xref: /freebsd/contrib/llvm-project/clang/lib/Driver/ToolChains/MinGW.cpp (revision c9539b89010900499a200cdd6c0265ea5d950875) 
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   if (C.getDriver().IsFlangMode()) {
222     addFortranRuntimeLibraryPath(TC, Args, CmdArgs);
223     addFortranRuntimeLibs(TC, CmdArgs);
224   }
225 
226   // TODO: Add profile stuff here
227 
228   if (TC.ShouldLinkCXXStdlib(Args)) {
229     bool OnlyLibstdcxxStatic = Args.hasArg(options::OPT_static_libstdcxx) &&
230                                !Args.hasArg(options::OPT_static);
231     if (OnlyLibstdcxxStatic)
232       CmdArgs.push_back("-Bstatic");
233     TC.AddCXXStdlibLibArgs(Args, CmdArgs);
234     if (OnlyLibstdcxxStatic)
235       CmdArgs.push_back("-Bdynamic");
236   }
237 
238   bool HasWindowsApp = false;
239   for (auto Lib : Args.getAllArgValues(options::OPT_l)) {
240     if (Lib == "windowsapp") {
241       HasWindowsApp = true;
242       break;
243     }
244   }
245 
246   if (!Args.hasArg(options::OPT_nostdlib)) {
247     if (!Args.hasArg(options::OPT_nodefaultlibs)) {
248       if (Args.hasArg(options::OPT_static))
249         CmdArgs.push_back("--start-group");
250 
251       if (Args.hasArg(options::OPT_fstack_protector) ||
252           Args.hasArg(options::OPT_fstack_protector_strong) ||
253           Args.hasArg(options::OPT_fstack_protector_all)) {
254         CmdArgs.push_back("-lssp_nonshared");
255         CmdArgs.push_back("-lssp");
256       }
257 
258       if (Args.hasFlag(options::OPT_fopenmp, options::OPT_fopenmp_EQ,
259                        options::OPT_fno_openmp, false)) {
260         switch (TC.getDriver().getOpenMPRuntime(Args)) {
261         case Driver::OMPRT_OMP:
262           CmdArgs.push_back("-lomp");
263           break;
264         case Driver::OMPRT_IOMP5:
265           CmdArgs.push_back("-liomp5md");
266           break;
267         case Driver::OMPRT_GOMP:
268           CmdArgs.push_back("-lgomp");
269           break;
270         case Driver::OMPRT_Unknown:
271           // Already diagnosed.
272           break;
273         }
274       }
275 
276       AddLibGCC(Args, CmdArgs);
277 
278       if (Args.hasArg(options::OPT_pg))
279         CmdArgs.push_back("-lgmon");
280 
281       if (Args.hasArg(options::OPT_pthread))
282         CmdArgs.push_back("-lpthread");
283 
284       if (Sanitize.needsAsanRt()) {
285         // MinGW always links against a shared MSVCRT.
286         CmdArgs.push_back(TC.getCompilerRTArgString(Args, "asan_dynamic",
287                                                     ToolChain::FT_Shared));
288         CmdArgs.push_back(
289             TC.getCompilerRTArgString(Args, "asan_dynamic_runtime_thunk"));
290         CmdArgs.push_back("--require-defined");
291         CmdArgs.push_back(TC.getArch() == llvm::Triple::x86
292                               ? "___asan_seh_interceptor"
293                               : "__asan_seh_interceptor");
294         // Make sure the linker consider all object files from the dynamic
295         // runtime thunk.
296         CmdArgs.push_back("--whole-archive");
297         CmdArgs.push_back(
298             TC.getCompilerRTArgString(Args, "asan_dynamic_runtime_thunk"));
299         CmdArgs.push_back("--no-whole-archive");
300       }
301 
302       TC.addProfileRTLibs(Args, CmdArgs);
303 
304       if (!HasWindowsApp) {
305         // Add system libraries. If linking to libwindowsapp.a, that import
306         // library replaces all these and we shouldn't accidentally try to
307         // link to the normal desktop mode dlls.
308         if (Args.hasArg(options::OPT_mwindows)) {
309           CmdArgs.push_back("-lgdi32");
310           CmdArgs.push_back("-lcomdlg32");
311         }
312         CmdArgs.push_back("-ladvapi32");
313         CmdArgs.push_back("-lshell32");
314         CmdArgs.push_back("-luser32");
315         CmdArgs.push_back("-lkernel32");
316       }
317 
318       if (Args.hasArg(options::OPT_static)) {
319         CmdArgs.push_back("--end-group");
320       } else {
321         AddLibGCC(Args, CmdArgs);
322         if (!HasWindowsApp)
323           CmdArgs.push_back("-lkernel32");
324       }
325     }
326 
327     if (!Args.hasArg(options::OPT_nostartfiles)) {
328       // Add crtfastmath.o if available and fast math is enabled.
329       TC.addFastMathRuntimeIfAvailable(Args, CmdArgs);
330 
331       CmdArgs.push_back(Args.MakeArgString(TC.GetFilePath("crtend.o")));
332     }
333   }
334   const char *Exec = Args.MakeArgString(TC.GetLinkerPath());
335   C.addCommand(std::make_unique<Command>(JA, *this,
336                                          ResponseFileSupport::AtFileUTF8(),
337                                          Exec, CmdArgs, Inputs, Output));
338 }
339 
340 // Simplified from Generic_GCC::GCCInstallationDetector::ScanLibDirForGCCTriple.
341 static bool findGccVersion(StringRef LibDir, std::string &GccLibDir,
342                            std::string &Ver,
343                            toolchains::Generic_GCC::GCCVersion &Version) {
344   Version = toolchains::Generic_GCC::GCCVersion::Parse("0.0.0");
345   std::error_code EC;
346   for (llvm::sys::fs::directory_iterator LI(LibDir, EC), LE; !EC && LI != LE;
347        LI = LI.increment(EC)) {
348     StringRef VersionText = llvm::sys::path::filename(LI->path());
349     auto CandidateVersion =
350         toolchains::Generic_GCC::GCCVersion::Parse(VersionText);
351     if (CandidateVersion.Major == -1)
352       continue;
353     if (CandidateVersion <= Version)
354       continue;
355     Version = CandidateVersion;
356     Ver = std::string(VersionText);
357     GccLibDir = LI->path();
358   }
359   return Ver.size();
360 }
361 
362 void toolchains::MinGW::findGccLibDir() {
363   llvm::SmallVector<llvm::SmallString<32>, 2> SubdirNames;
364   SubdirNames.emplace_back(getTriple().getArchName());
365   SubdirNames[0] += "-w64-mingw32";
366   SubdirNames.emplace_back("mingw32");
367   if (SubdirName.empty())
368     SubdirName = std::string(SubdirNames[0].str());
369   // lib: Arch Linux, Ubuntu, Windows
370   // lib64: openSUSE Linux
371   for (StringRef CandidateLib : {"lib", "lib64"}) {
372     for (StringRef CandidateSysroot : SubdirNames) {
373       llvm::SmallString<1024> LibDir(Base);
374       llvm::sys::path::append(LibDir, CandidateLib, "gcc", CandidateSysroot);
375       if (findGccVersion(LibDir, GccLibDir, Ver, GccVer)) {
376         SubdirName = std::string(CandidateSysroot);
377         return;
378       }
379     }
380   }
381 }
382 
383 static llvm::ErrorOr<std::string> findGcc(const llvm::Triple &T) {
384   llvm::SmallVector<llvm::SmallString<32>, 2> Gccs;
385   Gccs.emplace_back(T.getArchName());
386   Gccs[0] += "-w64-mingw32-gcc";
387   Gccs.emplace_back("mingw32-gcc");
388   // Please do not add "gcc" here
389   for (StringRef CandidateGcc : Gccs)
390     if (llvm::ErrorOr<std::string> GPPName = llvm::sys::findProgramByName(CandidateGcc))
391       return GPPName;
392   return make_error_code(std::errc::no_such_file_or_directory);
393 }
394 
395 static llvm::ErrorOr<std::string>
396 findClangRelativeSysroot(const Driver &D, const llvm::Triple &T,
397                          std::string &SubdirName) {
398   llvm::SmallVector<llvm::SmallString<32>, 2> Subdirs;
399   Subdirs.emplace_back(T.str());
400   Subdirs.emplace_back(T.getArchName());
401   Subdirs[1] += "-w64-mingw32";
402   StringRef ClangRoot = llvm::sys::path::parent_path(D.getInstalledDir());
403   StringRef Sep = llvm::sys::path::get_separator();
404   for (StringRef CandidateSubdir : Subdirs) {
405     if (llvm::sys::fs::is_directory(ClangRoot + Sep + CandidateSubdir)) {
406       SubdirName = std::string(CandidateSubdir);
407       return (ClangRoot + Sep + CandidateSubdir).str();
408     }
409   }
410   return make_error_code(std::errc::no_such_file_or_directory);
411 }
412 
413 toolchains::MinGW::MinGW(const Driver &D, const llvm::Triple &Triple,
414                          const ArgList &Args)
415     : ToolChain(D, Triple, Args), CudaInstallation(D, Triple, Args),
416       RocmInstallation(D, Triple, Args) {
417   getProgramPaths().push_back(getDriver().getInstalledDir());
418 
419   // The sequence for detecting a sysroot here should be kept in sync with
420   // the testTriple function below.
421   if (getDriver().SysRoot.size())
422     Base = getDriver().SysRoot;
423   // Look for <clang-bin>/../<triplet>; if found, use <clang-bin>/.. as the
424   // base as it could still be a base for a gcc setup with libgcc.
425   else if (llvm::ErrorOr<std::string> TargetSubdir =
426                findClangRelativeSysroot(getDriver(), getTriple(), SubdirName))
427     Base = std::string(llvm::sys::path::parent_path(TargetSubdir.get()));
428   else if (llvm::ErrorOr<std::string> GPPName = findGcc(getTriple()))
429     Base = std::string(llvm::sys::path::parent_path(
430         llvm::sys::path::parent_path(GPPName.get())));
431   else
432     Base = std::string(
433         llvm::sys::path::parent_path(getDriver().getInstalledDir()));
434 
435   Base += llvm::sys::path::get_separator();
436   findGccLibDir();
437   // GccLibDir must precede Base/lib so that the
438   // correct crtbegin.o ,cetend.o would be found.
439   getFilePaths().push_back(GccLibDir);
440   getFilePaths().push_back(
441       (Base + SubdirName + llvm::sys::path::get_separator() + "lib").str());
442 
443   // Gentoo
444   getFilePaths().push_back(
445       (Base + SubdirName + llvm::sys::path::get_separator() + "mingw/lib").str());
446 
447   getFilePaths().push_back(Base + "lib");
448   // openSUSE
449   getFilePaths().push_back(Base + SubdirName + "/sys-root/mingw/lib");
450 
451   NativeLLVMSupport =
452       Args.getLastArgValue(options::OPT_fuse_ld_EQ, CLANG_DEFAULT_LINKER)
453           .equals_insensitive("lld");
454 }
455 
456 bool toolchains::MinGW::IsIntegratedAssemblerDefault() const { return true; }
457 
458 Tool *toolchains::MinGW::getTool(Action::ActionClass AC) const {
459   switch (AC) {
460   case Action::PreprocessJobClass:
461     if (!Preprocessor)
462       Preprocessor.reset(new tools::gcc::Preprocessor(*this));
463     return Preprocessor.get();
464   case Action::CompileJobClass:
465     if (!Compiler)
466       Compiler.reset(new tools::gcc::Compiler(*this));
467     return Compiler.get();
468   default:
469     return ToolChain::getTool(AC);
470   }
471 }
472 
473 Tool *toolchains::MinGW::buildAssembler() const {
474   return new tools::MinGW::Assembler(*this);
475 }
476 
477 Tool *toolchains::MinGW::buildLinker() const {
478   return new tools::MinGW::Linker(*this);
479 }
480 
481 bool toolchains::MinGW::HasNativeLLVMSupport() const {
482   return NativeLLVMSupport;
483 }
484 
485 bool toolchains::MinGW::IsUnwindTablesDefault(const ArgList &Args) const {
486   Arg *ExceptionArg = Args.getLastArg(options::OPT_fsjlj_exceptions,
487                                       options::OPT_fseh_exceptions,
488                                       options::OPT_fdwarf_exceptions);
489   if (ExceptionArg &&
490       ExceptionArg->getOption().matches(options::OPT_fseh_exceptions))
491     return true;
492   return getArch() == llvm::Triple::x86_64 || getArch() == llvm::Triple::arm ||
493          getArch() == llvm::Triple::thumb || getArch() == llvm::Triple::aarch64;
494 }
495 
496 bool toolchains::MinGW::isPICDefault() const {
497   return getArch() == llvm::Triple::x86_64 ||
498          getArch() == llvm::Triple::aarch64;
499 }
500 
501 bool toolchains::MinGW::isPIEDefault(const llvm::opt::ArgList &Args) const {
502   return false;
503 }
504 
505 bool toolchains::MinGW::isPICDefaultForced() const { return true; }
506 
507 llvm::ExceptionHandling
508 toolchains::MinGW::GetExceptionModel(const ArgList &Args) const {
509   if (getArch() == llvm::Triple::x86_64 || getArch() == llvm::Triple::aarch64 ||
510       getArch() == llvm::Triple::arm || getArch() == llvm::Triple::thumb)
511     return llvm::ExceptionHandling::WinEH;
512   return llvm::ExceptionHandling::DwarfCFI;
513 }
514 
515 SanitizerMask toolchains::MinGW::getSupportedSanitizers() const {
516   SanitizerMask Res = ToolChain::getSupportedSanitizers();
517   Res |= SanitizerKind::Address;
518   Res |= SanitizerKind::PointerCompare;
519   Res |= SanitizerKind::PointerSubtract;
520   Res |= SanitizerKind::Vptr;
521   return Res;
522 }
523 
524 void toolchains::MinGW::AddCudaIncludeArgs(const ArgList &DriverArgs,
525                                            ArgStringList &CC1Args) const {
526   CudaInstallation.AddCudaIncludeArgs(DriverArgs, CC1Args);
527 }
528 
529 void toolchains::MinGW::AddHIPIncludeArgs(const ArgList &DriverArgs,
530                                           ArgStringList &CC1Args) const {
531   RocmInstallation.AddHIPIncludeArgs(DriverArgs, CC1Args);
532 }
533 
534 void toolchains::MinGW::printVerboseInfo(raw_ostream &OS) const {
535   CudaInstallation.print(OS);
536   RocmInstallation.print(OS);
537 }
538 
539 // Include directories for various hosts:
540 
541 // Windows, mingw.org
542 // c:\mingw\lib\gcc\mingw32\4.8.1\include\c++
543 // c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\mingw32
544 // c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\backward
545 // c:\mingw\include
546 // c:\mingw\mingw32\include
547 
548 // Windows, mingw-w64 mingw-builds
549 // c:\mingw32\i686-w64-mingw32\include
550 // c:\mingw32\i686-w64-mingw32\include\c++
551 // c:\mingw32\i686-w64-mingw32\include\c++\i686-w64-mingw32
552 // c:\mingw32\i686-w64-mingw32\include\c++\backward
553 
554 // Windows, mingw-w64 msys2
555 // c:\msys64\mingw32\include
556 // c:\msys64\mingw32\i686-w64-mingw32\include
557 // c:\msys64\mingw32\include\c++\4.9.2
558 // c:\msys64\mingw32\include\c++\4.9.2\i686-w64-mingw32
559 // c:\msys64\mingw32\include\c++\4.9.2\backward
560 
561 // openSUSE
562 // /usr/lib64/gcc/x86_64-w64-mingw32/5.1.0/include/c++
563 // /usr/lib64/gcc/x86_64-w64-mingw32/5.1.0/include/c++/x86_64-w64-mingw32
564 // /usr/lib64/gcc/x86_64-w64-mingw32/5.1.0/include/c++/backward
565 // /usr/x86_64-w64-mingw32/sys-root/mingw/include
566 
567 // Arch Linux
568 // /usr/i686-w64-mingw32/include/c++/5.1.0
569 // /usr/i686-w64-mingw32/include/c++/5.1.0/i686-w64-mingw32
570 // /usr/i686-w64-mingw32/include/c++/5.1.0/backward
571 // /usr/i686-w64-mingw32/include
572 
573 // Ubuntu
574 // /usr/include/c++/4.8
575 // /usr/include/c++/4.8/x86_64-w64-mingw32
576 // /usr/include/c++/4.8/backward
577 // /usr/x86_64-w64-mingw32/include
578 
579 void toolchains::MinGW::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
580                                                   ArgStringList &CC1Args) const {
581   if (DriverArgs.hasArg(options::OPT_nostdinc))
582     return;
583 
584   if (!DriverArgs.hasArg(options::OPT_nobuiltininc)) {
585     SmallString<1024> P(getDriver().ResourceDir);
586     llvm::sys::path::append(P, "include");
587     addSystemInclude(DriverArgs, CC1Args, P.str());
588   }
589 
590   if (DriverArgs.hasArg(options::OPT_nostdlibinc))
591     return;
592 
593   if (GetRuntimeLibType(DriverArgs) == ToolChain::RLT_Libgcc) {
594     // openSUSE
595     addSystemInclude(DriverArgs, CC1Args,
596                      Base + SubdirName + "/sys-root/mingw/include");
597   }
598 
599   addSystemInclude(DriverArgs, CC1Args,
600                    Base + SubdirName + llvm::sys::path::get_separator() +
601                        "include");
602 
603   // Gentoo
604   addSystemInclude(DriverArgs, CC1Args,
605                    Base + SubdirName + llvm::sys::path::get_separator() + "usr/include");
606 
607   addSystemInclude(DriverArgs, CC1Args, Base + "include");
608 }
609 
610 void toolchains::MinGW::AddClangCXXStdlibIncludeArgs(
611     const ArgList &DriverArgs, ArgStringList &CC1Args) const {
612   if (DriverArgs.hasArg(options::OPT_nostdlibinc) ||
613       DriverArgs.hasArg(options::OPT_nostdincxx))
614     return;
615 
616   StringRef Slash = llvm::sys::path::get_separator();
617 
618   switch (GetCXXStdlibType(DriverArgs)) {
619   case ToolChain::CST_Libcxx: {
620     std::string TargetDir = (Base + "include" + Slash + getTripleString() +
621                              Slash + "c++" + Slash + "v1")
622                                 .str();
623     if (getDriver().getVFS().exists(TargetDir))
624       addSystemInclude(DriverArgs, CC1Args, TargetDir);
625     addSystemInclude(DriverArgs, CC1Args,
626                      Base + SubdirName + Slash + "include" + Slash + "c++" +
627                          Slash + "v1");
628     addSystemInclude(DriverArgs, CC1Args,
629                      Base + "include" + Slash + "c++" + Slash + "v1");
630     break;
631   }
632 
633   case ToolChain::CST_Libstdcxx:
634     llvm::SmallVector<llvm::SmallString<1024>, 7> CppIncludeBases;
635     CppIncludeBases.emplace_back(Base);
636     llvm::sys::path::append(CppIncludeBases[0], SubdirName, "include", "c++");
637     CppIncludeBases.emplace_back(Base);
638     llvm::sys::path::append(CppIncludeBases[1], SubdirName, "include", "c++",
639                             Ver);
640     CppIncludeBases.emplace_back(Base);
641     llvm::sys::path::append(CppIncludeBases[2], "include", "c++", Ver);
642     CppIncludeBases.emplace_back(GccLibDir);
643     llvm::sys::path::append(CppIncludeBases[3], "include", "c++");
644     CppIncludeBases.emplace_back(GccLibDir);
645     llvm::sys::path::append(CppIncludeBases[4], "include",
646                             "g++-v" + GccVer.Text);
647     CppIncludeBases.emplace_back(GccLibDir);
648     llvm::sys::path::append(CppIncludeBases[5], "include",
649                             "g++-v" + GccVer.MajorStr + "." + GccVer.MinorStr);
650     CppIncludeBases.emplace_back(GccLibDir);
651     llvm::sys::path::append(CppIncludeBases[6], "include",
652                             "g++-v" + GccVer.MajorStr);
653     for (auto &CppIncludeBase : CppIncludeBases) {
654       addSystemInclude(DriverArgs, CC1Args, CppIncludeBase);
655       CppIncludeBase += Slash;
656       addSystemInclude(DriverArgs, CC1Args, CppIncludeBase + SubdirName);
657       addSystemInclude(DriverArgs, CC1Args, CppIncludeBase + "backward");
658     }
659     break;
660   }
661 }
662 
663 static bool testTriple(const Driver &D, const llvm::Triple &Triple,
664                        const ArgList &Args) {
665   // If an explicit sysroot is set, that will be used and we shouldn't try to
666   // detect anything else.
667   std::string SubdirName;
668   if (D.SysRoot.size())
669     return true;
670   if (llvm::ErrorOr<std::string> TargetSubdir =
671           findClangRelativeSysroot(D, Triple, SubdirName))
672     return true;
673   if (llvm::ErrorOr<std::string> GPPName = findGcc(Triple))
674     return true;
675   // If we neither found a colocated sysroot or a matching gcc executable,
676   // conclude that we can't know if this is the correct spelling of the triple.
677   return false;
678 }
679 
680 static llvm::Triple adjustTriple(const Driver &D, const llvm::Triple &Triple,
681                                  const ArgList &Args) {
682   // First test if the original triple can find a sysroot with the triple
683   // name.
684   if (testTriple(D, Triple, Args))
685     return Triple;
686   llvm::SmallVector<llvm::StringRef, 3> Archs;
687   // If not, test a couple other possible arch names that might be what was
688   // intended.
689   if (Triple.getArch() == llvm::Triple::x86) {
690     Archs.emplace_back("i386");
691     Archs.emplace_back("i586");
692     Archs.emplace_back("i686");
693   } else if (Triple.getArch() == llvm::Triple::arm ||
694              Triple.getArch() == llvm::Triple::thumb) {
695     Archs.emplace_back("armv7");
696   }
697   for (auto A : Archs) {
698     llvm::Triple TestTriple(Triple);
699     TestTriple.setArchName(A);
700     if (testTriple(D, TestTriple, Args))
701       return TestTriple;
702   }
703   // If none was found, just proceed with the original value.
704   return Triple;
705 }
706 
707 void toolchains::MinGW::fixTripleArch(const Driver &D, llvm::Triple &Triple,
708                                       const ArgList &Args) {
709   if (Triple.getArch() == llvm::Triple::x86 ||
710       Triple.getArch() == llvm::Triple::arm ||
711       Triple.getArch() == llvm::Triple::thumb)
712     Triple = adjustTriple(D, Triple, Args);
713 }
714