Gnu.cpp revision 360784 
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 toolchains::Linux &ToolChain) {
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 ToolChain.isPIEDefault();
321  return A->getOption().matches(options::OPT_pie);
322}
323
324static bool getStaticPIE(const ArgList &Args,
325                         const toolchains::Linux &ToolChain) {
326  bool HasStaticPIE = Args.hasArg(options::OPT_static_pie);
327  // -no-pie is an alias for -nopie. So, handling -nopie takes care of
328  // -no-pie as well.
329  if (HasStaticPIE && Args.hasArg(options::OPT_nopie)) {
330    const Driver &D = ToolChain.getDriver();
331    const llvm::opt::OptTable &Opts = D.getOpts();
332    const char *StaticPIEName = Opts.getOptionName(options::OPT_static_pie);
333    const char *NoPIEName = Opts.getOptionName(options::OPT_nopie);
334    D.Diag(diag::err_drv_cannot_mix_options) << StaticPIEName << NoPIEName;
335  }
336  return HasStaticPIE;
337}
338
339static bool getStatic(const ArgList &Args) {
340  return Args.hasArg(options::OPT_static) &&
341      !Args.hasArg(options::OPT_static_pie);
342}
343
344void tools::gnutools::Linker::ConstructJob(Compilation &C, const JobAction &JA,
345                                           const InputInfo &Output,
346                                           const InputInfoList &Inputs,
347                                           const ArgList &Args,
348                                           const char *LinkingOutput) const {
349  const toolchains::Linux &ToolChain =
350      static_cast<const toolchains::Linux &>(getToolChain());
351  const Driver &D = ToolChain.getDriver();
352
353  const llvm::Triple &Triple = getToolChain().getEffectiveTriple();
354
355  const llvm::Triple::ArchType Arch = ToolChain.getArch();
356  const bool isAndroid = ToolChain.getTriple().isAndroid();
357  const bool IsIAMCU = ToolChain.getTriple().isOSIAMCU();
358  const bool IsPIE = getPIE(Args, ToolChain);
359  const bool IsStaticPIE = getStaticPIE(Args, ToolChain);
360  const bool IsStatic = getStatic(Args);
361  const bool HasCRTBeginEndFiles =
362      ToolChain.getTriple().hasEnvironment() ||
363      (ToolChain.getTriple().getVendor() != llvm::Triple::MipsTechnologies);
364
365  ArgStringList CmdArgs;
366
367  // Silence warning for "clang -g foo.o -o foo"
368  Args.ClaimAllArgs(options::OPT_g_Group);
369  // and "clang -emit-llvm foo.o -o foo"
370  Args.ClaimAllArgs(options::OPT_emit_llvm);
371  // and for "clang -w foo.o -o foo". Other warning options are already
372  // handled somewhere else.
373  Args.ClaimAllArgs(options::OPT_w);
374
375  if (!D.SysRoot.empty())
376    CmdArgs.push_back(Args.MakeArgString("--sysroot=" + D.SysRoot));
377
378  if (IsPIE)
379    CmdArgs.push_back("-pie");
380
381  if (IsStaticPIE) {
382    CmdArgs.push_back("-static");
383    CmdArgs.push_back("-pie");
384    CmdArgs.push_back("--no-dynamic-linker");
385    CmdArgs.push_back("-z");
386    CmdArgs.push_back("text");
387  }
388
389  if (ToolChain.isNoExecStackDefault()) {
390    CmdArgs.push_back("-z");
391    CmdArgs.push_back("noexecstack");
392  }
393
394  if (Args.hasArg(options::OPT_rdynamic))
395    CmdArgs.push_back("-export-dynamic");
396
397  if (Args.hasArg(options::OPT_s))
398    CmdArgs.push_back("-s");
399
400  if (Triple.isARM() || Triple.isThumb() || Triple.isAArch64()) {
401    bool IsBigEndian = isArmBigEndian(Triple, Args);
402    if (IsBigEndian)
403      arm::appendBE8LinkFlag(Args, CmdArgs, Triple);
404    IsBigEndian = IsBigEndian || Arch == llvm::Triple::aarch64_be;
405    CmdArgs.push_back(IsBigEndian ? "-EB" : "-EL");
406  }
407
408  // Most Android ARM64 targets should enable the linker fix for erratum
409  // 843419. Only non-Cortex-A53 devices are allowed to skip this flag.
410  if (Arch == llvm::Triple::aarch64 && isAndroid) {
411    std::string CPU = getCPUName(Args, Triple);
412    if (CPU.empty() || CPU == "generic" || CPU == "cortex-a53")
413      CmdArgs.push_back("--fix-cortex-a53-843419");
414  }
415
416  // Android does not allow shared text relocations. Emit a warning if the
417  // user's code contains any.
418  if (isAndroid)
419      CmdArgs.push_back("--warn-shared-textrel");
420
421  for (const auto &Opt : ToolChain.ExtraOpts)
422    CmdArgs.push_back(Opt.c_str());
423
424  CmdArgs.push_back("--eh-frame-hdr");
425
426  if (const char *LDMOption = getLDMOption(ToolChain.getTriple(), Args)) {
427    CmdArgs.push_back("-m");
428    CmdArgs.push_back(LDMOption);
429  } else {
430    D.Diag(diag::err_target_unknown_triple) << Triple.str();
431    return;
432  }
433
434  if (IsStatic) {
435    if (Arch == llvm::Triple::arm || Arch == llvm::Triple::armeb ||
436        Arch == llvm::Triple::thumb || Arch == llvm::Triple::thumbeb)
437      CmdArgs.push_back("-Bstatic");
438    else
439      CmdArgs.push_back("-static");
440  } else if (Args.hasArg(options::OPT_shared)) {
441    CmdArgs.push_back("-shared");
442  }
443
444  if (!IsStatic) {
445    if (Args.hasArg(options::OPT_rdynamic))
446      CmdArgs.push_back("-export-dynamic");
447
448    if (!Args.hasArg(options::OPT_shared) && !IsStaticPIE) {
449      const std::string Loader =
450          D.DyldPrefix + ToolChain.getDynamicLinker(Args);
451      CmdArgs.push_back("-dynamic-linker");
452      CmdArgs.push_back(Args.MakeArgString(Loader));
453    }
454  }
455
456  CmdArgs.push_back("-o");
457  CmdArgs.push_back(Output.getFilename());
458
459  if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles)) {
460    if (!isAndroid && !IsIAMCU) {
461      const char *crt1 = nullptr;
462      if (!Args.hasArg(options::OPT_shared)) {
463        if (Args.hasArg(options::OPT_pg))
464          crt1 = "gcrt1.o";
465        else if (IsPIE)
466          crt1 = "Scrt1.o";
467        else if (IsStaticPIE)
468          crt1 = "rcrt1.o";
469        else
470          crt1 = "crt1.o";
471      }
472      if (crt1)
473        CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crt1)));
474
475      CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crti.o")));
476    }
477
478    if (IsIAMCU)
479      CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crt0.o")));
480    else if (HasCRTBeginEndFiles) {
481      std::string P;
482      if (ToolChain.GetRuntimeLibType(Args) == ToolChain::RLT_CompilerRT &&
483          !isAndroid) {
484        std::string crtbegin = ToolChain.getCompilerRT(Args, "crtbegin",
485                                                       ToolChain::FT_Object);
486        if (ToolChain.getVFS().exists(crtbegin))
487          P = crtbegin;
488      }
489      if (P.empty()) {
490        const char *crtbegin;
491        if (IsStatic)
492          crtbegin = isAndroid ? "crtbegin_static.o" : "crtbeginT.o";
493        else if (Args.hasArg(options::OPT_shared))
494          crtbegin = isAndroid ? "crtbegin_so.o" : "crtbeginS.o";
495        else if (IsPIE || IsStaticPIE)
496          crtbegin = isAndroid ? "crtbegin_dynamic.o" : "crtbeginS.o";
497        else
498          crtbegin = isAndroid ? "crtbegin_dynamic.o" : "crtbegin.o";
499        P = ToolChain.GetFilePath(crtbegin);
500      }
501      CmdArgs.push_back(Args.MakeArgString(P));
502    }
503
504    // Add crtfastmath.o if available and fast math is enabled.
505    ToolChain.AddFastMathRuntimeIfAvailable(Args, CmdArgs);
506  }
507
508  Args.AddAllArgs(CmdArgs, options::OPT_L);
509  Args.AddAllArgs(CmdArgs, options::OPT_u);
510
511  ToolChain.AddFilePathLibArgs(Args, CmdArgs);
512
513  if (D.isUsingLTO()) {
514    assert(!Inputs.empty() && "Must have at least one input.");
515    AddGoldPlugin(ToolChain, Args, CmdArgs, Output, Inputs[0],
516                  D.getLTOMode() == LTOK_Thin);
517  }
518
519  if (Args.hasArg(options::OPT_Z_Xlinker__no_demangle))
520    CmdArgs.push_back("--no-demangle");
521
522  bool NeedsSanitizerDeps = addSanitizerRuntimes(ToolChain, Args, CmdArgs);
523  bool NeedsXRayDeps = addXRayRuntime(ToolChain, Args, CmdArgs);
524  AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);
525  // The profile runtime also needs access to system libraries.
526  getToolChain().addProfileRTLibs(Args, CmdArgs);
527
528  if (D.CCCIsCXX() &&
529      !Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
530    if (ToolChain.ShouldLinkCXXStdlib(Args)) {
531      bool OnlyLibstdcxxStatic = Args.hasArg(options::OPT_static_libstdcxx) &&
532                                 !Args.hasArg(options::OPT_static);
533      if (OnlyLibstdcxxStatic)
534        CmdArgs.push_back("-Bstatic");
535      ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
536      if (OnlyLibstdcxxStatic)
537        CmdArgs.push_back("-Bdynamic");
538    }
539    CmdArgs.push_back("-lm");
540  }
541  // Silence warnings when linking C code with a C++ '-stdlib' argument.
542  Args.ClaimAllArgs(options::OPT_stdlib_EQ);
543
544  if (!Args.hasArg(options::OPT_nostdlib)) {
545    if (!Args.hasArg(options::OPT_nodefaultlibs)) {
546      if (IsStatic || IsStaticPIE)
547        CmdArgs.push_back("--start-group");
548
549      if (NeedsSanitizerDeps)
550        linkSanitizerRuntimeDeps(ToolChain, CmdArgs);
551
552      if (NeedsXRayDeps)
553        linkXRayRuntimeDeps(ToolChain, CmdArgs);
554
555      bool WantPthread = Args.hasArg(options::OPT_pthread) ||
556                         Args.hasArg(options::OPT_pthreads);
557
558      // Use the static OpenMP runtime with -static-openmp
559      bool StaticOpenMP = Args.hasArg(options::OPT_static_openmp) &&
560                          !Args.hasArg(options::OPT_static);
561
562      // FIXME: Only pass GompNeedsRT = true for platforms with libgomp that
563      // require librt. Most modern Linux platforms do, but some may not.
564      if (addOpenMPRuntime(CmdArgs, ToolChain, Args, StaticOpenMP,
565                           JA.isHostOffloading(Action::OFK_OpenMP),
566                           /* GompNeedsRT= */ true))
567        // OpenMP runtimes implies pthreads when using the GNU toolchain.
568        // FIXME: Does this really make sense for all GNU toolchains?
569        WantPthread = true;
570
571      AddRunTimeLibs(ToolChain, D, CmdArgs, Args);
572
573      if (WantPthread && !isAndroid)
574        CmdArgs.push_back("-lpthread");
575
576      if (Args.hasArg(options::OPT_fsplit_stack))
577        CmdArgs.push_back("--wrap=pthread_create");
578
579      if (!Args.hasArg(options::OPT_nolibc))
580        CmdArgs.push_back("-lc");
581
582      // Add IAMCU specific libs, if needed.
583      if (IsIAMCU)
584        CmdArgs.push_back("-lgloss");
585
586      if (IsStatic || IsStaticPIE)
587        CmdArgs.push_back("--end-group");
588      else
589        AddRunTimeLibs(ToolChain, D, CmdArgs, Args);
590
591      // Add IAMCU specific libs (outside the group), if needed.
592      if (IsIAMCU) {
593        CmdArgs.push_back("--as-needed");
594        CmdArgs.push_back("-lsoftfp");
595        CmdArgs.push_back("--no-as-needed");
596      }
597    }
598
599    if (!Args.hasArg(options::OPT_nostartfiles) && !IsIAMCU) {
600      if (HasCRTBeginEndFiles) {
601        std::string P;
602        if (ToolChain.GetRuntimeLibType(Args) == ToolChain::RLT_CompilerRT &&
603            !isAndroid) {
604          std::string crtend = ToolChain.getCompilerRT(Args, "crtend",
605                                                       ToolChain::FT_Object);
606          if (ToolChain.getVFS().exists(crtend))
607            P = crtend;
608        }
609        if (P.empty()) {
610          const char *crtend;
611          if (Args.hasArg(options::OPT_shared))
612            crtend = isAndroid ? "crtend_so.o" : "crtendS.o";
613          else if (IsPIE || IsStaticPIE)
614            crtend = isAndroid ? "crtend_android.o" : "crtendS.o";
615          else
616            crtend = isAndroid ? "crtend_android.o" : "crtend.o";
617          P = ToolChain.GetFilePath(crtend);
618        }
619        CmdArgs.push_back(Args.MakeArgString(P));
620      }
621      if (!isAndroid)
622        CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crtn.o")));
623    }
624  }
625
626  // Add HIP offloading linker script args if required.
627  AddHIPLinkerScript(getToolChain(), C, Output, Inputs, Args, CmdArgs, JA,
628                     *this);
629
630  const char *Exec = Args.MakeArgString(ToolChain.GetLinkerPath());
631  C.addCommand(std::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));
632}
633
634void tools::gnutools::Assembler::ConstructJob(Compilation &C,
635                                              const JobAction &JA,
636                                              const InputInfo &Output,
637                                              const InputInfoList &Inputs,
638                                              const ArgList &Args,
639                                              const char *LinkingOutput) const {
640  const auto &D = getToolChain().getDriver();
641
642  claimNoWarnArgs(Args);
643
644  ArgStringList CmdArgs;
645
646  llvm::Reloc::Model RelocationModel;
647  unsigned PICLevel;
648  bool IsPIE;
649  std::tie(RelocationModel, PICLevel, IsPIE) =
650      ParsePICArgs(getToolChain(), Args);
651
652  if (const Arg *A = Args.getLastArg(options::OPT_gz, options::OPT_gz_EQ)) {
653    if (A->getOption().getID() == options::OPT_gz) {
654      CmdArgs.push_back("--compress-debug-sections");
655    } else {
656      StringRef Value = A->getValue();
657      if (Value == "none" || Value == "zlib" || Value == "zlib-gnu") {
658        CmdArgs.push_back(
659            Args.MakeArgString("--compress-debug-sections=" + Twine(Value)));
660      } else {
661        D.Diag(diag::err_drv_unsupported_option_argument)
662            << A->getOption().getName() << Value;
663      }
664    }
665  }
666
667  if (getToolChain().isNoExecStackDefault()) {
668      CmdArgs.push_back("--noexecstack");
669  }
670
671  switch (getToolChain().getArch()) {
672  default:
673    break;
674  // Add --32/--64 to make sure we get the format we want.
675  // This is incomplete
676  case llvm::Triple::x86:
677    CmdArgs.push_back("--32");
678    break;
679  case llvm::Triple::x86_64:
680    if (getToolChain().getTriple().getEnvironment() == llvm::Triple::GNUX32)
681      CmdArgs.push_back("--x32");
682    else
683      CmdArgs.push_back("--64");
684    break;
685  case llvm::Triple::ppc: {
686    CmdArgs.push_back("-a32");
687    CmdArgs.push_back("-mppc");
688    CmdArgs.push_back(
689      ppc::getPPCAsmModeForCPU(getCPUName(Args, getToolChain().getTriple())));
690    break;
691  }
692  case llvm::Triple::ppc64: {
693    CmdArgs.push_back("-a64");
694    CmdArgs.push_back("-mppc64");
695    CmdArgs.push_back(
696      ppc::getPPCAsmModeForCPU(getCPUName(Args, getToolChain().getTriple())));
697    break;
698  }
699  case llvm::Triple::ppc64le: {
700    CmdArgs.push_back("-a64");
701    CmdArgs.push_back("-mppc64");
702    CmdArgs.push_back("-mlittle-endian");
703    CmdArgs.push_back(
704      ppc::getPPCAsmModeForCPU(getCPUName(Args, getToolChain().getTriple())));
705    break;
706  }
707  case llvm::Triple::riscv32:
708  case llvm::Triple::riscv64: {
709    StringRef ABIName = riscv::getRISCVABI(Args, getToolChain().getTriple());
710    CmdArgs.push_back("-mabi");
711    CmdArgs.push_back(ABIName.data());
712    StringRef MArchName = riscv::getRISCVArch(Args, getToolChain().getTriple());
713    CmdArgs.push_back("-march");
714    CmdArgs.push_back(MArchName.data());
715    break;
716  }
717  case llvm::Triple::sparc:
718  case llvm::Triple::sparcel: {
719    CmdArgs.push_back("-32");
720    std::string CPU = getCPUName(Args, getToolChain().getTriple());
721    CmdArgs.push_back(
722        sparc::getSparcAsmModeForCPU(CPU, getToolChain().getTriple()));
723    AddAssemblerKPIC(getToolChain(), Args, CmdArgs);
724    break;
725  }
726  case llvm::Triple::sparcv9: {
727    CmdArgs.push_back("-64");
728    std::string CPU = getCPUName(Args, getToolChain().getTriple());
729    CmdArgs.push_back(
730        sparc::getSparcAsmModeForCPU(CPU, getToolChain().getTriple()));
731    AddAssemblerKPIC(getToolChain(), Args, CmdArgs);
732    break;
733  }
734  case llvm::Triple::arm:
735  case llvm::Triple::armeb:
736  case llvm::Triple::thumb:
737  case llvm::Triple::thumbeb: {
738    const llvm::Triple &Triple2 = getToolChain().getTriple();
739    CmdArgs.push_back(isArmBigEndian(Triple2, Args) ? "-EB" : "-EL");
740    switch (Triple2.getSubArch()) {
741    case llvm::Triple::ARMSubArch_v7:
742      CmdArgs.push_back("-mfpu=neon");
743      break;
744    case llvm::Triple::ARMSubArch_v8:
745      CmdArgs.push_back("-mfpu=crypto-neon-fp-armv8");
746      break;
747    default:
748      break;
749    }
750
751    switch (arm::getARMFloatABI(getToolChain(), Args)) {
752    case arm::FloatABI::Invalid: llvm_unreachable("must have an ABI!");
753    case arm::FloatABI::Soft:
754      CmdArgs.push_back(Args.MakeArgString("-mfloat-abi=soft"));
755      break;
756    case arm::FloatABI::SoftFP:
757      CmdArgs.push_back(Args.MakeArgString("-mfloat-abi=softfp"));
758      break;
759    case arm::FloatABI::Hard:
760      CmdArgs.push_back(Args.MakeArgString("-mfloat-abi=hard"));
761      break;
762    }
763
764    Args.AddLastArg(CmdArgs, options::OPT_march_EQ);
765    normalizeCPUNamesForAssembler(Args, CmdArgs);
766
767    Args.AddLastArg(CmdArgs, options::OPT_mfpu_EQ);
768    break;
769  }
770  case llvm::Triple::aarch64:
771  case llvm::Triple::aarch64_be: {
772    CmdArgs.push_back(
773        getToolChain().getArch() == llvm::Triple::aarch64_be ? "-EB" : "-EL");
774    Args.AddLastArg(CmdArgs, options::OPT_march_EQ);
775    normalizeCPUNamesForAssembler(Args, CmdArgs);
776
777    break;
778  }
779  case llvm::Triple::mips:
780  case llvm::Triple::mipsel:
781  case llvm::Triple::mips64:
782  case llvm::Triple::mips64el: {
783    StringRef CPUName;
784    StringRef ABIName;
785    mips::getMipsCPUAndABI(Args, getToolChain().getTriple(), CPUName, ABIName);
786    ABIName = mips::getGnuCompatibleMipsABIName(ABIName);
787
788    CmdArgs.push_back("-march");
789    CmdArgs.push_back(CPUName.data());
790
791    CmdArgs.push_back("-mabi");
792    CmdArgs.push_back(ABIName.data());
793
794    // -mno-shared should be emitted unless -fpic, -fpie, -fPIC, -fPIE,
795    // or -mshared (not implemented) is in effect.
796    if (RelocationModel == llvm::Reloc::Static)
797      CmdArgs.push_back("-mno-shared");
798
799    // LLVM doesn't support -mplt yet and acts as if it is always given.
800    // However, -mplt has no effect with the N64 ABI.
801    if (ABIName != "64" && !Args.hasArg(options::OPT_mno_abicalls))
802      CmdArgs.push_back("-call_nonpic");
803
804    if (getToolChain().getTriple().isLittleEndian())
805      CmdArgs.push_back("-EL");
806    else
807      CmdArgs.push_back("-EB");
808
809    if (Arg *A = Args.getLastArg(options::OPT_mnan_EQ)) {
810      if (StringRef(A->getValue()) == "2008")
811        CmdArgs.push_back(Args.MakeArgString("-mnan=2008"));
812    }
813
814    // Add the last -mfp32/-mfpxx/-mfp64 or -mfpxx if it is enabled by default.
815    if (Arg *A = Args.getLastArg(options::OPT_mfp32, options::OPT_mfpxx,
816                                 options::OPT_mfp64)) {
817      A->claim();
818      A->render(Args, CmdArgs);
819    } else if (mips::shouldUseFPXX(
820                   Args, getToolChain().getTriple(), CPUName, ABIName,
821                   mips::getMipsFloatABI(getToolChain().getDriver(), Args,
822                                         getToolChain().getTriple())))
823      CmdArgs.push_back("-mfpxx");
824
825    // Pass on -mmips16 or -mno-mips16. However, the assembler equivalent of
826    // -mno-mips16 is actually -no-mips16.
827    if (Arg *A =
828            Args.getLastArg(options::OPT_mips16, options::OPT_mno_mips16)) {
829      if (A->getOption().matches(options::OPT_mips16)) {
830        A->claim();
831        A->render(Args, CmdArgs);
832      } else {
833        A->claim();
834        CmdArgs.push_back("-no-mips16");
835      }
836    }
837
838    Args.AddLastArg(CmdArgs, options::OPT_mmicromips,
839                    options::OPT_mno_micromips);
840    Args.AddLastArg(CmdArgs, options::OPT_mdsp, options::OPT_mno_dsp);
841    Args.AddLastArg(CmdArgs, options::OPT_mdspr2, options::OPT_mno_dspr2);
842
843    if (Arg *A = Args.getLastArg(options::OPT_mmsa, options::OPT_mno_msa)) {
844      // Do not use AddLastArg because not all versions of MIPS assembler
845      // support -mmsa / -mno-msa options.
846      if (A->getOption().matches(options::OPT_mmsa))
847        CmdArgs.push_back(Args.MakeArgString("-mmsa"));
848    }
849
850    Args.AddLastArg(CmdArgs, options::OPT_mhard_float,
851                    options::OPT_msoft_float);
852
853    Args.AddLastArg(CmdArgs, options::OPT_mdouble_float,
854                    options::OPT_msingle_float);
855
856    Args.AddLastArg(CmdArgs, options::OPT_modd_spreg,
857                    options::OPT_mno_odd_spreg);
858
859    AddAssemblerKPIC(getToolChain(), Args, CmdArgs);
860    break;
861  }
862  case llvm::Triple::systemz: {
863    // Always pass an -march option, since our default of z10 is later
864    // than the GNU assembler's default.
865    std::string CPUName = systemz::getSystemZTargetCPU(Args);
866    CmdArgs.push_back(Args.MakeArgString("-march=" + CPUName));
867    break;
868  }
869  }
870
871  for (const Arg *A : Args.filtered(options::OPT_ffile_prefix_map_EQ,
872                                    options::OPT_fdebug_prefix_map_EQ)) {
873    StringRef Map = A->getValue();
874    if (Map.find('=') == StringRef::npos)
875      D.Diag(diag::err_drv_invalid_argument_to_option)
876          << Map << A->getOption().getName();
877    else {
878      CmdArgs.push_back(Args.MakeArgString("--debug-prefix-map"));
879      CmdArgs.push_back(Args.MakeArgString(Map));
880    }
881    A->claim();
882  }
883
884  Args.AddAllArgs(CmdArgs, options::OPT_I);
885  Args.AddAllArgValues(CmdArgs, options::OPT_Wa_COMMA, options::OPT_Xassembler);
886
887  CmdArgs.push_back("-o");
888  CmdArgs.push_back(Output.getFilename());
889
890  for (const auto &II : Inputs)
891    CmdArgs.push_back(II.getFilename());
892
893  const char *Exec = Args.MakeArgString(getToolChain().GetProgramPath("as"));
894  C.addCommand(std::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));
895
896  // Handle the debug info splitting at object creation time if we're
897  // creating an object.
898  // TODO: Currently only works on linux with newer objcopy.
899  if (Args.hasArg(options::OPT_gsplit_dwarf) &&
900      getToolChain().getTriple().isOSLinux())
901    SplitDebugInfo(getToolChain(), C, *this, JA, Args, Output,
902                   SplitDebugName(Args, Inputs[0], Output));
903}
904
905namespace {
906// Filter to remove Multilibs that don't exist as a suffix to Path
907class FilterNonExistent {
908  StringRef Base, File;
909  llvm::vfs::FileSystem &VFS;
910
911public:
912  FilterNonExistent(StringRef Base, StringRef File, llvm::vfs::FileSystem &VFS)
913      : Base(Base), File(File), VFS(VFS) {}
914  bool operator()(const Multilib &M) {
915    return !VFS.exists(Base + M.gccSuffix() + File);
916  }
917};
918} // end anonymous namespace
919
920static bool isSoftFloatABI(const ArgList &Args) {
921  Arg *A = Args.getLastArg(options::OPT_msoft_float, options::OPT_mhard_float,
922                           options::OPT_mfloat_abi_EQ);
923  if (!A)
924    return false;
925
926  return A->getOption().matches(options::OPT_msoft_float) ||
927         (A->getOption().matches(options::OPT_mfloat_abi_EQ) &&
928          A->getValue() == StringRef("soft"));
929}
930
931static bool isArmOrThumbArch(llvm::Triple::ArchType Arch) {
932  return Arch == llvm::Triple::arm || Arch == llvm::Triple::thumb;
933}
934
935static bool isMipsEL(llvm::Triple::ArchType Arch) {
936  return Arch == llvm::Triple::mipsel || Arch == llvm::Triple::mips64el;
937}
938
939static bool isMips16(const ArgList &Args) {
940  Arg *A = Args.getLastArg(options::OPT_mips16, options::OPT_mno_mips16);
941  return A && A->getOption().matches(options::OPT_mips16);
942}
943
944static bool isMicroMips(const ArgList &Args) {
945  Arg *A = Args.getLastArg(options::OPT_mmicromips, options::OPT_mno_micromips);
946  return A && A->getOption().matches(options::OPT_mmicromips);
947}
948
949static bool isMSP430(llvm::Triple::ArchType Arch) {
950  return Arch == llvm::Triple::msp430;
951}
952
953static Multilib makeMultilib(StringRef commonSuffix) {
954  return Multilib(commonSuffix, commonSuffix, commonSuffix);
955}
956
957static bool findMipsCsMultilibs(const Multilib::flags_list &Flags,
958                                FilterNonExistent &NonExistent,
959                                DetectedMultilibs &Result) {
960  // Check for Code Sourcery toolchain multilibs
961  MultilibSet CSMipsMultilibs;
962  {
963    auto MArchMips16 = makeMultilib("/mips16").flag("+m32").flag("+mips16");
964
965    auto MArchMicroMips =
966        makeMultilib("/micromips").flag("+m32").flag("+mmicromips");
967
968    auto MArchDefault = makeMultilib("").flag("-mips16").flag("-mmicromips");
969
970    auto UCLibc = makeMultilib("/uclibc").flag("+muclibc");
971
972    auto SoftFloat = makeMultilib("/soft-float").flag("+msoft-float");
973
974    auto Nan2008 = makeMultilib("/nan2008").flag("+mnan=2008");
975
976    auto DefaultFloat =
977        makeMultilib("").flag("-msoft-float").flag("-mnan=2008");
978
979    auto BigEndian = makeMultilib("").flag("+EB").flag("-EL");
980
981    auto LittleEndian = makeMultilib("/el").flag("+EL").flag("-EB");
982
983    // Note that this one's osSuffix is ""
984    auto MAbi64 = makeMultilib("")
985                      .gccSuffix("/64")
986                      .includeSuffix("/64")
987                      .flag("+mabi=n64")
988                      .flag("-mabi=n32")
989                      .flag("-m32");
990
991    CSMipsMultilibs =
992        MultilibSet()
993            .Either(MArchMips16, MArchMicroMips, MArchDefault)
994            .Maybe(UCLibc)
995            .Either(SoftFloat, Nan2008, DefaultFloat)
996            .FilterOut("/micromips/nan2008")
997            .FilterOut("/mips16/nan2008")
998            .Either(BigEndian, LittleEndian)
999            .Maybe(MAbi64)
1000            .FilterOut("/mips16.*/64")
1001            .FilterOut("/micromips.*/64")
1002            .FilterOut(NonExistent)
1003            .setIncludeDirsCallback([](const Multilib &M) {
1004              std::vector<std::string> Dirs({"/include"});
1005              if (StringRef(M.includeSuffix()).startswith("/uclibc"))
1006                Dirs.push_back(
1007                    "/../../../../mips-linux-gnu/libc/uclibc/usr/include");
1008              else
1009                Dirs.push_back("/../../../../mips-linux-gnu/libc/usr/include");
1010              return Dirs;
1011            });
1012  }
1013
1014  MultilibSet DebianMipsMultilibs;
1015  {
1016    Multilib MAbiN32 =
1017        Multilib().gccSuffix("/n32").includeSuffix("/n32").flag("+mabi=n32");
1018
1019    Multilib M64 = Multilib()
1020                       .gccSuffix("/64")
1021                       .includeSuffix("/64")
1022                       .flag("+m64")
1023                       .flag("-m32")
1024                       .flag("-mabi=n32");
1025
1026    Multilib M32 = Multilib().flag("-m64").flag("+m32").flag("-mabi=n32");
1027
1028    DebianMipsMultilibs =
1029        MultilibSet().Either(M32, M64, MAbiN32).FilterOut(NonExistent);
1030  }
1031
1032  // Sort candidates. Toolchain that best meets the directories tree goes first.
1033  // Then select the first toolchains matches command line flags.
1034  MultilibSet *Candidates[] = {&CSMipsMultilibs, &DebianMipsMultilibs};
1035  if (CSMipsMultilibs.size() < DebianMipsMultilibs.size())
1036    std::iter_swap(Candidates, Candidates + 1);
1037  for (const MultilibSet *Candidate : Candidates) {
1038    if (Candidate->select(Flags, Result.SelectedMultilib)) {
1039      if (Candidate == &DebianMipsMultilibs)
1040        Result.BiarchSibling = Multilib();
1041      Result.Multilibs = *Candidate;
1042      return true;
1043    }
1044  }
1045  return false;
1046}
1047
1048static bool findMipsAndroidMultilibs(llvm::vfs::FileSystem &VFS, StringRef Path,
1049                                     const Multilib::flags_list &Flags,
1050                                     FilterNonExistent &NonExistent,
1051                                     DetectedMultilibs &Result) {
1052
1053  MultilibSet AndroidMipsMultilibs =
1054      MultilibSet()
1055          .Maybe(Multilib("/mips-r2").flag("+march=mips32r2"))
1056          .Maybe(Multilib("/mips-r6").flag("+march=mips32r6"))
1057          .FilterOut(NonExistent);
1058
1059  MultilibSet AndroidMipselMultilibs =
1060      MultilibSet()
1061          .Either(Multilib().flag("+march=mips32"),
1062                  Multilib("/mips-r2", "", "/mips-r2").flag("+march=mips32r2"),
1063                  Multilib("/mips-r6", "", "/mips-r6").flag("+march=mips32r6"))
1064          .FilterOut(NonExistent);
1065
1066  MultilibSet AndroidMips64elMultilibs =
1067      MultilibSet()
1068          .Either(
1069              Multilib().flag("+march=mips64r6"),
1070              Multilib("/32/mips-r1", "", "/mips-r1").flag("+march=mips32"),
1071              Multilib("/32/mips-r2", "", "/mips-r2").flag("+march=mips32r2"),
1072              Multilib("/32/mips-r6", "", "/mips-r6").flag("+march=mips32r6"))
1073          .FilterOut(NonExistent);
1074
1075  MultilibSet *MS = &AndroidMipsMultilibs;
1076  if (VFS.exists(Path + "/mips-r6"))
1077    MS = &AndroidMipselMultilibs;
1078  else if (VFS.exists(Path + "/32"))
1079    MS = &AndroidMips64elMultilibs;
1080  if (MS->select(Flags, Result.SelectedMultilib)) {
1081    Result.Multilibs = *MS;
1082    return true;
1083  }
1084  return false;
1085}
1086
1087static bool findMipsMuslMultilibs(const Multilib::flags_list &Flags,
1088                                  FilterNonExistent &NonExistent,
1089                                  DetectedMultilibs &Result) {
1090  // Musl toolchain multilibs
1091  MultilibSet MuslMipsMultilibs;
1092  {
1093    auto MArchMipsR2 = makeMultilib("")
1094                           .osSuffix("/mips-r2-hard-musl")
1095                           .flag("+EB")
1096                           .flag("-EL")
1097                           .flag("+march=mips32r2");
1098
1099    auto MArchMipselR2 = makeMultilib("/mipsel-r2-hard-musl")
1100                             .flag("-EB")
1101                             .flag("+EL")
1102                             .flag("+march=mips32r2");
1103
1104    MuslMipsMultilibs = MultilibSet().Either(MArchMipsR2, MArchMipselR2);
1105
1106    // Specify the callback that computes the include directories.
1107    MuslMipsMultilibs.setIncludeDirsCallback([](const Multilib &M) {
1108      return std::vector<std::string>(
1109          {"/../sysroot" + M.osSuffix() + "/usr/include"});
1110    });
1111  }
1112  if (MuslMipsMultilibs.select(Flags, Result.SelectedMultilib)) {
1113    Result.Multilibs = MuslMipsMultilibs;
1114    return true;
1115  }
1116  return false;
1117}
1118
1119static bool findMipsMtiMultilibs(const Multilib::flags_list &Flags,
1120                                 FilterNonExistent &NonExistent,
1121                                 DetectedMultilibs &Result) {
1122  // CodeScape MTI toolchain v1.2 and early.
1123  MultilibSet MtiMipsMultilibsV1;
1124  {
1125    auto MArchMips32 = makeMultilib("/mips32")
1126                           .flag("+m32")
1127                           .flag("-m64")
1128                           .flag("-mmicromips")
1129                           .flag("+march=mips32");
1130
1131    auto MArchMicroMips = makeMultilib("/micromips")
1132                              .flag("+m32")
1133                              .flag("-m64")
1134                              .flag("+mmicromips");
1135
1136    auto MArchMips64r2 = makeMultilib("/mips64r2")
1137                             .flag("-m32")
1138                             .flag("+m64")
1139                             .flag("+march=mips64r2");
1140
1141    auto MArchMips64 = makeMultilib("/mips64").flag("-m32").flag("+m64").flag(
1142        "-march=mips64r2");
1143
1144    auto MArchDefault = makeMultilib("")
1145                            .flag("+m32")
1146                            .flag("-m64")
1147                            .flag("-mmicromips")
1148                            .flag("+march=mips32r2");
1149
1150    auto Mips16 = makeMultilib("/mips16").flag("+mips16");
1151
1152    auto UCLibc = makeMultilib("/uclibc").flag("+muclibc");
1153
1154    auto MAbi64 =
1155        makeMultilib("/64").flag("+mabi=n64").flag("-mabi=n32").flag("-m32");
1156
1157    auto BigEndian = makeMultilib("").flag("+EB").flag("-EL");
1158
1159    auto LittleEndian = makeMultilib("/el").flag("+EL").flag("-EB");
1160
1161    auto SoftFloat = makeMultilib("/sof").flag("+msoft-float");
1162
1163    auto Nan2008 = makeMultilib("/nan2008").flag("+mnan=2008");
1164
1165    MtiMipsMultilibsV1 =
1166        MultilibSet()
1167            .Either(MArchMips32, MArchMicroMips, MArchMips64r2, MArchMips64,
1168                    MArchDefault)
1169            .Maybe(UCLibc)
1170            .Maybe(Mips16)
1171            .FilterOut("/mips64/mips16")
1172            .FilterOut("/mips64r2/mips16")
1173            .FilterOut("/micromips/mips16")
1174            .Maybe(MAbi64)
1175            .FilterOut("/micromips/64")
1176            .FilterOut("/mips32/64")
1177            .FilterOut("^/64")
1178            .FilterOut("/mips16/64")
1179            .Either(BigEndian, LittleEndian)
1180            .Maybe(SoftFloat)
1181            .Maybe(Nan2008)
1182            .FilterOut(".*sof/nan2008")
1183            .FilterOut(NonExistent)
1184            .setIncludeDirsCallback([](const Multilib &M) {
1185              std::vector<std::string> Dirs({"/include"});
1186              if (StringRef(M.includeSuffix()).startswith("/uclibc"))
1187                Dirs.push_back("/../../../../sysroot/uclibc/usr/include");
1188              else
1189                Dirs.push_back("/../../../../sysroot/usr/include");
1190              return Dirs;
1191            });
1192  }
1193
1194  // CodeScape IMG toolchain starting from v1.3.
1195  MultilibSet MtiMipsMultilibsV2;
1196  {
1197    auto BeHard = makeMultilib("/mips-r2-hard")
1198                      .flag("+EB")
1199                      .flag("-msoft-float")
1200                      .flag("-mnan=2008")
1201                      .flag("-muclibc");
1202    auto BeSoft = makeMultilib("/mips-r2-soft")
1203                      .flag("+EB")
1204                      .flag("+msoft-float")
1205                      .flag("-mnan=2008");
1206    auto ElHard = makeMultilib("/mipsel-r2-hard")
1207                      .flag("+EL")
1208                      .flag("-msoft-float")
1209                      .flag("-mnan=2008")
1210                      .flag("-muclibc");
1211    auto ElSoft = makeMultilib("/mipsel-r2-soft")
1212                      .flag("+EL")
1213                      .flag("+msoft-float")
1214                      .flag("-mnan=2008")
1215                      .flag("-mmicromips");
1216    auto BeHardNan = makeMultilib("/mips-r2-hard-nan2008")
1217                         .flag("+EB")
1218                         .flag("-msoft-float")
1219                         .flag("+mnan=2008")
1220                         .flag("-muclibc");
1221    auto ElHardNan = makeMultilib("/mipsel-r2-hard-nan2008")
1222                         .flag("+EL")
1223                         .flag("-msoft-float")
1224                         .flag("+mnan=2008")
1225                         .flag("-muclibc")
1226                         .flag("-mmicromips");
1227    auto BeHardNanUclibc = makeMultilib("/mips-r2-hard-nan2008-uclibc")
1228                               .flag("+EB")
1229                               .flag("-msoft-float")
1230                               .flag("+mnan=2008")
1231                               .flag("+muclibc");
1232    auto ElHardNanUclibc = makeMultilib("/mipsel-r2-hard-nan2008-uclibc")
1233                               .flag("+EL")
1234                               .flag("-msoft-float")
1235                               .flag("+mnan=2008")
1236                               .flag("+muclibc");
1237    auto BeHardUclibc = makeMultilib("/mips-r2-hard-uclibc")
1238                            .flag("+EB")
1239                            .flag("-msoft-float")
1240                            .flag("-mnan=2008")
1241                            .flag("+muclibc");
1242    auto ElHardUclibc = makeMultilib("/mipsel-r2-hard-uclibc")
1243                            .flag("+EL")
1244                            .flag("-msoft-float")
1245                            .flag("-mnan=2008")
1246                            .flag("+muclibc");
1247    auto ElMicroHardNan = makeMultilib("/micromipsel-r2-hard-nan2008")
1248                              .flag("+EL")
1249                              .flag("-msoft-float")
1250                              .flag("+mnan=2008")
1251                              .flag("+mmicromips");
1252    auto ElMicroSoft = makeMultilib("/micromipsel-r2-soft")
1253                           .flag("+EL")
1254                           .flag("+msoft-float")
1255                           .flag("-mnan=2008")
1256                           .flag("+mmicromips");
1257
1258    auto O32 =
1259        makeMultilib("/lib").osSuffix("").flag("-mabi=n32").flag("-mabi=n64");
1260    auto N32 =
1261        makeMultilib("/lib32").osSuffix("").flag("+mabi=n32").flag("-mabi=n64");
1262    auto N64 =
1263        makeMultilib("/lib64").osSuffix("").flag("-mabi=n32").flag("+mabi=n64");
1264
1265    MtiMipsMultilibsV2 =
1266        MultilibSet()
1267            .Either({BeHard, BeSoft, ElHard, ElSoft, BeHardNan, ElHardNan,
1268                     BeHardNanUclibc, ElHardNanUclibc, BeHardUclibc,
1269                     ElHardUclibc, ElMicroHardNan, ElMicroSoft})
1270            .Either(O32, N32, N64)
1271            .FilterOut(NonExistent)
1272            .setIncludeDirsCallback([](const Multilib &M) {
1273              return std::vector<std::string>({"/../../../../sysroot" +
1274                                               M.includeSuffix() +
1275                                               "/../usr/include"});
1276            })
1277            .setFilePathsCallback([](const Multilib &M) {
1278              return std::vector<std::string>(
1279                  {"/../../../../mips-mti-linux-gnu/lib" + M.gccSuffix()});
1280            });
1281  }
1282  for (auto Candidate : {&MtiMipsMultilibsV1, &MtiMipsMultilibsV2}) {
1283    if (Candidate->select(Flags, Result.SelectedMultilib)) {
1284      Result.Multilibs = *Candidate;
1285      return true;
1286    }
1287  }
1288  return false;
1289}
1290
1291static bool findMipsImgMultilibs(const Multilib::flags_list &Flags,
1292                                 FilterNonExistent &NonExistent,
1293                                 DetectedMultilibs &Result) {
1294  // CodeScape IMG toolchain v1.2 and early.
1295  MultilibSet ImgMultilibsV1;
1296  {
1297    auto Mips64r6 = makeMultilib("/mips64r6").flag("+m64").flag("-m32");
1298
1299    auto LittleEndian = makeMultilib("/el").flag("+EL").flag("-EB");
1300
1301    auto MAbi64 =
1302        makeMultilib("/64").flag("+mabi=n64").flag("-mabi=n32").flag("-m32");
1303
1304    ImgMultilibsV1 =
1305        MultilibSet()
1306            .Maybe(Mips64r6)
1307            .Maybe(MAbi64)
1308            .Maybe(LittleEndian)
1309            .FilterOut(NonExistent)
1310            .setIncludeDirsCallback([](const Multilib &M) {
1311              return std::vector<std::string>(
1312                  {"/include", "/../../../../sysroot/usr/include"});
1313            });
1314  }
1315
1316  // CodeScape IMG toolchain starting from v1.3.
1317  MultilibSet ImgMultilibsV2;
1318  {
1319    auto BeHard = makeMultilib("/mips-r6-hard")
1320                      .flag("+EB")
1321                      .flag("-msoft-float")
1322                      .flag("-mmicromips");
1323    auto BeSoft = makeMultilib("/mips-r6-soft")
1324                      .flag("+EB")
1325                      .flag("+msoft-float")
1326                      .flag("-mmicromips");
1327    auto ElHard = makeMultilib("/mipsel-r6-hard")
1328                      .flag("+EL")
1329                      .flag("-msoft-float")
1330                      .flag("-mmicromips");
1331    auto ElSoft = makeMultilib("/mipsel-r6-soft")
1332                      .flag("+EL")
1333                      .flag("+msoft-float")
1334                      .flag("-mmicromips");
1335    auto BeMicroHard = makeMultilib("/micromips-r6-hard")
1336                           .flag("+EB")
1337                           .flag("-msoft-float")
1338                           .flag("+mmicromips");
1339    auto BeMicroSoft = makeMultilib("/micromips-r6-soft")
1340                           .flag("+EB")
1341                           .flag("+msoft-float")
1342                           .flag("+mmicromips");
1343    auto ElMicroHard = makeMultilib("/micromipsel-r6-hard")
1344                           .flag("+EL")
1345                           .flag("-msoft-float")
1346                           .flag("+mmicromips");
1347    auto ElMicroSoft = makeMultilib("/micromipsel-r6-soft")
1348                           .flag("+EL")
1349                           .flag("+msoft-float")
1350                           .flag("+mmicromips");
1351
1352    auto O32 =
1353        makeMultilib("/lib").osSuffix("").flag("-mabi=n32").flag("-mabi=n64");
1354    auto N32 =
1355        makeMultilib("/lib32").osSuffix("").flag("+mabi=n32").flag("-mabi=n64");
1356    auto N64 =
1357        makeMultilib("/lib64").osSuffix("").flag("-mabi=n32").flag("+mabi=n64");
1358
1359    ImgMultilibsV2 =
1360        MultilibSet()
1361            .Either({BeHard, BeSoft, ElHard, ElSoft, BeMicroHard, BeMicroSoft,
1362                     ElMicroHard, ElMicroSoft})
1363            .Either(O32, N32, N64)
1364            .FilterOut(NonExistent)
1365            .setIncludeDirsCallback([](const Multilib &M) {
1366              return std::vector<std::string>({"/../../../../sysroot" +
1367                                               M.includeSuffix() +
1368                                               "/../usr/include"});
1369            })
1370            .setFilePathsCallback([](const Multilib &M) {
1371              return std::vector<std::string>(
1372                  {"/../../../../mips-img-linux-gnu/lib" + M.gccSuffix()});
1373            });
1374  }
1375  for (auto Candidate : {&ImgMultilibsV1, &ImgMultilibsV2}) {
1376    if (Candidate->select(Flags, Result.SelectedMultilib)) {
1377      Result.Multilibs = *Candidate;
1378      return true;
1379    }
1380  }
1381  return false;
1382}
1383
1384bool clang::driver::findMIPSMultilibs(const Driver &D,
1385                                      const llvm::Triple &TargetTriple,
1386                                      StringRef Path, const ArgList &Args,
1387                                      DetectedMultilibs &Result) {
1388  FilterNonExistent NonExistent(Path, "/crtbegin.o", D.getVFS());
1389
1390  StringRef CPUName;
1391  StringRef ABIName;
1392  tools::mips::getMipsCPUAndABI(Args, TargetTriple, CPUName, ABIName);
1393
1394  llvm::Triple::ArchType TargetArch = TargetTriple.getArch();
1395
1396  Multilib::flags_list Flags;
1397  addMultilibFlag(TargetTriple.isMIPS32(), "m32", Flags);
1398  addMultilibFlag(TargetTriple.isMIPS64(), "m64", Flags);
1399  addMultilibFlag(isMips16(Args), "mips16", Flags);
1400  addMultilibFlag(CPUName == "mips32", "march=mips32", Flags);
1401  addMultilibFlag(CPUName == "mips32r2" || CPUName == "mips32r3" ||
1402                      CPUName == "mips32r5" || CPUName == "p5600",
1403                  "march=mips32r2", Flags);
1404  addMultilibFlag(CPUName == "mips32r6", "march=mips32r6", Flags);
1405  addMultilibFlag(CPUName == "mips64", "march=mips64", Flags);
1406  addMultilibFlag(CPUName == "mips64r2" || CPUName == "mips64r3" ||
1407                      CPUName == "mips64r5" || CPUName == "octeon" ||
1408                      CPUName == "octeon+",
1409                  "march=mips64r2", Flags);
1410  addMultilibFlag(CPUName == "mips64r6", "march=mips64r6", Flags);
1411  addMultilibFlag(isMicroMips(Args), "mmicromips", Flags);
1412  addMultilibFlag(tools::mips::isUCLibc(Args), "muclibc", Flags);
1413  addMultilibFlag(tools::mips::isNaN2008(Args, TargetTriple), "mnan=2008",
1414                  Flags);
1415  addMultilibFlag(ABIName == "n32", "mabi=n32", Flags);
1416  addMultilibFlag(ABIName == "n64", "mabi=n64", Flags);
1417  addMultilibFlag(isSoftFloatABI(Args), "msoft-float", Flags);
1418  addMultilibFlag(!isSoftFloatABI(Args), "mhard-float", Flags);
1419  addMultilibFlag(isMipsEL(TargetArch), "EL", Flags);
1420  addMultilibFlag(!isMipsEL(TargetArch), "EB", Flags);
1421
1422  if (TargetTriple.isAndroid())
1423    return findMipsAndroidMultilibs(D.getVFS(), Path, Flags, NonExistent,
1424                                    Result);
1425
1426  if (TargetTriple.getVendor() == llvm::Triple::MipsTechnologies &&
1427      TargetTriple.getOS() == llvm::Triple::Linux &&
1428      TargetTriple.getEnvironment() == llvm::Triple::UnknownEnvironment)
1429    return findMipsMuslMultilibs(Flags, NonExistent, Result);
1430
1431  if (TargetTriple.getVendor() == llvm::Triple::MipsTechnologies &&
1432      TargetTriple.getOS() == llvm::Triple::Linux &&
1433      TargetTriple.isGNUEnvironment())
1434    return findMipsMtiMultilibs(Flags, NonExistent, Result);
1435
1436  if (TargetTriple.getVendor() == llvm::Triple::ImaginationTechnologies &&
1437      TargetTriple.getOS() == llvm::Triple::Linux &&
1438      TargetTriple.isGNUEnvironment())
1439    return findMipsImgMultilibs(Flags, NonExistent, Result);
1440
1441  if (findMipsCsMultilibs(Flags, NonExistent, Result))
1442    return true;
1443
1444  // Fallback to the regular toolchain-tree structure.
1445  Multilib Default;
1446  Result.Multilibs.push_back(Default);
1447  Result.Multilibs.FilterOut(NonExistent);
1448
1449  if (Result.Multilibs.select(Flags, Result.SelectedMultilib)) {
1450    Result.BiarchSibling = Multilib();
1451    return true;
1452  }
1453
1454  return false;
1455}
1456
1457static void findAndroidArmMultilibs(const Driver &D,
1458                                    const llvm::Triple &TargetTriple,
1459                                    StringRef Path, const ArgList &Args,
1460                                    DetectedMultilibs &Result) {
1461  // Find multilibs with subdirectories like armv7-a, thumb, armv7-a/thumb.
1462  FilterNonExistent NonExistent(Path, "/crtbegin.o", D.getVFS());
1463  Multilib ArmV7Multilib = makeMultilib("/armv7-a")
1464                               .flag("+march=armv7-a")
1465                               .flag("-mthumb");
1466  Multilib ThumbMultilib = makeMultilib("/thumb")
1467                               .flag("-march=armv7-a")
1468                               .flag("+mthumb");
1469  Multilib ArmV7ThumbMultilib = makeMultilib("/armv7-a/thumb")
1470                               .flag("+march=armv7-a")
1471                               .flag("+mthumb");
1472  Multilib DefaultMultilib = makeMultilib("")
1473                               .flag("-march=armv7-a")
1474                               .flag("-mthumb");
1475  MultilibSet AndroidArmMultilibs =
1476      MultilibSet()
1477          .Either(ThumbMultilib, ArmV7Multilib,
1478                  ArmV7ThumbMultilib, DefaultMultilib)
1479          .FilterOut(NonExistent);
1480
1481  Multilib::flags_list Flags;
1482  llvm::StringRef Arch = Args.getLastArgValue(options::OPT_march_EQ);
1483  bool IsArmArch = TargetTriple.getArch() == llvm::Triple::arm;
1484  bool IsThumbArch = TargetTriple.getArch() == llvm::Triple::thumb;
1485  bool IsV7SubArch = TargetTriple.getSubArch() == llvm::Triple::ARMSubArch_v7;
1486  bool IsThumbMode = IsThumbArch ||
1487      Args.hasFlag(options::OPT_mthumb, options::OPT_mno_thumb, false) ||
1488      (IsArmArch && llvm::ARM::parseArchISA(Arch) == llvm::ARM::ISAKind::THUMB);
1489  bool IsArmV7Mode = (IsArmArch || IsThumbArch) &&
1490      (llvm::ARM::parseArchVersion(Arch) == 7 ||
1491       (IsArmArch && Arch == "" && IsV7SubArch));
1492  addMultilibFlag(IsArmV7Mode, "march=armv7-a", Flags);
1493  addMultilibFlag(IsThumbMode, "mthumb", Flags);
1494
1495  if (AndroidArmMultilibs.select(Flags, Result.SelectedMultilib))
1496    Result.Multilibs = AndroidArmMultilibs;
1497}
1498
1499static bool findMSP430Multilibs(const Driver &D,
1500                                const llvm::Triple &TargetTriple,
1501                                StringRef Path, const ArgList &Args,
1502                                DetectedMultilibs &Result) {
1503  FilterNonExistent NonExistent(Path, "/crtbegin.o", D.getVFS());
1504  Multilib MSP430Multilib = makeMultilib("/430");
1505  // FIXME: when clang starts to support msp430x ISA additional logic
1506  // to select between multilib must be implemented
1507  // Multilib MSP430xMultilib = makeMultilib("/large");
1508
1509  Result.Multilibs.push_back(MSP430Multilib);
1510  Result.Multilibs.FilterOut(NonExistent);
1511
1512  Multilib::flags_list Flags;
1513  if (Result.Multilibs.select(Flags, Result.SelectedMultilib))
1514    return true;
1515
1516  return false;
1517}
1518
1519static void findRISCVBareMetalMultilibs(const Driver &D,
1520                                        const llvm::Triple &TargetTriple,
1521                                        StringRef Path, const ArgList &Args,
1522                                        DetectedMultilibs &Result) {
1523  FilterNonExistent NonExistent(Path, "/crtbegin.o", D.getVFS());
1524  struct RiscvMultilib {
1525    StringRef march;
1526    StringRef mabi;
1527  };
1528  // currently only support the set of multilibs like riscv-gnu-toolchain does.
1529  // TODO: support MULTILIB_REUSE
1530  SmallVector<RiscvMultilib, 8> RISCVMultilibSet = {
1531      {"rv32i", "ilp32"},     {"rv32im", "ilp32"},     {"rv32iac", "ilp32"},
1532      {"rv32imac", "ilp32"},  {"rv32imafc", "ilp32f"}, {"rv64imac", "lp64"},
1533      {"rv64imafdc", "lp64d"}};
1534
1535  std::vector<Multilib> Ms;
1536  for (auto Element : RISCVMultilibSet) {
1537    // multilib path rule is ${march}/${mabi}
1538    Ms.emplace_back(
1539        makeMultilib((Twine(Element.march) + "/" + Twine(Element.mabi)).str())
1540            .flag(Twine("+march=", Element.march).str())
1541            .flag(Twine("+mabi=", Element.mabi).str()));
1542  }
1543  MultilibSet RISCVMultilibs =
1544      MultilibSet()
1545          .Either(ArrayRef<Multilib>(Ms))
1546          .FilterOut(NonExistent)
1547          .setFilePathsCallback([](const Multilib &M) {
1548            return std::vector<std::string>(
1549                {M.gccSuffix(),
1550                 "/../../../../riscv64-unknown-elf/lib" + M.gccSuffix(),
1551                 "/../../../../riscv32-unknown-elf/lib" + M.gccSuffix()});
1552          });
1553
1554
1555  Multilib::flags_list Flags;
1556  llvm::StringSet<> Added_ABIs;
1557  StringRef ABIName = tools::riscv::getRISCVABI(Args, TargetTriple);
1558  StringRef MArch = tools::riscv::getRISCVArch(Args, TargetTriple);
1559  for (auto Element : RISCVMultilibSet) {
1560    addMultilibFlag(MArch == Element.march,
1561                    Twine("march=", Element.march).str().c_str(), Flags);
1562    if (!Added_ABIs.count(Element.mabi)) {
1563      Added_ABIs.insert(Element.mabi);
1564      addMultilibFlag(ABIName == Element.mabi,
1565                      Twine("mabi=", Element.mabi).str().c_str(), Flags);
1566    }
1567  }
1568
1569  if (RISCVMultilibs.select(Flags, Result.SelectedMultilib))
1570    Result.Multilibs = RISCVMultilibs;
1571}
1572
1573static void findRISCVMultilibs(const Driver &D,
1574                               const llvm::Triple &TargetTriple, StringRef Path,
1575                               const ArgList &Args, DetectedMultilibs &Result) {
1576  if (TargetTriple.getOS() == llvm::Triple::UnknownOS)
1577    return findRISCVBareMetalMultilibs(D, TargetTriple, Path, Args, Result);
1578
1579  FilterNonExistent NonExistent(Path, "/crtbegin.o", D.getVFS());
1580  Multilib Ilp32 = makeMultilib("lib32/ilp32").flag("+m32").flag("+mabi=ilp32");
1581  Multilib Ilp32f =
1582      makeMultilib("lib32/ilp32f").flag("+m32").flag("+mabi=ilp32f");
1583  Multilib Ilp32d =
1584      makeMultilib("lib32/ilp32d").flag("+m32").flag("+mabi=ilp32d");
1585  Multilib Lp64 = makeMultilib("lib64/lp64").flag("+m64").flag("+mabi=lp64");
1586  Multilib Lp64f = makeMultilib("lib64/lp64f").flag("+m64").flag("+mabi=lp64f");
1587  Multilib Lp64d = makeMultilib("lib64/lp64d").flag("+m64").flag("+mabi=lp64d");
1588  MultilibSet RISCVMultilibs =
1589      MultilibSet()
1590          .Either({Ilp32, Ilp32f, Ilp32d, Lp64, Lp64f, Lp64d})
1591          .FilterOut(NonExistent);
1592
1593  Multilib::flags_list Flags;
1594  bool IsRV64 = TargetTriple.getArch() == llvm::Triple::riscv64;
1595  StringRef ABIName = tools::riscv::getRISCVABI(Args, TargetTriple);
1596
1597  addMultilibFlag(!IsRV64, "m32", Flags);
1598  addMultilibFlag(IsRV64, "m64", Flags);
1599  addMultilibFlag(ABIName == "ilp32", "mabi=ilp32", Flags);
1600  addMultilibFlag(ABIName == "ilp32f", "mabi=ilp32f", Flags);
1601  addMultilibFlag(ABIName == "ilp32d", "mabi=ilp32d", Flags);
1602  addMultilibFlag(ABIName == "lp64", "mabi=lp64", Flags);
1603  addMultilibFlag(ABIName == "lp64f", "mabi=lp64f", Flags);
1604  addMultilibFlag(ABIName == "lp64d", "mabi=lp64d", Flags);
1605
1606  if (RISCVMultilibs.select(Flags, Result.SelectedMultilib))
1607    Result.Multilibs = RISCVMultilibs;
1608}
1609
1610static bool findBiarchMultilibs(const Driver &D,
1611                                const llvm::Triple &TargetTriple,
1612                                StringRef Path, const ArgList &Args,
1613                                bool NeedsBiarchSuffix,
1614                                DetectedMultilibs &Result) {
1615  Multilib Default;
1616
1617  // Some versions of SUSE and Fedora on ppc64 put 32-bit libs
1618  // in what would normally be GCCInstallPath and put the 64-bit
1619  // libs in a subdirectory named 64. The simple logic we follow is that
1620  // *if* there is a subdirectory of the right name with crtbegin.o in it,
1621  // we use that. If not, and if not a biarch triple alias, we look for
1622  // crtbegin.o without the subdirectory.
1623
1624  StringRef Suff64 = "/64";
1625  // Solaris uses platform-specific suffixes instead of /64.
1626  if (TargetTriple.getOS() == llvm::Triple::Solaris) {
1627    switch (TargetTriple.getArch()) {
1628    case llvm::Triple::x86:
1629    case llvm::Triple::x86_64:
1630      Suff64 = "/amd64";
1631      break;
1632    case llvm::Triple::sparc:
1633    case llvm::Triple::sparcv9:
1634      Suff64 = "/sparcv9";
1635      break;
1636    default:
1637      break;
1638    }
1639  }
1640
1641  Multilib Alt64 = Multilib()
1642                       .gccSuffix(Suff64)
1643                       .includeSuffix(Suff64)
1644                       .flag("-m32")
1645                       .flag("+m64")
1646                       .flag("-mx32");
1647  Multilib Alt32 = Multilib()
1648                       .gccSuffix("/32")
1649                       .includeSuffix("/32")
1650                       .flag("+m32")
1651                       .flag("-m64")
1652                       .flag("-mx32");
1653  Multilib Altx32 = Multilib()
1654                        .gccSuffix("/x32")
1655                        .includeSuffix("/x32")
1656                        .flag("-m32")
1657                        .flag("-m64")
1658                        .flag("+mx32");
1659
1660  // GCC toolchain for IAMCU doesn't have crtbegin.o, so look for libgcc.a.
1661  FilterNonExistent NonExistent(
1662      Path, TargetTriple.isOSIAMCU() ? "/libgcc.a" : "/crtbegin.o", D.getVFS());
1663
1664  // Determine default multilib from: 32, 64, x32
1665  // Also handle cases such as 64 on 32, 32 on 64, etc.
1666  enum { UNKNOWN, WANT32, WANT64, WANTX32 } Want = UNKNOWN;
1667  const bool IsX32 = TargetTriple.getEnvironment() == llvm::Triple::GNUX32;
1668  if (TargetTriple.isArch32Bit() && !NonExistent(Alt32))
1669    Want = WANT64;
1670  else if (TargetTriple.isArch64Bit() && IsX32 && !NonExistent(Altx32))
1671    Want = WANT64;
1672  else if (TargetTriple.isArch64Bit() && !IsX32 && !NonExistent(Alt64))
1673    Want = WANT32;
1674  else {
1675    if (TargetTriple.isArch32Bit())
1676      Want = NeedsBiarchSuffix ? WANT64 : WANT32;
1677    else if (IsX32)
1678      Want = NeedsBiarchSuffix ? WANT64 : WANTX32;
1679    else
1680      Want = NeedsBiarchSuffix ? WANT32 : WANT64;
1681  }
1682
1683  if (Want == WANT32)
1684    Default.flag("+m32").flag("-m64").flag("-mx32");
1685  else if (Want == WANT64)
1686    Default.flag("-m32").flag("+m64").flag("-mx32");
1687  else if (Want == WANTX32)
1688    Default.flag("-m32").flag("-m64").flag("+mx32");
1689  else
1690    return false;
1691
1692  Result.Multilibs.push_back(Default);
1693  Result.Multilibs.push_back(Alt64);
1694  Result.Multilibs.push_back(Alt32);
1695  Result.Multilibs.push_back(Altx32);
1696
1697  Result.Multilibs.FilterOut(NonExistent);
1698
1699  Multilib::flags_list Flags;
1700  addMultilibFlag(TargetTriple.isArch64Bit() && !IsX32, "m64", Flags);
1701  addMultilibFlag(TargetTriple.isArch32Bit(), "m32", Flags);
1702  addMultilibFlag(TargetTriple.isArch64Bit() && IsX32, "mx32", Flags);
1703
1704  if (!Result.Multilibs.select(Flags, Result.SelectedMultilib))
1705    return false;
1706
1707  if (Result.SelectedMultilib == Alt64 || Result.SelectedMultilib == Alt32 ||
1708      Result.SelectedMultilib == Altx32)
1709    Result.BiarchSibling = Default;
1710
1711  return true;
1712}
1713
1714/// Generic_GCC - A tool chain using the 'gcc' command to perform
1715/// all subcommands; this relies on gcc translating the majority of
1716/// command line options.
1717
1718/// Less-than for GCCVersion, implementing a Strict Weak Ordering.
1719bool Generic_GCC::GCCVersion::isOlderThan(int RHSMajor, int RHSMinor,
1720                                          int RHSPatch,
1721                                          StringRef RHSPatchSuffix) const {
1722  if (Major != RHSMajor)
1723    return Major < RHSMajor;
1724  if (Minor != RHSMinor)
1725    return Minor < RHSMinor;
1726  if (Patch != RHSPatch) {
1727    // Note that versions without a specified patch sort higher than those with
1728    // a patch.
1729    if (RHSPatch == -1)
1730      return true;
1731    if (Patch == -1)
1732      return false;
1733
1734    // Otherwise just sort on the patch itself.
1735    return Patch < RHSPatch;
1736  }
1737  if (PatchSuffix != RHSPatchSuffix) {
1738    // Sort empty suffixes higher.
1739    if (RHSPatchSuffix.empty())
1740      return true;
1741    if (PatchSuffix.empty())
1742      return false;
1743
1744    // Provide a lexicographic sort to make this a total ordering.
1745    return PatchSuffix < RHSPatchSuffix;
1746  }
1747
1748  // The versions are equal.
1749  return false;
1750}
1751
1752/// Parse a GCCVersion object out of a string of text.
1753///
1754/// This is the primary means of forming GCCVersion objects.
1755/*static*/
1756Generic_GCC::GCCVersion Generic_GCC::GCCVersion::Parse(StringRef VersionText) {
1757  const GCCVersion BadVersion = {VersionText.str(), -1, -1, -1, "", "", ""};
1758  std::pair<StringRef, StringRef> First = VersionText.split('.');
1759  std::pair<StringRef, StringRef> Second = First.second.split('.');
1760
1761  GCCVersion GoodVersion = {VersionText.str(), -1, -1, -1, "", "", ""};
1762  if (First.first.getAsInteger(10, GoodVersion.Major) || GoodVersion.Major < 0)
1763    return BadVersion;
1764  GoodVersion.MajorStr = First.first.str();
1765  if (First.second.empty())
1766    return GoodVersion;
1767  StringRef MinorStr = Second.first;
1768  if (Second.second.empty()) {
1769    if (size_t EndNumber = MinorStr.find_first_not_of("0123456789")) {
1770      GoodVersion.PatchSuffix = MinorStr.substr(EndNumber);
1771      MinorStr = MinorStr.slice(0, EndNumber);
1772    }
1773  }
1774  if (MinorStr.getAsInteger(10, GoodVersion.Minor) || GoodVersion.Minor < 0)
1775    return BadVersion;
1776  GoodVersion.MinorStr = MinorStr.str();
1777
1778  // First look for a number prefix and parse that if present. Otherwise just
1779  // stash the entire patch string in the suffix, and leave the number
1780  // unspecified. This covers versions strings such as:
1781  //   5        (handled above)
1782  //   4.4
1783  //   4.4-patched
1784  //   4.4.0
1785  //   4.4.x
1786  //   4.4.2-rc4
1787  //   4.4.x-patched
1788  // And retains any patch number it finds.
1789  StringRef PatchText = Second.second;
1790  if (!PatchText.empty()) {
1791    if (size_t EndNumber = PatchText.find_first_not_of("0123456789")) {
1792      // Try to parse the number and any suffix.
1793      if (PatchText.slice(0, EndNumber).getAsInteger(10, GoodVersion.Patch) ||
1794          GoodVersion.Patch < 0)
1795        return BadVersion;
1796      GoodVersion.PatchSuffix = PatchText.substr(EndNumber);
1797    }
1798  }
1799
1800  return GoodVersion;
1801}
1802
1803static llvm::StringRef getGCCToolchainDir(const ArgList &Args,
1804                                          llvm::StringRef SysRoot) {
1805  const Arg *A = Args.getLastArg(clang::driver::options::OPT_gcc_toolchain);
1806  if (A)
1807    return A->getValue();
1808
1809  // If we have a SysRoot, ignore GCC_INSTALL_PREFIX.
1810  // GCC_INSTALL_PREFIX specifies the gcc installation for the default
1811  // sysroot and is likely not valid with a different sysroot.
1812  if (!SysRoot.empty())
1813    return "";
1814
1815  return GCC_INSTALL_PREFIX;
1816}
1817
1818/// Initialize a GCCInstallationDetector from the driver.
1819///
1820/// This performs all of the autodetection and sets up the various paths.
1821/// Once constructed, a GCCInstallationDetector is essentially immutable.
1822///
1823/// FIXME: We shouldn't need an explicit TargetTriple parameter here, and
1824/// should instead pull the target out of the driver. This is currently
1825/// necessary because the driver doesn't store the final version of the target
1826/// triple.
1827void Generic_GCC::GCCInstallationDetector::init(
1828    const llvm::Triple &TargetTriple, const ArgList &Args,
1829    ArrayRef<std::string> ExtraTripleAliases) {
1830  llvm::Triple BiarchVariantTriple = TargetTriple.isArch32Bit()
1831                                         ? TargetTriple.get64BitArchVariant()
1832                                         : TargetTriple.get32BitArchVariant();
1833  // The library directories which may contain GCC installations.
1834  SmallVector<StringRef, 4> CandidateLibDirs, CandidateBiarchLibDirs;
1835  // The compatible GCC triples for this particular architecture.
1836  SmallVector<StringRef, 16> CandidateTripleAliases;
1837  SmallVector<StringRef, 16> CandidateBiarchTripleAliases;
1838  CollectLibDirsAndTriples(TargetTriple, BiarchVariantTriple, CandidateLibDirs,
1839                           CandidateTripleAliases, CandidateBiarchLibDirs,
1840                           CandidateBiarchTripleAliases);
1841
1842  // Compute the set of prefixes for our search.
1843  SmallVector<std::string, 8> Prefixes(D.PrefixDirs.begin(),
1844                                       D.PrefixDirs.end());
1845
1846  StringRef GCCToolchainDir = getGCCToolchainDir(Args, D.SysRoot);
1847  if (GCCToolchainDir != "") {
1848    if (GCCToolchainDir.back() == '/')
1849      GCCToolchainDir = GCCToolchainDir.drop_back(); // remove the /
1850
1851    Prefixes.push_back(GCCToolchainDir);
1852  } else {
1853    // If we have a SysRoot, try that first.
1854    if (!D.SysRoot.empty()) {
1855      Prefixes.push_back(D.SysRoot);
1856      AddDefaultGCCPrefixes(TargetTriple, Prefixes, D.SysRoot);
1857    }
1858
1859    // Then look for gcc installed alongside clang.
1860    Prefixes.push_back(D.InstalledDir + "/..");
1861
1862    // Next, look for prefix(es) that correspond to distribution-supplied gcc
1863    // installations.
1864    if (D.SysRoot.empty()) {
1865      // Typically /usr.
1866      AddDefaultGCCPrefixes(TargetTriple, Prefixes, D.SysRoot);
1867    }
1868  }
1869
1870  // Try to respect gcc-config on Gentoo. However, do that only
1871  // if --gcc-toolchain is not provided or equal to the Gentoo install
1872  // in /usr. This avoids accidentally enforcing the system GCC version
1873  // when using a custom toolchain.
1874  if (GCCToolchainDir == "" || GCCToolchainDir == D.SysRoot + "/usr") {
1875    SmallVector<StringRef, 16> GentooTestTriples;
1876    // Try to match an exact triple as target triple first.
1877    // e.g. crossdev -S x86_64-gentoo-linux-gnu will install gcc libs for
1878    // x86_64-gentoo-linux-gnu. But "clang -target x86_64-gentoo-linux-gnu"
1879    // may pick the libraries for x86_64-pc-linux-gnu even when exact matching
1880    // triple x86_64-gentoo-linux-gnu is present.
1881    GentooTestTriples.push_back(TargetTriple.str());
1882    // Check rest of triples.
1883    GentooTestTriples.append(ExtraTripleAliases.begin(),
1884                             ExtraTripleAliases.end());
1885    GentooTestTriples.append(CandidateTripleAliases.begin(),
1886                             CandidateTripleAliases.end());
1887    if (ScanGentooConfigs(TargetTriple, Args, GentooTestTriples,
1888                          CandidateBiarchTripleAliases))
1889      return;
1890  }
1891
1892  // Loop over the various components which exist and select the best GCC
1893  // installation available. GCC installs are ranked by version number.
1894  Version = GCCVersion::Parse("0.0.0");
1895  for (const std::string &Prefix : Prefixes) {
1896    if (!D.getVFS().exists(Prefix))
1897      continue;
1898    for (StringRef Suffix : CandidateLibDirs) {
1899      const std::string LibDir = Prefix + Suffix.str();
1900      if (!D.getVFS().exists(LibDir))
1901        continue;
1902      // Try to match the exact target triple first.
1903      ScanLibDirForGCCTriple(TargetTriple, Args, LibDir, TargetTriple.str());
1904      // Try rest of possible triples.
1905      for (StringRef Candidate : ExtraTripleAliases) // Try these first.
1906        ScanLibDirForGCCTriple(TargetTriple, Args, LibDir, Candidate);
1907      for (StringRef Candidate : CandidateTripleAliases)
1908        ScanLibDirForGCCTriple(TargetTriple, Args, LibDir, Candidate);
1909    }
1910    for (StringRef Suffix : CandidateBiarchLibDirs) {
1911      const std::string LibDir = Prefix + Suffix.str();
1912      if (!D.getVFS().exists(LibDir))
1913        continue;
1914      for (StringRef Candidate : CandidateBiarchTripleAliases)
1915        ScanLibDirForGCCTriple(TargetTriple, Args, LibDir, Candidate,
1916                               /*NeedsBiarchSuffix=*/ true);
1917    }
1918  }
1919}
1920
1921void Generic_GCC::GCCInstallationDetector::print(raw_ostream &OS) const {
1922  for (const auto &InstallPath : CandidateGCCInstallPaths)
1923    OS << "Found candidate GCC installation: " << InstallPath << "\n";
1924
1925  if (!GCCInstallPath.empty())
1926    OS << "Selected GCC installation: " << GCCInstallPath << "\n";
1927
1928  for (const auto &Multilib : Multilibs)
1929    OS << "Candidate multilib: " << Multilib << "\n";
1930
1931  if (Multilibs.size() != 0 || !SelectedMultilib.isDefault())
1932    OS << "Selected multilib: " << SelectedMultilib << "\n";
1933}
1934
1935bool Generic_GCC::GCCInstallationDetector::getBiarchSibling(Multilib &M) const {
1936  if (BiarchSibling.hasValue()) {
1937    M = BiarchSibling.getValue();
1938    return true;
1939  }
1940  return false;
1941}
1942
1943void Generic_GCC::GCCInstallationDetector::AddDefaultGCCPrefixes(
1944    const llvm::Triple &TargetTriple, SmallVectorImpl<std::string> &Prefixes,
1945    StringRef SysRoot) {
1946  if (TargetTriple.getOS() == llvm::Triple::Solaris) {
1947    // Solaris is a special case.
1948    // The GCC installation is under
1949    //   /usr/gcc/<major>.<minor>/lib/gcc/<triple>/<major>.<minor>.<patch>/
1950    // so we need to find those /usr/gcc/*/lib/gcc libdirs and go with
1951    // /usr/gcc/<version> as a prefix.
1952
1953    std::string PrefixDir = SysRoot.str() + "/usr/gcc";
1954    std::error_code EC;
1955    for (llvm::vfs::directory_iterator LI = D.getVFS().dir_begin(PrefixDir, EC),
1956                                       LE;
1957         !EC && LI != LE; LI = LI.increment(EC)) {
1958      StringRef VersionText = llvm::sys::path::filename(LI->path());
1959      GCCVersion CandidateVersion = GCCVersion::Parse(VersionText);
1960
1961      // Filter out obviously bad entries.
1962      if (CandidateVersion.Major == -1 || CandidateVersion.isOlderThan(4, 1, 1))
1963        continue;
1964
1965      std::string CandidatePrefix = PrefixDir + "/" + VersionText.str();
1966      std::string CandidateLibPath = CandidatePrefix + "/lib/gcc";
1967      if (!D.getVFS().exists(CandidateLibPath))
1968        continue;
1969
1970      Prefixes.push_back(CandidatePrefix);
1971    }
1972    return;
1973  }
1974
1975  // Non-Solaris is much simpler - most systems just go with "/usr".
1976  if (SysRoot.empty() && TargetTriple.getOS() == llvm::Triple::Linux) {
1977    // Yet, still look for RHEL devtoolsets.
1978    Prefixes.push_back("/opt/rh/devtoolset-8/root/usr");
1979    Prefixes.push_back("/opt/rh/devtoolset-7/root/usr");
1980    Prefixes.push_back("/opt/rh/devtoolset-6/root/usr");
1981    Prefixes.push_back("/opt/rh/devtoolset-4/root/usr");
1982    Prefixes.push_back("/opt/rh/devtoolset-3/root/usr");
1983    Prefixes.push_back("/opt/rh/devtoolset-2/root/usr");
1984  }
1985  Prefixes.push_back(SysRoot.str() + "/usr");
1986}
1987
1988/*static*/ void Generic_GCC::GCCInstallationDetector::CollectLibDirsAndTriples(
1989    const llvm::Triple &TargetTriple, const llvm::Triple &BiarchTriple,
1990    SmallVectorImpl<StringRef> &LibDirs,
1991    SmallVectorImpl<StringRef> &TripleAliases,
1992    SmallVectorImpl<StringRef> &BiarchLibDirs,
1993    SmallVectorImpl<StringRef> &BiarchTripleAliases) {
1994  // Declare a bunch of static data sets that we'll select between below. These
1995  // are specifically designed to always refer to string literals to avoid any
1996  // lifetime or initialization issues.
1997  static const char *const AArch64LibDirs[] = {"/lib64", "/lib"};
1998  static const char *const AArch64Triples[] = {
1999      "aarch64-none-linux-gnu", "aarch64-linux-gnu", "aarch64-redhat-linux",
2000      "aarch64-suse-linux", "aarch64-linux-android"};
2001  static const char *const AArch64beLibDirs[] = {"/lib"};
2002  static const char *const AArch64beTriples[] = {"aarch64_be-none-linux-gnu",
2003                                                 "aarch64_be-linux-gnu"};
2004
2005  static const char *const ARMLibDirs[] = {"/lib"};
2006  static const char *const ARMTriples[] = {"arm-linux-gnueabi",
2007                                           "arm-linux-androideabi"};
2008  static const char *const ARMHFTriples[] = {"arm-linux-gnueabihf",
2009                                             "armv7hl-redhat-linux-gnueabi",
2010                                             "armv6hl-suse-linux-gnueabi",
2011                                             "armv7hl-suse-linux-gnueabi"};
2012  static const char *const ARMebLibDirs[] = {"/lib"};
2013  static const char *const ARMebTriples[] = {"armeb-linux-gnueabi",
2014                                             "armeb-linux-androideabi"};
2015  static const char *const ARMebHFTriples[] = {
2016      "armeb-linux-gnueabihf", "armebv7hl-redhat-linux-gnueabi"};
2017
2018  static const char *const AVRLibDirs[] = {"/lib"};
2019  static const char *const AVRTriples[] = {"avr"};
2020
2021  static const char *const X86_64LibDirs[] = {"/lib64", "/lib"};
2022  static const char *const X86_64Triples[] = {
2023      "x86_64-linux-gnu",       "x86_64-unknown-linux-gnu",
2024      "x86_64-pc-linux-gnu",    "x86_64-redhat-linux6E",
2025      "x86_64-redhat-linux",    "x86_64-suse-linux",
2026      "x86_64-manbo-linux-gnu", "x86_64-linux-gnu",
2027      "x86_64-slackware-linux", "x86_64-unknown-linux",
2028      "x86_64-amazon-linux",    "x86_64-linux-android"};
2029  static const char *const X32LibDirs[] = {"/libx32"};
2030  static const char *const X86LibDirs[] = {"/lib32", "/lib"};
2031  static const char *const X86Triples[] = {
2032      "i686-linux-gnu",       "i686-pc-linux-gnu",     "i486-linux-gnu",
2033      "i386-linux-gnu",       "i386-redhat-linux6E",   "i686-redhat-linux",
2034      "i586-redhat-linux",    "i386-redhat-linux",     "i586-suse-linux",
2035      "i486-slackware-linux", "i686-montavista-linux", "i586-linux-gnu",
2036      "i686-linux-android",   "i386-gnu",              "i486-gnu",
2037      "i586-gnu",             "i686-gnu"};
2038
2039  static const char *const MIPSLibDirs[] = {"/lib"};
2040  static const char *const MIPSTriples[] = {
2041      "mips-linux-gnu", "mips-mti-linux", "mips-mti-linux-gnu",
2042      "mips-img-linux-gnu", "mipsisa32r6-linux-gnu"};
2043  static const char *const MIPSELLibDirs[] = {"/lib"};
2044  static const char *const MIPSELTriples[] = {
2045      "mipsel-linux-gnu", "mips-img-linux-gnu", "mipsisa32r6el-linux-gnu",
2046      "mipsel-linux-android"};
2047
2048  static const char *const MIPS64LibDirs[] = {"/lib64", "/lib"};
2049  static const char *const MIPS64Triples[] = {
2050      "mips64-linux-gnu",      "mips-mti-linux-gnu",
2051      "mips-img-linux-gnu",    "mips64-linux-gnuabi64",
2052      "mipsisa64r6-linux-gnu", "mipsisa64r6-linux-gnuabi64"};
2053  static const char *const MIPS64ELLibDirs[] = {"/lib64", "/lib"};
2054  static const char *const MIPS64ELTriples[] = {
2055      "mips64el-linux-gnu",      "mips-mti-linux-gnu",
2056      "mips-img-linux-gnu",      "mips64el-linux-gnuabi64",
2057      "mipsisa64r6el-linux-gnu", "mipsisa64r6el-linux-gnuabi64",
2058      "mips64el-linux-android"};
2059
2060  static const char *const MIPSN32LibDirs[] = {"/lib32"};
2061  static const char *const MIPSN32Triples[] = {"mips64-linux-gnuabin32",
2062                                               "mipsisa64r6-linux-gnuabin32"};
2063  static const char *const MIPSN32ELLibDirs[] = {"/lib32"};
2064  static const char *const MIPSN32ELTriples[] = {
2065      "mips64el-linux-gnuabin32", "mipsisa64r6el-linux-gnuabin32"};
2066
2067  static const char *const MSP430LibDirs[] = {"/lib"};
2068  static const char *const MSP430Triples[] = {"msp430-elf"};
2069
2070  static const char *const PPCLibDirs[] = {"/lib32", "/lib"};
2071  static const char *const PPCTriples[] = {
2072      "powerpc-linux-gnu", "powerpc-unknown-linux-gnu", "powerpc-linux-gnuspe",
2073      // On 32-bit PowerPC systems running SUSE Linux, gcc is configured as a
2074      // 64-bit compiler which defaults to "-m32", hence "powerpc64-suse-linux".
2075      "powerpc64-suse-linux", "powerpc-montavista-linuxspe"};
2076  static const char *const PPC64LibDirs[] = {"/lib64", "/lib"};
2077  static const char *const PPC64Triples[] = {
2078      "powerpc64-linux-gnu", "powerpc64-unknown-linux-gnu",
2079      "powerpc64-suse-linux", "ppc64-redhat-linux"};
2080  static const char *const PPC64LELibDirs[] = {"/lib64", "/lib"};
2081  static const char *const PPC64LETriples[] = {
2082      "powerpc64le-linux-gnu", "powerpc64le-unknown-linux-gnu",
2083      "powerpc64le-suse-linux", "ppc64le-redhat-linux"};
2084
2085  static const char *const RISCV32LibDirs[] = {"/lib32", "/lib"};
2086  static const char *const RISCV32Triples[] = {"riscv32-unknown-linux-gnu",
2087                                               "riscv32-linux-gnu",
2088                                               "riscv32-unknown-elf"};
2089  static const char *const RISCV64LibDirs[] = {"/lib64", "/lib"};
2090  static const char *const RISCV64Triples[] = {"riscv64-unknown-linux-gnu",
2091                                               "riscv64-linux-gnu",
2092                                               "riscv64-unknown-elf",
2093                                               "riscv64-suse-linux"};
2094
2095  static const char *const SPARCv8LibDirs[] = {"/lib32", "/lib"};
2096  static const char *const SPARCv8Triples[] = {"sparc-linux-gnu",
2097                                               "sparcv8-linux-gnu"};
2098  static const char *const SPARCv9LibDirs[] = {"/lib64", "/lib"};
2099  static const char *const SPARCv9Triples[] = {"sparc64-linux-gnu",
2100                                               "sparcv9-linux-gnu"};
2101
2102  static const char *const SystemZLibDirs[] = {"/lib64", "/lib"};
2103  static const char *const SystemZTriples[] = {
2104      "s390x-linux-gnu", "s390x-unknown-linux-gnu", "s390x-ibm-linux-gnu",
2105      "s390x-suse-linux", "s390x-redhat-linux"};
2106
2107
2108  using std::begin;
2109  using std::end;
2110
2111  if (TargetTriple.getOS() == llvm::Triple::Solaris) {
2112    static const char *const SolarisLibDirs[] = {"/lib"};
2113    static const char *const SolarisSparcV8Triples[] = {
2114        "sparc-sun-solaris2.11", "sparc-sun-solaris2.12"};
2115    static const char *const SolarisSparcV9Triples[] = {
2116        "sparcv9-sun-solaris2.11", "sparcv9-sun-solaris2.12"};
2117    static const char *const SolarisX86Triples[] = {"i386-pc-solaris2.11",
2118                                                    "i386-pc-solaris2.12"};
2119    static const char *const SolarisX86_64Triples[] = {"x86_64-pc-solaris2.11",
2120                                                       "x86_64-pc-solaris2.12"};
2121    LibDirs.append(begin(SolarisLibDirs), end(SolarisLibDirs));
2122    BiarchLibDirs.append(begin(SolarisLibDirs), end(SolarisLibDirs));
2123    switch (TargetTriple.getArch()) {
2124    case llvm::Triple::x86:
2125      TripleAliases.append(begin(SolarisX86Triples), end(SolarisX86Triples));
2126      BiarchTripleAliases.append(begin(SolarisX86_64Triples),
2127                                 end(SolarisX86_64Triples));
2128      break;
2129    case llvm::Triple::x86_64:
2130      TripleAliases.append(begin(SolarisX86_64Triples),
2131                           end(SolarisX86_64Triples));
2132      BiarchTripleAliases.append(begin(SolarisX86Triples),
2133                                 end(SolarisX86Triples));
2134      break;
2135    case llvm::Triple::sparc:
2136      TripleAliases.append(begin(SolarisSparcV8Triples),
2137                           end(SolarisSparcV8Triples));
2138      BiarchTripleAliases.append(begin(SolarisSparcV9Triples),
2139                                 end(SolarisSparcV9Triples));
2140      break;
2141    case llvm::Triple::sparcv9:
2142      TripleAliases.append(begin(SolarisSparcV9Triples),
2143                           end(SolarisSparcV9Triples));
2144      BiarchTripleAliases.append(begin(SolarisSparcV8Triples),
2145                                 end(SolarisSparcV8Triples));
2146      break;
2147    default:
2148      break;
2149    }
2150    return;
2151  }
2152
2153  // Android targets should not use GNU/Linux tools or libraries.
2154  if (TargetTriple.isAndroid()) {
2155    static const char *const AArch64AndroidTriples[] = {
2156        "aarch64-linux-android"};
2157    static const char *const ARMAndroidTriples[] = {"arm-linux-androideabi"};
2158    static const char *const MIPSELAndroidTriples[] = {"mipsel-linux-android"};
2159    static const char *const MIPS64ELAndroidTriples[] = {
2160        "mips64el-linux-android"};
2161    static const char *const X86AndroidTriples[] = {"i686-linux-android"};
2162    static const char *const X86_64AndroidTriples[] = {"x86_64-linux-android"};
2163
2164    switch (TargetTriple.getArch()) {
2165    case llvm::Triple::aarch64:
2166      LibDirs.append(begin(AArch64LibDirs), end(AArch64LibDirs));
2167      TripleAliases.append(begin(AArch64AndroidTriples),
2168                           end(AArch64AndroidTriples));
2169      break;
2170    case llvm::Triple::arm:
2171    case llvm::Triple::thumb:
2172      LibDirs.append(begin(ARMLibDirs), end(ARMLibDirs));
2173      TripleAliases.append(begin(ARMAndroidTriples), end(ARMAndroidTriples));
2174      break;
2175    case llvm::Triple::mipsel:
2176      LibDirs.append(begin(MIPSELLibDirs), end(MIPSELLibDirs));
2177      TripleAliases.append(begin(MIPSELAndroidTriples),
2178                           end(MIPSELAndroidTriples));
2179      BiarchLibDirs.append(begin(MIPS64ELLibDirs), end(MIPS64ELLibDirs));
2180      BiarchTripleAliases.append(begin(MIPS64ELAndroidTriples),
2181                                 end(MIPS64ELAndroidTriples));
2182      break;
2183    case llvm::Triple::mips64el:
2184      LibDirs.append(begin(MIPS64ELLibDirs), end(MIPS64ELLibDirs));
2185      TripleAliases.append(begin(MIPS64ELAndroidTriples),
2186                           end(MIPS64ELAndroidTriples));
2187      BiarchLibDirs.append(begin(MIPSELLibDirs), end(MIPSELLibDirs));
2188      BiarchTripleAliases.append(begin(MIPSELAndroidTriples),
2189                                 end(MIPSELAndroidTriples));
2190      break;
2191    case llvm::Triple::x86_64:
2192      LibDirs.append(begin(X86_64LibDirs), end(X86_64LibDirs));
2193      TripleAliases.append(begin(X86_64AndroidTriples),
2194                           end(X86_64AndroidTriples));
2195      BiarchLibDirs.append(begin(X86LibDirs), end(X86LibDirs));
2196      BiarchTripleAliases.append(begin(X86AndroidTriples),
2197                                 end(X86AndroidTriples));
2198      break;
2199    case llvm::Triple::x86:
2200      LibDirs.append(begin(X86LibDirs), end(X86LibDirs));
2201      TripleAliases.append(begin(X86AndroidTriples), end(X86AndroidTriples));
2202      BiarchLibDirs.append(begin(X86_64LibDirs), end(X86_64LibDirs));
2203      BiarchTripleAliases.append(begin(X86_64AndroidTriples),
2204                                 end(X86_64AndroidTriples));
2205      break;
2206    default:
2207      break;
2208    }
2209
2210    return;
2211  }
2212
2213  switch (TargetTriple.getArch()) {
2214  case llvm::Triple::aarch64:
2215    LibDirs.append(begin(AArch64LibDirs), end(AArch64LibDirs));
2216    TripleAliases.append(begin(AArch64Triples), end(AArch64Triples));
2217    BiarchLibDirs.append(begin(AArch64LibDirs), end(AArch64LibDirs));
2218    BiarchTripleAliases.append(begin(AArch64Triples), end(AArch64Triples));
2219    break;
2220  case llvm::Triple::aarch64_be:
2221    LibDirs.append(begin(AArch64beLibDirs), end(AArch64beLibDirs));
2222    TripleAliases.append(begin(AArch64beTriples), end(AArch64beTriples));
2223    BiarchLibDirs.append(begin(AArch64beLibDirs), end(AArch64beLibDirs));
2224    BiarchTripleAliases.append(begin(AArch64beTriples), end(AArch64beTriples));
2225    break;
2226  case llvm::Triple::arm:
2227  case llvm::Triple::thumb:
2228    LibDirs.append(begin(ARMLibDirs), end(ARMLibDirs));
2229    if (TargetTriple.getEnvironment() == llvm::Triple::GNUEABIHF) {
2230      TripleAliases.append(begin(ARMHFTriples), end(ARMHFTriples));
2231    } else {
2232      TripleAliases.append(begin(ARMTriples), end(ARMTriples));
2233    }
2234    break;
2235  case llvm::Triple::armeb:
2236  case llvm::Triple::thumbeb:
2237    LibDirs.append(begin(ARMebLibDirs), end(ARMebLibDirs));
2238    if (TargetTriple.getEnvironment() == llvm::Triple::GNUEABIHF) {
2239      TripleAliases.append(begin(ARMebHFTriples), end(ARMebHFTriples));
2240    } else {
2241      TripleAliases.append(begin(ARMebTriples), end(ARMebTriples));
2242    }
2243    break;
2244  case llvm::Triple::avr:
2245    LibDirs.append(begin(AVRLibDirs), end(AVRLibDirs));
2246    TripleAliases.append(begin(AVRTriples), end(AVRTriples));
2247    break;
2248  case llvm::Triple::x86_64:
2249    LibDirs.append(begin(X86_64LibDirs), end(X86_64LibDirs));
2250    TripleAliases.append(begin(X86_64Triples), end(X86_64Triples));
2251    // x32 is always available when x86_64 is available, so adding it as
2252    // secondary arch with x86_64 triples
2253    if (TargetTriple.getEnvironment() == llvm::Triple::GNUX32) {
2254      BiarchLibDirs.append(begin(X32LibDirs), end(X32LibDirs));
2255      BiarchTripleAliases.append(begin(X86_64Triples), end(X86_64Triples));
2256    } else {
2257      BiarchLibDirs.append(begin(X86LibDirs), end(X86LibDirs));
2258      BiarchTripleAliases.append(begin(X86Triples), end(X86Triples));
2259    }
2260    break;
2261  case llvm::Triple::x86:
2262    LibDirs.append(begin(X86LibDirs), end(X86LibDirs));
2263    // MCU toolchain is 32 bit only and its triple alias is TargetTriple
2264    // itself, which will be appended below.
2265    if (!TargetTriple.isOSIAMCU()) {
2266      TripleAliases.append(begin(X86Triples), end(X86Triples));
2267      BiarchLibDirs.append(begin(X86_64LibDirs), end(X86_64LibDirs));
2268      BiarchTripleAliases.append(begin(X86_64Triples), end(X86_64Triples));
2269    }
2270    break;
2271  case llvm::Triple::mips:
2272    LibDirs.append(begin(MIPSLibDirs), end(MIPSLibDirs));
2273    TripleAliases.append(begin(MIPSTriples), end(MIPSTriples));
2274    BiarchLibDirs.append(begin(MIPS64LibDirs), end(MIPS64LibDirs));
2275    BiarchTripleAliases.append(begin(MIPS64Triples), end(MIPS64Triples));
2276    BiarchLibDirs.append(begin(MIPSN32LibDirs), end(MIPSN32LibDirs));
2277    BiarchTripleAliases.append(begin(MIPSN32Triples), end(MIPSN32Triples));
2278    break;
2279  case llvm::Triple::mipsel:
2280    LibDirs.append(begin(MIPSELLibDirs), end(MIPSELLibDirs));
2281    TripleAliases.append(begin(MIPSELTriples), end(MIPSELTriples));
2282    TripleAliases.append(begin(MIPSTriples), end(MIPSTriples));
2283    BiarchLibDirs.append(begin(MIPS64ELLibDirs), end(MIPS64ELLibDirs));
2284    BiarchTripleAliases.append(begin(MIPS64ELTriples), end(MIPS64ELTriples));
2285    BiarchLibDirs.append(begin(MIPSN32ELLibDirs), end(MIPSN32ELLibDirs));
2286    BiarchTripleAliases.append(begin(MIPSN32ELTriples), end(MIPSN32ELTriples));
2287    break;
2288  case llvm::Triple::mips64:
2289    LibDirs.append(begin(MIPS64LibDirs), end(MIPS64LibDirs));
2290    TripleAliases.append(begin(MIPS64Triples), end(MIPS64Triples));
2291    BiarchLibDirs.append(begin(MIPSLibDirs), end(MIPSLibDirs));
2292    BiarchTripleAliases.append(begin(MIPSTriples), end(MIPSTriples));
2293    BiarchLibDirs.append(begin(MIPSN32LibDirs), end(MIPSN32LibDirs));
2294    BiarchTripleAliases.append(begin(MIPSN32Triples), end(MIPSN32Triples));
2295    break;
2296  case llvm::Triple::mips64el:
2297    LibDirs.append(begin(MIPS64ELLibDirs), end(MIPS64ELLibDirs));
2298    TripleAliases.append(begin(MIPS64ELTriples), end(MIPS64ELTriples));
2299    BiarchLibDirs.append(begin(MIPSELLibDirs), end(MIPSELLibDirs));
2300    BiarchTripleAliases.append(begin(MIPSELTriples), end(MIPSELTriples));
2301    BiarchLibDirs.append(begin(MIPSN32ELLibDirs), end(MIPSN32ELLibDirs));
2302    BiarchTripleAliases.append(begin(MIPSN32ELTriples), end(MIPSN32ELTriples));
2303    BiarchTripleAliases.append(begin(MIPSTriples), end(MIPSTriples));
2304    break;
2305  case llvm::Triple::msp430:
2306    LibDirs.append(begin(MSP430LibDirs), end(MSP430LibDirs));
2307    TripleAliases.append(begin(MSP430Triples), end(MSP430Triples));
2308    break;
2309  case llvm::Triple::ppc:
2310    LibDirs.append(begin(PPCLibDirs), end(PPCLibDirs));
2311    TripleAliases.append(begin(PPCTriples), end(PPCTriples));
2312    BiarchLibDirs.append(begin(PPC64LibDirs), end(PPC64LibDirs));
2313    BiarchTripleAliases.append(begin(PPC64Triples), end(PPC64Triples));
2314    break;
2315  case llvm::Triple::ppc64:
2316    LibDirs.append(begin(PPC64LibDirs), end(PPC64LibDirs));
2317    TripleAliases.append(begin(PPC64Triples), end(PPC64Triples));
2318    BiarchLibDirs.append(begin(PPCLibDirs), end(PPCLibDirs));
2319    BiarchTripleAliases.append(begin(PPCTriples), end(PPCTriples));
2320    break;
2321  case llvm::Triple::ppc64le:
2322    LibDirs.append(begin(PPC64LELibDirs), end(PPC64LELibDirs));
2323    TripleAliases.append(begin(PPC64LETriples), end(PPC64LETriples));
2324    break;
2325  case llvm::Triple::riscv32:
2326    LibDirs.append(begin(RISCV32LibDirs), end(RISCV32LibDirs));
2327    TripleAliases.append(begin(RISCV32Triples), end(RISCV32Triples));
2328    BiarchLibDirs.append(begin(RISCV64LibDirs), end(RISCV64LibDirs));
2329    BiarchTripleAliases.append(begin(RISCV64Triples), end(RISCV64Triples));
2330    break;
2331  case llvm::Triple::riscv64:
2332    LibDirs.append(begin(RISCV64LibDirs), end(RISCV64LibDirs));
2333    TripleAliases.append(begin(RISCV64Triples), end(RISCV64Triples));
2334    BiarchLibDirs.append(begin(RISCV32LibDirs), end(RISCV32LibDirs));
2335    BiarchTripleAliases.append(begin(RISCV32Triples), end(RISCV32Triples));
2336    break;
2337  case llvm::Triple::sparc:
2338  case llvm::Triple::sparcel:
2339    LibDirs.append(begin(SPARCv8LibDirs), end(SPARCv8LibDirs));
2340    TripleAliases.append(begin(SPARCv8Triples), end(SPARCv8Triples));
2341    BiarchLibDirs.append(begin(SPARCv9LibDirs), end(SPARCv9LibDirs));
2342    BiarchTripleAliases.append(begin(SPARCv9Triples), end(SPARCv9Triples));
2343    break;
2344  case llvm::Triple::sparcv9:
2345    LibDirs.append(begin(SPARCv9LibDirs), end(SPARCv9LibDirs));
2346    TripleAliases.append(begin(SPARCv9Triples), end(SPARCv9Triples));
2347    BiarchLibDirs.append(begin(SPARCv8LibDirs), end(SPARCv8LibDirs));
2348    BiarchTripleAliases.append(begin(SPARCv8Triples), end(SPARCv8Triples));
2349    break;
2350  case llvm::Triple::systemz:
2351    LibDirs.append(begin(SystemZLibDirs), end(SystemZLibDirs));
2352    TripleAliases.append(begin(SystemZTriples), end(SystemZTriples));
2353    break;
2354  default:
2355    // By default, just rely on the standard lib directories and the original
2356    // triple.
2357    break;
2358  }
2359
2360  // Always append the drivers target triple to the end, in case it doesn't
2361  // match any of our aliases.
2362  TripleAliases.push_back(TargetTriple.str());
2363
2364  // Also include the multiarch variant if it's different.
2365  if (TargetTriple.str() != BiarchTriple.str())
2366    BiarchTripleAliases.push_back(BiarchTriple.str());
2367}
2368
2369bool Generic_GCC::GCCInstallationDetector::ScanGCCForMultilibs(
2370    const llvm::Triple &TargetTriple, const ArgList &Args,
2371    StringRef Path, bool NeedsBiarchSuffix) {
2372  llvm::Triple::ArchType TargetArch = TargetTriple.getArch();
2373  DetectedMultilibs Detected;
2374
2375  // Android standalone toolchain could have multilibs for ARM and Thumb.
2376  // Debian mips multilibs behave more like the rest of the biarch ones,
2377  // so handle them there
2378  if (isArmOrThumbArch(TargetArch) && TargetTriple.isAndroid()) {
2379    // It should also work without multilibs in a simplified toolchain.
2380    findAndroidArmMultilibs(D, TargetTriple, Path, Args, Detected);
2381  } else if (TargetTriple.isMIPS()) {
2382    if (!findMIPSMultilibs(D, TargetTriple, Path, Args, Detected))
2383      return false;
2384  } else if (TargetTriple.isRISCV()) {
2385    findRISCVMultilibs(D, TargetTriple, Path, Args, Detected);
2386  } else if (isMSP430(TargetArch)) {
2387    findMSP430Multilibs(D, TargetTriple, Path, Args, Detected);
2388  } else if (TargetArch == llvm::Triple::avr) {
2389    // AVR has no multilibs.
2390  } else if (!findBiarchMultilibs(D, TargetTriple, Path, Args,
2391                                  NeedsBiarchSuffix, Detected)) {
2392    return false;
2393  }
2394
2395  Multilibs = Detected.Multilibs;
2396  SelectedMultilib = Detected.SelectedMultilib;
2397  BiarchSibling = Detected.BiarchSibling;
2398
2399  return true;
2400}
2401
2402void Generic_GCC::GCCInstallationDetector::ScanLibDirForGCCTriple(
2403    const llvm::Triple &TargetTriple, const ArgList &Args,
2404    const std::string &LibDir, StringRef CandidateTriple,
2405    bool NeedsBiarchSuffix) {
2406  llvm::Triple::ArchType TargetArch = TargetTriple.getArch();
2407  // Locations relative to the system lib directory where GCC's triple-specific
2408  // directories might reside.
2409  struct GCCLibSuffix {
2410    // Path from system lib directory to GCC triple-specific directory.
2411    std::string LibSuffix;
2412    // Path from GCC triple-specific directory back to system lib directory.
2413    // This is one '..' component per component in LibSuffix.
2414    StringRef ReversePath;
2415    // Whether this library suffix is relevant for the triple.
2416    bool Active;
2417  } Suffixes[] = {
2418      // This is the normal place.
2419      {"gcc/" + CandidateTriple.str(), "../..", true},
2420
2421      // Debian puts cross-compilers in gcc-cross.
2422      {"gcc-cross/" + CandidateTriple.str(), "../..",
2423       TargetTriple.getOS() != llvm::Triple::Solaris},
2424
2425      // The Freescale PPC SDK has the gcc libraries in
2426      // <sysroot>/usr/lib/<triple>/x.y.z so have a look there as well. Only do
2427      // this on Freescale triples, though, since some systems put a *lot* of
2428      // files in that location, not just GCC installation data.
2429      {CandidateTriple.str(), "..",
2430       TargetTriple.getVendor() == llvm::Triple::Freescale ||
2431       TargetTriple.getVendor() == llvm::Triple::OpenEmbedded},
2432
2433      // Natively multiarch systems sometimes put the GCC triple-specific
2434      // directory within their multiarch lib directory, resulting in the
2435      // triple appearing twice.
2436      {CandidateTriple.str() + "/gcc/" + CandidateTriple.str(), "../../..",
2437       TargetTriple.getOS() != llvm::Triple::Solaris},
2438
2439      // Deal with cases (on Ubuntu) where the system architecture could be i386
2440      // but the GCC target architecture could be (say) i686.
2441      // FIXME: It may be worthwhile to generalize this and look for a second
2442      // triple.
2443      {"i386-linux-gnu/gcc/" + CandidateTriple.str(), "../../..",
2444       (TargetArch == llvm::Triple::x86 &&
2445        TargetTriple.getOS() != llvm::Triple::Solaris)},
2446      {"i386-gnu/gcc/" + CandidateTriple.str(), "../../..",
2447       (TargetArch == llvm::Triple::x86 &&
2448        TargetTriple.getOS() != llvm::Triple::Solaris)}};
2449
2450  for (auto &Suffix : Suffixes) {
2451    if (!Suffix.Active)
2452      continue;
2453
2454    StringRef LibSuffix = Suffix.LibSuffix;
2455    std::error_code EC;
2456    for (llvm::vfs::directory_iterator
2457             LI = D.getVFS().dir_begin(LibDir + "/" + LibSuffix, EC),
2458             LE;
2459         !EC && LI != LE; LI = LI.increment(EC)) {
2460      StringRef VersionText = llvm::sys::path::filename(LI->path());
2461      GCCVersion CandidateVersion = GCCVersion::Parse(VersionText);
2462      if (CandidateVersion.Major != -1) // Filter obviously bad entries.
2463        if (!CandidateGCCInstallPaths.insert(LI->path()).second)
2464          continue; // Saw this path before; no need to look at it again.
2465      if (CandidateVersion.isOlderThan(4, 1, 1))
2466        continue;
2467      if (CandidateVersion <= Version)
2468        continue;
2469
2470      if (!ScanGCCForMultilibs(TargetTriple, Args, LI->path(),
2471                               NeedsBiarchSuffix))
2472        continue;
2473
2474      Version = CandidateVersion;
2475      GCCTriple.setTriple(CandidateTriple);
2476      // FIXME: We hack together the directory name here instead of
2477      // using LI to ensure stable path separators across Windows and
2478      // Linux.
2479      GCCInstallPath = (LibDir + "/" + LibSuffix + "/" + VersionText).str();
2480      GCCParentLibPath = (GCCInstallPath + "/../" + Suffix.ReversePath).str();
2481      IsValid = true;
2482    }
2483  }
2484}
2485
2486bool Generic_GCC::GCCInstallationDetector::ScanGentooConfigs(
2487    const llvm::Triple &TargetTriple, const ArgList &Args,
2488    const SmallVectorImpl<StringRef> &CandidateTriples,
2489    const SmallVectorImpl<StringRef> &CandidateBiarchTriples) {
2490  for (StringRef CandidateTriple : CandidateTriples) {
2491    if (ScanGentooGccConfig(TargetTriple, Args, CandidateTriple))
2492      return true;
2493  }
2494
2495  for (StringRef CandidateTriple : CandidateBiarchTriples) {
2496    if (ScanGentooGccConfig(TargetTriple, Args, CandidateTriple, true))
2497      return true;
2498  }
2499  return false;
2500}
2501
2502bool Generic_GCC::GCCInstallationDetector::ScanGentooGccConfig(
2503    const llvm::Triple &TargetTriple, const ArgList &Args,
2504    StringRef CandidateTriple, bool NeedsBiarchSuffix) {
2505  llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> File =
2506      D.getVFS().getBufferForFile(D.SysRoot + "/etc/env.d/gcc/config-" +
2507                                  CandidateTriple.str());
2508  if (File) {
2509    SmallVector<StringRef, 2> Lines;
2510    File.get()->getBuffer().split(Lines, "\n");
2511    for (StringRef Line : Lines) {
2512      Line = Line.trim();
2513      // CURRENT=triple-version
2514      if (!Line.consume_front("CURRENT="))
2515        continue;
2516      // Process the config file pointed to by CURRENT.
2517      llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> ConfigFile =
2518          D.getVFS().getBufferForFile(D.SysRoot + "/etc/env.d/gcc/" +
2519                                      Line.str());
2520      std::pair<StringRef, StringRef> ActiveVersion = Line.rsplit('-');
2521      // List of paths to scan for libraries.
2522      SmallVector<StringRef, 4> GentooScanPaths;
2523      // Scan the Config file to find installed GCC libraries path.
2524      // Typical content of the GCC config file:
2525      // LDPATH="/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.x:/usr/lib/gcc/
2526      // (continued from previous line) x86_64-pc-linux-gnu/4.9.x/32"
2527      // MANPATH="/usr/share/gcc-data/x86_64-pc-linux-gnu/4.9.x/man"
2528      // INFOPATH="/usr/share/gcc-data/x86_64-pc-linux-gnu/4.9.x/info"
2529      // STDCXX_INCDIR="/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.x/include/g++-v4"
2530      // We are looking for the paths listed in LDPATH=... .
2531      if (ConfigFile) {
2532        SmallVector<StringRef, 2> ConfigLines;
2533        ConfigFile.get()->getBuffer().split(ConfigLines, "\n");
2534        for (StringRef ConfLine : ConfigLines) {
2535          ConfLine = ConfLine.trim();
2536          if (ConfLine.consume_front("LDPATH=")) {
2537            // Drop '"' from front and back if present.
2538            ConfLine.consume_back("\"");
2539            ConfLine.consume_front("\"");
2540            // Get all paths sperated by ':'
2541            ConfLine.split(GentooScanPaths, ':', -1, /*AllowEmpty*/ false);
2542          }
2543        }
2544      }
2545      // Test the path based on the version in /etc/env.d/gcc/config-{tuple}.
2546      std::string basePath = "/usr/lib/gcc/" + ActiveVersion.first.str() + "/"
2547          + ActiveVersion.second.str();
2548      GentooScanPaths.push_back(StringRef(basePath));
2549
2550      // Scan all paths for GCC libraries.
2551      for (const auto &GentooScanPath : GentooScanPaths) {
2552        std::string GentooPath = D.SysRoot + std::string(GentooScanPath);
2553        if (D.getVFS().exists(GentooPath + "/crtbegin.o")) {
2554          if (!ScanGCCForMultilibs(TargetTriple, Args, GentooPath,
2555                                   NeedsBiarchSuffix))
2556            continue;
2557
2558          Version = GCCVersion::Parse(ActiveVersion.second);
2559          GCCInstallPath = GentooPath;
2560          GCCParentLibPath = GentooPath + std::string("/../../..");
2561          GCCTriple.setTriple(ActiveVersion.first);
2562          IsValid = true;
2563          return true;
2564        }
2565      }
2566    }
2567  }
2568
2569  return false;
2570}
2571
2572Generic_GCC::Generic_GCC(const Driver &D, const llvm::Triple &Triple,
2573                         const ArgList &Args)
2574    : ToolChain(D, Triple, Args), GCCInstallation(D),
2575      CudaInstallation(D, Triple, Args) {
2576  getProgramPaths().push_back(getDriver().getInstalledDir());
2577  if (getDriver().getInstalledDir() != getDriver().Dir)
2578    getProgramPaths().push_back(getDriver().Dir);
2579}
2580
2581Generic_GCC::~Generic_GCC() {}
2582
2583Tool *Generic_GCC::getTool(Action::ActionClass AC) const {
2584  switch (AC) {
2585  case Action::PreprocessJobClass:
2586    if (!Preprocess)
2587      Preprocess.reset(new clang::driver::tools::gcc::Preprocessor(*this));
2588    return Preprocess.get();
2589  case Action::CompileJobClass:
2590    if (!Compile)
2591      Compile.reset(new tools::gcc::Compiler(*this));
2592    return Compile.get();
2593  default:
2594    return ToolChain::getTool(AC);
2595  }
2596}
2597
2598Tool *Generic_GCC::buildAssembler() const {
2599  return new tools::gnutools::Assembler(*this);
2600}
2601
2602Tool *Generic_GCC::buildLinker() const { return new tools::gcc::Linker(*this); }
2603
2604void Generic_GCC::printVerboseInfo(raw_ostream &OS) const {
2605  // Print the information about how we detected the GCC installation.
2606  GCCInstallation.print(OS);
2607  CudaInstallation.print(OS);
2608}
2609
2610bool Generic_GCC::IsUnwindTablesDefault(const ArgList &Args) const {
2611  return getArch() == llvm::Triple::x86_64;
2612}
2613
2614bool Generic_GCC::isPICDefault() const {
2615  switch (getArch()) {
2616  case llvm::Triple::x86_64:
2617    return getTriple().isOSWindows();
2618  case llvm::Triple::mips64:
2619  case llvm::Triple::mips64el:
2620    return true;
2621  default:
2622    return false;
2623  }
2624}
2625
2626bool Generic_GCC::isPIEDefault() const { return false; }
2627
2628bool Generic_GCC::isPICDefaultForced() const {
2629  return getArch() == llvm::Triple::x86_64 && getTriple().isOSWindows();
2630}
2631
2632bool Generic_GCC::IsIntegratedAssemblerDefault() const {
2633  switch (getTriple().getArch()) {
2634  case llvm::Triple::x86:
2635  case llvm::Triple::x86_64:
2636  case llvm::Triple::aarch64:
2637  case llvm::Triple::aarch64_be:
2638  case llvm::Triple::arm:
2639  case llvm::Triple::armeb:
2640  case llvm::Triple::avr:
2641  case llvm::Triple::bpfel:
2642  case llvm::Triple::bpfeb:
2643  case llvm::Triple::thumb:
2644  case llvm::Triple::thumbeb:
2645  case llvm::Triple::ppc:
2646  case llvm::Triple::ppc64:
2647  case llvm::Triple::ppc64le:
2648  case llvm::Triple::riscv32:
2649  case llvm::Triple::riscv64:
2650  case llvm::Triple::systemz:
2651  case llvm::Triple::mips:
2652  case llvm::Triple::mipsel:
2653  case llvm::Triple::mips64:
2654  case llvm::Triple::mips64el:
2655  case llvm::Triple::msp430:
2656    return true;
2657  case llvm::Triple::sparc:
2658  case llvm::Triple::sparcel:
2659  case llvm::Triple::sparcv9:
2660    if (getTriple().isOSFreeBSD() || getTriple().isOSOpenBSD() ||
2661        getTriple().isOSSolaris())
2662      return true;
2663    return false;
2664  default:
2665    return false;
2666  }
2667}
2668
2669void Generic_GCC::AddClangCXXStdlibIncludeArgs(const ArgList &DriverArgs,
2670                                               ArgStringList &CC1Args) const {
2671  if (DriverArgs.hasArg(options::OPT_nostdlibinc) ||
2672      DriverArgs.hasArg(options::OPT_nostdincxx))
2673    return;
2674
2675  switch (GetCXXStdlibType(DriverArgs)) {
2676  case ToolChain::CST_Libcxx:
2677    addLibCxxIncludePaths(DriverArgs, CC1Args);
2678    break;
2679
2680  case ToolChain::CST_Libstdcxx:
2681    addLibStdCxxIncludePaths(DriverArgs, CC1Args);
2682    break;
2683  }
2684}
2685
2686static std::string DetectLibcxxIncludePath(llvm::vfs::FileSystem &vfs,
2687                                           StringRef base) {
2688  std::error_code EC;
2689  int MaxVersion = 0;
2690  std::string MaxVersionString;
2691  for (llvm::vfs::directory_iterator LI = vfs.dir_begin(base, EC), LE;
2692       !EC && LI != LE; LI = LI.increment(EC)) {
2693    StringRef VersionText = llvm::sys::path::filename(LI->path());
2694    int Version;
2695    if (VersionText[0] == 'v' &&
2696        !VersionText.slice(1, StringRef::npos).getAsInteger(10, Version)) {
2697      if (Version > MaxVersion) {
2698        MaxVersion = Version;
2699        MaxVersionString = VersionText;
2700      }
2701    }
2702  }
2703  return MaxVersion ? (base + "/" + MaxVersionString).str() : "";
2704}
2705
2706void
2707Generic_GCC::addLibCxxIncludePaths(const llvm::opt::ArgList &DriverArgs,
2708                                   llvm::opt::ArgStringList &CC1Args) const {
2709  const std::string& SysRoot = getDriver().SysRoot;
2710  auto AddIncludePath = [&](std::string Path) {
2711    std::string IncludePath = DetectLibcxxIncludePath(getVFS(), Path);
2712    if (IncludePath.empty() || !getVFS().exists(IncludePath))
2713      return false;
2714    addSystemInclude(DriverArgs, CC1Args, IncludePath);
2715    return true;
2716  };
2717  // Android never uses the libc++ headers installed alongside the toolchain,
2718  // which are generally incompatible with the NDK libraries anyway.
2719  if (!getTriple().isAndroid())
2720    if (AddIncludePath(getDriver().Dir + "/../include/c++"))
2721      return;
2722  // If this is a development, non-installed, clang, libcxx will
2723  // not be found at ../include/c++ but it likely to be found at
2724  // one of the following two locations:
2725  if (AddIncludePath(SysRoot + "/usr/local/include/c++"))
2726    return;
2727  if (AddIncludePath(SysRoot + "/usr/include/c++"))
2728    return;
2729}
2730
2731/// Helper to add the variant paths of a libstdc++ installation.
2732bool Generic_GCC::addLibStdCXXIncludePaths(
2733    Twine Base, Twine Suffix, StringRef GCCTriple, StringRef GCCMultiarchTriple,
2734    StringRef TargetMultiarchTriple, Twine IncludeSuffix,
2735    const ArgList &DriverArgs, ArgStringList &CC1Args) const {
2736  if (!getVFS().exists(Base + Suffix))
2737    return false;
2738
2739  addSystemInclude(DriverArgs, CC1Args, Base + Suffix);
2740
2741  // The vanilla GCC layout of libstdc++ headers uses a triple subdirectory. If
2742  // that path exists or we have neither a GCC nor target multiarch triple, use
2743  // this vanilla search path.
2744  if ((GCCMultiarchTriple.empty() && TargetMultiarchTriple.empty()) ||
2745      getVFS().exists(Base + Suffix + "/" + GCCTriple + IncludeSuffix)) {
2746    addSystemInclude(DriverArgs, CC1Args,
2747                     Base + Suffix + "/" + GCCTriple + IncludeSuffix);
2748  } else {
2749    // Otherwise try to use multiarch naming schemes which have normalized the
2750    // triples and put the triple before the suffix.
2751    //
2752    // GCC surprisingly uses *both* the GCC triple with a multilib suffix and
2753    // the target triple, so we support that here.
2754    addSystemInclude(DriverArgs, CC1Args,
2755                     Base + "/" + GCCMultiarchTriple + Suffix + IncludeSuffix);
2756    addSystemInclude(DriverArgs, CC1Args,
2757                     Base + "/" + TargetMultiarchTriple + Suffix);
2758  }
2759
2760  addSystemInclude(DriverArgs, CC1Args, Base + Suffix + "/backward");
2761  return true;
2762}
2763
2764bool
2765Generic_GCC::addGCCLibStdCxxIncludePaths(const llvm::opt::ArgList &DriverArgs,
2766                                         llvm::opt::ArgStringList &CC1Args) const {
2767  // Use GCCInstallation to know where libstdc++ headers are installed.
2768  if (!GCCInstallation.isValid())
2769    return false;
2770
2771  // By default, look for the C++ headers in an include directory adjacent to
2772  // the lib directory of the GCC installation. Note that this is expect to be
2773  // equivalent to '/usr/include/c++/X.Y' in almost all cases.
2774  StringRef LibDir = GCCInstallation.getParentLibPath();
2775  StringRef InstallDir = GCCInstallation.getInstallPath();
2776  StringRef TripleStr = GCCInstallation.getTriple().str();
2777  const Multilib &Multilib = GCCInstallation.getMultilib();
2778  const std::string GCCMultiarchTriple = getMultiarchTriple(
2779      getDriver(), GCCInstallation.getTriple(), getDriver().SysRoot);
2780  const std::string TargetMultiarchTriple =
2781      getMultiarchTriple(getDriver(), getTriple(), getDriver().SysRoot);
2782  const GCCVersion &Version = GCCInstallation.getVersion();
2783
2784  // The primary search for libstdc++ supports multiarch variants.
2785  if (addLibStdCXXIncludePaths(LibDir.str() + "/../include",
2786                               "/c++/" + Version.Text, TripleStr,
2787                               GCCMultiarchTriple, TargetMultiarchTriple,
2788                               Multilib.includeSuffix(), DriverArgs, CC1Args))
2789    return true;
2790
2791  // Otherwise, fall back on a bunch of options which don't use multiarch
2792  // layouts for simplicity.
2793  const std::string LibStdCXXIncludePathCandidates[] = {
2794      // Gentoo is weird and places its headers inside the GCC install,
2795      // so if the first attempt to find the headers fails, try these patterns.
2796      InstallDir.str() + "/include/g++-v" + Version.Text,
2797      InstallDir.str() + "/include/g++-v" + Version.MajorStr + "." +
2798          Version.MinorStr,
2799      InstallDir.str() + "/include/g++-v" + Version.MajorStr,
2800  };
2801
2802  for (const auto &IncludePath : LibStdCXXIncludePathCandidates) {
2803    if (addLibStdCXXIncludePaths(IncludePath, /*Suffix*/ "", TripleStr,
2804                                 /*GCCMultiarchTriple*/ "",
2805                                 /*TargetMultiarchTriple*/ "",
2806                                 Multilib.includeSuffix(), DriverArgs, CC1Args))
2807      return true;
2808  }
2809  return false;
2810}
2811
2812void
2813Generic_GCC::addLibStdCxxIncludePaths(const llvm::opt::ArgList &DriverArgs,
2814                                      llvm::opt::ArgStringList &CC1Args) const {
2815  addGCCLibStdCxxIncludePaths(DriverArgs, CC1Args);
2816}
2817
2818llvm::opt::DerivedArgList *
2819Generic_GCC::TranslateArgs(const llvm::opt::DerivedArgList &Args, StringRef,
2820                           Action::OffloadKind DeviceOffloadKind) const {
2821
2822  // If this tool chain is used for an OpenMP offloading device we have to make
2823  // sure we always generate a shared library regardless of the commands the
2824  // user passed to the host. This is required because the runtime library
2825  // is required to load the device image dynamically at run time.
2826  if (DeviceOffloadKind == Action::OFK_OpenMP) {
2827    DerivedArgList *DAL = new DerivedArgList(Args.getBaseArgs());
2828    const OptTable &Opts = getDriver().getOpts();
2829
2830    // Request the shared library. Given that these options are decided
2831    // implicitly, they do not refer to any base argument.
2832    DAL->AddFlagArg(/*BaseArg=*/nullptr, Opts.getOption(options::OPT_shared));
2833    DAL->AddFlagArg(/*BaseArg=*/nullptr, Opts.getOption(options::OPT_fPIC));
2834
2835    // Filter all the arguments we don't care passing to the offloading
2836    // toolchain as they can mess up with the creation of a shared library.
2837    for (auto *A : Args) {
2838      switch ((options::ID)A->getOption().getID()) {
2839      default:
2840        DAL->append(A);
2841        break;
2842      case options::OPT_shared:
2843      case options::OPT_dynamic:
2844      case options::OPT_static:
2845      case options::OPT_fPIC:
2846      case options::OPT_fno_PIC:
2847      case options::OPT_fpic:
2848      case options::OPT_fno_pic:
2849      case options::OPT_fPIE:
2850      case options::OPT_fno_PIE:
2851      case options::OPT_fpie:
2852      case options::OPT_fno_pie:
2853        break;
2854      }
2855    }
2856    return DAL;
2857  }
2858  return nullptr;
2859}
2860
2861void Generic_ELF::anchor() {}
2862
2863void Generic_ELF::addClangTargetOptions(const ArgList &DriverArgs,
2864                                        ArgStringList &CC1Args,
2865                                        Action::OffloadKind) const {
2866  if (!DriverArgs.hasFlag(options::OPT_fuse_init_array,
2867                          options::OPT_fno_use_init_array, true))
2868    CC1Args.push_back("-fno-use-init-array");
2869}
2870