Gnu.cpp revision 363496 
1//===--- Gnu.cpp - Gnu Tool and ToolChain Implementations -------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#include "Gnu.h"
10#include "Arch/ARM.h"
11#include "Arch/Mips.h"
12#include "Arch/PPC.h"
13#include "Arch/RISCV.h"
14#include "Arch/Sparc.h"
15#include "Arch/SystemZ.h"
16#include "CommonArgs.h"
17#include "Linux.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 "clang/Driver/ToolChain.h"
25#include "llvm/Option/ArgList.h"
26#include "llvm/Support/CodeGen.h"
27#include "llvm/Support/Path.h"
28#include "llvm/Support/TargetParser.h"
29#include "llvm/Support/VirtualFileSystem.h"
30#include <system_error>
31
32using namespace clang::driver;
33using namespace clang::driver::toolchains;
34using namespace clang;
35using namespace llvm::opt;
36
37using tools::addMultilibFlag;
38
39void tools::GnuTool::anchor() {}
40
41static bool forwardToGCC(const Option &O) {
42  // Don't forward inputs from the original command line.  They are added from
43  // InputInfoList.
44  return O.getKind() != Option::InputClass &&
45         !O.hasFlag(options::DriverOption) && !O.hasFlag(options::LinkerInput);
46}
47
48// Switch CPU names not recognized by GNU assembler to a close CPU that it does
49// recognize, instead of a lower march from being picked in the absence of a cpu
50// flag.
51static void normalizeCPUNamesForAssembler(const ArgList &Args,
52                                          ArgStringList &CmdArgs) {
53  if (Arg *A = Args.getLastArg(options::OPT_mcpu_EQ)) {
54    StringRef CPUArg(A->getValue());
55    if (CPUArg.equals_lower("krait"))
56      CmdArgs.push_back("-mcpu=cortex-a15");
57    else if(CPUArg.equals_lower("kryo"))
58      CmdArgs.push_back("-mcpu=cortex-a57");
59    else
60      Args.AddLastArg(CmdArgs, options::OPT_mcpu_EQ);
61  }
62}
63
64void tools::gcc::Common::ConstructJob(Compilation &C, const JobAction &JA,
65                                      const InputInfo &Output,
66                                      const InputInfoList &Inputs,
67                                      const ArgList &Args,
68                                      const char *LinkingOutput) const {
69  const Driver &D = getToolChain().getDriver();
70  ArgStringList CmdArgs;
71
72  for (const auto &A : Args) {
73    if (forwardToGCC(A->getOption())) {
74      // It is unfortunate that we have to claim here, as this means
75      // we will basically never report anything interesting for
76      // platforms using a generic gcc, even if we are just using gcc
77      // to get to the assembler.
78      A->claim();
79
80      // Don't forward any -g arguments to assembly steps.
81      if (isa<AssembleJobAction>(JA) &&
82          A->getOption().matches(options::OPT_g_Group))
83        continue;
84
85      // Don't forward any -W arguments to assembly and link steps.
86      if ((isa<AssembleJobAction>(JA) || isa<LinkJobAction>(JA)) &&
87          A->getOption().matches(options::OPT_W_Group))
88        continue;
89
90      // Don't forward -mno-unaligned-access since GCC doesn't understand
91      // it and because it doesn't affect the assembly or link steps.
92      if ((isa<AssembleJobAction>(JA) || isa<LinkJobAction>(JA)) &&
93          (A->getOption().matches(options::OPT_munaligned_access) ||
94           A->getOption().matches(options::OPT_mno_unaligned_access)))
95        continue;
96
97      A->render(Args, CmdArgs);
98    }
99  }
100
101  RenderExtraToolArgs(JA, CmdArgs);
102
103  // If using a driver driver, force the arch.
104  if (getToolChain().getTriple().isOSDarwin()) {
105    CmdArgs.push_back("-arch");
106    CmdArgs.push_back(
107        Args.MakeArgString(getToolChain().getDefaultUniversalArchName()));
108  }
109
110  // Try to force gcc to match the tool chain we want, if we recognize
111  // the arch.
112  //
113  // FIXME: The triple class should directly provide the information we want
114  // here.
115  switch (getToolChain().getArch()) {
116  default:
117    break;
118  case llvm::Triple::x86:
119  case llvm::Triple::ppc:
120    CmdArgs.push_back("-m32");
121    break;
122  case llvm::Triple::x86_64:
123  case llvm::Triple::ppc64:
124  case llvm::Triple::ppc64le:
125    CmdArgs.push_back("-m64");
126    break;
127  case llvm::Triple::sparcel:
128    CmdArgs.push_back("-EL");
129    break;
130  }
131
132  if (Output.isFilename()) {
133    CmdArgs.push_back("-o");
134    CmdArgs.push_back(Output.getFilename());
135  } else {
136    assert(Output.isNothing() && "Unexpected output");
137    CmdArgs.push_back("-fsyntax-only");
138  }
139
140  Args.AddAllArgValues(CmdArgs, options::OPT_Wa_COMMA, options::OPT_Xassembler);
141
142  // Only pass -x if gcc will understand it; otherwise hope gcc
143  // understands the suffix correctly. The main use case this would go
144  // wrong in is for linker inputs if they happened to have an odd
145  // suffix; really the only way to get this to happen is a command
146  // like '-x foobar a.c' which will treat a.c like a linker input.
147  //
148  // FIXME: For the linker case specifically, can we safely convert
149  // inputs into '-Wl,' options?
150  for (const auto &II : Inputs) {
151    // Don't try to pass LLVM or AST inputs to a generic gcc.
152    if (types::isLLVMIR(II.getType()))
153      D.Diag(clang::diag::err_drv_no_linker_llvm_support)
154          << getToolChain().getTripleString();
155    else if (II.getType() == types::TY_AST)
156      D.Diag(diag::err_drv_no_ast_support) << getToolChain().getTripleString();
157    else if (II.getType() == types::TY_ModuleFile)
158      D.Diag(diag::err_drv_no_module_support)
159          << getToolChain().getTripleString();
160
161    if (types::canTypeBeUserSpecified(II.getType())) {
162      CmdArgs.push_back("-x");
163      CmdArgs.push_back(types::getTypeName(II.getType()));
164    }
165
166    if (II.isFilename())
167      CmdArgs.push_back(II.getFilename());
168    else {
169      const Arg &A = II.getInputArg();
170
171      // Reverse translate some rewritten options.
172      if (A.getOption().matches(options::OPT_Z_reserved_lib_stdcxx)) {
173        CmdArgs.push_back("-lstdc++");
174        continue;
175      }
176
177      // Don't render as input, we need gcc to do the translations.
178      A.render(Args, CmdArgs);
179    }
180  }
181
182  const std::string &customGCCName = D.getCCCGenericGCCName();
183  const char *GCCName;
184  if (!customGCCName.empty())
185    GCCName = customGCCName.c_str();
186  else if (D.CCCIsCXX()) {
187    GCCName = "g++";
188  } else
189    GCCName = "gcc";
190
191  const char *Exec = Args.MakeArgString(getToolChain().GetProgramPath(GCCName));
192  C.addCommand(std::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));
193}
194
195void tools::gcc::Preprocessor::RenderExtraToolArgs(
196    const JobAction &JA, ArgStringList &CmdArgs) const {
197  CmdArgs.push_back("-E");
198}
199
200void tools::gcc::Compiler::RenderExtraToolArgs(const JobAction &JA,
201                                               ArgStringList &CmdArgs) const {
202  const Driver &D = getToolChain().getDriver();
203
204  switch (JA.getType()) {
205  // If -flto, etc. are present then make sure not to force assembly output.
206  case types::TY_LLVM_IR:
207  case types::TY_LTO_IR:
208  case types::TY_LLVM_BC:
209  case types::TY_LTO_BC:
210    CmdArgs.push_back("-c");
211    break;
212  // We assume we've got an "integrated" assembler in that gcc will produce an
213  // object file itself.
214  case types::TY_Object:
215    CmdArgs.push_back("-c");
216    break;
217  case types::TY_PP_Asm:
218    CmdArgs.push_back("-S");
219    break;
220  case types::TY_Nothing:
221    CmdArgs.push_back("-fsyntax-only");
222    break;
223  default:
224    D.Diag(diag::err_drv_invalid_gcc_output_type) << getTypeName(JA.getType());
225  }
226}
227
228void tools::gcc::Linker::RenderExtraToolArgs(const JobAction &JA,
229                                             ArgStringList &CmdArgs) const {
230  // The types are (hopefully) good enough.
231}
232
233// On Arm the endianness of the output file is determined by the target and
234// can be overridden by the pseudo-target flags '-mlittle-endian'/'-EL' and
235// '-mbig-endian'/'-EB'. Unlike other targets the flag does not result in a
236// normalized triple so we must handle the flag here.
237static bool isArmBigEndian(const llvm::Triple &Triple,
238                           const ArgList &Args) {
239  bool IsBigEndian = false;
240  switch (Triple.getArch()) {
241  case llvm::Triple::armeb:
242  case llvm::Triple::thumbeb:
243    IsBigEndian = true;
244    LLVM_FALLTHROUGH;
245  case llvm::Triple::arm:
246  case llvm::Triple::thumb:
247    if (Arg *A = Args.getLastArg(options::OPT_mlittle_endian,
248                               options::OPT_mbig_endian))
249      IsBigEndian = !A->getOption().matches(options::OPT_mlittle_endian);
250    break;
251  default:
252    break;
253  }
254  return IsBigEndian;
255}
256
257static const char *getLDMOption(const llvm::Triple &T, const ArgList &Args) {
258  switch (T.getArch()) {
259  case llvm::Triple::x86:
260    if (T.isOSIAMCU())
261      return "elf_iamcu";
262    return "elf_i386";
263  case llvm::Triple::aarch64:
264    return "aarch64linux";
265  case llvm::Triple::aarch64_be:
266    return "aarch64linuxb";
267  case llvm::Triple::arm:
268  case llvm::Triple::thumb:
269  case llvm::Triple::armeb:
270  case llvm::Triple::thumbeb:
271    return isArmBigEndian(T, Args) ? "armelfb_linux_eabi" : "armelf_linux_eabi";
272  case llvm::Triple::ppc:
273    return "elf32ppclinux";
274  case llvm::Triple::ppc64:
275    return "elf64ppc";
276  case llvm::Triple::ppc64le:
277    return "elf64lppc";
278  case llvm::Triple::riscv32:
279    return "elf32lriscv";
280  case llvm::Triple::riscv64:
281    return "elf64lriscv";
282  case llvm::Triple::sparc:
283  case llvm::Triple::sparcel:
284    return "elf32_sparc";
285  case llvm::Triple::sparcv9:
286    return "elf64_sparc";
287  case llvm::Triple::mips:
288    return "elf32btsmip";
289  case llvm::Triple::mipsel:
290    return "elf32ltsmip";
291  case llvm::Triple::mips64:
292    if (tools::mips::hasMipsAbiArg(Args, "n32") ||
293        T.getEnvironment() == llvm::Triple::GNUABIN32)
294      return "elf32btsmipn32";
295    return "elf64btsmip";
296  case llvm::Triple::mips64el:
297    if (tools::mips::hasMipsAbiArg(Args, "n32") ||
298        T.getEnvironment() == llvm::Triple::GNUABIN32)
299      return "elf32ltsmipn32";
300    return "elf64ltsmip";
301  case llvm::Triple::systemz:
302    return "elf64_s390";
303  case llvm::Triple::x86_64:
304    if (T.getEnvironment() == llvm::Triple::GNUX32)
305      return "elf32_x86_64";
306    return "elf_x86_64";
307  default:
308    return nullptr;
309  }
310}
311
312static bool getPIE(const ArgList &Args, const ToolChain &TC) {
313  if (Args.hasArg(options::OPT_shared) || Args.hasArg(options::OPT_static) ||
314      Args.hasArg(options::OPT_r) || Args.hasArg(options::OPT_static_pie))
315    return false;
316
317  Arg *A = Args.getLastArg(options::OPT_pie, options::OPT_no_pie,
318                           options::OPT_nopie);
319  if (!A)
320    return TC.isPIEDefault();
321  return A->getOption().matches(options::OPT_pie);
322}
323
324static bool getStaticPIE(const ArgList &Args, const ToolChain &TC) {
325  bool HasStaticPIE = Args.hasArg(options::OPT_static_pie);
326  // -no-pie is an alias for -nopie. So, handling -nopie takes care of
327  // -no-pie as well.
328  if (HasStaticPIE && Args.hasArg(options::OPT_nopie)) {
329    const Driver &D = TC.getDriver();
330    const llvm::opt::OptTable &Opts = D.getOpts();
331    const char *StaticPIEName = Opts.getOptionName(options::OPT_static_pie);
332    const char *NoPIEName = Opts.getOptionName(options::OPT_nopie);
333    D.Diag(diag::err_drv_cannot_mix_options) << StaticPIEName << NoPIEName;
334  }
335  return HasStaticPIE;
336}
337
338static bool getStatic(const ArgList &Args) {
339  return Args.hasArg(options::OPT_static) &&
340      !Args.hasArg(options::OPT_static_pie);
341}
342
343void tools::gnutools::Linker::ConstructJob(Compilation &C, const JobAction &JA,
344                                           const InputInfo &Output,
345                                           const InputInfoList &Inputs,
346                                           const ArgList &Args,
347                                           const char *LinkingOutput) const {
348  // FIXME: The Linker class constructor takes a ToolChain and not a
349  // Generic_ELF, so the static_cast might return a reference to a invalid
350  // instance (see PR45061). Ideally, the Linker constructor needs to take a
351  // Generic_ELF instead.
352  const toolchains::Generic_ELF &ToolChain =
353      static_cast<const toolchains::Generic_ELF &>(getToolChain());
354  const Driver &D = ToolChain.getDriver();
355
356  const llvm::Triple &Triple = getToolChain().getEffectiveTriple();
357
358  const llvm::Triple::ArchType Arch = ToolChain.getArch();
359  const bool isAndroid = ToolChain.getTriple().isAndroid();
360  const bool IsIAMCU = ToolChain.getTriple().isOSIAMCU();
361  const bool IsPIE = getPIE(Args, ToolChain);
362  const bool IsStaticPIE = getStaticPIE(Args, ToolChain);
363  const bool IsStatic = getStatic(Args);
364  const bool HasCRTBeginEndFiles =
365      ToolChain.getTriple().hasEnvironment() ||
366      (ToolChain.getTriple().getVendor() != llvm::Triple::MipsTechnologies);
367
368  ArgStringList CmdArgs;
369
370  // Silence warning for "clang -g foo.o -o foo"
371  Args.ClaimAllArgs(options::OPT_g_Group);
372  // and "clang -emit-llvm foo.o -o foo"
373  Args.ClaimAllArgs(options::OPT_emit_llvm);
374  // and for "clang -w foo.o -o foo". Other warning options are already
375  // handled somewhere else.
376  Args.ClaimAllArgs(options::OPT_w);
377
378  if (!D.SysRoot.empty())
379    CmdArgs.push_back(Args.MakeArgString("--sysroot=" + D.SysRoot));
380
381  if (IsPIE)
382    CmdArgs.push_back("-pie");
383
384  if (IsStaticPIE) {
385    CmdArgs.push_back("-static");
386    CmdArgs.push_back("-pie");
387    CmdArgs.push_back("--no-dynamic-linker");
388    CmdArgs.push_back("-z");
389    CmdArgs.push_back("text");
390  }
391
392  if (ToolChain.isNoExecStackDefault()) {
393    CmdArgs.push_back("-z");
394    CmdArgs.push_back("noexecstack");
395  }
396
397  if (Args.hasArg(options::OPT_rdynamic))
398    CmdArgs.push_back("-export-dynamic");
399
400  if (Args.hasArg(options::OPT_s))
401    CmdArgs.push_back("-s");
402
403  if (Triple.isARM() || Triple.isThumb() || Triple.isAArch64()) {
404    bool IsBigEndian = isArmBigEndian(Triple, Args);
405    if (IsBigEndian)
406      arm::appendBE8LinkFlag(Args, CmdArgs, Triple);
407    IsBigEndian = IsBigEndian || Arch == llvm::Triple::aarch64_be;
408    CmdArgs.push_back(IsBigEndian ? "-EB" : "-EL");
409  }
410
411  // Most Android ARM64 targets should enable the linker fix for erratum
412  // 843419. Only non-Cortex-A53 devices are allowed to skip this flag.
413  if (Arch == llvm::Triple::aarch64 && isAndroid) {
414    std::string CPU = getCPUName(Args, Triple);
415    if (CPU.empty() || CPU == "generic" || CPU == "cortex-a53")
416      CmdArgs.push_back("--fix-cortex-a53-843419");
417  }
418
419  // Android does not allow shared text relocations. Emit a warning if the
420  // user's code contains any.
421  if (isAndroid)
422      CmdArgs.push_back("--warn-shared-textrel");
423
424  ToolChain.addExtraOpts(CmdArgs);
425
426  CmdArgs.push_back("--eh-frame-hdr");
427
428  if (const char *LDMOption = getLDMOption(ToolChain.getTriple(), Args)) {
429    CmdArgs.push_back("-m");
430    CmdArgs.push_back(LDMOption);
431  } else {
432    D.Diag(diag::err_target_unknown_triple) << Triple.str();
433    return;
434  }
435
436  if (IsStatic) {
437    if (Arch == llvm::Triple::arm || Arch == llvm::Triple::armeb ||
438        Arch == llvm::Triple::thumb || Arch == llvm::Triple::thumbeb)
439      CmdArgs.push_back("-Bstatic");
440    else
441      CmdArgs.push_back("-static");
442  } else if (Args.hasArg(options::OPT_shared)) {
443    CmdArgs.push_back("-shared");
444  }
445
446  if (!IsStatic) {
447    if (Args.hasArg(options::OPT_rdynamic))
448      CmdArgs.push_back("-export-dynamic");
449
450    if (!Args.hasArg(options::OPT_shared) && !IsStaticPIE) {
451      const std::string Loader =
452          D.DyldPrefix + ToolChain.getDynamicLinker(Args);
453      CmdArgs.push_back("-dynamic-linker");
454      CmdArgs.push_back(Args.MakeArgString(Loader));
455    }
456  }
457
458  CmdArgs.push_back("-o");
459  CmdArgs.push_back(Output.getFilename());
460
461  if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles)) {
462    if (!isAndroid && !IsIAMCU) {
463      const char *crt1 = nullptr;
464      if (!Args.hasArg(options::OPT_shared)) {
465        if (Args.hasArg(options::OPT_pg))
466          crt1 = "gcrt1.o";
467        else if (IsPIE)
468          crt1 = "Scrt1.o";
469        else if (IsStaticPIE)
470          crt1 = "rcrt1.o";
471        else
472          crt1 = "crt1.o";
473      }
474      if (crt1)
475        CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crt1)));
476
477      CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crti.o")));
478    }
479
480    if (IsIAMCU)
481      CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crt0.o")));
482    else if (HasCRTBeginEndFiles) {
483      std::string P;
484      if (ToolChain.GetRuntimeLibType(Args) == ToolChain::RLT_CompilerRT &&
485          !isAndroid) {
486        std::string crtbegin = ToolChain.getCompilerRT(Args, "crtbegin",
487                                                       ToolChain::FT_Object);
488        if (ToolChain.getVFS().exists(crtbegin))
489          P = crtbegin;
490      }
491      if (P.empty()) {
492        const char *crtbegin;
493        if (IsStatic)
494          crtbegin = isAndroid ? "crtbegin_static.o" : "crtbeginT.o";
495        else if (Args.hasArg(options::OPT_shared))
496          crtbegin = isAndroid ? "crtbegin_so.o" : "crtbeginS.o";
497        else if (IsPIE || IsStaticPIE)
498          crtbegin = isAndroid ? "crtbegin_dynamic.o" : "crtbeginS.o";
499        else
500          crtbegin = isAndroid ? "crtbegin_dynamic.o" : "crtbegin.o";
501        P = ToolChain.GetFilePath(crtbegin);
502      }
503      CmdArgs.push_back(Args.MakeArgString(P));
504    }
505
506    // Add crtfastmath.o if available and fast math is enabled.
507    ToolChain.AddFastMathRuntimeIfAvailable(Args, CmdArgs);
508  }
509
510  Args.AddAllArgs(CmdArgs, options::OPT_L);
511  Args.AddAllArgs(CmdArgs, options::OPT_u);
512
513  ToolChain.AddFilePathLibArgs(Args, CmdArgs);
514
515  if (D.isUsingLTO()) {
516    assert(!Inputs.empty() && "Must have at least one input.");
517    AddGoldPlugin(ToolChain, Args, CmdArgs, Output, Inputs[0],
518                  D.getLTOMode() == LTOK_Thin);
519  }
520
521  if (Args.hasArg(options::OPT_Z_Xlinker__no_demangle))
522    CmdArgs.push_back("--no-demangle");
523
524  bool NeedsSanitizerDeps = addSanitizerRuntimes(ToolChain, Args, CmdArgs);
525  bool NeedsXRayDeps = addXRayRuntime(ToolChain, Args, CmdArgs);
526  AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);
527  // The profile runtime also needs access to system libraries.
528  getToolChain().addProfileRTLibs(Args, CmdArgs);
529
530  if (D.CCCIsCXX() &&
531      !Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
532    if (ToolChain.ShouldLinkCXXStdlib(Args)) {
533      bool OnlyLibstdcxxStatic = Args.hasArg(options::OPT_static_libstdcxx) &&
534                                 !Args.hasArg(options::OPT_static);
535      if (OnlyLibstdcxxStatic)
536        CmdArgs.push_back("-Bstatic");
537      ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
538      if (OnlyLibstdcxxStatic)
539        CmdArgs.push_back("-Bdynamic");
540    }
541    CmdArgs.push_back("-lm");
542  }
543  // Silence warnings when linking C code with a C++ '-stdlib' argument.
544  Args.ClaimAllArgs(options::OPT_stdlib_EQ);
545
546  if (!Args.hasArg(options::OPT_nostdlib)) {
547    if (!Args.hasArg(options::OPT_nodefaultlibs)) {
548      if (IsStatic || IsStaticPIE)
549        CmdArgs.push_back("--start-group");
550
551      if (NeedsSanitizerDeps)
552        linkSanitizerRuntimeDeps(ToolChain, CmdArgs);
553
554      if (NeedsXRayDeps)
555        linkXRayRuntimeDeps(ToolChain, CmdArgs);
556
557      bool WantPthread = Args.hasArg(options::OPT_pthread) ||
558                         Args.hasArg(options::OPT_pthreads);
559
560      // Use the static OpenMP runtime with -static-openmp
561      bool StaticOpenMP = Args.hasArg(options::OPT_static_openmp) &&
562                          !Args.hasArg(options::OPT_static);
563
564      // FIXME: Only pass GompNeedsRT = true for platforms with libgomp that
565      // require librt. Most modern Linux platforms do, but some may not.
566      if (addOpenMPRuntime(CmdArgs, ToolChain, Args, StaticOpenMP,
567                           JA.isHostOffloading(Action::OFK_OpenMP),
568                           /* GompNeedsRT= */ true))
569        // OpenMP runtimes implies pthreads when using the GNU toolchain.
570        // FIXME: Does this really make sense for all GNU toolchains?
571        WantPthread = true;
572
573      AddRunTimeLibs(ToolChain, D, CmdArgs, Args);
574
575      if (WantPthread && !isAndroid)
576        CmdArgs.push_back("-lpthread");
577
578      if (Args.hasArg(options::OPT_fsplit_stack))
579        CmdArgs.push_back("--wrap=pthread_create");
580
581      if (!Args.hasArg(options::OPT_nolibc))
582        CmdArgs.push_back("-lc");
583
584      // Add IAMCU specific libs, if needed.
585      if (IsIAMCU)
586        CmdArgs.push_back("-lgloss");
587
588      if (IsStatic || IsStaticPIE)
589        CmdArgs.push_back("--end-group");
590      else
591        AddRunTimeLibs(ToolChain, D, CmdArgs, Args);
592
593      // Add IAMCU specific libs (outside the group), if needed.
594      if (IsIAMCU) {
595        CmdArgs.push_back("--as-needed");
596        CmdArgs.push_back("-lsoftfp");
597        CmdArgs.push_back("--no-as-needed");
598      }
599    }
600
601    if (!Args.hasArg(options::OPT_nostartfiles) && !IsIAMCU) {
602      if (HasCRTBeginEndFiles) {
603        std::string P;
604        if (ToolChain.GetRuntimeLibType(Args) == ToolChain::RLT_CompilerRT &&
605            !isAndroid) {
606          std::string crtend = ToolChain.getCompilerRT(Args, "crtend",
607                                                       ToolChain::FT_Object);
608          if (ToolChain.getVFS().exists(crtend))
609            P = crtend;
610        }
611        if (P.empty()) {
612          const char *crtend;
613          if (Args.hasArg(options::OPT_shared))
614            crtend = isAndroid ? "crtend_so.o" : "crtendS.o";
615          else if (IsPIE || IsStaticPIE)
616            crtend = isAndroid ? "crtend_android.o" : "crtendS.o";
617          else
618            crtend = isAndroid ? "crtend_android.o" : "crtend.o";
619          P = ToolChain.GetFilePath(crtend);
620        }
621        CmdArgs.push_back(Args.MakeArgString(P));
622      }
623      if (!isAndroid)
624        CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crtn.o")));
625    }
626  }
627
628  // Add HIP offloading linker script args if required.
629  AddHIPLinkerScript(getToolChain(), C, Output, Inputs, Args, CmdArgs, JA,
630                     *this);
631
632  const char *Exec = Args.MakeArgString(ToolChain.GetLinkerPath());
633  C.addCommand(std::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));
634}
635
636void tools::gnutools::Assembler::ConstructJob(Compilation &C,
637                                              const JobAction &JA,
638                                              const InputInfo &Output,
639                                              const InputInfoList &Inputs,
640                                              const ArgList &Args,
641                                              const char *LinkingOutput) const {
642  const auto &D = getToolChain().getDriver();
643
644  claimNoWarnArgs(Args);
645
646  ArgStringList CmdArgs;
647
648  llvm::Reloc::Model RelocationModel;
649  unsigned PICLevel;
650  bool IsPIE;
651  std::tie(RelocationModel, PICLevel, IsPIE) =
652      ParsePICArgs(getToolChain(), Args);
653
654  if (const Arg *A = Args.getLastArg(options::OPT_gz, options::OPT_gz_EQ)) {
655    if (A->getOption().getID() == options::OPT_gz) {
656      CmdArgs.push_back("--compress-debug-sections");
657    } else {
658      StringRef Value = A->getValue();
659      if (Value == "none" || Value == "zlib" || Value == "zlib-gnu") {
660        CmdArgs.push_back(
661            Args.MakeArgString("--compress-debug-sections=" + Twine(Value)));
662      } else {
663        D.Diag(diag::err_drv_unsupported_option_argument)
664            << A->getOption().getName() << Value;
665      }
666    }
667  }
668
669  if (getToolChain().isNoExecStackDefault()) {
670      CmdArgs.push_back("--noexecstack");
671  }
672
673  switch (getToolChain().getArch()) {
674  default:
675    break;
676  // Add --32/--64 to make sure we get the format we want.
677  // This is incomplete
678  case llvm::Triple::x86:
679    CmdArgs.push_back("--32");
680    break;
681  case llvm::Triple::x86_64:
682    if (getToolChain().getTriple().getEnvironment() == llvm::Triple::GNUX32)
683      CmdArgs.push_back("--x32");
684    else
685      CmdArgs.push_back("--64");
686    break;
687  case llvm::Triple::ppc: {
688    CmdArgs.push_back("-a32");
689    CmdArgs.push_back("-mppc");
690    CmdArgs.push_back(
691      ppc::getPPCAsmModeForCPU(getCPUName(Args, getToolChain().getTriple())));
692    break;
693  }
694  case llvm::Triple::ppc64: {
695    CmdArgs.push_back("-a64");
696    CmdArgs.push_back("-mppc64");
697    CmdArgs.push_back(
698      ppc::getPPCAsmModeForCPU(getCPUName(Args, getToolChain().getTriple())));
699    break;
700  }
701  case llvm::Triple::ppc64le: {
702    CmdArgs.push_back("-a64");
703    CmdArgs.push_back("-mppc64");
704    CmdArgs.push_back("-mlittle-endian");
705    CmdArgs.push_back(
706      ppc::getPPCAsmModeForCPU(getCPUName(Args, getToolChain().getTriple())));
707    break;
708  }
709  case llvm::Triple::riscv32:
710  case llvm::Triple::riscv64: {
711    StringRef ABIName = riscv::getRISCVABI(Args, getToolChain().getTriple());
712    CmdArgs.push_back("-mabi");
713    CmdArgs.push_back(ABIName.data());
714    StringRef MArchName = riscv::getRISCVArch(Args, getToolChain().getTriple());
715    CmdArgs.push_back("-march");
716    CmdArgs.push_back(MArchName.data());
717    break;
718  }
719  case llvm::Triple::sparc:
720  case llvm::Triple::sparcel: {
721    CmdArgs.push_back("-32");
722    std::string CPU = getCPUName(Args, getToolChain().getTriple());
723    CmdArgs.push_back(
724        sparc::getSparcAsmModeForCPU(CPU, getToolChain().getTriple()));
725    AddAssemblerKPIC(getToolChain(), Args, CmdArgs);
726    break;
727  }
728  case llvm::Triple::sparcv9: {
729    CmdArgs.push_back("-64");
730    std::string CPU = getCPUName(Args, getToolChain().getTriple());
731    CmdArgs.push_back(
732        sparc::getSparcAsmModeForCPU(CPU, getToolChain().getTriple()));
733    AddAssemblerKPIC(getToolChain(), Args, CmdArgs);
734    break;
735  }
736  case llvm::Triple::arm:
737  case llvm::Triple::armeb:
738  case llvm::Triple::thumb:
739  case llvm::Triple::thumbeb: {
740    const llvm::Triple &Triple2 = getToolChain().getTriple();
741    CmdArgs.push_back(isArmBigEndian(Triple2, Args) ? "-EB" : "-EL");
742    switch (Triple2.getSubArch()) {
743    case llvm::Triple::ARMSubArch_v7:
744      CmdArgs.push_back("-mfpu=neon");
745      break;
746    case llvm::Triple::ARMSubArch_v8:
747      CmdArgs.push_back("-mfpu=crypto-neon-fp-armv8");
748      break;
749    default:
750      break;
751    }
752
753    switch (arm::getARMFloatABI(getToolChain(), Args)) {
754    case arm::FloatABI::Invalid: llvm_unreachable("must have an ABI!");
755    case arm::FloatABI::Soft:
756      CmdArgs.push_back(Args.MakeArgString("-mfloat-abi=soft"));
757      break;
758    case arm::FloatABI::SoftFP:
759      CmdArgs.push_back(Args.MakeArgString("-mfloat-abi=softfp"));
760      break;
761    case arm::FloatABI::Hard:
762      CmdArgs.push_back(Args.MakeArgString("-mfloat-abi=hard"));
763      break;
764    }
765
766    Args.AddLastArg(CmdArgs, options::OPT_march_EQ);
767    normalizeCPUNamesForAssembler(Args, CmdArgs);
768
769    Args.AddLastArg(CmdArgs, options::OPT_mfpu_EQ);
770    break;
771  }
772  case llvm::Triple::aarch64:
773  case llvm::Triple::aarch64_be: {
774    CmdArgs.push_back(
775        getToolChain().getArch() == llvm::Triple::aarch64_be ? "-EB" : "-EL");
776    Args.AddLastArg(CmdArgs, options::OPT_march_EQ);
777    normalizeCPUNamesForAssembler(Args, CmdArgs);
778
779    break;
780  }
781  case llvm::Triple::mips:
782  case llvm::Triple::mipsel:
783  case llvm::Triple::mips64:
784  case llvm::Triple::mips64el: {
785    StringRef CPUName;
786    StringRef ABIName;
787    mips::getMipsCPUAndABI(Args, getToolChain().getTriple(), CPUName, ABIName);
788    ABIName = mips::getGnuCompatibleMipsABIName(ABIName);
789
790    CmdArgs.push_back("-march");
791    CmdArgs.push_back(CPUName.data());
792
793    CmdArgs.push_back("-mabi");
794    CmdArgs.push_back(ABIName.data());
795
796    // -mno-shared should be emitted unless -fpic, -fpie, -fPIC, -fPIE,
797    // or -mshared (not implemented) is in effect.
798    if (RelocationModel == llvm::Reloc::Static)
799      CmdArgs.push_back("-mno-shared");
800
801    // LLVM doesn't support -mplt yet and acts as if it is always given.
802    // However, -mplt has no effect with the N64 ABI.
803    if (ABIName != "64" && !Args.hasArg(options::OPT_mno_abicalls))
804      CmdArgs.push_back("-call_nonpic");
805
806    if (getToolChain().getTriple().isLittleEndian())
807      CmdArgs.push_back("-EL");
808    else
809      CmdArgs.push_back("-EB");
810
811    if (Arg *A = Args.getLastArg(options::OPT_mnan_EQ)) {
812      if (StringRef(A->getValue()) == "2008")
813        CmdArgs.push_back(Args.MakeArgString("-mnan=2008"));
814    }
815
816    // Add the last -mfp32/-mfpxx/-mfp64 or -mfpxx if it is enabled by default.
817    if (Arg *A = Args.getLastArg(options::OPT_mfp32, options::OPT_mfpxx,
818                                 options::OPT_mfp64)) {
819      A->claim();
820      A->render(Args, CmdArgs);
821    } else if (mips::shouldUseFPXX(
822                   Args, getToolChain().getTriple(), CPUName, ABIName,
823                   mips::getMipsFloatABI(getToolChain().getDriver(), Args,
824                                         getToolChain().getTriple())))
825      CmdArgs.push_back("-mfpxx");
826
827    // Pass on -mmips16 or -mno-mips16. However, the assembler equivalent of
828    // -mno-mips16 is actually -no-mips16.
829    if (Arg *A =
830            Args.getLastArg(options::OPT_mips16, options::OPT_mno_mips16)) {
831      if (A->getOption().matches(options::OPT_mips16)) {
832        A->claim();
833        A->render(Args, CmdArgs);
834      } else {
835        A->claim();
836        CmdArgs.push_back("-no-mips16");
837      }
838    }
839
840    Args.AddLastArg(CmdArgs, options::OPT_mmicromips,
841                    options::OPT_mno_micromips);
842    Args.AddLastArg(CmdArgs, options::OPT_mdsp, options::OPT_mno_dsp);
843    Args.AddLastArg(CmdArgs, options::OPT_mdspr2, options::OPT_mno_dspr2);
844
845    if (Arg *A = Args.getLastArg(options::OPT_mmsa, options::OPT_mno_msa)) {
846      // Do not use AddLastArg because not all versions of MIPS assembler
847      // support -mmsa / -mno-msa options.
848      if (A->getOption().matches(options::OPT_mmsa))
849        CmdArgs.push_back(Args.MakeArgString("-mmsa"));
850    }
851
852    Args.AddLastArg(CmdArgs, options::OPT_mhard_float,
853                    options::OPT_msoft_float);
854
855    Args.AddLastArg(CmdArgs, options::OPT_mdouble_float,
856                    options::OPT_msingle_float);
857
858    Args.AddLastArg(CmdArgs, options::OPT_modd_spreg,
859                    options::OPT_mno_odd_spreg);
860
861    AddAssemblerKPIC(getToolChain(), Args, CmdArgs);
862    break;
863  }
864  case llvm::Triple::systemz: {
865    // Always pass an -march option, since our default of z10 is later
866    // than the GNU assembler's default.
867    std::string CPUName = systemz::getSystemZTargetCPU(Args);
868    CmdArgs.push_back(Args.MakeArgString("-march=" + CPUName));
869    break;
870  }
871  }
872
873  for (const Arg *A : Args.filtered(options::OPT_ffile_prefix_map_EQ,
874                                    options::OPT_fdebug_prefix_map_EQ)) {
875    StringRef Map = A->getValue();
876    if (Map.find('=') == StringRef::npos)
877      D.Diag(diag::err_drv_invalid_argument_to_option)
878          << Map << A->getOption().getName();
879    else {
880      CmdArgs.push_back(Args.MakeArgString("--debug-prefix-map"));
881      CmdArgs.push_back(Args.MakeArgString(Map));
882    }
883    A->claim();
884  }
885
886  Args.AddAllArgs(CmdArgs, options::OPT_I);
887  Args.AddAllArgValues(CmdArgs, options::OPT_Wa_COMMA, options::OPT_Xassembler);
888
889  CmdArgs.push_back("-o");
890  CmdArgs.push_back(Output.getFilename());
891
892  for (const auto &II : Inputs)
893    CmdArgs.push_back(II.getFilename());
894
895  const char *Exec = Args.MakeArgString(getToolChain().GetProgramPath("as"));
896  C.addCommand(std::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));
897
898  // Handle the debug info splitting at object creation time if we're
899  // creating an object.
900  // TODO: Currently only works on linux with newer objcopy.
901  if (Args.hasArg(options::OPT_gsplit_dwarf) &&
902      getToolChain().getTriple().isOSLinux())
903    SplitDebugInfo(getToolChain(), C, *this, JA, Args, Output,
904                   SplitDebugName(Args, Inputs[0], Output));
905}
906
907namespace {
908// Filter to remove Multilibs that don't exist as a suffix to Path
909class FilterNonExistent {
910  StringRef Base, File;
911  llvm::vfs::FileSystem &VFS;
912
913public:
914  FilterNonExistent(StringRef Base, StringRef File, llvm::vfs::FileSystem &VFS)
915      : Base(Base), File(File), VFS(VFS) {}
916  bool operator()(const Multilib &M) {
917    return !VFS.exists(Base + M.gccSuffix() + File);
918  }
919};
920} // end anonymous namespace
921
922static bool isSoftFloatABI(const ArgList &Args) {
923  Arg *A = Args.getLastArg(options::OPT_msoft_float, options::OPT_mhard_float,
924                           options::OPT_mfloat_abi_EQ);
925  if (!A)
926    return false;
927
928  return A->getOption().matches(options::OPT_msoft_float) ||
929         (A->getOption().matches(options::OPT_mfloat_abi_EQ) &&
930          A->getValue() == StringRef("soft"));
931}
932
933static bool isArmOrThumbArch(llvm::Triple::ArchType Arch) {
934  return Arch == llvm::Triple::arm || Arch == llvm::Triple::thumb;
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 bool isMSP430(llvm::Triple::ArchType Arch) {
952  return Arch == llvm::Triple::msp430;
953}
954
955static Multilib makeMultilib(StringRef commonSuffix) {
956  return Multilib(commonSuffix, commonSuffix, commonSuffix);
957}
958
959static bool findMipsCsMultilibs(const Multilib::flags_list &Flags,
960                                FilterNonExistent &NonExistent,
961                                DetectedMultilibs &Result) {
962  // Check for Code Sourcery toolchain multilibs
963  MultilibSet CSMipsMultilibs;
964  {
965    auto MArchMips16 = makeMultilib("/mips16").flag("+m32").flag("+mips16");
966
967    auto MArchMicroMips =
968        makeMultilib("/micromips").flag("+m32").flag("+mmicromips");
969
970    auto MArchDefault = makeMultilib("").flag("-mips16").flag("-mmicromips");
971
972    auto UCLibc = makeMultilib("/uclibc").flag("+muclibc");
973
974    auto SoftFloat = makeMultilib("/soft-float").flag("+msoft-float");
975
976    auto Nan2008 = makeMultilib("/nan2008").flag("+mnan=2008");
977
978    auto DefaultFloat =
979        makeMultilib("").flag("-msoft-float").flag("-mnan=2008");
980
981    auto BigEndian = makeMultilib("").flag("+EB").flag("-EL");
982
983    auto LittleEndian = makeMultilib("/el").flag("+EL").flag("-EB");
984
985    // Note that this one's osSuffix is ""
986    auto MAbi64 = makeMultilib("")
987                      .gccSuffix("/64")
988                      .includeSuffix("/64")
989                      .flag("+mabi=n64")
990                      .flag("-mabi=n32")
991                      .flag("-m32");
992
993    CSMipsMultilibs =
994        MultilibSet()
995            .Either(MArchMips16, MArchMicroMips, MArchDefault)
996            .Maybe(UCLibc)
997            .Either(SoftFloat, Nan2008, DefaultFloat)
998            .FilterOut("/micromips/nan2008")
999            .FilterOut("/mips16/nan2008")
1000            .Either(BigEndian, LittleEndian)
1001            .Maybe(MAbi64)
1002            .FilterOut("/mips16.*/64")
1003            .FilterOut("/micromips.*/64")
1004            .FilterOut(NonExistent)
1005            .setIncludeDirsCallback([](const Multilib &M) {
1006              std::vector<std::string> Dirs({"/include"});
1007              if (StringRef(M.includeSuffix()).startswith("/uclibc"))
1008                Dirs.push_back(
1009                    "/../../../../mips-linux-gnu/libc/uclibc/usr/include");
1010              else
1011                Dirs.push_back("/../../../../mips-linux-gnu/libc/usr/include");
1012              return Dirs;
1013            });
1014  }
1015
1016  MultilibSet DebianMipsMultilibs;
1017  {
1018    Multilib MAbiN32 =
1019        Multilib().gccSuffix("/n32").includeSuffix("/n32").flag("+mabi=n32");
1020
1021    Multilib M64 = Multilib()
1022                       .gccSuffix("/64")
1023                       .includeSuffix("/64")
1024                       .flag("+m64")
1025                       .flag("-m32")
1026                       .flag("-mabi=n32");
1027
1028    Multilib M32 = Multilib().flag("-m64").flag("+m32").flag("-mabi=n32");
1029
1030    DebianMipsMultilibs =
1031        MultilibSet().Either(M32, M64, MAbiN32).FilterOut(NonExistent);
1032  }
1033
1034  // Sort candidates. Toolchain that best meets the directories tree goes first.
1035  // Then select the first toolchains matches command line flags.
1036  MultilibSet *Candidates[] = {&CSMipsMultilibs, &DebianMipsMultilibs};
1037  if (CSMipsMultilibs.size() < DebianMipsMultilibs.size())
1038    std::iter_swap(Candidates, Candidates + 1);
1039  for (const MultilibSet *Candidate : Candidates) {
1040    if (Candidate->select(Flags, Result.SelectedMultilib)) {
1041      if (Candidate == &DebianMipsMultilibs)
1042        Result.BiarchSibling = Multilib();
1043      Result.Multilibs = *Candidate;
1044      return true;
1045    }
1046  }
1047  return false;
1048}
1049
1050static bool findMipsAndroidMultilibs(llvm::vfs::FileSystem &VFS, StringRef Path,
1051                                     const Multilib::flags_list &Flags,
1052                                     FilterNonExistent &NonExistent,
1053                                     DetectedMultilibs &Result) {
1054
1055  MultilibSet AndroidMipsMultilibs =
1056      MultilibSet()
1057          .Maybe(Multilib("/mips-r2").flag("+march=mips32r2"))
1058          .Maybe(Multilib("/mips-r6").flag("+march=mips32r6"))
1059          .FilterOut(NonExistent);
1060
1061  MultilibSet AndroidMipselMultilibs =
1062      MultilibSet()
1063          .Either(Multilib().flag("+march=mips32"),
1064                  Multilib("/mips-r2", "", "/mips-r2").flag("+march=mips32r2"),
1065                  Multilib("/mips-r6", "", "/mips-r6").flag("+march=mips32r6"))
1066          .FilterOut(NonExistent);
1067
1068  MultilibSet AndroidMips64elMultilibs =
1069      MultilibSet()
1070          .Either(
1071              Multilib().flag("+march=mips64r6"),
1072              Multilib("/32/mips-r1", "", "/mips-r1").flag("+march=mips32"),
1073              Multilib("/32/mips-r2", "", "/mips-r2").flag("+march=mips32r2"),
1074              Multilib("/32/mips-r6", "", "/mips-r6").flag("+march=mips32r6"))
1075          .FilterOut(NonExistent);
1076
1077  MultilibSet *MS = &AndroidMipsMultilibs;
1078  if (VFS.exists(Path + "/mips-r6"))
1079    MS = &AndroidMipselMultilibs;
1080  else if (VFS.exists(Path + "/32"))
1081    MS = &AndroidMips64elMultilibs;
1082  if (MS->select(Flags, Result.SelectedMultilib)) {
1083    Result.Multilibs = *MS;
1084    return true;
1085  }
1086  return false;
1087}
1088
1089static bool findMipsMuslMultilibs(const Multilib::flags_list &Flags,
1090                                  FilterNonExistent &NonExistent,
1091                                  DetectedMultilibs &Result) {
1092  // Musl toolchain multilibs
1093  MultilibSet MuslMipsMultilibs;
1094  {
1095    auto MArchMipsR2 = makeMultilib("")
1096                           .osSuffix("/mips-r2-hard-musl")
1097                           .flag("+EB")
1098                           .flag("-EL")
1099                           .flag("+march=mips32r2");
1100
1101    auto MArchMipselR2 = makeMultilib("/mipsel-r2-hard-musl")
1102                             .flag("-EB")
1103                             .flag("+EL")
1104                             .flag("+march=mips32r2");
1105
1106    MuslMipsMultilibs = MultilibSet().Either(MArchMipsR2, MArchMipselR2);
1107
1108    // Specify the callback that computes the include directories.
1109    MuslMipsMultilibs.setIncludeDirsCallback([](const Multilib &M) {
1110      return std::vector<std::string>(
1111          {"/../sysroot" + M.osSuffix() + "/usr/include"});
1112    });
1113  }
1114  if (MuslMipsMultilibs.select(Flags, Result.SelectedMultilib)) {
1115    Result.Multilibs = MuslMipsMultilibs;
1116    return true;
1117  }
1118  return false;
1119}
1120
1121static bool findMipsMtiMultilibs(const Multilib::flags_list &Flags,
1122                                 FilterNonExistent &NonExistent,
1123                                 DetectedMultilibs &Result) {
1124  // CodeScape MTI toolchain v1.2 and early.
1125  MultilibSet MtiMipsMultilibsV1;
1126  {
1127    auto MArchMips32 = makeMultilib("/mips32")
1128                           .flag("+m32")
1129                           .flag("-m64")
1130                           .flag("-mmicromips")
1131                           .flag("+march=mips32");
1132
1133    auto MArchMicroMips = makeMultilib("/micromips")
1134                              .flag("+m32")
1135                              .flag("-m64")
1136                              .flag("+mmicromips");
1137
1138    auto MArchMips64r2 = makeMultilib("/mips64r2")
1139                             .flag("-m32")
1140                             .flag("+m64")
1141                             .flag("+march=mips64r2");
1142
1143    auto MArchMips64 = makeMultilib("/mips64").flag("-m32").flag("+m64").flag(
1144        "-march=mips64r2");
1145
1146    auto MArchDefault = makeMultilib("")
1147                            .flag("+m32")
1148                            .flag("-m64")
1149                            .flag("-mmicromips")
1150                            .flag("+march=mips32r2");
1151
1152    auto Mips16 = makeMultilib("/mips16").flag("+mips16");
1153
1154    auto UCLibc = makeMultilib("/uclibc").flag("+muclibc");
1155
1156    auto MAbi64 =
1157        makeMultilib("/64").flag("+mabi=n64").flag("-mabi=n32").flag("-m32");
1158
1159    auto BigEndian = makeMultilib("").flag("+EB").flag("-EL");
1160
1161    auto LittleEndian = makeMultilib("/el").flag("+EL").flag("-EB");
1162
1163    auto SoftFloat = makeMultilib("/sof").flag("+msoft-float");
1164
1165    auto Nan2008 = makeMultilib("/nan2008").flag("+mnan=2008");
1166
1167    MtiMipsMultilibsV1 =
1168        MultilibSet()
1169            .Either(MArchMips32, MArchMicroMips, MArchMips64r2, MArchMips64,
1170                    MArchDefault)
1171            .Maybe(UCLibc)
1172            .Maybe(Mips16)
1173            .FilterOut("/mips64/mips16")
1174            .FilterOut("/mips64r2/mips16")
1175            .FilterOut("/micromips/mips16")
1176            .Maybe(MAbi64)
1177            .FilterOut("/micromips/64")
1178            .FilterOut("/mips32/64")
1179            .FilterOut("^/64")
1180            .FilterOut("/mips16/64")
1181            .Either(BigEndian, LittleEndian)
1182            .Maybe(SoftFloat)
1183            .Maybe(Nan2008)
1184            .FilterOut(".*sof/nan2008")
1185            .FilterOut(NonExistent)
1186            .setIncludeDirsCallback([](const Multilib &M) {
1187              std::vector<std::string> Dirs({"/include"});
1188              if (StringRef(M.includeSuffix()).startswith("/uclibc"))
1189                Dirs.push_back("/../../../../sysroot/uclibc/usr/include");
1190              else
1191                Dirs.push_back("/../../../../sysroot/usr/include");
1192              return Dirs;
1193            });
1194  }
1195
1196  // CodeScape IMG toolchain starting from v1.3.
1197  MultilibSet MtiMipsMultilibsV2;
1198  {
1199    auto BeHard = makeMultilib("/mips-r2-hard")
1200                      .flag("+EB")
1201                      .flag("-msoft-float")
1202                      .flag("-mnan=2008")
1203                      .flag("-muclibc");
1204    auto BeSoft = makeMultilib("/mips-r2-soft")
1205                      .flag("+EB")
1206                      .flag("+msoft-float")
1207                      .flag("-mnan=2008");
1208    auto ElHard = makeMultilib("/mipsel-r2-hard")
1209                      .flag("+EL")
1210                      .flag("-msoft-float")
1211                      .flag("-mnan=2008")
1212                      .flag("-muclibc");
1213    auto ElSoft = makeMultilib("/mipsel-r2-soft")
1214                      .flag("+EL")
1215                      .flag("+msoft-float")
1216                      .flag("-mnan=2008")
1217                      .flag("-mmicromips");
1218    auto BeHardNan = makeMultilib("/mips-r2-hard-nan2008")
1219                         .flag("+EB")
1220                         .flag("-msoft-float")
1221                         .flag("+mnan=2008")
1222                         .flag("-muclibc");
1223    auto ElHardNan = makeMultilib("/mipsel-r2-hard-nan2008")
1224                         .flag("+EL")
1225                         .flag("-msoft-float")
1226                         .flag("+mnan=2008")
1227                         .flag("-muclibc")
1228                         .flag("-mmicromips");
1229    auto BeHardNanUclibc = makeMultilib("/mips-r2-hard-nan2008-uclibc")
1230                               .flag("+EB")
1231                               .flag("-msoft-float")
1232                               .flag("+mnan=2008")
1233                               .flag("+muclibc");
1234    auto ElHardNanUclibc = makeMultilib("/mipsel-r2-hard-nan2008-uclibc")
1235                               .flag("+EL")
1236                               .flag("-msoft-float")
1237                               .flag("+mnan=2008")
1238                               .flag("+muclibc");
1239    auto BeHardUclibc = makeMultilib("/mips-r2-hard-uclibc")
1240                            .flag("+EB")
1241                            .flag("-msoft-float")
1242                            .flag("-mnan=2008")
1243                            .flag("+muclibc");
1244    auto ElHardUclibc = makeMultilib("/mipsel-r2-hard-uclibc")
1245                            .flag("+EL")
1246                            .flag("-msoft-float")
1247                            .flag("-mnan=2008")
1248                            .flag("+muclibc");
1249    auto ElMicroHardNan = makeMultilib("/micromipsel-r2-hard-nan2008")
1250                              .flag("+EL")
1251                              .flag("-msoft-float")
1252                              .flag("+mnan=2008")
1253                              .flag("+mmicromips");
1254    auto ElMicroSoft = makeMultilib("/micromipsel-r2-soft")
1255                           .flag("+EL")
1256                           .flag("+msoft-float")
1257                           .flag("-mnan=2008")
1258                           .flag("+mmicromips");
1259
1260    auto O32 =
1261        makeMultilib("/lib").osSuffix("").flag("-mabi=n32").flag("-mabi=n64");
1262    auto N32 =
1263        makeMultilib("/lib32").osSuffix("").flag("+mabi=n32").flag("-mabi=n64");
1264    auto N64 =
1265        makeMultilib("/lib64").osSuffix("").flag("-mabi=n32").flag("+mabi=n64");
1266
1267    MtiMipsMultilibsV2 =
1268        MultilibSet()
1269            .Either({BeHard, BeSoft, ElHard, ElSoft, BeHardNan, ElHardNan,
1270                     BeHardNanUclibc, ElHardNanUclibc, BeHardUclibc,
1271                     ElHardUclibc, ElMicroHardNan, ElMicroSoft})
1272            .Either(O32, N32, N64)
1273            .FilterOut(NonExistent)
1274            .setIncludeDirsCallback([](const Multilib &M) {
1275              return std::vector<std::string>({"/../../../../sysroot" +
1276                                               M.includeSuffix() +
1277                                               "/../usr/include"});
1278            })
1279            .setFilePathsCallback([](const Multilib &M) {
1280              return std::vector<std::string>(
1281                  {"/../../../../mips-mti-linux-gnu/lib" + M.gccSuffix()});
1282            });
1283  }
1284  for (auto Candidate : {&MtiMipsMultilibsV1, &MtiMipsMultilibsV2}) {
1285    if (Candidate->select(Flags, Result.SelectedMultilib)) {
1286      Result.Multilibs = *Candidate;
1287      return true;
1288    }
1289  }
1290  return false;
1291}
1292
1293static bool findMipsImgMultilibs(const Multilib::flags_list &Flags,
1294                                 FilterNonExistent &NonExistent,
1295                                 DetectedMultilibs &Result) {
1296  // CodeScape IMG toolchain v1.2 and early.
1297  MultilibSet ImgMultilibsV1;
1298  {
1299    auto Mips64r6 = makeMultilib("/mips64r6").flag("+m64").flag("-m32");
1300
1301    auto LittleEndian = makeMultilib("/el").flag("+EL").flag("-EB");
1302
1303    auto MAbi64 =
1304        makeMultilib("/64").flag("+mabi=n64").flag("-mabi=n32").flag("-m32");
1305
1306    ImgMultilibsV1 =
1307        MultilibSet()
1308            .Maybe(Mips64r6)
1309            .Maybe(MAbi64)
1310            .Maybe(LittleEndian)
1311            .FilterOut(NonExistent)
1312            .setIncludeDirsCallback([](const Multilib &M) {
1313              return std::vector<std::string>(
1314                  {"/include", "/../../../../sysroot/usr/include"});
1315            });
1316  }
1317
1318  // CodeScape IMG toolchain starting from v1.3.
1319  MultilibSet ImgMultilibsV2;
1320  {
1321    auto BeHard = makeMultilib("/mips-r6-hard")
1322                      .flag("+EB")
1323                      .flag("-msoft-float")
1324                      .flag("-mmicromips");
1325    auto BeSoft = makeMultilib("/mips-r6-soft")
1326                      .flag("+EB")
1327                      .flag("+msoft-float")
1328                      .flag("-mmicromips");
1329    auto ElHard = makeMultilib("/mipsel-r6-hard")
1330                      .flag("+EL")
1331                      .flag("-msoft-float")
1332                      .flag("-mmicromips");
1333    auto ElSoft = makeMultilib("/mipsel-r6-soft")
1334                      .flag("+EL")
1335                      .flag("+msoft-float")
1336                      .flag("-mmicromips");
1337    auto BeMicroHard = makeMultilib("/micromips-r6-hard")
1338                           .flag("+EB")
1339                           .flag("-msoft-float")
1340                           .flag("+mmicromips");
1341    auto BeMicroSoft = makeMultilib("/micromips-r6-soft")
1342                           .flag("+EB")
1343                           .flag("+msoft-float")
1344                           .flag("+mmicromips");
1345    auto ElMicroHard = makeMultilib("/micromipsel-r6-hard")
1346                           .flag("+EL")
1347                           .flag("-msoft-float")
1348                           .flag("+mmicromips");
1349    auto ElMicroSoft = makeMultilib("/micromipsel-r6-soft")
1350                           .flag("+EL")
1351                           .flag("+msoft-float")
1352                           .flag("+mmicromips");
1353
1354    auto O32 =
1355        makeMultilib("/lib").osSuffix("").flag("-mabi=n32").flag("-mabi=n64");
1356    auto N32 =
1357        makeMultilib("/lib32").osSuffix("").flag("+mabi=n32").flag("-mabi=n64");
1358    auto N64 =
1359        makeMultilib("/lib64").osSuffix("").flag("-mabi=n32").flag("+mabi=n64");
1360
1361    ImgMultilibsV2 =
1362        MultilibSet()
1363            .Either({BeHard, BeSoft, ElHard, ElSoft, BeMicroHard, BeMicroSoft,
1364                     ElMicroHard, ElMicroSoft})
1365            .Either(O32, N32, N64)
1366            .FilterOut(NonExistent)
1367            .setIncludeDirsCallback([](const Multilib &M) {
1368              return std::vector<std::string>({"/../../../../sysroot" +
1369                                               M.includeSuffix() +
1370                                               "/../usr/include"});
1371            })
1372            .setFilePathsCallback([](const Multilib &M) {
1373              return std::vector<std::string>(
1374                  {"/../../../../mips-img-linux-gnu/lib" + M.gccSuffix()});
1375            });
1376  }
1377  for (auto Candidate : {&ImgMultilibsV1, &ImgMultilibsV2}) {
1378    if (Candidate->select(Flags, Result.SelectedMultilib)) {
1379      Result.Multilibs = *Candidate;
1380      return true;
1381    }
1382  }
1383  return false;
1384}
1385
1386bool clang::driver::findMIPSMultilibs(const Driver &D,
1387                                      const llvm::Triple &TargetTriple,
1388                                      StringRef Path, const ArgList &Args,
1389                                      DetectedMultilibs &Result) {
1390  FilterNonExistent NonExistent(Path, "/crtbegin.o", D.getVFS());
1391
1392  StringRef CPUName;
1393  StringRef ABIName;
1394  tools::mips::getMipsCPUAndABI(Args, TargetTriple, CPUName, ABIName);
1395
1396  llvm::Triple::ArchType TargetArch = TargetTriple.getArch();
1397
1398  Multilib::flags_list Flags;
1399  addMultilibFlag(TargetTriple.isMIPS32(), "m32", Flags);
1400  addMultilibFlag(TargetTriple.isMIPS64(), "m64", Flags);
1401  addMultilibFlag(isMips16(Args), "mips16", Flags);
1402  addMultilibFlag(CPUName == "mips32", "march=mips32", Flags);
1403  addMultilibFlag(CPUName == "mips32r2" || CPUName == "mips32r3" ||
1404                      CPUName == "mips32r5" || CPUName == "p5600",
1405                  "march=mips32r2", Flags);
1406  addMultilibFlag(CPUName == "mips32r6", "march=mips32r6", Flags);
1407  addMultilibFlag(CPUName == "mips64", "march=mips64", Flags);
1408  addMultilibFlag(CPUName == "mips64r2" || CPUName == "mips64r3" ||
1409                      CPUName == "mips64r5" || CPUName == "octeon" ||
1410                      CPUName == "octeon+",
1411                  "march=mips64r2", Flags);
1412  addMultilibFlag(CPUName == "mips64r6", "march=mips64r6", Flags);
1413  addMultilibFlag(isMicroMips(Args), "mmicromips", Flags);
1414  addMultilibFlag(tools::mips::isUCLibc(Args), "muclibc", Flags);
1415  addMultilibFlag(tools::mips::isNaN2008(Args, TargetTriple), "mnan=2008",
1416                  Flags);
1417  addMultilibFlag(ABIName == "n32", "mabi=n32", Flags);
1418  addMultilibFlag(ABIName == "n64", "mabi=n64", Flags);
1419  addMultilibFlag(isSoftFloatABI(Args), "msoft-float", Flags);
1420  addMultilibFlag(!isSoftFloatABI(Args), "mhard-float", Flags);
1421  addMultilibFlag(isMipsEL(TargetArch), "EL", Flags);
1422  addMultilibFlag(!isMipsEL(TargetArch), "EB", Flags);
1423
1424  if (TargetTriple.isAndroid())
1425    return findMipsAndroidMultilibs(D.getVFS(), Path, Flags, NonExistent,
1426                                    Result);
1427
1428  if (TargetTriple.getVendor() == llvm::Triple::MipsTechnologies &&
1429      TargetTriple.getOS() == llvm::Triple::Linux &&
1430      TargetTriple.getEnvironment() == llvm::Triple::UnknownEnvironment)
1431    return findMipsMuslMultilibs(Flags, NonExistent, Result);
1432
1433  if (TargetTriple.getVendor() == llvm::Triple::MipsTechnologies &&
1434      TargetTriple.getOS() == llvm::Triple::Linux &&
1435      TargetTriple.isGNUEnvironment())
1436    return findMipsMtiMultilibs(Flags, NonExistent, Result);
1437
1438  if (TargetTriple.getVendor() == llvm::Triple::ImaginationTechnologies &&
1439      TargetTriple.getOS() == llvm::Triple::Linux &&
1440      TargetTriple.isGNUEnvironment())
1441    return findMipsImgMultilibs(Flags, NonExistent, Result);
1442
1443  if (findMipsCsMultilibs(Flags, NonExistent, Result))
1444    return true;
1445
1446  // Fallback to the regular toolchain-tree structure.
1447  Multilib Default;
1448  Result.Multilibs.push_back(Default);
1449  Result.Multilibs.FilterOut(NonExistent);
1450
1451  if (Result.Multilibs.select(Flags, Result.SelectedMultilib)) {
1452    Result.BiarchSibling = Multilib();
1453    return true;
1454  }
1455
1456  return false;
1457}
1458
1459static void findAndroidArmMultilibs(const Driver &D,
1460                                    const llvm::Triple &TargetTriple,
1461                                    StringRef Path, const ArgList &Args,
1462                                    DetectedMultilibs &Result) {
1463  // Find multilibs with subdirectories like armv7-a, thumb, armv7-a/thumb.
1464  FilterNonExistent NonExistent(Path, "/crtbegin.o", D.getVFS());
1465  Multilib ArmV7Multilib = makeMultilib("/armv7-a")
1466                               .flag("+march=armv7-a")
1467                               .flag("-mthumb");
1468  Multilib ThumbMultilib = makeMultilib("/thumb")
1469                               .flag("-march=armv7-a")
1470                               .flag("+mthumb");
1471  Multilib ArmV7ThumbMultilib = makeMultilib("/armv7-a/thumb")
1472                               .flag("+march=armv7-a")
1473                               .flag("+mthumb");
1474  Multilib DefaultMultilib = makeMultilib("")
1475                               .flag("-march=armv7-a")
1476                               .flag("-mthumb");
1477  MultilibSet AndroidArmMultilibs =
1478      MultilibSet()
1479          .Either(ThumbMultilib, ArmV7Multilib,
1480                  ArmV7ThumbMultilib, DefaultMultilib)
1481          .FilterOut(NonExistent);
1482
1483  Multilib::flags_list Flags;
1484  llvm::StringRef Arch = Args.getLastArgValue(options::OPT_march_EQ);
1485  bool IsArmArch = TargetTriple.getArch() == llvm::Triple::arm;
1486  bool IsThumbArch = TargetTriple.getArch() == llvm::Triple::thumb;
1487  bool IsV7SubArch = TargetTriple.getSubArch() == llvm::Triple::ARMSubArch_v7;
1488  bool IsThumbMode = IsThumbArch ||
1489      Args.hasFlag(options::OPT_mthumb, options::OPT_mno_thumb, false) ||
1490      (IsArmArch && llvm::ARM::parseArchISA(Arch) == llvm::ARM::ISAKind::THUMB);
1491  bool IsArmV7Mode = (IsArmArch || IsThumbArch) &&
1492      (llvm::ARM::parseArchVersion(Arch) == 7 ||
1493       (IsArmArch && Arch == "" && IsV7SubArch));
1494  addMultilibFlag(IsArmV7Mode, "march=armv7-a", Flags);
1495  addMultilibFlag(IsThumbMode, "mthumb", Flags);
1496
1497  if (AndroidArmMultilibs.select(Flags, Result.SelectedMultilib))
1498    Result.Multilibs = AndroidArmMultilibs;
1499}
1500
1501static bool findMSP430Multilibs(const Driver &D,
1502                                const llvm::Triple &TargetTriple,
1503                                StringRef Path, const ArgList &Args,
1504                                DetectedMultilibs &Result) {
1505  FilterNonExistent NonExistent(Path, "/crtbegin.o", D.getVFS());
1506  Multilib MSP430Multilib = makeMultilib("/430");
1507  // FIXME: when clang starts to support msp430x ISA additional logic
1508  // to select between multilib must be implemented
1509  // Multilib MSP430xMultilib = makeMultilib("/large");
1510
1511  Result.Multilibs.push_back(MSP430Multilib);
1512  Result.Multilibs.FilterOut(NonExistent);
1513
1514  Multilib::flags_list Flags;
1515  if (Result.Multilibs.select(Flags, Result.SelectedMultilib))
1516    return true;
1517
1518  return false;
1519}
1520
1521static void findRISCVBareMetalMultilibs(const Driver &D,
1522                                        const llvm::Triple &TargetTriple,
1523                                        StringRef Path, const ArgList &Args,
1524                                        DetectedMultilibs &Result) {
1525  FilterNonExistent NonExistent(Path, "/crtbegin.o", D.getVFS());
1526  struct RiscvMultilib {
1527    StringRef march;
1528    StringRef mabi;
1529  };
1530  // currently only support the set of multilibs like riscv-gnu-toolchain does.
1531  // TODO: support MULTILIB_REUSE
1532  SmallVector<RiscvMultilib, 8> RISCVMultilibSet = {
1533      {"rv32i", "ilp32"},     {"rv32im", "ilp32"},     {"rv32iac", "ilp32"},
1534      {"rv32imac", "ilp32"},  {"rv32imafc", "ilp32f"}, {"rv64imac", "lp64"},
1535      {"rv64imafdc", "lp64d"}};
1536
1537  std::vector<Multilib> Ms;
1538  for (auto Element : RISCVMultilibSet) {
1539    // multilib path rule is ${march}/${mabi}
1540    Ms.emplace_back(
1541        makeMultilib((Twine(Element.march) + "/" + Twine(Element.mabi)).str())
1542            .flag(Twine("+march=", Element.march).str())
1543            .flag(Twine("+mabi=", Element.mabi).str()));
1544  }
1545  MultilibSet RISCVMultilibs =
1546      MultilibSet()
1547          .Either(ArrayRef<Multilib>(Ms))
1548          .FilterOut(NonExistent)
1549          .setFilePathsCallback([](const Multilib &M) {
1550            return std::vector<std::string>(
1551                {M.gccSuffix(),
1552                 "/../../../../riscv64-unknown-elf/lib" + M.gccSuffix(),
1553                 "/../../../../riscv32-unknown-elf/lib" + M.gccSuffix()});
1554          });
1555
1556
1557  Multilib::flags_list Flags;
1558  llvm::StringSet<> Added_ABIs;
1559  StringRef ABIName = tools::riscv::getRISCVABI(Args, TargetTriple);
1560  StringRef MArch = tools::riscv::getRISCVArch(Args, TargetTriple);
1561  for (auto Element : RISCVMultilibSet) {
1562    addMultilibFlag(MArch == Element.march,
1563                    Twine("march=", Element.march).str().c_str(), Flags);
1564    if (!Added_ABIs.count(Element.mabi)) {
1565      Added_ABIs.insert(Element.mabi);
1566      addMultilibFlag(ABIName == Element.mabi,
1567                      Twine("mabi=", Element.mabi).str().c_str(), Flags);
1568    }
1569  }
1570
1571  if (RISCVMultilibs.select(Flags, Result.SelectedMultilib))
1572    Result.Multilibs = RISCVMultilibs;
1573}
1574
1575static void findRISCVMultilibs(const Driver &D,
1576                               const llvm::Triple &TargetTriple, StringRef Path,
1577                               const ArgList &Args, DetectedMultilibs &Result) {
1578  if (TargetTriple.getOS() == llvm::Triple::UnknownOS)
1579    return findRISCVBareMetalMultilibs(D, TargetTriple, Path, Args, Result);
1580
1581  FilterNonExistent NonExistent(Path, "/crtbegin.o", D.getVFS());
1582  Multilib Ilp32 = makeMultilib("lib32/ilp32").flag("+m32").flag("+mabi=ilp32");
1583  Multilib Ilp32f =
1584      makeMultilib("lib32/ilp32f").flag("+m32").flag("+mabi=ilp32f");
1585  Multilib Ilp32d =
1586      makeMultilib("lib32/ilp32d").flag("+m32").flag("+mabi=ilp32d");
1587  Multilib Lp64 = makeMultilib("lib64/lp64").flag("+m64").flag("+mabi=lp64");
1588  Multilib Lp64f = makeMultilib("lib64/lp64f").flag("+m64").flag("+mabi=lp64f");
1589  Multilib Lp64d = makeMultilib("lib64/lp64d").flag("+m64").flag("+mabi=lp64d");
1590  MultilibSet RISCVMultilibs =
1591      MultilibSet()
1592          .Either({Ilp32, Ilp32f, Ilp32d, Lp64, Lp64f, Lp64d})
1593          .FilterOut(NonExistent);
1594
1595  Multilib::flags_list Flags;
1596  bool IsRV64 = TargetTriple.getArch() == llvm::Triple::riscv64;
1597  StringRef ABIName = tools::riscv::getRISCVABI(Args, TargetTriple);
1598
1599  addMultilibFlag(!IsRV64, "m32", Flags);
1600  addMultilibFlag(IsRV64, "m64", Flags);
1601  addMultilibFlag(ABIName == "ilp32", "mabi=ilp32", Flags);
1602  addMultilibFlag(ABIName == "ilp32f", "mabi=ilp32f", Flags);
1603  addMultilibFlag(ABIName == "ilp32d", "mabi=ilp32d", Flags);
1604  addMultilibFlag(ABIName == "lp64", "mabi=lp64", Flags);
1605  addMultilibFlag(ABIName == "lp64f", "mabi=lp64f", Flags);
1606  addMultilibFlag(ABIName == "lp64d", "mabi=lp64d", Flags);
1607
1608  if (RISCVMultilibs.select(Flags, Result.SelectedMultilib))
1609    Result.Multilibs = RISCVMultilibs;
1610}
1611
1612static bool findBiarchMultilibs(const Driver &D,
1613                                const llvm::Triple &TargetTriple,
1614                                StringRef Path, const ArgList &Args,
1615                                bool NeedsBiarchSuffix,
1616                                DetectedMultilibs &Result) {
1617  Multilib Default;
1618
1619  // Some versions of SUSE and Fedora on ppc64 put 32-bit libs
1620  // in what would normally be GCCInstallPath and put the 64-bit
1621  // libs in a subdirectory named 64. The simple logic we follow is that
1622  // *if* there is a subdirectory of the right name with crtbegin.o in it,
1623  // we use that. If not, and if not a biarch triple alias, we look for
1624  // crtbegin.o without the subdirectory.
1625
1626  StringRef Suff64 = "/64";
1627  // Solaris uses platform-specific suffixes instead of /64.
1628  if (TargetTriple.getOS() == llvm::Triple::Solaris) {
1629    switch (TargetTriple.getArch()) {
1630    case llvm::Triple::x86:
1631    case llvm::Triple::x86_64:
1632      Suff64 = "/amd64";
1633      break;
1634    case llvm::Triple::sparc:
1635    case llvm::Triple::sparcv9:
1636      Suff64 = "/sparcv9";
1637      break;
1638    default:
1639      break;
1640    }
1641  }
1642
1643  Multilib Alt64 = Multilib()
1644                       .gccSuffix(Suff64)
1645                       .includeSuffix(Suff64)
1646                       .flag("-m32")
1647                       .flag("+m64")
1648                       .flag("-mx32");
1649  Multilib Alt32 = Multilib()
1650                       .gccSuffix("/32")
1651                       .includeSuffix("/32")
1652                       .flag("+m32")
1653                       .flag("-m64")
1654                       .flag("-mx32");
1655  Multilib Altx32 = Multilib()
1656                        .gccSuffix("/x32")
1657                        .includeSuffix("/x32")
1658                        .flag("-m32")
1659                        .flag("-m64")
1660                        .flag("+mx32");
1661
1662  // GCC toolchain for IAMCU doesn't have crtbegin.o, so look for libgcc.a.
1663  FilterNonExistent NonExistent(
1664      Path, TargetTriple.isOSIAMCU() ? "/libgcc.a" : "/crtbegin.o", D.getVFS());
1665
1666  // Determine default multilib from: 32, 64, x32
1667  // Also handle cases such as 64 on 32, 32 on 64, etc.
1668  enum { UNKNOWN, WANT32, WANT64, WANTX32 } Want = UNKNOWN;
1669  const bool IsX32 = TargetTriple.getEnvironment() == llvm::Triple::GNUX32;
1670  if (TargetTriple.isArch32Bit() && !NonExistent(Alt32))
1671    Want = WANT64;
1672  else if (TargetTriple.isArch64Bit() && IsX32 && !NonExistent(Altx32))
1673    Want = WANT64;
1674  else if (TargetTriple.isArch64Bit() && !IsX32 && !NonExistent(Alt64))
1675    Want = WANT32;
1676  else {
1677    if (TargetTriple.isArch32Bit())
1678      Want = NeedsBiarchSuffix ? WANT64 : WANT32;
1679    else if (IsX32)
1680      Want = NeedsBiarchSuffix ? WANT64 : WANTX32;
1681    else
1682      Want = NeedsBiarchSuffix ? WANT32 : WANT64;
1683  }
1684
1685  if (Want == WANT32)
1686    Default.flag("+m32").flag("-m64").flag("-mx32");
1687  else if (Want == WANT64)
1688    Default.flag("-m32").flag("+m64").flag("-mx32");
1689  else if (Want == WANTX32)
1690    Default.flag("-m32").flag("-m64").flag("+mx32");
1691  else
1692    return false;
1693
1694  Result.Multilibs.push_back(Default);
1695  Result.Multilibs.push_back(Alt64);
1696  Result.Multilibs.push_back(Alt32);
1697  Result.Multilibs.push_back(Altx32);
1698
1699  Result.Multilibs.FilterOut(NonExistent);
1700
1701  Multilib::flags_list Flags;
1702  addMultilibFlag(TargetTriple.isArch64Bit() && !IsX32, "m64", Flags);
1703  addMultilibFlag(TargetTriple.isArch32Bit(), "m32", Flags);
1704  addMultilibFlag(TargetTriple.isArch64Bit() && IsX32, "mx32", Flags);
1705
1706  if (!Result.Multilibs.select(Flags, Result.SelectedMultilib))
1707    return false;
1708
1709  if (Result.SelectedMultilib == Alt64 || Result.SelectedMultilib == Alt32 ||
1710      Result.SelectedMultilib == Altx32)
1711    Result.BiarchSibling = Default;
1712
1713  return true;
1714}
1715
1716/// Generic_GCC - A tool chain using the 'gcc' command to perform
1717/// all subcommands; this relies on gcc translating the majority of
1718/// command line options.
1719
1720/// Less-than for GCCVersion, implementing a Strict Weak Ordering.
1721bool Generic_GCC::GCCVersion::isOlderThan(int RHSMajor, int RHSMinor,
1722                                          int RHSPatch,
1723                                          StringRef RHSPatchSuffix) const {
1724  if (Major != RHSMajor)
1725    return Major < RHSMajor;
1726  if (Minor != RHSMinor)
1727    return Minor < RHSMinor;
1728  if (Patch != RHSPatch) {
1729    // Note that versions without a specified patch sort higher than those with
1730    // a patch.
1731    if (RHSPatch == -1)
1732      return true;
1733    if (Patch == -1)
1734      return false;
1735
1736    // Otherwise just sort on the patch itself.
1737    return Patch < RHSPatch;
1738  }
1739  if (PatchSuffix != RHSPatchSuffix) {
1740    // Sort empty suffixes higher.
1741    if (RHSPatchSuffix.empty())
1742      return true;
1743    if (PatchSuffix.empty())
1744      return false;
1745
1746    // Provide a lexicographic sort to make this a total ordering.
1747    return PatchSuffix < RHSPatchSuffix;
1748  }
1749
1750  // The versions are equal.
1751  return false;
1752}
1753
1754/// Parse a GCCVersion object out of a string of text.
1755///
1756/// This is the primary means of forming GCCVersion objects.
1757/*static*/
1758Generic_GCC::GCCVersion Generic_GCC::GCCVersion::Parse(StringRef VersionText) {
1759  const GCCVersion BadVersion = {VersionText.str(), -1, -1, -1, "", "", ""};
1760  std::pair<StringRef, StringRef> First = VersionText.split('.');
1761  std::pair<StringRef, StringRef> Second = First.second.split('.');
1762
1763  GCCVersion GoodVersion = {VersionText.str(), -1, -1, -1, "", "", ""};
1764  if (First.first.getAsInteger(10, GoodVersion.Major) || GoodVersion.Major < 0)
1765    return BadVersion;
1766  GoodVersion.MajorStr = First.first.str();
1767  if (First.second.empty())
1768    return GoodVersion;
1769  StringRef MinorStr = Second.first;
1770  if (Second.second.empty()) {
1771    if (size_t EndNumber = MinorStr.find_first_not_of("0123456789")) {
1772      GoodVersion.PatchSuffix = MinorStr.substr(EndNumber);
1773      MinorStr = MinorStr.slice(0, EndNumber);
1774    }
1775  }
1776  if (MinorStr.getAsInteger(10, GoodVersion.Minor) || GoodVersion.Minor < 0)
1777    return BadVersion;
1778  GoodVersion.MinorStr = MinorStr.str();
1779
1780  // First look for a number prefix and parse that if present. Otherwise just
1781  // stash the entire patch string in the suffix, and leave the number
1782  // unspecified. This covers versions strings such as:
1783  //   5        (handled above)
1784  //   4.4
1785  //   4.4-patched
1786  //   4.4.0
1787  //   4.4.x
1788  //   4.4.2-rc4
1789  //   4.4.x-patched
1790  // And retains any patch number it finds.
1791  StringRef PatchText = Second.second;
1792  if (!PatchText.empty()) {
1793    if (size_t EndNumber = PatchText.find_first_not_of("0123456789")) {
1794      // Try to parse the number and any suffix.
1795      if (PatchText.slice(0, EndNumber).getAsInteger(10, GoodVersion.Patch) ||
1796          GoodVersion.Patch < 0)
1797        return BadVersion;
1798      GoodVersion.PatchSuffix = PatchText.substr(EndNumber);
1799    }
1800  }
1801
1802  return GoodVersion;
1803}
1804
1805static llvm::StringRef getGCCToolchainDir(const ArgList &Args,
1806                                          llvm::StringRef SysRoot) {
1807  const Arg *A = Args.getLastArg(clang::driver::options::OPT_gcc_toolchain);
1808  if (A)
1809    return A->getValue();
1810
1811  // If we have a SysRoot, ignore GCC_INSTALL_PREFIX.
1812  // GCC_INSTALL_PREFIX specifies the gcc installation for the default
1813  // sysroot and is likely not valid with a different sysroot.
1814  if (!SysRoot.empty())
1815    return "";
1816
1817  return GCC_INSTALL_PREFIX;
1818}
1819
1820/// Initialize a GCCInstallationDetector from the driver.
1821///
1822/// This performs all of the autodetection and sets up the various paths.
1823/// Once constructed, a GCCInstallationDetector is essentially immutable.
1824///
1825/// FIXME: We shouldn't need an explicit TargetTriple parameter here, and
1826/// should instead pull the target out of the driver. This is currently
1827/// necessary because the driver doesn't store the final version of the target
1828/// triple.
1829void Generic_GCC::GCCInstallationDetector::init(
1830    const llvm::Triple &TargetTriple, const ArgList &Args,
1831    ArrayRef<std::string> ExtraTripleAliases) {
1832  llvm::Triple BiarchVariantTriple = TargetTriple.isArch32Bit()
1833                                         ? TargetTriple.get64BitArchVariant()
1834                                         : TargetTriple.get32BitArchVariant();
1835  // The library directories which may contain GCC installations.
1836  SmallVector<StringRef, 4> CandidateLibDirs, CandidateBiarchLibDirs;
1837  // The compatible GCC triples for this particular architecture.
1838  SmallVector<StringRef, 16> CandidateTripleAliases;
1839  SmallVector<StringRef, 16> CandidateBiarchTripleAliases;
1840  CollectLibDirsAndTriples(TargetTriple, BiarchVariantTriple, CandidateLibDirs,
1841                           CandidateTripleAliases, CandidateBiarchLibDirs,
1842                           CandidateBiarchTripleAliases);
1843
1844  // Compute the set of prefixes for our search.
1845  SmallVector<std::string, 8> Prefixes(D.PrefixDirs.begin(),
1846                                       D.PrefixDirs.end());
1847
1848  StringRef GCCToolchainDir = getGCCToolchainDir(Args, D.SysRoot);
1849  if (GCCToolchainDir != "") {
1850    if (GCCToolchainDir.back() == '/')
1851      GCCToolchainDir = GCCToolchainDir.drop_back(); // remove the /
1852
1853    Prefixes.push_back(GCCToolchainDir);
1854  } else {
1855    // If we have a SysRoot, try that first.
1856    if (!D.SysRoot.empty()) {
1857      Prefixes.push_back(D.SysRoot);
1858      AddDefaultGCCPrefixes(TargetTriple, Prefixes, D.SysRoot);
1859    }
1860
1861    // Then look for gcc installed alongside clang.
1862    Prefixes.push_back(D.InstalledDir + "/..");
1863
1864    // Next, look for prefix(es) that correspond to distribution-supplied gcc
1865    // installations.
1866    if (D.SysRoot.empty()) {
1867      // Typically /usr.
1868      AddDefaultGCCPrefixes(TargetTriple, Prefixes, D.SysRoot);
1869    }
1870  }
1871
1872  // Try to respect gcc-config on Gentoo. However, do that only
1873  // if --gcc-toolchain is not provided or equal to the Gentoo install
1874  // in /usr. This avoids accidentally enforcing the system GCC version
1875  // when using a custom toolchain.
1876  if (GCCToolchainDir == "" || GCCToolchainDir == D.SysRoot + "/usr") {
1877    SmallVector<StringRef, 16> GentooTestTriples;
1878    // Try to match an exact triple as target triple first.
1879    // e.g. crossdev -S x86_64-gentoo-linux-gnu will install gcc libs for
1880    // x86_64-gentoo-linux-gnu. But "clang -target x86_64-gentoo-linux-gnu"
1881    // may pick the libraries for x86_64-pc-linux-gnu even when exact matching
1882    // triple x86_64-gentoo-linux-gnu is present.
1883    GentooTestTriples.push_back(TargetTriple.str());
1884    // Check rest of triples.
1885    GentooTestTriples.append(ExtraTripleAliases.begin(),
1886                             ExtraTripleAliases.end());
1887    GentooTestTriples.append(CandidateTripleAliases.begin(),
1888                             CandidateTripleAliases.end());
1889    if (ScanGentooConfigs(TargetTriple, Args, GentooTestTriples,
1890                          CandidateBiarchTripleAliases))
1891      return;
1892  }
1893
1894  // Loop over the various components which exist and select the best GCC
1895  // installation available. GCC installs are ranked by version number.
1896  Version = GCCVersion::Parse("0.0.0");
1897  for (const std::string &Prefix : Prefixes) {
1898    if (!D.getVFS().exists(Prefix))
1899      continue;
1900    for (StringRef Suffix : CandidateLibDirs) {
1901      const std::string LibDir = Prefix + Suffix.str();
1902      if (!D.getVFS().exists(LibDir))
1903        continue;
1904      // Try to match the exact target triple first.
1905      ScanLibDirForGCCTriple(TargetTriple, Args, LibDir, TargetTriple.str());
1906      // Try rest of possible triples.
1907      for (StringRef Candidate : ExtraTripleAliases) // Try these first.
1908        ScanLibDirForGCCTriple(TargetTriple, Args, LibDir, Candidate);
1909      for (StringRef Candidate : CandidateTripleAliases)
1910        ScanLibDirForGCCTriple(TargetTriple, Args, LibDir, Candidate);
1911    }
1912    for (StringRef Suffix : CandidateBiarchLibDirs) {
1913      const std::string LibDir = Prefix + Suffix.str();
1914      if (!D.getVFS().exists(LibDir))
1915        continue;
1916      for (StringRef Candidate : CandidateBiarchTripleAliases)
1917        ScanLibDirForGCCTriple(TargetTriple, Args, LibDir, Candidate,
1918                               /*NeedsBiarchSuffix=*/ true);
1919    }
1920  }
1921}
1922
1923void Generic_GCC::GCCInstallationDetector::print(raw_ostream &OS) const {
1924  for (const auto &InstallPath : CandidateGCCInstallPaths)
1925    OS << "Found candidate GCC installation: " << InstallPath << "\n";
1926
1927  if (!GCCInstallPath.empty())
1928    OS << "Selected GCC installation: " << GCCInstallPath << "\n";
1929
1930  for (const auto &Multilib : Multilibs)
1931    OS << "Candidate multilib: " << Multilib << "\n";
1932
1933  if (Multilibs.size() != 0 || !SelectedMultilib.isDefault())
1934    OS << "Selected multilib: " << SelectedMultilib << "\n";
1935}
1936
1937bool Generic_GCC::GCCInstallationDetector::getBiarchSibling(Multilib &M) const {
1938  if (BiarchSibling.hasValue()) {
1939    M = BiarchSibling.getValue();
1940    return true;
1941  }
1942  return false;
1943}
1944
1945void Generic_GCC::GCCInstallationDetector::AddDefaultGCCPrefixes(
1946    const llvm::Triple &TargetTriple, SmallVectorImpl<std::string> &Prefixes,
1947    StringRef SysRoot) {
1948  if (TargetTriple.getOS() == llvm::Triple::Solaris) {
1949    // Solaris is a special case.
1950    // The GCC installation is under
1951    //   /usr/gcc/<major>.<minor>/lib/gcc/<triple>/<major>.<minor>.<patch>/
1952    // so we need to find those /usr/gcc/*/lib/gcc libdirs and go with
1953    // /usr/gcc/<version> as a prefix.
1954
1955    std::string PrefixDir = SysRoot.str() + "/usr/gcc";
1956    std::error_code EC;
1957    for (llvm::vfs::directory_iterator LI = D.getVFS().dir_begin(PrefixDir, EC),
1958                                       LE;
1959         !EC && LI != LE; LI = LI.increment(EC)) {
1960      StringRef VersionText = llvm::sys::path::filename(LI->path());
1961      GCCVersion CandidateVersion = GCCVersion::Parse(VersionText);
1962
1963      // Filter out obviously bad entries.
1964      if (CandidateVersion.Major == -1 || CandidateVersion.isOlderThan(4, 1, 1))
1965        continue;
1966
1967      std::string CandidatePrefix = PrefixDir + "/" + VersionText.str();
1968      std::string CandidateLibPath = CandidatePrefix + "/lib/gcc";
1969      if (!D.getVFS().exists(CandidateLibPath))
1970        continue;
1971
1972      Prefixes.push_back(CandidatePrefix);
1973    }
1974    return;
1975  }
1976
1977  // Non-Solaris is much simpler - most systems just go with "/usr".
1978  if (SysRoot.empty() && TargetTriple.getOS() == llvm::Triple::Linux) {
1979    // Yet, still look for RHEL devtoolsets.
1980    Prefixes.push_back("/opt/rh/devtoolset-8/root/usr");
1981    Prefixes.push_back("/opt/rh/devtoolset-7/root/usr");
1982    Prefixes.push_back("/opt/rh/devtoolset-6/root/usr");
1983    Prefixes.push_back("/opt/rh/devtoolset-4/root/usr");
1984    Prefixes.push_back("/opt/rh/devtoolset-3/root/usr");
1985    Prefixes.push_back("/opt/rh/devtoolset-2/root/usr");
1986  }
1987  Prefixes.push_back(SysRoot.str() + "/usr");
1988}
1989
1990/*static*/ void Generic_GCC::GCCInstallationDetector::CollectLibDirsAndTriples(
1991    const llvm::Triple &TargetTriple, const llvm::Triple &BiarchTriple,
1992    SmallVectorImpl<StringRef> &LibDirs,
1993    SmallVectorImpl<StringRef> &TripleAliases,
1994    SmallVectorImpl<StringRef> &BiarchLibDirs,
1995    SmallVectorImpl<StringRef> &BiarchTripleAliases) {
1996  // Declare a bunch of static data sets that we'll select between below. These
1997  // are specifically designed to always refer to string literals to avoid any
1998  // lifetime or initialization issues.
1999  static const char *const AArch64LibDirs[] = {"/lib64", "/lib"};
2000  static const char *const AArch64Triples[] = {
2001      "aarch64-none-linux-gnu", "aarch64-linux-gnu", "aarch64-redhat-linux",
2002      "aarch64-suse-linux", "aarch64-linux-android"};
2003  static const char *const AArch64beLibDirs[] = {"/lib"};
2004  static const char *const AArch64beTriples[] = {"aarch64_be-none-linux-gnu",
2005                                                 "aarch64_be-linux-gnu"};
2006
2007  static const char *const ARMLibDirs[] = {"/lib"};
2008  static const char *const ARMTriples[] = {"arm-linux-gnueabi",
2009                                           "arm-linux-androideabi"};
2010  static const char *const ARMHFTriples[] = {"arm-linux-gnueabihf",
2011                                             "armv7hl-redhat-linux-gnueabi",
2012                                             "armv6hl-suse-linux-gnueabi",
2013                                             "armv7hl-suse-linux-gnueabi"};
2014  static const char *const ARMebLibDirs[] = {"/lib"};
2015  static const char *const ARMebTriples[] = {"armeb-linux-gnueabi",
2016                                             "armeb-linux-androideabi"};
2017  static const char *const ARMebHFTriples[] = {
2018      "armeb-linux-gnueabihf", "armebv7hl-redhat-linux-gnueabi"};
2019
2020  static const char *const AVRLibDirs[] = {"/lib"};
2021  static const char *const AVRTriples[] = {"avr"};
2022
2023  static const char *const X86_64LibDirs[] = {"/lib64", "/lib"};
2024  static const char *const X86_64Triples[] = {
2025      "x86_64-linux-gnu",       "x86_64-unknown-linux-gnu",
2026      "x86_64-pc-linux-gnu",    "x86_64-redhat-linux6E",
2027      "x86_64-redhat-linux",    "x86_64-suse-linux",
2028      "x86_64-manbo-linux-gnu", "x86_64-linux-gnu",
2029      "x86_64-slackware-linux", "x86_64-unknown-linux",
2030      "x86_64-amazon-linux",    "x86_64-linux-android"};
2031  static const char *const X32LibDirs[] = {"/libx32"};
2032  static const char *const X86LibDirs[] = {"/lib32", "/lib"};
2033  static const char *const X86Triples[] = {
2034      "i686-linux-gnu",       "i686-pc-linux-gnu",     "i486-linux-gnu",
2035      "i386-linux-gnu",       "i386-redhat-linux6E",   "i686-redhat-linux",
2036      "i586-redhat-linux",    "i386-redhat-linux",     "i586-suse-linux",
2037      "i486-slackware-linux", "i686-montavista-linux", "i586-linux-gnu",
2038      "i686-linux-android",   "i386-gnu",              "i486-gnu",
2039      "i586-gnu",             "i686-gnu"};
2040
2041  static const char *const MIPSLibDirs[] = {"/lib"};
2042  static const char *const MIPSTriples[] = {
2043      "mips-linux-gnu", "mips-mti-linux", "mips-mti-linux-gnu",
2044      "mips-img-linux-gnu", "mipsisa32r6-linux-gnu"};
2045  static const char *const MIPSELLibDirs[] = {"/lib"};
2046  static const char *const MIPSELTriples[] = {
2047      "mipsel-linux-gnu", "mips-img-linux-gnu", "mipsisa32r6el-linux-gnu",
2048      "mipsel-linux-android"};
2049
2050  static const char *const MIPS64LibDirs[] = {"/lib64", "/lib"};
2051  static const char *const MIPS64Triples[] = {
2052      "mips64-linux-gnu",      "mips-mti-linux-gnu",
2053      "mips-img-linux-gnu",    "mips64-linux-gnuabi64",
2054      "mipsisa64r6-linux-gnu", "mipsisa64r6-linux-gnuabi64"};
2055  static const char *const MIPS64ELLibDirs[] = {"/lib64", "/lib"};
2056  static const char *const MIPS64ELTriples[] = {
2057      "mips64el-linux-gnu",      "mips-mti-linux-gnu",
2058      "mips-img-linux-gnu",      "mips64el-linux-gnuabi64",
2059      "mipsisa64r6el-linux-gnu", "mipsisa64r6el-linux-gnuabi64",
2060      "mips64el-linux-android"};
2061
2062  static const char *const MIPSN32LibDirs[] = {"/lib32"};
2063  static const char *const MIPSN32Triples[] = {"mips64-linux-gnuabin32",
2064                                               "mipsisa64r6-linux-gnuabin32"};
2065  static const char *const MIPSN32ELLibDirs[] = {"/lib32"};
2066  static const char *const MIPSN32ELTriples[] = {
2067      "mips64el-linux-gnuabin32", "mipsisa64r6el-linux-gnuabin32"};
2068
2069  static const char *const MSP430LibDirs[] = {"/lib"};
2070  static const char *const MSP430Triples[] = {"msp430-elf"};
2071
2072  static const char *const PPCLibDirs[] = {"/lib32", "/lib"};
2073  static const char *const PPCTriples[] = {
2074      "powerpc-linux-gnu", "powerpc-unknown-linux-gnu", "powerpc-linux-gnuspe",
2075      // On 32-bit PowerPC systems running SUSE Linux, gcc is configured as a
2076      // 64-bit compiler which defaults to "-m32", hence "powerpc64-suse-linux".
2077      "powerpc64-suse-linux", "powerpc-montavista-linuxspe"};
2078  static const char *const PPC64LibDirs[] = {"/lib64", "/lib"};
2079  static const char *const PPC64Triples[] = {
2080      "powerpc64-linux-gnu", "powerpc64-unknown-linux-gnu",
2081      "powerpc64-suse-linux", "ppc64-redhat-linux"};
2082  static const char *const PPC64LELibDirs[] = {"/lib64", "/lib"};
2083  static const char *const PPC64LETriples[] = {
2084      "powerpc64le-linux-gnu", "powerpc64le-unknown-linux-gnu",
2085      "powerpc64le-suse-linux", "ppc64le-redhat-linux"};
2086
2087  static const char *const RISCV32LibDirs[] = {"/lib32", "/lib"};
2088  static const char *const RISCV32Triples[] = {"riscv32-unknown-linux-gnu",
2089                                               "riscv32-linux-gnu",
2090                                               "riscv32-unknown-elf"};
2091  static const char *const RISCV64LibDirs[] = {"/lib64", "/lib"};
2092  static const char *const RISCV64Triples[] = {"riscv64-unknown-linux-gnu",
2093                                               "riscv64-linux-gnu",
2094                                               "riscv64-unknown-elf",
2095                                               "riscv64-suse-linux"};
2096
2097  static const char *const SPARCv8LibDirs[] = {"/lib32", "/lib"};
2098  static const char *const SPARCv8Triples[] = {"sparc-linux-gnu",
2099                                               "sparcv8-linux-gnu"};
2100  static const char *const SPARCv9LibDirs[] = {"/lib64", "/lib"};
2101  static const char *const SPARCv9Triples[] = {"sparc64-linux-gnu",
2102                                               "sparcv9-linux-gnu"};
2103
2104  static const char *const SystemZLibDirs[] = {"/lib64", "/lib"};
2105  static const char *const SystemZTriples[] = {
2106      "s390x-linux-gnu", "s390x-unknown-linux-gnu", "s390x-ibm-linux-gnu",
2107      "s390x-suse-linux", "s390x-redhat-linux"};
2108
2109
2110  using std::begin;
2111  using std::end;
2112
2113  if (TargetTriple.getOS() == llvm::Triple::Solaris) {
2114    static const char *const SolarisLibDirs[] = {"/lib"};
2115    static const char *const SolarisSparcV8Triples[] = {
2116        "sparc-sun-solaris2.11", "sparc-sun-solaris2.12"};
2117    static const char *const SolarisSparcV9Triples[] = {
2118        "sparcv9-sun-solaris2.11", "sparcv9-sun-solaris2.12"};
2119    static const char *const SolarisX86Triples[] = {"i386-pc-solaris2.11",
2120                                                    "i386-pc-solaris2.12"};
2121    static const char *const SolarisX86_64Triples[] = {"x86_64-pc-solaris2.11",
2122                                                       "x86_64-pc-solaris2.12"};
2123    LibDirs.append(begin(SolarisLibDirs), end(SolarisLibDirs));
2124    BiarchLibDirs.append(begin(SolarisLibDirs), end(SolarisLibDirs));
2125    switch (TargetTriple.getArch()) {
2126    case llvm::Triple::x86:
2127      TripleAliases.append(begin(SolarisX86Triples), end(SolarisX86Triples));
2128      BiarchTripleAliases.append(begin(SolarisX86_64Triples),
2129                                 end(SolarisX86_64Triples));
2130      break;
2131    case llvm::Triple::x86_64:
2132      TripleAliases.append(begin(SolarisX86_64Triples),
2133                           end(SolarisX86_64Triples));
2134      BiarchTripleAliases.append(begin(SolarisX86Triples),
2135                                 end(SolarisX86Triples));
2136      break;
2137    case llvm::Triple::sparc:
2138      TripleAliases.append(begin(SolarisSparcV8Triples),
2139                           end(SolarisSparcV8Triples));
2140      BiarchTripleAliases.append(begin(SolarisSparcV9Triples),
2141                                 end(SolarisSparcV9Triples));
2142      break;
2143    case llvm::Triple::sparcv9:
2144      TripleAliases.append(begin(SolarisSparcV9Triples),
2145                           end(SolarisSparcV9Triples));
2146      BiarchTripleAliases.append(begin(SolarisSparcV8Triples),
2147                                 end(SolarisSparcV8Triples));
2148      break;
2149    default:
2150      break;
2151    }
2152    return;
2153  }
2154
2155  // Android targets should not use GNU/Linux tools or libraries.
2156  if (TargetTriple.isAndroid()) {
2157    static const char *const AArch64AndroidTriples[] = {
2158        "aarch64-linux-android"};
2159    static const char *const ARMAndroidTriples[] = {"arm-linux-androideabi"};
2160    static const char *const MIPSELAndroidTriples[] = {"mipsel-linux-android"};
2161    static const char *const MIPS64ELAndroidTriples[] = {
2162        "mips64el-linux-android"};
2163    static const char *const X86AndroidTriples[] = {"i686-linux-android"};
2164    static const char *const X86_64AndroidTriples[] = {"x86_64-linux-android"};
2165
2166    switch (TargetTriple.getArch()) {
2167    case llvm::Triple::aarch64:
2168      LibDirs.append(begin(AArch64LibDirs), end(AArch64LibDirs));
2169      TripleAliases.append(begin(AArch64AndroidTriples),
2170                           end(AArch64AndroidTriples));
2171      break;
2172    case llvm::Triple::arm:
2173    case llvm::Triple::thumb:
2174      LibDirs.append(begin(ARMLibDirs), end(ARMLibDirs));
2175      TripleAliases.append(begin(ARMAndroidTriples), end(ARMAndroidTriples));
2176      break;
2177    case llvm::Triple::mipsel:
2178      LibDirs.append(begin(MIPSELLibDirs), end(MIPSELLibDirs));
2179      TripleAliases.append(begin(MIPSELAndroidTriples),
2180                           end(MIPSELAndroidTriples));
2181      BiarchLibDirs.append(begin(MIPS64ELLibDirs), end(MIPS64ELLibDirs));
2182      BiarchTripleAliases.append(begin(MIPS64ELAndroidTriples),
2183                                 end(MIPS64ELAndroidTriples));
2184      break;
2185    case llvm::Triple::mips64el:
2186      LibDirs.append(begin(MIPS64ELLibDirs), end(MIPS64ELLibDirs));
2187      TripleAliases.append(begin(MIPS64ELAndroidTriples),
2188                           end(MIPS64ELAndroidTriples));
2189      BiarchLibDirs.append(begin(MIPSELLibDirs), end(MIPSELLibDirs));
2190      BiarchTripleAliases.append(begin(MIPSELAndroidTriples),
2191                                 end(MIPSELAndroidTriples));
2192      break;
2193    case llvm::Triple::x86_64:
2194      LibDirs.append(begin(X86_64LibDirs), end(X86_64LibDirs));
2195      TripleAliases.append(begin(X86_64AndroidTriples),
2196                           end(X86_64AndroidTriples));
2197      BiarchLibDirs.append(begin(X86LibDirs), end(X86LibDirs));
2198      BiarchTripleAliases.append(begin(X86AndroidTriples),
2199                                 end(X86AndroidTriples));
2200      break;
2201    case llvm::Triple::x86:
2202      LibDirs.append(begin(X86LibDirs), end(X86LibDirs));
2203      TripleAliases.append(begin(X86AndroidTriples), end(X86AndroidTriples));
2204      BiarchLibDirs.append(begin(X86_64LibDirs), end(X86_64LibDirs));
2205      BiarchTripleAliases.append(begin(X86_64AndroidTriples),
2206                                 end(X86_64AndroidTriples));
2207      break;
2208    default:
2209      break;
2210    }
2211
2212    return;
2213  }
2214
2215  switch (TargetTriple.getArch()) {
2216  case llvm::Triple::aarch64:
2217    LibDirs.append(begin(AArch64LibDirs), end(AArch64LibDirs));
2218    TripleAliases.append(begin(AArch64Triples), end(AArch64Triples));
2219    BiarchLibDirs.append(begin(AArch64LibDirs), end(AArch64LibDirs));
2220    BiarchTripleAliases.append(begin(AArch64Triples), end(AArch64Triples));
2221    break;
2222  case llvm::Triple::aarch64_be:
2223    LibDirs.append(begin(AArch64beLibDirs), end(AArch64beLibDirs));
2224    TripleAliases.append(begin(AArch64beTriples), end(AArch64beTriples));
2225    BiarchLibDirs.append(begin(AArch64beLibDirs), end(AArch64beLibDirs));
2226    BiarchTripleAliases.append(begin(AArch64beTriples), end(AArch64beTriples));
2227    break;
2228  case llvm::Triple::arm:
2229  case llvm::Triple::thumb:
2230    LibDirs.append(begin(ARMLibDirs), end(ARMLibDirs));
2231    if (TargetTriple.getEnvironment() == llvm::Triple::GNUEABIHF) {
2232      TripleAliases.append(begin(ARMHFTriples), end(ARMHFTriples));
2233    } else {
2234      TripleAliases.append(begin(ARMTriples), end(ARMTriples));
2235    }
2236    break;
2237  case llvm::Triple::armeb:
2238  case llvm::Triple::thumbeb:
2239    LibDirs.append(begin(ARMebLibDirs), end(ARMebLibDirs));
2240    if (TargetTriple.getEnvironment() == llvm::Triple::GNUEABIHF) {
2241      TripleAliases.append(begin(ARMebHFTriples), end(ARMebHFTriples));
2242    } else {
2243      TripleAliases.append(begin(ARMebTriples), end(ARMebTriples));
2244    }
2245    break;
2246  case llvm::Triple::avr:
2247    LibDirs.append(begin(AVRLibDirs), end(AVRLibDirs));
2248    TripleAliases.append(begin(AVRTriples), end(AVRTriples));
2249    break;
2250  case llvm::Triple::x86_64:
2251    LibDirs.append(begin(X86_64LibDirs), end(X86_64LibDirs));
2252    TripleAliases.append(begin(X86_64Triples), end(X86_64Triples));
2253    // x32 is always available when x86_64 is available, so adding it as
2254    // secondary arch with x86_64 triples
2255    if (TargetTriple.getEnvironment() == llvm::Triple::GNUX32) {
2256      BiarchLibDirs.append(begin(X32LibDirs), end(X32LibDirs));
2257      BiarchTripleAliases.append(begin(X86_64Triples), end(X86_64Triples));
2258    } else {
2259      BiarchLibDirs.append(begin(X86LibDirs), end(X86LibDirs));
2260      BiarchTripleAliases.append(begin(X86Triples), end(X86Triples));
2261    }
2262    break;
2263  case llvm::Triple::x86:
2264    LibDirs.append(begin(X86LibDirs), end(X86LibDirs));
2265    // MCU toolchain is 32 bit only and its triple alias is TargetTriple
2266    // itself, which will be appended below.
2267    if (!TargetTriple.isOSIAMCU()) {
2268      TripleAliases.append(begin(X86Triples), end(X86Triples));
2269      BiarchLibDirs.append(begin(X86_64LibDirs), end(X86_64LibDirs));
2270      BiarchTripleAliases.append(begin(X86_64Triples), end(X86_64Triples));
2271    }
2272    break;
2273  case llvm::Triple::mips:
2274    LibDirs.append(begin(MIPSLibDirs), end(MIPSLibDirs));
2275    TripleAliases.append(begin(MIPSTriples), end(MIPSTriples));
2276    BiarchLibDirs.append(begin(MIPS64LibDirs), end(MIPS64LibDirs));
2277    BiarchTripleAliases.append(begin(MIPS64Triples), end(MIPS64Triples));
2278    BiarchLibDirs.append(begin(MIPSN32LibDirs), end(MIPSN32LibDirs));
2279    BiarchTripleAliases.append(begin(MIPSN32Triples), end(MIPSN32Triples));
2280    break;
2281  case llvm::Triple::mipsel:
2282    LibDirs.append(begin(MIPSELLibDirs), end(MIPSELLibDirs));
2283    TripleAliases.append(begin(MIPSELTriples), end(MIPSELTriples));
2284    TripleAliases.append(begin(MIPSTriples), end(MIPSTriples));
2285    BiarchLibDirs.append(begin(MIPS64ELLibDirs), end(MIPS64ELLibDirs));
2286    BiarchTripleAliases.append(begin(MIPS64ELTriples), end(MIPS64ELTriples));
2287    BiarchLibDirs.append(begin(MIPSN32ELLibDirs), end(MIPSN32ELLibDirs));
2288    BiarchTripleAliases.append(begin(MIPSN32ELTriples), end(MIPSN32ELTriples));
2289    break;
2290  case llvm::Triple::mips64:
2291    LibDirs.append(begin(MIPS64LibDirs), end(MIPS64LibDirs));
2292    TripleAliases.append(begin(MIPS64Triples), end(MIPS64Triples));
2293    BiarchLibDirs.append(begin(MIPSLibDirs), end(MIPSLibDirs));
2294    BiarchTripleAliases.append(begin(MIPSTriples), end(MIPSTriples));
2295    BiarchLibDirs.append(begin(MIPSN32LibDirs), end(MIPSN32LibDirs));
2296    BiarchTripleAliases.append(begin(MIPSN32Triples), end(MIPSN32Triples));
2297    break;
2298  case llvm::Triple::mips64el:
2299    LibDirs.append(begin(MIPS64ELLibDirs), end(MIPS64ELLibDirs));
2300    TripleAliases.append(begin(MIPS64ELTriples), end(MIPS64ELTriples));
2301    BiarchLibDirs.append(begin(MIPSELLibDirs), end(MIPSELLibDirs));
2302    BiarchTripleAliases.append(begin(MIPSELTriples), end(MIPSELTriples));
2303    BiarchLibDirs.append(begin(MIPSN32ELLibDirs), end(MIPSN32ELLibDirs));
2304    BiarchTripleAliases.append(begin(MIPSN32ELTriples), end(MIPSN32ELTriples));
2305    BiarchTripleAliases.append(begin(MIPSTriples), end(MIPSTriples));
2306    break;
2307  case llvm::Triple::msp430:
2308    LibDirs.append(begin(MSP430LibDirs), end(MSP430LibDirs));
2309    TripleAliases.append(begin(MSP430Triples), end(MSP430Triples));
2310    break;
2311  case llvm::Triple::ppc:
2312    LibDirs.append(begin(PPCLibDirs), end(PPCLibDirs));
2313    TripleAliases.append(begin(PPCTriples), end(PPCTriples));
2314    BiarchLibDirs.append(begin(PPC64LibDirs), end(PPC64LibDirs));
2315    BiarchTripleAliases.append(begin(PPC64Triples), end(PPC64Triples));
2316    break;
2317  case llvm::Triple::ppc64:
2318    LibDirs.append(begin(PPC64LibDirs), end(PPC64LibDirs));
2319    TripleAliases.append(begin(PPC64Triples), end(PPC64Triples));
2320    BiarchLibDirs.append(begin(PPCLibDirs), end(PPCLibDirs));
2321    BiarchTripleAliases.append(begin(PPCTriples), end(PPCTriples));
2322    break;
2323  case llvm::Triple::ppc64le:
2324    LibDirs.append(begin(PPC64LELibDirs), end(PPC64LELibDirs));
2325    TripleAliases.append(begin(PPC64LETriples), end(PPC64LETriples));
2326    break;
2327  case llvm::Triple::riscv32:
2328    LibDirs.append(begin(RISCV32LibDirs), end(RISCV32LibDirs));
2329    TripleAliases.append(begin(RISCV32Triples), end(RISCV32Triples));
2330    BiarchLibDirs.append(begin(RISCV64LibDirs), end(RISCV64LibDirs));
2331    BiarchTripleAliases.append(begin(RISCV64Triples), end(RISCV64Triples));
2332    break;
2333  case llvm::Triple::riscv64:
2334    LibDirs.append(begin(RISCV64LibDirs), end(RISCV64LibDirs));
2335    TripleAliases.append(begin(RISCV64Triples), end(RISCV64Triples));
2336    BiarchLibDirs.append(begin(RISCV32LibDirs), end(RISCV32LibDirs));
2337    BiarchTripleAliases.append(begin(RISCV32Triples), end(RISCV32Triples));
2338    break;
2339  case llvm::Triple::sparc:
2340  case llvm::Triple::sparcel:
2341    LibDirs.append(begin(SPARCv8LibDirs), end(SPARCv8LibDirs));
2342    TripleAliases.append(begin(SPARCv8Triples), end(SPARCv8Triples));
2343    BiarchLibDirs.append(begin(SPARCv9LibDirs), end(SPARCv9LibDirs));
2344    BiarchTripleAliases.append(begin(SPARCv9Triples), end(SPARCv9Triples));
2345    break;
2346  case llvm::Triple::sparcv9:
2347    LibDirs.append(begin(SPARCv9LibDirs), end(SPARCv9LibDirs));
2348    TripleAliases.append(begin(SPARCv9Triples), end(SPARCv9Triples));
2349    BiarchLibDirs.append(begin(SPARCv8LibDirs), end(SPARCv8LibDirs));
2350    BiarchTripleAliases.append(begin(SPARCv8Triples), end(SPARCv8Triples));
2351    break;
2352  case llvm::Triple::systemz:
2353    LibDirs.append(begin(SystemZLibDirs), end(SystemZLibDirs));
2354    TripleAliases.append(begin(SystemZTriples), end(SystemZTriples));
2355    break;
2356  default:
2357    // By default, just rely on the standard lib directories and the original
2358    // triple.
2359    break;
2360  }
2361
2362  // Always append the drivers target triple to the end, in case it doesn't
2363  // match any of our aliases.
2364  TripleAliases.push_back(TargetTriple.str());
2365
2366  // Also include the multiarch variant if it's different.
2367  if (TargetTriple.str() != BiarchTriple.str())
2368    BiarchTripleAliases.push_back(BiarchTriple.str());
2369}
2370
2371bool Generic_GCC::GCCInstallationDetector::ScanGCCForMultilibs(
2372    const llvm::Triple &TargetTriple, const ArgList &Args,
2373    StringRef Path, bool NeedsBiarchSuffix) {
2374  llvm::Triple::ArchType TargetArch = TargetTriple.getArch();
2375  DetectedMultilibs Detected;
2376
2377  // Android standalone toolchain could have multilibs for ARM and Thumb.
2378  // Debian mips multilibs behave more like the rest of the biarch ones,
2379  // so handle them there
2380  if (isArmOrThumbArch(TargetArch) && TargetTriple.isAndroid()) {
2381    // It should also work without multilibs in a simplified toolchain.
2382    findAndroidArmMultilibs(D, TargetTriple, Path, Args, Detected);
2383  } else if (TargetTriple.isMIPS()) {
2384    if (!findMIPSMultilibs(D, TargetTriple, Path, Args, Detected))
2385      return false;
2386  } else if (TargetTriple.isRISCV()) {
2387    findRISCVMultilibs(D, TargetTriple, Path, Args, Detected);
2388  } else if (isMSP430(TargetArch)) {
2389    findMSP430Multilibs(D, TargetTriple, Path, Args, Detected);
2390  } else if (TargetArch == llvm::Triple::avr) {
2391    // AVR has no multilibs.
2392  } else if (!findBiarchMultilibs(D, TargetTriple, Path, Args,
2393                                  NeedsBiarchSuffix, Detected)) {
2394    return false;
2395  }
2396
2397  Multilibs = Detected.Multilibs;
2398  SelectedMultilib = Detected.SelectedMultilib;
2399  BiarchSibling = Detected.BiarchSibling;
2400
2401  return true;
2402}
2403
2404void Generic_GCC::GCCInstallationDetector::ScanLibDirForGCCTriple(
2405    const llvm::Triple &TargetTriple, const ArgList &Args,
2406    const std::string &LibDir, StringRef CandidateTriple,
2407    bool NeedsBiarchSuffix) {
2408  llvm::Triple::ArchType TargetArch = TargetTriple.getArch();
2409  // Locations relative to the system lib directory where GCC's triple-specific
2410  // directories might reside.
2411  struct GCCLibSuffix {
2412    // Path from system lib directory to GCC triple-specific directory.
2413    std::string LibSuffix;
2414    // Path from GCC triple-specific directory back to system lib directory.
2415    // This is one '..' component per component in LibSuffix.
2416    StringRef ReversePath;
2417    // Whether this library suffix is relevant for the triple.
2418    bool Active;
2419  } Suffixes[] = {
2420      // This is the normal place.
2421      {"gcc/" + CandidateTriple.str(), "../..", true},
2422
2423      // Debian puts cross-compilers in gcc-cross.
2424      {"gcc-cross/" + CandidateTriple.str(), "../..",
2425       TargetTriple.getOS() != llvm::Triple::Solaris},
2426
2427      // The Freescale PPC SDK has the gcc libraries in
2428      // <sysroot>/usr/lib/<triple>/x.y.z so have a look there as well. Only do
2429      // this on Freescale triples, though, since some systems put a *lot* of
2430      // files in that location, not just GCC installation data.
2431      {CandidateTriple.str(), "..",
2432       TargetTriple.getVendor() == llvm::Triple::Freescale ||
2433       TargetTriple.getVendor() == llvm::Triple::OpenEmbedded},
2434
2435      // Natively multiarch systems sometimes put the GCC triple-specific
2436      // directory within their multiarch lib directory, resulting in the
2437      // triple appearing twice.
2438      {CandidateTriple.str() + "/gcc/" + CandidateTriple.str(), "../../..",
2439       TargetTriple.getOS() != llvm::Triple::Solaris},
2440
2441      // Deal with cases (on Ubuntu) where the system architecture could be i386
2442      // but the GCC target architecture could be (say) i686.
2443      // FIXME: It may be worthwhile to generalize this and look for a second
2444      // triple.
2445      {"i386-linux-gnu/gcc/" + CandidateTriple.str(), "../../..",
2446       (TargetArch == llvm::Triple::x86 &&
2447        TargetTriple.getOS() != llvm::Triple::Solaris)},
2448      {"i386-gnu/gcc/" + CandidateTriple.str(), "../../..",
2449       (TargetArch == llvm::Triple::x86 &&
2450        TargetTriple.getOS() != llvm::Triple::Solaris)}};
2451
2452  for (auto &Suffix : Suffixes) {
2453    if (!Suffix.Active)
2454      continue;
2455
2456    StringRef LibSuffix = Suffix.LibSuffix;
2457    std::error_code EC;
2458    for (llvm::vfs::directory_iterator
2459             LI = D.getVFS().dir_begin(LibDir + "/" + LibSuffix, EC),
2460             LE;
2461         !EC && LI != LE; LI = LI.increment(EC)) {
2462      StringRef VersionText = llvm::sys::path::filename(LI->path());
2463      GCCVersion CandidateVersion = GCCVersion::Parse(VersionText);
2464      if (CandidateVersion.Major != -1) // Filter obviously bad entries.
2465        if (!CandidateGCCInstallPaths.insert(LI->path()).second)
2466          continue; // Saw this path before; no need to look at it again.
2467      if (CandidateVersion.isOlderThan(4, 1, 1))
2468        continue;
2469      if (CandidateVersion <= Version)
2470        continue;
2471
2472      if (!ScanGCCForMultilibs(TargetTriple, Args, LI->path(),
2473                               NeedsBiarchSuffix))
2474        continue;
2475
2476      Version = CandidateVersion;
2477      GCCTriple.setTriple(CandidateTriple);
2478      // FIXME: We hack together the directory name here instead of
2479      // using LI to ensure stable path separators across Windows and
2480      // Linux.
2481      GCCInstallPath = (LibDir + "/" + LibSuffix + "/" + VersionText).str();
2482      GCCParentLibPath = (GCCInstallPath + "/../" + Suffix.ReversePath).str();
2483      IsValid = true;
2484    }
2485  }
2486}
2487
2488bool Generic_GCC::GCCInstallationDetector::ScanGentooConfigs(
2489    const llvm::Triple &TargetTriple, const ArgList &Args,
2490    const SmallVectorImpl<StringRef> &CandidateTriples,
2491    const SmallVectorImpl<StringRef> &CandidateBiarchTriples) {
2492  for (StringRef CandidateTriple : CandidateTriples) {
2493    if (ScanGentooGccConfig(TargetTriple, Args, CandidateTriple))
2494      return true;
2495  }
2496
2497  for (StringRef CandidateTriple : CandidateBiarchTriples) {
2498    if (ScanGentooGccConfig(TargetTriple, Args, CandidateTriple, true))
2499      return true;
2500  }
2501  return false;
2502}
2503
2504bool Generic_GCC::GCCInstallationDetector::ScanGentooGccConfig(
2505    const llvm::Triple &TargetTriple, const ArgList &Args,
2506    StringRef CandidateTriple, bool NeedsBiarchSuffix) {
2507  llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> File =
2508      D.getVFS().getBufferForFile(D.SysRoot + "/etc/env.d/gcc/config-" +
2509                                  CandidateTriple.str());
2510  if (File) {
2511    SmallVector<StringRef, 2> Lines;
2512    File.get()->getBuffer().split(Lines, "\n");
2513    for (StringRef Line : Lines) {
2514      Line = Line.trim();
2515      // CURRENT=triple-version
2516      if (!Line.consume_front("CURRENT="))
2517        continue;
2518      // Process the config file pointed to by CURRENT.
2519      llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> ConfigFile =
2520          D.getVFS().getBufferForFile(D.SysRoot + "/etc/env.d/gcc/" +
2521                                      Line.str());
2522      std::pair<StringRef, StringRef> ActiveVersion = Line.rsplit('-');
2523      // List of paths to scan for libraries.
2524      SmallVector<StringRef, 4> GentooScanPaths;
2525      // Scan the Config file to find installed GCC libraries path.
2526      // Typical content of the GCC config file:
2527      // LDPATH="/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.x:/usr/lib/gcc/
2528      // (continued from previous line) x86_64-pc-linux-gnu/4.9.x/32"
2529      // MANPATH="/usr/share/gcc-data/x86_64-pc-linux-gnu/4.9.x/man"
2530      // INFOPATH="/usr/share/gcc-data/x86_64-pc-linux-gnu/4.9.x/info"
2531      // STDCXX_INCDIR="/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.x/include/g++-v4"
2532      // We are looking for the paths listed in LDPATH=... .
2533      if (ConfigFile) {
2534        SmallVector<StringRef, 2> ConfigLines;
2535        ConfigFile.get()->getBuffer().split(ConfigLines, "\n");
2536        for (StringRef ConfLine : ConfigLines) {
2537          ConfLine = ConfLine.trim();
2538          if (ConfLine.consume_front("LDPATH=")) {
2539            // Drop '"' from front and back if present.
2540            ConfLine.consume_back("\"");
2541            ConfLine.consume_front("\"");
2542            // Get all paths sperated by ':'
2543            ConfLine.split(GentooScanPaths, ':', -1, /*AllowEmpty*/ false);
2544          }
2545        }
2546      }
2547      // Test the path based on the version in /etc/env.d/gcc/config-{tuple}.
2548      std::string basePath = "/usr/lib/gcc/" + ActiveVersion.first.str() + "/"
2549          + ActiveVersion.second.str();
2550      GentooScanPaths.push_back(StringRef(basePath));
2551
2552      // Scan all paths for GCC libraries.
2553      for (const auto &GentooScanPath : GentooScanPaths) {
2554        std::string GentooPath = D.SysRoot + std::string(GentooScanPath);
2555        if (D.getVFS().exists(GentooPath + "/crtbegin.o")) {
2556          if (!ScanGCCForMultilibs(TargetTriple, Args, GentooPath,
2557                                   NeedsBiarchSuffix))
2558            continue;
2559
2560          Version = GCCVersion::Parse(ActiveVersion.second);
2561          GCCInstallPath = GentooPath;
2562          GCCParentLibPath = GentooPath + std::string("/../../..");
2563          GCCTriple.setTriple(ActiveVersion.first);
2564          IsValid = true;
2565          return true;
2566        }
2567      }
2568    }
2569  }
2570
2571  return false;
2572}
2573
2574Generic_GCC::Generic_GCC(const Driver &D, const llvm::Triple &Triple,
2575                         const ArgList &Args)
2576    : ToolChain(D, Triple, Args), GCCInstallation(D),
2577      CudaInstallation(D, Triple, Args) {
2578  getProgramPaths().push_back(getDriver().getInstalledDir());
2579  if (getDriver().getInstalledDir() != getDriver().Dir)
2580    getProgramPaths().push_back(getDriver().Dir);
2581}
2582
2583Generic_GCC::~Generic_GCC() {}
2584
2585Tool *Generic_GCC::getTool(Action::ActionClass AC) const {
2586  switch (AC) {
2587  case Action::PreprocessJobClass:
2588    if (!Preprocess)
2589      Preprocess.reset(new clang::driver::tools::gcc::Preprocessor(*this));
2590    return Preprocess.get();
2591  case Action::CompileJobClass:
2592    if (!Compile)
2593      Compile.reset(new tools::gcc::Compiler(*this));
2594    return Compile.get();
2595  default:
2596    return ToolChain::getTool(AC);
2597  }
2598}
2599
2600Tool *Generic_GCC::buildAssembler() const {
2601  return new tools::gnutools::Assembler(*this);
2602}
2603
2604Tool *Generic_GCC::buildLinker() const { return new tools::gcc::Linker(*this); }
2605
2606void Generic_GCC::printVerboseInfo(raw_ostream &OS) const {
2607  // Print the information about how we detected the GCC installation.
2608  GCCInstallation.print(OS);
2609  CudaInstallation.print(OS);
2610}
2611
2612bool Generic_GCC::IsUnwindTablesDefault(const ArgList &Args) const {
2613  return getArch() == llvm::Triple::x86_64;
2614}
2615
2616bool Generic_GCC::isPICDefault() const {
2617  switch (getArch()) {
2618  case llvm::Triple::x86_64:
2619    return getTriple().isOSWindows();
2620  case llvm::Triple::mips64:
2621  case llvm::Triple::mips64el:
2622    return true;
2623  default:
2624    return false;
2625  }
2626}
2627
2628bool Generic_GCC::isPIEDefault() const { return false; }
2629
2630bool Generic_GCC::isPICDefaultForced() const {
2631  return getArch() == llvm::Triple::x86_64 && getTriple().isOSWindows();
2632}
2633
2634bool Generic_GCC::IsIntegratedAssemblerDefault() const {
2635  switch (getTriple().getArch()) {
2636  case llvm::Triple::x86:
2637  case llvm::Triple::x86_64:
2638  case llvm::Triple::aarch64:
2639  case llvm::Triple::aarch64_be:
2640  case llvm::Triple::arm:
2641  case llvm::Triple::armeb:
2642  case llvm::Triple::avr:
2643  case llvm::Triple::bpfel:
2644  case llvm::Triple::bpfeb:
2645  case llvm::Triple::thumb:
2646  case llvm::Triple::thumbeb:
2647  case llvm::Triple::ppc:
2648  case llvm::Triple::ppc64:
2649  case llvm::Triple::ppc64le:
2650  case llvm::Triple::riscv32:
2651  case llvm::Triple::riscv64:
2652  case llvm::Triple::systemz:
2653  case llvm::Triple::mips:
2654  case llvm::Triple::mipsel:
2655  case llvm::Triple::mips64:
2656  case llvm::Triple::mips64el:
2657  case llvm::Triple::msp430:
2658    return true;
2659  case llvm::Triple::sparc:
2660  case llvm::Triple::sparcel:
2661  case llvm::Triple::sparcv9:
2662    if (getTriple().isOSFreeBSD() || getTriple().isOSOpenBSD() ||
2663        getTriple().isOSSolaris())
2664      return true;
2665    return false;
2666  default:
2667    return false;
2668  }
2669}
2670
2671void Generic_GCC::AddClangCXXStdlibIncludeArgs(const ArgList &DriverArgs,
2672                                               ArgStringList &CC1Args) const {
2673  if (DriverArgs.hasArg(options::OPT_nostdlibinc) ||
2674      DriverArgs.hasArg(options::OPT_nostdincxx))
2675    return;
2676
2677  switch (GetCXXStdlibType(DriverArgs)) {
2678  case ToolChain::CST_Libcxx:
2679    addLibCxxIncludePaths(DriverArgs, CC1Args);
2680    break;
2681
2682  case ToolChain::CST_Libstdcxx:
2683    addLibStdCxxIncludePaths(DriverArgs, CC1Args);
2684    break;
2685  }
2686}
2687
2688static std::string DetectLibcxxIncludePath(llvm::vfs::FileSystem &vfs,
2689                                           StringRef base) {
2690  std::error_code EC;
2691  int MaxVersion = 0;
2692  std::string MaxVersionString;
2693  for (llvm::vfs::directory_iterator LI = vfs.dir_begin(base, EC), LE;
2694       !EC && LI != LE; LI = LI.increment(EC)) {
2695    StringRef VersionText = llvm::sys::path::filename(LI->path());
2696    int Version;
2697    if (VersionText[0] == 'v' &&
2698        !VersionText.slice(1, StringRef::npos).getAsInteger(10, Version)) {
2699      if (Version > MaxVersion) {
2700        MaxVersion = Version;
2701        MaxVersionString = VersionText;
2702      }
2703    }
2704  }
2705  return MaxVersion ? (base + "/" + MaxVersionString).str() : "";
2706}
2707
2708void
2709Generic_GCC::addLibCxxIncludePaths(const llvm::opt::ArgList &DriverArgs,
2710                                   llvm::opt::ArgStringList &CC1Args) const {
2711  const std::string& SysRoot = getDriver().SysRoot;
2712  auto AddIncludePath = [&](std::string Path) {
2713    std::string IncludePath = DetectLibcxxIncludePath(getVFS(), Path);
2714    if (IncludePath.empty() || !getVFS().exists(IncludePath))
2715      return false;
2716    addSystemInclude(DriverArgs, CC1Args, IncludePath);
2717    return true;
2718  };
2719  // Android never uses the libc++ headers installed alongside the toolchain,
2720  // which are generally incompatible with the NDK libraries anyway.
2721  if (!getTriple().isAndroid())
2722    if (AddIncludePath(getDriver().Dir + "/../include/c++"))
2723      return;
2724  // If this is a development, non-installed, clang, libcxx will
2725  // not be found at ../include/c++ but it likely to be found at
2726  // one of the following two locations:
2727  if (AddIncludePath(SysRoot + "/usr/local/include/c++"))
2728    return;
2729  if (AddIncludePath(SysRoot + "/usr/include/c++"))
2730    return;
2731}
2732
2733/// Helper to add the variant paths of a libstdc++ installation.
2734bool Generic_GCC::addLibStdCXXIncludePaths(
2735    Twine Base, Twine Suffix, StringRef GCCTriple, StringRef GCCMultiarchTriple,
2736    StringRef TargetMultiarchTriple, Twine IncludeSuffix,
2737    const ArgList &DriverArgs, ArgStringList &CC1Args) const {
2738  if (!getVFS().exists(Base + Suffix))
2739    return false;
2740
2741  addSystemInclude(DriverArgs, CC1Args, Base + Suffix);
2742
2743  // The vanilla GCC layout of libstdc++ headers uses a triple subdirectory. If
2744  // that path exists or we have neither a GCC nor target multiarch triple, use
2745  // this vanilla search path.
2746  if ((GCCMultiarchTriple.empty() && TargetMultiarchTriple.empty()) ||
2747      getVFS().exists(Base + Suffix + "/" + GCCTriple + IncludeSuffix)) {
2748    addSystemInclude(DriverArgs, CC1Args,
2749                     Base + Suffix + "/" + GCCTriple + IncludeSuffix);
2750  } else {
2751    // Otherwise try to use multiarch naming schemes which have normalized the
2752    // triples and put the triple before the suffix.
2753    //
2754    // GCC surprisingly uses *both* the GCC triple with a multilib suffix and
2755    // the target triple, so we support that here.
2756    addSystemInclude(DriverArgs, CC1Args,
2757                     Base + "/" + GCCMultiarchTriple + Suffix + IncludeSuffix);
2758    addSystemInclude(DriverArgs, CC1Args,
2759                     Base + "/" + TargetMultiarchTriple + Suffix);
2760  }
2761
2762  addSystemInclude(DriverArgs, CC1Args, Base + Suffix + "/backward");
2763  return true;
2764}
2765
2766bool
2767Generic_GCC::addGCCLibStdCxxIncludePaths(const llvm::opt::ArgList &DriverArgs,
2768                                         llvm::opt::ArgStringList &CC1Args) const {
2769  // Use GCCInstallation to know where libstdc++ headers are installed.
2770  if (!GCCInstallation.isValid())
2771    return false;
2772
2773  // By default, look for the C++ headers in an include directory adjacent to
2774  // the lib directory of the GCC installation. Note that this is expect to be
2775  // equivalent to '/usr/include/c++/X.Y' in almost all cases.
2776  StringRef LibDir = GCCInstallation.getParentLibPath();
2777  StringRef InstallDir = GCCInstallation.getInstallPath();
2778  StringRef TripleStr = GCCInstallation.getTriple().str();
2779  const Multilib &Multilib = GCCInstallation.getMultilib();
2780  const std::string GCCMultiarchTriple = getMultiarchTriple(
2781      getDriver(), GCCInstallation.getTriple(), getDriver().SysRoot);
2782  const std::string TargetMultiarchTriple =
2783      getMultiarchTriple(getDriver(), getTriple(), getDriver().SysRoot);
2784  const GCCVersion &Version = GCCInstallation.getVersion();
2785
2786  // The primary search for libstdc++ supports multiarch variants.
2787  if (addLibStdCXXIncludePaths(LibDir.str() + "/../include",
2788                               "/c++/" + Version.Text, TripleStr,
2789                               GCCMultiarchTriple, TargetMultiarchTriple,
2790                               Multilib.includeSuffix(), DriverArgs, CC1Args))
2791    return true;
2792
2793  // Otherwise, fall back on a bunch of options which don't use multiarch
2794  // layouts for simplicity.
2795  const std::string LibStdCXXIncludePathCandidates[] = {
2796      // Gentoo is weird and places its headers inside the GCC install,
2797      // so if the first attempt to find the headers fails, try these patterns.
2798      InstallDir.str() + "/include/g++-v" + Version.Text,
2799      InstallDir.str() + "/include/g++-v" + Version.MajorStr + "." +
2800          Version.MinorStr,
2801      InstallDir.str() + "/include/g++-v" + Version.MajorStr,
2802  };
2803
2804  for (const auto &IncludePath : LibStdCXXIncludePathCandidates) {
2805    if (addLibStdCXXIncludePaths(IncludePath, /*Suffix*/ "", TripleStr,
2806                                 /*GCCMultiarchTriple*/ "",
2807                                 /*TargetMultiarchTriple*/ "",
2808                                 Multilib.includeSuffix(), DriverArgs, CC1Args))
2809      return true;
2810  }
2811  return false;
2812}
2813
2814void
2815Generic_GCC::addLibStdCxxIncludePaths(const llvm::opt::ArgList &DriverArgs,
2816                                      llvm::opt::ArgStringList &CC1Args) const {
2817  addGCCLibStdCxxIncludePaths(DriverArgs, CC1Args);
2818}
2819
2820llvm::opt::DerivedArgList *
2821Generic_GCC::TranslateArgs(const llvm::opt::DerivedArgList &Args, StringRef,
2822                           Action::OffloadKind DeviceOffloadKind) const {
2823
2824  // If this tool chain is used for an OpenMP offloading device we have to make
2825  // sure we always generate a shared library regardless of the commands the
2826  // user passed to the host. This is required because the runtime library
2827  // is required to load the device image dynamically at run time.
2828  if (DeviceOffloadKind == Action::OFK_OpenMP) {
2829    DerivedArgList *DAL = new DerivedArgList(Args.getBaseArgs());
2830    const OptTable &Opts = getDriver().getOpts();
2831
2832    // Request the shared library. Given that these options are decided
2833    // implicitly, they do not refer to any base argument.
2834    DAL->AddFlagArg(/*BaseArg=*/nullptr, Opts.getOption(options::OPT_shared));
2835    DAL->AddFlagArg(/*BaseArg=*/nullptr, Opts.getOption(options::OPT_fPIC));
2836
2837    // Filter all the arguments we don't care passing to the offloading
2838    // toolchain as they can mess up with the creation of a shared library.
2839    for (auto *A : Args) {
2840      switch ((options::ID)A->getOption().getID()) {
2841      default:
2842        DAL->append(A);
2843        break;
2844      case options::OPT_shared:
2845      case options::OPT_dynamic:
2846      case options::OPT_static:
2847      case options::OPT_fPIC:
2848      case options::OPT_fno_PIC:
2849      case options::OPT_fpic:
2850      case options::OPT_fno_pic:
2851      case options::OPT_fPIE:
2852      case options::OPT_fno_PIE:
2853      case options::OPT_fpie:
2854      case options::OPT_fno_pie:
2855        break;
2856      }
2857    }
2858    return DAL;
2859  }
2860  return nullptr;
2861}
2862
2863void Generic_ELF::anchor() {}
2864
2865void Generic_ELF::addClangTargetOptions(const ArgList &DriverArgs,
2866                                        ArgStringList &CC1Args,
2867                                        Action::OffloadKind) const {
2868  if (!DriverArgs.hasFlag(options::OPT_fuse_init_array,
2869                          options::OPT_fno_use_init_array, true))
2870    CC1Args.push_back("-fno-use-init-array");
2871}
2872