xref: /freebsd/contrib/llvm-project/clang/lib/Driver/ToolChains/MinGW.cpp (revision 5e801ac66d24704442eba426ed13c3effb8a34e7) 
1 //===--- MinGW.cpp - MinGWToolChain Implementation ------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #include "MinGW.h"
10 #include "CommonArgs.h"
11 #include "clang/Config/config.h"
12 #include "clang/Driver/Compilation.h"
13 #include "clang/Driver/Driver.h"
14 #include "clang/Driver/DriverDiagnostic.h"
15 #include "clang/Driver/InputInfo.h"
16 #include "clang/Driver/Options.h"
17 #include "clang/Driver/SanitizerArgs.h"
18 #include "llvm/Option/ArgList.h"
19 #include "llvm/Support/FileSystem.h"
20 #include "llvm/Support/Path.h"
21 #include "llvm/Support/VirtualFileSystem.h"
22 #include <system_error>
23 
24 using namespace clang::diag;
25 using namespace clang::driver;
26 using namespace clang;
27 using namespace llvm::opt;
28 
29 /// MinGW Tools
30 void tools::MinGW::Assembler::ConstructJob(Compilation &C, const JobAction &JA,
31                                            const InputInfo &Output,
32                                            const InputInfoList &Inputs,
33                                            const ArgList &Args,
34                                            const char *LinkingOutput) const {
35   claimNoWarnArgs(Args);
36   ArgStringList CmdArgs;
37 
38   if (getToolChain().getArch() == llvm::Triple::x86) {
39     CmdArgs.push_back("--32");
40   } else if (getToolChain().getArch() == llvm::Triple::x86_64) {
41     CmdArgs.push_back("--64");
42   }
43 
44   Args.AddAllArgValues(CmdArgs, options::OPT_Wa_COMMA, options::OPT_Xassembler);
45 
46   CmdArgs.push_back("-o");
47   CmdArgs.push_back(Output.getFilename());
48 
49   for (const auto &II : Inputs)
50     CmdArgs.push_back(II.getFilename());
51 
52   const char *Exec = Args.MakeArgString(getToolChain().GetProgramPath("as"));
53   C.addCommand(std::make_unique<Command>(JA, *this, ResponseFileSupport::None(),
54                                          Exec, CmdArgs, Inputs, Output));
55 
56   if (Args.hasArg(options::OPT_gsplit_dwarf))
57     SplitDebugInfo(getToolChain(), C, *this, JA, Args, Output,
58                    SplitDebugName(JA, Args, Inputs[0], Output));
59 }
60 
61 void tools::MinGW::Linker::AddLibGCC(const ArgList &Args,
62                                      ArgStringList &CmdArgs) const {
63   if (Args.hasArg(options::OPT_mthreads))
64     CmdArgs.push_back("-lmingwthrd");
65   CmdArgs.push_back("-lmingw32");
66 
67   // Make use of compiler-rt if --rtlib option is used
68   ToolChain::RuntimeLibType RLT = getToolChain().GetRuntimeLibType(Args);
69   if (RLT == ToolChain::RLT_Libgcc) {
70     bool Static = Args.hasArg(options::OPT_static_libgcc) ||
71                   Args.hasArg(options::OPT_static);
72     bool Shared = Args.hasArg(options::OPT_shared);
73     bool CXX = getToolChain().getDriver().CCCIsCXX();
74 
75     if (Static || (!CXX && !Shared)) {
76       CmdArgs.push_back("-lgcc");
77       CmdArgs.push_back("-lgcc_eh");
78     } else {
79       CmdArgs.push_back("-lgcc_s");
80       CmdArgs.push_back("-lgcc");
81     }
82   } else {
83     AddRunTimeLibs(getToolChain(), getToolChain().getDriver(), CmdArgs, Args);
84   }
85 
86   CmdArgs.push_back("-lmoldname");
87   CmdArgs.push_back("-lmingwex");
88   for (auto Lib : Args.getAllArgValues(options::OPT_l))
89     if (StringRef(Lib).startswith("msvcr") || StringRef(Lib).startswith("ucrt"))
90       return;
91   CmdArgs.push_back("-lmsvcrt");
92 }
93 
94 void tools::MinGW::Linker::ConstructJob(Compilation &C, const JobAction &JA,
95                                         const InputInfo &Output,
96                                         const InputInfoList &Inputs,
97                                         const ArgList &Args,
98                                         const char *LinkingOutput) const {
99   const ToolChain &TC = getToolChain();
100   const Driver &D = TC.getDriver();
101   const SanitizerArgs &Sanitize = TC.getSanitizerArgs(Args);
102 
103   ArgStringList CmdArgs;
104 
105   // Silence warning for "clang -g foo.o -o foo"
106   Args.ClaimAllArgs(options::OPT_g_Group);
107   // and "clang -emit-llvm foo.o -o foo"
108   Args.ClaimAllArgs(options::OPT_emit_llvm);
109   // and for "clang -w foo.o -o foo". Other warning options are already
110   // handled somewhere else.
111   Args.ClaimAllArgs(options::OPT_w);
112 
113   if (!D.SysRoot.empty())
114     CmdArgs.push_back(Args.MakeArgString("--sysroot=" + D.SysRoot));
115 
116   if (Args.hasArg(options::OPT_s))
117     CmdArgs.push_back("-s");
118 
119   CmdArgs.push_back("-m");
120   switch (TC.getArch()) {
121   case llvm::Triple::x86:
122     CmdArgs.push_back("i386pe");
123     break;
124   case llvm::Triple::x86_64:
125     CmdArgs.push_back("i386pep");
126     break;
127   case llvm::Triple::arm:
128   case llvm::Triple::thumb:
129     // FIXME: this is incorrect for WinCE
130     CmdArgs.push_back("thumb2pe");
131     break;
132   case llvm::Triple::aarch64:
133     CmdArgs.push_back("arm64pe");
134     break;
135   default:
136     llvm_unreachable("Unsupported target architecture.");
137   }
138 
139   Arg *SubsysArg =
140       Args.getLastArg(options::OPT_mwindows, options::OPT_mconsole);
141   if (SubsysArg && SubsysArg->getOption().matches(options::OPT_mwindows)) {
142     CmdArgs.push_back("--subsystem");
143     CmdArgs.push_back("windows");
144   } else if (SubsysArg &&
145              SubsysArg->getOption().matches(options::OPT_mconsole)) {
146     CmdArgs.push_back("--subsystem");
147     CmdArgs.push_back("console");
148   }
149 
150   if (Args.hasArg(options::OPT_mdll))
151     CmdArgs.push_back("--dll");
152   else if (Args.hasArg(options::OPT_shared))
153     CmdArgs.push_back("--shared");
154   if (Args.hasArg(options::OPT_static))
155     CmdArgs.push_back("-Bstatic");
156   else
157     CmdArgs.push_back("-Bdynamic");
158   if (Args.hasArg(options::OPT_mdll) || Args.hasArg(options::OPT_shared)) {
159     CmdArgs.push_back("-e");
160     if (TC.getArch() == llvm::Triple::x86)
161       CmdArgs.push_back("_DllMainCRTStartup@12");
162     else
163       CmdArgs.push_back("DllMainCRTStartup");
164     CmdArgs.push_back("--enable-auto-image-base");
165   }
166 
167   CmdArgs.push_back("-o");
168   const char *OutputFile = Output.getFilename();
169   // GCC implicitly adds an .exe extension if it is given an output file name
170   // that lacks an extension.
171   // GCC used to do this only when the compiler itself runs on windows, but
172   // since GCC 8 it does the same when cross compiling as well.
173   if (!llvm::sys::path::has_extension(OutputFile)) {
174     CmdArgs.push_back(Args.MakeArgString(Twine(OutputFile) + ".exe"));
175     OutputFile = CmdArgs.back();
176   } else
177     CmdArgs.push_back(OutputFile);
178 
179   Args.AddAllArgs(CmdArgs, options::OPT_e);
180   // FIXME: add -N, -n flags
181   Args.AddLastArg(CmdArgs, options::OPT_r);
182   Args.AddLastArg(CmdArgs, options::OPT_s);
183   Args.AddLastArg(CmdArgs, options::OPT_t);
184   Args.AddAllArgs(CmdArgs, options::OPT_u_Group);
185   Args.AddLastArg(CmdArgs, options::OPT_Z_Flag);
186 
187   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles)) {
188     if (Args.hasArg(options::OPT_shared) || Args.hasArg(options::OPT_mdll)) {
189       CmdArgs.push_back(Args.MakeArgString(TC.GetFilePath("dllcrt2.o")));
190     } else {
191       if (Args.hasArg(options::OPT_municode))
192         CmdArgs.push_back(Args.MakeArgString(TC.GetFilePath("crt2u.o")));
193       else
194         CmdArgs.push_back(Args.MakeArgString(TC.GetFilePath("crt2.o")));
195     }
196     if (Args.hasArg(options::OPT_pg))
197       CmdArgs.push_back(Args.MakeArgString(TC.GetFilePath("gcrt2.o")));
198     CmdArgs.push_back(Args.MakeArgString(TC.GetFilePath("crtbegin.o")));
199   }
200 
201   Args.AddAllArgs(CmdArgs, options::OPT_L);
202   TC.AddFilePathLibArgs(Args, CmdArgs);
203 
204   // Add the compiler-rt library directories if they exist to help
205   // the linker find the various sanitizer, builtin, and profiling runtimes.
206   for (const auto &LibPath : TC.getLibraryPaths()) {
207     if (TC.getVFS().exists(LibPath))
208       CmdArgs.push_back(Args.MakeArgString("-L" + LibPath));
209   }
210   auto CRTPath = TC.getCompilerRTPath();
211   if (TC.getVFS().exists(CRTPath))
212     CmdArgs.push_back(Args.MakeArgString("-L" + CRTPath));
213 
214   AddLinkerInputs(TC, Inputs, Args, CmdArgs, JA);
215 
216   // TODO: Add profile stuff here
217 
218   if (TC.ShouldLinkCXXStdlib(Args)) {
219     bool OnlyLibstdcxxStatic = Args.hasArg(options::OPT_static_libstdcxx) &&
220                                !Args.hasArg(options::OPT_static);
221     if (OnlyLibstdcxxStatic)
222       CmdArgs.push_back("-Bstatic");
223     TC.AddCXXStdlibLibArgs(Args, CmdArgs);
224     if (OnlyLibstdcxxStatic)
225       CmdArgs.push_back("-Bdynamic");
226   }
227 
228   bool HasWindowsApp = false;
229   for (auto Lib : Args.getAllArgValues(options::OPT_l)) {
230     if (Lib == "windowsapp") {
231       HasWindowsApp = true;
232       break;
233     }
234   }
235 
236   if (!Args.hasArg(options::OPT_nostdlib)) {
237     if (!Args.hasArg(options::OPT_nodefaultlibs)) {
238       if (Args.hasArg(options::OPT_static))
239         CmdArgs.push_back("--start-group");
240 
241       if (Args.hasArg(options::OPT_fstack_protector) ||
242           Args.hasArg(options::OPT_fstack_protector_strong) ||
243           Args.hasArg(options::OPT_fstack_protector_all)) {
244         CmdArgs.push_back("-lssp_nonshared");
245         CmdArgs.push_back("-lssp");
246       }
247 
248       if (Args.hasFlag(options::OPT_fopenmp, options::OPT_fopenmp_EQ,
249                        options::OPT_fno_openmp, false)) {
250         switch (TC.getDriver().getOpenMPRuntime(Args)) {
251         case Driver::OMPRT_OMP:
252           CmdArgs.push_back("-lomp");
253           break;
254         case Driver::OMPRT_IOMP5:
255           CmdArgs.push_back("-liomp5md");
256           break;
257         case Driver::OMPRT_GOMP:
258           CmdArgs.push_back("-lgomp");
259           break;
260         case Driver::OMPRT_Unknown:
261           // Already diagnosed.
262           break;
263         }
264       }
265 
266       AddLibGCC(Args, CmdArgs);
267 
268       if (Args.hasArg(options::OPT_pg))
269         CmdArgs.push_back("-lgmon");
270 
271       if (Args.hasArg(options::OPT_pthread))
272         CmdArgs.push_back("-lpthread");
273 
274       if (Sanitize.needsAsanRt()) {
275         // MinGW always links against a shared MSVCRT.
276         CmdArgs.push_back(TC.getCompilerRTArgString(Args, "asan_dynamic",
277                                                     ToolChain::FT_Shared));
278         CmdArgs.push_back(
279             TC.getCompilerRTArgString(Args, "asan_dynamic_runtime_thunk"));
280         CmdArgs.push_back("--require-defined");
281         CmdArgs.push_back(TC.getArch() == llvm::Triple::x86
282                               ? "___asan_seh_interceptor"
283                               : "__asan_seh_interceptor");
284         // Make sure the linker consider all object files from the dynamic
285         // runtime thunk.
286         CmdArgs.push_back("--whole-archive");
287         CmdArgs.push_back(
288             TC.getCompilerRTArgString(Args, "asan_dynamic_runtime_thunk"));
289         CmdArgs.push_back("--no-whole-archive");
290       }
291 
292       TC.addProfileRTLibs(Args, CmdArgs);
293 
294       if (!HasWindowsApp) {
295         // Add system libraries. If linking to libwindowsapp.a, that import
296         // library replaces all these and we shouldn't accidentally try to
297         // link to the normal desktop mode dlls.
298         if (Args.hasArg(options::OPT_mwindows)) {
299           CmdArgs.push_back("-lgdi32");
300           CmdArgs.push_back("-lcomdlg32");
301         }
302         CmdArgs.push_back("-ladvapi32");
303         CmdArgs.push_back("-lshell32");
304         CmdArgs.push_back("-luser32");
305         CmdArgs.push_back("-lkernel32");
306       }
307 
308       if (Args.hasArg(options::OPT_static)) {
309         CmdArgs.push_back("--end-group");
310       } else {
311         AddLibGCC(Args, CmdArgs);
312         if (!HasWindowsApp)
313           CmdArgs.push_back("-lkernel32");
314       }
315     }
316 
317     if (!Args.hasArg(options::OPT_nostartfiles)) {
318       // Add crtfastmath.o if available and fast math is enabled.
319       TC.addFastMathRuntimeIfAvailable(Args, CmdArgs);
320 
321       CmdArgs.push_back(Args.MakeArgString(TC.GetFilePath("crtend.o")));
322     }
323   }
324   const char *Exec = Args.MakeArgString(TC.GetLinkerPath());
325   C.addCommand(std::make_unique<Command>(JA, *this,
326                                          ResponseFileSupport::AtFileUTF8(),
327                                          Exec, CmdArgs, Inputs, Output));
328 }
329 
330 // Simplified from Generic_GCC::GCCInstallationDetector::ScanLibDirForGCCTriple.
331 static bool findGccVersion(StringRef LibDir, std::string &GccLibDir,
332                            std::string &Ver) {
333   auto Version = toolchains::Generic_GCC::GCCVersion::Parse("0.0.0");
334   std::error_code EC;
335   for (llvm::sys::fs::directory_iterator LI(LibDir, EC), LE; !EC && LI != LE;
336        LI = LI.increment(EC)) {
337     StringRef VersionText = llvm::sys::path::filename(LI->path());
338     auto CandidateVersion =
339         toolchains::Generic_GCC::GCCVersion::Parse(VersionText);
340     if (CandidateVersion.Major == -1)
341       continue;
342     if (CandidateVersion <= Version)
343       continue;
344     Version = CandidateVersion;
345     Ver = std::string(VersionText);
346     GccLibDir = LI->path();
347   }
348   return Ver.size();
349 }
350 
351 void toolchains::MinGW::findGccLibDir() {
352   llvm::SmallVector<llvm::SmallString<32>, 2> SubdirNames;
353   SubdirNames.emplace_back(getTriple().getArchName());
354   SubdirNames[0] += "-w64-mingw32";
355   SubdirNames.emplace_back("mingw32");
356   if (SubdirName.empty())
357     SubdirName = std::string(SubdirNames[0].str());
358   // lib: Arch Linux, Ubuntu, Windows
359   // lib64: openSUSE Linux
360   for (StringRef CandidateLib : {"lib", "lib64"}) {
361     for (StringRef CandidateSysroot : SubdirNames) {
362       llvm::SmallString<1024> LibDir(Base);
363       llvm::sys::path::append(LibDir, CandidateLib, "gcc", CandidateSysroot);
364       if (findGccVersion(LibDir, GccLibDir, Ver)) {
365         SubdirName = std::string(CandidateSysroot);
366         return;
367       }
368     }
369   }
370 }
371 
372 static llvm::ErrorOr<std::string> findGcc(const llvm::Triple &T) {
373   llvm::SmallVector<llvm::SmallString<32>, 2> Gccs;
374   Gccs.emplace_back(T.getArchName());
375   Gccs[0] += "-w64-mingw32-gcc";
376   Gccs.emplace_back("mingw32-gcc");
377   // Please do not add "gcc" here
378   for (StringRef CandidateGcc : Gccs)
379     if (llvm::ErrorOr<std::string> GPPName = llvm::sys::findProgramByName(CandidateGcc))
380       return GPPName;
381   return make_error_code(std::errc::no_such_file_or_directory);
382 }
383 
384 static llvm::ErrorOr<std::string>
385 findClangRelativeSysroot(const Driver &D, const llvm::Triple &T,
386                          std::string &SubdirName) {
387   llvm::SmallVector<llvm::SmallString<32>, 2> Subdirs;
388   Subdirs.emplace_back(T.str());
389   Subdirs.emplace_back(T.getArchName());
390   Subdirs[1] += "-w64-mingw32";
391   StringRef ClangRoot = llvm::sys::path::parent_path(D.getInstalledDir());
392   StringRef Sep = llvm::sys::path::get_separator();
393   for (StringRef CandidateSubdir : Subdirs) {
394     if (llvm::sys::fs::is_directory(ClangRoot + Sep + CandidateSubdir)) {
395       SubdirName = std::string(CandidateSubdir);
396       return (ClangRoot + Sep + CandidateSubdir).str();
397     }
398   }
399   return make_error_code(std::errc::no_such_file_or_directory);
400 }
401 
402 toolchains::MinGW::MinGW(const Driver &D, const llvm::Triple &Triple,
403                          const ArgList &Args)
404     : ToolChain(D, Triple, Args), CudaInstallation(D, Triple, Args),
405       RocmInstallation(D, Triple, Args) {
406   getProgramPaths().push_back(getDriver().getInstalledDir());
407 
408   // The sequence for detecting a sysroot here should be kept in sync with
409   // the testTriple function below.
410   if (getDriver().SysRoot.size())
411     Base = getDriver().SysRoot;
412   // Look for <clang-bin>/../<triplet>; if found, use <clang-bin>/.. as the
413   // base as it could still be a base for a gcc setup with libgcc.
414   else if (llvm::ErrorOr<std::string> TargetSubdir =
415                findClangRelativeSysroot(getDriver(), getTriple(), SubdirName))
416     Base = std::string(llvm::sys::path::parent_path(TargetSubdir.get()));
417   else if (llvm::ErrorOr<std::string> GPPName = findGcc(getTriple()))
418     Base = std::string(llvm::sys::path::parent_path(
419         llvm::sys::path::parent_path(GPPName.get())));
420   else
421     Base = std::string(
422         llvm::sys::path::parent_path(getDriver().getInstalledDir()));
423 
424   Base += llvm::sys::path::get_separator();
425   findGccLibDir();
426   // GccLibDir must precede Base/lib so that the
427   // correct crtbegin.o ,cetend.o would be found.
428   getFilePaths().push_back(GccLibDir);
429   getFilePaths().push_back(
430       (Base + SubdirName + llvm::sys::path::get_separator() + "lib").str());
431   getFilePaths().push_back(Base + "lib");
432   // openSUSE
433   getFilePaths().push_back(Base + SubdirName + "/sys-root/mingw/lib");
434 
435   NativeLLVMSupport =
436       Args.getLastArgValue(options::OPT_fuse_ld_EQ, CLANG_DEFAULT_LINKER)
437           .equals_insensitive("lld");
438 }
439 
440 bool toolchains::MinGW::IsIntegratedAssemblerDefault() const { return true; }
441 
442 Tool *toolchains::MinGW::getTool(Action::ActionClass AC) const {
443   switch (AC) {
444   case Action::PreprocessJobClass:
445     if (!Preprocessor)
446       Preprocessor.reset(new tools::gcc::Preprocessor(*this));
447     return Preprocessor.get();
448   case Action::CompileJobClass:
449     if (!Compiler)
450       Compiler.reset(new tools::gcc::Compiler(*this));
451     return Compiler.get();
452   default:
453     return ToolChain::getTool(AC);
454   }
455 }
456 
457 Tool *toolchains::MinGW::buildAssembler() const {
458   return new tools::MinGW::Assembler(*this);
459 }
460 
461 Tool *toolchains::MinGW::buildLinker() const {
462   return new tools::MinGW::Linker(*this);
463 }
464 
465 bool toolchains::MinGW::HasNativeLLVMSupport() const {
466   return NativeLLVMSupport;
467 }
468 
469 bool toolchains::MinGW::IsUnwindTablesDefault(const ArgList &Args) const {
470   Arg *ExceptionArg = Args.getLastArg(options::OPT_fsjlj_exceptions,
471                                       options::OPT_fseh_exceptions,
472                                       options::OPT_fdwarf_exceptions);
473   if (ExceptionArg &&
474       ExceptionArg->getOption().matches(options::OPT_fseh_exceptions))
475     return true;
476   return getArch() == llvm::Triple::x86_64 ||
477          getArch() == llvm::Triple::aarch64;
478 }
479 
480 bool toolchains::MinGW::isPICDefault() const {
481   return getArch() == llvm::Triple::x86_64 ||
482          getArch() == llvm::Triple::aarch64;
483 }
484 
485 bool toolchains::MinGW::isPIEDefault(const llvm::opt::ArgList &Args) const {
486   return false;
487 }
488 
489 bool toolchains::MinGW::isPICDefaultForced() const {
490   return getArch() == llvm::Triple::x86_64 ||
491          getArch() == llvm::Triple::aarch64;
492 }
493 
494 llvm::ExceptionHandling
495 toolchains::MinGW::GetExceptionModel(const ArgList &Args) const {
496   if (getArch() == llvm::Triple::x86_64 || getArch() == llvm::Triple::aarch64)
497     return llvm::ExceptionHandling::WinEH;
498   return llvm::ExceptionHandling::DwarfCFI;
499 }
500 
501 SanitizerMask toolchains::MinGW::getSupportedSanitizers() const {
502   SanitizerMask Res = ToolChain::getSupportedSanitizers();
503   Res |= SanitizerKind::Address;
504   Res |= SanitizerKind::PointerCompare;
505   Res |= SanitizerKind::PointerSubtract;
506   Res |= SanitizerKind::Vptr;
507   return Res;
508 }
509 
510 void toolchains::MinGW::AddCudaIncludeArgs(const ArgList &DriverArgs,
511                                            ArgStringList &CC1Args) const {
512   CudaInstallation.AddCudaIncludeArgs(DriverArgs, CC1Args);
513 }
514 
515 void toolchains::MinGW::AddHIPIncludeArgs(const ArgList &DriverArgs,
516                                           ArgStringList &CC1Args) const {
517   RocmInstallation.AddHIPIncludeArgs(DriverArgs, CC1Args);
518 }
519 
520 void toolchains::MinGW::printVerboseInfo(raw_ostream &OS) const {
521   CudaInstallation.print(OS);
522   RocmInstallation.print(OS);
523 }
524 
525 // Include directories for various hosts:
526 
527 // Windows, mingw.org
528 // c:\mingw\lib\gcc\mingw32\4.8.1\include\c++
529 // c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\mingw32
530 // c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\backward
531 // c:\mingw\include
532 // c:\mingw\mingw32\include
533 
534 // Windows, mingw-w64 mingw-builds
535 // c:\mingw32\i686-w64-mingw32\include
536 // c:\mingw32\i686-w64-mingw32\include\c++
537 // c:\mingw32\i686-w64-mingw32\include\c++\i686-w64-mingw32
538 // c:\mingw32\i686-w64-mingw32\include\c++\backward
539 
540 // Windows, mingw-w64 msys2
541 // c:\msys64\mingw32\include
542 // c:\msys64\mingw32\i686-w64-mingw32\include
543 // c:\msys64\mingw32\include\c++\4.9.2
544 // c:\msys64\mingw32\include\c++\4.9.2\i686-w64-mingw32
545 // c:\msys64\mingw32\include\c++\4.9.2\backward
546 
547 // openSUSE
548 // /usr/lib64/gcc/x86_64-w64-mingw32/5.1.0/include/c++
549 // /usr/lib64/gcc/x86_64-w64-mingw32/5.1.0/include/c++/x86_64-w64-mingw32
550 // /usr/lib64/gcc/x86_64-w64-mingw32/5.1.0/include/c++/backward
551 // /usr/x86_64-w64-mingw32/sys-root/mingw/include
552 
553 // Arch Linux
554 // /usr/i686-w64-mingw32/include/c++/5.1.0
555 // /usr/i686-w64-mingw32/include/c++/5.1.0/i686-w64-mingw32
556 // /usr/i686-w64-mingw32/include/c++/5.1.0/backward
557 // /usr/i686-w64-mingw32/include
558 
559 // Ubuntu
560 // /usr/include/c++/4.8
561 // /usr/include/c++/4.8/x86_64-w64-mingw32
562 // /usr/include/c++/4.8/backward
563 // /usr/x86_64-w64-mingw32/include
564 
565 void toolchains::MinGW::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
566                                                   ArgStringList &CC1Args) const {
567   if (DriverArgs.hasArg(options::OPT_nostdinc))
568     return;
569 
570   if (!DriverArgs.hasArg(options::OPT_nobuiltininc)) {
571     SmallString<1024> P(getDriver().ResourceDir);
572     llvm::sys::path::append(P, "include");
573     addSystemInclude(DriverArgs, CC1Args, P.str());
574   }
575 
576   if (DriverArgs.hasArg(options::OPT_nostdlibinc))
577     return;
578 
579   if (GetRuntimeLibType(DriverArgs) == ToolChain::RLT_Libgcc) {
580     // openSUSE
581     addSystemInclude(DriverArgs, CC1Args,
582                      Base + SubdirName + "/sys-root/mingw/include");
583   }
584 
585   addSystemInclude(DriverArgs, CC1Args,
586                    Base + SubdirName + llvm::sys::path::get_separator() +
587                        "include");
588   addSystemInclude(DriverArgs, CC1Args, Base + "include");
589 }
590 
591 void toolchains::MinGW::AddClangCXXStdlibIncludeArgs(
592     const ArgList &DriverArgs, ArgStringList &CC1Args) const {
593   if (DriverArgs.hasArg(options::OPT_nostdlibinc) ||
594       DriverArgs.hasArg(options::OPT_nostdincxx))
595     return;
596 
597   StringRef Slash = llvm::sys::path::get_separator();
598 
599   switch (GetCXXStdlibType(DriverArgs)) {
600   case ToolChain::CST_Libcxx: {
601     std::string TargetDir = (Base + "include" + Slash + getTripleString() +
602                              Slash + "c++" + Slash + "v1")
603                                 .str();
604     if (getDriver().getVFS().exists(TargetDir))
605       addSystemInclude(DriverArgs, CC1Args, TargetDir);
606     addSystemInclude(DriverArgs, CC1Args,
607                      Base + SubdirName + Slash + "include" + Slash + "c++" +
608                          Slash + "v1");
609     addSystemInclude(DriverArgs, CC1Args,
610                      Base + "include" + Slash + "c++" + Slash + "v1");
611     break;
612   }
613 
614   case ToolChain::CST_Libstdcxx:
615     llvm::SmallVector<llvm::SmallString<1024>, 4> CppIncludeBases;
616     CppIncludeBases.emplace_back(Base);
617     llvm::sys::path::append(CppIncludeBases[0], SubdirName, "include", "c++");
618     CppIncludeBases.emplace_back(Base);
619     llvm::sys::path::append(CppIncludeBases[1], SubdirName, "include", "c++",
620                             Ver);
621     CppIncludeBases.emplace_back(Base);
622     llvm::sys::path::append(CppIncludeBases[2], "include", "c++", Ver);
623     CppIncludeBases.emplace_back(GccLibDir);
624     llvm::sys::path::append(CppIncludeBases[3], "include", "c++");
625     for (auto &CppIncludeBase : CppIncludeBases) {
626       addSystemInclude(DriverArgs, CC1Args, CppIncludeBase);
627       CppIncludeBase += Slash;
628       addSystemInclude(DriverArgs, CC1Args, CppIncludeBase + SubdirName);
629       addSystemInclude(DriverArgs, CC1Args, CppIncludeBase + "backward");
630     }
631     break;
632   }
633 }
634 
635 static bool testTriple(const Driver &D, const llvm::Triple &Triple,
636                        const ArgList &Args) {
637   // If an explicit sysroot is set, that will be used and we shouldn't try to
638   // detect anything else.
639   std::string SubdirName;
640   if (D.SysRoot.size())
641     return true;
642   if (llvm::ErrorOr<std::string> TargetSubdir =
643           findClangRelativeSysroot(D, Triple, SubdirName))
644     return true;
645   if (llvm::ErrorOr<std::string> GPPName = findGcc(Triple))
646     return true;
647   // If we neither found a colocated sysroot or a matching gcc executable,
648   // conclude that we can't know if this is the correct spelling of the triple.
649   return false;
650 }
651 
652 static llvm::Triple adjustTriple(const Driver &D, const llvm::Triple &Triple,
653                                  const ArgList &Args) {
654   // First test if the original triple can find a sysroot with the triple
655   // name.
656   if (testTriple(D, Triple, Args))
657     return Triple;
658   llvm::SmallVector<llvm::StringRef, 3> Archs;
659   // If not, test a couple other possible arch names that might be what was
660   // intended.
661   if (Triple.getArch() == llvm::Triple::x86) {
662     Archs.emplace_back("i386");
663     Archs.emplace_back("i586");
664     Archs.emplace_back("i686");
665   } else if (Triple.getArch() == llvm::Triple::arm ||
666              Triple.getArch() == llvm::Triple::thumb) {
667     Archs.emplace_back("armv7");
668   }
669   for (auto A : Archs) {
670     llvm::Triple TestTriple(Triple);
671     TestTriple.setArchName(A);
672     if (testTriple(D, TestTriple, Args))
673       return TestTriple;
674   }
675   // If none was found, just proceed with the original value.
676   return Triple;
677 }
678 
679 void toolchains::MinGW::fixTripleArch(const Driver &D, llvm::Triple &Triple,
680                                       const ArgList &Args) {
681   if (Triple.getArch() == llvm::Triple::x86 ||
682       Triple.getArch() == llvm::Triple::arm ||
683       Triple.getArch() == llvm::Triple::thumb)
684     Triple = adjustTriple(D, Triple, Args);
685 }
686