xref: /freebsd/contrib/llvm-project/clang/lib/Driver/ToolChains/MinGW.cpp (revision 5956d97f4b3204318ceb6aa9c77bd0bc6ea87a41) 
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") ||
90         StringRef(Lib).startswith("ucrt") ||
91         StringRef(Lib).startswith("crtdll"))
92       return;
93   CmdArgs.push_back("-lmsvcrt");
94 }
95 
96 void tools::MinGW::Linker::ConstructJob(Compilation &C, const JobAction &JA,
97                                         const InputInfo &Output,
98                                         const InputInfoList &Inputs,
99                                         const ArgList &Args,
100                                         const char *LinkingOutput) const {
101   const ToolChain &TC = getToolChain();
102   const Driver &D = TC.getDriver();
103   const SanitizerArgs &Sanitize = TC.getSanitizerArgs(Args);
104 
105   ArgStringList CmdArgs;
106 
107   // Silence warning for "clang -g foo.o -o foo"
108   Args.ClaimAllArgs(options::OPT_g_Group);
109   // and "clang -emit-llvm foo.o -o foo"
110   Args.ClaimAllArgs(options::OPT_emit_llvm);
111   // and for "clang -w foo.o -o foo". Other warning options are already
112   // handled somewhere else.
113   Args.ClaimAllArgs(options::OPT_w);
114 
115   if (!D.SysRoot.empty())
116     CmdArgs.push_back(Args.MakeArgString("--sysroot=" + D.SysRoot));
117 
118   if (Args.hasArg(options::OPT_s))
119     CmdArgs.push_back("-s");
120 
121   CmdArgs.push_back("-m");
122   switch (TC.getArch()) {
123   case llvm::Triple::x86:
124     CmdArgs.push_back("i386pe");
125     break;
126   case llvm::Triple::x86_64:
127     CmdArgs.push_back("i386pep");
128     break;
129   case llvm::Triple::arm:
130   case llvm::Triple::thumb:
131     // FIXME: this is incorrect for WinCE
132     CmdArgs.push_back("thumb2pe");
133     break;
134   case llvm::Triple::aarch64:
135     CmdArgs.push_back("arm64pe");
136     break;
137   default:
138     llvm_unreachable("Unsupported target architecture.");
139   }
140 
141   Arg *SubsysArg =
142       Args.getLastArg(options::OPT_mwindows, options::OPT_mconsole);
143   if (SubsysArg && SubsysArg->getOption().matches(options::OPT_mwindows)) {
144     CmdArgs.push_back("--subsystem");
145     CmdArgs.push_back("windows");
146   } else if (SubsysArg &&
147              SubsysArg->getOption().matches(options::OPT_mconsole)) {
148     CmdArgs.push_back("--subsystem");
149     CmdArgs.push_back("console");
150   }
151 
152   if (Args.hasArg(options::OPT_mdll))
153     CmdArgs.push_back("--dll");
154   else if (Args.hasArg(options::OPT_shared))
155     CmdArgs.push_back("--shared");
156   if (Args.hasArg(options::OPT_static))
157     CmdArgs.push_back("-Bstatic");
158   else
159     CmdArgs.push_back("-Bdynamic");
160   if (Args.hasArg(options::OPT_mdll) || Args.hasArg(options::OPT_shared)) {
161     CmdArgs.push_back("-e");
162     if (TC.getArch() == llvm::Triple::x86)
163       CmdArgs.push_back("_DllMainCRTStartup@12");
164     else
165       CmdArgs.push_back("DllMainCRTStartup");
166     CmdArgs.push_back("--enable-auto-image-base");
167   }
168 
169   if (Args.hasArg(options::OPT_Z_Xlinker__no_demangle))
170     CmdArgs.push_back("--no-demangle");
171 
172   CmdArgs.push_back("-o");
173   const char *OutputFile = Output.getFilename();
174   // GCC implicitly adds an .exe extension if it is given an output file name
175   // that lacks an extension.
176   // GCC used to do this only when the compiler itself runs on windows, but
177   // since GCC 8 it does the same when cross compiling as well.
178   if (!llvm::sys::path::has_extension(OutputFile)) {
179     CmdArgs.push_back(Args.MakeArgString(Twine(OutputFile) + ".exe"));
180     OutputFile = CmdArgs.back();
181   } else
182     CmdArgs.push_back(OutputFile);
183 
184   Args.AddAllArgs(CmdArgs, options::OPT_e);
185   // FIXME: add -N, -n flags
186   Args.AddLastArg(CmdArgs, options::OPT_r);
187   Args.AddLastArg(CmdArgs, options::OPT_s);
188   Args.AddLastArg(CmdArgs, options::OPT_t);
189   Args.AddAllArgs(CmdArgs, options::OPT_u_Group);
190   Args.AddLastArg(CmdArgs, options::OPT_Z_Flag);
191 
192   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles)) {
193     if (Args.hasArg(options::OPT_shared) || Args.hasArg(options::OPT_mdll)) {
194       CmdArgs.push_back(Args.MakeArgString(TC.GetFilePath("dllcrt2.o")));
195     } else {
196       if (Args.hasArg(options::OPT_municode))
197         CmdArgs.push_back(Args.MakeArgString(TC.GetFilePath("crt2u.o")));
198       else
199         CmdArgs.push_back(Args.MakeArgString(TC.GetFilePath("crt2.o")));
200     }
201     if (Args.hasArg(options::OPT_pg))
202       CmdArgs.push_back(Args.MakeArgString(TC.GetFilePath("gcrt2.o")));
203     CmdArgs.push_back(Args.MakeArgString(TC.GetFilePath("crtbegin.o")));
204   }
205 
206   Args.AddAllArgs(CmdArgs, options::OPT_L);
207   TC.AddFilePathLibArgs(Args, CmdArgs);
208 
209   // Add the compiler-rt library directories if they exist to help
210   // the linker find the various sanitizer, builtin, and profiling runtimes.
211   for (const auto &LibPath : TC.getLibraryPaths()) {
212     if (TC.getVFS().exists(LibPath))
213       CmdArgs.push_back(Args.MakeArgString("-L" + LibPath));
214   }
215   auto CRTPath = TC.getCompilerRTPath();
216   if (TC.getVFS().exists(CRTPath))
217     CmdArgs.push_back(Args.MakeArgString("-L" + CRTPath));
218 
219   AddLinkerInputs(TC, Inputs, Args, CmdArgs, JA);
220 
221   // TODO: Add profile stuff here
222 
223   if (TC.ShouldLinkCXXStdlib(Args)) {
224     bool OnlyLibstdcxxStatic = Args.hasArg(options::OPT_static_libstdcxx) &&
225                                !Args.hasArg(options::OPT_static);
226     if (OnlyLibstdcxxStatic)
227       CmdArgs.push_back("-Bstatic");
228     TC.AddCXXStdlibLibArgs(Args, CmdArgs);
229     if (OnlyLibstdcxxStatic)
230       CmdArgs.push_back("-Bdynamic");
231   }
232 
233   bool HasWindowsApp = false;
234   for (auto Lib : Args.getAllArgValues(options::OPT_l)) {
235     if (Lib == "windowsapp") {
236       HasWindowsApp = true;
237       break;
238     }
239   }
240 
241   if (!Args.hasArg(options::OPT_nostdlib)) {
242     if (!Args.hasArg(options::OPT_nodefaultlibs)) {
243       if (Args.hasArg(options::OPT_static))
244         CmdArgs.push_back("--start-group");
245 
246       if (Args.hasArg(options::OPT_fstack_protector) ||
247           Args.hasArg(options::OPT_fstack_protector_strong) ||
248           Args.hasArg(options::OPT_fstack_protector_all)) {
249         CmdArgs.push_back("-lssp_nonshared");
250         CmdArgs.push_back("-lssp");
251       }
252 
253       if (Args.hasFlag(options::OPT_fopenmp, options::OPT_fopenmp_EQ,
254                        options::OPT_fno_openmp, false)) {
255         switch (TC.getDriver().getOpenMPRuntime(Args)) {
256         case Driver::OMPRT_OMP:
257           CmdArgs.push_back("-lomp");
258           break;
259         case Driver::OMPRT_IOMP5:
260           CmdArgs.push_back("-liomp5md");
261           break;
262         case Driver::OMPRT_GOMP:
263           CmdArgs.push_back("-lgomp");
264           break;
265         case Driver::OMPRT_Unknown:
266           // Already diagnosed.
267           break;
268         }
269       }
270 
271       AddLibGCC(Args, CmdArgs);
272 
273       if (Args.hasArg(options::OPT_pg))
274         CmdArgs.push_back("-lgmon");
275 
276       if (Args.hasArg(options::OPT_pthread))
277         CmdArgs.push_back("-lpthread");
278 
279       if (Sanitize.needsAsanRt()) {
280         // MinGW always links against a shared MSVCRT.
281         CmdArgs.push_back(TC.getCompilerRTArgString(Args, "asan_dynamic",
282                                                     ToolChain::FT_Shared));
283         CmdArgs.push_back(
284             TC.getCompilerRTArgString(Args, "asan_dynamic_runtime_thunk"));
285         CmdArgs.push_back("--require-defined");
286         CmdArgs.push_back(TC.getArch() == llvm::Triple::x86
287                               ? "___asan_seh_interceptor"
288                               : "__asan_seh_interceptor");
289         // Make sure the linker consider all object files from the dynamic
290         // runtime thunk.
291         CmdArgs.push_back("--whole-archive");
292         CmdArgs.push_back(
293             TC.getCompilerRTArgString(Args, "asan_dynamic_runtime_thunk"));
294         CmdArgs.push_back("--no-whole-archive");
295       }
296 
297       TC.addProfileRTLibs(Args, CmdArgs);
298 
299       if (!HasWindowsApp) {
300         // Add system libraries. If linking to libwindowsapp.a, that import
301         // library replaces all these and we shouldn't accidentally try to
302         // link to the normal desktop mode dlls.
303         if (Args.hasArg(options::OPT_mwindows)) {
304           CmdArgs.push_back("-lgdi32");
305           CmdArgs.push_back("-lcomdlg32");
306         }
307         CmdArgs.push_back("-ladvapi32");
308         CmdArgs.push_back("-lshell32");
309         CmdArgs.push_back("-luser32");
310         CmdArgs.push_back("-lkernel32");
311       }
312 
313       if (Args.hasArg(options::OPT_static)) {
314         CmdArgs.push_back("--end-group");
315       } else {
316         AddLibGCC(Args, CmdArgs);
317         if (!HasWindowsApp)
318           CmdArgs.push_back("-lkernel32");
319       }
320     }
321 
322     if (!Args.hasArg(options::OPT_nostartfiles)) {
323       // Add crtfastmath.o if available and fast math is enabled.
324       TC.addFastMathRuntimeIfAvailable(Args, CmdArgs);
325 
326       CmdArgs.push_back(Args.MakeArgString(TC.GetFilePath("crtend.o")));
327     }
328   }
329   const char *Exec = Args.MakeArgString(TC.GetLinkerPath());
330   C.addCommand(std::make_unique<Command>(JA, *this,
331                                          ResponseFileSupport::AtFileUTF8(),
332                                          Exec, CmdArgs, Inputs, Output));
333 }
334 
335 // Simplified from Generic_GCC::GCCInstallationDetector::ScanLibDirForGCCTriple.
336 static bool findGccVersion(StringRef LibDir, std::string &GccLibDir,
337                            std::string &Ver) {
338   auto Version = toolchains::Generic_GCC::GCCVersion::Parse("0.0.0");
339   std::error_code EC;
340   for (llvm::sys::fs::directory_iterator LI(LibDir, EC), LE; !EC && LI != LE;
341        LI = LI.increment(EC)) {
342     StringRef VersionText = llvm::sys::path::filename(LI->path());
343     auto CandidateVersion =
344         toolchains::Generic_GCC::GCCVersion::Parse(VersionText);
345     if (CandidateVersion.Major == -1)
346       continue;
347     if (CandidateVersion <= Version)
348       continue;
349     Version = CandidateVersion;
350     Ver = std::string(VersionText);
351     GccLibDir = LI->path();
352   }
353   return Ver.size();
354 }
355 
356 void toolchains::MinGW::findGccLibDir() {
357   llvm::SmallVector<llvm::SmallString<32>, 2> SubdirNames;
358   SubdirNames.emplace_back(getTriple().getArchName());
359   SubdirNames[0] += "-w64-mingw32";
360   SubdirNames.emplace_back("mingw32");
361   if (SubdirName.empty())
362     SubdirName = std::string(SubdirNames[0].str());
363   // lib: Arch Linux, Ubuntu, Windows
364   // lib64: openSUSE Linux
365   for (StringRef CandidateLib : {"lib", "lib64"}) {
366     for (StringRef CandidateSysroot : SubdirNames) {
367       llvm::SmallString<1024> LibDir(Base);
368       llvm::sys::path::append(LibDir, CandidateLib, "gcc", CandidateSysroot);
369       if (findGccVersion(LibDir, GccLibDir, Ver)) {
370         SubdirName = std::string(CandidateSysroot);
371         return;
372       }
373     }
374   }
375 }
376 
377 static llvm::ErrorOr<std::string> findGcc(const llvm::Triple &T) {
378   llvm::SmallVector<llvm::SmallString<32>, 2> Gccs;
379   Gccs.emplace_back(T.getArchName());
380   Gccs[0] += "-w64-mingw32-gcc";
381   Gccs.emplace_back("mingw32-gcc");
382   // Please do not add "gcc" here
383   for (StringRef CandidateGcc : Gccs)
384     if (llvm::ErrorOr<std::string> GPPName = llvm::sys::findProgramByName(CandidateGcc))
385       return GPPName;
386   return make_error_code(std::errc::no_such_file_or_directory);
387 }
388 
389 static llvm::ErrorOr<std::string>
390 findClangRelativeSysroot(const Driver &D, const llvm::Triple &T,
391                          std::string &SubdirName) {
392   llvm::SmallVector<llvm::SmallString<32>, 2> Subdirs;
393   Subdirs.emplace_back(T.str());
394   Subdirs.emplace_back(T.getArchName());
395   Subdirs[1] += "-w64-mingw32";
396   StringRef ClangRoot = llvm::sys::path::parent_path(D.getInstalledDir());
397   StringRef Sep = llvm::sys::path::get_separator();
398   for (StringRef CandidateSubdir : Subdirs) {
399     if (llvm::sys::fs::is_directory(ClangRoot + Sep + CandidateSubdir)) {
400       SubdirName = std::string(CandidateSubdir);
401       return (ClangRoot + Sep + CandidateSubdir).str();
402     }
403   }
404   return make_error_code(std::errc::no_such_file_or_directory);
405 }
406 
407 toolchains::MinGW::MinGW(const Driver &D, const llvm::Triple &Triple,
408                          const ArgList &Args)
409     : ToolChain(D, Triple, Args), CudaInstallation(D, Triple, Args),
410       RocmInstallation(D, Triple, Args) {
411   getProgramPaths().push_back(getDriver().getInstalledDir());
412 
413   // The sequence for detecting a sysroot here should be kept in sync with
414   // the testTriple function below.
415   if (getDriver().SysRoot.size())
416     Base = getDriver().SysRoot;
417   // Look for <clang-bin>/../<triplet>; if found, use <clang-bin>/.. as the
418   // base as it could still be a base for a gcc setup with libgcc.
419   else if (llvm::ErrorOr<std::string> TargetSubdir =
420                findClangRelativeSysroot(getDriver(), getTriple(), SubdirName))
421     Base = std::string(llvm::sys::path::parent_path(TargetSubdir.get()));
422   else if (llvm::ErrorOr<std::string> GPPName = findGcc(getTriple()))
423     Base = std::string(llvm::sys::path::parent_path(
424         llvm::sys::path::parent_path(GPPName.get())));
425   else
426     Base = std::string(
427         llvm::sys::path::parent_path(getDriver().getInstalledDir()));
428 
429   Base += llvm::sys::path::get_separator();
430   findGccLibDir();
431   // GccLibDir must precede Base/lib so that the
432   // correct crtbegin.o ,cetend.o would be found.
433   getFilePaths().push_back(GccLibDir);
434   getFilePaths().push_back(
435       (Base + SubdirName + llvm::sys::path::get_separator() + "lib").str());
436   getFilePaths().push_back(Base + "lib");
437   // openSUSE
438   getFilePaths().push_back(Base + SubdirName + "/sys-root/mingw/lib");
439 
440   NativeLLVMSupport =
441       Args.getLastArgValue(options::OPT_fuse_ld_EQ, CLANG_DEFAULT_LINKER)
442           .equals_insensitive("lld");
443 }
444 
445 bool toolchains::MinGW::IsIntegratedAssemblerDefault() const { return true; }
446 
447 Tool *toolchains::MinGW::getTool(Action::ActionClass AC) const {
448   switch (AC) {
449   case Action::PreprocessJobClass:
450     if (!Preprocessor)
451       Preprocessor.reset(new tools::gcc::Preprocessor(*this));
452     return Preprocessor.get();
453   case Action::CompileJobClass:
454     if (!Compiler)
455       Compiler.reset(new tools::gcc::Compiler(*this));
456     return Compiler.get();
457   default:
458     return ToolChain::getTool(AC);
459   }
460 }
461 
462 Tool *toolchains::MinGW::buildAssembler() const {
463   return new tools::MinGW::Assembler(*this);
464 }
465 
466 Tool *toolchains::MinGW::buildLinker() const {
467   return new tools::MinGW::Linker(*this);
468 }
469 
470 bool toolchains::MinGW::HasNativeLLVMSupport() const {
471   return NativeLLVMSupport;
472 }
473 
474 bool toolchains::MinGW::IsUnwindTablesDefault(const ArgList &Args) const {
475   Arg *ExceptionArg = Args.getLastArg(options::OPT_fsjlj_exceptions,
476                                       options::OPT_fseh_exceptions,
477                                       options::OPT_fdwarf_exceptions);
478   if (ExceptionArg &&
479       ExceptionArg->getOption().matches(options::OPT_fseh_exceptions))
480     return true;
481   return getArch() == llvm::Triple::x86_64 ||
482          getArch() == llvm::Triple::aarch64;
483 }
484 
485 bool toolchains::MinGW::isPICDefault() const {
486   return getArch() == llvm::Triple::x86_64 ||
487          getArch() == llvm::Triple::aarch64;
488 }
489 
490 bool toolchains::MinGW::isPIEDefault(const llvm::opt::ArgList &Args) const {
491   return false;
492 }
493 
494 bool toolchains::MinGW::isPICDefaultForced() const { return true; }
495 
496 llvm::ExceptionHandling
497 toolchains::MinGW::GetExceptionModel(const ArgList &Args) const {
498   if (getArch() == llvm::Triple::x86_64 || getArch() == llvm::Triple::aarch64)
499     return llvm::ExceptionHandling::WinEH;
500   return llvm::ExceptionHandling::DwarfCFI;
501 }
502 
503 SanitizerMask toolchains::MinGW::getSupportedSanitizers() const {
504   SanitizerMask Res = ToolChain::getSupportedSanitizers();
505   Res |= SanitizerKind::Address;
506   Res |= SanitizerKind::PointerCompare;
507   Res |= SanitizerKind::PointerSubtract;
508   Res |= SanitizerKind::Vptr;
509   return Res;
510 }
511 
512 void toolchains::MinGW::AddCudaIncludeArgs(const ArgList &DriverArgs,
513                                            ArgStringList &CC1Args) const {
514   CudaInstallation.AddCudaIncludeArgs(DriverArgs, CC1Args);
515 }
516 
517 void toolchains::MinGW::AddHIPIncludeArgs(const ArgList &DriverArgs,
518                                           ArgStringList &CC1Args) const {
519   RocmInstallation.AddHIPIncludeArgs(DriverArgs, CC1Args);
520 }
521 
522 void toolchains::MinGW::printVerboseInfo(raw_ostream &OS) const {
523   CudaInstallation.print(OS);
524   RocmInstallation.print(OS);
525 }
526 
527 // Include directories for various hosts:
528 
529 // Windows, mingw.org
530 // c:\mingw\lib\gcc\mingw32\4.8.1\include\c++
531 // c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\mingw32
532 // c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\backward
533 // c:\mingw\include
534 // c:\mingw\mingw32\include
535 
536 // Windows, mingw-w64 mingw-builds
537 // c:\mingw32\i686-w64-mingw32\include
538 // c:\mingw32\i686-w64-mingw32\include\c++
539 // c:\mingw32\i686-w64-mingw32\include\c++\i686-w64-mingw32
540 // c:\mingw32\i686-w64-mingw32\include\c++\backward
541 
542 // Windows, mingw-w64 msys2
543 // c:\msys64\mingw32\include
544 // c:\msys64\mingw32\i686-w64-mingw32\include
545 // c:\msys64\mingw32\include\c++\4.9.2
546 // c:\msys64\mingw32\include\c++\4.9.2\i686-w64-mingw32
547 // c:\msys64\mingw32\include\c++\4.9.2\backward
548 
549 // openSUSE
550 // /usr/lib64/gcc/x86_64-w64-mingw32/5.1.0/include/c++
551 // /usr/lib64/gcc/x86_64-w64-mingw32/5.1.0/include/c++/x86_64-w64-mingw32
552 // /usr/lib64/gcc/x86_64-w64-mingw32/5.1.0/include/c++/backward
553 // /usr/x86_64-w64-mingw32/sys-root/mingw/include
554 
555 // Arch Linux
556 // /usr/i686-w64-mingw32/include/c++/5.1.0
557 // /usr/i686-w64-mingw32/include/c++/5.1.0/i686-w64-mingw32
558 // /usr/i686-w64-mingw32/include/c++/5.1.0/backward
559 // /usr/i686-w64-mingw32/include
560 
561 // Ubuntu
562 // /usr/include/c++/4.8
563 // /usr/include/c++/4.8/x86_64-w64-mingw32
564 // /usr/include/c++/4.8/backward
565 // /usr/x86_64-w64-mingw32/include
566 
567 void toolchains::MinGW::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
568                                                   ArgStringList &CC1Args) const {
569   if (DriverArgs.hasArg(options::OPT_nostdinc))
570     return;
571 
572   if (!DriverArgs.hasArg(options::OPT_nobuiltininc)) {
573     SmallString<1024> P(getDriver().ResourceDir);
574     llvm::sys::path::append(P, "include");
575     addSystemInclude(DriverArgs, CC1Args, P.str());
576   }
577 
578   if (DriverArgs.hasArg(options::OPT_nostdlibinc))
579     return;
580 
581   if (GetRuntimeLibType(DriverArgs) == ToolChain::RLT_Libgcc) {
582     // openSUSE
583     addSystemInclude(DriverArgs, CC1Args,
584                      Base + SubdirName + "/sys-root/mingw/include");
585   }
586 
587   addSystemInclude(DriverArgs, CC1Args,
588                    Base + SubdirName + llvm::sys::path::get_separator() +
589                        "include");
590   addSystemInclude(DriverArgs, CC1Args, Base + "include");
591 }
592 
593 void toolchains::MinGW::AddClangCXXStdlibIncludeArgs(
594     const ArgList &DriverArgs, ArgStringList &CC1Args) const {
595   if (DriverArgs.hasArg(options::OPT_nostdlibinc) ||
596       DriverArgs.hasArg(options::OPT_nostdincxx))
597     return;
598 
599   StringRef Slash = llvm::sys::path::get_separator();
600 
601   switch (GetCXXStdlibType(DriverArgs)) {
602   case ToolChain::CST_Libcxx: {
603     std::string TargetDir = (Base + "include" + Slash + getTripleString() +
604                              Slash + "c++" + Slash + "v1")
605                                 .str();
606     if (getDriver().getVFS().exists(TargetDir))
607       addSystemInclude(DriverArgs, CC1Args, TargetDir);
608     addSystemInclude(DriverArgs, CC1Args,
609                      Base + SubdirName + Slash + "include" + Slash + "c++" +
610                          Slash + "v1");
611     addSystemInclude(DriverArgs, CC1Args,
612                      Base + "include" + Slash + "c++" + Slash + "v1");
613     break;
614   }
615 
616   case ToolChain::CST_Libstdcxx:
617     llvm::SmallVector<llvm::SmallString<1024>, 4> CppIncludeBases;
618     CppIncludeBases.emplace_back(Base);
619     llvm::sys::path::append(CppIncludeBases[0], SubdirName, "include", "c++");
620     CppIncludeBases.emplace_back(Base);
621     llvm::sys::path::append(CppIncludeBases[1], SubdirName, "include", "c++",
622                             Ver);
623     CppIncludeBases.emplace_back(Base);
624     llvm::sys::path::append(CppIncludeBases[2], "include", "c++", Ver);
625     CppIncludeBases.emplace_back(GccLibDir);
626     llvm::sys::path::append(CppIncludeBases[3], "include", "c++");
627     for (auto &CppIncludeBase : CppIncludeBases) {
628       addSystemInclude(DriverArgs, CC1Args, CppIncludeBase);
629       CppIncludeBase += Slash;
630       addSystemInclude(DriverArgs, CC1Args, CppIncludeBase + SubdirName);
631       addSystemInclude(DriverArgs, CC1Args, CppIncludeBase + "backward");
632     }
633     break;
634   }
635 }
636 
637 static bool testTriple(const Driver &D, const llvm::Triple &Triple,
638                        const ArgList &Args) {
639   // If an explicit sysroot is set, that will be used and we shouldn't try to
640   // detect anything else.
641   std::string SubdirName;
642   if (D.SysRoot.size())
643     return true;
644   if (llvm::ErrorOr<std::string> TargetSubdir =
645           findClangRelativeSysroot(D, Triple, SubdirName))
646     return true;
647   if (llvm::ErrorOr<std::string> GPPName = findGcc(Triple))
648     return true;
649   // If we neither found a colocated sysroot or a matching gcc executable,
650   // conclude that we can't know if this is the correct spelling of the triple.
651   return false;
652 }
653 
654 static llvm::Triple adjustTriple(const Driver &D, const llvm::Triple &Triple,
655                                  const ArgList &Args) {
656   // First test if the original triple can find a sysroot with the triple
657   // name.
658   if (testTriple(D, Triple, Args))
659     return Triple;
660   llvm::SmallVector<llvm::StringRef, 3> Archs;
661   // If not, test a couple other possible arch names that might be what was
662   // intended.
663   if (Triple.getArch() == llvm::Triple::x86) {
664     Archs.emplace_back("i386");
665     Archs.emplace_back("i586");
666     Archs.emplace_back("i686");
667   } else if (Triple.getArch() == llvm::Triple::arm ||
668              Triple.getArch() == llvm::Triple::thumb) {
669     Archs.emplace_back("armv7");
670   }
671   for (auto A : Archs) {
672     llvm::Triple TestTriple(Triple);
673     TestTriple.setArchName(A);
674     if (testTriple(D, TestTriple, Args))
675       return TestTriple;
676   }
677   // If none was found, just proceed with the original value.
678   return Triple;
679 }
680 
681 void toolchains::MinGW::fixTripleArch(const Driver &D, llvm::Triple &Triple,
682                                       const ArgList &Args) {
683   if (Triple.getArch() == llvm::Triple::x86 ||
684       Triple.getArch() == llvm::Triple::arm ||
685       Triple.getArch() == llvm::Triple::thumb)
686     Triple = adjustTriple(D, Triple, Args);
687 }
688