {
2255    if (ScanGentooGccConfig(TargetTriple, Args, CandidateTriple, true))
2256      return true;
2257  }
2258  return false;
2259}
2260
2261bool Generic_GCC::GCCInstallationDetector::ScanGentooGccConfig(
2262    const llvm::Triple &TargetTriple, const ArgList &Args,
2263    StringRef CandidateTriple, bool NeedsBiarchSuffix) {
2264  llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> File =
2265      D.getVFS().getBufferForFile(D.SysRoot + "/etc/env.d/gcc/config-" +
2266                                  CandidateTriple.str());
2267  if (File) {
2268    SmallVector<StringRef, 2> Lines;
2269    File.get()->getBuffer().split(Lines, "\n");
2270    for (StringRef Line : Lines) {
2271      Line = Line.trim();
2272      // CURRENT=triple-version
2273      if (!Line.consume_front("CURRENT="))
2274        continue;
2275      // Process the config file pointed to by CURRENT.
2276      llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> ConfigFile =
2277          D.getVFS().getBufferForFile(D.SysRoot + "/etc/env.d/gcc/" +
2278                                      Line.str());
2279      std::pair<StringRef, StringRef> ActiveVersion = Line.rsplit('-');
2280      // List of paths to scan for libraries.
2281      SmallVector<StringRef, 4> GentooScanPaths;
2282      // Scan the Config file to find installed GCC libraries path.
2283      // Typical content of the GCC config file:
2284      // LDPATH="/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.x:/usr/lib/gcc/
2285      // (continued from previous line) x86_64-pc-linux-gnu/4.9.x/32"
2286      // MANPATH="/usr/share/gcc-data/x86_64-pc-linux-gnu/4.9.x/man"
2287      // INFOPATH="/usr/share/gcc-data/x86_64-pc-linux-gnu/4.9.x/info"
2288      // STDCXX_INCDIR="/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.x/include/g++-v4"
2289      // We are looking for the paths listed in LDPATH=... .
2290      if (ConfigFile) {
2291        SmallVector<StringRef, 2> ConfigLines;
2292        ConfigFile.get()->getBuffer().split(ConfigLines, "\n");
2293        for (StringRef ConfLine : ConfigLines) {
2294          ConfLine = ConfLine.trim();
2295          if (ConfLine.consume_front("LDPATH=")) {
2296            // Drop '"' from front and back if present.
2297            ConfLine.consume_back("\"");
2298            ConfLine.consume_front("\"");
2299            // Get all paths sperated by ':'
2300            ConfLine.split(GentooScanPaths, ':', -1, /*AllowEmpty*/ false);
2301          }
2302        }
2303      }
2304      // Test the path based on the version in /etc/env.d/gcc/config-{tuple}.
2305      std::string basePath = "/usr/lib/gcc/" + ActiveVersion.first.str() + "/"
2306          + ActiveVersion.second.str();
2307      GentooScanPaths.push_back(StringRef(basePath));
2308
2309      // Scan all paths for GCC libraries.
2310      for (const auto &GentooScanPath : GentooScanPaths) {
2311        std::string GentooPath = D.SysRoot + std::string(GentooScanPath);
2312        if (D.getVFS().exists(GentooPath + "/crtbegin.o")) {
2313          if (!ScanGCCForMultilibs(TargetTriple, Args, GentooPath,
2314                                   NeedsBiarchSuffix))
2315            continue;
2316
2317          Version = GCCVersion::Parse(ActiveVersion.second);
2318          GCCInstallPath = GentooPath;
2319          GCCParentLibPath = GentooPath + std::string("/../../..");
2320          GCCTriple.setTriple(ActiveVersion.first);
2321          IsValid = true;
2322          return true;
2323        }
2324      }
2325    }
2326  }
2327
2328  return false;
2329}
2330
2331Generic_GCC::Generic_GCC(const Driver &D, const llvm::Triple &Triple,
2332                         const ArgList &Args)
2333    : ToolChain(D, Triple, Args), GCCInstallation(D),
2334      CudaInstallation(D, Triple, Args) {
2335  getProgramPaths().push_back(getDriver().getInstalledDir());
2336  if (getDriver().getInstalledDir() != getDriver().Dir)
2337    getProgramPaths().push_back(getDriver().Dir);
2338}
2339
2340Generic_GCC::~Generic_GCC() {}
2341
2342Tool *Generic_GCC::getTool(Action::ActionClass AC) const {
2343  switch (AC) {
2344  case Action::PreprocessJobClass:
2345    if (!Preprocess)
2346      Preprocess.reset(new clang::driver::tools::gcc::Preprocessor(*this));
2347    return Preprocess.get();
2348  case Action::CompileJobClass:
2349    if (!Compile)
2350      Compile.reset(new tools::gcc::Compiler(*this));
2351    return Compile.get();
2352  default:
2353    return ToolChain::getTool(AC);
2354  }
2355}
2356
2357Tool *Generic_GCC::buildAssembler() const {
2358  return new tools::gnutools::Assembler(*this);
2359}
2360
2361Tool *Generic_GCC::buildLinker() const { return new tools::gcc::Linker(*this); }
2362
2363void Generic_GCC::printVerboseInfo(raw_ostream &OS) const {
2364  // Print the information about how we detected the GCC installation.
2365  GCCInstallation.print(OS);
2366  CudaInstallation.print(OS);
2367}
2368
2369bool Generic_GCC::IsUnwindTablesDefault(const ArgList &Args) const {
2370  return getArch() == llvm::Triple::x86_64;
2371}
2372
2373bool Generic_GCC::isPICDefault() const {
2374  switch (getArch()) {
2375  case llvm::Triple::x86_64:
2376    return getTriple().isOSWindows();
2377  case llvm::Triple::ppc64:
2378  case llvm::Triple::ppc64le:
2379    return !getTriple().isOSBinFormatMachO() && !getTriple().isMacOSX();
2380  case llvm::Triple::mips64:
2381  case llvm::Triple::mips64el:
2382    return true;
2383  default:
2384    return false;
2385  }
2386}
2387
2388bool Generic_GCC::isPIEDefault() const { return false; }
2389
2390bool Generic_GCC::isPICDefaultForced() const {
2391  return getArch() == llvm::Triple::x86_64 && getTriple().isOSWindows();
2392}
2393
2394bool Generic_GCC::IsIntegratedAssemblerDefault() const {
2395  switch (getTriple().getArch()) {
2396  case llvm::Triple::x86:
2397  case llvm::Triple::x86_64:
2398  case llvm::Triple::aarch64:
2399  case llvm::Triple::aarch64_be:
2400  case llvm::Triple::arm:
2401  case llvm::Triple::armeb:
2402  case llvm::Triple::avr:
2403  case llvm::Triple::bpfel:
2404  case llvm::Triple::bpfeb:
2405  case llvm::Triple::thumb:
2406  case llvm::Triple::thumbeb:
2407  case llvm::Triple::ppc:
2408  case llvm::Triple::ppc64:
2409  case llvm::Triple::ppc64le:
2410  case llvm::Triple::riscv32:
2411  case llvm::Triple::riscv64:
2412  case llvm::Triple::systemz:
2413  case llvm::Triple::mips:
2414  case llvm::Triple::mipsel:
2415    return true;
2416  case llvm::Triple::mips64:
2417  case llvm::Triple::mips64el:
2418    // Enabled for Debian, Android, FreeBSD and OpenBSD mips64/mipsel, as they
2419    // can precisely identify the ABI in use (Debian) or only use N64 for MIPS64
2420    // (Android). Other targets are unable to distinguish N32 from N64.
2421    if (getTriple().getEnvironment() == llvm::Triple::GNUABI64 ||
2422        getTriple().isAndroid() ||
2423        getTriple().isOSFreeBSD() ||
2424        getTriple().isOSOpenBSD())
2425      return true;
2426    return false;
2427  default:
2428    return false;
2429  }
2430}
2431
2432void Generic_GCC::AddClangCXXStdlibIncludeArgs(const ArgList &DriverArgs,
2433                                               ArgStringList &CC1Args) const {
2434  if (DriverArgs.hasArg(options::OPT_nostdlibinc) ||
2435      DriverArgs.hasArg(options::OPT_nostdincxx))
2436    return;
2437
2438  switch (GetCXXStdlibType(DriverArgs)) {
2439  case ToolChain::CST_Libcxx:
2440    addLibCxxIncludePaths(DriverArgs, CC1Args);
2441    break;
2442
2443  case ToolChain::CST_Libstdcxx:
2444    addLibStdCxxIncludePaths(DriverArgs, CC1Args);
2445    break;
2446  }
2447}
2448
2449void
2450Generic_GCC::addLibCxxIncludePaths(const llvm::opt::ArgList &DriverArgs,
2451                                   llvm::opt::ArgStringList &CC1Args) const {
2452  // FIXME: The Linux behavior would probaby be a better approach here.
2453  addSystemInclude(DriverArgs, CC1Args,
2454                   getDriver().SysRoot + "/usr/include/c++/v1");
2455}
2456
2457void
2458Generic_GCC::addLibStdCxxIncludePaths(const llvm::opt::ArgList &DriverArgs,
2459                                      llvm::opt::ArgStringList &CC1Args) const {
2460  // By default, we don't assume we know where libstdc++ might be installed.
2461  // FIXME: If we have a valid GCCInstallation, use it.
2462}
2463
2464/// Helper to add the variant paths of a libstdc++ installation.
2465bool Generic_GCC::addLibStdCXXIncludePaths(
2466    Twine Base, Twine Suffix, StringRef GCCTriple, StringRef GCCMultiarchTriple,
2467    StringRef TargetMultiarchTriple, Twine IncludeSuffix,
2468    const ArgList &DriverArgs, ArgStringList &CC1Args) const {
2469  if (!getVFS().exists(Base + Suffix))
2470    return false;
2471
2472  addSystemInclude(DriverArgs, CC1Args, Base + Suffix);
2473
2474  // The vanilla GCC layout of libstdc++ headers uses a triple subdirectory. If
2475  // that path exists or we have neither a GCC nor target multiarch triple, use
2476  // this vanilla search path.
2477  if ((GCCMultiarchTriple.empty() && TargetMultiarchTriple.empty()) ||
2478      getVFS().exists(Base + Suffix + "/" + GCCTriple + IncludeSuffix)) {
2479    addSystemInclude(DriverArgs, CC1Args,
2480                     Base + Suffix + "/" + GCCTriple + IncludeSuffix);
2481  } else {
2482    // Otherwise try to use multiarch naming schemes which have normalized the
2483    // triples and put the triple before the suffix.
2484    //
2485    // GCC surprisingly uses *both* the GCC triple with a multilib suffix and
2486    // the target triple, so we support that here.
2487    addSystemInclude(DriverArgs, CC1Args,
2488                     Base + "/" + GCCMultiarchTriple + Suffix + IncludeSuffix);
2489    addSystemInclude(DriverArgs, CC1Args,
2490                     Base + "/" + TargetMultiarchTriple + Suffix);
2491  }
2492
2493  addSystemInclude(DriverArgs, CC1Args, Base + Suffix + "/backward");
2494  return true;
2495}
2496
2497llvm::opt::DerivedArgList *
2498Generic_GCC::TranslateArgs(const llvm::opt::DerivedArgList &Args, StringRef,
2499                           Action::OffloadKind DeviceOffloadKind) const {
2500
2501  // If this tool chain is used for an OpenMP offloading device we have to make
2502  // sure we always generate a shared library regardless of the commands the
2503  // user passed to the host. This is required because the runtime library
2504  // is required to load the device image dynamically at run time.
2505  if (DeviceOffloadKind == Action::OFK_OpenMP) {
2506    DerivedArgList *DAL = new DerivedArgList(Args.getBaseArgs());
2507    const OptTable &Opts = getDriver().getOpts();
2508
2509    // Request the shared library. Given that these options are decided
2510    // implicitly, they do not refer to any base argument.
2511    DAL->AddFlagArg(/*BaseArg=*/nullptr, Opts.getOption(options::OPT_shared));
2512    DAL->AddFlagArg(/*BaseArg=*/nullptr, Opts.getOption(options::OPT_fPIC));
2513
2514    // Filter all the arguments we don't care passing to the offloading
2515    // toolchain as they can mess up with the creation of a shared library.
2516    for (auto *A : Args) {
2517      switch ((options::ID)A->getOption().getID()) {
2518      default:
2519        DAL->append(A);
2520        break;
2521      case options::OPT_shared:
2522      case options::OPT_dynamic:
2523      case options::OPT_static:
2524      case options::OPT_fPIC:
2525      case options::OPT_fno_PIC:
2526      case options::OPT_fpic:
2527      case options::OPT_fno_pic:
2528      case options::OPT_fPIE:
2529      case options::OPT_fno_PIE:
2530      case options::OPT_fpie:
2531      case options::OPT_fno_pie:
2532        break;
2533      }
2534    }
2535    return DAL;
2536  }
2537  return nullptr;
2538}
2539
2540void Generic_ELF::anchor() {}
2541
2542void Generic_ELF::addClangTargetOptions(const ArgList &DriverArgs,
2543                                        ArgStringList &CC1Args,
2544                                        Action::OffloadKind) const {
2545  const Generic_GCC::GCCVersion &V = GCCInstallation.getVersion();
2546  bool UseInitArrayDefault =
2547      getTriple().getArch() == llvm::Triple::aarch64 ||
2548      getTriple().getArch() == llvm::Triple::aarch64_be ||
2549      (getTriple().getOS() == llvm::Triple::FreeBSD &&
2550       getTriple().getOSMajorVersion() >= 12) ||
2551      (getTriple().getOS() == llvm::Triple::Linux &&
2552       ((!GCCInstallation.isValid() || !V.isOlderThan(4, 7, 0)) ||
2553        getTriple().isAndroid())) ||
2554      getTriple().getOS() == llvm::Triple::NaCl ||
2555      (getTriple().getVendor() == llvm::Triple::MipsTechnologies &&
2556       !getTriple().hasEnvironment()) ||
2557      getTriple().getOS() == llvm::Triple::Solaris;
2558
2559  if (DriverArgs.hasFlag(options::OPT_fuse_init_array,
2560                         options::OPT_fno_use_init_array, UseInitArrayDefault))
2561    CC1Args.push_back("-fuse-init-array");
2562}
2563