xref: /freebsd/contrib/llvm-project/clang/lib/Driver/ToolChains/MinGW.cpp (revision b4af4f93c682e445bf159f0d1ec90b636296c946) 
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 "InputInfo.h"
11 #include "CommonArgs.h"
12 #include "clang/Config/config.h"
13 #include "clang/Driver/Compilation.h"
14 #include "clang/Driver/Driver.h"
15 #include "clang/Driver/DriverDiagnostic.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 <system_error>
22 
23 using namespace clang::diag;
24 using namespace clang::driver;
25 using namespace clang;
26 using namespace llvm::opt;
27 
28 /// MinGW Tools
29 void tools::MinGW::Assembler::ConstructJob(Compilation &C, const JobAction &JA,
30                                            const InputInfo &Output,
31                                            const InputInfoList &Inputs,
32                                            const ArgList &Args,
33                                            const char *LinkingOutput) const {
34   claimNoWarnArgs(Args);
35   ArgStringList CmdArgs;
36 
37   if (getToolChain().getArch() == llvm::Triple::x86) {
38     CmdArgs.push_back("--32");
39   } else if (getToolChain().getArch() == llvm::Triple::x86_64) {
40     CmdArgs.push_back("--64");
41   }
42 
43   Args.AddAllArgValues(CmdArgs, options::OPT_Wa_COMMA, options::OPT_Xassembler);
44 
45   CmdArgs.push_back("-o");
46   CmdArgs.push_back(Output.getFilename());
47 
48   for (const auto &II : Inputs)
49     CmdArgs.push_back(II.getFilename());
50 
51   const char *Exec = Args.MakeArgString(getToolChain().GetProgramPath("as"));
52   C.addCommand(std::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));
53 
54   if (Args.hasArg(options::OPT_gsplit_dwarf))
55     SplitDebugInfo(getToolChain(), C, *this, JA, Args, Output,
56                    SplitDebugName(Args, Inputs[0], Output));
57 }
58 
59 void tools::MinGW::Linker::AddLibGCC(const ArgList &Args,
60                                      ArgStringList &CmdArgs) const {
61   if (Args.hasArg(options::OPT_mthreads))
62     CmdArgs.push_back("-lmingwthrd");
63   CmdArgs.push_back("-lmingw32");
64 
65   // Make use of compiler-rt if --rtlib option is used
66   ToolChain::RuntimeLibType RLT = getToolChain().GetRuntimeLibType(Args);
67   if (RLT == ToolChain::RLT_Libgcc) {
68     bool Static = Args.hasArg(options::OPT_static_libgcc) ||
69                   Args.hasArg(options::OPT_static);
70     bool Shared = Args.hasArg(options::OPT_shared);
71     bool CXX = getToolChain().getDriver().CCCIsCXX();
72 
73     if (Static || (!CXX && !Shared)) {
74       CmdArgs.push_back("-lgcc");
75       CmdArgs.push_back("-lgcc_eh");
76     } else {
77       CmdArgs.push_back("-lgcc_s");
78       CmdArgs.push_back("-lgcc");
79     }
80   } else {
81     AddRunTimeLibs(getToolChain(), getToolChain().getDriver(), CmdArgs, Args);
82   }
83 
84   CmdArgs.push_back("-lmoldname");
85   CmdArgs.push_back("-lmingwex");
86   for (auto Lib : Args.getAllArgValues(options::OPT_l))
87     if (StringRef(Lib).startswith("msvcr") || StringRef(Lib).startswith("ucrt"))
88       return;
89   CmdArgs.push_back("-lmsvcrt");
90 }
91 
92 void tools::MinGW::Linker::ConstructJob(Compilation &C, const JobAction &JA,
93                                         const InputInfo &Output,
94                                         const InputInfoList &Inputs,
95                                         const ArgList &Args,
96                                         const char *LinkingOutput) const {
97   const ToolChain &TC = getToolChain();
98   const Driver &D = TC.getDriver();
99   const SanitizerArgs &Sanitize = TC.getSanitizerArgs();
100 
101   ArgStringList CmdArgs;
102 
103   // Silence warning for "clang -g foo.o -o foo"
104   Args.ClaimAllArgs(options::OPT_g_Group);
105   // and "clang -emit-llvm foo.o -o foo"
106   Args.ClaimAllArgs(options::OPT_emit_llvm);
107   // and for "clang -w foo.o -o foo". Other warning options are already
108   // handled somewhere else.
109   Args.ClaimAllArgs(options::OPT_w);
110 
111   if (!D.SysRoot.empty())
112     CmdArgs.push_back(Args.MakeArgString("--sysroot=" + D.SysRoot));
113 
114   if (Args.hasArg(options::OPT_s))
115     CmdArgs.push_back("-s");
116 
117   CmdArgs.push_back("-m");
118   switch (TC.getArch()) {
119   case llvm::Triple::x86:
120     CmdArgs.push_back("i386pe");
121     break;
122   case llvm::Triple::x86_64:
123     CmdArgs.push_back("i386pep");
124     break;
125   case llvm::Triple::arm:
126   case llvm::Triple::thumb:
127     // FIXME: this is incorrect for WinCE
128     CmdArgs.push_back("thumb2pe");
129     break;
130   case llvm::Triple::aarch64:
131     CmdArgs.push_back("arm64pe");
132     break;
133   default:
134     llvm_unreachable("Unsupported target architecture.");
135   }
136 
137   if (Args.hasArg(options::OPT_mwindows)) {
138     CmdArgs.push_back("--subsystem");
139     CmdArgs.push_back("windows");
140   } else if (Args.hasArg(options::OPT_mconsole)) {
141     CmdArgs.push_back("--subsystem");
142     CmdArgs.push_back("console");
143   }
144 
145   if (Args.hasArg(options::OPT_mdll))
146     CmdArgs.push_back("--dll");
147   else if (Args.hasArg(options::OPT_shared))
148     CmdArgs.push_back("--shared");
149   if (Args.hasArg(options::OPT_static))
150     CmdArgs.push_back("-Bstatic");
151   else
152     CmdArgs.push_back("-Bdynamic");
153   if (Args.hasArg(options::OPT_mdll) || Args.hasArg(options::OPT_shared)) {
154     CmdArgs.push_back("-e");
155     if (TC.getArch() == llvm::Triple::x86)
156       CmdArgs.push_back("_DllMainCRTStartup@12");
157     else
158       CmdArgs.push_back("DllMainCRTStartup");
159     CmdArgs.push_back("--enable-auto-image-base");
160   }
161 
162   CmdArgs.push_back("-o");
163   const char *OutputFile = Output.getFilename();
164   // GCC implicitly adds an .exe extension if it is given an output file name
165   // that lacks an extension. However, GCC only does this when actually
166   // running on windows, not when operating as a cross compiler. As some users
167   // have come to rely on this behaviour, try to replicate it.
168 #ifdef _WIN32
169   if (!llvm::sys::path::has_extension(OutputFile))
170     CmdArgs.push_back(Args.MakeArgString(Twine(OutputFile) + ".exe"));
171   else
172     CmdArgs.push_back(OutputFile);
173 #else
174   CmdArgs.push_back(OutputFile);
175 #endif
176 
177   Args.AddAllArgs(CmdArgs, options::OPT_e);
178   // FIXME: add -N, -n flags
179   Args.AddLastArg(CmdArgs, options::OPT_r);
180   Args.AddLastArg(CmdArgs, options::OPT_s);
181   Args.AddLastArg(CmdArgs, options::OPT_t);
182   Args.AddAllArgs(CmdArgs, options::OPT_u_Group);
183   Args.AddLastArg(CmdArgs, options::OPT_Z_Flag);
184 
185   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles)) {
186     if (Args.hasArg(options::OPT_shared) || Args.hasArg(options::OPT_mdll)) {
187       CmdArgs.push_back(Args.MakeArgString(TC.GetFilePath("dllcrt2.o")));
188     } else {
189       if (Args.hasArg(options::OPT_municode))
190         CmdArgs.push_back(Args.MakeArgString(TC.GetFilePath("crt2u.o")));
191       else
192         CmdArgs.push_back(Args.MakeArgString(TC.GetFilePath("crt2.o")));
193     }
194     if (Args.hasArg(options::OPT_pg))
195       CmdArgs.push_back(Args.MakeArgString(TC.GetFilePath("gcrt2.o")));
196     CmdArgs.push_back(Args.MakeArgString(TC.GetFilePath("crtbegin.o")));
197   }
198 
199   Args.AddAllArgs(CmdArgs, options::OPT_L);
200   TC.AddFilePathLibArgs(Args, CmdArgs);
201   AddLinkerInputs(TC, Inputs, Args, CmdArgs, JA);
202 
203   // TODO: Add profile stuff here
204 
205   if (TC.ShouldLinkCXXStdlib(Args)) {
206     bool OnlyLibstdcxxStatic = Args.hasArg(options::OPT_static_libstdcxx) &&
207                                !Args.hasArg(options::OPT_static);
208     if (OnlyLibstdcxxStatic)
209       CmdArgs.push_back("-Bstatic");
210     TC.AddCXXStdlibLibArgs(Args, CmdArgs);
211     if (OnlyLibstdcxxStatic)
212       CmdArgs.push_back("-Bdynamic");
213   }
214 
215   bool HasWindowsApp = false;
216   for (auto Lib : Args.getAllArgValues(options::OPT_l)) {
217     if (Lib == "windowsapp") {
218       HasWindowsApp = true;
219       break;
220     }
221   }
222 
223   if (!Args.hasArg(options::OPT_nostdlib)) {
224     if (!Args.hasArg(options::OPT_nodefaultlibs)) {
225       if (Args.hasArg(options::OPT_static))
226         CmdArgs.push_back("--start-group");
227 
228       if (Args.hasArg(options::OPT_fstack_protector) ||
229           Args.hasArg(options::OPT_fstack_protector_strong) ||
230           Args.hasArg(options::OPT_fstack_protector_all)) {
231         CmdArgs.push_back("-lssp_nonshared");
232         CmdArgs.push_back("-lssp");
233       }
234 
235       if (Args.hasFlag(options::OPT_fopenmp, options::OPT_fopenmp_EQ,
236                        options::OPT_fno_openmp, false)) {
237         switch (TC.getDriver().getOpenMPRuntime(Args)) {
238         case Driver::OMPRT_OMP:
239           CmdArgs.push_back("-lomp");
240           break;
241         case Driver::OMPRT_IOMP5:
242           CmdArgs.push_back("-liomp5md");
243           break;
244         case Driver::OMPRT_GOMP:
245           CmdArgs.push_back("-lgomp");
246           break;
247         case Driver::OMPRT_Unknown:
248           // Already diagnosed.
249           break;
250         }
251       }
252 
253       AddLibGCC(Args, CmdArgs);
254 
255       if (Args.hasArg(options::OPT_pg))
256         CmdArgs.push_back("-lgmon");
257 
258       if (Args.hasArg(options::OPT_pthread))
259         CmdArgs.push_back("-lpthread");
260 
261       if (Sanitize.needsAsanRt()) {
262         // MinGW always links against a shared MSVCRT.
263         CmdArgs.push_back(TC.getCompilerRTArgString(Args, "asan_dynamic",
264                                                     ToolChain::FT_Shared));
265         CmdArgs.push_back(
266             TC.getCompilerRTArgString(Args, "asan_dynamic_runtime_thunk"));
267         CmdArgs.push_back("--require-defined");
268         CmdArgs.push_back(TC.getArch() == llvm::Triple::x86
269                               ? "___asan_seh_interceptor"
270                               : "__asan_seh_interceptor");
271         // Make sure the linker consider all object files from the dynamic
272         // runtime thunk.
273         CmdArgs.push_back("--whole-archive");
274         CmdArgs.push_back(
275             TC.getCompilerRTArgString(Args, "asan_dynamic_runtime_thunk"));
276         CmdArgs.push_back("--no-whole-archive");
277       }
278 
279       TC.addProfileRTLibs(Args, CmdArgs);
280 
281       if (!HasWindowsApp) {
282         // Add system libraries. If linking to libwindowsapp.a, that import
283         // library replaces all these and we shouldn't accidentally try to
284         // link to the normal desktop mode dlls.
285         if (Args.hasArg(options::OPT_mwindows)) {
286           CmdArgs.push_back("-lgdi32");
287           CmdArgs.push_back("-lcomdlg32");
288         }
289         CmdArgs.push_back("-ladvapi32");
290         CmdArgs.push_back("-lshell32");
291         CmdArgs.push_back("-luser32");
292         CmdArgs.push_back("-lkernel32");
293       }
294 
295       if (Args.hasArg(options::OPT_static))
296         CmdArgs.push_back("--end-group");
297       else
298         AddLibGCC(Args, CmdArgs);
299     }
300 
301     if (!Args.hasArg(options::OPT_nostartfiles)) {
302       // Add crtfastmath.o if available and fast math is enabled.
303       TC.AddFastMathRuntimeIfAvailable(Args, CmdArgs);
304 
305       CmdArgs.push_back(Args.MakeArgString(TC.GetFilePath("crtend.o")));
306     }
307   }
308   const char *Exec = Args.MakeArgString(TC.GetLinkerPath());
309   C.addCommand(std::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));
310 }
311 
312 // Simplified from Generic_GCC::GCCInstallationDetector::ScanLibDirForGCCTriple.
313 static bool findGccVersion(StringRef LibDir, std::string &GccLibDir,
314                            std::string &Ver) {
315   auto Version = toolchains::Generic_GCC::GCCVersion::Parse("0.0.0");
316   std::error_code EC;
317   for (llvm::sys::fs::directory_iterator LI(LibDir, EC), LE; !EC && LI != LE;
318        LI = LI.increment(EC)) {
319     StringRef VersionText = llvm::sys::path::filename(LI->path());
320     auto CandidateVersion =
321         toolchains::Generic_GCC::GCCVersion::Parse(VersionText);
322     if (CandidateVersion.Major == -1)
323       continue;
324     if (CandidateVersion <= Version)
325       continue;
326     Ver = VersionText;
327     GccLibDir = LI->path();
328   }
329   return Ver.size();
330 }
331 
332 void toolchains::MinGW::findGccLibDir() {
333   llvm::SmallVector<llvm::SmallString<32>, 2> Archs;
334   Archs.emplace_back(getTriple().getArchName());
335   Archs[0] += "-w64-mingw32";
336   Archs.emplace_back("mingw32");
337   if (Arch.empty())
338     Arch = Archs[0].str();
339   // lib: Arch Linux, Ubuntu, Windows
340   // lib64: openSUSE Linux
341   for (StringRef CandidateLib : {"lib", "lib64"}) {
342     for (StringRef CandidateArch : Archs) {
343       llvm::SmallString<1024> LibDir(Base);
344       llvm::sys::path::append(LibDir, CandidateLib, "gcc", CandidateArch);
345       if (findGccVersion(LibDir, GccLibDir, Ver)) {
346         Arch = CandidateArch;
347         return;
348       }
349     }
350   }
351 }
352 
353 llvm::ErrorOr<std::string> toolchains::MinGW::findGcc() {
354   llvm::SmallVector<llvm::SmallString<32>, 2> Gccs;
355   Gccs.emplace_back(getTriple().getArchName());
356   Gccs[0] += "-w64-mingw32-gcc";
357   Gccs.emplace_back("mingw32-gcc");
358   // Please do not add "gcc" here
359   for (StringRef CandidateGcc : Gccs)
360     if (llvm::ErrorOr<std::string> GPPName = llvm::sys::findProgramByName(CandidateGcc))
361       return GPPName;
362   return make_error_code(std::errc::no_such_file_or_directory);
363 }
364 
365 llvm::ErrorOr<std::string> toolchains::MinGW::findClangRelativeSysroot() {
366   llvm::SmallVector<llvm::SmallString<32>, 2> Subdirs;
367   Subdirs.emplace_back(getTriple().str());
368   Subdirs.emplace_back(getTriple().getArchName());
369   Subdirs[1] += "-w64-mingw32";
370   StringRef ClangRoot =
371       llvm::sys::path::parent_path(getDriver().getInstalledDir());
372   StringRef Sep = llvm::sys::path::get_separator();
373   for (StringRef CandidateSubdir : Subdirs) {
374     if (llvm::sys::fs::is_directory(ClangRoot + Sep + CandidateSubdir)) {
375       Arch = CandidateSubdir;
376       return (ClangRoot + Sep + CandidateSubdir).str();
377     }
378   }
379   return make_error_code(std::errc::no_such_file_or_directory);
380 }
381 
382 toolchains::MinGW::MinGW(const Driver &D, const llvm::Triple &Triple,
383                          const ArgList &Args)
384     : ToolChain(D, Triple, Args), CudaInstallation(D, Triple, Args) {
385   getProgramPaths().push_back(getDriver().getInstalledDir());
386 
387   if (getDriver().SysRoot.size())
388     Base = getDriver().SysRoot;
389   // Look for <clang-bin>/../<triplet>; if found, use <clang-bin>/.. as the
390   // base as it could still be a base for a gcc setup with libgcc.
391   else if (llvm::ErrorOr<std::string> TargetSubdir = findClangRelativeSysroot())
392     Base = llvm::sys::path::parent_path(TargetSubdir.get());
393   else if (llvm::ErrorOr<std::string> GPPName = findGcc())
394     Base = llvm::sys::path::parent_path(
395         llvm::sys::path::parent_path(GPPName.get()));
396   else
397     Base = llvm::sys::path::parent_path(getDriver().getInstalledDir());
398 
399   Base += llvm::sys::path::get_separator();
400   findGccLibDir();
401   // GccLibDir must precede Base/lib so that the
402   // correct crtbegin.o ,cetend.o would be found.
403   getFilePaths().push_back(GccLibDir);
404   getFilePaths().push_back(
405       (Base + Arch + llvm::sys::path::get_separator() + "lib").str());
406   getFilePaths().push_back(Base + "lib");
407   // openSUSE
408   getFilePaths().push_back(Base + Arch + "/sys-root/mingw/lib");
409 
410   NativeLLVMSupport =
411       Args.getLastArgValue(options::OPT_fuse_ld_EQ, CLANG_DEFAULT_LINKER)
412           .equals_lower("lld");
413 }
414 
415 bool toolchains::MinGW::IsIntegratedAssemblerDefault() const { return true; }
416 
417 Tool *toolchains::MinGW::getTool(Action::ActionClass AC) const {
418   switch (AC) {
419   case Action::PreprocessJobClass:
420     if (!Preprocessor)
421       Preprocessor.reset(new tools::gcc::Preprocessor(*this));
422     return Preprocessor.get();
423   case Action::CompileJobClass:
424     if (!Compiler)
425       Compiler.reset(new tools::gcc::Compiler(*this));
426     return Compiler.get();
427   default:
428     return ToolChain::getTool(AC);
429   }
430 }
431 
432 Tool *toolchains::MinGW::buildAssembler() const {
433   return new tools::MinGW::Assembler(*this);
434 }
435 
436 Tool *toolchains::MinGW::buildLinker() const {
437   return new tools::MinGW::Linker(*this);
438 }
439 
440 bool toolchains::MinGW::HasNativeLLVMSupport() const {
441   return NativeLLVMSupport;
442 }
443 
444 bool toolchains::MinGW::IsUnwindTablesDefault(const ArgList &Args) const {
445   Arg *ExceptionArg = Args.getLastArg(options::OPT_fsjlj_exceptions,
446                                       options::OPT_fseh_exceptions,
447                                       options::OPT_fdwarf_exceptions);
448   if (ExceptionArg &&
449       ExceptionArg->getOption().matches(options::OPT_fseh_exceptions))
450     return true;
451   return getArch() == llvm::Triple::x86_64 ||
452          getArch() == llvm::Triple::aarch64;
453 }
454 
455 bool toolchains::MinGW::isPICDefault() const {
456   return getArch() == llvm::Triple::x86_64;
457 }
458 
459 bool toolchains::MinGW::isPIEDefault() const { return false; }
460 
461 bool toolchains::MinGW::isPICDefaultForced() const {
462   return getArch() == llvm::Triple::x86_64;
463 }
464 
465 llvm::ExceptionHandling
466 toolchains::MinGW::GetExceptionModel(const ArgList &Args) const {
467   if (getArch() == llvm::Triple::x86_64 || getArch() == llvm::Triple::aarch64)
468     return llvm::ExceptionHandling::WinEH;
469   return llvm::ExceptionHandling::DwarfCFI;
470 }
471 
472 SanitizerMask toolchains::MinGW::getSupportedSanitizers() const {
473   SanitizerMask Res = ToolChain::getSupportedSanitizers();
474   Res |= SanitizerKind::Address;
475   Res |= SanitizerKind::PointerCompare;
476   Res |= SanitizerKind::PointerSubtract;
477   return Res;
478 }
479 
480 void toolchains::MinGW::AddCudaIncludeArgs(const ArgList &DriverArgs,
481                                            ArgStringList &CC1Args) const {
482   CudaInstallation.AddCudaIncludeArgs(DriverArgs, CC1Args);
483 }
484 
485 void toolchains::MinGW::printVerboseInfo(raw_ostream &OS) const {
486   CudaInstallation.print(OS);
487 }
488 
489 // Include directories for various hosts:
490 
491 // Windows, mingw.org
492 // c:\mingw\lib\gcc\mingw32\4.8.1\include\c++
493 // c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\mingw32
494 // c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\backward
495 // c:\mingw\include
496 // c:\mingw\mingw32\include
497 
498 // Windows, mingw-w64 mingw-builds
499 // c:\mingw32\i686-w64-mingw32\include
500 // c:\mingw32\i686-w64-mingw32\include\c++
501 // c:\mingw32\i686-w64-mingw32\include\c++\i686-w64-mingw32
502 // c:\mingw32\i686-w64-mingw32\include\c++\backward
503 
504 // Windows, mingw-w64 msys2
505 // c:\msys64\mingw32\include
506 // c:\msys64\mingw32\i686-w64-mingw32\include
507 // c:\msys64\mingw32\include\c++\4.9.2
508 // c:\msys64\mingw32\include\c++\4.9.2\i686-w64-mingw32
509 // c:\msys64\mingw32\include\c++\4.9.2\backward
510 
511 // openSUSE
512 // /usr/lib64/gcc/x86_64-w64-mingw32/5.1.0/include/c++
513 // /usr/lib64/gcc/x86_64-w64-mingw32/5.1.0/include/c++/x86_64-w64-mingw32
514 // /usr/lib64/gcc/x86_64-w64-mingw32/5.1.0/include/c++/backward
515 // /usr/x86_64-w64-mingw32/sys-root/mingw/include
516 
517 // Arch Linux
518 // /usr/i686-w64-mingw32/include/c++/5.1.0
519 // /usr/i686-w64-mingw32/include/c++/5.1.0/i686-w64-mingw32
520 // /usr/i686-w64-mingw32/include/c++/5.1.0/backward
521 // /usr/i686-w64-mingw32/include
522 
523 // Ubuntu
524 // /usr/include/c++/4.8
525 // /usr/include/c++/4.8/x86_64-w64-mingw32
526 // /usr/include/c++/4.8/backward
527 // /usr/x86_64-w64-mingw32/include
528 
529 void toolchains::MinGW::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
530                                                   ArgStringList &CC1Args) const {
531   if (DriverArgs.hasArg(options::OPT_nostdinc))
532     return;
533 
534   if (!DriverArgs.hasArg(options::OPT_nobuiltininc)) {
535     SmallString<1024> P(getDriver().ResourceDir);
536     llvm::sys::path::append(P, "include");
537     addSystemInclude(DriverArgs, CC1Args, P.str());
538   }
539 
540   if (DriverArgs.hasArg(options::OPT_nostdlibinc))
541     return;
542 
543   if (GetRuntimeLibType(DriverArgs) == ToolChain::RLT_Libgcc) {
544     // openSUSE
545     addSystemInclude(DriverArgs, CC1Args,
546                      Base + Arch + "/sys-root/mingw/include");
547   }
548 
549   addSystemInclude(DriverArgs, CC1Args,
550                    Base + Arch + llvm::sys::path::get_separator() + "include");
551   addSystemInclude(DriverArgs, CC1Args, Base + "include");
552 }
553 
554 void toolchains::MinGW::AddClangCXXStdlibIncludeArgs(
555     const ArgList &DriverArgs, ArgStringList &CC1Args) const {
556   if (DriverArgs.hasArg(options::OPT_nostdlibinc) ||
557       DriverArgs.hasArg(options::OPT_nostdincxx))
558     return;
559 
560   StringRef Slash = llvm::sys::path::get_separator();
561 
562   switch (GetCXXStdlibType(DriverArgs)) {
563   case ToolChain::CST_Libcxx:
564     addSystemInclude(DriverArgs, CC1Args, Base + Arch + Slash + "include" +
565                                               Slash + "c++" + Slash + "v1");
566     addSystemInclude(DriverArgs, CC1Args,
567                      Base + "include" + Slash + "c++" + Slash + "v1");
568     break;
569 
570   case ToolChain::CST_Libstdcxx:
571     llvm::SmallVector<llvm::SmallString<1024>, 4> CppIncludeBases;
572     CppIncludeBases.emplace_back(Base);
573     llvm::sys::path::append(CppIncludeBases[0], Arch, "include", "c++");
574     CppIncludeBases.emplace_back(Base);
575     llvm::sys::path::append(CppIncludeBases[1], Arch, "include", "c++", Ver);
576     CppIncludeBases.emplace_back(Base);
577     llvm::sys::path::append(CppIncludeBases[2], "include", "c++", Ver);
578     CppIncludeBases.emplace_back(GccLibDir);
579     llvm::sys::path::append(CppIncludeBases[3], "include", "c++");
580     for (auto &CppIncludeBase : CppIncludeBases) {
581       addSystemInclude(DriverArgs, CC1Args, CppIncludeBase);
582       CppIncludeBase += Slash;
583       addSystemInclude(DriverArgs, CC1Args, CppIncludeBase + Arch);
584       addSystemInclude(DriverArgs, CC1Args, CppIncludeBase + "backward");
585     }
586     break;
587   }
588 }
589