1 //===--- Gnu.cpp - Gnu Tool and ToolChain Implementations -------*- C++ -*-===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include "Gnu.h"
11 #include "Arch/ARM.h"
12 #include "Arch/Mips.h"
13 #include "Arch/PPC.h"
14 #include "Arch/RISCV.h"
15 #include "Arch/Sparc.h"
16 #include "Arch/SystemZ.h"
17 #include "CommonArgs.h"
18 #include "Linux.h"
19 #include "clang/Config/config.h" // for GCC_INSTALL_PREFIX
20 #include "clang/Driver/Compilation.h"
21 #include "clang/Driver/Driver.h"
22 #include "clang/Driver/DriverDiagnostic.h"
23 #include "clang/Driver/Options.h"
24 #include "clang/Driver/Tool.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 
32 using namespace clang::driver;
33 using namespace clang::driver::toolchains;
34 using namespace clang;
35 using namespace llvm::opt;
36 
37 void tools::GnuTool::anchor() {}
38 
39 static bool forwardToGCC(const Option &O) {
40   // Don't forward inputs from the original command line.  They are added from
41   // InputInfoList.
42   return O.getKind() != Option::InputClass &&
43          !O.hasFlag(options::DriverOption) && !O.hasFlag(options::LinkerInput);
44 }
45 
46 // Switch CPU names not recognized by GNU assembler to a close CPU that it does
47 // recognize, instead of a lower march from being picked in the absence of a cpu
48 // flag.
49 static void normalizeCPUNamesForAssembler(const ArgList &Args,
50                                           ArgStringList &CmdArgs) {
51   if (Arg *A = Args.getLastArg(options::OPT_mcpu_EQ)) {
52     StringRef CPUArg(A->getValue());
53     if (CPUArg.equals_lower("krait"))
54       CmdArgs.push_back("-mcpu=cortex-a15");
55     else if(CPUArg.equals_lower("kryo"))
56       CmdArgs.push_back("-mcpu=cortex-a57");
57     else
58       Args.AddLastArg(CmdArgs, options::OPT_mcpu_EQ);
59   }
60 }
61 
62 void tools::gcc::Common::ConstructJob(Compilation &C, const JobAction &JA,
63                                       const InputInfo &Output,
64                                       const InputInfoList &Inputs,
65                                       const ArgList &Args,
66                                       const char *LinkingOutput) const {
67   const Driver &D = getToolChain().getDriver();
68   ArgStringList CmdArgs;
69 
70   for (const auto &A : Args) {
71     if (forwardToGCC(A->getOption())) {
72       // It is unfortunate that we have to claim here, as this means
73       // we will basically never report anything interesting for
74       // platforms using a generic gcc, even if we are just using gcc
75       // to get to the assembler.
76       A->claim();
77 
78       // Don't forward any -g arguments to assembly steps.
79       if (isa<AssembleJobAction>(JA) &&
80           A->getOption().matches(options::OPT_g_Group))
81         continue;
82 
83       // Don't forward any -W arguments to assembly and link steps.
84       if ((isa<AssembleJobAction>(JA) || isa<LinkJobAction>(JA)) &&
85           A->getOption().matches(options::OPT_W_Group))
86         continue;
87 
88       // Don't forward -mno-unaligned-access since GCC doesn't understand
89       // it and because it doesn't affect the assembly or link steps.
90       if ((isa<AssembleJobAction>(JA) || isa<LinkJobAction>(JA)) &&
91           (A->getOption().matches(options::OPT_munaligned_access) ||
92            A->getOption().matches(options::OPT_mno_unaligned_access)))
93         continue;
94 
95       A->render(Args, CmdArgs);
96     }
97   }
98 
99   RenderExtraToolArgs(JA, CmdArgs);
100 
101   // If using a driver driver, force the arch.
102   if (getToolChain().getTriple().isOSDarwin()) {
103     CmdArgs.push_back("-arch");
104     CmdArgs.push_back(
105         Args.MakeArgString(getToolChain().getDefaultUniversalArchName()));
106   }
107 
108   // Try to force gcc to match the tool chain we want, if we recognize
109   // the arch.
110   //
111   // FIXME: The triple class should directly provide the information we want
112   // here.
113   switch (getToolChain().getArch()) {
114   default:
115     break;
116   case llvm::Triple::x86:
117   case llvm::Triple::ppc:
118     CmdArgs.push_back("-m32");
119     break;
120   case llvm::Triple::x86_64:
121   case llvm::Triple::ppc64:
122   case llvm::Triple::ppc64le:
123     CmdArgs.push_back("-m64");
124     break;
125   case llvm::Triple::sparcel:
126     CmdArgs.push_back("-EL");
127     break;
128   }
129 
130   if (Output.isFilename()) {
131     CmdArgs.push_back("-o");
132     CmdArgs.push_back(Output.getFilename());
133   } else {
134     assert(Output.isNothing() && "Unexpected output");
135     CmdArgs.push_back("-fsyntax-only");
136   }
137 
138   Args.AddAllArgValues(CmdArgs, options::OPT_Wa_COMMA, options::OPT_Xassembler);
139 
140   // Only pass -x if gcc will understand it; otherwise hope gcc
141   // understands the suffix correctly. The main use case this would go
142   // wrong in is for linker inputs if they happened to have an odd
143   // suffix; really the only way to get this to happen is a command
144   // like '-x foobar a.c' which will treat a.c like a linker input.
145   //
146   // FIXME: For the linker case specifically, can we safely convert
147   // inputs into '-Wl,' options?
148   for (const auto &II : Inputs) {
149     // Don't try to pass LLVM or AST inputs to a generic gcc.
150     if (types::isLLVMIR(II.getType()))
151       D.Diag(clang::diag::err_drv_no_linker_llvm_support)
152           << getToolChain().getTripleString();
153     else if (II.getType() == types::TY_AST)
154       D.Diag(diag::err_drv_no_ast_support) << getToolChain().getTripleString();
155     else if (II.getType() == types::TY_ModuleFile)
156       D.Diag(diag::err_drv_no_module_support)
157           << getToolChain().getTripleString();
158 
159     if (types::canTypeBeUserSpecified(II.getType())) {
160       CmdArgs.push_back("-x");
161       CmdArgs.push_back(types::getTypeName(II.getType()));
162     }
163 
164     if (II.isFilename())
165       CmdArgs.push_back(II.getFilename());
166     else {
167       const Arg &A = II.getInputArg();
168 
169       // Reverse translate some rewritten options.
170       if (A.getOption().matches(options::OPT_Z_reserved_lib_stdcxx)) {
171         CmdArgs.push_back("-lstdc++");
172         continue;
173       }
174 
175       // Don't render as input, we need gcc to do the translations.
176       A.render(Args, CmdArgs);
177     }
178   }
179 
180   const std::string &customGCCName = D.getCCCGenericGCCName();
181   const char *GCCName;
182   if (!customGCCName.empty())
183     GCCName = customGCCName.c_str();
184   else if (D.CCCIsCXX()) {
185     GCCName = "g++";
186   } else
187     GCCName = "gcc";
188 
189   const char *Exec = Args.MakeArgString(getToolChain().GetProgramPath(GCCName));
190   C.addCommand(llvm::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));
191 }
192 
193 void tools::gcc::Preprocessor::RenderExtraToolArgs(
194     const JobAction &JA, ArgStringList &CmdArgs) const {
195   CmdArgs.push_back("-E");
196 }
197 
198 void tools::gcc::Compiler::RenderExtraToolArgs(const JobAction &JA,
199                                                ArgStringList &CmdArgs) const {
200   const Driver &D = getToolChain().getDriver();
201 
202   switch (JA.getType()) {
203   // If -flto, etc. are present then make sure not to force assembly output.
204   case types::TY_LLVM_IR:
205   case types::TY_LTO_IR:
206   case types::TY_LLVM_BC:
207   case types::TY_LTO_BC:
208     CmdArgs.push_back("-c");
209     break;
210   // We assume we've got an "integrated" assembler in that gcc will produce an
211   // object file itself.
212   case types::TY_Object:
213     CmdArgs.push_back("-c");
214     break;
215   case types::TY_PP_Asm:
216     CmdArgs.push_back("-S");
217     break;
218   case types::TY_Nothing:
219     CmdArgs.push_back("-fsyntax-only");
220     break;
221   default:
222     D.Diag(diag::err_drv_invalid_gcc_output_type) << getTypeName(JA.getType());
223   }
224 }
225 
226 void tools::gcc::Linker::RenderExtraToolArgs(const JobAction &JA,
227                                              ArgStringList &CmdArgs) const {
228   // The types are (hopefully) good enough.
229 }
230 
231 // On Arm the endianness of the output file is determined by the target and
232 // can be overridden by the pseudo-target flags '-mlittle-endian'/'-EL' and
233 // '-mbig-endian'/'-EB'. Unlike other targets the flag does not result in a
234 // normalized triple so we must handle the flag here.
235 static bool isArmBigEndian(const llvm::Triple &Triple,
236                            const ArgList &Args) {
237   bool IsBigEndian = false;
238   switch (Triple.getArch()) {
239   case llvm::Triple::armeb:
240   case llvm::Triple::thumbeb:
241     IsBigEndian = true;
242     LLVM_FALLTHROUGH;
243   case llvm::Triple::arm:
244   case llvm::Triple::thumb:
245     if (Arg *A = Args.getLastArg(options::OPT_mlittle_endian,
246                                options::OPT_mbig_endian))
247       IsBigEndian = !A->getOption().matches(options::OPT_mlittle_endian);
248     break;
249   default:
250     break;
251   }
252   return IsBigEndian;
253 }
254 
255 static const char *getLDMOption(const llvm::Triple &T, const ArgList &Args) {
256   switch (T.getArch()) {
257   case llvm::Triple::x86:
258     if (T.isOSIAMCU())
259       return "elf_iamcu";
260     return "elf_i386";
261   case llvm::Triple::aarch64:
262     return "aarch64linux";
263   case llvm::Triple::aarch64_be:
264     return "aarch64linuxb";
265   case llvm::Triple::arm:
266   case llvm::Triple::thumb:
267   case llvm::Triple::armeb:
268   case llvm::Triple::thumbeb:
269     return isArmBigEndian(T, Args) ? "armelfb_linux_eabi" : "armelf_linux_eabi";
270   case llvm::Triple::ppc:
271     return "elf32ppclinux";
272   case llvm::Triple::ppc64:
273     return "elf64ppc";
274   case llvm::Triple::ppc64le:
275     return "elf64lppc";
276   case llvm::Triple::riscv32:
277     return "elf32lriscv";
278   case llvm::Triple::riscv64:
279     return "elf64lriscv";
280   case llvm::Triple::sparc:
281   case llvm::Triple::sparcel:
282     return "elf32_sparc";
283   case llvm::Triple::sparcv9:
284     return "elf64_sparc";
285   case llvm::Triple::mips:
286     return "elf32btsmip";
287   case llvm::Triple::mipsel:
288     return "elf32ltsmip";
289   case llvm::Triple::mips64:
290     if (tools::mips::hasMipsAbiArg(Args, "n32") ||
291         T.getEnvironment() == llvm::Triple::GNUABIN32)
292       return "elf32btsmipn32";
293     return "elf64btsmip";
294   case llvm::Triple::mips64el:
295     if (tools::mips::hasMipsAbiArg(Args, "n32") ||
296         T.getEnvironment() == llvm::Triple::GNUABIN32)
297       return "elf32ltsmipn32";
298     return "elf64ltsmip";
299   case llvm::Triple::systemz:
300     return "elf64_s390";
301   case llvm::Triple::x86_64:
302     if (T.getEnvironment() == llvm::Triple::GNUX32)
303       return "elf32_x86_64";
304     return "elf_x86_64";
305   default:
306     return nullptr;
307   }
308 }
309 
310 static bool getPIE(const ArgList &Args, const toolchains::Linux &ToolChain) {
311   if (Args.hasArg(options::OPT_shared) || Args.hasArg(options::OPT_static) ||
312       Args.hasArg(options::OPT_r))
313     return false;
314 
315   Arg *A = Args.getLastArg(options::OPT_pie, options::OPT_no_pie,
316                            options::OPT_nopie);
317   if (!A)
318     return ToolChain.isPIEDefault();
319   return A->getOption().matches(options::OPT_pie);
320 }
321 
322 void tools::gnutools::Linker::ConstructJob(Compilation &C, const JobAction &JA,
323                                            const InputInfo &Output,
324                                            const InputInfoList &Inputs,
325                                            const ArgList &Args,
326                                            const char *LinkingOutput) const {
327   const toolchains::Linux &ToolChain =
328       static_cast<const toolchains::Linux &>(getToolChain());
329   const Driver &D = ToolChain.getDriver();
330 
331   const llvm::Triple &Triple = getToolChain().getEffectiveTriple();
332 
333   const llvm::Triple::ArchType Arch = ToolChain.getArch();
334   const bool isAndroid = ToolChain.getTriple().isAndroid();
335   const bool IsIAMCU = ToolChain.getTriple().isOSIAMCU();
336   const bool IsPIE = getPIE(Args, ToolChain);
337   const bool HasCRTBeginEndFiles =
338       ToolChain.getTriple().hasEnvironment() ||
339       (ToolChain.getTriple().getVendor() != llvm::Triple::MipsTechnologies);
340 
341   ArgStringList CmdArgs;
342 
343   // Silence warning for "clang -g foo.o -o foo"
344   Args.ClaimAllArgs(options::OPT_g_Group);
345   // and "clang -emit-llvm foo.o -o foo"
346   Args.ClaimAllArgs(options::OPT_emit_llvm);
347   // and for "clang -w foo.o -o foo". Other warning options are already
348   // handled somewhere else.
349   Args.ClaimAllArgs(options::OPT_w);
350 
351   if (!D.SysRoot.empty())
352     CmdArgs.push_back(Args.MakeArgString("--sysroot=" + D.SysRoot));
353 
354   if (IsPIE)
355     CmdArgs.push_back("-pie");
356 
357   if (Args.hasArg(options::OPT_rdynamic))
358     CmdArgs.push_back("-export-dynamic");
359 
360   if (Args.hasArg(options::OPT_s))
361     CmdArgs.push_back("-s");
362 
363   if (Triple.isARM() || Triple.isThumb() || Triple.isAArch64()) {
364     bool IsBigEndian = isArmBigEndian(Triple, Args);
365     if (IsBigEndian)
366       arm::appendBE8LinkFlag(Args, CmdArgs, Triple);
367     IsBigEndian = IsBigEndian || Arch == llvm::Triple::aarch64_be;
368     CmdArgs.push_back(IsBigEndian ? "-EB" : "-EL");
369   }
370 
371   // Most Android ARM64 targets should enable the linker fix for erratum
372   // 843419. Only non-Cortex-A53 devices are allowed to skip this flag.
373   if (Arch == llvm::Triple::aarch64 && isAndroid) {
374     std::string CPU = getCPUName(Args, Triple);
375     if (CPU.empty() || CPU == "generic" || CPU == "cortex-a53")
376       CmdArgs.push_back("--fix-cortex-a53-843419");
377   }
378 
379   for (const auto &Opt : ToolChain.ExtraOpts)
380     CmdArgs.push_back(Opt.c_str());
381 
382   CmdArgs.push_back("--eh-frame-hdr");
383 
384   if (const char *LDMOption = getLDMOption(ToolChain.getTriple(), Args)) {
385     CmdArgs.push_back("-m");
386     CmdArgs.push_back(LDMOption);
387   } else {
388     D.Diag(diag::err_target_unknown_triple) << Triple.str();
389     return;
390   }
391 
392   if (Args.hasArg(options::OPT_static)) {
393     if (Arch == llvm::Triple::arm || Arch == llvm::Triple::armeb ||
394         Arch == llvm::Triple::thumb || Arch == llvm::Triple::thumbeb)
395       CmdArgs.push_back("-Bstatic");
396     else
397       CmdArgs.push_back("-static");
398   } else if (Args.hasArg(options::OPT_shared)) {
399     CmdArgs.push_back("-shared");
400   }
401 
402   if (!Args.hasArg(options::OPT_static)) {
403     if (Args.hasArg(options::OPT_rdynamic))
404       CmdArgs.push_back("-export-dynamic");
405 
406     if (!Args.hasArg(options::OPT_shared)) {
407       const std::string Loader =
408           D.DyldPrefix + ToolChain.getDynamicLinker(Args);
409       CmdArgs.push_back("-dynamic-linker");
410       CmdArgs.push_back(Args.MakeArgString(Loader));
411     }
412   }
413 
414   CmdArgs.push_back("-o");
415   CmdArgs.push_back(Output.getFilename());
416 
417   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles)) {
418     if (!isAndroid && !IsIAMCU) {
419       const char *crt1 = nullptr;
420       if (!Args.hasArg(options::OPT_shared)) {
421         if (Args.hasArg(options::OPT_pg))
422           crt1 = "gcrt1.o";
423         else if (IsPIE)
424           crt1 = "Scrt1.o";
425         else
426           crt1 = "crt1.o";
427       }
428       if (crt1)
429         CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crt1)));
430 
431       CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crti.o")));
432     }
433 
434     if (IsIAMCU)
435       CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crt0.o")));
436     else {
437       const char *crtbegin;
438       if (Args.hasArg(options::OPT_static))
439         crtbegin = isAndroid ? "crtbegin_static.o" : "crtbeginT.o";
440       else if (Args.hasArg(options::OPT_shared))
441         crtbegin = isAndroid ? "crtbegin_so.o" : "crtbeginS.o";
442       else if (IsPIE)
443         crtbegin = isAndroid ? "crtbegin_dynamic.o" : "crtbeginS.o";
444       else
445         crtbegin = isAndroid ? "crtbegin_dynamic.o" : "crtbegin.o";
446 
447       if (HasCRTBeginEndFiles)
448         CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtbegin)));
449     }
450 
451     // Add crtfastmath.o if available and fast math is enabled.
452     ToolChain.AddFastMathRuntimeIfAvailable(Args, CmdArgs);
453   }
454 
455   Args.AddAllArgs(CmdArgs, options::OPT_L);
456   Args.AddAllArgs(CmdArgs, options::OPT_u);
457 
458   ToolChain.AddFilePathLibArgs(Args, CmdArgs);
459 
460   if (D.isUsingLTO()) {
461     assert(!Inputs.empty() && "Must have at least one input.");
462     AddGoldPlugin(ToolChain, Args, CmdArgs, Output, Inputs[0],
463                   D.getLTOMode() == LTOK_Thin);
464   }
465 
466   if (Args.hasArg(options::OPT_Z_Xlinker__no_demangle))
467     CmdArgs.push_back("--no-demangle");
468 
469   bool NeedsSanitizerDeps = addSanitizerRuntimes(ToolChain, Args, CmdArgs);
470   bool NeedsXRayDeps = addXRayRuntime(ToolChain, Args, CmdArgs);
471   AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);
472   // The profile runtime also needs access to system libraries.
473   getToolChain().addProfileRTLibs(Args, CmdArgs);
474 
475   if (D.CCCIsCXX() &&
476       !Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
477     if (ToolChain.ShouldLinkCXXStdlib(Args)) {
478       bool OnlyLibstdcxxStatic = Args.hasArg(options::OPT_static_libstdcxx) &&
479                                  !Args.hasArg(options::OPT_static);
480       if (OnlyLibstdcxxStatic)
481         CmdArgs.push_back("-Bstatic");
482       ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
483       if (OnlyLibstdcxxStatic)
484         CmdArgs.push_back("-Bdynamic");
485     }
486     CmdArgs.push_back("-lm");
487   }
488   // Silence warnings when linking C code with a C++ '-stdlib' argument.
489   Args.ClaimAllArgs(options::OPT_stdlib_EQ);
490 
491   if (!Args.hasArg(options::OPT_nostdlib)) {
492     if (!Args.hasArg(options::OPT_nodefaultlibs)) {
493       if (Args.hasArg(options::OPT_static))
494         CmdArgs.push_back("--start-group");
495 
496       if (NeedsSanitizerDeps)
497         linkSanitizerRuntimeDeps(ToolChain, CmdArgs);
498 
499       if (NeedsXRayDeps)
500         linkXRayRuntimeDeps(ToolChain, CmdArgs);
501 
502       bool WantPthread = Args.hasArg(options::OPT_pthread) ||
503                          Args.hasArg(options::OPT_pthreads);
504 
505       // FIXME: Only pass GompNeedsRT = true for platforms with libgomp that
506       // require librt. Most modern Linux platforms do, but some may not.
507       if (addOpenMPRuntime(CmdArgs, ToolChain, Args,
508                            JA.isHostOffloading(Action::OFK_OpenMP),
509                            /* GompNeedsRT= */ true))
510         // OpenMP runtimes implies pthreads when using the GNU toolchain.
511         // FIXME: Does this really make sense for all GNU toolchains?
512         WantPthread = true;
513 
514       AddRunTimeLibs(ToolChain, D, CmdArgs, Args);
515 
516       if (WantPthread && !isAndroid)
517         CmdArgs.push_back("-lpthread");
518 
519       if (Args.hasArg(options::OPT_fsplit_stack))
520         CmdArgs.push_back("--wrap=pthread_create");
521 
522       CmdArgs.push_back("-lc");
523 
524       // Add IAMCU specific libs, if needed.
525       if (IsIAMCU)
526         CmdArgs.push_back("-lgloss");
527 
528       if (Args.hasArg(options::OPT_static))
529         CmdArgs.push_back("--end-group");
530       else
531         AddRunTimeLibs(ToolChain, D, CmdArgs, Args);
532 
533       // Add IAMCU specific libs (outside the group), if needed.
534       if (IsIAMCU) {
535         CmdArgs.push_back("--as-needed");
536         CmdArgs.push_back("-lsoftfp");
537         CmdArgs.push_back("--no-as-needed");
538       }
539     }
540 
541     if (!Args.hasArg(options::OPT_nostartfiles) && !IsIAMCU) {
542       const char *crtend;
543       if (Args.hasArg(options::OPT_shared))
544         crtend = isAndroid ? "crtend_so.o" : "crtendS.o";
545       else if (IsPIE)
546         crtend = isAndroid ? "crtend_android.o" : "crtendS.o";
547       else
548         crtend = isAndroid ? "crtend_android.o" : "crtend.o";
549 
550       if (HasCRTBeginEndFiles)
551         CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtend)));
552       if (!isAndroid)
553         CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crtn.o")));
554     }
555   }
556 
557   // Add OpenMP offloading linker script args if required.
558   AddOpenMPLinkerScript(getToolChain(), C, Output, Inputs, Args, CmdArgs, JA);
559 
560   // Add HIP offloading linker script args if required.
561   AddHIPLinkerScript(getToolChain(), C, Output, Inputs, Args, CmdArgs, JA,
562                      *this);
563 
564   const char *Exec = Args.MakeArgString(ToolChain.GetLinkerPath());
565   C.addCommand(llvm::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));
566 }
567 
568 void tools::gnutools::Assembler::ConstructJob(Compilation &C,
569                                               const JobAction &JA,
570                                               const InputInfo &Output,
571                                               const InputInfoList &Inputs,
572                                               const ArgList &Args,
573                                               const char *LinkingOutput) const {
574   const auto &D = getToolChain().getDriver();
575 
576   claimNoWarnArgs(Args);
577 
578   ArgStringList CmdArgs;
579 
580   llvm::Reloc::Model RelocationModel;
581   unsigned PICLevel;
582   bool IsPIE;
583   std::tie(RelocationModel, PICLevel, IsPIE) =
584       ParsePICArgs(getToolChain(), Args);
585 
586   if (const Arg *A = Args.getLastArg(options::OPT_gz, options::OPT_gz_EQ)) {
587     if (A->getOption().getID() == options::OPT_gz) {
588       CmdArgs.push_back("-compress-debug-sections");
589     } else {
590       StringRef Value = A->getValue();
591       if (Value == "none") {
592         CmdArgs.push_back("-compress-debug-sections=none");
593       } else if (Value == "zlib" || Value == "zlib-gnu") {
594         CmdArgs.push_back(
595             Args.MakeArgString("-compress-debug-sections=" + Twine(Value)));
596       } else {
597         D.Diag(diag::err_drv_unsupported_option_argument)
598             << A->getOption().getName() << Value;
599       }
600     }
601   }
602 
603   switch (getToolChain().getArch()) {
604   default:
605     break;
606   // Add --32/--64 to make sure we get the format we want.
607   // This is incomplete
608   case llvm::Triple::x86:
609     CmdArgs.push_back("--32");
610     break;
611   case llvm::Triple::x86_64:
612     if (getToolChain().getTriple().getEnvironment() == llvm::Triple::GNUX32)
613       CmdArgs.push_back("--x32");
614     else
615       CmdArgs.push_back("--64");
616     break;
617   case llvm::Triple::ppc: {
618     CmdArgs.push_back("-a32");
619     CmdArgs.push_back("-mppc");
620     CmdArgs.push_back(
621       ppc::getPPCAsmModeForCPU(getCPUName(Args, getToolChain().getTriple())));
622     break;
623   }
624   case llvm::Triple::ppc64: {
625     CmdArgs.push_back("-a64");
626     CmdArgs.push_back("-mppc64");
627     CmdArgs.push_back(
628       ppc::getPPCAsmModeForCPU(getCPUName(Args, getToolChain().getTriple())));
629     break;
630   }
631   case llvm::Triple::ppc64le: {
632     CmdArgs.push_back("-a64");
633     CmdArgs.push_back("-mppc64");
634     CmdArgs.push_back("-mlittle-endian");
635     CmdArgs.push_back(
636       ppc::getPPCAsmModeForCPU(getCPUName(Args, getToolChain().getTriple())));
637     break;
638   }
639   case llvm::Triple::riscv32:
640   case llvm::Triple::riscv64: {
641     StringRef ABIName = riscv::getRISCVABI(Args, getToolChain().getTriple());
642     CmdArgs.push_back("-mabi");
643     CmdArgs.push_back(ABIName.data());
644     if (const Arg *A = Args.getLastArg(options::OPT_march_EQ)) {
645       StringRef MArch = A->getValue();
646       CmdArgs.push_back("-march");
647       CmdArgs.push_back(MArch.data());
648     }
649     break;
650   }
651   case llvm::Triple::sparc:
652   case llvm::Triple::sparcel: {
653     CmdArgs.push_back("-32");
654     std::string CPU = getCPUName(Args, getToolChain().getTriple());
655     CmdArgs.push_back(sparc::getSparcAsmModeForCPU(CPU, getToolChain().getTriple()));
656     AddAssemblerKPIC(getToolChain(), Args, CmdArgs);
657     break;
658   }
659   case llvm::Triple::sparcv9: {
660     CmdArgs.push_back("-64");
661     std::string CPU = getCPUName(Args, getToolChain().getTriple());
662     CmdArgs.push_back(sparc::getSparcAsmModeForCPU(CPU, getToolChain().getTriple()));
663     AddAssemblerKPIC(getToolChain(), Args, CmdArgs);
664     break;
665   }
666   case llvm::Triple::arm:
667   case llvm::Triple::armeb:
668   case llvm::Triple::thumb:
669   case llvm::Triple::thumbeb: {
670     const llvm::Triple &Triple2 = getToolChain().getTriple();
671     CmdArgs.push_back(isArmBigEndian(Triple2, Args) ? "-EB" : "-EL");
672     switch (Triple2.getSubArch()) {
673     case llvm::Triple::ARMSubArch_v7:
674       CmdArgs.push_back("-mfpu=neon");
675       break;
676     case llvm::Triple::ARMSubArch_v8:
677       CmdArgs.push_back("-mfpu=crypto-neon-fp-armv8");
678       break;
679     default:
680       break;
681     }
682 
683     switch (arm::getARMFloatABI(getToolChain(), Args)) {
684     case arm::FloatABI::Invalid: llvm_unreachable("must have an ABI!");
685     case arm::FloatABI::Soft:
686       CmdArgs.push_back(Args.MakeArgString("-mfloat-abi=soft"));
687       break;
688     case arm::FloatABI::SoftFP:
689       CmdArgs.push_back(Args.MakeArgString("-mfloat-abi=softfp"));
690       break;
691     case arm::FloatABI::Hard:
692       CmdArgs.push_back(Args.MakeArgString("-mfloat-abi=hard"));
693       break;
694     }
695 
696     Args.AddLastArg(CmdArgs, options::OPT_march_EQ);
697     normalizeCPUNamesForAssembler(Args, CmdArgs);
698 
699     Args.AddLastArg(CmdArgs, options::OPT_mfpu_EQ);
700     break;
701   }
702   case llvm::Triple::aarch64:
703   case llvm::Triple::aarch64_be: {
704     CmdArgs.push_back(
705         getToolChain().getArch() == llvm::Triple::aarch64_be ? "-EB" : "-EL");
706     Args.AddLastArg(CmdArgs, options::OPT_march_EQ);
707     normalizeCPUNamesForAssembler(Args, CmdArgs);
708 
709     break;
710   }
711   case llvm::Triple::mips:
712   case llvm::Triple::mipsel:
713   case llvm::Triple::mips64:
714   case llvm::Triple::mips64el: {
715     StringRef CPUName;
716     StringRef ABIName;
717     mips::getMipsCPUAndABI(Args, getToolChain().getTriple(), CPUName, ABIName);
718     ABIName = mips::getGnuCompatibleMipsABIName(ABIName);
719 
720     CmdArgs.push_back("-march");
721     CmdArgs.push_back(CPUName.data());
722 
723     CmdArgs.push_back("-mabi");
724     CmdArgs.push_back(ABIName.data());
725 
726     // -mno-shared should be emitted unless -fpic, -fpie, -fPIC, -fPIE,
727     // or -mshared (not implemented) is in effect.
728     if (RelocationModel == llvm::Reloc::Static)
729       CmdArgs.push_back("-mno-shared");
730 
731     // LLVM doesn't support -mplt yet and acts as if it is always given.
732     // However, -mplt has no effect with the N64 ABI.
733     if (ABIName != "64" && !Args.hasArg(options::OPT_mno_abicalls))
734       CmdArgs.push_back("-call_nonpic");
735 
736     if (getToolChain().getTriple().isLittleEndian())
737       CmdArgs.push_back("-EL");
738     else
739       CmdArgs.push_back("-EB");
740 
741     if (Arg *A = Args.getLastArg(options::OPT_mnan_EQ)) {
742       if (StringRef(A->getValue()) == "2008")
743         CmdArgs.push_back(Args.MakeArgString("-mnan=2008"));
744     }
745 
746     // Add the last -mfp32/-mfpxx/-mfp64 or -mfpxx if it is enabled by default.
747     if (Arg *A = Args.getLastArg(options::OPT_mfp32, options::OPT_mfpxx,
748                                  options::OPT_mfp64)) {
749       A->claim();
750       A->render(Args, CmdArgs);
751     } else if (mips::shouldUseFPXX(
752                    Args, getToolChain().getTriple(), CPUName, ABIName,
753                    mips::getMipsFloatABI(getToolChain().getDriver(), Args)))
754       CmdArgs.push_back("-mfpxx");
755 
756     // Pass on -mmips16 or -mno-mips16. However, the assembler equivalent of
757     // -mno-mips16 is actually -no-mips16.
758     if (Arg *A =
759             Args.getLastArg(options::OPT_mips16, options::OPT_mno_mips16)) {
760       if (A->getOption().matches(options::OPT_mips16)) {
761         A->claim();
762         A->render(Args, CmdArgs);
763       } else {
764         A->claim();
765         CmdArgs.push_back("-no-mips16");
766       }
767     }
768 
769     Args.AddLastArg(CmdArgs, options::OPT_mmicromips,
770                     options::OPT_mno_micromips);
771     Args.AddLastArg(CmdArgs, options::OPT_mdsp, options::OPT_mno_dsp);
772     Args.AddLastArg(CmdArgs, options::OPT_mdspr2, options::OPT_mno_dspr2);
773 
774     if (Arg *A = Args.getLastArg(options::OPT_mmsa, options::OPT_mno_msa)) {
775       // Do not use AddLastArg because not all versions of MIPS assembler
776       // support -mmsa / -mno-msa options.
777       if (A->getOption().matches(options::OPT_mmsa))
778         CmdArgs.push_back(Args.MakeArgString("-mmsa"));
779     }
780 
781     Args.AddLastArg(CmdArgs, options::OPT_mhard_float,
782                     options::OPT_msoft_float);
783 
784     Args.AddLastArg(CmdArgs, options::OPT_mdouble_float,
785                     options::OPT_msingle_float);
786 
787     Args.AddLastArg(CmdArgs, options::OPT_modd_spreg,
788                     options::OPT_mno_odd_spreg);
789 
790     AddAssemblerKPIC(getToolChain(), Args, CmdArgs);
791     break;
792   }
793   case llvm::Triple::systemz: {
794     // Always pass an -march option, since our default of z10 is later
795     // than the GNU assembler's default.
796     StringRef CPUName = systemz::getSystemZTargetCPU(Args);
797     CmdArgs.push_back(Args.MakeArgString("-march=" + CPUName));
798     break;
799   }
800   }
801 
802   Args.AddAllArgs(CmdArgs, options::OPT_I);
803   Args.AddAllArgValues(CmdArgs, options::OPT_Wa_COMMA, options::OPT_Xassembler);
804 
805   CmdArgs.push_back("-o");
806   CmdArgs.push_back(Output.getFilename());
807 
808   for (const auto &II : Inputs)
809     CmdArgs.push_back(II.getFilename());
810 
811   const char *Exec = Args.MakeArgString(getToolChain().GetProgramPath("as"));
812   C.addCommand(llvm::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));
813 
814   // Handle the debug info splitting at object creation time if we're
815   // creating an object.
816   // TODO: Currently only works on linux with newer objcopy.
817   if (Args.hasArg(options::OPT_gsplit_dwarf) &&
818       getToolChain().getTriple().isOSLinux())
819     SplitDebugInfo(getToolChain(), C, *this, JA, Args, Output,
820                    SplitDebugName(Args, Inputs[0]));
821 }
822 
823 namespace {
824 // Filter to remove Multilibs that don't exist as a suffix to Path
825 class FilterNonExistent {
826   StringRef Base, File;
827   llvm::vfs::FileSystem &VFS;
828 
829 public:
830   FilterNonExistent(StringRef Base, StringRef File, llvm::vfs::FileSystem &VFS)
831       : Base(Base), File(File), VFS(VFS) {}
832   bool operator()(const Multilib &M) {
833     return !VFS.exists(Base + M.gccSuffix() + File);
834   }
835 };
836 } // end anonymous namespace
837 
838 static bool isSoftFloatABI(const ArgList &Args) {
839   Arg *A = Args.getLastArg(options::OPT_msoft_float, options::OPT_mhard_float,
840                            options::OPT_mfloat_abi_EQ);
841   if (!A)
842     return false;
843 
844   return A->getOption().matches(options::OPT_msoft_float) ||
845          (A->getOption().matches(options::OPT_mfloat_abi_EQ) &&
846           A->getValue() == StringRef("soft"));
847 }
848 
849 /// \p Flag must be a flag accepted by the driver with its leading '-' removed,
850 //     otherwise '-print-multi-lib' will not emit them correctly.
851 static void addMultilibFlag(bool Enabled, const char *const Flag,
852                             std::vector<std::string> &Flags) {
853   if (Enabled)
854     Flags.push_back(std::string("+") + Flag);
855   else
856     Flags.push_back(std::string("-") + Flag);
857 }
858 
859 static bool isArmOrThumbArch(llvm::Triple::ArchType Arch) {
860   return Arch == llvm::Triple::arm || Arch == llvm::Triple::thumb;
861 }
862 
863 static bool isMipsEL(llvm::Triple::ArchType Arch) {
864   return Arch == llvm::Triple::mipsel || Arch == llvm::Triple::mips64el;
865 }
866 
867 static bool isMips16(const ArgList &Args) {
868   Arg *A = Args.getLastArg(options::OPT_mips16, options::OPT_mno_mips16);
869   return A && A->getOption().matches(options::OPT_mips16);
870 }
871 
872 static bool isMicroMips(const ArgList &Args) {
873   Arg *A = Args.getLastArg(options::OPT_mmicromips, options::OPT_mno_micromips);
874   return A && A->getOption().matches(options::OPT_mmicromips);
875 }
876 
877 static bool isRISCV(llvm::Triple::ArchType Arch) {
878   return Arch == llvm::Triple::riscv32 || Arch == llvm::Triple::riscv64;
879 }
880 
881 static Multilib makeMultilib(StringRef commonSuffix) {
882   return Multilib(commonSuffix, commonSuffix, commonSuffix);
883 }
884 
885 static bool findMipsCsMultilibs(const Multilib::flags_list &Flags,
886                                 FilterNonExistent &NonExistent,
887                                 DetectedMultilibs &Result) {
888   // Check for Code Sourcery toolchain multilibs
889   MultilibSet CSMipsMultilibs;
890   {
891     auto MArchMips16 = makeMultilib("/mips16").flag("+m32").flag("+mips16");
892 
893     auto MArchMicroMips =
894         makeMultilib("/micromips").flag("+m32").flag("+mmicromips");
895 
896     auto MArchDefault = makeMultilib("").flag("-mips16").flag("-mmicromips");
897 
898     auto UCLibc = makeMultilib("/uclibc").flag("+muclibc");
899 
900     auto SoftFloat = makeMultilib("/soft-float").flag("+msoft-float");
901 
902     auto Nan2008 = makeMultilib("/nan2008").flag("+mnan=2008");
903 
904     auto DefaultFloat =
905         makeMultilib("").flag("-msoft-float").flag("-mnan=2008");
906 
907     auto BigEndian = makeMultilib("").flag("+EB").flag("-EL");
908 
909     auto LittleEndian = makeMultilib("/el").flag("+EL").flag("-EB");
910 
911     // Note that this one's osSuffix is ""
912     auto MAbi64 = makeMultilib("")
913                       .gccSuffix("/64")
914                       .includeSuffix("/64")
915                       .flag("+mabi=n64")
916                       .flag("-mabi=n32")
917                       .flag("-m32");
918 
919     CSMipsMultilibs =
920         MultilibSet()
921             .Either(MArchMips16, MArchMicroMips, MArchDefault)
922             .Maybe(UCLibc)
923             .Either(SoftFloat, Nan2008, DefaultFloat)
924             .FilterOut("/micromips/nan2008")
925             .FilterOut("/mips16/nan2008")
926             .Either(BigEndian, LittleEndian)
927             .Maybe(MAbi64)
928             .FilterOut("/mips16.*/64")
929             .FilterOut("/micromips.*/64")
930             .FilterOut(NonExistent)
931             .setIncludeDirsCallback([](const Multilib &M) {
932               std::vector<std::string> Dirs({"/include"});
933               if (StringRef(M.includeSuffix()).startswith("/uclibc"))
934                 Dirs.push_back(
935                     "/../../../../mips-linux-gnu/libc/uclibc/usr/include");
936               else
937                 Dirs.push_back("/../../../../mips-linux-gnu/libc/usr/include");
938               return Dirs;
939             });
940   }
941 
942   MultilibSet DebianMipsMultilibs;
943   {
944     Multilib MAbiN32 =
945         Multilib().gccSuffix("/n32").includeSuffix("/n32").flag("+mabi=n32");
946 
947     Multilib M64 = Multilib()
948                        .gccSuffix("/64")
949                        .includeSuffix("/64")
950                        .flag("+m64")
951                        .flag("-m32")
952                        .flag("-mabi=n32");
953 
954     Multilib M32 = Multilib().flag("-m64").flag("+m32").flag("-mabi=n32");
955 
956     DebianMipsMultilibs =
957         MultilibSet().Either(M32, M64, MAbiN32).FilterOut(NonExistent);
958   }
959 
960   // Sort candidates. Toolchain that best meets the directories tree goes first.
961   // Then select the first toolchains matches command line flags.
962   MultilibSet *Candidates[] = {&CSMipsMultilibs, &DebianMipsMultilibs};
963   if (CSMipsMultilibs.size() < DebianMipsMultilibs.size())
964     std::iter_swap(Candidates, Candidates + 1);
965   for (const MultilibSet *Candidate : Candidates) {
966     if (Candidate->select(Flags, Result.SelectedMultilib)) {
967       if (Candidate == &DebianMipsMultilibs)
968         Result.BiarchSibling = Multilib();
969       Result.Multilibs = *Candidate;
970       return true;
971     }
972   }
973   return false;
974 }
975 
976 static bool findMipsAndroidMultilibs(llvm::vfs::FileSystem &VFS, StringRef Path,
977                                      const Multilib::flags_list &Flags,
978                                      FilterNonExistent &NonExistent,
979                                      DetectedMultilibs &Result) {
980 
981   MultilibSet AndroidMipsMultilibs =
982       MultilibSet()
983           .Maybe(Multilib("/mips-r2").flag("+march=mips32r2"))
984           .Maybe(Multilib("/mips-r6").flag("+march=mips32r6"))
985           .FilterOut(NonExistent);
986 
987   MultilibSet AndroidMipselMultilibs =
988       MultilibSet()
989           .Either(Multilib().flag("+march=mips32"),
990                   Multilib("/mips-r2", "", "/mips-r2").flag("+march=mips32r2"),
991                   Multilib("/mips-r6", "", "/mips-r6").flag("+march=mips32r6"))
992           .FilterOut(NonExistent);
993 
994   MultilibSet AndroidMips64elMultilibs =
995       MultilibSet()
996           .Either(
997               Multilib().flag("+march=mips64r6"),
998               Multilib("/32/mips-r1", "", "/mips-r1").flag("+march=mips32"),
999               Multilib("/32/mips-r2", "", "/mips-r2").flag("+march=mips32r2"),
1000               Multilib("/32/mips-r6", "", "/mips-r6").flag("+march=mips32r6"))
1001           .FilterOut(NonExistent);
1002 
1003   MultilibSet *MS = &AndroidMipsMultilibs;
1004   if (VFS.exists(Path + "/mips-r6"))
1005     MS = &AndroidMipselMultilibs;
1006   else if (VFS.exists(Path + "/32"))
1007     MS = &AndroidMips64elMultilibs;
1008   if (MS->select(Flags, Result.SelectedMultilib)) {
1009     Result.Multilibs = *MS;
1010     return true;
1011   }
1012   return false;
1013 }
1014 
1015 static bool findMipsMuslMultilibs(const Multilib::flags_list &Flags,
1016                                   FilterNonExistent &NonExistent,
1017                                   DetectedMultilibs &Result) {
1018   // Musl toolchain multilibs
1019   MultilibSet MuslMipsMultilibs;
1020   {
1021     auto MArchMipsR2 = makeMultilib("")
1022                            .osSuffix("/mips-r2-hard-musl")
1023                            .flag("+EB")
1024                            .flag("-EL")
1025                            .flag("+march=mips32r2");
1026 
1027     auto MArchMipselR2 = makeMultilib("/mipsel-r2-hard-musl")
1028                              .flag("-EB")
1029                              .flag("+EL")
1030                              .flag("+march=mips32r2");
1031 
1032     MuslMipsMultilibs = MultilibSet().Either(MArchMipsR2, MArchMipselR2);
1033 
1034     // Specify the callback that computes the include directories.
1035     MuslMipsMultilibs.setIncludeDirsCallback([](const Multilib &M) {
1036       return std::vector<std::string>(
1037           {"/../sysroot" + M.osSuffix() + "/usr/include"});
1038     });
1039   }
1040   if (MuslMipsMultilibs.select(Flags, Result.SelectedMultilib)) {
1041     Result.Multilibs = MuslMipsMultilibs;
1042     return true;
1043   }
1044   return false;
1045 }
1046 
1047 static bool findMipsMtiMultilibs(const Multilib::flags_list &Flags,
1048                                  FilterNonExistent &NonExistent,
1049                                  DetectedMultilibs &Result) {
1050   // CodeScape MTI toolchain v1.2 and early.
1051   MultilibSet MtiMipsMultilibsV1;
1052   {
1053     auto MArchMips32 = makeMultilib("/mips32")
1054                            .flag("+m32")
1055                            .flag("-m64")
1056                            .flag("-mmicromips")
1057                            .flag("+march=mips32");
1058 
1059     auto MArchMicroMips = makeMultilib("/micromips")
1060                               .flag("+m32")
1061                               .flag("-m64")
1062                               .flag("+mmicromips");
1063 
1064     auto MArchMips64r2 = makeMultilib("/mips64r2")
1065                              .flag("-m32")
1066                              .flag("+m64")
1067                              .flag("+march=mips64r2");
1068 
1069     auto MArchMips64 = makeMultilib("/mips64").flag("-m32").flag("+m64").flag(
1070         "-march=mips64r2");
1071 
1072     auto MArchDefault = makeMultilib("")
1073                             .flag("+m32")
1074                             .flag("-m64")
1075                             .flag("-mmicromips")
1076                             .flag("+march=mips32r2");
1077 
1078     auto Mips16 = makeMultilib("/mips16").flag("+mips16");
1079 
1080     auto UCLibc = makeMultilib("/uclibc").flag("+muclibc");
1081 
1082     auto MAbi64 =
1083         makeMultilib("/64").flag("+mabi=n64").flag("-mabi=n32").flag("-m32");
1084 
1085     auto BigEndian = makeMultilib("").flag("+EB").flag("-EL");
1086 
1087     auto LittleEndian = makeMultilib("/el").flag("+EL").flag("-EB");
1088 
1089     auto SoftFloat = makeMultilib("/sof").flag("+msoft-float");
1090 
1091     auto Nan2008 = makeMultilib("/nan2008").flag("+mnan=2008");
1092 
1093     MtiMipsMultilibsV1 =
1094         MultilibSet()
1095             .Either(MArchMips32, MArchMicroMips, MArchMips64r2, MArchMips64,
1096                     MArchDefault)
1097             .Maybe(UCLibc)
1098             .Maybe(Mips16)
1099             .FilterOut("/mips64/mips16")
1100             .FilterOut("/mips64r2/mips16")
1101             .FilterOut("/micromips/mips16")
1102             .Maybe(MAbi64)
1103             .FilterOut("/micromips/64")
1104             .FilterOut("/mips32/64")
1105             .FilterOut("^/64")
1106             .FilterOut("/mips16/64")
1107             .Either(BigEndian, LittleEndian)
1108             .Maybe(SoftFloat)
1109             .Maybe(Nan2008)
1110             .FilterOut(".*sof/nan2008")
1111             .FilterOut(NonExistent)
1112             .setIncludeDirsCallback([](const Multilib &M) {
1113               std::vector<std::string> Dirs({"/include"});
1114               if (StringRef(M.includeSuffix()).startswith("/uclibc"))
1115                 Dirs.push_back("/../../../../sysroot/uclibc/usr/include");
1116               else
1117                 Dirs.push_back("/../../../../sysroot/usr/include");
1118               return Dirs;
1119             });
1120   }
1121 
1122   // CodeScape IMG toolchain starting from v1.3.
1123   MultilibSet MtiMipsMultilibsV2;
1124   {
1125     auto BeHard = makeMultilib("/mips-r2-hard")
1126                       .flag("+EB")
1127                       .flag("-msoft-float")
1128                       .flag("-mnan=2008")
1129                       .flag("-muclibc");
1130     auto BeSoft = makeMultilib("/mips-r2-soft")
1131                       .flag("+EB")
1132                       .flag("+msoft-float")
1133                       .flag("-mnan=2008");
1134     auto ElHard = makeMultilib("/mipsel-r2-hard")
1135                       .flag("+EL")
1136                       .flag("-msoft-float")
1137                       .flag("-mnan=2008")
1138                       .flag("-muclibc");
1139     auto ElSoft = makeMultilib("/mipsel-r2-soft")
1140                       .flag("+EL")
1141                       .flag("+msoft-float")
1142                       .flag("-mnan=2008")
1143                       .flag("-mmicromips");
1144     auto BeHardNan = makeMultilib("/mips-r2-hard-nan2008")
1145                          .flag("+EB")
1146                          .flag("-msoft-float")
1147                          .flag("+mnan=2008")
1148                          .flag("-muclibc");
1149     auto ElHardNan = makeMultilib("/mipsel-r2-hard-nan2008")
1150                          .flag("+EL")
1151                          .flag("-msoft-float")
1152                          .flag("+mnan=2008")
1153                          .flag("-muclibc")
1154                          .flag("-mmicromips");
1155     auto BeHardNanUclibc = makeMultilib("/mips-r2-hard-nan2008-uclibc")
1156                                .flag("+EB")
1157                                .flag("-msoft-float")
1158                                .flag("+mnan=2008")
1159                                .flag("+muclibc");
1160     auto ElHardNanUclibc = makeMultilib("/mipsel-r2-hard-nan2008-uclibc")
1161                                .flag("+EL")
1162                                .flag("-msoft-float")
1163                                .flag("+mnan=2008")
1164                                .flag("+muclibc");
1165     auto BeHardUclibc = makeMultilib("/mips-r2-hard-uclibc")
1166                             .flag("+EB")
1167                             .flag("-msoft-float")
1168                             .flag("-mnan=2008")
1169                             .flag("+muclibc");
1170     auto ElHardUclibc = makeMultilib("/mipsel-r2-hard-uclibc")
1171                             .flag("+EL")
1172                             .flag("-msoft-float")
1173                             .flag("-mnan=2008")
1174                             .flag("+muclibc");
1175     auto ElMicroHardNan = makeMultilib("/micromipsel-r2-hard-nan2008")
1176                               .flag("+EL")
1177                               .flag("-msoft-float")
1178                               .flag("+mnan=2008")
1179                               .flag("+mmicromips");
1180     auto ElMicroSoft = makeMultilib("/micromipsel-r2-soft")
1181                            .flag("+EL")
1182                            .flag("+msoft-float")
1183                            .flag("-mnan=2008")
1184                            .flag("+mmicromips");
1185 
1186     auto O32 =
1187         makeMultilib("/lib").osSuffix("").flag("-mabi=n32").flag("-mabi=n64");
1188     auto N32 =
1189         makeMultilib("/lib32").osSuffix("").flag("+mabi=n32").flag("-mabi=n64");
1190     auto N64 =
1191         makeMultilib("/lib64").osSuffix("").flag("-mabi=n32").flag("+mabi=n64");
1192 
1193     MtiMipsMultilibsV2 =
1194         MultilibSet()
1195             .Either({BeHard, BeSoft, ElHard, ElSoft, BeHardNan, ElHardNan,
1196                      BeHardNanUclibc, ElHardNanUclibc, BeHardUclibc,
1197                      ElHardUclibc, ElMicroHardNan, ElMicroSoft})
1198             .Either(O32, N32, N64)
1199             .FilterOut(NonExistent)
1200             .setIncludeDirsCallback([](const Multilib &M) {
1201               return std::vector<std::string>({"/../../../../sysroot" +
1202                                                M.includeSuffix() +
1203                                                "/../usr/include"});
1204             })
1205             .setFilePathsCallback([](const Multilib &M) {
1206               return std::vector<std::string>(
1207                   {"/../../../../mips-mti-linux-gnu/lib" + M.gccSuffix()});
1208             });
1209   }
1210   for (auto Candidate : {&MtiMipsMultilibsV1, &MtiMipsMultilibsV2}) {
1211     if (Candidate->select(Flags, Result.SelectedMultilib)) {
1212       Result.Multilibs = *Candidate;
1213       return true;
1214     }
1215   }
1216   return false;
1217 }
1218 
1219 static bool findMipsImgMultilibs(const Multilib::flags_list &Flags,
1220                                  FilterNonExistent &NonExistent,
1221                                  DetectedMultilibs &Result) {
1222   // CodeScape IMG toolchain v1.2 and early.
1223   MultilibSet ImgMultilibsV1;
1224   {
1225     auto Mips64r6 = makeMultilib("/mips64r6").flag("+m64").flag("-m32");
1226 
1227     auto LittleEndian = makeMultilib("/el").flag("+EL").flag("-EB");
1228 
1229     auto MAbi64 =
1230         makeMultilib("/64").flag("+mabi=n64").flag("-mabi=n32").flag("-m32");
1231 
1232     ImgMultilibsV1 =
1233         MultilibSet()
1234             .Maybe(Mips64r6)
1235             .Maybe(MAbi64)
1236             .Maybe(LittleEndian)
1237             .FilterOut(NonExistent)
1238             .setIncludeDirsCallback([](const Multilib &M) {
1239               return std::vector<std::string>(
1240                   {"/include", "/../../../../sysroot/usr/include"});
1241             });
1242   }
1243 
1244   // CodeScape IMG toolchain starting from v1.3.
1245   MultilibSet ImgMultilibsV2;
1246   {
1247     auto BeHard = makeMultilib("/mips-r6-hard")
1248                       .flag("+EB")
1249                       .flag("-msoft-float")
1250                       .flag("-mmicromips");
1251     auto BeSoft = makeMultilib("/mips-r6-soft")
1252                       .flag("+EB")
1253                       .flag("+msoft-float")
1254                       .flag("-mmicromips");
1255     auto ElHard = makeMultilib("/mipsel-r6-hard")
1256                       .flag("+EL")
1257                       .flag("-msoft-float")
1258                       .flag("-mmicromips");
1259     auto ElSoft = makeMultilib("/mipsel-r6-soft")
1260                       .flag("+EL")
1261                       .flag("+msoft-float")
1262                       .flag("-mmicromips");
1263     auto BeMicroHard = makeMultilib("/micromips-r6-hard")
1264                            .flag("+EB")
1265                            .flag("-msoft-float")
1266                            .flag("+mmicromips");
1267     auto BeMicroSoft = makeMultilib("/micromips-r6-soft")
1268                            .flag("+EB")
1269                            .flag("+msoft-float")
1270                            .flag("+mmicromips");
1271     auto ElMicroHard = makeMultilib("/micromipsel-r6-hard")
1272                            .flag("+EL")
1273                            .flag("-msoft-float")
1274                            .flag("+mmicromips");
1275     auto ElMicroSoft = makeMultilib("/micromipsel-r6-soft")
1276                            .flag("+EL")
1277                            .flag("+msoft-float")
1278                            .flag("+mmicromips");
1279 
1280     auto O32 =
1281         makeMultilib("/lib").osSuffix("").flag("-mabi=n32").flag("-mabi=n64");
1282     auto N32 =
1283         makeMultilib("/lib32").osSuffix("").flag("+mabi=n32").flag("-mabi=n64");
1284     auto N64 =
1285         makeMultilib("/lib64").osSuffix("").flag("-mabi=n32").flag("+mabi=n64");
1286 
1287     ImgMultilibsV2 =
1288         MultilibSet()
1289             .Either({BeHard, BeSoft, ElHard, ElSoft, BeMicroHard, BeMicroSoft,
1290                      ElMicroHard, ElMicroSoft})
1291             .Either(O32, N32, N64)
1292             .FilterOut(NonExistent)
1293             .setIncludeDirsCallback([](const Multilib &M) {
1294               return std::vector<std::string>({"/../../../../sysroot" +
1295                                                M.includeSuffix() +
1296                                                "/../usr/include"});
1297             })
1298             .setFilePathsCallback([](const Multilib &M) {
1299               return std::vector<std::string>(
1300                   {"/../../../../mips-img-linux-gnu/lib" + M.gccSuffix()});
1301             });
1302   }
1303   for (auto Candidate : {&ImgMultilibsV1, &ImgMultilibsV2}) {
1304     if (Candidate->select(Flags, Result.SelectedMultilib)) {
1305       Result.Multilibs = *Candidate;
1306       return true;
1307     }
1308   }
1309   return false;
1310 }
1311 
1312 bool clang::driver::findMIPSMultilibs(const Driver &D,
1313                                       const llvm::Triple &TargetTriple,
1314                                       StringRef Path, const ArgList &Args,
1315                                       DetectedMultilibs &Result) {
1316   FilterNonExistent NonExistent(Path, "/crtbegin.o", D.getVFS());
1317 
1318   StringRef CPUName;
1319   StringRef ABIName;
1320   tools::mips::getMipsCPUAndABI(Args, TargetTriple, CPUName, ABIName);
1321 
1322   llvm::Triple::ArchType TargetArch = TargetTriple.getArch();
1323 
1324   Multilib::flags_list Flags;
1325   addMultilibFlag(TargetTriple.isMIPS32(), "m32", Flags);
1326   addMultilibFlag(TargetTriple.isMIPS64(), "m64", Flags);
1327   addMultilibFlag(isMips16(Args), "mips16", Flags);
1328   addMultilibFlag(CPUName == "mips32", "march=mips32", Flags);
1329   addMultilibFlag(CPUName == "mips32r2" || CPUName == "mips32r3" ||
1330                       CPUName == "mips32r5" || CPUName == "p5600",
1331                   "march=mips32r2", Flags);
1332   addMultilibFlag(CPUName == "mips32r6", "march=mips32r6", Flags);
1333   addMultilibFlag(CPUName == "mips64", "march=mips64", Flags);
1334   addMultilibFlag(CPUName == "mips64r2" || CPUName == "mips64r3" ||
1335                       CPUName == "mips64r5" || CPUName == "octeon",
1336                   "march=mips64r2", Flags);
1337   addMultilibFlag(CPUName == "mips64r6", "march=mips64r6", Flags);
1338   addMultilibFlag(isMicroMips(Args), "mmicromips", Flags);
1339   addMultilibFlag(tools::mips::isUCLibc(Args), "muclibc", Flags);
1340   addMultilibFlag(tools::mips::isNaN2008(Args, TargetTriple), "mnan=2008",
1341                   Flags);
1342   addMultilibFlag(ABIName == "n32", "mabi=n32", Flags);
1343   addMultilibFlag(ABIName == "n64", "mabi=n64", Flags);
1344   addMultilibFlag(isSoftFloatABI(Args), "msoft-float", Flags);
1345   addMultilibFlag(!isSoftFloatABI(Args), "mhard-float", Flags);
1346   addMultilibFlag(isMipsEL(TargetArch), "EL", Flags);
1347   addMultilibFlag(!isMipsEL(TargetArch), "EB", Flags);
1348 
1349   if (TargetTriple.isAndroid())
1350     return findMipsAndroidMultilibs(D.getVFS(), Path, Flags, NonExistent,
1351                                     Result);
1352 
1353   if (TargetTriple.getVendor() == llvm::Triple::MipsTechnologies &&
1354       TargetTriple.getOS() == llvm::Triple::Linux &&
1355       TargetTriple.getEnvironment() == llvm::Triple::UnknownEnvironment)
1356     return findMipsMuslMultilibs(Flags, NonExistent, Result);
1357 
1358   if (TargetTriple.getVendor() == llvm::Triple::MipsTechnologies &&
1359       TargetTriple.getOS() == llvm::Triple::Linux &&
1360       TargetTriple.isGNUEnvironment())
1361     return findMipsMtiMultilibs(Flags, NonExistent, Result);
1362 
1363   if (TargetTriple.getVendor() == llvm::Triple::ImaginationTechnologies &&
1364       TargetTriple.getOS() == llvm::Triple::Linux &&
1365       TargetTriple.isGNUEnvironment())
1366     return findMipsImgMultilibs(Flags, NonExistent, Result);
1367 
1368   if (findMipsCsMultilibs(Flags, NonExistent, Result))
1369     return true;
1370 
1371   // Fallback to the regular toolchain-tree structure.
1372   Multilib Default;
1373   Result.Multilibs.push_back(Default);
1374   Result.Multilibs.FilterOut(NonExistent);
1375 
1376   if (Result.Multilibs.select(Flags, Result.SelectedMultilib)) {
1377     Result.BiarchSibling = Multilib();
1378     return true;
1379   }
1380 
1381   return false;
1382 }
1383 
1384 static void findAndroidArmMultilibs(const Driver &D,
1385                                     const llvm::Triple &TargetTriple,
1386                                     StringRef Path, const ArgList &Args,
1387                                     DetectedMultilibs &Result) {
1388   // Find multilibs with subdirectories like armv7-a, thumb, armv7-a/thumb.
1389   FilterNonExistent NonExistent(Path, "/crtbegin.o", D.getVFS());
1390   Multilib ArmV7Multilib = makeMultilib("/armv7-a")
1391                                .flag("+march=armv7-a")
1392                                .flag("-mthumb");
1393   Multilib ThumbMultilib = makeMultilib("/thumb")
1394                                .flag("-march=armv7-a")
1395                                .flag("+mthumb");
1396   Multilib ArmV7ThumbMultilib = makeMultilib("/armv7-a/thumb")
1397                                .flag("+march=armv7-a")
1398                                .flag("+mthumb");
1399   Multilib DefaultMultilib = makeMultilib("")
1400                                .flag("-march=armv7-a")
1401                                .flag("-mthumb");
1402   MultilibSet AndroidArmMultilibs =
1403       MultilibSet()
1404           .Either(ThumbMultilib, ArmV7Multilib,
1405                   ArmV7ThumbMultilib, DefaultMultilib)
1406           .FilterOut(NonExistent);
1407 
1408   Multilib::flags_list Flags;
1409   llvm::StringRef Arch = Args.getLastArgValue(options::OPT_march_EQ);
1410   bool IsArmArch = TargetTriple.getArch() == llvm::Triple::arm;
1411   bool IsThumbArch = TargetTriple.getArch() == llvm::Triple::thumb;
1412   bool IsV7SubArch = TargetTriple.getSubArch() == llvm::Triple::ARMSubArch_v7;
1413   bool IsThumbMode = IsThumbArch ||
1414       Args.hasFlag(options::OPT_mthumb, options::OPT_mno_thumb, false) ||
1415       (IsArmArch && llvm::ARM::parseArchISA(Arch) == llvm::ARM::ISAKind::THUMB);
1416   bool IsArmV7Mode = (IsArmArch || IsThumbArch) &&
1417       (llvm::ARM::parseArchVersion(Arch) == 7 ||
1418        (IsArmArch && Arch == "" && IsV7SubArch));
1419   addMultilibFlag(IsArmV7Mode, "march=armv7-a", Flags);
1420   addMultilibFlag(IsThumbMode, "mthumb", Flags);
1421 
1422   if (AndroidArmMultilibs.select(Flags, Result.SelectedMultilib))
1423     Result.Multilibs = AndroidArmMultilibs;
1424 }
1425 
1426 static void findRISCVMultilibs(const Driver &D,
1427                                const llvm::Triple &TargetTriple, StringRef Path,
1428                                const ArgList &Args, DetectedMultilibs &Result) {
1429 
1430   FilterNonExistent NonExistent(Path, "/crtbegin.o", D.getVFS());
1431   Multilib Ilp32 = makeMultilib("lib32/ilp32").flag("+m32").flag("+mabi=ilp32");
1432   Multilib Ilp32f =
1433       makeMultilib("lib32/ilp32f").flag("+m32").flag("+mabi=ilp32f");
1434   Multilib Ilp32d =
1435       makeMultilib("lib32/ilp32d").flag("+m32").flag("+mabi=ilp32d");
1436   Multilib Lp64 = makeMultilib("lib64/lp64").flag("+m64").flag("+mabi=lp64");
1437   Multilib Lp64f = makeMultilib("lib64/lp64f").flag("+m64").flag("+mabi=lp64f");
1438   Multilib Lp64d = makeMultilib("lib64/lp64d").flag("+m64").flag("+mabi=lp64d");
1439   MultilibSet RISCVMultilibs =
1440       MultilibSet()
1441           .Either({Ilp32, Ilp32f, Ilp32d, Lp64, Lp64f, Lp64d})
1442           .FilterOut(NonExistent);
1443 
1444   Multilib::flags_list Flags;
1445   bool IsRV64 = TargetTriple.getArch() == llvm::Triple::riscv64;
1446   StringRef ABIName = tools::riscv::getRISCVABI(Args, TargetTriple);
1447 
1448   addMultilibFlag(!IsRV64, "m32", Flags);
1449   addMultilibFlag(IsRV64, "m64", Flags);
1450   addMultilibFlag(ABIName == "ilp32", "mabi=ilp32", Flags);
1451   addMultilibFlag(ABIName == "ilp32f", "mabi=ilp32f", Flags);
1452   addMultilibFlag(ABIName == "ilp32d", "mabi=ilp32d", Flags);
1453   addMultilibFlag(ABIName == "lp64", "mabi=lp64", Flags);
1454   addMultilibFlag(ABIName == "lp64f", "mabi=lp64f", Flags);
1455   addMultilibFlag(ABIName == "lp64d", "mabi=lp64d", Flags);
1456 
1457   if (RISCVMultilibs.select(Flags, Result.SelectedMultilib))
1458     Result.Multilibs = RISCVMultilibs;
1459 }
1460 
1461 static bool findBiarchMultilibs(const Driver &D,
1462                                 const llvm::Triple &TargetTriple,
1463                                 StringRef Path, const ArgList &Args,
1464                                 bool NeedsBiarchSuffix,
1465                                 DetectedMultilibs &Result) {
1466   Multilib Default;
1467 
1468   // Some versions of SUSE and Fedora on ppc64 put 32-bit libs
1469   // in what would normally be GCCInstallPath and put the 64-bit
1470   // libs in a subdirectory named 64. The simple logic we follow is that
1471   // *if* there is a subdirectory of the right name with crtbegin.o in it,
1472   // we use that. If not, and if not a biarch triple alias, we look for
1473   // crtbegin.o without the subdirectory.
1474 
1475   StringRef Suff64 = "/64";
1476   // Solaris uses platform-specific suffixes instead of /64.
1477   if (TargetTriple.getOS() == llvm::Triple::Solaris) {
1478     switch (TargetTriple.getArch()) {
1479     case llvm::Triple::x86:
1480     case llvm::Triple::x86_64:
1481       Suff64 = "/amd64";
1482       break;
1483     case llvm::Triple::sparc:
1484     case llvm::Triple::sparcv9:
1485       Suff64 = "/sparcv9";
1486       break;
1487     default:
1488       break;
1489     }
1490   }
1491 
1492   Multilib Alt64 = Multilib()
1493                        .gccSuffix(Suff64)
1494                        .includeSuffix(Suff64)
1495                        .flag("-m32")
1496                        .flag("+m64")
1497                        .flag("-mx32");
1498   Multilib Alt32 = Multilib()
1499                        .gccSuffix("/32")
1500                        .includeSuffix("/32")
1501                        .flag("+m32")
1502                        .flag("-m64")
1503                        .flag("-mx32");
1504   Multilib Altx32 = Multilib()
1505                         .gccSuffix("/x32")
1506                         .includeSuffix("/x32")
1507                         .flag("-m32")
1508                         .flag("-m64")
1509                         .flag("+mx32");
1510 
1511   // GCC toolchain for IAMCU doesn't have crtbegin.o, so look for libgcc.a.
1512   FilterNonExistent NonExistent(
1513       Path, TargetTriple.isOSIAMCU() ? "/libgcc.a" : "/crtbegin.o", D.getVFS());
1514 
1515   // Determine default multilib from: 32, 64, x32
1516   // Also handle cases such as 64 on 32, 32 on 64, etc.
1517   enum { UNKNOWN, WANT32, WANT64, WANTX32 } Want = UNKNOWN;
1518   const bool IsX32 = TargetTriple.getEnvironment() == llvm::Triple::GNUX32;
1519   if (TargetTriple.isArch32Bit() && !NonExistent(Alt32))
1520     Want = WANT64;
1521   else if (TargetTriple.isArch64Bit() && IsX32 && !NonExistent(Altx32))
1522     Want = WANT64;
1523   else if (TargetTriple.isArch64Bit() && !IsX32 && !NonExistent(Alt64))
1524     Want = WANT32;
1525   else {
1526     if (TargetTriple.isArch32Bit())
1527       Want = NeedsBiarchSuffix ? WANT64 : WANT32;
1528     else if (IsX32)
1529       Want = NeedsBiarchSuffix ? WANT64 : WANTX32;
1530     else
1531       Want = NeedsBiarchSuffix ? WANT32 : WANT64;
1532   }
1533 
1534   if (Want == WANT32)
1535     Default.flag("+m32").flag("-m64").flag("-mx32");
1536   else if (Want == WANT64)
1537     Default.flag("-m32").flag("+m64").flag("-mx32");
1538   else if (Want == WANTX32)
1539     Default.flag("-m32").flag("-m64").flag("+mx32");
1540   else
1541     return false;
1542 
1543   Result.Multilibs.push_back(Default);
1544   Result.Multilibs.push_back(Alt64);
1545   Result.Multilibs.push_back(Alt32);
1546   Result.Multilibs.push_back(Altx32);
1547 
1548   Result.Multilibs.FilterOut(NonExistent);
1549 
1550   Multilib::flags_list Flags;
1551   addMultilibFlag(TargetTriple.isArch64Bit() && !IsX32, "m64", Flags);
1552   addMultilibFlag(TargetTriple.isArch32Bit(), "m32", Flags);
1553   addMultilibFlag(TargetTriple.isArch64Bit() && IsX32, "mx32", Flags);
1554 
1555   if (!Result.Multilibs.select(Flags, Result.SelectedMultilib))
1556     return false;
1557 
1558   if (Result.SelectedMultilib == Alt64 || Result.SelectedMultilib == Alt32 ||
1559       Result.SelectedMultilib == Altx32)
1560     Result.BiarchSibling = Default;
1561 
1562   return true;
1563 }
1564 
1565 /// Generic_GCC - A tool chain using the 'gcc' command to perform
1566 /// all subcommands; this relies on gcc translating the majority of
1567 /// command line options.
1568 
1569 /// Less-than for GCCVersion, implementing a Strict Weak Ordering.
1570 bool Generic_GCC::GCCVersion::isOlderThan(int RHSMajor, int RHSMinor,
1571                                           int RHSPatch,
1572                                           StringRef RHSPatchSuffix) const {
1573   if (Major != RHSMajor)
1574     return Major < RHSMajor;
1575   if (Minor != RHSMinor)
1576     return Minor < RHSMinor;
1577   if (Patch != RHSPatch) {
1578     // Note that versions without a specified patch sort higher than those with
1579     // a patch.
1580     if (RHSPatch == -1)
1581       return true;
1582     if (Patch == -1)
1583       return false;
1584 
1585     // Otherwise just sort on the patch itself.
1586     return Patch < RHSPatch;
1587   }
1588   if (PatchSuffix != RHSPatchSuffix) {
1589     // Sort empty suffixes higher.
1590     if (RHSPatchSuffix.empty())
1591       return true;
1592     if (PatchSuffix.empty())
1593       return false;
1594 
1595     // Provide a lexicographic sort to make this a total ordering.
1596     return PatchSuffix < RHSPatchSuffix;
1597   }
1598 
1599   // The versions are equal.
1600   return false;
1601 }
1602 
1603 /// Parse a GCCVersion object out of a string of text.
1604 ///
1605 /// This is the primary means of forming GCCVersion objects.
1606 /*static*/
1607 Generic_GCC::GCCVersion Generic_GCC::GCCVersion::Parse(StringRef VersionText) {
1608   const GCCVersion BadVersion = {VersionText.str(), -1, -1, -1, "", "", ""};
1609   std::pair<StringRef, StringRef> First = VersionText.split('.');
1610   std::pair<StringRef, StringRef> Second = First.second.split('.');
1611 
1612   GCCVersion GoodVersion = {VersionText.str(), -1, -1, -1, "", "", ""};
1613   if (First.first.getAsInteger(10, GoodVersion.Major) || GoodVersion.Major < 0)
1614     return BadVersion;
1615   GoodVersion.MajorStr = First.first.str();
1616   if (First.second.empty())
1617     return GoodVersion;
1618   StringRef MinorStr = Second.first;
1619   if (Second.second.empty()) {
1620     if (size_t EndNumber = MinorStr.find_first_not_of("0123456789")) {
1621       GoodVersion.PatchSuffix = MinorStr.substr(EndNumber);
1622       MinorStr = MinorStr.slice(0, EndNumber);
1623     }
1624   }
1625   if (MinorStr.getAsInteger(10, GoodVersion.Minor) || GoodVersion.Minor < 0)
1626     return BadVersion;
1627   GoodVersion.MinorStr = MinorStr.str();
1628 
1629   // First look for a number prefix and parse that if present. Otherwise just
1630   // stash the entire patch string in the suffix, and leave the number
1631   // unspecified. This covers versions strings such as:
1632   //   5        (handled above)
1633   //   4.4
1634   //   4.4-patched
1635   //   4.4.0
1636   //   4.4.x
1637   //   4.4.2-rc4
1638   //   4.4.x-patched
1639   // And retains any patch number it finds.
1640   StringRef PatchText = Second.second;
1641   if (!PatchText.empty()) {
1642     if (size_t EndNumber = PatchText.find_first_not_of("0123456789")) {
1643       // Try to parse the number and any suffix.
1644       if (PatchText.slice(0, EndNumber).getAsInteger(10, GoodVersion.Patch) ||
1645           GoodVersion.Patch < 0)
1646         return BadVersion;
1647       GoodVersion.PatchSuffix = PatchText.substr(EndNumber);
1648     }
1649   }
1650 
1651   return GoodVersion;
1652 }
1653 
1654 static llvm::StringRef getGCCToolchainDir(const ArgList &Args,
1655                                           llvm::StringRef SysRoot) {
1656   const Arg *A = Args.getLastArg(clang::driver::options::OPT_gcc_toolchain);
1657   if (A)
1658     return A->getValue();
1659 
1660   // If we have a SysRoot, ignore GCC_INSTALL_PREFIX.
1661   // GCC_INSTALL_PREFIX specifies the gcc installation for the default
1662   // sysroot and is likely not valid with a different sysroot.
1663   if (!SysRoot.empty())
1664     return "";
1665 
1666   return GCC_INSTALL_PREFIX;
1667 }
1668 
1669 /// Initialize a GCCInstallationDetector from the driver.
1670 ///
1671 /// This performs all of the autodetection and sets up the various paths.
1672 /// Once constructed, a GCCInstallationDetector is essentially immutable.
1673 ///
1674 /// FIXME: We shouldn't need an explicit TargetTriple parameter here, and
1675 /// should instead pull the target out of the driver. This is currently
1676 /// necessary because the driver doesn't store the final version of the target
1677 /// triple.
1678 void Generic_GCC::GCCInstallationDetector::init(
1679     const llvm::Triple &TargetTriple, const ArgList &Args,
1680     ArrayRef<std::string> ExtraTripleAliases) {
1681   llvm::Triple BiarchVariantTriple = TargetTriple.isArch32Bit()
1682                                          ? TargetTriple.get64BitArchVariant()
1683                                          : TargetTriple.get32BitArchVariant();
1684   // The library directories which may contain GCC installations.
1685   SmallVector<StringRef, 4> CandidateLibDirs, CandidateBiarchLibDirs;
1686   // The compatible GCC triples for this particular architecture.
1687   SmallVector<StringRef, 16> CandidateTripleAliases;
1688   SmallVector<StringRef, 16> CandidateBiarchTripleAliases;
1689   CollectLibDirsAndTriples(TargetTriple, BiarchVariantTriple, CandidateLibDirs,
1690                            CandidateTripleAliases, CandidateBiarchLibDirs,
1691                            CandidateBiarchTripleAliases);
1692 
1693   // Compute the set of prefixes for our search.
1694   SmallVector<std::string, 8> Prefixes(D.PrefixDirs.begin(),
1695                                        D.PrefixDirs.end());
1696 
1697   StringRef GCCToolchainDir = getGCCToolchainDir(Args, D.SysRoot);
1698   if (GCCToolchainDir != "") {
1699     if (GCCToolchainDir.back() == '/')
1700       GCCToolchainDir = GCCToolchainDir.drop_back(); // remove the /
1701 
1702     Prefixes.push_back(GCCToolchainDir);
1703   } else {
1704     // If we have a SysRoot, try that first.
1705     if (!D.SysRoot.empty()) {
1706       Prefixes.push_back(D.SysRoot);
1707       AddDefaultGCCPrefixes(TargetTriple, Prefixes, D.SysRoot);
1708     }
1709 
1710     // Then look for gcc installed alongside clang.
1711     Prefixes.push_back(D.InstalledDir + "/..");
1712 
1713     // Next, look for prefix(es) that correspond to distribution-supplied gcc
1714     // installations.
1715     if (D.SysRoot.empty()) {
1716       // Typically /usr.
1717       AddDefaultGCCPrefixes(TargetTriple, Prefixes, D.SysRoot);
1718     }
1719   }
1720 
1721   // Try to respect gcc-config on Gentoo. However, do that only
1722   // if --gcc-toolchain is not provided or equal to the Gentoo install
1723   // in /usr. This avoids accidentally enforcing the system GCC version
1724   // when using a custom toolchain.
1725   if (GCCToolchainDir == "" || GCCToolchainDir == D.SysRoot + "/usr") {
1726     SmallVector<StringRef, 16> GentooTestTriples;
1727     // Try to match an exact triple as target triple first.
1728     // e.g. crossdev -S x86_64-gentoo-linux-gnu will install gcc libs for
1729     // x86_64-gentoo-linux-gnu. But "clang -target x86_64-gentoo-linux-gnu"
1730     // may pick the libraries for x86_64-pc-linux-gnu even when exact matching
1731     // triple x86_64-gentoo-linux-gnu is present.
1732     GentooTestTriples.push_back(TargetTriple.str());
1733     // Check rest of triples.
1734     GentooTestTriples.append(ExtraTripleAliases.begin(),
1735                              ExtraTripleAliases.end());
1736     GentooTestTriples.append(CandidateTripleAliases.begin(),
1737                              CandidateTripleAliases.end());
1738     if (ScanGentooConfigs(TargetTriple, Args, GentooTestTriples,
1739                           CandidateBiarchTripleAliases))
1740       return;
1741   }
1742 
1743   // Loop over the various components which exist and select the best GCC
1744   // installation available. GCC installs are ranked by version number.
1745   Version = GCCVersion::Parse("0.0.0");
1746   for (const std::string &Prefix : Prefixes) {
1747     if (!D.getVFS().exists(Prefix))
1748       continue;
1749     for (StringRef Suffix : CandidateLibDirs) {
1750       const std::string LibDir = Prefix + Suffix.str();
1751       if (!D.getVFS().exists(LibDir))
1752         continue;
1753       // Try to match the exact target triple first.
1754       ScanLibDirForGCCTriple(TargetTriple, Args, LibDir, TargetTriple.str());
1755       // Try rest of possible triples.
1756       for (StringRef Candidate : ExtraTripleAliases) // Try these first.
1757         ScanLibDirForGCCTriple(TargetTriple, Args, LibDir, Candidate);
1758       for (StringRef Candidate : CandidateTripleAliases)
1759         ScanLibDirForGCCTriple(TargetTriple, Args, LibDir, Candidate);
1760     }
1761     for (StringRef Suffix : CandidateBiarchLibDirs) {
1762       const std::string LibDir = Prefix + Suffix.str();
1763       if (!D.getVFS().exists(LibDir))
1764         continue;
1765       for (StringRef Candidate : CandidateBiarchTripleAliases)
1766         ScanLibDirForGCCTriple(TargetTriple, Args, LibDir, Candidate,
1767                                /*NeedsBiarchSuffix=*/ true);
1768     }
1769   }
1770 }
1771 
1772 void Generic_GCC::GCCInstallationDetector::print(raw_ostream &OS) const {
1773   for (const auto &InstallPath : CandidateGCCInstallPaths)
1774     OS << "Found candidate GCC installation: " << InstallPath << "\n";
1775 
1776   if (!GCCInstallPath.empty())
1777     OS << "Selected GCC installation: " << GCCInstallPath << "\n";
1778 
1779   for (const auto &Multilib : Multilibs)
1780     OS << "Candidate multilib: " << Multilib << "\n";
1781 
1782   if (Multilibs.size() != 0 || !SelectedMultilib.isDefault())
1783     OS << "Selected multilib: " << SelectedMultilib << "\n";
1784 }
1785 
1786 bool Generic_GCC::GCCInstallationDetector::getBiarchSibling(Multilib &M) const {
1787   if (BiarchSibling.hasValue()) {
1788     M = BiarchSibling.getValue();
1789     return true;
1790   }
1791   return false;
1792 }
1793 
1794 void Generic_GCC::GCCInstallationDetector::AddDefaultGCCPrefixes(
1795     const llvm::Triple &TargetTriple, SmallVectorImpl<std::string> &Prefixes,
1796     StringRef SysRoot) {
1797   if (TargetTriple.getOS() == llvm::Triple::Solaris) {
1798     // Solaris is a special case.
1799     // The GCC installation is under
1800     //   /usr/gcc/<major>.<minor>/lib/gcc/<triple>/<major>.<minor>.<patch>/
1801     // so we need to find those /usr/gcc/*/lib/gcc libdirs and go with
1802     // /usr/gcc/<version> as a prefix.
1803 
1804     std::string PrefixDir = SysRoot.str() + "/usr/gcc";
1805     std::error_code EC;
1806     for (llvm::vfs::directory_iterator LI = D.getVFS().dir_begin(PrefixDir, EC),
1807                                        LE;
1808          !EC && LI != LE; LI = LI.increment(EC)) {
1809       StringRef VersionText = llvm::sys::path::filename(LI->path());
1810       GCCVersion CandidateVersion = GCCVersion::Parse(VersionText);
1811 
1812       // Filter out obviously bad entries.
1813       if (CandidateVersion.Major == -1 || CandidateVersion.isOlderThan(4, 1, 1))
1814         continue;
1815 
1816       std::string CandidatePrefix = PrefixDir + "/" + VersionText.str();
1817       std::string CandidateLibPath = CandidatePrefix + "/lib/gcc";
1818       if (!D.getVFS().exists(CandidateLibPath))
1819         continue;
1820 
1821       Prefixes.push_back(CandidatePrefix);
1822     }
1823     return;
1824   }
1825 
1826   // Non-Solaris is much simpler - most systems just go with "/usr".
1827   if (SysRoot.empty() && TargetTriple.getOS() == llvm::Triple::Linux) {
1828     // Yet, still look for RHEL devtoolsets.
1829     Prefixes.push_back("/opt/rh/devtoolset-7/root/usr");
1830     Prefixes.push_back("/opt/rh/devtoolset-6/root/usr");
1831     Prefixes.push_back("/opt/rh/devtoolset-4/root/usr");
1832     Prefixes.push_back("/opt/rh/devtoolset-3/root/usr");
1833     Prefixes.push_back("/opt/rh/devtoolset-2/root/usr");
1834   }
1835   Prefixes.push_back(SysRoot.str() + "/usr");
1836 }
1837 
1838 /*static*/ void Generic_GCC::GCCInstallationDetector::CollectLibDirsAndTriples(
1839     const llvm::Triple &TargetTriple, const llvm::Triple &BiarchTriple,
1840     SmallVectorImpl<StringRef> &LibDirs,
1841     SmallVectorImpl<StringRef> &TripleAliases,
1842     SmallVectorImpl<StringRef> &BiarchLibDirs,
1843     SmallVectorImpl<StringRef> &BiarchTripleAliases) {
1844   // Declare a bunch of static data sets that we'll select between below. These
1845   // are specifically designed to always refer to string literals to avoid any
1846   // lifetime or initialization issues.
1847   static const char *const AArch64LibDirs[] = {"/lib64", "/lib"};
1848   static const char *const AArch64Triples[] = {
1849       "aarch64-none-linux-gnu", "aarch64-linux-gnu", "aarch64-redhat-linux",
1850       "aarch64-suse-linux", "aarch64-linux-android"};
1851   static const char *const AArch64beLibDirs[] = {"/lib"};
1852   static const char *const AArch64beTriples[] = {"aarch64_be-none-linux-gnu",
1853                                                  "aarch64_be-linux-gnu"};
1854 
1855   static const char *const ARMLibDirs[] = {"/lib"};
1856   static const char *const ARMTriples[] = {"arm-linux-gnueabi",
1857                                            "arm-linux-androideabi"};
1858   static const char *const ARMHFTriples[] = {"arm-linux-gnueabihf",
1859                                              "armv7hl-redhat-linux-gnueabi",
1860                                              "armv6hl-suse-linux-gnueabi",
1861                                              "armv7hl-suse-linux-gnueabi"};
1862   static const char *const ARMebLibDirs[] = {"/lib"};
1863   static const char *const ARMebTriples[] = {"armeb-linux-gnueabi",
1864                                              "armeb-linux-androideabi"};
1865   static const char *const ARMebHFTriples[] = {
1866       "armeb-linux-gnueabihf", "armebv7hl-redhat-linux-gnueabi"};
1867 
1868   static const char *const X86_64LibDirs[] = {"/lib64", "/lib"};
1869   static const char *const X86_64Triples[] = {
1870       "x86_64-linux-gnu",       "x86_64-unknown-linux-gnu",
1871       "x86_64-pc-linux-gnu",    "x86_64-redhat-linux6E",
1872       "x86_64-redhat-linux",    "x86_64-suse-linux",
1873       "x86_64-manbo-linux-gnu", "x86_64-linux-gnu",
1874       "x86_64-slackware-linux", "x86_64-unknown-linux",
1875       "x86_64-amazon-linux",    "x86_64-linux-android"};
1876   static const char *const X32LibDirs[] = {"/libx32"};
1877   static const char *const X86LibDirs[] = {"/lib32", "/lib"};
1878   static const char *const X86Triples[] = {
1879       "i686-linux-gnu",       "i686-pc-linux-gnu",     "i486-linux-gnu",
1880       "i386-linux-gnu",       "i386-redhat-linux6E",   "i686-redhat-linux",
1881       "i586-redhat-linux",    "i386-redhat-linux",     "i586-suse-linux",
1882       "i486-slackware-linux", "i686-montavista-linux", "i586-linux-gnu",
1883       "i686-linux-android"};
1884 
1885   static const char *const MIPSLibDirs[] = {"/lib"};
1886   static const char *const MIPSTriples[] = {
1887       "mips-linux-gnu", "mips-mti-linux", "mips-mti-linux-gnu",
1888       "mips-img-linux-gnu", "mipsisa32r6-linux-gnu"};
1889   static const char *const MIPSELLibDirs[] = {"/lib"};
1890   static const char *const MIPSELTriples[] = {
1891       "mipsel-linux-gnu", "mips-img-linux-gnu", "mipsisa32r6el-linux-gnu",
1892       "mipsel-linux-android"};
1893 
1894   static const char *const MIPS64LibDirs[] = {"/lib64", "/lib"};
1895   static const char *const MIPS64Triples[] = {
1896       "mips64-linux-gnu",      "mips-mti-linux-gnu",
1897       "mips-img-linux-gnu",    "mips64-linux-gnuabi64",
1898       "mipsisa64r6-linux-gnu", "mipsisa64r6-linux-gnuabi64"};
1899   static const char *const MIPS64ELLibDirs[] = {"/lib64", "/lib"};
1900   static const char *const MIPS64ELTriples[] = {
1901       "mips64el-linux-gnu",      "mips-mti-linux-gnu",
1902       "mips-img-linux-gnu",      "mips64el-linux-gnuabi64",
1903       "mipsisa64r6el-linux-gnu", "mipsisa64r6el-linux-gnuabi64",
1904       "mips64el-linux-android"};
1905 
1906   static const char *const MIPSN32LibDirs[] = {"/lib32"};
1907   static const char *const MIPSN32Triples[] = {"mips64-linux-gnuabin32",
1908                                                "mipsisa64r6-linux-gnuabin32"};
1909   static const char *const MIPSN32ELLibDirs[] = {"/lib32"};
1910   static const char *const MIPSN32ELTriples[] = {
1911       "mips64el-linux-gnuabin32", "mipsisa64r6el-linux-gnuabin32"};
1912 
1913   static const char *const PPCLibDirs[] = {"/lib32", "/lib"};
1914   static const char *const PPCTriples[] = {
1915       "powerpc-linux-gnu", "powerpc-unknown-linux-gnu", "powerpc-linux-gnuspe",
1916       "powerpc-suse-linux", "powerpc-montavista-linuxspe"};
1917   static const char *const PPC64LibDirs[] = {"/lib64", "/lib"};
1918   static const char *const PPC64Triples[] = {
1919       "powerpc64-linux-gnu", "powerpc64-unknown-linux-gnu",
1920       "powerpc64-suse-linux", "ppc64-redhat-linux"};
1921   static const char *const PPC64LELibDirs[] = {"/lib64", "/lib"};
1922   static const char *const PPC64LETriples[] = {
1923       "powerpc64le-linux-gnu", "powerpc64le-unknown-linux-gnu",
1924       "powerpc64le-suse-linux", "ppc64le-redhat-linux"};
1925 
1926   static const char *const RISCV32LibDirs[] = {"/lib", "/lib32"};
1927   static const char *const RISCVTriples[] = {"riscv32-unknown-linux-gnu",
1928                                              "riscv64-unknown-linux-gnu",
1929                                              "riscv32-unknown-elf"};
1930 
1931   static const char *const SPARCv8LibDirs[] = {"/lib32", "/lib"};
1932   static const char *const SPARCv8Triples[] = {"sparc-linux-gnu",
1933                                                "sparcv8-linux-gnu"};
1934   static const char *const SPARCv9LibDirs[] = {"/lib64", "/lib"};
1935   static const char *const SPARCv9Triples[] = {"sparc64-linux-gnu",
1936                                                "sparcv9-linux-gnu"};
1937 
1938   static const char *const SystemZLibDirs[] = {"/lib64", "/lib"};
1939   static const char *const SystemZTriples[] = {
1940       "s390x-linux-gnu", "s390x-unknown-linux-gnu", "s390x-ibm-linux-gnu",
1941       "s390x-suse-linux", "s390x-redhat-linux"};
1942 
1943 
1944   using std::begin;
1945   using std::end;
1946 
1947   if (TargetTriple.getOS() == llvm::Triple::Solaris) {
1948     static const char *const SolarisLibDirs[] = {"/lib"};
1949     static const char *const SolarisSparcV8Triples[] = {
1950         "sparc-sun-solaris2.11", "sparc-sun-solaris2.12"};
1951     static const char *const SolarisSparcV9Triples[] = {
1952         "sparcv9-sun-solaris2.11", "sparcv9-sun-solaris2.12"};
1953     static const char *const SolarisX86Triples[] = {"i386-pc-solaris2.11",
1954                                                     "i386-pc-solaris2.12"};
1955     static const char *const SolarisX86_64Triples[] = {"x86_64-pc-solaris2.11",
1956                                                        "x86_64-pc-solaris2.12"};
1957     LibDirs.append(begin(SolarisLibDirs), end(SolarisLibDirs));
1958     BiarchLibDirs.append(begin(SolarisLibDirs), end(SolarisLibDirs));
1959     switch (TargetTriple.getArch()) {
1960     case llvm::Triple::x86:
1961       TripleAliases.append(begin(SolarisX86Triples), end(SolarisX86Triples));
1962       BiarchTripleAliases.append(begin(SolarisX86_64Triples),
1963                                  end(SolarisX86_64Triples));
1964       break;
1965     case llvm::Triple::x86_64:
1966       TripleAliases.append(begin(SolarisX86_64Triples),
1967                            end(SolarisX86_64Triples));
1968       BiarchTripleAliases.append(begin(SolarisX86Triples),
1969                                  end(SolarisX86Triples));
1970       break;
1971     case llvm::Triple::sparc:
1972       TripleAliases.append(begin(SolarisSparcV8Triples),
1973                            end(SolarisSparcV8Triples));
1974       BiarchTripleAliases.append(begin(SolarisSparcV9Triples),
1975                                  end(SolarisSparcV9Triples));
1976       break;
1977     case llvm::Triple::sparcv9:
1978       TripleAliases.append(begin(SolarisSparcV9Triples),
1979                            end(SolarisSparcV9Triples));
1980       BiarchTripleAliases.append(begin(SolarisSparcV8Triples),
1981                                  end(SolarisSparcV8Triples));
1982       break;
1983     default:
1984       break;
1985     }
1986     return;
1987   }
1988 
1989   // Android targets should not use GNU/Linux tools or libraries.
1990   if (TargetTriple.isAndroid()) {
1991     static const char *const AArch64AndroidTriples[] = {
1992         "aarch64-linux-android"};
1993     static const char *const ARMAndroidTriples[] = {"arm-linux-androideabi"};
1994     static const char *const MIPSELAndroidTriples[] = {"mipsel-linux-android"};
1995     static const char *const MIPS64ELAndroidTriples[] = {
1996         "mips64el-linux-android"};
1997     static const char *const X86AndroidTriples[] = {"i686-linux-android"};
1998     static const char *const X86_64AndroidTriples[] = {"x86_64-linux-android"};
1999 
2000     switch (TargetTriple.getArch()) {
2001     case llvm::Triple::aarch64:
2002       LibDirs.append(begin(AArch64LibDirs), end(AArch64LibDirs));
2003       TripleAliases.append(begin(AArch64AndroidTriples),
2004                            end(AArch64AndroidTriples));
2005       break;
2006     case llvm::Triple::arm:
2007     case llvm::Triple::thumb:
2008       LibDirs.append(begin(ARMLibDirs), end(ARMLibDirs));
2009       TripleAliases.append(begin(ARMAndroidTriples), end(ARMAndroidTriples));
2010       break;
2011     case llvm::Triple::mipsel:
2012       LibDirs.append(begin(MIPSELLibDirs), end(MIPSELLibDirs));
2013       TripleAliases.append(begin(MIPSELAndroidTriples),
2014                            end(MIPSELAndroidTriples));
2015       BiarchLibDirs.append(begin(MIPS64ELLibDirs), end(MIPS64ELLibDirs));
2016       BiarchTripleAliases.append(begin(MIPS64ELAndroidTriples),
2017                                  end(MIPS64ELAndroidTriples));
2018       break;
2019     case llvm::Triple::mips64el:
2020       LibDirs.append(begin(MIPS64ELLibDirs), end(MIPS64ELLibDirs));
2021       TripleAliases.append(begin(MIPS64ELAndroidTriples),
2022                            end(MIPS64ELAndroidTriples));
2023       BiarchLibDirs.append(begin(MIPSELLibDirs), end(MIPSELLibDirs));
2024       BiarchTripleAliases.append(begin(MIPSELAndroidTriples),
2025                                  end(MIPSELAndroidTriples));
2026       break;
2027     case llvm::Triple::x86_64:
2028       LibDirs.append(begin(X86_64LibDirs), end(X86_64LibDirs));
2029       TripleAliases.append(begin(X86_64AndroidTriples),
2030                            end(X86_64AndroidTriples));
2031       BiarchLibDirs.append(begin(X86LibDirs), end(X86LibDirs));
2032       BiarchTripleAliases.append(begin(X86AndroidTriples),
2033                                  end(X86AndroidTriples));
2034       break;
2035     case llvm::Triple::x86:
2036       LibDirs.append(begin(X86LibDirs), end(X86LibDirs));
2037       TripleAliases.append(begin(X86AndroidTriples), end(X86AndroidTriples));
2038       BiarchLibDirs.append(begin(X86_64LibDirs), end(X86_64LibDirs));
2039       BiarchTripleAliases.append(begin(X86_64AndroidTriples),
2040                                  end(X86_64AndroidTriples));
2041       break;
2042     default:
2043       break;
2044     }
2045 
2046     return;
2047   }
2048 
2049   switch (TargetTriple.getArch()) {
2050   case llvm::Triple::aarch64:
2051     LibDirs.append(begin(AArch64LibDirs), end(AArch64LibDirs));
2052     TripleAliases.append(begin(AArch64Triples), end(AArch64Triples));
2053     BiarchLibDirs.append(begin(AArch64LibDirs), end(AArch64LibDirs));
2054     BiarchTripleAliases.append(begin(AArch64Triples), end(AArch64Triples));
2055     break;
2056   case llvm::Triple::aarch64_be:
2057     LibDirs.append(begin(AArch64beLibDirs), end(AArch64beLibDirs));
2058     TripleAliases.append(begin(AArch64beTriples), end(AArch64beTriples));
2059     BiarchLibDirs.append(begin(AArch64beLibDirs), end(AArch64beLibDirs));
2060     BiarchTripleAliases.append(begin(AArch64beTriples), end(AArch64beTriples));
2061     break;
2062   case llvm::Triple::arm:
2063   case llvm::Triple::thumb:
2064     LibDirs.append(begin(ARMLibDirs), end(ARMLibDirs));
2065     if (TargetTriple.getEnvironment() == llvm::Triple::GNUEABIHF) {
2066       TripleAliases.append(begin(ARMHFTriples), end(ARMHFTriples));
2067     } else {
2068       TripleAliases.append(begin(ARMTriples), end(ARMTriples));
2069     }
2070     break;
2071   case llvm::Triple::armeb:
2072   case llvm::Triple::thumbeb:
2073     LibDirs.append(begin(ARMebLibDirs), end(ARMebLibDirs));
2074     if (TargetTriple.getEnvironment() == llvm::Triple::GNUEABIHF) {
2075       TripleAliases.append(begin(ARMebHFTriples), end(ARMebHFTriples));
2076     } else {
2077       TripleAliases.append(begin(ARMebTriples), end(ARMebTriples));
2078     }
2079     break;
2080   case llvm::Triple::x86_64:
2081     LibDirs.append(begin(X86_64LibDirs), end(X86_64LibDirs));
2082     TripleAliases.append(begin(X86_64Triples), end(X86_64Triples));
2083     // x32 is always available when x86_64 is available, so adding it as
2084     // secondary arch with x86_64 triples
2085     if (TargetTriple.getEnvironment() == llvm::Triple::GNUX32) {
2086       BiarchLibDirs.append(begin(X32LibDirs), end(X32LibDirs));
2087       BiarchTripleAliases.append(begin(X86_64Triples), end(X86_64Triples));
2088     } else {
2089       BiarchLibDirs.append(begin(X86LibDirs), end(X86LibDirs));
2090       BiarchTripleAliases.append(begin(X86Triples), end(X86Triples));
2091     }
2092     break;
2093   case llvm::Triple::x86:
2094     LibDirs.append(begin(X86LibDirs), end(X86LibDirs));
2095     // MCU toolchain is 32 bit only and its triple alias is TargetTriple
2096     // itself, which will be appended below.
2097     if (!TargetTriple.isOSIAMCU()) {
2098       TripleAliases.append(begin(X86Triples), end(X86Triples));
2099       BiarchLibDirs.append(begin(X86_64LibDirs), end(X86_64LibDirs));
2100       BiarchTripleAliases.append(begin(X86_64Triples), end(X86_64Triples));
2101     }
2102     break;
2103   case llvm::Triple::mips:
2104     LibDirs.append(begin(MIPSLibDirs), end(MIPSLibDirs));
2105     TripleAliases.append(begin(MIPSTriples), end(MIPSTriples));
2106     BiarchLibDirs.append(begin(MIPS64LibDirs), end(MIPS64LibDirs));
2107     BiarchTripleAliases.append(begin(MIPS64Triples), end(MIPS64Triples));
2108     BiarchLibDirs.append(begin(MIPSN32LibDirs), end(MIPSN32LibDirs));
2109     BiarchTripleAliases.append(begin(MIPSN32Triples), end(MIPSN32Triples));
2110     break;
2111   case llvm::Triple::mipsel:
2112     LibDirs.append(begin(MIPSELLibDirs), end(MIPSELLibDirs));
2113     TripleAliases.append(begin(MIPSELTriples), end(MIPSELTriples));
2114     TripleAliases.append(begin(MIPSTriples), end(MIPSTriples));
2115     BiarchLibDirs.append(begin(MIPS64ELLibDirs), end(MIPS64ELLibDirs));
2116     BiarchTripleAliases.append(begin(MIPS64ELTriples), end(MIPS64ELTriples));
2117     BiarchLibDirs.append(begin(MIPSN32ELLibDirs), end(MIPSN32ELLibDirs));
2118     BiarchTripleAliases.append(begin(MIPSN32ELTriples), end(MIPSN32ELTriples));
2119     break;
2120   case llvm::Triple::mips64:
2121     LibDirs.append(begin(MIPS64LibDirs), end(MIPS64LibDirs));
2122     TripleAliases.append(begin(MIPS64Triples), end(MIPS64Triples));
2123     BiarchLibDirs.append(begin(MIPSLibDirs), end(MIPSLibDirs));
2124     BiarchTripleAliases.append(begin(MIPSTriples), end(MIPSTriples));
2125     BiarchLibDirs.append(begin(MIPSN32LibDirs), end(MIPSN32LibDirs));
2126     BiarchTripleAliases.append(begin(MIPSN32Triples), end(MIPSN32Triples));
2127     break;
2128   case llvm::Triple::mips64el:
2129     LibDirs.append(begin(MIPS64ELLibDirs), end(MIPS64ELLibDirs));
2130     TripleAliases.append(begin(MIPS64ELTriples), end(MIPS64ELTriples));
2131     BiarchLibDirs.append(begin(MIPSELLibDirs), end(MIPSELLibDirs));
2132     BiarchTripleAliases.append(begin(MIPSELTriples), end(MIPSELTriples));
2133     BiarchLibDirs.append(begin(MIPSN32ELLibDirs), end(MIPSN32ELLibDirs));
2134     BiarchTripleAliases.append(begin(MIPSN32ELTriples), end(MIPSN32ELTriples));
2135     BiarchTripleAliases.append(begin(MIPSTriples), end(MIPSTriples));
2136     break;
2137   case llvm::Triple::ppc:
2138     LibDirs.append(begin(PPCLibDirs), end(PPCLibDirs));
2139     TripleAliases.append(begin(PPCTriples), end(PPCTriples));
2140     BiarchLibDirs.append(begin(PPC64LibDirs), end(PPC64LibDirs));
2141     BiarchTripleAliases.append(begin(PPC64Triples), end(PPC64Triples));
2142     break;
2143   case llvm::Triple::ppc64:
2144     LibDirs.append(begin(PPC64LibDirs), end(PPC64LibDirs));
2145     TripleAliases.append(begin(PPC64Triples), end(PPC64Triples));
2146     BiarchLibDirs.append(begin(PPCLibDirs), end(PPCLibDirs));
2147     BiarchTripleAliases.append(begin(PPCTriples), end(PPCTriples));
2148     break;
2149   case llvm::Triple::ppc64le:
2150     LibDirs.append(begin(PPC64LELibDirs), end(PPC64LELibDirs));
2151     TripleAliases.append(begin(PPC64LETriples), end(PPC64LETriples));
2152     break;
2153   case llvm::Triple::riscv32:
2154     LibDirs.append(begin(RISCV32LibDirs), end(RISCV32LibDirs));
2155     BiarchLibDirs.append(begin(RISCV32LibDirs), end(RISCV32LibDirs));
2156     TripleAliases.append(begin(RISCVTriples), end(RISCVTriples));
2157     BiarchTripleAliases.append(begin(RISCVTriples), end(RISCVTriples));
2158     break;
2159   case llvm::Triple::sparc:
2160   case llvm::Triple::sparcel:
2161     LibDirs.append(begin(SPARCv8LibDirs), end(SPARCv8LibDirs));
2162     TripleAliases.append(begin(SPARCv8Triples), end(SPARCv8Triples));
2163     BiarchLibDirs.append(begin(SPARCv9LibDirs), end(SPARCv9LibDirs));
2164     BiarchTripleAliases.append(begin(SPARCv9Triples), end(SPARCv9Triples));
2165     break;
2166   case llvm::Triple::sparcv9:
2167     LibDirs.append(begin(SPARCv9LibDirs), end(SPARCv9LibDirs));
2168     TripleAliases.append(begin(SPARCv9Triples), end(SPARCv9Triples));
2169     BiarchLibDirs.append(begin(SPARCv8LibDirs), end(SPARCv8LibDirs));
2170     BiarchTripleAliases.append(begin(SPARCv8Triples), end(SPARCv8Triples));
2171     break;
2172   case llvm::Triple::systemz:
2173     LibDirs.append(begin(SystemZLibDirs), end(SystemZLibDirs));
2174     TripleAliases.append(begin(SystemZTriples), end(SystemZTriples));
2175     break;
2176   default:
2177     // By default, just rely on the standard lib directories and the original
2178     // triple.
2179     break;
2180   }
2181 
2182   // Always append the drivers target triple to the end, in case it doesn't
2183   // match any of our aliases.
2184   TripleAliases.push_back(TargetTriple.str());
2185 
2186   // Also include the multiarch variant if it's different.
2187   if (TargetTriple.str() != BiarchTriple.str())
2188     BiarchTripleAliases.push_back(BiarchTriple.str());
2189 }
2190 
2191 bool Generic_GCC::GCCInstallationDetector::ScanGCCForMultilibs(
2192     const llvm::Triple &TargetTriple, const ArgList &Args,
2193     StringRef Path, bool NeedsBiarchSuffix) {
2194   llvm::Triple::ArchType TargetArch = TargetTriple.getArch();
2195   DetectedMultilibs Detected;
2196 
2197   // Android standalone toolchain could have multilibs for ARM and Thumb.
2198   // Debian mips multilibs behave more like the rest of the biarch ones,
2199   // so handle them there
2200   if (isArmOrThumbArch(TargetArch) && TargetTriple.isAndroid()) {
2201     // It should also work without multilibs in a simplified toolchain.
2202     findAndroidArmMultilibs(D, TargetTriple, Path, Args, Detected);
2203   } else if (TargetTriple.isMIPS()) {
2204     if (!findMIPSMultilibs(D, TargetTriple, Path, Args, Detected))
2205       return false;
2206   } else if (isRISCV(TargetArch)) {
2207     findRISCVMultilibs(D, TargetTriple, Path, Args, Detected);
2208   } else if (!findBiarchMultilibs(D, TargetTriple, Path, Args,
2209                                   NeedsBiarchSuffix, Detected)) {
2210     return false;
2211   }
2212 
2213   Multilibs = Detected.Multilibs;
2214   SelectedMultilib = Detected.SelectedMultilib;
2215   BiarchSibling = Detected.BiarchSibling;
2216 
2217   return true;
2218 }
2219 
2220 void Generic_GCC::GCCInstallationDetector::ScanLibDirForGCCTriple(
2221     const llvm::Triple &TargetTriple, const ArgList &Args,
2222     const std::string &LibDir, StringRef CandidateTriple,
2223     bool NeedsBiarchSuffix) {
2224   llvm::Triple::ArchType TargetArch = TargetTriple.getArch();
2225   // Locations relative to the system lib directory where GCC's triple-specific
2226   // directories might reside.
2227   struct GCCLibSuffix {
2228     // Path from system lib directory to GCC triple-specific directory.
2229     std::string LibSuffix;
2230     // Path from GCC triple-specific directory back to system lib directory.
2231     // This is one '..' component per component in LibSuffix.
2232     StringRef ReversePath;
2233     // Whether this library suffix is relevant for the triple.
2234     bool Active;
2235   } Suffixes[] = {
2236       // This is the normal place.
2237       {"gcc/" + CandidateTriple.str(), "../..", true},
2238 
2239       // Debian puts cross-compilers in gcc-cross.
2240       {"gcc-cross/" + CandidateTriple.str(), "../..",
2241        TargetTriple.getOS() != llvm::Triple::Solaris},
2242 
2243       // The Freescale PPC SDK has the gcc libraries in
2244       // <sysroot>/usr/lib/<triple>/x.y.z so have a look there as well. Only do
2245       // this on Freescale triples, though, since some systems put a *lot* of
2246       // files in that location, not just GCC installation data.
2247       {CandidateTriple.str(), "..",
2248        TargetTriple.getVendor() == llvm::Triple::Freescale ||
2249        TargetTriple.getVendor() == llvm::Triple::OpenEmbedded},
2250 
2251       // Natively multiarch systems sometimes put the GCC triple-specific
2252       // directory within their multiarch lib directory, resulting in the
2253       // triple appearing twice.
2254       {CandidateTriple.str() + "/gcc/" + CandidateTriple.str(), "../../..",
2255        TargetTriple.getOS() != llvm::Triple::Solaris},
2256 
2257       // Deal with cases (on Ubuntu) where the system architecture could be i386
2258       // but the GCC target architecture could be (say) i686.
2259       // FIXME: It may be worthwhile to generalize this and look for a second
2260       // triple.
2261       {"i386-linux-gnu/gcc/" + CandidateTriple.str(), "../../..",
2262        (TargetArch == llvm::Triple::x86 &&
2263         TargetTriple.getOS() != llvm::Triple::Solaris)}};
2264 
2265   for (auto &Suffix : Suffixes) {
2266     if (!Suffix.Active)
2267       continue;
2268 
2269     StringRef LibSuffix = Suffix.LibSuffix;
2270     std::error_code EC;
2271     for (llvm::vfs::directory_iterator
2272              LI = D.getVFS().dir_begin(LibDir + "/" + LibSuffix, EC),
2273              LE;
2274          !EC && LI != LE; LI = LI.increment(EC)) {
2275       StringRef VersionText = llvm::sys::path::filename(LI->path());
2276       GCCVersion CandidateVersion = GCCVersion::Parse(VersionText);
2277       if (CandidateVersion.Major != -1) // Filter obviously bad entries.
2278         if (!CandidateGCCInstallPaths.insert(LI->path()).second)
2279           continue; // Saw this path before; no need to look at it again.
2280       if (CandidateVersion.isOlderThan(4, 1, 1))
2281         continue;
2282       if (CandidateVersion <= Version)
2283         continue;
2284 
2285       if (!ScanGCCForMultilibs(TargetTriple, Args, LI->path(),
2286                                NeedsBiarchSuffix))
2287         continue;
2288 
2289       Version = CandidateVersion;
2290       GCCTriple.setTriple(CandidateTriple);
2291       // FIXME: We hack together the directory name here instead of
2292       // using LI to ensure stable path separators across Windows and
2293       // Linux.
2294       GCCInstallPath = (LibDir + "/" + LibSuffix + "/" + VersionText).str();
2295       GCCParentLibPath = (GCCInstallPath + "/../" + Suffix.ReversePath).str();
2296       IsValid = true;
2297     }
2298   }
2299 }
2300 
2301 bool Generic_GCC::GCCInstallationDetector::ScanGentooConfigs(
2302     const llvm::Triple &TargetTriple, const ArgList &Args,
2303     const SmallVectorImpl<StringRef> &CandidateTriples,
2304     const SmallVectorImpl<StringRef> &CandidateBiarchTriples) {
2305   for (StringRef CandidateTriple : CandidateTriples) {
2306     if (ScanGentooGccConfig(TargetTriple, Args, CandidateTriple))
2307       return true;
2308   }
2309 
2310   for (StringRef CandidateTriple : CandidateBiarchTriples) {
2311     if (ScanGentooGccConfig(TargetTriple, Args, CandidateTriple, true))
2312       return true;
2313   }
2314   return false;
2315 }
2316 
2317 bool Generic_GCC::GCCInstallationDetector::ScanGentooGccConfig(
2318     const llvm::Triple &TargetTriple, const ArgList &Args,
2319     StringRef CandidateTriple, bool NeedsBiarchSuffix) {
2320   llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> File =
2321       D.getVFS().getBufferForFile(D.SysRoot + "/etc/env.d/gcc/config-" +
2322                                   CandidateTriple.str());
2323   if (File) {
2324     SmallVector<StringRef, 2> Lines;
2325     File.get()->getBuffer().split(Lines, "\n");
2326     for (StringRef Line : Lines) {
2327       Line = Line.trim();
2328       // CURRENT=triple-version
2329       if (!Line.consume_front("CURRENT="))
2330         continue;
2331       // Process the config file pointed to by CURRENT.
2332       llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> ConfigFile =
2333           D.getVFS().getBufferForFile(D.SysRoot + "/etc/env.d/gcc/" +
2334                                       Line.str());
2335       std::pair<StringRef, StringRef> ActiveVersion = Line.rsplit('-');
2336       // List of paths to scan for libraries.
2337       SmallVector<StringRef, 4> GentooScanPaths;
2338       // Scan the Config file to find installed GCC libraries path.
2339       // Typical content of the GCC config file:
2340       // LDPATH="/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.x:/usr/lib/gcc/
2341       // (continued from previous line) x86_64-pc-linux-gnu/4.9.x/32"
2342       // MANPATH="/usr/share/gcc-data/x86_64-pc-linux-gnu/4.9.x/man"
2343       // INFOPATH="/usr/share/gcc-data/x86_64-pc-linux-gnu/4.9.x/info"
2344       // STDCXX_INCDIR="/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.x/include/g++-v4"
2345       // We are looking for the paths listed in LDPATH=... .
2346       if (ConfigFile) {
2347         SmallVector<StringRef, 2> ConfigLines;
2348         ConfigFile.get()->getBuffer().split(ConfigLines, "\n");
2349         for (StringRef ConfLine : ConfigLines) {
2350           ConfLine = ConfLine.trim();
2351           if (ConfLine.consume_front("LDPATH=")) {
2352             // Drop '"' from front and back if present.
2353             ConfLine.consume_back("\"");
2354             ConfLine.consume_front("\"");
2355             // Get all paths sperated by ':'
2356             ConfLine.split(GentooScanPaths, ':', -1, /*AllowEmpty*/ false);
2357           }
2358         }
2359       }
2360       // Test the path based on the version in /etc/env.d/gcc/config-{tuple}.
2361       std::string basePath = "/usr/lib/gcc/" + ActiveVersion.first.str() + "/"
2362           + ActiveVersion.second.str();
2363       GentooScanPaths.push_back(StringRef(basePath));
2364 
2365       // Scan all paths for GCC libraries.
2366       for (const auto &GentooScanPath : GentooScanPaths) {
2367         std::string GentooPath = D.SysRoot + std::string(GentooScanPath);
2368         if (D.getVFS().exists(GentooPath + "/crtbegin.o")) {
2369           if (!ScanGCCForMultilibs(TargetTriple, Args, GentooPath,
2370                                    NeedsBiarchSuffix))
2371             continue;
2372 
2373           Version = GCCVersion::Parse(ActiveVersion.second);
2374           GCCInstallPath = GentooPath;
2375           GCCParentLibPath = GentooPath + std::string("/../../..");
2376           GCCTriple.setTriple(ActiveVersion.first);
2377           IsValid = true;
2378           return true;
2379         }
2380       }
2381     }
2382   }
2383 
2384   return false;
2385 }
2386 
2387 Generic_GCC::Generic_GCC(const Driver &D, const llvm::Triple &Triple,
2388                          const ArgList &Args)
2389     : ToolChain(D, Triple, Args), GCCInstallation(D),
2390       CudaInstallation(D, Triple, Args) {
2391   getProgramPaths().push_back(getDriver().getInstalledDir());
2392   if (getDriver().getInstalledDir() != getDriver().Dir)
2393     getProgramPaths().push_back(getDriver().Dir);
2394 }
2395 
2396 Generic_GCC::~Generic_GCC() {}
2397 
2398 Tool *Generic_GCC::getTool(Action::ActionClass AC) const {
2399   switch (AC) {
2400   case Action::PreprocessJobClass:
2401     if (!Preprocess)
2402       Preprocess.reset(new clang::driver::tools::gcc::Preprocessor(*this));
2403     return Preprocess.get();
2404   case Action::CompileJobClass:
2405     if (!Compile)
2406       Compile.reset(new tools::gcc::Compiler(*this));
2407     return Compile.get();
2408   default:
2409     return ToolChain::getTool(AC);
2410   }
2411 }
2412 
2413 Tool *Generic_GCC::buildAssembler() const {
2414   return new tools::gnutools::Assembler(*this);
2415 }
2416 
2417 Tool *Generic_GCC::buildLinker() const { return new tools::gcc::Linker(*this); }
2418 
2419 void Generic_GCC::printVerboseInfo(raw_ostream &OS) const {
2420   // Print the information about how we detected the GCC installation.
2421   GCCInstallation.print(OS);
2422   CudaInstallation.print(OS);
2423 }
2424 
2425 bool Generic_GCC::IsUnwindTablesDefault(const ArgList &Args) const {
2426   return getArch() == llvm::Triple::x86_64;
2427 }
2428 
2429 bool Generic_GCC::isPICDefault() const {
2430   switch (getArch()) {
2431   case llvm::Triple::x86_64:
2432     return getTriple().isOSWindows();
2433   case llvm::Triple::ppc64:
2434   case llvm::Triple::ppc64le:
2435     return !getTriple().isOSBinFormatMachO() && !getTriple().isMacOSX();
2436   case llvm::Triple::mips64:
2437   case llvm::Triple::mips64el:
2438     return true;
2439   default:
2440     return false;
2441   }
2442 }
2443 
2444 bool Generic_GCC::isPIEDefault() const { return false; }
2445 
2446 bool Generic_GCC::isPICDefaultForced() const {
2447   return getArch() == llvm::Triple::x86_64 && getTriple().isOSWindows();
2448 }
2449 
2450 bool Generic_GCC::IsIntegratedAssemblerDefault() const {
2451   switch (getTriple().getArch()) {
2452   case llvm::Triple::x86:
2453   case llvm::Triple::x86_64:
2454   case llvm::Triple::aarch64:
2455   case llvm::Triple::aarch64_be:
2456   case llvm::Triple::arm:
2457   case llvm::Triple::armeb:
2458   case llvm::Triple::avr:
2459   case llvm::Triple::bpfel:
2460   case llvm::Triple::bpfeb:
2461   case llvm::Triple::thumb:
2462   case llvm::Triple::thumbeb:
2463   case llvm::Triple::ppc:
2464   case llvm::Triple::ppc64:
2465   case llvm::Triple::ppc64le:
2466   case llvm::Triple::riscv32:
2467   case llvm::Triple::riscv64:
2468   case llvm::Triple::systemz:
2469   case llvm::Triple::mips:
2470   case llvm::Triple::mipsel:
2471     return true;
2472   case llvm::Triple::mips64:
2473   case llvm::Triple::mips64el:
2474     // Enabled for Debian, Android, FreeBSD and OpenBSD mips64/mipsel, as they
2475     // can precisely identify the ABI in use (Debian) or only use N64 for MIPS64
2476     // (Android). Other targets are unable to distinguish N32 from N64.
2477     if (getTriple().getEnvironment() == llvm::Triple::GNUABI64 ||
2478         getTriple().isAndroid() ||
2479         getTriple().isOSFreeBSD() ||
2480         getTriple().isOSOpenBSD())
2481       return true;
2482     return false;
2483   default:
2484     return false;
2485   }
2486 }
2487 
2488 void Generic_GCC::AddClangCXXStdlibIncludeArgs(const ArgList &DriverArgs,
2489                                                ArgStringList &CC1Args) const {
2490   if (DriverArgs.hasArg(options::OPT_nostdlibinc) ||
2491       DriverArgs.hasArg(options::OPT_nostdincxx))
2492     return;
2493 
2494   switch (GetCXXStdlibType(DriverArgs)) {
2495   case ToolChain::CST_Libcxx:
2496     addLibCxxIncludePaths(DriverArgs, CC1Args);
2497     break;
2498 
2499   case ToolChain::CST_Libstdcxx:
2500     addLibStdCxxIncludePaths(DriverArgs, CC1Args);
2501     break;
2502   }
2503 }
2504 
2505 void
2506 Generic_GCC::addLibCxxIncludePaths(const llvm::opt::ArgList &DriverArgs,
2507                                    llvm::opt::ArgStringList &CC1Args) const {
2508   // FIXME: The Linux behavior would probaby be a better approach here.
2509   addSystemInclude(DriverArgs, CC1Args,
2510                    getDriver().SysRoot + "/usr/include/c++/v1");
2511 }
2512 
2513 void
2514 Generic_GCC::addLibStdCxxIncludePaths(const llvm::opt::ArgList &DriverArgs,
2515                                       llvm::opt::ArgStringList &CC1Args) const {
2516   // By default, we don't assume we know where libstdc++ might be installed.
2517   // FIXME: If we have a valid GCCInstallation, use it.
2518 }
2519 
2520 /// Helper to add the variant paths of a libstdc++ installation.
2521 bool Generic_GCC::addLibStdCXXIncludePaths(
2522     Twine Base, Twine Suffix, StringRef GCCTriple, StringRef GCCMultiarchTriple,
2523     StringRef TargetMultiarchTriple, Twine IncludeSuffix,
2524     const ArgList &DriverArgs, ArgStringList &CC1Args) const {
2525   if (!getVFS().exists(Base + Suffix))
2526     return false;
2527 
2528   addSystemInclude(DriverArgs, CC1Args, Base + Suffix);
2529 
2530   // The vanilla GCC layout of libstdc++ headers uses a triple subdirectory. If
2531   // that path exists or we have neither a GCC nor target multiarch triple, use
2532   // this vanilla search path.
2533   if ((GCCMultiarchTriple.empty() && TargetMultiarchTriple.empty()) ||
2534       getVFS().exists(Base + Suffix + "/" + GCCTriple + IncludeSuffix)) {
2535     addSystemInclude(DriverArgs, CC1Args,
2536                      Base + Suffix + "/" + GCCTriple + IncludeSuffix);
2537   } else {
2538     // Otherwise try to use multiarch naming schemes which have normalized the
2539     // triples and put the triple before the suffix.
2540     //
2541     // GCC surprisingly uses *both* the GCC triple with a multilib suffix and
2542     // the target triple, so we support that here.
2543     addSystemInclude(DriverArgs, CC1Args,
2544                      Base + "/" + GCCMultiarchTriple + Suffix + IncludeSuffix);
2545     addSystemInclude(DriverArgs, CC1Args,
2546                      Base + "/" + TargetMultiarchTriple + Suffix);
2547   }
2548 
2549   addSystemInclude(DriverArgs, CC1Args, Base + Suffix + "/backward");
2550   return true;
2551 }
2552 
2553 llvm::opt::DerivedArgList *
2554 Generic_GCC::TranslateArgs(const llvm::opt::DerivedArgList &Args, StringRef,
2555                            Action::OffloadKind DeviceOffloadKind) const {
2556 
2557   // If this tool chain is used for an OpenMP offloading device we have to make
2558   // sure we always generate a shared library regardless of the commands the
2559   // user passed to the host. This is required because the runtime library
2560   // is required to load the device image dynamically at run time.
2561   if (DeviceOffloadKind == Action::OFK_OpenMP) {
2562     DerivedArgList *DAL = new DerivedArgList(Args.getBaseArgs());
2563     const OptTable &Opts = getDriver().getOpts();
2564 
2565     // Request the shared library. Given that these options are decided
2566     // implicitly, they do not refer to any base argument.
2567     DAL->AddFlagArg(/*BaseArg=*/nullptr, Opts.getOption(options::OPT_shared));
2568     DAL->AddFlagArg(/*BaseArg=*/nullptr, Opts.getOption(options::OPT_fPIC));
2569 
2570     // Filter all the arguments we don't care passing to the offloading
2571     // toolchain as they can mess up with the creation of a shared library.
2572     for (auto *A : Args) {
2573       switch ((options::ID)A->getOption().getID()) {
2574       default:
2575         DAL->append(A);
2576         break;
2577       case options::OPT_shared:
2578       case options::OPT_dynamic:
2579       case options::OPT_static:
2580       case options::OPT_fPIC:
2581       case options::OPT_fno_PIC:
2582       case options::OPT_fpic:
2583       case options::OPT_fno_pic:
2584       case options::OPT_fPIE:
2585       case options::OPT_fno_PIE:
2586       case options::OPT_fpie:
2587       case options::OPT_fno_pie:
2588         break;
2589       }
2590     }
2591     return DAL;
2592   }
2593   return nullptr;
2594 }
2595 
2596 void Generic_ELF::anchor() {}
2597 
2598 void Generic_ELF::addClangTargetOptions(const ArgList &DriverArgs,
2599                                         ArgStringList &CC1Args,
2600                                         Action::OffloadKind) const {
2601   const Generic_GCC::GCCVersion &V = GCCInstallation.getVersion();
2602   bool UseInitArrayDefault =
2603       getTriple().getArch() == llvm::Triple::aarch64 ||
2604       getTriple().getArch() == llvm::Triple::aarch64_be ||
2605       (getTriple().getOS() == llvm::Triple::FreeBSD &&
2606        getTriple().getOSMajorVersion() >= 12) ||
2607       (getTriple().getOS() == llvm::Triple::Linux &&
2608        ((!GCCInstallation.isValid() || !V.isOlderThan(4, 7, 0)) ||
2609         getTriple().isAndroid())) ||
2610       getTriple().getOS() == llvm::Triple::NaCl ||
2611       (getTriple().getVendor() == llvm::Triple::MipsTechnologies &&
2612        !getTriple().hasEnvironment()) ||
2613       getTriple().getOS() == llvm::Triple::Solaris ||
2614       getTriple().getArch() == llvm::Triple::riscv32 ||
2615       getTriple().getArch() == llvm::Triple::riscv64;
2616 
2617   if (DriverArgs.hasFlag(options::OPT_fuse_init_array,
2618                          options::OPT_fno_use_init_array, UseInitArrayDefault))
2619     CC1Args.push_back("-fuse-init-array");
2620 }
2621