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   if (Arg *A = Args.getLastArg(options::OPT_mguard_EQ)) {
173     StringRef GuardArgs = A->getValue();
174     if (GuardArgs == "none")
175       CmdArgs.push_back("--no-guard-cf");
176     else if (GuardArgs == "cf" || GuardArgs == "cf-nochecks")
177       CmdArgs.push_back("--guard-cf");
178     else
179       D.Diag(diag::err_drv_unsupported_option_argument)
180           << A->getSpelling() << GuardArgs;
181   }
182 
183   CmdArgs.push_back("-o");
184   const char *OutputFile = Output.getFilename();
185   // GCC implicitly adds an .exe extension if it is given an output file name
186   // that lacks an extension.
187   // GCC used to do this only when the compiler itself runs on windows, but
188   // since GCC 8 it does the same when cross compiling as well.
189   if (!llvm::sys::path::has_extension(OutputFile)) {
190     CmdArgs.push_back(Args.MakeArgString(Twine(OutputFile) + ".exe"));
191     OutputFile = CmdArgs.back();
192   } else
193     CmdArgs.push_back(OutputFile);
194 
195   Args.AddAllArgs(CmdArgs, options::OPT_e);
196   // FIXME: add -N, -n flags
197   Args.AddLastArg(CmdArgs, options::OPT_r);
198   Args.AddLastArg(CmdArgs, options::OPT_s);
199   Args.AddLastArg(CmdArgs, options::OPT_t);
200   Args.AddAllArgs(CmdArgs, options::OPT_u_Group);
201   Args.AddLastArg(CmdArgs, options::OPT_Z_Flag);
202 
203   // Add asan_dynamic as the first import lib before other libs. This allows
204   // asan to be initialized as early as possible to increase its instrumentation
205   // coverage to include other user DLLs which has not been built with asan.
206   if (Sanitize.needsAsanRt() && !Args.hasArg(options::OPT_nostdlib) &&
207       !Args.hasArg(options::OPT_nodefaultlibs)) {
208     // MinGW always links against a shared MSVCRT.
209     CmdArgs.push_back(
210         TC.getCompilerRTArgString(Args, "asan_dynamic", ToolChain::FT_Shared));
211   }
212 
213   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles)) {
214     if (Args.hasArg(options::OPT_shared) || Args.hasArg(options::OPT_mdll)) {
215       CmdArgs.push_back(Args.MakeArgString(TC.GetFilePath("dllcrt2.o")));
216     } else {
217       if (Args.hasArg(options::OPT_municode))
218         CmdArgs.push_back(Args.MakeArgString(TC.GetFilePath("crt2u.o")));
219       else
220         CmdArgs.push_back(Args.MakeArgString(TC.GetFilePath("crt2.o")));
221     }
222     if (Args.hasArg(options::OPT_pg))
223       CmdArgs.push_back(Args.MakeArgString(TC.GetFilePath("gcrt2.o")));
224     CmdArgs.push_back(Args.MakeArgString(TC.GetFilePath("crtbegin.o")));
225   }
226 
227   Args.AddAllArgs(CmdArgs, options::OPT_L);
228   TC.AddFilePathLibArgs(Args, CmdArgs);
229 
230   // Add the compiler-rt library directories if they exist to help
231   // the linker find the various sanitizer, builtin, and profiling runtimes.
232   for (const auto &LibPath : TC.getLibraryPaths()) {
233     if (TC.getVFS().exists(LibPath))
234       CmdArgs.push_back(Args.MakeArgString("-L" + LibPath));
235   }
236   auto CRTPath = TC.getCompilerRTPath();
237   if (TC.getVFS().exists(CRTPath))
238     CmdArgs.push_back(Args.MakeArgString("-L" + CRTPath));
239 
240   AddLinkerInputs(TC, Inputs, Args, CmdArgs, JA);
241 
242   if (C.getDriver().IsFlangMode()) {
243     addFortranRuntimeLibraryPath(TC, Args, CmdArgs);
244     addFortranRuntimeLibs(TC, CmdArgs);
245   }
246 
247   // TODO: Add profile stuff here
248 
249   if (TC.ShouldLinkCXXStdlib(Args)) {
250     bool OnlyLibstdcxxStatic = Args.hasArg(options::OPT_static_libstdcxx) &&
251                                !Args.hasArg(options::OPT_static);
252     if (OnlyLibstdcxxStatic)
253       CmdArgs.push_back("-Bstatic");
254     TC.AddCXXStdlibLibArgs(Args, CmdArgs);
255     if (OnlyLibstdcxxStatic)
256       CmdArgs.push_back("-Bdynamic");
257   }
258 
259   bool HasWindowsApp = false;
260   for (auto Lib : Args.getAllArgValues(options::OPT_l)) {
261     if (Lib == "windowsapp") {
262       HasWindowsApp = true;
263       break;
264     }
265   }
266 
267   if (!Args.hasArg(options::OPT_nostdlib)) {
268     if (!Args.hasArg(options::OPT_nodefaultlibs)) {
269       if (Args.hasArg(options::OPT_static))
270         CmdArgs.push_back("--start-group");
271 
272       if (Args.hasArg(options::OPT_fstack_protector) ||
273           Args.hasArg(options::OPT_fstack_protector_strong) ||
274           Args.hasArg(options::OPT_fstack_protector_all)) {
275         CmdArgs.push_back("-lssp_nonshared");
276         CmdArgs.push_back("-lssp");
277       }
278 
279       if (Args.hasFlag(options::OPT_fopenmp, options::OPT_fopenmp_EQ,
280                        options::OPT_fno_openmp, false)) {
281         switch (TC.getDriver().getOpenMPRuntime(Args)) {
282         case Driver::OMPRT_OMP:
283           CmdArgs.push_back("-lomp");
284           break;
285         case Driver::OMPRT_IOMP5:
286           CmdArgs.push_back("-liomp5md");
287           break;
288         case Driver::OMPRT_GOMP:
289           CmdArgs.push_back("-lgomp");
290           break;
291         case Driver::OMPRT_Unknown:
292           // Already diagnosed.
293           break;
294         }
295       }
296 
297       AddLibGCC(Args, CmdArgs);
298 
299       if (Args.hasArg(options::OPT_pg))
300         CmdArgs.push_back("-lgmon");
301 
302       if (Args.hasArg(options::OPT_pthread))
303         CmdArgs.push_back("-lpthread");
304 
305       if (Sanitize.needsAsanRt()) {
306         // MinGW always links against a shared MSVCRT.
307         CmdArgs.push_back(TC.getCompilerRTArgString(Args, "asan_dynamic",
308                                                     ToolChain::FT_Shared));
309         CmdArgs.push_back(
310             TC.getCompilerRTArgString(Args, "asan_dynamic_runtime_thunk"));
311         CmdArgs.push_back("--require-defined");
312         CmdArgs.push_back(TC.getArch() == llvm::Triple::x86
313                               ? "___asan_seh_interceptor"
314                               : "__asan_seh_interceptor");
315         // Make sure the linker consider all object files from the dynamic
316         // runtime thunk.
317         CmdArgs.push_back("--whole-archive");
318         CmdArgs.push_back(
319             TC.getCompilerRTArgString(Args, "asan_dynamic_runtime_thunk"));
320         CmdArgs.push_back("--no-whole-archive");
321       }
322 
323       TC.addProfileRTLibs(Args, CmdArgs);
324 
325       if (!HasWindowsApp) {
326         // Add system libraries. If linking to libwindowsapp.a, that import
327         // library replaces all these and we shouldn't accidentally try to
328         // link to the normal desktop mode dlls.
329         if (Args.hasArg(options::OPT_mwindows)) {
330           CmdArgs.push_back("-lgdi32");
331           CmdArgs.push_back("-lcomdlg32");
332         }
333         CmdArgs.push_back("-ladvapi32");
334         CmdArgs.push_back("-lshell32");
335         CmdArgs.push_back("-luser32");
336         CmdArgs.push_back("-lkernel32");
337       }
338 
339       if (Args.hasArg(options::OPT_static)) {
340         CmdArgs.push_back("--end-group");
341       } else {
342         AddLibGCC(Args, CmdArgs);
343         if (!HasWindowsApp)
344           CmdArgs.push_back("-lkernel32");
345       }
346     }
347 
348     if (!Args.hasArg(options::OPT_nostartfiles)) {
349       // Add crtfastmath.o if available and fast math is enabled.
350       TC.addFastMathRuntimeIfAvailable(Args, CmdArgs);
351 
352       CmdArgs.push_back(Args.MakeArgString(TC.GetFilePath("crtend.o")));
353     }
354   }
355   const char *Exec = Args.MakeArgString(TC.GetLinkerPath());
356   C.addCommand(std::make_unique<Command>(JA, *this,
357                                          ResponseFileSupport::AtFileUTF8(),
358                                          Exec, CmdArgs, Inputs, Output));
359 }
360 
361 static bool isCrossCompiling(const llvm::Triple &T, bool RequireArchMatch) {
362   llvm::Triple HostTriple(llvm::Triple::normalize(LLVM_HOST_TRIPLE));
363   if (HostTriple.getOS() != llvm::Triple::Win32)
364     return true;
365   if (RequireArchMatch && HostTriple.getArch() != T.getArch())
366     return true;
367   return false;
368 }
369 
370 // Simplified from Generic_GCC::GCCInstallationDetector::ScanLibDirForGCCTriple.
371 static bool findGccVersion(StringRef LibDir, std::string &GccLibDir,
372                            std::string &Ver,
373                            toolchains::Generic_GCC::GCCVersion &Version) {
374   Version = toolchains::Generic_GCC::GCCVersion::Parse("0.0.0");
375   std::error_code EC;
376   for (llvm::sys::fs::directory_iterator LI(LibDir, EC), LE; !EC && LI != LE;
377        LI = LI.increment(EC)) {
378     StringRef VersionText = llvm::sys::path::filename(LI->path());
379     auto CandidateVersion =
380         toolchains::Generic_GCC::GCCVersion::Parse(VersionText);
381     if (CandidateVersion.Major == -1)
382       continue;
383     if (CandidateVersion <= Version)
384       continue;
385     Version = CandidateVersion;
386     Ver = std::string(VersionText);
387     GccLibDir = LI->path();
388   }
389   return Ver.size();
390 }
391 
392 static llvm::Triple getLiteralTriple(const Driver &D, const llvm::Triple &T) {
393   llvm::Triple LiteralTriple(D.getTargetTriple());
394   // The arch portion of the triple may be overridden by -m32/-m64.
395   LiteralTriple.setArchName(T.getArchName());
396   return LiteralTriple;
397 }
398 
399 void toolchains::MinGW::findGccLibDir(const llvm::Triple &LiteralTriple) {
400   llvm::SmallVector<llvm::SmallString<32>, 5> SubdirNames;
401   SubdirNames.emplace_back(LiteralTriple.str());
402   SubdirNames.emplace_back(getTriple().str());
403   SubdirNames.emplace_back(getTriple().getArchName());
404   SubdirNames.back() += "-w64-mingw32";
405   SubdirNames.emplace_back(getTriple().getArchName());
406   SubdirNames.back() += "-w64-mingw32ucrt";
407   SubdirNames.emplace_back("mingw32");
408   if (SubdirName.empty()) {
409     SubdirName = getTriple().getArchName();
410     SubdirName += "-w64-mingw32";
411   }
412   // lib: Arch Linux, Ubuntu, Windows
413   // lib64: openSUSE Linux
414   for (StringRef CandidateLib : {"lib", "lib64"}) {
415     for (StringRef CandidateSysroot : SubdirNames) {
416       llvm::SmallString<1024> LibDir(Base);
417       llvm::sys::path::append(LibDir, CandidateLib, "gcc", CandidateSysroot);
418       if (findGccVersion(LibDir, GccLibDir, Ver, GccVer)) {
419         SubdirName = std::string(CandidateSysroot);
420         return;
421       }
422     }
423   }
424 }
425 
426 static llvm::ErrorOr<std::string> findGcc(const llvm::Triple &LiteralTriple,
427                                           const llvm::Triple &T) {
428   llvm::SmallVector<llvm::SmallString<32>, 5> Gccs;
429   Gccs.emplace_back(LiteralTriple.str());
430   Gccs.back() += "-gcc";
431   Gccs.emplace_back(T.str());
432   Gccs.back() += "-gcc";
433   Gccs.emplace_back(T.getArchName());
434   Gccs.back() += "-w64-mingw32-gcc";
435   Gccs.emplace_back(T.getArchName());
436   Gccs.back() += "-w64-mingw32ucrt-gcc";
437   Gccs.emplace_back("mingw32-gcc");
438   // Please do not add "gcc" here
439   for (StringRef CandidateGcc : Gccs)
440     if (llvm::ErrorOr<std::string> GPPName = llvm::sys::findProgramByName(CandidateGcc))
441       return GPPName;
442   return make_error_code(std::errc::no_such_file_or_directory);
443 }
444 
445 static llvm::ErrorOr<std::string>
446 findClangRelativeSysroot(const Driver &D, const llvm::Triple &LiteralTriple,
447                          const llvm::Triple &T, std::string &SubdirName) {
448   llvm::SmallVector<llvm::SmallString<32>, 4> Subdirs;
449   Subdirs.emplace_back(LiteralTriple.str());
450   Subdirs.emplace_back(T.str());
451   Subdirs.emplace_back(T.getArchName());
452   Subdirs.back() += "-w64-mingw32";
453   Subdirs.emplace_back(T.getArchName());
454   Subdirs.back() += "-w64-mingw32ucrt";
455   StringRef ClangRoot = llvm::sys::path::parent_path(D.getInstalledDir());
456   StringRef Sep = llvm::sys::path::get_separator();
457   for (StringRef CandidateSubdir : Subdirs) {
458     if (llvm::sys::fs::is_directory(ClangRoot + Sep + CandidateSubdir)) {
459       SubdirName = std::string(CandidateSubdir);
460       return (ClangRoot + Sep + CandidateSubdir).str();
461     }
462   }
463   return make_error_code(std::errc::no_such_file_or_directory);
464 }
465 
466 toolchains::MinGW::MinGW(const Driver &D, const llvm::Triple &Triple,
467                          const ArgList &Args)
468     : ToolChain(D, Triple, Args), CudaInstallation(D, Triple, Args),
469       RocmInstallation(D, Triple, Args) {
470   getProgramPaths().push_back(getDriver().getInstalledDir());
471 
472   // The sequence for detecting a sysroot here should be kept in sync with
473   // the testTriple function below.
474   llvm::Triple LiteralTriple = getLiteralTriple(D, getTriple());
475   if (getDriver().SysRoot.size())
476     Base = getDriver().SysRoot;
477   // Look for <clang-bin>/../<triplet>; if found, use <clang-bin>/.. as the
478   // base as it could still be a base for a gcc setup with libgcc.
479   else if (llvm::ErrorOr<std::string> TargetSubdir = findClangRelativeSysroot(
480                getDriver(), LiteralTriple, getTriple(), SubdirName))
481     Base = std::string(llvm::sys::path::parent_path(TargetSubdir.get()));
482   else if (llvm::ErrorOr<std::string> GPPName =
483                findGcc(LiteralTriple, getTriple()))
484     Base = std::string(llvm::sys::path::parent_path(
485         llvm::sys::path::parent_path(GPPName.get())));
486   else
487     Base = std::string(
488         llvm::sys::path::parent_path(getDriver().getInstalledDir()));
489 
490   Base += llvm::sys::path::get_separator();
491   findGccLibDir(LiteralTriple);
492   TripleDirName = SubdirName;
493   // GccLibDir must precede Base/lib so that the
494   // correct crtbegin.o ,cetend.o would be found.
495   getFilePaths().push_back(GccLibDir);
496 
497   // openSUSE/Fedora
498   std::string CandidateSubdir = SubdirName + "/sys-root/mingw";
499   if (getDriver().getVFS().exists(Base + CandidateSubdir))
500     SubdirName = CandidateSubdir;
501 
502   getFilePaths().push_back(
503       (Base + SubdirName + llvm::sys::path::get_separator() + "lib").str());
504 
505   // Gentoo
506   getFilePaths().push_back(
507       (Base + SubdirName + llvm::sys::path::get_separator() + "mingw/lib").str());
508 
509   // Only include <base>/lib if we're not cross compiling (not even for
510   // windows->windows to a different arch), or if the sysroot has been set
511   // (where we presume the user has pointed it at an arch specific
512   // subdirectory).
513   if (!::isCrossCompiling(getTriple(), /*RequireArchMatch=*/true) ||
514       getDriver().SysRoot.size())
515     getFilePaths().push_back(Base + "lib");
516 
517   NativeLLVMSupport =
518       Args.getLastArgValue(options::OPT_fuse_ld_EQ, CLANG_DEFAULT_LINKER)
519           .equals_insensitive("lld");
520 }
521 
522 bool toolchains::MinGW::IsIntegratedAssemblerDefault() const { return true; }
523 
524 Tool *toolchains::MinGW::getTool(Action::ActionClass AC) const {
525   switch (AC) {
526   case Action::PreprocessJobClass:
527     if (!Preprocessor)
528       Preprocessor.reset(new tools::gcc::Preprocessor(*this));
529     return Preprocessor.get();
530   case Action::CompileJobClass:
531     if (!Compiler)
532       Compiler.reset(new tools::gcc::Compiler(*this));
533     return Compiler.get();
534   default:
535     return ToolChain::getTool(AC);
536   }
537 }
538 
539 Tool *toolchains::MinGW::buildAssembler() const {
540   return new tools::MinGW::Assembler(*this);
541 }
542 
543 Tool *toolchains::MinGW::buildLinker() const {
544   return new tools::MinGW::Linker(*this);
545 }
546 
547 bool toolchains::MinGW::HasNativeLLVMSupport() const {
548   return NativeLLVMSupport;
549 }
550 
551 ToolChain::UnwindTableLevel
552 toolchains::MinGW::getDefaultUnwindTableLevel(const ArgList &Args) const {
553   Arg *ExceptionArg = Args.getLastArg(options::OPT_fsjlj_exceptions,
554                                       options::OPT_fseh_exceptions,
555                                       options::OPT_fdwarf_exceptions);
556   if (ExceptionArg &&
557       ExceptionArg->getOption().matches(options::OPT_fseh_exceptions))
558     return UnwindTableLevel::Asynchronous;
559 
560   if (getArch() == llvm::Triple::x86_64 || getArch() == llvm::Triple::arm ||
561       getArch() == llvm::Triple::thumb || getArch() == llvm::Triple::aarch64)
562     return UnwindTableLevel::Asynchronous;
563   return UnwindTableLevel::None;
564 }
565 
566 bool toolchains::MinGW::isPICDefault() const {
567   return getArch() == llvm::Triple::x86_64 ||
568          getArch() == llvm::Triple::aarch64;
569 }
570 
571 bool toolchains::MinGW::isPIEDefault(const llvm::opt::ArgList &Args) const {
572   return false;
573 }
574 
575 bool toolchains::MinGW::isPICDefaultForced() const { return true; }
576 
577 llvm::ExceptionHandling
578 toolchains::MinGW::GetExceptionModel(const ArgList &Args) const {
579   if (getArch() == llvm::Triple::x86_64 || getArch() == llvm::Triple::aarch64 ||
580       getArch() == llvm::Triple::arm || getArch() == llvm::Triple::thumb)
581     return llvm::ExceptionHandling::WinEH;
582   return llvm::ExceptionHandling::DwarfCFI;
583 }
584 
585 SanitizerMask toolchains::MinGW::getSupportedSanitizers() const {
586   SanitizerMask Res = ToolChain::getSupportedSanitizers();
587   Res |= SanitizerKind::Address;
588   Res |= SanitizerKind::PointerCompare;
589   Res |= SanitizerKind::PointerSubtract;
590   Res |= SanitizerKind::Vptr;
591   return Res;
592 }
593 
594 void toolchains::MinGW::AddCudaIncludeArgs(const ArgList &DriverArgs,
595                                            ArgStringList &CC1Args) const {
596   CudaInstallation.AddCudaIncludeArgs(DriverArgs, CC1Args);
597 }
598 
599 void toolchains::MinGW::AddHIPIncludeArgs(const ArgList &DriverArgs,
600                                           ArgStringList &CC1Args) const {
601   RocmInstallation.AddHIPIncludeArgs(DriverArgs, CC1Args);
602 }
603 
604 void toolchains::MinGW::printVerboseInfo(raw_ostream &OS) const {
605   CudaInstallation.print(OS);
606   RocmInstallation.print(OS);
607 }
608 
609 // Include directories for various hosts:
610 
611 // Windows, mingw.org
612 // c:\mingw\lib\gcc\mingw32\4.8.1\include\c++
613 // c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\mingw32
614 // c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\backward
615 // c:\mingw\include
616 // c:\mingw\mingw32\include
617 
618 // Windows, mingw-w64 mingw-builds
619 // c:\mingw32\i686-w64-mingw32\include
620 // c:\mingw32\i686-w64-mingw32\include\c++
621 // c:\mingw32\i686-w64-mingw32\include\c++\i686-w64-mingw32
622 // c:\mingw32\i686-w64-mingw32\include\c++\backward
623 
624 // Windows, mingw-w64 msys2
625 // c:\msys64\mingw32\include
626 // c:\msys64\mingw32\i686-w64-mingw32\include
627 // c:\msys64\mingw32\include\c++\4.9.2
628 // c:\msys64\mingw32\include\c++\4.9.2\i686-w64-mingw32
629 // c:\msys64\mingw32\include\c++\4.9.2\backward
630 
631 // openSUSE
632 // /usr/lib64/gcc/x86_64-w64-mingw32/5.1.0/include/c++
633 // /usr/lib64/gcc/x86_64-w64-mingw32/5.1.0/include/c++/x86_64-w64-mingw32
634 // /usr/lib64/gcc/x86_64-w64-mingw32/5.1.0/include/c++/backward
635 // /usr/x86_64-w64-mingw32/sys-root/mingw/include
636 
637 // Arch Linux
638 // /usr/i686-w64-mingw32/include/c++/5.1.0
639 // /usr/i686-w64-mingw32/include/c++/5.1.0/i686-w64-mingw32
640 // /usr/i686-w64-mingw32/include/c++/5.1.0/backward
641 // /usr/i686-w64-mingw32/include
642 
643 // Ubuntu
644 // /usr/include/c++/4.8
645 // /usr/include/c++/4.8/x86_64-w64-mingw32
646 // /usr/include/c++/4.8/backward
647 // /usr/x86_64-w64-mingw32/include
648 
649 // Fedora
650 // /usr/x86_64-w64-mingw32ucrt/sys-root/mingw/include/c++/x86_64-w64-mingw32ucrt
651 // /usr/x86_64-w64-mingw32ucrt/sys-root/mingw/include/c++/backward
652 // /usr/x86_64-w64-mingw32ucrt/sys-root/mingw/include
653 // /usr/lib/gcc/x86_64-w64-mingw32ucrt/12.2.1/include-fixed
654 
655 void toolchains::MinGW::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
656                                                   ArgStringList &CC1Args) const {
657   if (DriverArgs.hasArg(options::OPT_nostdinc))
658     return;
659 
660   if (!DriverArgs.hasArg(options::OPT_nobuiltininc)) {
661     SmallString<1024> P(getDriver().ResourceDir);
662     llvm::sys::path::append(P, "include");
663     addSystemInclude(DriverArgs, CC1Args, P.str());
664   }
665 
666   if (DriverArgs.hasArg(options::OPT_nostdlibinc))
667     return;
668 
669   addSystemInclude(DriverArgs, CC1Args,
670                    Base + SubdirName + llvm::sys::path::get_separator() +
671                        "include");
672 
673   // Gentoo
674   addSystemInclude(DriverArgs, CC1Args,
675                    Base + SubdirName + llvm::sys::path::get_separator() + "usr/include");
676 
677   // Only include <base>/include if we're not cross compiling (but do allow it
678   // if we're on Windows and building for Windows on another architecture),
679   // or if the sysroot has been set (where we presume the user has pointed it
680   // at an arch specific subdirectory).
681   if (!::isCrossCompiling(getTriple(), /*RequireArchMatch=*/false) ||
682       getDriver().SysRoot.size())
683     addSystemInclude(DriverArgs, CC1Args, Base + "include");
684 }
685 
686 void toolchains::MinGW::addClangTargetOptions(
687     const llvm::opt::ArgList &DriverArgs, llvm::opt::ArgStringList &CC1Args,
688     Action::OffloadKind DeviceOffloadKind) const {
689   if (Arg *A = DriverArgs.getLastArg(options::OPT_mguard_EQ)) {
690     StringRef GuardArgs = A->getValue();
691     if (GuardArgs == "none") {
692       // Do nothing.
693     } else if (GuardArgs == "cf") {
694       // Emit CFG instrumentation and the table of address-taken functions.
695       CC1Args.push_back("-cfguard");
696     } else if (GuardArgs == "cf-nochecks") {
697       // Emit only the table of address-taken functions.
698       CC1Args.push_back("-cfguard-no-checks");
699     } else {
700       getDriver().Diag(diag::err_drv_unsupported_option_argument)
701           << A->getSpelling() << GuardArgs;
702     }
703   }
704 }
705 
706 void toolchains::MinGW::AddClangCXXStdlibIncludeArgs(
707     const ArgList &DriverArgs, ArgStringList &CC1Args) const {
708   if (DriverArgs.hasArg(options::OPT_nostdinc, options::OPT_nostdlibinc,
709                         options::OPT_nostdincxx))
710     return;
711 
712   StringRef Slash = llvm::sys::path::get_separator();
713 
714   switch (GetCXXStdlibType(DriverArgs)) {
715   case ToolChain::CST_Libcxx: {
716     std::string TargetDir = (Base + "include" + Slash + getTripleString() +
717                              Slash + "c++" + Slash + "v1")
718                                 .str();
719     if (getDriver().getVFS().exists(TargetDir))
720       addSystemInclude(DriverArgs, CC1Args, TargetDir);
721     addSystemInclude(DriverArgs, CC1Args,
722                      Base + SubdirName + Slash + "include" + Slash + "c++" +
723                          Slash + "v1");
724     addSystemInclude(DriverArgs, CC1Args,
725                      Base + "include" + Slash + "c++" + Slash + "v1");
726     break;
727   }
728 
729   case ToolChain::CST_Libstdcxx:
730     llvm::SmallVector<llvm::SmallString<1024>, 7> CppIncludeBases;
731     CppIncludeBases.emplace_back(Base);
732     llvm::sys::path::append(CppIncludeBases[0], SubdirName, "include", "c++");
733     CppIncludeBases.emplace_back(Base);
734     llvm::sys::path::append(CppIncludeBases[1], SubdirName, "include", "c++",
735                             Ver);
736     CppIncludeBases.emplace_back(Base);
737     llvm::sys::path::append(CppIncludeBases[2], "include", "c++", Ver);
738     CppIncludeBases.emplace_back(GccLibDir);
739     llvm::sys::path::append(CppIncludeBases[3], "include", "c++");
740     CppIncludeBases.emplace_back(GccLibDir);
741     llvm::sys::path::append(CppIncludeBases[4], "include",
742                             "g++-v" + GccVer.Text);
743     CppIncludeBases.emplace_back(GccLibDir);
744     llvm::sys::path::append(CppIncludeBases[5], "include",
745                             "g++-v" + GccVer.MajorStr + "." + GccVer.MinorStr);
746     CppIncludeBases.emplace_back(GccLibDir);
747     llvm::sys::path::append(CppIncludeBases[6], "include",
748                             "g++-v" + GccVer.MajorStr);
749     for (auto &CppIncludeBase : CppIncludeBases) {
750       addSystemInclude(DriverArgs, CC1Args, CppIncludeBase);
751       CppIncludeBase += Slash;
752       addSystemInclude(DriverArgs, CC1Args, CppIncludeBase + TripleDirName);
753       addSystemInclude(DriverArgs, CC1Args, CppIncludeBase + "backward");
754     }
755     break;
756   }
757 }
758 
759 static bool testTriple(const Driver &D, const llvm::Triple &Triple,
760                        const ArgList &Args) {
761   // If an explicit sysroot is set, that will be used and we shouldn't try to
762   // detect anything else.
763   std::string SubdirName;
764   if (D.SysRoot.size())
765     return true;
766   llvm::Triple LiteralTriple = getLiteralTriple(D, Triple);
767   if (llvm::ErrorOr<std::string> TargetSubdir =
768           findClangRelativeSysroot(D, LiteralTriple, Triple, SubdirName))
769     return true;
770   if (llvm::ErrorOr<std::string> GPPName = findGcc(LiteralTriple, Triple))
771     return true;
772   // If we neither found a colocated sysroot or a matching gcc executable,
773   // conclude that we can't know if this is the correct spelling of the triple.
774   return false;
775 }
776 
777 static llvm::Triple adjustTriple(const Driver &D, const llvm::Triple &Triple,
778                                  const ArgList &Args) {
779   // First test if the original triple can find a sysroot with the triple
780   // name.
781   if (testTriple(D, Triple, Args))
782     return Triple;
783   llvm::SmallVector<llvm::StringRef, 3> Archs;
784   // If not, test a couple other possible arch names that might be what was
785   // intended.
786   if (Triple.getArch() == llvm::Triple::x86) {
787     Archs.emplace_back("i386");
788     Archs.emplace_back("i586");
789     Archs.emplace_back("i686");
790   } else if (Triple.getArch() == llvm::Triple::arm ||
791              Triple.getArch() == llvm::Triple::thumb) {
792     Archs.emplace_back("armv7");
793   }
794   for (auto A : Archs) {
795     llvm::Triple TestTriple(Triple);
796     TestTriple.setArchName(A);
797     if (testTriple(D, TestTriple, Args))
798       return TestTriple;
799   }
800   // If none was found, just proceed with the original value.
801   return Triple;
802 }
803 
804 void toolchains::MinGW::fixTripleArch(const Driver &D, llvm::Triple &Triple,
805                                       const ArgList &Args) {
806   if (Triple.getArch() == llvm::Triple::x86 ||
807       Triple.getArch() == llvm::Triple::arm ||
808       Triple.getArch() == llvm::Triple::thumb)
809     Triple = adjustTriple(D, Triple, Args);
810 }
811