Gnu.cpp revision 321238 
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 "Linux.h"
12#include "Arch/ARM.h"
13#include "Arch/Mips.h"
14#include "Arch/Sparc.h"
15#include "Arch/SystemZ.h"
16#include "CommonArgs.h"
17#include "clang/Basic/VirtualFileSystem.h"
18#include "clang/Config/config.h" // for GCC_INSTALL_PREFIX
19#include "clang/Driver/Compilation.h"
20#include "clang/Driver/Driver.h"
21#include "clang/Driver/DriverDiagnostic.h"
22#include "clang/Driver/Options.h"
23#include "clang/Driver/Tool.h"
24#include "llvm/Option/ArgList.h"
25#include "llvm/Support/CodeGen.h"
26#include "llvm/Support/Path.h"
27#include "llvm/Support/TargetParser.h"
28#include <system_error>
29
30using namespace clang::driver;
31using namespace clang::driver::toolchains;
32using namespace clang;
33using namespace llvm::opt;
34
35void tools::GnuTool::anchor() {}
36
37static bool forwardToGCC(const Option &O) {
38  // Don't forward inputs from the original command line.  They are added from
39  // InputInfoList.
40  return O.getKind() != Option::InputClass &&
41         !O.hasFlag(options::DriverOption) && !O.hasFlag(options::LinkerInput);
42}
43
44void tools::gcc::Common::ConstructJob(Compilation &C, const JobAction &JA,
45                                      const InputInfo &Output,
46                                      const InputInfoList &Inputs,
47                                      const ArgList &Args,
48                                      const char *LinkingOutput) const {
49  const Driver &D = getToolChain().getDriver();
50  ArgStringList CmdArgs;
51
52  for (const auto &A : Args) {
53    if (forwardToGCC(A->getOption())) {
54      // It is unfortunate that we have to claim here, as this means
55      // we will basically never report anything interesting for
56      // platforms using a generic gcc, even if we are just using gcc
57      // to get to the assembler.
58      A->claim();
59
60      // Don't forward any -g arguments to assembly steps.
61      if (isa<AssembleJobAction>(JA) &&
62          A->getOption().matches(options::OPT_g_Group))
63        continue;
64
65      // Don't forward any -W arguments to assembly and link steps.
66      if ((isa<AssembleJobAction>(JA) || isa<LinkJobAction>(JA)) &&
67          A->getOption().matches(options::OPT_W_Group))
68        continue;
69
70      A->render(Args, CmdArgs);
71    }
72  }
73
74  RenderExtraToolArgs(JA, CmdArgs);
75
76  // If using a driver driver, force the arch.
77  if (getToolChain().getTriple().isOSDarwin()) {
78    CmdArgs.push_back("-arch");
79    CmdArgs.push_back(
80        Args.MakeArgString(getToolChain().getDefaultUniversalArchName()));
81  }
82
83  // Try to force gcc to match the tool chain we want, if we recognize
84  // the arch.
85  //
86  // FIXME: The triple class should directly provide the information we want
87  // here.
88  switch (getToolChain().getArch()) {
89  default:
90    break;
91  case llvm::Triple::x86:
92  case llvm::Triple::ppc:
93    CmdArgs.push_back("-m32");
94    break;
95  case llvm::Triple::x86_64:
96  case llvm::Triple::ppc64:
97  case llvm::Triple::ppc64le:
98    CmdArgs.push_back("-m64");
99    break;
100  case llvm::Triple::sparcel:
101    CmdArgs.push_back("-EL");
102    break;
103  }
104
105  if (Output.isFilename()) {
106    CmdArgs.push_back("-o");
107    CmdArgs.push_back(Output.getFilename());
108  } else {
109    assert(Output.isNothing() && "Unexpected output");
110    CmdArgs.push_back("-fsyntax-only");
111  }
112
113  Args.AddAllArgValues(CmdArgs, options::OPT_Wa_COMMA, options::OPT_Xassembler);
114
115  // Only pass -x if gcc will understand it; otherwise hope gcc
116  // understands the suffix correctly. The main use case this would go
117  // wrong in is for linker inputs if they happened to have an odd
118  // suffix; really the only way to get this to happen is a command
119  // like '-x foobar a.c' which will treat a.c like a linker input.
120  //
121  // FIXME: For the linker case specifically, can we safely convert
122  // inputs into '-Wl,' options?
123  for (const auto &II : Inputs) {
124    // Don't try to pass LLVM or AST inputs to a generic gcc.
125    if (types::isLLVMIR(II.getType()))
126      D.Diag(clang::diag::err_drv_no_linker_llvm_support)
127          << getToolChain().getTripleString();
128    else if (II.getType() == types::TY_AST)
129      D.Diag(diag::err_drv_no_ast_support) << getToolChain().getTripleString();
130    else if (II.getType() == types::TY_ModuleFile)
131      D.Diag(diag::err_drv_no_module_support)
132          << getToolChain().getTripleString();
133
134    if (types::canTypeBeUserSpecified(II.getType())) {
135      CmdArgs.push_back("-x");
136      CmdArgs.push_back(types::getTypeName(II.getType()));
137    }
138
139    if (II.isFilename())
140      CmdArgs.push_back(II.getFilename());
141    else {
142      const Arg &A = II.getInputArg();
143
144      // Reverse translate some rewritten options.
145      if (A.getOption().matches(options::OPT_Z_reserved_lib_stdcxx)) {
146        CmdArgs.push_back("-lstdc++");
147        continue;
148      }
149
150      // Don't render as input, we need gcc to do the translations.
151      A.render(Args, CmdArgs);
152    }
153  }
154
155  const std::string &customGCCName = D.getCCCGenericGCCName();
156  const char *GCCName;
157  if (!customGCCName.empty())
158    GCCName = customGCCName.c_str();
159  else if (D.CCCIsCXX()) {
160    GCCName = "g++";
161  } else
162    GCCName = "gcc";
163
164  const char *Exec = Args.MakeArgString(getToolChain().GetProgramPath(GCCName));
165  C.addCommand(llvm::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));
166}
167
168void tools::gcc::Preprocessor::RenderExtraToolArgs(
169    const JobAction &JA, ArgStringList &CmdArgs) const {
170  CmdArgs.push_back("-E");
171}
172
173void tools::gcc::Compiler::RenderExtraToolArgs(const JobAction &JA,
174                                               ArgStringList &CmdArgs) const {
175  const Driver &D = getToolChain().getDriver();
176
177  switch (JA.getType()) {
178  // If -flto, etc. are present then make sure not to force assembly output.
179  case types::TY_LLVM_IR:
180  case types::TY_LTO_IR:
181  case types::TY_LLVM_BC:
182  case types::TY_LTO_BC:
183    CmdArgs.push_back("-c");
184    break;
185  // We assume we've got an "integrated" assembler in that gcc will produce an
186  // object file itself.
187  case types::TY_Object:
188    CmdArgs.push_back("-c");
189    break;
190  case types::TY_PP_Asm:
191    CmdArgs.push_back("-S");
192    break;
193  case types::TY_Nothing:
194    CmdArgs.push_back("-fsyntax-only");
195    break;
196  default:
197    D.Diag(diag::err_drv_invalid_gcc_output_type) << getTypeName(JA.getType());
198  }
199}
200
201void tools::gcc::Linker::RenderExtraToolArgs(const JobAction &JA,
202                                             ArgStringList &CmdArgs) const {
203  // The types are (hopefully) good enough.
204}
205
206/// Add OpenMP linker script arguments at the end of the argument list so that
207/// the fat binary is built by embedding each of the device images into the
208/// host. The linker script also defines a few symbols required by the code
209/// generation so that the images can be easily retrieved at runtime by the
210/// offloading library. This should be used only in tool chains that support
211/// linker scripts.
212static void AddOpenMPLinkerScript(const ToolChain &TC, Compilation &C,
213                                  const InputInfo &Output,
214                                  const InputInfoList &Inputs,
215                                  const ArgList &Args, ArgStringList &CmdArgs,
216                                  const JobAction &JA) {
217
218  // If this is not an OpenMP host toolchain, we don't need to do anything.
219  if (!JA.isHostOffloading(Action::OFK_OpenMP))
220    return;
221
222  // Create temporary linker script. Keep it if save-temps is enabled.
223  const char *LKS;
224  SmallString<256> Name = llvm::sys::path::filename(Output.getFilename());
225  if (C.getDriver().isSaveTempsEnabled()) {
226    llvm::sys::path::replace_extension(Name, "lk");
227    LKS = C.getArgs().MakeArgString(Name.c_str());
228  } else {
229    llvm::sys::path::replace_extension(Name, "");
230    Name = C.getDriver().GetTemporaryPath(Name, "lk");
231    LKS = C.addTempFile(C.getArgs().MakeArgString(Name.c_str()));
232  }
233
234  // Add linker script option to the command.
235  CmdArgs.push_back("-T");
236  CmdArgs.push_back(LKS);
237
238  // Create a buffer to write the contents of the linker script.
239  std::string LksBuffer;
240  llvm::raw_string_ostream LksStream(LksBuffer);
241
242  // Get the OpenMP offload tool chains so that we can extract the triple
243  // associated with each device input.
244  auto OpenMPToolChains = C.getOffloadToolChains<Action::OFK_OpenMP>();
245  assert(OpenMPToolChains.first != OpenMPToolChains.second &&
246         "No OpenMP toolchains??");
247
248  // Track the input file name and device triple in order to build the script,
249  // inserting binaries in the designated sections.
250  SmallVector<std::pair<std::string, const char *>, 8> InputBinaryInfo;
251
252  // Add commands to embed target binaries. We ensure that each section and
253  // image is 16-byte aligned. This is not mandatory, but increases the
254  // likelihood of data to be aligned with a cache block in several main host
255  // machines.
256  LksStream << "/*\n";
257  LksStream << "       OpenMP Offload Linker Script\n";
258  LksStream << " *** Automatically generated by Clang ***\n";
259  LksStream << "*/\n";
260  LksStream << "TARGET(binary)\n";
261  auto DTC = OpenMPToolChains.first;
262  for (auto &II : Inputs) {
263    const Action *A = II.getAction();
264    // Is this a device linking action?
265    if (A && isa<LinkJobAction>(A) &&
266        A->isDeviceOffloading(Action::OFK_OpenMP)) {
267      assert(DTC != OpenMPToolChains.second &&
268             "More device inputs than device toolchains??");
269      InputBinaryInfo.push_back(std::make_pair(
270          DTC->second->getTriple().normalize(), II.getFilename()));
271      ++DTC;
272      LksStream << "INPUT(" << II.getFilename() << ")\n";
273    }
274  }
275
276  assert(DTC == OpenMPToolChains.second &&
277         "Less device inputs than device toolchains??");
278
279  LksStream << "SECTIONS\n";
280  LksStream << "{\n";
281
282  // Put each target binary into a separate section.
283  for (const auto &BI : InputBinaryInfo) {
284    LksStream << "  .omp_offloading." << BI.first << " :\n";
285    LksStream << "  ALIGN(0x10)\n";
286    LksStream << "  {\n";
287    LksStream << "    PROVIDE_HIDDEN(.omp_offloading.img_start." << BI.first
288              << " = .);\n";
289    LksStream << "    " << BI.second << "\n";
290    LksStream << "    PROVIDE_HIDDEN(.omp_offloading.img_end." << BI.first
291              << " = .);\n";
292    LksStream << "  }\n";
293  }
294
295  // Add commands to define host entries begin and end. We use 1-byte subalign
296  // so that the linker does not add any padding and the elements in this
297  // section form an array.
298  LksStream << "  .omp_offloading.entries :\n";
299  LksStream << "  ALIGN(0x10)\n";
300  LksStream << "  SUBALIGN(0x01)\n";
301  LksStream << "  {\n";
302  LksStream << "    PROVIDE_HIDDEN(.omp_offloading.entries_begin = .);\n";
303  LksStream << "    *(.omp_offloading.entries)\n";
304  LksStream << "    PROVIDE_HIDDEN(.omp_offloading.entries_end = .);\n";
305  LksStream << "  }\n";
306  LksStream << "}\n";
307  LksStream << "INSERT BEFORE .data\n";
308  LksStream.flush();
309
310  // Dump the contents of the linker script if the user requested that. We
311  // support this option to enable testing of behavior with -###.
312  if (C.getArgs().hasArg(options::OPT_fopenmp_dump_offload_linker_script))
313    llvm::errs() << LksBuffer;
314
315  // If this is a dry run, do not create the linker script file.
316  if (C.getArgs().hasArg(options::OPT__HASH_HASH_HASH))
317    return;
318
319  // Open script file and write the contents.
320  std::error_code EC;
321  llvm::raw_fd_ostream Lksf(LKS, EC, llvm::sys::fs::F_None);
322
323  if (EC) {
324    C.getDriver().Diag(clang::diag::err_unable_to_make_temp) << EC.message();
325    return;
326  }
327
328  Lksf << LksBuffer;
329}
330
331static bool addXRayRuntime(const ToolChain &TC, const ArgList &Args,
332                           ArgStringList &CmdArgs) {
333  if (Args.hasFlag(options::OPT_fxray_instrument,
334                   options::OPT_fnoxray_instrument, false)) {
335    CmdArgs.push_back("-whole-archive");
336    CmdArgs.push_back(TC.getCompilerRTArgString(Args, "xray", false));
337    CmdArgs.push_back("-no-whole-archive");
338    return true;
339  }
340  return false;
341}
342
343static void linkXRayRuntimeDeps(const ToolChain &TC, const ArgList &Args,
344                                ArgStringList &CmdArgs) {
345  CmdArgs.push_back("--no-as-needed");
346  CmdArgs.push_back("-lpthread");
347  CmdArgs.push_back("-lrt");
348  CmdArgs.push_back("-lm");
349
350  if (TC.getTriple().getOS() != llvm::Triple::FreeBSD)
351    CmdArgs.push_back("-ldl");
352}
353
354static const char *getLDMOption(const llvm::Triple &T, const ArgList &Args) {
355  switch (T.getArch()) {
356  case llvm::Triple::x86:
357    if (T.isOSIAMCU())
358      return "elf_iamcu";
359    return "elf_i386";
360  case llvm::Triple::aarch64:
361    return "aarch64linux";
362  case llvm::Triple::aarch64_be:
363    return "aarch64_be_linux";
364  case llvm::Triple::arm:
365  case llvm::Triple::thumb:
366    return "armelf_linux_eabi";
367  case llvm::Triple::armeb:
368  case llvm::Triple::thumbeb:
369    return "armelfb_linux_eabi";
370  case llvm::Triple::ppc:
371    return "elf32ppclinux";
372  case llvm::Triple::ppc64:
373    return "elf64ppc";
374  case llvm::Triple::ppc64le:
375    return "elf64lppc";
376  case llvm::Triple::sparc:
377  case llvm::Triple::sparcel:
378    return "elf32_sparc";
379  case llvm::Triple::sparcv9:
380    return "elf64_sparc";
381  case llvm::Triple::mips:
382    return "elf32btsmip";
383  case llvm::Triple::mipsel:
384    return "elf32ltsmip";
385  case llvm::Triple::mips64:
386    if (tools::mips::hasMipsAbiArg(Args, "n32"))
387      return "elf32btsmipn32";
388    return "elf64btsmip";
389  case llvm::Triple::mips64el:
390    if (tools::mips::hasMipsAbiArg(Args, "n32"))
391      return "elf32ltsmipn32";
392    return "elf64ltsmip";
393  case llvm::Triple::systemz:
394    return "elf64_s390";
395  case llvm::Triple::x86_64:
396    if (T.getEnvironment() == llvm::Triple::GNUX32)
397      return "elf32_x86_64";
398    return "elf_x86_64";
399  default:
400    return nullptr;
401  }
402}
403
404void tools::gnutools::Linker::ConstructJob(Compilation &C, const JobAction &JA,
405                                           const InputInfo &Output,
406                                           const InputInfoList &Inputs,
407                                           const ArgList &Args,
408                                           const char *LinkingOutput) const {
409  const toolchains::Linux &ToolChain =
410      static_cast<const toolchains::Linux &>(getToolChain());
411  const Driver &D = ToolChain.getDriver();
412
413  const llvm::Triple &Triple = getToolChain().getEffectiveTriple();
414
415  const llvm::Triple::ArchType Arch = ToolChain.getArch();
416  const bool isAndroid = ToolChain.getTriple().isAndroid();
417  const bool IsIAMCU = ToolChain.getTriple().isOSIAMCU();
418  const bool IsPIE =
419      !Args.hasArg(options::OPT_shared) && !Args.hasArg(options::OPT_static) &&
420      (Args.hasArg(options::OPT_pie) || ToolChain.isPIEDefault());
421  const bool HasCRTBeginEndFiles =
422      ToolChain.getTriple().hasEnvironment() ||
423      (ToolChain.getTriple().getVendor() != llvm::Triple::MipsTechnologies);
424
425  ArgStringList CmdArgs;
426
427  // Silence warning for "clang -g foo.o -o foo"
428  Args.ClaimAllArgs(options::OPT_g_Group);
429  // and "clang -emit-llvm foo.o -o foo"
430  Args.ClaimAllArgs(options::OPT_emit_llvm);
431  // and for "clang -w foo.o -o foo". Other warning options are already
432  // handled somewhere else.
433  Args.ClaimAllArgs(options::OPT_w);
434
435  const char *Exec = Args.MakeArgString(ToolChain.GetLinkerPath());
436  if (llvm::sys::path::stem(Exec) == "lld") {
437    CmdArgs.push_back("-flavor");
438    CmdArgs.push_back("old-gnu");
439    CmdArgs.push_back("-target");
440    CmdArgs.push_back(Args.MakeArgString(getToolChain().getTripleString()));
441  }
442
443  if (!D.SysRoot.empty())
444    CmdArgs.push_back(Args.MakeArgString("--sysroot=" + D.SysRoot));
445
446  if (IsPIE)
447    CmdArgs.push_back("-pie");
448
449  if (Args.hasArg(options::OPT_rdynamic))
450    CmdArgs.push_back("-export-dynamic");
451
452  if (Args.hasArg(options::OPT_s))
453    CmdArgs.push_back("-s");
454
455  if (Arch == llvm::Triple::armeb || Arch == llvm::Triple::thumbeb)
456    arm::appendEBLinkFlags(Args, CmdArgs, Triple);
457
458  // Most Android ARM64 targets should enable the linker fix for erratum
459  // 843419. Only non-Cortex-A53 devices are allowed to skip this flag.
460  if (Arch == llvm::Triple::aarch64 && isAndroid) {
461    std::string CPU = getCPUName(Args, Triple);
462    if (CPU.empty() || CPU == "generic" || CPU == "cortex-a53")
463      CmdArgs.push_back("--fix-cortex-a53-843419");
464  }
465
466  for (const auto &Opt : ToolChain.ExtraOpts)
467    CmdArgs.push_back(Opt.c_str());
468
469  if (!Args.hasArg(options::OPT_static)) {
470    CmdArgs.push_back("--eh-frame-hdr");
471  }
472
473  if (const char *LDMOption = getLDMOption(ToolChain.getTriple(), Args)) {
474    CmdArgs.push_back("-m");
475    CmdArgs.push_back(LDMOption);
476  } else {
477    D.Diag(diag::err_target_unknown_triple) << Triple.str();
478    return;
479  }
480
481  if (Args.hasArg(options::OPT_static)) {
482    if (Arch == llvm::Triple::arm || Arch == llvm::Triple::armeb ||
483        Arch == llvm::Triple::thumb || Arch == llvm::Triple::thumbeb)
484      CmdArgs.push_back("-Bstatic");
485    else
486      CmdArgs.push_back("-static");
487  } else if (Args.hasArg(options::OPT_shared)) {
488    CmdArgs.push_back("-shared");
489  }
490
491  if (!Args.hasArg(options::OPT_static)) {
492    if (Args.hasArg(options::OPT_rdynamic))
493      CmdArgs.push_back("-export-dynamic");
494
495    if (!Args.hasArg(options::OPT_shared)) {
496      const std::string Loader =
497          D.DyldPrefix + ToolChain.getDynamicLinker(Args);
498      CmdArgs.push_back("-dynamic-linker");
499      CmdArgs.push_back(Args.MakeArgString(Loader));
500    }
501  }
502
503  CmdArgs.push_back("-o");
504  CmdArgs.push_back(Output.getFilename());
505
506  if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles)) {
507    if (!isAndroid && !IsIAMCU) {
508      const char *crt1 = nullptr;
509      if (!Args.hasArg(options::OPT_shared)) {
510        if (Args.hasArg(options::OPT_pg))
511          crt1 = "gcrt1.o";
512        else if (IsPIE)
513          crt1 = "Scrt1.o";
514        else
515          crt1 = "crt1.o";
516      }
517      if (crt1)
518        CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crt1)));
519
520      CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crti.o")));
521    }
522
523    if (IsIAMCU)
524      CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crt0.o")));
525    else {
526      const char *crtbegin;
527      if (Args.hasArg(options::OPT_static))
528        crtbegin = isAndroid ? "crtbegin_static.o" : "crtbeginT.o";
529      else if (Args.hasArg(options::OPT_shared))
530        crtbegin = isAndroid ? "crtbegin_so.o" : "crtbeginS.o";
531      else if (IsPIE)
532        crtbegin = isAndroid ? "crtbegin_dynamic.o" : "crtbeginS.o";
533      else
534        crtbegin = isAndroid ? "crtbegin_dynamic.o" : "crtbegin.o";
535
536      if (HasCRTBeginEndFiles)
537        CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtbegin)));
538    }
539
540    // Add crtfastmath.o if available and fast math is enabled.
541    ToolChain.AddFastMathRuntimeIfAvailable(Args, CmdArgs);
542  }
543
544  Args.AddAllArgs(CmdArgs, options::OPT_L);
545  Args.AddAllArgs(CmdArgs, options::OPT_u);
546
547  ToolChain.AddFilePathLibArgs(Args, CmdArgs);
548
549  if (D.isUsingLTO())
550    AddGoldPlugin(ToolChain, Args, CmdArgs, D.getLTOMode() == LTOK_Thin, D);
551
552  if (Args.hasArg(options::OPT_Z_Xlinker__no_demangle))
553    CmdArgs.push_back("--no-demangle");
554
555  bool NeedsSanitizerDeps = addSanitizerRuntimes(ToolChain, Args, CmdArgs);
556  bool NeedsXRayDeps = addXRayRuntime(ToolChain, Args, CmdArgs);
557  AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);
558  // The profile runtime also needs access to system libraries.
559  getToolChain().addProfileRTLibs(Args, CmdArgs);
560
561  if (D.CCCIsCXX() &&
562      !Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
563    bool OnlyLibstdcxxStatic = Args.hasArg(options::OPT_static_libstdcxx) &&
564                               !Args.hasArg(options::OPT_static);
565    if (OnlyLibstdcxxStatic)
566      CmdArgs.push_back("-Bstatic");
567    ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
568    if (OnlyLibstdcxxStatic)
569      CmdArgs.push_back("-Bdynamic");
570    CmdArgs.push_back("-lm");
571  }
572  // Silence warnings when linking C code with a C++ '-stdlib' argument.
573  Args.ClaimAllArgs(options::OPT_stdlib_EQ);
574
575  if (!Args.hasArg(options::OPT_nostdlib)) {
576    if (!Args.hasArg(options::OPT_nodefaultlibs)) {
577      if (Args.hasArg(options::OPT_static))
578        CmdArgs.push_back("--start-group");
579
580      if (NeedsSanitizerDeps)
581        linkSanitizerRuntimeDeps(ToolChain, CmdArgs);
582
583      if (NeedsXRayDeps)
584        linkXRayRuntimeDeps(ToolChain, Args, CmdArgs);
585
586      bool WantPthread = Args.hasArg(options::OPT_pthread) ||
587                         Args.hasArg(options::OPT_pthreads);
588
589      // FIXME: Only pass GompNeedsRT = true for platforms with libgomp that
590      // require librt. Most modern Linux platforms do, but some may not.
591      if (addOpenMPRuntime(CmdArgs, ToolChain, Args,
592                           JA.isHostOffloading(Action::OFK_OpenMP),
593                           /* GompNeedsRT= */ true))
594        // OpenMP runtimes implies pthreads when using the GNU toolchain.
595        // FIXME: Does this really make sense for all GNU toolchains?
596        WantPthread = true;
597
598      AddRunTimeLibs(ToolChain, D, CmdArgs, Args);
599
600      if (WantPthread && !isAndroid)
601        CmdArgs.push_back("-lpthread");
602
603      if (Args.hasArg(options::OPT_fsplit_stack))
604        CmdArgs.push_back("--wrap=pthread_create");
605
606      CmdArgs.push_back("-lc");
607
608      // Add IAMCU specific libs, if needed.
609      if (IsIAMCU)
610        CmdArgs.push_back("-lgloss");
611
612      if (Args.hasArg(options::OPT_static))
613        CmdArgs.push_back("--end-group");
614      else
615        AddRunTimeLibs(ToolChain, D, CmdArgs, Args);
616
617      // Add IAMCU specific libs (outside the group), if needed.
618      if (IsIAMCU) {
619        CmdArgs.push_back("--as-needed");
620        CmdArgs.push_back("-lsoftfp");
621        CmdArgs.push_back("--no-as-needed");
622      }
623    }
624
625    if (!Args.hasArg(options::OPT_nostartfiles) && !IsIAMCU) {
626      const char *crtend;
627      if (Args.hasArg(options::OPT_shared))
628        crtend = isAndroid ? "crtend_so.o" : "crtendS.o";
629      else if (IsPIE)
630        crtend = isAndroid ? "crtend_android.o" : "crtendS.o";
631      else
632        crtend = isAndroid ? "crtend_android.o" : "crtend.o";
633
634      if (HasCRTBeginEndFiles)
635        CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtend)));
636      if (!isAndroid)
637        CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crtn.o")));
638    }
639  }
640
641  // Add OpenMP offloading linker script args if required.
642  AddOpenMPLinkerScript(getToolChain(), C, Output, Inputs, Args, CmdArgs, JA);
643
644  C.addCommand(llvm::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));
645}
646
647void tools::gnutools::Assembler::ConstructJob(Compilation &C,
648                                              const JobAction &JA,
649                                              const InputInfo &Output,
650                                              const InputInfoList &Inputs,
651                                              const ArgList &Args,
652                                              const char *LinkingOutput) const {
653  const auto &D = getToolChain().getDriver();
654
655  claimNoWarnArgs(Args);
656
657  ArgStringList CmdArgs;
658
659  llvm::Reloc::Model RelocationModel;
660  unsigned PICLevel;
661  bool IsPIE;
662  std::tie(RelocationModel, PICLevel, IsPIE) =
663      ParsePICArgs(getToolChain(), Args);
664
665  if (const Arg *A = Args.getLastArg(options::OPT_gz, options::OPT_gz_EQ)) {
666    if (A->getOption().getID() == options::OPT_gz) {
667      CmdArgs.push_back("-compress-debug-sections");
668    } else {
669      StringRef Value = A->getValue();
670      if (Value == "none") {
671        CmdArgs.push_back("-compress-debug-sections=none");
672      } else if (Value == "zlib" || Value == "zlib-gnu") {
673        CmdArgs.push_back(
674            Args.MakeArgString("-compress-debug-sections=" + Twine(Value)));
675      } else {
676        D.Diag(diag::err_drv_unsupported_option_argument)
677            << A->getOption().getName() << Value;
678      }
679    }
680  }
681
682  switch (getToolChain().getArch()) {
683  default:
684    break;
685  // Add --32/--64 to make sure we get the format we want.
686  // This is incomplete
687  case llvm::Triple::x86:
688    CmdArgs.push_back("--32");
689    break;
690  case llvm::Triple::x86_64:
691    if (getToolChain().getTriple().getEnvironment() == llvm::Triple::GNUX32)
692      CmdArgs.push_back("--x32");
693    else
694      CmdArgs.push_back("--64");
695    break;
696  case llvm::Triple::ppc:
697    CmdArgs.push_back("-a32");
698    CmdArgs.push_back("-mppc");
699    CmdArgs.push_back("-many");
700    break;
701  case llvm::Triple::ppc64:
702    CmdArgs.push_back("-a64");
703    CmdArgs.push_back("-mppc64");
704    CmdArgs.push_back("-many");
705    break;
706  case llvm::Triple::ppc64le:
707    CmdArgs.push_back("-a64");
708    CmdArgs.push_back("-mppc64");
709    CmdArgs.push_back("-many");
710    CmdArgs.push_back("-mlittle-endian");
711    break;
712  case llvm::Triple::sparc:
713  case llvm::Triple::sparcel: {
714    CmdArgs.push_back("-32");
715    std::string CPU = getCPUName(Args, getToolChain().getTriple());
716    CmdArgs.push_back(sparc::getSparcAsmModeForCPU(CPU, getToolChain().getTriple()));
717    AddAssemblerKPIC(getToolChain(), Args, CmdArgs);
718    break;
719  }
720  case llvm::Triple::sparcv9: {
721    CmdArgs.push_back("-64");
722    std::string CPU = getCPUName(Args, getToolChain().getTriple());
723    CmdArgs.push_back(sparc::getSparcAsmModeForCPU(CPU, getToolChain().getTriple()));
724    AddAssemblerKPIC(getToolChain(), Args, CmdArgs);
725    break;
726  }
727  case llvm::Triple::arm:
728  case llvm::Triple::armeb:
729  case llvm::Triple::thumb:
730  case llvm::Triple::thumbeb: {
731    const llvm::Triple &Triple2 = getToolChain().getTriple();
732    switch (Triple2.getSubArch()) {
733    case llvm::Triple::ARMSubArch_v7:
734      CmdArgs.push_back("-mfpu=neon");
735      break;
736    case llvm::Triple::ARMSubArch_v8:
737      CmdArgs.push_back("-mfpu=crypto-neon-fp-armv8");
738      break;
739    default:
740      break;
741    }
742
743    switch (arm::getARMFloatABI(getToolChain(), Args)) {
744    case arm::FloatABI::Invalid: llvm_unreachable("must have an ABI!");
745    case arm::FloatABI::Soft:
746      CmdArgs.push_back(Args.MakeArgString("-mfloat-abi=soft"));
747      break;
748    case arm::FloatABI::SoftFP:
749      CmdArgs.push_back(Args.MakeArgString("-mfloat-abi=softfp"));
750      break;
751    case arm::FloatABI::Hard:
752      CmdArgs.push_back(Args.MakeArgString("-mfloat-abi=hard"));
753      break;
754    }
755
756    Args.AddLastArg(CmdArgs, options::OPT_march_EQ);
757
758    // FIXME: remove krait check when GNU tools support krait cpu
759    // for now replace it with -mcpu=cortex-a15 to avoid a lower
760    // march from being picked in the absence of a cpu flag.
761    Arg *A;
762    if ((A = Args.getLastArg(options::OPT_mcpu_EQ)) &&
763        StringRef(A->getValue()).equals_lower("krait"))
764      CmdArgs.push_back("-mcpu=cortex-a15");
765    else
766      Args.AddLastArg(CmdArgs, options::OPT_mcpu_EQ);
767    Args.AddLastArg(CmdArgs, options::OPT_mfpu_EQ);
768    break;
769  }
770  case llvm::Triple::aarch64:
771  case llvm::Triple::aarch64_be: {
772    Args.AddLastArg(CmdArgs, options::OPT_march_EQ);
773    Args.AddLastArg(CmdArgs, options::OPT_mcpu_EQ);
774    break;
775  }
776  case llvm::Triple::mips:
777  case llvm::Triple::mipsel:
778  case llvm::Triple::mips64:
779  case llvm::Triple::mips64el: {
780    StringRef CPUName;
781    StringRef ABIName;
782    mips::getMipsCPUAndABI(Args, getToolChain().getTriple(), CPUName, ABIName);
783    ABIName = mips::getGnuCompatibleMipsABIName(ABIName);
784
785    CmdArgs.push_back("-march");
786    CmdArgs.push_back(CPUName.data());
787
788    CmdArgs.push_back("-mabi");
789    CmdArgs.push_back(ABIName.data());
790
791    // -mno-shared should be emitted unless -fpic, -fpie, -fPIC, -fPIE,
792    // or -mshared (not implemented) is in effect.
793    if (RelocationModel == llvm::Reloc::Static)
794      CmdArgs.push_back("-mno-shared");
795
796    // LLVM doesn't support -mplt yet and acts as if it is always given.
797    // However, -mplt has no effect with the N64 ABI.
798    if (ABIName != "64" && !Args.hasArg(options::OPT_mno_abicalls))
799      CmdArgs.push_back("-call_nonpic");
800
801    if (getToolChain().getArch() == llvm::Triple::mips ||
802        getToolChain().getArch() == llvm::Triple::mips64)
803      CmdArgs.push_back("-EB");
804    else
805      CmdArgs.push_back("-EL");
806
807    if (Arg *A = Args.getLastArg(options::OPT_mnan_EQ)) {
808      if (StringRef(A->getValue()) == "2008")
809        CmdArgs.push_back(Args.MakeArgString("-mnan=2008"));
810    }
811
812    // Add the last -mfp32/-mfpxx/-mfp64 or -mfpxx if it is enabled by default.
813    if (Arg *A = Args.getLastArg(options::OPT_mfp32, options::OPT_mfpxx,
814                                 options::OPT_mfp64)) {
815      A->claim();
816      A->render(Args, CmdArgs);
817    } else if (mips::shouldUseFPXX(
818                   Args, getToolChain().getTriple(), CPUName, ABIName,
819                   mips::getMipsFloatABI(getToolChain().getDriver(), Args)))
820      CmdArgs.push_back("-mfpxx");
821
822    // Pass on -mmips16 or -mno-mips16. However, the assembler equivalent of
823    // -mno-mips16 is actually -no-mips16.
824    if (Arg *A =
825            Args.getLastArg(options::OPT_mips16, options::OPT_mno_mips16)) {
826      if (A->getOption().matches(options::OPT_mips16)) {
827        A->claim();
828        A->render(Args, CmdArgs);
829      } else {
830        A->claim();
831        CmdArgs.push_back("-no-mips16");
832      }
833    }
834
835    Args.AddLastArg(CmdArgs, options::OPT_mmicromips,
836                    options::OPT_mno_micromips);
837    Args.AddLastArg(CmdArgs, options::OPT_mdsp, options::OPT_mno_dsp);
838    Args.AddLastArg(CmdArgs, options::OPT_mdspr2, options::OPT_mno_dspr2);
839
840    if (Arg *A = Args.getLastArg(options::OPT_mmsa, options::OPT_mno_msa)) {
841      // Do not use AddLastArg because not all versions of MIPS assembler
842      // support -mmsa / -mno-msa options.
843      if (A->getOption().matches(options::OPT_mmsa))
844        CmdArgs.push_back(Args.MakeArgString("-mmsa"));
845    }
846
847    Args.AddLastArg(CmdArgs, options::OPT_mhard_float,
848                    options::OPT_msoft_float);
849
850    Args.AddLastArg(CmdArgs, options::OPT_mdouble_float,
851                    options::OPT_msingle_float);
852
853    Args.AddLastArg(CmdArgs, options::OPT_modd_spreg,
854                    options::OPT_mno_odd_spreg);
855
856    AddAssemblerKPIC(getToolChain(), Args, CmdArgs);
857    break;
858  }
859  case llvm::Triple::systemz: {
860    // Always pass an -march option, since our default of z10 is later
861    // than the GNU assembler's default.
862    StringRef CPUName = systemz::getSystemZTargetCPU(Args);
863    CmdArgs.push_back(Args.MakeArgString("-march=" + CPUName));
864    break;
865  }
866  }
867
868  Args.AddAllArgs(CmdArgs, options::OPT_I);
869  Args.AddAllArgValues(CmdArgs, options::OPT_Wa_COMMA, options::OPT_Xassembler);
870
871  CmdArgs.push_back("-o");
872  CmdArgs.push_back(Output.getFilename());
873
874  for (const auto &II : Inputs)
875    CmdArgs.push_back(II.getFilename());
876
877  const char *Exec = Args.MakeArgString(getToolChain().GetProgramPath("as"));
878  C.addCommand(llvm::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));
879
880  // Handle the debug info splitting at object creation time if we're
881  // creating an object.
882  // TODO: Currently only works on linux with newer objcopy.
883  if (Args.hasArg(options::OPT_gsplit_dwarf) &&
884      getToolChain().getTriple().isOSLinux())
885    SplitDebugInfo(getToolChain(), C, *this, JA, Args, Output,
886                   SplitDebugName(Args, Inputs[0]));
887}
888
889namespace {
890// Filter to remove Multilibs that don't exist as a suffix to Path
891class FilterNonExistent {
892  StringRef Base, File;
893  vfs::FileSystem &VFS;
894
895public:
896  FilterNonExistent(StringRef Base, StringRef File, vfs::FileSystem &VFS)
897      : Base(Base), File(File), VFS(VFS) {}
898  bool operator()(const Multilib &M) {
899    return !VFS.exists(Base + M.gccSuffix() + File);
900  }
901};
902} // end anonymous namespace
903
904static bool isSoftFloatABI(const ArgList &Args) {
905  Arg *A = Args.getLastArg(options::OPT_msoft_float, options::OPT_mhard_float,
906                           options::OPT_mfloat_abi_EQ);
907  if (!A)
908    return false;
909
910  return A->getOption().matches(options::OPT_msoft_float) ||
911         (A->getOption().matches(options::OPT_mfloat_abi_EQ) &&
912          A->getValue() == StringRef("soft"));
913}
914
915/// \p Flag must be a flag accepted by the driver with its leading '-' removed,
916//     otherwise '-print-multi-lib' will not emit them correctly.
917static void addMultilibFlag(bool Enabled, const char *const Flag,
918                            std::vector<std::string> &Flags) {
919  if (Enabled)
920    Flags.push_back(std::string("+") + Flag);
921  else
922    Flags.push_back(std::string("-") + Flag);
923}
924
925static bool isArmOrThumbArch(llvm::Triple::ArchType Arch) {
926  return Arch == llvm::Triple::arm || Arch == llvm::Triple::thumb;
927}
928
929static bool isMips32(llvm::Triple::ArchType Arch) {
930  return Arch == llvm::Triple::mips || Arch == llvm::Triple::mipsel;
931}
932
933static bool isMips64(llvm::Triple::ArchType Arch) {
934  return Arch == llvm::Triple::mips64 || Arch == llvm::Triple::mips64el;
935}
936
937static bool isMipsEL(llvm::Triple::ArchType Arch) {
938  return Arch == llvm::Triple::mipsel || Arch == llvm::Triple::mips64el;
939}
940
941static bool isMips16(const ArgList &Args) {
942  Arg *A = Args.getLastArg(options::OPT_mips16, options::OPT_mno_mips16);
943  return A && A->getOption().matches(options::OPT_mips16);
944}
945
946static bool isMicroMips(const ArgList &Args) {
947  Arg *A = Args.getLastArg(options::OPT_mmicromips, options::OPT_mno_micromips);
948  return A && A->getOption().matches(options::OPT_mmicromips);
949}
950
951static Multilib makeMultilib(StringRef commonSuffix) {
952  return Multilib(commonSuffix, commonSuffix, commonSuffix);
953}
954
955static bool findMipsCsMultilibs(const Multilib::flags_list &Flags,
956                                FilterNonExistent &NonExistent,
957                                DetectedMultilibs &Result) {
958  // Check for Code Sourcery toolchain multilibs
959  MultilibSet CSMipsMultilibs;
960  {
961    auto MArchMips16 = makeMultilib("/mips16").flag("+m32").flag("+mips16");
962
963    auto MArchMicroMips =
964        makeMultilib("/micromips").flag("+m32").flag("+mmicromips");
965
966    auto MArchDefault = makeMultilib("").flag("-mips16").flag("-mmicromips");
967
968    auto UCLibc = makeMultilib("/uclibc").flag("+muclibc");
969
970    auto SoftFloat = makeMultilib("/soft-float").flag("+msoft-float");
971
972    auto Nan2008 = makeMultilib("/nan2008").flag("+mnan=2008");
973
974    auto DefaultFloat =
975        makeMultilib("").flag("-msoft-float").flag("-mnan=2008");
976
977    auto BigEndian = makeMultilib("").flag("+EB").flag("-EL");
978
979    auto LittleEndian = makeMultilib("/el").flag("+EL").flag("-EB");
980
981    // Note that this one's osSuffix is ""
982    auto MAbi64 = makeMultilib("")
983                      .gccSuffix("/64")
984                      .includeSuffix("/64")
985                      .flag("+mabi=n64")
986                      .flag("-mabi=n32")
987                      .flag("-m32");
988
989    CSMipsMultilibs =
990        MultilibSet()
991            .Either(MArchMips16, MArchMicroMips, MArchDefault)
992            .Maybe(UCLibc)
993            .Either(SoftFloat, Nan2008, DefaultFloat)
994            .FilterOut("/micromips/nan2008")
995            .FilterOut("/mips16/nan2008")
996            .Either(BigEndian, LittleEndian)
997            .Maybe(MAbi64)
998            .FilterOut("/mips16.*/64")
999            .FilterOut("/micromips.*/64")
1000            .FilterOut(NonExistent)
1001            .setIncludeDirsCallback([](const Multilib &M) {
1002              std::vector<std::string> Dirs({"/include"});
1003              if (StringRef(M.includeSuffix()).startswith("/uclibc"))
1004                Dirs.push_back(
1005                    "/../../../../mips-linux-gnu/libc/uclibc/usr/include");
1006              else
1007                Dirs.push_back("/../../../../mips-linux-gnu/libc/usr/include");
1008              return Dirs;
1009            });
1010  }
1011
1012  MultilibSet DebianMipsMultilibs;
1013  {
1014    Multilib MAbiN32 =
1015        Multilib().gccSuffix("/n32").includeSuffix("/n32").flag("+mabi=n32");
1016
1017    Multilib M64 = Multilib()
1018                       .gccSuffix("/64")
1019                       .includeSuffix("/64")
1020                       .flag("+m64")
1021                       .flag("-m32")
1022                       .flag("-mabi=n32");
1023
1024    Multilib M32 = Multilib().flag("-m64").flag("+m32").flag("-mabi=n32");
1025
1026    DebianMipsMultilibs =
1027        MultilibSet().Either(M32, M64, MAbiN32).FilterOut(NonExistent);
1028  }
1029
1030  // Sort candidates. Toolchain that best meets the directories tree goes first.
1031  // Then select the first toolchains matches command line flags.
1032  MultilibSet *Candidates[] = {&CSMipsMultilibs, &DebianMipsMultilibs};
1033  if (CSMipsMultilibs.size() < DebianMipsMultilibs.size())
1034    std::iter_swap(Candidates, Candidates + 1);
1035  for (const MultilibSet *Candidate : Candidates) {
1036    if (Candidate->select(Flags, Result.SelectedMultilib)) {
1037      if (Candidate == &DebianMipsMultilibs)
1038        Result.BiarchSibling = Multilib();
1039      Result.Multilibs = *Candidate;
1040      return true;
1041    }
1042  }
1043  return false;
1044}
1045
1046static bool findMipsAndroidMultilibs(vfs::FileSystem &VFS, StringRef Path,
1047                                     const Multilib::flags_list &Flags,
1048                                     FilterNonExistent &NonExistent,
1049                                     DetectedMultilibs &Result) {
1050
1051  MultilibSet AndroidMipsMultilibs =
1052      MultilibSet()
1053          .Maybe(Multilib("/mips-r2").flag("+march=mips32r2"))
1054          .Maybe(Multilib("/mips-r6").flag("+march=mips32r6"))
1055          .FilterOut(NonExistent);
1056
1057  MultilibSet AndroidMipselMultilibs =
1058      MultilibSet()
1059          .Either(Multilib().flag("+march=mips32"),
1060                  Multilib("/mips-r2", "", "/mips-r2").flag("+march=mips32r2"),
1061                  Multilib("/mips-r6", "", "/mips-r6").flag("+march=mips32r6"))
1062          .FilterOut(NonExistent);
1063
1064  MultilibSet AndroidMips64elMultilibs =
1065      MultilibSet()
1066          .Either(
1067              Multilib().flag("+march=mips64r6"),
1068              Multilib("/32/mips-r1", "", "/mips-r1").flag("+march=mips32"),
1069              Multilib("/32/mips-r2", "", "/mips-r2").flag("+march=mips32r2"),
1070              Multilib("/32/mips-r6", "", "/mips-r6").flag("+march=mips32r6"))
1071          .FilterOut(NonExistent);
1072
1073  MultilibSet *MS = &AndroidMipsMultilibs;
1074  if (VFS.exists(Path + "/mips-r6"))
1075    MS = &AndroidMipselMultilibs;
1076  else if (VFS.exists(Path + "/32"))
1077    MS = &AndroidMips64elMultilibs;
1078  if (MS->select(Flags, Result.SelectedMultilib)) {
1079    Result.Multilibs = *MS;
1080    return true;
1081  }
1082  return false;
1083}
1084
1085static bool findMipsMuslMultilibs(const Multilib::flags_list &Flags,
1086                                  FilterNonExistent &NonExistent,
1087                                  DetectedMultilibs &Result) {
1088  // Musl toolchain multilibs
1089  MultilibSet MuslMipsMultilibs;
1090  {
1091    auto MArchMipsR2 = makeMultilib("")
1092                           .osSuffix("/mips-r2-hard-musl")
1093                           .flag("+EB")
1094                           .flag("-EL")
1095                           .flag("+march=mips32r2");
1096
1097    auto MArchMipselR2 = makeMultilib("/mipsel-r2-hard-musl")
1098                             .flag("-EB")
1099                             .flag("+EL")
1100                             .flag("+march=mips32r2");
1101
1102    MuslMipsMultilibs = MultilibSet().Either(MArchMipsR2, MArchMipselR2);
1103
1104    // Specify the callback that computes the include directories.
1105    MuslMipsMultilibs.setIncludeDirsCallback([](const Multilib &M) {
1106      return std::vector<std::string>(
1107          {"/../sysroot" + M.osSuffix() + "/usr/include"});
1108    });
1109  }
1110  if (MuslMipsMultilibs.select(Flags, Result.SelectedMultilib)) {
1111    Result.Multilibs = MuslMipsMultilibs;
1112    return true;
1113  }
1114  return false;
1115}
1116
1117static bool findMipsMtiMultilibs(const Multilib::flags_list &Flags,
1118                                 FilterNonExistent &NonExistent,
1119                                 DetectedMultilibs &Result) {
1120  // CodeScape MTI toolchain v1.2 and early.
1121  MultilibSet MtiMipsMultilibsV1;
1122  {
1123    auto MArchMips32 = makeMultilib("/mips32")
1124                           .flag("+m32")
1125                           .flag("-m64")
1126                           .flag("-mmicromips")
1127                           .flag("+march=mips32");
1128
1129    auto MArchMicroMips = makeMultilib("/micromips")
1130                              .flag("+m32")
1131                              .flag("-m64")
1132                              .flag("+mmicromips");
1133
1134    auto MArchMips64r2 = makeMultilib("/mips64r2")
1135                             .flag("-m32")
1136                             .flag("+m64")
1137                             .flag("+march=mips64r2");
1138
1139    auto MArchMips64 = makeMultilib("/mips64").flag("-m32").flag("+m64").flag(
1140        "-march=mips64r2");
1141
1142    auto MArchDefault = makeMultilib("")
1143                            .flag("+m32")
1144                            .flag("-m64")
1145                            .flag("-mmicromips")
1146                            .flag("+march=mips32r2");
1147
1148    auto Mips16 = makeMultilib("/mips16").flag("+mips16");
1149
1150    auto UCLibc = makeMultilib("/uclibc").flag("+muclibc");
1151
1152    auto MAbi64 =
1153        makeMultilib("/64").flag("+mabi=n64").flag("-mabi=n32").flag("-m32");
1154
1155    auto BigEndian = makeMultilib("").flag("+EB").flag("-EL");
1156
1157    auto LittleEndian = makeMultilib("/el").flag("+EL").flag("-EB");
1158
1159    auto SoftFloat = makeMultilib("/sof").flag("+msoft-float");
1160
1161    auto Nan2008 = makeMultilib("/nan2008").flag("+mnan=2008");
1162
1163    MtiMipsMultilibsV1 =
1164        MultilibSet()
1165            .Either(MArchMips32, MArchMicroMips, MArchMips64r2, MArchMips64,
1166                    MArchDefault)
1167            .Maybe(UCLibc)
1168            .Maybe(Mips16)
1169            .FilterOut("/mips64/mips16")
1170            .FilterOut("/mips64r2/mips16")
1171            .FilterOut("/micromips/mips16")
1172            .Maybe(MAbi64)
1173            .FilterOut("/micromips/64")
1174            .FilterOut("/mips32/64")
1175            .FilterOut("^/64")
1176            .FilterOut("/mips16/64")
1177            .Either(BigEndian, LittleEndian)
1178            .Maybe(SoftFloat)
1179            .Maybe(Nan2008)
1180            .FilterOut(".*sof/nan2008")
1181            .FilterOut(NonExistent)
1182            .setIncludeDirsCallback([](const Multilib &M) {
1183              std::vector<std::string> Dirs({"/include"});
1184              if (StringRef(M.includeSuffix()).startswith("/uclibc"))
1185                Dirs.push_back("/../../../../sysroot/uclibc/usr/include");
1186              else
1187                Dirs.push_back("/../../../../sysroot/usr/include");
1188              return Dirs;
1189            });
1190  }
1191
1192  // CodeScape IMG toolchain starting from v1.3.
1193  MultilibSet MtiMipsMultilibsV2;
1194  {
1195    auto BeHard = makeMultilib("/mips-r2-hard")
1196                      .flag("+EB")
1197                      .flag("-msoft-float")
1198                      .flag("-mnan=2008")
1199                      .flag("-muclibc");
1200    auto BeSoft = makeMultilib("/mips-r2-soft")
1201                      .flag("+EB")
1202                      .flag("+msoft-float")
1203                      .flag("-mnan=2008");
1204    auto ElHard = makeMultilib("/mipsel-r2-hard")
1205                      .flag("+EL")
1206                      .flag("-msoft-float")
1207                      .flag("-mnan=2008")
1208                      .flag("-muclibc");
1209    auto ElSoft = makeMultilib("/mipsel-r2-soft")
1210                      .flag("+EL")
1211                      .flag("+msoft-float")
1212                      .flag("-mnan=2008")
1213                      .flag("-mmicromips");
1214    auto BeHardNan = makeMultilib("/mips-r2-hard-nan2008")
1215                         .flag("+EB")
1216                         .flag("-msoft-float")
1217                         .flag("+mnan=2008")
1218                         .flag("-muclibc");
1219    auto ElHardNan = makeMultilib("/mipsel-r2-hard-nan2008")
1220                         .flag("+EL")
1221                         .flag("-msoft-float")
1222                         .flag("+mnan=2008")
1223                         .flag("-muclibc")
1224                         .flag("-mmicromips");
1225    auto BeHardNanUclibc = makeMultilib("/mips-r2-hard-nan2008-uclibc")
1226                               .flag("+EB")
1227                               .flag("-msoft-float")
1228                               .flag("+mnan=2008")
1229                               .flag("+muclibc");
1230    auto ElHardNanUclibc = makeMultilib("/mipsel-r2-hard-nan2008-uclibc")
1231                               .flag("+EL")
1232                               .flag("-msoft-float")
1233                               .flag("+mnan=2008")
1234                               .flag("+muclibc");
1235    auto BeHardUclibc = makeMultilib("/mips-r2-hard-uclibc")
1236                            .flag("+EB")
1237                            .flag("-msoft-float")
1238                            .flag("-mnan=2008")
1239                            .flag("+muclibc");
1240    auto ElHardUclibc = makeMultilib("/mipsel-r2-hard-uclibc")
1241                            .flag("+EL")
1242                            .flag("-msoft-float")
1243                            .flag("-mnan=2008")
1244                            .flag("+muclibc");
1245    auto ElMicroHardNan = makeMultilib("/micromipsel-r2-hard-nan2008")
1246                              .flag("+EL")
1247                              .flag("-msoft-float")
1248                              .flag("+mnan=2008")
1249                              .flag("+mmicromips");
1250    auto ElMicroSoft = makeMultilib("/micromipsel-r2-soft")
1251                           .flag("+EL")
1252                           .flag("+msoft-float")
1253                           .flag("-mnan=2008")
1254                           .flag("+mmicromips");
1255
1256    auto O32 =
1257        makeMultilib("/lib").osSuffix("").flag("-mabi=n32").flag("-mabi=n64");
1258    auto N32 =
1259        makeMultilib("/lib32").osSuffix("").flag("+mabi=n32").flag("-mabi=n64");
1260    auto N64 =
1261        makeMultilib("/lib64").osSuffix("").flag("-mabi=n32").flag("+mabi=n64");
1262
1263    MtiMipsMultilibsV2 =
1264        MultilibSet()
1265            .Either({BeHard, BeSoft, ElHard, ElSoft, BeHardNan, ElHardNan,
1266                     BeHardNanUclibc, ElHardNanUclibc, BeHardUclibc,
1267                     ElHardUclibc, ElMicroHardNan, ElMicroSoft})
1268            .Either(O32, N32, N64)
1269            .FilterOut(NonExistent)
1270            .setIncludeDirsCallback([](const Multilib &M) {
1271              return std::vector<std::string>({"/../../../../sysroot" +
1272                                               M.includeSuffix() +
1273                                               "/../usr/include"});
1274            })
1275            .setFilePathsCallback([](const Multilib &M) {
1276              return std::vector<std::string>(
1277                  {"/../../../../mips-mti-linux-gnu/lib" + M.gccSuffix()});
1278            });
1279  }
1280  for (auto Candidate : {&MtiMipsMultilibsV1, &MtiMipsMultilibsV2}) {
1281    if (Candidate->select(Flags, Result.SelectedMultilib)) {
1282      Result.Multilibs = *Candidate;
1283      return true;
1284    }
1285  }
1286  return false;
1287}
1288
1289static bool findMipsImgMultilibs(const Multilib::flags_list &Flags,
1290                                 FilterNonExistent &NonExistent,
1291                                 DetectedMultilibs &Result) {
1292  // CodeScape IMG toolchain v1.2 and early.
1293  MultilibSet ImgMultilibsV1;
1294  {
1295    auto Mips64r6 = makeMultilib("/mips64r6").flag("+m64").flag("-m32");
1296
1297    auto LittleEndian = makeMultilib("/el").flag("+EL").flag("-EB");
1298
1299    auto MAbi64 =
1300        makeMultilib("/64").flag("+mabi=n64").flag("-mabi=n32").flag("-m32");
1301
1302    ImgMultilibsV1 =
1303        MultilibSet()
1304            .Maybe(Mips64r6)
1305            .Maybe(MAbi64)
1306            .Maybe(LittleEndian)
1307            .FilterOut(NonExistent)
1308            .setIncludeDirsCallback([](const Multilib &M) {
1309              return std::vector<std::string>(
1310                  {"/include", "/../../../../sysroot/usr/include"});
1311            });
1312  }
1313
1314  // CodeScape IMG toolchain starting from v1.3.
1315  MultilibSet ImgMultilibsV2;
1316  {
1317    auto BeHard = makeMultilib("/mips-r6-hard")
1318                      .flag("+EB")
1319                      .flag("-msoft-float")
1320                      .flag("-mmicromips");
1321    auto BeSoft = makeMultilib("/mips-r6-soft")
1322                      .flag("+EB")
1323                      .flag("+msoft-float")
1324                      .flag("-mmicromips");
1325    auto ElHard = makeMultilib("/mipsel-r6-hard")
1326                      .flag("+EL")
1327                      .flag("-msoft-float")
1328                      .flag("-mmicromips");
1329    auto ElSoft = makeMultilib("/mipsel-r6-soft")
1330                      .flag("+EL")
1331                      .flag("+msoft-float")
1332                      .flag("-mmicromips");
1333    auto BeMicroHard = makeMultilib("/micromips-r6-hard")
1334                           .flag("+EB")
1335                           .flag("-msoft-float")
1336                           .flag("+mmicromips");
1337    auto BeMicroSoft = makeMultilib("/micromips-r6-soft")
1338                           .flag("+EB")
1339                           .flag("+msoft-float")
1340                           .flag("+mmicromips");
1341    auto ElMicroHard = makeMultilib("/micromipsel-r6-hard")
1342                           .flag("+EL")
1343                           .flag("-msoft-float")
1344                           .flag("+mmicromips");
1345    auto ElMicroSoft = makeMultilib("/micromipsel-r6-soft")
1346                           .flag("+EL")
1347                           .flag("+msoft-float")
1348                           .flag("+mmicromips");
1349
1350    auto O32 =
1351        makeMultilib("/lib").osSuffix("").flag("-mabi=n32").flag("-mabi=n64");
1352    auto N32 =
1353        makeMultilib("/lib32").osSuffix("").flag("+mabi=n32").flag("-mabi=n64");
1354    auto N64 =
1355        makeMultilib("/lib64").osSuffix("").flag("-mabi=n32").flag("+mabi=n64");
1356
1357    ImgMultilibsV2 =
1358        MultilibSet()
1359            .Either({BeHard, BeSoft, ElHard, ElSoft, BeMicroHard, BeMicroSoft,
1360                     ElMicroHard, ElMicroSoft})
1361            .Either(O32, N32, N64)
1362            .FilterOut(NonExistent)
1363            .setIncludeDirsCallback([](const Multilib &M) {
1364              return std::vector<std::string>({"/../../../../sysroot" +
1365                                               M.includeSuffix() +
1366                                               "/../usr/include"});
1367            })
1368            .setFilePathsCallback([](const Multilib &M) {
1369              return std::vector<std::string>(
1370                  {"/../../../../mips-img-linux-gnu/lib" + M.gccSuffix()});
1371            });
1372  }
1373  for (auto Candidate : {&ImgMultilibsV1, &ImgMultilibsV2}) {
1374    if (Candidate->select(Flags, Result.SelectedMultilib)) {
1375      Result.Multilibs = *Candidate;
1376      return true;
1377    }
1378  }
1379  return false;
1380}
1381
1382bool clang::driver::findMIPSMultilibs(const Driver &D,
1383                                      const llvm::Triple &TargetTriple,
1384                                      StringRef Path, const ArgList &Args,
1385                                      DetectedMultilibs &Result) {
1386  FilterNonExistent NonExistent(Path, "/crtbegin.o", D.getVFS());
1387
1388  StringRef CPUName;
1389  StringRef ABIName;
1390  tools::mips::getMipsCPUAndABI(Args, TargetTriple, CPUName, ABIName);
1391
1392  llvm::Triple::ArchType TargetArch = TargetTriple.getArch();
1393
1394  Multilib::flags_list Flags;
1395  addMultilibFlag(isMips32(TargetArch), "m32", Flags);
1396  addMultilibFlag(isMips64(TargetArch), "m64", Flags);
1397  addMultilibFlag(isMips16(Args), "mips16", Flags);
1398  addMultilibFlag(CPUName == "mips32", "march=mips32", Flags);
1399  addMultilibFlag(CPUName == "mips32r2" || CPUName == "mips32r3" ||
1400                      CPUName == "mips32r5" || CPUName == "p5600",
1401                  "march=mips32r2", Flags);
1402  addMultilibFlag(CPUName == "mips32r6", "march=mips32r6", Flags);
1403  addMultilibFlag(CPUName == "mips64", "march=mips64", Flags);
1404  addMultilibFlag(CPUName == "mips64r2" || CPUName == "mips64r3" ||
1405                      CPUName == "mips64r5" || CPUName == "octeon",
1406                  "march=mips64r2", Flags);
1407  addMultilibFlag(CPUName == "mips64r6", "march=mips64r6", Flags);
1408  addMultilibFlag(isMicroMips(Args), "mmicromips", Flags);
1409  addMultilibFlag(tools::mips::isUCLibc(Args), "muclibc", Flags);
1410  addMultilibFlag(tools::mips::isNaN2008(Args, TargetTriple), "mnan=2008",
1411                  Flags);
1412  addMultilibFlag(ABIName == "n32", "mabi=n32", Flags);
1413  addMultilibFlag(ABIName == "n64", "mabi=n64", Flags);
1414  addMultilibFlag(isSoftFloatABI(Args), "msoft-float", Flags);
1415  addMultilibFlag(!isSoftFloatABI(Args), "mhard-float", Flags);
1416  addMultilibFlag(isMipsEL(TargetArch), "EL", Flags);
1417  addMultilibFlag(!isMipsEL(TargetArch), "EB", Flags);
1418
1419  if (TargetTriple.isAndroid())
1420    return findMipsAndroidMultilibs(D.getVFS(), Path, Flags, NonExistent,
1421                                    Result);
1422
1423  if (TargetTriple.getVendor() == llvm::Triple::MipsTechnologies &&
1424      TargetTriple.getOS() == llvm::Triple::Linux &&
1425      TargetTriple.getEnvironment() == llvm::Triple::UnknownEnvironment)
1426    return findMipsMuslMultilibs(Flags, NonExistent, Result);
1427
1428  if (TargetTriple.getVendor() == llvm::Triple::MipsTechnologies &&
1429      TargetTriple.getOS() == llvm::Triple::Linux &&
1430      TargetTriple.getEnvironment() == llvm::Triple::GNU)
1431    return findMipsMtiMultilibs(Flags, NonExistent, Result);
1432
1433  if (TargetTriple.getVendor() == llvm::Triple::ImaginationTechnologies &&
1434      TargetTriple.getOS() == llvm::Triple::Linux &&
1435      TargetTriple.getEnvironment() == llvm::Triple::GNU)
1436    return findMipsImgMultilibs(Flags, NonExistent, Result);
1437
1438  if (findMipsCsMultilibs(Flags, NonExistent, Result))
1439    return true;
1440
1441  // Fallback to the regular toolchain-tree structure.
1442  Multilib Default;
1443  Result.Multilibs.push_back(Default);
1444  Result.Multilibs.FilterOut(NonExistent);
1445
1446  if (Result.Multilibs.select(Flags, Result.SelectedMultilib)) {
1447    Result.BiarchSibling = Multilib();
1448    return true;
1449  }
1450
1451  return false;
1452}
1453
1454static void findAndroidArmMultilibs(const Driver &D,
1455                                    const llvm::Triple &TargetTriple,
1456                                    StringRef Path, const ArgList &Args,
1457                                    DetectedMultilibs &Result) {
1458  // Find multilibs with subdirectories like armv7-a, thumb, armv7-a/thumb.
1459  FilterNonExistent NonExistent(Path, "/crtbegin.o", D.getVFS());
1460  Multilib ArmV7Multilib = makeMultilib("/armv7-a")
1461                               .flag("+march=armv7-a")
1462                               .flag("-mthumb");
1463  Multilib ThumbMultilib = makeMultilib("/thumb")
1464                               .flag("-march=armv7-a")
1465                               .flag("+mthumb");
1466  Multilib ArmV7ThumbMultilib = makeMultilib("/armv7-a/thumb")
1467                               .flag("+march=armv7-a")
1468                               .flag("+mthumb");
1469  Multilib DefaultMultilib = makeMultilib("")
1470                               .flag("-march=armv7-a")
1471                               .flag("-mthumb");
1472  MultilibSet AndroidArmMultilibs =
1473      MultilibSet()
1474          .Either(ThumbMultilib, ArmV7Multilib,
1475                  ArmV7ThumbMultilib, DefaultMultilib)
1476          .FilterOut(NonExistent);
1477
1478  Multilib::flags_list Flags;
1479  llvm::StringRef Arch = Args.getLastArgValue(options::OPT_march_EQ);
1480  bool IsArmArch = TargetTriple.getArch() == llvm::Triple::arm;
1481  bool IsThumbArch = TargetTriple.getArch() == llvm::Triple::thumb;
1482  bool IsV7SubArch = TargetTriple.getSubArch() == llvm::Triple::ARMSubArch_v7;
1483  bool IsThumbMode = IsThumbArch ||
1484      Args.hasFlag(options::OPT_mthumb, options::OPT_mno_thumb, false) ||
1485      (IsArmArch && llvm::ARM::parseArchISA(Arch) == llvm::ARM::IK_THUMB);
1486  bool IsArmV7Mode = (IsArmArch || IsThumbArch) &&
1487      (llvm::ARM::parseArchVersion(Arch) == 7 ||
1488       (IsArmArch && Arch == "" && IsV7SubArch));
1489  addMultilibFlag(IsArmV7Mode, "march=armv7-a", Flags);
1490  addMultilibFlag(IsThumbMode, "mthumb", Flags);
1491
1492  if (AndroidArmMultilibs.select(Flags, Result.SelectedMultilib))
1493    Result.Multilibs = AndroidArmMultilibs;
1494}
1495
1496static bool findBiarchMultilibs(const Driver &D,
1497                                const llvm::Triple &TargetTriple,
1498                                StringRef Path, const ArgList &Args,
1499                                bool NeedsBiarchSuffix,
1500                                DetectedMultilibs &Result) {
1501  // Some versions of SUSE and Fedora on ppc64 put 32-bit libs
1502  // in what would normally be GCCInstallPath and put the 64-bit
1503  // libs in a subdirectory named 64. The simple logic we follow is that
1504  // *if* there is a subdirectory of the right name with crtbegin.o in it,
1505  // we use that. If not, and if not a biarch triple alias, we look for
1506  // crtbegin.o without the subdirectory.
1507
1508  Multilib Default;
1509  Multilib Alt64 = Multilib()
1510                       .gccSuffix("/64")
1511                       .includeSuffix("/64")
1512                       .flag("-m32")
1513                       .flag("+m64")
1514                       .flag("-mx32");
1515  Multilib Alt32 = Multilib()
1516                       .gccSuffix("/32")
1517                       .includeSuffix("/32")
1518                       .flag("+m32")
1519                       .flag("-m64")
1520                       .flag("-mx32");
1521  Multilib Altx32 = Multilib()
1522                        .gccSuffix("/x32")
1523                        .includeSuffix("/x32")
1524                        .flag("-m32")
1525                        .flag("-m64")
1526                        .flag("+mx32");
1527
1528  // GCC toolchain for IAMCU doesn't have crtbegin.o, so look for libgcc.a.
1529  FilterNonExistent NonExistent(
1530      Path, TargetTriple.isOSIAMCU() ? "/libgcc.a" : "/crtbegin.o", D.getVFS());
1531
1532  // Determine default multilib from: 32, 64, x32
1533  // Also handle cases such as 64 on 32, 32 on 64, etc.
1534  enum { UNKNOWN, WANT32, WANT64, WANTX32 } Want = UNKNOWN;
1535  const bool IsX32 = TargetTriple.getEnvironment() == llvm::Triple::GNUX32;
1536  if (TargetTriple.isArch32Bit() && !NonExistent(Alt32))
1537    Want = WANT64;
1538  else if (TargetTriple.isArch64Bit() && IsX32 && !NonExistent(Altx32))
1539    Want = WANT64;
1540  else if (TargetTriple.isArch64Bit() && !IsX32 && !NonExistent(Alt64))
1541    Want = WANT32;
1542  else {
1543    if (TargetTriple.isArch32Bit())
1544      Want = NeedsBiarchSuffix ? WANT64 : WANT32;
1545    else if (IsX32)
1546      Want = NeedsBiarchSuffix ? WANT64 : WANTX32;
1547    else
1548      Want = NeedsBiarchSuffix ? WANT32 : WANT64;
1549  }
1550
1551  if (Want == WANT32)
1552    Default.flag("+m32").flag("-m64").flag("-mx32");
1553  else if (Want == WANT64)
1554    Default.flag("-m32").flag("+m64").flag("-mx32");
1555  else if (Want == WANTX32)
1556    Default.flag("-m32").flag("-m64").flag("+mx32");
1557  else
1558    return false;
1559
1560  Result.Multilibs.push_back(Default);
1561  Result.Multilibs.push_back(Alt64);
1562  Result.Multilibs.push_back(Alt32);
1563  Result.Multilibs.push_back(Altx32);
1564
1565  Result.Multilibs.FilterOut(NonExistent);
1566
1567  Multilib::flags_list Flags;
1568  addMultilibFlag(TargetTriple.isArch64Bit() && !IsX32, "m64", Flags);
1569  addMultilibFlag(TargetTriple.isArch32Bit(), "m32", Flags);
1570  addMultilibFlag(TargetTriple.isArch64Bit() && IsX32, "mx32", Flags);
1571
1572  if (!Result.Multilibs.select(Flags, Result.SelectedMultilib))
1573    return false;
1574
1575  if (Result.SelectedMultilib == Alt64 || Result.SelectedMultilib == Alt32 ||
1576      Result.SelectedMultilib == Altx32)
1577    Result.BiarchSibling = Default;
1578
1579  return true;
1580}
1581
1582/// Generic_GCC - A tool chain using the 'gcc' command to perform
1583/// all subcommands; this relies on gcc translating the majority of
1584/// command line options.
1585
1586/// \brief Less-than for GCCVersion, implementing a Strict Weak Ordering.
1587bool Generic_GCC::GCCVersion::isOlderThan(int RHSMajor, int RHSMinor,
1588                                          int RHSPatch,
1589                                          StringRef RHSPatchSuffix) const {
1590  if (Major != RHSMajor)
1591    return Major < RHSMajor;
1592  if (Minor != RHSMinor)
1593    return Minor < RHSMinor;
1594  if (Patch != RHSPatch) {
1595    // Note that versions without a specified patch sort higher than those with
1596    // a patch.
1597    if (RHSPatch == -1)
1598      return true;
1599    if (Patch == -1)
1600      return false;
1601
1602    // Otherwise just sort on the patch itself.
1603    return Patch < RHSPatch;
1604  }
1605  if (PatchSuffix != RHSPatchSuffix) {
1606    // Sort empty suffixes higher.
1607    if (RHSPatchSuffix.empty())
1608      return true;
1609    if (PatchSuffix.empty())
1610      return false;
1611
1612    // Provide a lexicographic sort to make this a total ordering.
1613    return PatchSuffix < RHSPatchSuffix;
1614  }
1615
1616  // The versions are equal.
1617  return false;
1618}
1619
1620/// \brief Parse a GCCVersion object out of a string of text.
1621///
1622/// This is the primary means of forming GCCVersion objects.
1623/*static*/
1624Generic_GCC::GCCVersion Generic_GCC::GCCVersion::Parse(StringRef VersionText) {
1625  const GCCVersion BadVersion = {VersionText.str(), -1, -1, -1, "", "", ""};
1626  std::pair<StringRef, StringRef> First = VersionText.split('.');
1627  std::pair<StringRef, StringRef> Second = First.second.split('.');
1628
1629  GCCVersion GoodVersion = {VersionText.str(), -1, -1, -1, "", "", ""};
1630  if (First.first.getAsInteger(10, GoodVersion.Major) || GoodVersion.Major < 0)
1631    return BadVersion;
1632  GoodVersion.MajorStr = First.first.str();
1633  if (First.second.empty())
1634    return GoodVersion;
1635  if (Second.first.getAsInteger(10, GoodVersion.Minor) || GoodVersion.Minor < 0)
1636    return BadVersion;
1637  GoodVersion.MinorStr = Second.first.str();
1638
1639  // First look for a number prefix and parse that if present. Otherwise just
1640  // stash the entire patch string in the suffix, and leave the number
1641  // unspecified. This covers versions strings such as:
1642  //   5        (handled above)
1643  //   4.4
1644  //   4.4.0
1645  //   4.4.x
1646  //   4.4.2-rc4
1647  //   4.4.x-patched
1648  // And retains any patch number it finds.
1649  StringRef PatchText = GoodVersion.PatchSuffix = Second.second.str();
1650  if (!PatchText.empty()) {
1651    if (size_t EndNumber = PatchText.find_first_not_of("0123456789")) {
1652      // Try to parse the number and any suffix.
1653      if (PatchText.slice(0, EndNumber).getAsInteger(10, GoodVersion.Patch) ||
1654          GoodVersion.Patch < 0)
1655        return BadVersion;
1656      GoodVersion.PatchSuffix = PatchText.substr(EndNumber);
1657    }
1658  }
1659
1660  return GoodVersion;
1661}
1662
1663static llvm::StringRef getGCCToolchainDir(const ArgList &Args) {
1664  const Arg *A = Args.getLastArg(clang::driver::options::OPT_gcc_toolchain);
1665  if (A)
1666    return A->getValue();
1667  return GCC_INSTALL_PREFIX;
1668}
1669
1670/// \brief Initialize a GCCInstallationDetector from the driver.
1671///
1672/// This performs all of the autodetection and sets up the various paths.
1673/// Once constructed, a GCCInstallationDetector is essentially immutable.
1674///
1675/// FIXME: We shouldn't need an explicit TargetTriple parameter here, and
1676/// should instead pull the target out of the driver. This is currently
1677/// necessary because the driver doesn't store the final version of the target
1678/// triple.
1679void Generic_GCC::GCCInstallationDetector::init(
1680    const llvm::Triple &TargetTriple, const ArgList &Args,
1681    ArrayRef<std::string> ExtraTripleAliases) {
1682  llvm::Triple BiarchVariantTriple = TargetTriple.isArch32Bit()
1683                                         ? TargetTriple.get64BitArchVariant()
1684                                         : TargetTriple.get32BitArchVariant();
1685  // The library directories which may contain GCC installations.
1686  SmallVector<StringRef, 4> CandidateLibDirs, CandidateBiarchLibDirs;
1687  // The compatible GCC triples for this particular architecture.
1688  SmallVector<StringRef, 16> CandidateTripleAliases;
1689  SmallVector<StringRef, 16> CandidateBiarchTripleAliases;
1690  CollectLibDirsAndTriples(TargetTriple, BiarchVariantTriple, CandidateLibDirs,
1691                           CandidateTripleAliases, CandidateBiarchLibDirs,
1692                           CandidateBiarchTripleAliases);
1693
1694  // Compute the set of prefixes for our search.
1695  SmallVector<std::string, 8> Prefixes(D.PrefixDirs.begin(),
1696                                       D.PrefixDirs.end());
1697
1698  StringRef GCCToolchainDir = getGCCToolchainDir(Args);
1699  if (GCCToolchainDir != "") {
1700    if (GCCToolchainDir.back() == '/')
1701      GCCToolchainDir = GCCToolchainDir.drop_back(); // remove the /
1702
1703    Prefixes.push_back(GCCToolchainDir);
1704  } else {
1705    // If we have a SysRoot, try that first.
1706    if (!D.SysRoot.empty()) {
1707      Prefixes.push_back(D.SysRoot);
1708      Prefixes.push_back(D.SysRoot + "/usr");
1709    }
1710
1711    // Then look for gcc installed alongside clang.
1712    Prefixes.push_back(D.InstalledDir + "/..");
1713
1714    // Then look for distribution supplied gcc installations.
1715    if (D.SysRoot.empty()) {
1716      // Look for RHEL devtoolsets.
1717      Prefixes.push_back("/opt/rh/devtoolset-6/root/usr");
1718      Prefixes.push_back("/opt/rh/devtoolset-4/root/usr");
1719      Prefixes.push_back("/opt/rh/devtoolset-3/root/usr");
1720      Prefixes.push_back("/opt/rh/devtoolset-2/root/usr");
1721      // And finally in /usr.
1722      Prefixes.push_back("/usr");
1723    }
1724  }
1725
1726  // Try to respect gcc-config on Gentoo. However, do that only
1727  // if --gcc-toolchain is not provided or equal to the Gentoo install
1728  // in /usr. This avoids accidentally enforcing the system GCC version
1729  // when using a custom toolchain.
1730  if (GCCToolchainDir == "" || GCCToolchainDir == D.SysRoot + "/usr") {
1731    for (StringRef CandidateTriple : ExtraTripleAliases) {
1732      if (ScanGentooGccConfig(TargetTriple, Args, CandidateTriple))
1733        return;
1734    }
1735    for (StringRef CandidateTriple : CandidateTripleAliases) {
1736      if (ScanGentooGccConfig(TargetTriple, Args, CandidateTriple))
1737        return;
1738    }
1739    for (StringRef CandidateTriple : CandidateBiarchTripleAliases) {
1740      if (ScanGentooGccConfig(TargetTriple, Args, CandidateTriple, true))
1741        return;
1742    }
1743  }
1744
1745  // Loop over the various components which exist and select the best GCC
1746  // installation available. GCC installs are ranked by version number.
1747  Version = GCCVersion::Parse("0.0.0");
1748  for (const std::string &Prefix : Prefixes) {
1749    if (!D.getVFS().exists(Prefix))
1750      continue;
1751    for (StringRef Suffix : CandidateLibDirs) {
1752      const std::string LibDir = Prefix + Suffix.str();
1753      if (!D.getVFS().exists(LibDir))
1754        continue;
1755      for (StringRef Candidate : ExtraTripleAliases) // Try these first.
1756        ScanLibDirForGCCTriple(TargetTriple, Args, LibDir, Candidate);
1757      for (StringRef Candidate : CandidateTripleAliases)
1758        ScanLibDirForGCCTriple(TargetTriple, Args, LibDir, Candidate);
1759    }
1760    for (StringRef Suffix : CandidateBiarchLibDirs) {
1761      const std::string LibDir = Prefix + Suffix.str();
1762      if (!D.getVFS().exists(LibDir))
1763        continue;
1764      for (StringRef Candidate : CandidateBiarchTripleAliases)
1765        ScanLibDirForGCCTriple(TargetTriple, Args, LibDir, Candidate,
1766                               /*NeedsBiarchSuffix=*/ true);
1767    }
1768  }
1769}
1770
1771void Generic_GCC::GCCInstallationDetector::print(raw_ostream &OS) const {
1772  for (const auto &InstallPath : CandidateGCCInstallPaths)
1773    OS << "Found candidate GCC installation: " << InstallPath << "\n";
1774
1775  if (!GCCInstallPath.empty())
1776    OS << "Selected GCC installation: " << GCCInstallPath << "\n";
1777
1778  for (const auto &Multilib : Multilibs)
1779    OS << "Candidate multilib: " << Multilib << "\n";
1780
1781  if (Multilibs.size() != 0 || !SelectedMultilib.isDefault())
1782    OS << "Selected multilib: " << SelectedMultilib << "\n";
1783}
1784
1785bool Generic_GCC::GCCInstallationDetector::getBiarchSibling(Multilib &M) const {
1786  if (BiarchSibling.hasValue()) {
1787    M = BiarchSibling.getValue();
1788    return true;
1789  }
1790  return false;
1791}
1792
1793/*static*/ void Generic_GCC::GCCInstallationDetector::CollectLibDirsAndTriples(
1794    const llvm::Triple &TargetTriple, const llvm::Triple &BiarchTriple,
1795    SmallVectorImpl<StringRef> &LibDirs,
1796    SmallVectorImpl<StringRef> &TripleAliases,
1797    SmallVectorImpl<StringRef> &BiarchLibDirs,
1798    SmallVectorImpl<StringRef> &BiarchTripleAliases) {
1799  // Declare a bunch of static data sets that we'll select between below. These
1800  // are specifically designed to always refer to string literals to avoid any
1801  // lifetime or initialization issues.
1802  static const char *const AArch64LibDirs[] = {"/lib64", "/lib"};
1803  static const char *const AArch64Triples[] = {
1804      "aarch64-none-linux-gnu", "aarch64-linux-gnu", "aarch64-linux-android",
1805      "aarch64-redhat-linux", "aarch64-suse-linux"};
1806  static const char *const AArch64beLibDirs[] = {"/lib"};
1807  static const char *const AArch64beTriples[] = {"aarch64_be-none-linux-gnu",
1808                                                 "aarch64_be-linux-gnu"};
1809
1810  static const char *const ARMLibDirs[] = {"/lib"};
1811  static const char *const ARMTriples[] = {"arm-linux-gnueabi",
1812                                           "arm-linux-androideabi"};
1813  static const char *const ARMHFTriples[] = {"arm-linux-gnueabihf",
1814                                             "armv7hl-redhat-linux-gnueabi",
1815                                             "armv6hl-suse-linux-gnueabi",
1816                                             "armv7hl-suse-linux-gnueabi"};
1817  static const char *const ARMebLibDirs[] = {"/lib"};
1818  static const char *const ARMebTriples[] = {"armeb-linux-gnueabi",
1819                                             "armeb-linux-androideabi"};
1820  static const char *const ARMebHFTriples[] = {
1821      "armeb-linux-gnueabihf", "armebv7hl-redhat-linux-gnueabi"};
1822
1823  static const char *const X86_64LibDirs[] = {"/lib64", "/lib"};
1824  static const char *const X86_64Triples[] = {
1825      "x86_64-linux-gnu",       "x86_64-unknown-linux-gnu",
1826      "x86_64-pc-linux-gnu",    "x86_64-redhat-linux6E",
1827      "x86_64-redhat-linux",    "x86_64-suse-linux",
1828      "x86_64-manbo-linux-gnu", "x86_64-linux-gnu",
1829      "x86_64-slackware-linux", "x86_64-linux-android",
1830      "x86_64-unknown-linux"};
1831  static const char *const X32LibDirs[] = {"/libx32"};
1832  static const char *const X86LibDirs[] = {"/lib32", "/lib"};
1833  static const char *const X86Triples[] = {
1834      "i686-linux-gnu",       "i686-pc-linux-gnu",     "i486-linux-gnu",
1835      "i386-linux-gnu",       "i386-redhat-linux6E",   "i686-redhat-linux",
1836      "i586-redhat-linux",    "i386-redhat-linux",     "i586-suse-linux",
1837      "i486-slackware-linux", "i686-montavista-linux", "i686-linux-android",
1838      "i586-linux-gnu"};
1839
1840  static const char *const MIPSLibDirs[] = {"/lib"};
1841  static const char *const MIPSTriples[] = {"mips-linux-gnu", "mips-mti-linux",
1842                                            "mips-mti-linux-gnu",
1843                                            "mips-img-linux-gnu"};
1844  static const char *const MIPSELLibDirs[] = {"/lib"};
1845  static const char *const MIPSELTriples[] = {"mipsel-linux-gnu",
1846                                              "mips-img-linux-gnu"};
1847
1848  static const char *const MIPS64LibDirs[] = {"/lib64", "/lib"};
1849  static const char *const MIPS64Triples[] = {
1850      "mips64-linux-gnu", "mips-mti-linux-gnu", "mips-img-linux-gnu",
1851      "mips64-linux-gnuabi64"};
1852  static const char *const MIPS64ELLibDirs[] = {"/lib64", "/lib"};
1853  static const char *const MIPS64ELTriples[] = {
1854      "mips64el-linux-gnu", "mips-mti-linux-gnu", "mips-img-linux-gnu",
1855      "mips64el-linux-gnuabi64"};
1856
1857  static const char *const MIPSELAndroidLibDirs[] = {"/lib", "/libr2",
1858                                                     "/libr6"};
1859  static const char *const MIPSELAndroidTriples[] = {"mipsel-linux-android"};
1860  static const char *const MIPS64ELAndroidLibDirs[] = {"/lib64", "/lib",
1861                                                       "/libr2", "/libr6"};
1862  static const char *const MIPS64ELAndroidTriples[] = {
1863      "mips64el-linux-android"};
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 SPARCv8LibDirs[] = {"/lib32", "/lib"};
1879  static const char *const SPARCv8Triples[] = {"sparc-linux-gnu",
1880                                               "sparcv8-linux-gnu"};
1881  static const char *const SPARCv9LibDirs[] = {"/lib64", "/lib"};
1882  static const char *const SPARCv9Triples[] = {"sparc64-linux-gnu",
1883                                               "sparcv9-linux-gnu"};
1884
1885  static const char *const SystemZLibDirs[] = {"/lib64", "/lib"};
1886  static const char *const SystemZTriples[] = {
1887      "s390x-linux-gnu", "s390x-unknown-linux-gnu", "s390x-ibm-linux-gnu",
1888      "s390x-suse-linux", "s390x-redhat-linux"};
1889
1890  // Solaris.
1891  static const char *const SolarisSPARCLibDirs[] = {"/gcc"};
1892  static const char *const SolarisSPARCTriples[] = {"sparc-sun-solaris2.11",
1893                                                    "i386-pc-solaris2.11"};
1894
1895  using std::begin;
1896  using std::end;
1897
1898  if (TargetTriple.getOS() == llvm::Triple::Solaris) {
1899    LibDirs.append(begin(SolarisSPARCLibDirs), end(SolarisSPARCLibDirs));
1900    TripleAliases.append(begin(SolarisSPARCTriples), end(SolarisSPARCTriples));
1901    return;
1902  }
1903
1904  switch (TargetTriple.getArch()) {
1905  case llvm::Triple::aarch64:
1906    LibDirs.append(begin(AArch64LibDirs), end(AArch64LibDirs));
1907    TripleAliases.append(begin(AArch64Triples), end(AArch64Triples));
1908    BiarchLibDirs.append(begin(AArch64LibDirs), end(AArch64LibDirs));
1909    BiarchTripleAliases.append(begin(AArch64Triples), end(AArch64Triples));
1910    break;
1911  case llvm::Triple::aarch64_be:
1912    LibDirs.append(begin(AArch64beLibDirs), end(AArch64beLibDirs));
1913    TripleAliases.append(begin(AArch64beTriples), end(AArch64beTriples));
1914    BiarchLibDirs.append(begin(AArch64beLibDirs), end(AArch64beLibDirs));
1915    BiarchTripleAliases.append(begin(AArch64beTriples), end(AArch64beTriples));
1916    break;
1917  case llvm::Triple::arm:
1918  case llvm::Triple::thumb:
1919    LibDirs.append(begin(ARMLibDirs), end(ARMLibDirs));
1920    if (TargetTriple.getEnvironment() == llvm::Triple::GNUEABIHF) {
1921      TripleAliases.append(begin(ARMHFTriples), end(ARMHFTriples));
1922    } else {
1923      TripleAliases.append(begin(ARMTriples), end(ARMTriples));
1924    }
1925    break;
1926  case llvm::Triple::armeb:
1927  case llvm::Triple::thumbeb:
1928    LibDirs.append(begin(ARMebLibDirs), end(ARMebLibDirs));
1929    if (TargetTriple.getEnvironment() == llvm::Triple::GNUEABIHF) {
1930      TripleAliases.append(begin(ARMebHFTriples), end(ARMebHFTriples));
1931    } else {
1932      TripleAliases.append(begin(ARMebTriples), end(ARMebTriples));
1933    }
1934    break;
1935  case llvm::Triple::x86_64:
1936    LibDirs.append(begin(X86_64LibDirs), end(X86_64LibDirs));
1937    TripleAliases.append(begin(X86_64Triples), end(X86_64Triples));
1938    // x32 is always available when x86_64 is available, so adding it as
1939    // secondary arch with x86_64 triples
1940    if (TargetTriple.getEnvironment() == llvm::Triple::GNUX32) {
1941      BiarchLibDirs.append(begin(X32LibDirs), end(X32LibDirs));
1942      BiarchTripleAliases.append(begin(X86_64Triples), end(X86_64Triples));
1943    } else {
1944      BiarchLibDirs.append(begin(X86LibDirs), end(X86LibDirs));
1945      BiarchTripleAliases.append(begin(X86Triples), end(X86Triples));
1946    }
1947    break;
1948  case llvm::Triple::x86:
1949    LibDirs.append(begin(X86LibDirs), end(X86LibDirs));
1950    // MCU toolchain is 32 bit only and its triple alias is TargetTriple
1951    // itself, which will be appended below.
1952    if (!TargetTriple.isOSIAMCU()) {
1953      TripleAliases.append(begin(X86Triples), end(X86Triples));
1954      BiarchLibDirs.append(begin(X86_64LibDirs), end(X86_64LibDirs));
1955      BiarchTripleAliases.append(begin(X86_64Triples), end(X86_64Triples));
1956    }
1957    break;
1958  case llvm::Triple::mips:
1959    LibDirs.append(begin(MIPSLibDirs), end(MIPSLibDirs));
1960    TripleAliases.append(begin(MIPSTriples), end(MIPSTriples));
1961    BiarchLibDirs.append(begin(MIPS64LibDirs), end(MIPS64LibDirs));
1962    BiarchTripleAliases.append(begin(MIPS64Triples), end(MIPS64Triples));
1963    break;
1964  case llvm::Triple::mipsel:
1965    if (TargetTriple.isAndroid()) {
1966      LibDirs.append(begin(MIPSELAndroidLibDirs), end(MIPSELAndroidLibDirs));
1967      TripleAliases.append(begin(MIPSELAndroidTriples),
1968                           end(MIPSELAndroidTriples));
1969      BiarchLibDirs.append(begin(MIPS64ELAndroidLibDirs),
1970                           end(MIPS64ELAndroidLibDirs));
1971      BiarchTripleAliases.append(begin(MIPS64ELAndroidTriples),
1972                                 end(MIPS64ELAndroidTriples));
1973
1974    } else {
1975      LibDirs.append(begin(MIPSELLibDirs), end(MIPSELLibDirs));
1976      TripleAliases.append(begin(MIPSELTriples), end(MIPSELTriples));
1977      TripleAliases.append(begin(MIPSTriples), end(MIPSTriples));
1978      BiarchLibDirs.append(begin(MIPS64ELLibDirs), end(MIPS64ELLibDirs));
1979      BiarchTripleAliases.append(begin(MIPS64ELTriples), end(MIPS64ELTriples));
1980    }
1981    break;
1982  case llvm::Triple::mips64:
1983    LibDirs.append(begin(MIPS64LibDirs), end(MIPS64LibDirs));
1984    TripleAliases.append(begin(MIPS64Triples), end(MIPS64Triples));
1985    BiarchLibDirs.append(begin(MIPSLibDirs), end(MIPSLibDirs));
1986    BiarchTripleAliases.append(begin(MIPSTriples), end(MIPSTriples));
1987    break;
1988  case llvm::Triple::mips64el:
1989    if (TargetTriple.isAndroid()) {
1990      LibDirs.append(begin(MIPS64ELAndroidLibDirs),
1991                     end(MIPS64ELAndroidLibDirs));
1992      TripleAliases.append(begin(MIPS64ELAndroidTriples),
1993                           end(MIPS64ELAndroidTriples));
1994      BiarchLibDirs.append(begin(MIPSELAndroidLibDirs),
1995                           end(MIPSELAndroidLibDirs));
1996      BiarchTripleAliases.append(begin(MIPSELAndroidTriples),
1997                                 end(MIPSELAndroidTriples));
1998
1999    } else {
2000      LibDirs.append(begin(MIPS64ELLibDirs), end(MIPS64ELLibDirs));
2001      TripleAliases.append(begin(MIPS64ELTriples), end(MIPS64ELTriples));
2002      BiarchLibDirs.append(begin(MIPSELLibDirs), end(MIPSELLibDirs));
2003      BiarchTripleAliases.append(begin(MIPSELTriples), end(MIPSELTriples));
2004      BiarchTripleAliases.append(begin(MIPSTriples), end(MIPSTriples));
2005    }
2006    break;
2007  case llvm::Triple::ppc:
2008    LibDirs.append(begin(PPCLibDirs), end(PPCLibDirs));
2009    TripleAliases.append(begin(PPCTriples), end(PPCTriples));
2010    BiarchLibDirs.append(begin(PPC64LibDirs), end(PPC64LibDirs));
2011    BiarchTripleAliases.append(begin(PPC64Triples), end(PPC64Triples));
2012    break;
2013  case llvm::Triple::ppc64:
2014    LibDirs.append(begin(PPC64LibDirs), end(PPC64LibDirs));
2015    TripleAliases.append(begin(PPC64Triples), end(PPC64Triples));
2016    BiarchLibDirs.append(begin(PPCLibDirs), end(PPCLibDirs));
2017    BiarchTripleAliases.append(begin(PPCTriples), end(PPCTriples));
2018    break;
2019  case llvm::Triple::ppc64le:
2020    LibDirs.append(begin(PPC64LELibDirs), end(PPC64LELibDirs));
2021    TripleAliases.append(begin(PPC64LETriples), end(PPC64LETriples));
2022    break;
2023  case llvm::Triple::sparc:
2024  case llvm::Triple::sparcel:
2025    LibDirs.append(begin(SPARCv8LibDirs), end(SPARCv8LibDirs));
2026    TripleAliases.append(begin(SPARCv8Triples), end(SPARCv8Triples));
2027    BiarchLibDirs.append(begin(SPARCv9LibDirs), end(SPARCv9LibDirs));
2028    BiarchTripleAliases.append(begin(SPARCv9Triples), end(SPARCv9Triples));
2029    break;
2030  case llvm::Triple::sparcv9:
2031    LibDirs.append(begin(SPARCv9LibDirs), end(SPARCv9LibDirs));
2032    TripleAliases.append(begin(SPARCv9Triples), end(SPARCv9Triples));
2033    BiarchLibDirs.append(begin(SPARCv8LibDirs), end(SPARCv8LibDirs));
2034    BiarchTripleAliases.append(begin(SPARCv8Triples), end(SPARCv8Triples));
2035    break;
2036  case llvm::Triple::systemz:
2037    LibDirs.append(begin(SystemZLibDirs), end(SystemZLibDirs));
2038    TripleAliases.append(begin(SystemZTriples), end(SystemZTriples));
2039    break;
2040  default:
2041    // By default, just rely on the standard lib directories and the original
2042    // triple.
2043    break;
2044  }
2045
2046  // Always append the drivers target triple to the end, in case it doesn't
2047  // match any of our aliases.
2048  TripleAliases.push_back(TargetTriple.str());
2049
2050  // Also include the multiarch variant if it's different.
2051  if (TargetTriple.str() != BiarchTriple.str())
2052    BiarchTripleAliases.push_back(BiarchTriple.str());
2053}
2054
2055void Generic_GCC::GCCInstallationDetector::scanLibDirForGCCTripleSolaris(
2056    const llvm::Triple &TargetArch, const llvm::opt::ArgList &Args,
2057    const std::string &LibDir, StringRef CandidateTriple,
2058    bool NeedsBiarchSuffix) {
2059  // Solaris is a special case. The GCC installation is under
2060  // /usr/gcc/<major>.<minor>/lib/gcc/<triple>/<major>.<minor>.<patch>/, so we
2061  // need to iterate twice.
2062  std::error_code EC;
2063  for (vfs::directory_iterator LI = D.getVFS().dir_begin(LibDir, EC), LE;
2064       !EC && LI != LE; LI = LI.increment(EC)) {
2065    StringRef VersionText = llvm::sys::path::filename(LI->getName());
2066    GCCVersion CandidateVersion = GCCVersion::Parse(VersionText);
2067
2068    if (CandidateVersion.Major != -1) // Filter obviously bad entries.
2069      if (!CandidateGCCInstallPaths.insert(LI->getName()).second)
2070        continue; // Saw this path before; no need to look at it again.
2071    if (CandidateVersion.isOlderThan(4, 1, 1))
2072      continue;
2073    if (CandidateVersion <= Version)
2074      continue;
2075
2076    GCCInstallPath =
2077        LibDir + "/" + VersionText.str() + "/lib/gcc/" + CandidateTriple.str();
2078    if (!D.getVFS().exists(GCCInstallPath))
2079      continue;
2080
2081    // If we make it here there has to be at least one GCC version, let's just
2082    // use the latest one.
2083    std::error_code EEC;
2084    for (vfs::directory_iterator
2085             LLI = D.getVFS().dir_begin(GCCInstallPath, EEC),
2086             LLE;
2087         !EEC && LLI != LLE; LLI = LLI.increment(EEC)) {
2088
2089      StringRef SubVersionText = llvm::sys::path::filename(LLI->getName());
2090      GCCVersion CandidateSubVersion = GCCVersion::Parse(SubVersionText);
2091
2092      if (CandidateSubVersion > Version)
2093        Version = CandidateSubVersion;
2094    }
2095
2096    GCCTriple.setTriple(CandidateTriple);
2097
2098    GCCInstallPath += "/" + Version.Text;
2099    GCCParentLibPath = GCCInstallPath + "/../../../../";
2100
2101    IsValid = true;
2102  }
2103}
2104
2105bool Generic_GCC::GCCInstallationDetector::ScanGCCForMultilibs(
2106    const llvm::Triple &TargetTriple, const ArgList &Args,
2107    StringRef Path, bool NeedsBiarchSuffix) {
2108  llvm::Triple::ArchType TargetArch = TargetTriple.getArch();
2109  DetectedMultilibs Detected;
2110
2111  // Android standalone toolchain could have multilibs for ARM and Thumb.
2112  // Debian mips multilibs behave more like the rest of the biarch ones,
2113  // so handle them there
2114  if (isArmOrThumbArch(TargetArch) && TargetTriple.isAndroid()) {
2115    // It should also work without multilibs in a simplified toolchain.
2116    findAndroidArmMultilibs(D, TargetTriple, Path, Args, Detected);
2117  } else if (tools::isMipsArch(TargetArch)) {
2118    if (!findMIPSMultilibs(D, TargetTriple, Path, Args, Detected))
2119      return false;
2120  } else if (!findBiarchMultilibs(D, TargetTriple, Path, Args,
2121                                  NeedsBiarchSuffix, Detected)) {
2122    return false;
2123  }
2124
2125  Multilibs = Detected.Multilibs;
2126  SelectedMultilib = Detected.SelectedMultilib;
2127  BiarchSibling = Detected.BiarchSibling;
2128
2129  return true;
2130}
2131
2132void Generic_GCC::GCCInstallationDetector::ScanLibDirForGCCTriple(
2133    const llvm::Triple &TargetTriple, const ArgList &Args,
2134    const std::string &LibDir, StringRef CandidateTriple,
2135    bool NeedsBiarchSuffix) {
2136  if (TargetTriple.getOS() == llvm::Triple::Solaris) {
2137    scanLibDirForGCCTripleSolaris(TargetTriple, Args, LibDir, CandidateTriple,
2138                                  NeedsBiarchSuffix);
2139    return;
2140  }
2141
2142  llvm::Triple::ArchType TargetArch = TargetTriple.getArch();
2143  // Locations relative to the system lib directory where GCC's triple-specific
2144  // directories might reside.
2145  struct GCCLibSuffix {
2146    // Path from system lib directory to GCC triple-specific directory.
2147    std::string LibSuffix;
2148    // Path from GCC triple-specific directory back to system lib directory.
2149    // This is one '..' component per component in LibSuffix.
2150    StringRef ReversePath;
2151    // Whether this library suffix is relevant for the triple.
2152    bool Active;
2153  } Suffixes[] = {
2154    // This is the normal place.
2155    {"gcc/" + CandidateTriple.str(), "../..", true},
2156
2157    // Debian puts cross-compilers in gcc-cross.
2158    {"gcc-cross/" + CandidateTriple.str(), "../..", true},
2159
2160    // The Freescale PPC SDK has the gcc libraries in
2161    // <sysroot>/usr/lib/<triple>/x.y.z so have a look there as well. Only do
2162    // this on Freescale triples, though, since some systems put a *lot* of
2163    // files in that location, not just GCC installation data.
2164    {CandidateTriple.str(), "..",
2165      TargetTriple.getVendor() == llvm::Triple::Freescale},
2166
2167    // Natively multiarch systems sometimes put the GCC triple-specific
2168    // directory within their multiarch lib directory, resulting in the
2169    // triple appearing twice.
2170    {CandidateTriple.str() + "/gcc/" + CandidateTriple.str(), "../../..", true},
2171
2172    // Deal with cases (on Ubuntu) where the system architecture could be i386
2173    // but the GCC target architecture could be (say) i686.
2174    // FIXME: It may be worthwhile to generalize this and look for a second
2175    // triple.
2176    {"i386-linux-gnu/gcc/" + CandidateTriple.str(), "../../..",
2177      TargetArch == llvm::Triple::x86}
2178  };
2179
2180  for (auto &Suffix : Suffixes) {
2181    if (!Suffix.Active)
2182      continue;
2183
2184    StringRef LibSuffix = Suffix.LibSuffix;
2185    std::error_code EC;
2186    for (vfs::directory_iterator
2187             LI = D.getVFS().dir_begin(LibDir + "/" + LibSuffix, EC),
2188             LE;
2189         !EC && LI != LE; LI = LI.increment(EC)) {
2190      StringRef VersionText = llvm::sys::path::filename(LI->getName());
2191      GCCVersion CandidateVersion = GCCVersion::Parse(VersionText);
2192      if (CandidateVersion.Major != -1) // Filter obviously bad entries.
2193        if (!CandidateGCCInstallPaths.insert(LI->getName()).second)
2194          continue; // Saw this path before; no need to look at it again.
2195      if (CandidateVersion.isOlderThan(4, 1, 1))
2196        continue;
2197      if (CandidateVersion <= Version)
2198        continue;
2199
2200      if (!ScanGCCForMultilibs(TargetTriple, Args, LI->getName(),
2201                               NeedsBiarchSuffix))
2202        continue;
2203
2204      Version = CandidateVersion;
2205      GCCTriple.setTriple(CandidateTriple);
2206      // FIXME: We hack together the directory name here instead of
2207      // using LI to ensure stable path separators across Windows and
2208      // Linux.
2209      GCCInstallPath = (LibDir + "/" + LibSuffix + "/" + VersionText).str();
2210      GCCParentLibPath = (GCCInstallPath + "/../" + Suffix.ReversePath).str();
2211      IsValid = true;
2212    }
2213  }
2214}
2215
2216bool Generic_GCC::GCCInstallationDetector::ScanGentooGccConfig(
2217    const llvm::Triple &TargetTriple, const ArgList &Args,
2218    StringRef CandidateTriple, bool NeedsBiarchSuffix) {
2219  llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> File =
2220      D.getVFS().getBufferForFile(D.SysRoot + "/etc/env.d/gcc/config-" +
2221                                  CandidateTriple.str());
2222  if (File) {
2223    SmallVector<StringRef, 2> Lines;
2224    File.get()->getBuffer().split(Lines, "\n");
2225    for (StringRef Line : Lines) {
2226      Line = Line.trim();
2227      // CURRENT=triple-version
2228      if (Line.consume_front("CURRENT=")) {
2229        const std::pair<StringRef, StringRef> ActiveVersion =
2230          Line.rsplit('-');
2231        // Note: Strictly speaking, we should be reading
2232        // /etc/env.d/gcc/${CURRENT} now. However, the file doesn't
2233        // contain anything new or especially useful to us.
2234        const std::string GentooPath = D.SysRoot + "/usr/lib/gcc/" +
2235                                       ActiveVersion.first.str() + "/" +
2236                                       ActiveVersion.second.str();
2237        if (D.getVFS().exists(GentooPath + "/crtbegin.o")) {
2238          if (!ScanGCCForMultilibs(TargetTriple, Args, GentooPath,
2239                                   NeedsBiarchSuffix))
2240            return false;
2241
2242          Version = GCCVersion::Parse(ActiveVersion.second);
2243          GCCInstallPath = GentooPath;
2244          GCCParentLibPath = GentooPath + "/../../..";
2245          GCCTriple.setTriple(ActiveVersion.first);
2246          IsValid = true;
2247          return true;
2248        }
2249      }
2250    }
2251  }
2252
2253  return false;
2254}
2255
2256Generic_GCC::Generic_GCC(const Driver &D, const llvm::Triple &Triple,
2257                         const ArgList &Args)
2258    : ToolChain(D, Triple, Args), GCCInstallation(D),
2259      CudaInstallation(D, Triple, Args) {
2260  getProgramPaths().push_back(getDriver().getInstalledDir());
2261  if (getDriver().getInstalledDir() != getDriver().Dir)
2262    getProgramPaths().push_back(getDriver().Dir);
2263}
2264
2265Generic_GCC::~Generic_GCC() {}
2266
2267Tool *Generic_GCC::getTool(Action::ActionClass AC) const {
2268  switch (AC) {
2269  case Action::PreprocessJobClass:
2270    if (!Preprocess)
2271      Preprocess.reset(new clang::driver::tools::gcc::Preprocessor(*this));
2272    return Preprocess.get();
2273  case Action::CompileJobClass:
2274    if (!Compile)
2275      Compile.reset(new tools::gcc::Compiler(*this));
2276    return Compile.get();
2277  default:
2278    return ToolChain::getTool(AC);
2279  }
2280}
2281
2282Tool *Generic_GCC::buildAssembler() const {
2283  return new tools::gnutools::Assembler(*this);
2284}
2285
2286Tool *Generic_GCC::buildLinker() const { return new tools::gcc::Linker(*this); }
2287
2288void Generic_GCC::printVerboseInfo(raw_ostream &OS) const {
2289  // Print the information about how we detected the GCC installation.
2290  GCCInstallation.print(OS);
2291  CudaInstallation.print(OS);
2292}
2293
2294bool Generic_GCC::IsUnwindTablesDefault() const {
2295  return getArch() == llvm::Triple::x86_64;
2296}
2297
2298bool Generic_GCC::isPICDefault() const {
2299  switch (getArch()) {
2300  case llvm::Triple::x86_64:
2301    return getTriple().isOSWindows();
2302  case llvm::Triple::ppc64:
2303  case llvm::Triple::ppc64le:
2304    return !getTriple().isOSBinFormatMachO() && !getTriple().isMacOSX();
2305  case llvm::Triple::mips64:
2306  case llvm::Triple::mips64el:
2307    return true;
2308  default:
2309    return false;
2310  }
2311}
2312
2313bool Generic_GCC::isPIEDefault() const { return false; }
2314
2315bool Generic_GCC::isPICDefaultForced() const {
2316  return getArch() == llvm::Triple::x86_64 && getTriple().isOSWindows();
2317}
2318
2319bool Generic_GCC::IsIntegratedAssemblerDefault() const {
2320  switch (getTriple().getArch()) {
2321  case llvm::Triple::x86:
2322  case llvm::Triple::x86_64:
2323  case llvm::Triple::aarch64:
2324  case llvm::Triple::aarch64_be:
2325  case llvm::Triple::arm:
2326  case llvm::Triple::armeb:
2327  case llvm::Triple::avr:
2328  case llvm::Triple::bpfel:
2329  case llvm::Triple::bpfeb:
2330  case llvm::Triple::thumb:
2331  case llvm::Triple::thumbeb:
2332  case llvm::Triple::ppc:
2333  case llvm::Triple::ppc64:
2334  case llvm::Triple::ppc64le:
2335  case llvm::Triple::systemz:
2336  case llvm::Triple::mips:
2337  case llvm::Triple::mipsel:
2338    return true;
2339  case llvm::Triple::mips64:
2340  case llvm::Triple::mips64el:
2341    // Enabled for Debian and Android mips64/mipsel, as they can precisely
2342    // identify the ABI in use (Debian) or only use N64 for MIPS64 (Android).
2343    // Other targets are unable to distinguish N32 from N64.
2344    if (getTriple().getEnvironment() == llvm::Triple::GNUABI64 ||
2345        getTriple().isAndroid())
2346      return true;
2347    return false;
2348  default:
2349    return false;
2350  }
2351}
2352
2353void Generic_GCC::AddClangCXXStdlibIncludeArgs(const ArgList &DriverArgs,
2354                                               ArgStringList &CC1Args) const {
2355  if (DriverArgs.hasArg(options::OPT_nostdlibinc) ||
2356      DriverArgs.hasArg(options::OPT_nostdincxx))
2357    return;
2358
2359  switch (GetCXXStdlibType(DriverArgs)) {
2360  case ToolChain::CST_Libcxx: {
2361    std::string Path = findLibCxxIncludePath();
2362    if (!Path.empty())
2363      addSystemInclude(DriverArgs, CC1Args, Path);
2364    break;
2365  }
2366
2367  case ToolChain::CST_Libstdcxx:
2368    addLibStdCxxIncludePaths(DriverArgs, CC1Args);
2369    break;
2370  }
2371}
2372
2373std::string Generic_GCC::findLibCxxIncludePath() const {
2374  // FIXME: The Linux behavior would probaby be a better approach here.
2375  return getDriver().SysRoot + "/usr/include/c++/v1";
2376}
2377
2378void
2379Generic_GCC::addLibStdCxxIncludePaths(const llvm::opt::ArgList &DriverArgs,
2380                                      llvm::opt::ArgStringList &CC1Args) const {
2381  // By default, we don't assume we know where libstdc++ might be installed.
2382  // FIXME: If we have a valid GCCInstallation, use it.
2383}
2384
2385/// \brief Helper to add the variant paths of a libstdc++ installation.
2386bool Generic_GCC::addLibStdCXXIncludePaths(
2387    Twine Base, Twine Suffix, StringRef GCCTriple, StringRef GCCMultiarchTriple,
2388    StringRef TargetMultiarchTriple, Twine IncludeSuffix,
2389    const ArgList &DriverArgs, ArgStringList &CC1Args) const {
2390  if (!getVFS().exists(Base + Suffix))
2391    return false;
2392
2393  addSystemInclude(DriverArgs, CC1Args, Base + Suffix);
2394
2395  // The vanilla GCC layout of libstdc++ headers uses a triple subdirectory. If
2396  // that path exists or we have neither a GCC nor target multiarch triple, use
2397  // this vanilla search path.
2398  if ((GCCMultiarchTriple.empty() && TargetMultiarchTriple.empty()) ||
2399      getVFS().exists(Base + Suffix + "/" + GCCTriple + IncludeSuffix)) {
2400    addSystemInclude(DriverArgs, CC1Args,
2401                     Base + Suffix + "/" + GCCTriple + IncludeSuffix);
2402  } else {
2403    // Otherwise try to use multiarch naming schemes which have normalized the
2404    // triples and put the triple before the suffix.
2405    //
2406    // GCC surprisingly uses *both* the GCC triple with a multilib suffix and
2407    // the target triple, so we support that here.
2408    addSystemInclude(DriverArgs, CC1Args,
2409                     Base + "/" + GCCMultiarchTriple + Suffix + IncludeSuffix);
2410    addSystemInclude(DriverArgs, CC1Args,
2411                     Base + "/" + TargetMultiarchTriple + Suffix);
2412  }
2413
2414  addSystemInclude(DriverArgs, CC1Args, Base + Suffix + "/backward");
2415  return true;
2416}
2417
2418llvm::opt::DerivedArgList *
2419Generic_GCC::TranslateArgs(const llvm::opt::DerivedArgList &Args, StringRef,
2420                           Action::OffloadKind DeviceOffloadKind) const {
2421
2422  // If this tool chain is used for an OpenMP offloading device we have to make
2423  // sure we always generate a shared library regardless of the commands the
2424  // user passed to the host. This is required because the runtime library
2425  // is required to load the device image dynamically at run time.
2426  if (DeviceOffloadKind == Action::OFK_OpenMP) {
2427    DerivedArgList *DAL = new DerivedArgList(Args.getBaseArgs());
2428    const OptTable &Opts = getDriver().getOpts();
2429
2430    // Request the shared library. Given that these options are decided
2431    // implicitly, they do not refer to any base argument.
2432    DAL->AddFlagArg(/*BaseArg=*/nullptr, Opts.getOption(options::OPT_shared));
2433    DAL->AddFlagArg(/*BaseArg=*/nullptr, Opts.getOption(options::OPT_fPIC));
2434
2435    // Filter all the arguments we don't care passing to the offloading
2436    // toolchain as they can mess up with the creation of a shared library.
2437    for (auto *A : Args) {
2438      switch ((options::ID)A->getOption().getID()) {
2439      default:
2440        DAL->append(A);
2441        break;
2442      case options::OPT_shared:
2443      case options::OPT_dynamic:
2444      case options::OPT_static:
2445      case options::OPT_fPIC:
2446      case options::OPT_fno_PIC:
2447      case options::OPT_fpic:
2448      case options::OPT_fno_pic:
2449      case options::OPT_fPIE:
2450      case options::OPT_fno_PIE:
2451      case options::OPT_fpie:
2452      case options::OPT_fno_pie:
2453        break;
2454      }
2455    }
2456    return DAL;
2457  }
2458  return nullptr;
2459}
2460
2461void Generic_ELF::anchor() {}
2462
2463void Generic_ELF::addClangTargetOptions(const ArgList &DriverArgs,
2464                                        ArgStringList &CC1Args,
2465                                        Action::OffloadKind) const {
2466  const Generic_GCC::GCCVersion &V = GCCInstallation.getVersion();
2467  bool UseInitArrayDefault =
2468      getTriple().getArch() == llvm::Triple::aarch64 ||
2469      getTriple().getArch() == llvm::Triple::aarch64_be ||
2470      (getTriple().getOS() == llvm::Triple::Linux &&
2471       (!V.isOlderThan(4, 7, 0) || getTriple().isAndroid())) ||
2472      getTriple().getOS() == llvm::Triple::NaCl ||
2473      (getTriple().getVendor() == llvm::Triple::MipsTechnologies &&
2474       !getTriple().hasEnvironment()) ||
2475      getTriple().getOS() == llvm::Triple::Solaris;
2476
2477  if (DriverArgs.hasFlag(options::OPT_fuse_init_array,
2478                         options::OPT_fno_use_init_array, UseInitArrayDefault))
2479    CC1Args.push_back("-fuse-init-array");
2480}
2481