clang  10.0.0svn
MSVC.cpp
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1 //===-- MSVC.cpp - MSVC ToolChain Implementations -------------------------===//
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 "MSVC.h"
10 #include "CommonArgs.h"
11 #include "Darwin.h"
12 #include "clang/Basic/CharInfo.h"
13 #include "clang/Basic/Version.h"
15 #include "clang/Driver/Driver.h"
17 #include "clang/Driver/Options.h"
19 #include "llvm/ADT/StringExtras.h"
20 #include "llvm/ADT/StringSwitch.h"
21 #include "llvm/Option/Arg.h"
22 #include "llvm/Option/ArgList.h"
23 #include "llvm/Support/ConvertUTF.h"
24 #include "llvm/Support/ErrorHandling.h"
25 #include "llvm/Support/FileSystem.h"
26 #include "llvm/Support/Host.h"
27 #include "llvm/Support/MemoryBuffer.h"
28 #include "llvm/Support/Path.h"
29 #include "llvm/Support/Process.h"
30 #include <cstdio>
31 
32 #ifdef _WIN32
33  #define WIN32_LEAN_AND_MEAN
34  #define NOGDI
35  #ifndef NOMINMAX
36  #define NOMINMAX
37  #endif
38  #include <windows.h>
39 #endif
40 
41 #ifdef _MSC_VER
42 // Don't support SetupApi on MinGW.
43 #define USE_MSVC_SETUP_API
44 
45 // Make sure this comes before MSVCSetupApi.h
46 #include <comdef.h>
47 
48 #include "MSVCSetupApi.h"
49 #include "llvm/Support/COM.h"
50 _COM_SMARTPTR_TYPEDEF(ISetupConfiguration, __uuidof(ISetupConfiguration));
51 _COM_SMARTPTR_TYPEDEF(ISetupConfiguration2, __uuidof(ISetupConfiguration2));
52 _COM_SMARTPTR_TYPEDEF(ISetupHelper, __uuidof(ISetupHelper));
53 _COM_SMARTPTR_TYPEDEF(IEnumSetupInstances, __uuidof(IEnumSetupInstances));
54 _COM_SMARTPTR_TYPEDEF(ISetupInstance, __uuidof(ISetupInstance));
55 _COM_SMARTPTR_TYPEDEF(ISetupInstance2, __uuidof(ISetupInstance2));
56 #endif
57 
58 using namespace clang::driver;
59 using namespace clang::driver::toolchains;
60 using namespace clang::driver::tools;
61 using namespace clang;
62 using namespace llvm::opt;
63 
64 // Defined below.
65 // Forward declare this so there aren't too many things above the constructor.
66 static bool getSystemRegistryString(const char *keyPath, const char *valueName,
67  std::string &value, std::string *phValue);
68 
69 // Check various environment variables to try and find a toolchain.
70 static bool findVCToolChainViaEnvironment(std::string &Path,
71  MSVCToolChain::ToolsetLayout &VSLayout) {
72  // These variables are typically set by vcvarsall.bat
73  // when launching a developer command prompt.
74  if (llvm::Optional<std::string> VCToolsInstallDir =
75  llvm::sys::Process::GetEnv("VCToolsInstallDir")) {
76  // This is only set by newer Visual Studios, and it leads straight to
77  // the toolchain directory.
78  Path = std::move(*VCToolsInstallDir);
80  return true;
81  }
82  if (llvm::Optional<std::string> VCInstallDir =
83  llvm::sys::Process::GetEnv("VCINSTALLDIR")) {
84  // If the previous variable isn't set but this one is, then we've found
85  // an older Visual Studio. This variable is set by newer Visual Studios too,
86  // so this check has to appear second.
87  // In older Visual Studios, the VC directory is the toolchain.
88  Path = std::move(*VCInstallDir);
90  return true;
91  }
92 
93  // We couldn't find any VC environment variables. Let's walk through PATH and
94  // see if it leads us to a VC toolchain bin directory. If it does, pick the
95  // first one that we find.
96  if (llvm::Optional<std::string> PathEnv =
97  llvm::sys::Process::GetEnv("PATH")) {
99  llvm::StringRef(*PathEnv).split(PathEntries, llvm::sys::EnvPathSeparator);
100  for (llvm::StringRef PathEntry : PathEntries) {
101  if (PathEntry.empty())
102  continue;
103 
104  llvm::SmallString<256> ExeTestPath;
105 
106  // If cl.exe doesn't exist, then this definitely isn't a VC toolchain.
107  ExeTestPath = PathEntry;
108  llvm::sys::path::append(ExeTestPath, "cl.exe");
109  if (!llvm::sys::fs::exists(ExeTestPath))
110  continue;
111 
112  // cl.exe existing isn't a conclusive test for a VC toolchain; clang also
113  // has a cl.exe. So let's check for link.exe too.
114  ExeTestPath = PathEntry;
115  llvm::sys::path::append(ExeTestPath, "link.exe");
116  if (!llvm::sys::fs::exists(ExeTestPath))
117  continue;
118 
119  // whatever/VC/bin --> old toolchain, VC dir is toolchain dir.
120  llvm::StringRef TestPath = PathEntry;
121  bool IsBin = llvm::sys::path::filename(TestPath).equals_lower("bin");
122  if (!IsBin) {
123  // Strip any architecture subdir like "amd64".
124  TestPath = llvm::sys::path::parent_path(TestPath);
125  IsBin = llvm::sys::path::filename(TestPath).equals_lower("bin");
126  }
127  if (IsBin) {
128  llvm::StringRef ParentPath = llvm::sys::path::parent_path(TestPath);
129  llvm::StringRef ParentFilename = llvm::sys::path::filename(ParentPath);
130  if (ParentFilename == "VC") {
131  Path = ParentPath;
133  return true;
134  }
135  if (ParentFilename == "x86ret" || ParentFilename == "x86chk"
136  || ParentFilename == "amd64ret" || ParentFilename == "amd64chk") {
137  Path = ParentPath;
139  return true;
140  }
141 
142  } else {
143  // This could be a new (>=VS2017) toolchain. If it is, we should find
144  // path components with these prefixes when walking backwards through
145  // the path.
146  // Note: empty strings match anything.
147  llvm::StringRef ExpectedPrefixes[] = {"", "Host", "bin", "",
148  "MSVC", "Tools", "VC"};
149 
150  auto It = llvm::sys::path::rbegin(PathEntry);
151  auto End = llvm::sys::path::rend(PathEntry);
152  for (llvm::StringRef Prefix : ExpectedPrefixes) {
153  if (It == End)
154  goto NotAToolChain;
155  if (!It->startswith(Prefix))
156  goto NotAToolChain;
157  ++It;
158  }
159 
160  // We've found a new toolchain!
161  // Back up 3 times (/bin/Host/arch) to get the root path.
162  llvm::StringRef ToolChainPath(PathEntry);
163  for (int i = 0; i < 3; ++i)
164  ToolChainPath = llvm::sys::path::parent_path(ToolChainPath);
165 
166  Path = ToolChainPath;
168  return true;
169  }
170 
171  NotAToolChain:
172  continue;
173  }
174  }
175  return false;
176 }
177 
178 // Query the Setup Config server for installs, then pick the newest version
179 // and find its default VC toolchain.
180 // This is the preferred way to discover new Visual Studios, as they're no
181 // longer listed in the registry.
182 static bool findVCToolChainViaSetupConfig(std::string &Path,
183  MSVCToolChain::ToolsetLayout &VSLayout) {
184 #if !defined(USE_MSVC_SETUP_API)
185  return false;
186 #else
187  // FIXME: This really should be done once in the top-level program's main
188  // function, as it may have already been initialized with a different
189  // threading model otherwise.
190  llvm::sys::InitializeCOMRAII COM(llvm::sys::COMThreadingMode::SingleThreaded);
191  HRESULT HR;
192 
193  // _com_ptr_t will throw a _com_error if a COM calls fail.
194  // The LLVM coding standards forbid exception handling, so we'll have to
195  // stop them from being thrown in the first place.
196  // The destructor will put the regular error handler back when we leave
197  // this scope.
198  struct SuppressCOMErrorsRAII {
199  static void __stdcall handler(HRESULT hr, IErrorInfo *perrinfo) {}
200 
201  SuppressCOMErrorsRAII() { _set_com_error_handler(handler); }
202 
203  ~SuppressCOMErrorsRAII() { _set_com_error_handler(_com_raise_error); }
204 
205  } COMErrorSuppressor;
206 
207  ISetupConfigurationPtr Query;
208  HR = Query.CreateInstance(__uuidof(SetupConfiguration));
209  if (FAILED(HR))
210  return false;
211 
212  IEnumSetupInstancesPtr EnumInstances;
213  HR = ISetupConfiguration2Ptr(Query)->EnumAllInstances(&EnumInstances);
214  if (FAILED(HR))
215  return false;
216 
217  ISetupInstancePtr Instance;
218  HR = EnumInstances->Next(1, &Instance, nullptr);
219  if (HR != S_OK)
220  return false;
221 
222  ISetupInstancePtr NewestInstance;
223  Optional<uint64_t> NewestVersionNum;
224  do {
225  bstr_t VersionString;
226  uint64_t VersionNum;
227  HR = Instance->GetInstallationVersion(VersionString.GetAddress());
228  if (FAILED(HR))
229  continue;
230  HR = ISetupHelperPtr(Query)->ParseVersion(VersionString, &VersionNum);
231  if (FAILED(HR))
232  continue;
233  if (!NewestVersionNum || (VersionNum > NewestVersionNum)) {
234  NewestInstance = Instance;
235  NewestVersionNum = VersionNum;
236  }
237  } while ((HR = EnumInstances->Next(1, &Instance, nullptr)) == S_OK);
238 
239  if (!NewestInstance)
240  return false;
241 
242  bstr_t VCPathWide;
243  HR = NewestInstance->ResolvePath(L"VC", VCPathWide.GetAddress());
244  if (FAILED(HR))
245  return false;
246 
247  std::string VCRootPath;
248  llvm::convertWideToUTF8(std::wstring(VCPathWide), VCRootPath);
249 
250  llvm::SmallString<256> ToolsVersionFilePath(VCRootPath);
251  llvm::sys::path::append(ToolsVersionFilePath, "Auxiliary", "Build",
252  "Microsoft.VCToolsVersion.default.txt");
253 
254  auto ToolsVersionFile = llvm::MemoryBuffer::getFile(ToolsVersionFilePath);
255  if (!ToolsVersionFile)
256  return false;
257 
258  llvm::SmallString<256> ToolchainPath(VCRootPath);
259  llvm::sys::path::append(ToolchainPath, "Tools", "MSVC",
260  ToolsVersionFile->get()->getBuffer().rtrim());
261  if (!llvm::sys::fs::is_directory(ToolchainPath))
262  return false;
263 
264  Path = ToolchainPath.str();
266  return true;
267 #endif
268 }
269 
270 // Look in the registry for Visual Studio installs, and use that to get
271 // a toolchain path. VS2017 and newer don't get added to the registry.
272 // So if we find something here, we know that it's an older version.
273 static bool findVCToolChainViaRegistry(std::string &Path,
274  MSVCToolChain::ToolsetLayout &VSLayout) {
275  std::string VSInstallPath;
276  if (getSystemRegistryString(R"(SOFTWARE\Microsoft\VisualStudio\$VERSION)",
277  "InstallDir", VSInstallPath, nullptr) ||
278  getSystemRegistryString(R"(SOFTWARE\Microsoft\VCExpress\$VERSION)",
279  "InstallDir", VSInstallPath, nullptr)) {
280  if (!VSInstallPath.empty()) {
281  llvm::SmallString<256> VCPath(llvm::StringRef(
282  VSInstallPath.c_str(), VSInstallPath.find(R"(\Common7\IDE)")));
283  llvm::sys::path::append(VCPath, "VC");
284 
285  Path = VCPath.str();
287  return true;
288  }
289  }
290  return false;
291 }
292 
293 // Try to find Exe from a Visual Studio distribution. This first tries to find
294 // an installed copy of Visual Studio and, failing that, looks in the PATH,
295 // making sure that whatever executable that's found is not a same-named exe
296 // from clang itself to prevent clang from falling back to itself.
297 static std::string FindVisualStudioExecutable(const ToolChain &TC,
298  const char *Exe) {
299  const auto &MSVC = static_cast<const toolchains::MSVCToolChain &>(TC);
300  SmallString<128> FilePath(MSVC.getSubDirectoryPath(
302  llvm::sys::path::append(FilePath, Exe);
303  return llvm::sys::fs::can_execute(FilePath) ? FilePath.str() : Exe;
304 }
305 
306 void visualstudio::Linker::ConstructJob(Compilation &C, const JobAction &JA,
307  const InputInfo &Output,
308  const InputInfoList &Inputs,
309  const ArgList &Args,
310  const char *LinkingOutput) const {
311  ArgStringList CmdArgs;
312 
313  auto &TC = static_cast<const toolchains::MSVCToolChain &>(getToolChain());
314 
315  assert((Output.isFilename() || Output.isNothing()) && "invalid output");
316  if (Output.isFilename())
317  CmdArgs.push_back(
318  Args.MakeArgString(std::string("-out:") + Output.getFilename()));
319 
320  if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles) &&
321  !C.getDriver().IsCLMode())
322  CmdArgs.push_back("-defaultlib:libcmt");
323 
324  if (!llvm::sys::Process::GetEnv("LIB")) {
325  // If the VC environment hasn't been configured (perhaps because the user
326  // did not run vcvarsall), try to build a consistent link environment. If
327  // the environment variable is set however, assume the user knows what
328  // they're doing.
329  CmdArgs.push_back(Args.MakeArgString(
330  Twine("-libpath:") +
331  TC.getSubDirectoryPath(
333 
334  CmdArgs.push_back(Args.MakeArgString(
335  Twine("-libpath:") +
337  "atlmfc")));
338 
339  if (TC.useUniversalCRT()) {
340  std::string UniversalCRTLibPath;
341  if (TC.getUniversalCRTLibraryPath(UniversalCRTLibPath))
342  CmdArgs.push_back(
343  Args.MakeArgString(Twine("-libpath:") + UniversalCRTLibPath));
344  }
345 
346  std::string WindowsSdkLibPath;
347  if (TC.getWindowsSDKLibraryPath(WindowsSdkLibPath))
348  CmdArgs.push_back(
349  Args.MakeArgString(std::string("-libpath:") + WindowsSdkLibPath));
350  }
351 
352  if (!C.getDriver().IsCLMode() && Args.hasArg(options::OPT_L))
353  for (const auto &LibPath : Args.getAllArgValues(options::OPT_L))
354  CmdArgs.push_back(Args.MakeArgString("-libpath:" + LibPath));
355 
356  CmdArgs.push_back("-nologo");
357 
358  if (Args.hasArg(options::OPT_g_Group, options::OPT__SLASH_Z7,
359  options::OPT__SLASH_Zd))
360  CmdArgs.push_back("-debug");
361 
362  // Pass on /Brepro if it was passed to the compiler.
363  // Note that /Brepro maps to -mno-incremental-linker-compatible.
364  bool DefaultIncrementalLinkerCompatible =
365  C.getDefaultToolChain().getTriple().isWindowsMSVCEnvironment();
366  if (!Args.hasFlag(options::OPT_mincremental_linker_compatible,
367  options::OPT_mno_incremental_linker_compatible,
368  DefaultIncrementalLinkerCompatible))
369  CmdArgs.push_back("-Brepro");
370 
371  bool DLL = Args.hasArg(options::OPT__SLASH_LD, options::OPT__SLASH_LDd,
372  options::OPT_shared);
373  if (DLL) {
374  CmdArgs.push_back(Args.MakeArgString("-dll"));
375 
376  SmallString<128> ImplibName(Output.getFilename());
377  llvm::sys::path::replace_extension(ImplibName, "lib");
378  CmdArgs.push_back(Args.MakeArgString(std::string("-implib:") + ImplibName));
379  }
380 
381  if (TC.getSanitizerArgs().needsFuzzer()) {
382  if (!Args.hasArg(options::OPT_shared))
383  CmdArgs.push_back(
384  Args.MakeArgString(std::string("-wholearchive:") +
385  TC.getCompilerRTArgString(Args, "fuzzer")));
386  CmdArgs.push_back(Args.MakeArgString("-debug"));
387  // Prevent the linker from padding sections we use for instrumentation
388  // arrays.
389  CmdArgs.push_back(Args.MakeArgString("-incremental:no"));
390  }
391 
392  if (TC.getSanitizerArgs().needsAsanRt()) {
393  CmdArgs.push_back(Args.MakeArgString("-debug"));
394  CmdArgs.push_back(Args.MakeArgString("-incremental:no"));
395  if (TC.getSanitizerArgs().needsSharedRt() ||
396  Args.hasArg(options::OPT__SLASH_MD, options::OPT__SLASH_MDd)) {
397  for (const auto &Lib : {"asan_dynamic", "asan_dynamic_runtime_thunk"})
398  CmdArgs.push_back(TC.getCompilerRTArgString(Args, Lib));
399  // Make sure the dynamic runtime thunk is not optimized out at link time
400  // to ensure proper SEH handling.
401  CmdArgs.push_back(Args.MakeArgString(
402  TC.getArch() == llvm::Triple::x86
403  ? "-include:___asan_seh_interceptor"
404  : "-include:__asan_seh_interceptor"));
405  // Make sure the linker consider all object files from the dynamic runtime
406  // thunk.
407  CmdArgs.push_back(Args.MakeArgString(std::string("-wholearchive:") +
408  TC.getCompilerRT(Args, "asan_dynamic_runtime_thunk")));
409  } else if (DLL) {
410  CmdArgs.push_back(TC.getCompilerRTArgString(Args, "asan_dll_thunk"));
411  } else {
412  for (const auto &Lib : {"asan", "asan_cxx"}) {
413  CmdArgs.push_back(TC.getCompilerRTArgString(Args, Lib));
414  // Make sure the linker consider all object files from the static lib.
415  // This is necessary because instrumented dlls need access to all the
416  // interface exported by the static lib in the main executable.
417  CmdArgs.push_back(Args.MakeArgString(std::string("-wholearchive:") +
418  TC.getCompilerRT(Args, Lib)));
419  }
420  }
421  }
422 
423  Args.AddAllArgValues(CmdArgs, options::OPT__SLASH_link);
424 
425  if (Args.hasFlag(options::OPT_fopenmp, options::OPT_fopenmp_EQ,
426  options::OPT_fno_openmp, false)) {
427  CmdArgs.push_back("-nodefaultlib:vcomp.lib");
428  CmdArgs.push_back("-nodefaultlib:vcompd.lib");
429  CmdArgs.push_back(Args.MakeArgString(std::string("-libpath:") +
430  TC.getDriver().Dir + "/../lib"));
431  switch (TC.getDriver().getOpenMPRuntime(Args)) {
432  case Driver::OMPRT_OMP:
433  CmdArgs.push_back("-defaultlib:libomp.lib");
434  break;
435  case Driver::OMPRT_IOMP5:
436  CmdArgs.push_back("-defaultlib:libiomp5md.lib");
437  break;
438  case Driver::OMPRT_GOMP:
439  break;
441  // Already diagnosed.
442  break;
443  }
444  }
445 
446  // Add compiler-rt lib in case if it was explicitly
447  // specified as an argument for --rtlib option.
448  if (!Args.hasArg(options::OPT_nostdlib)) {
449  AddRunTimeLibs(TC, TC.getDriver(), CmdArgs, Args);
450  }
451 
452  // Add filenames, libraries, and other linker inputs.
453  for (const auto &Input : Inputs) {
454  if (Input.isFilename()) {
455  CmdArgs.push_back(Input.getFilename());
456  continue;
457  }
458 
459  const Arg &A = Input.getInputArg();
460 
461  // Render -l options differently for the MSVC linker.
462  if (A.getOption().matches(options::OPT_l)) {
463  StringRef Lib = A.getValue();
464  const char *LinkLibArg;
465  if (Lib.endswith(".lib"))
466  LinkLibArg = Args.MakeArgString(Lib);
467  else
468  LinkLibArg = Args.MakeArgString(Lib + ".lib");
469  CmdArgs.push_back(LinkLibArg);
470  continue;
471  }
472 
473  // Otherwise, this is some other kind of linker input option like -Wl, -z,
474  // or -L. Render it, even if MSVC doesn't understand it.
475  A.renderAsInput(Args, CmdArgs);
476  }
477 
478  TC.addProfileRTLibs(Args, CmdArgs);
479 
480  std::vector<const char *> Environment;
481 
482  // We need to special case some linker paths. In the case of lld, we need to
483  // translate 'lld' into 'lld-link', and in the case of the regular msvc
484  // linker, we need to use a special search algorithm.
485  llvm::SmallString<128> linkPath;
486  StringRef Linker = Args.getLastArgValue(options::OPT_fuse_ld_EQ, "link");
487  if (Linker.equals_lower("lld"))
488  Linker = "lld-link";
489 
490  if (Linker.equals_lower("link")) {
491  // If we're using the MSVC linker, it's not sufficient to just use link
492  // from the program PATH, because other environments like GnuWin32 install
493  // their own link.exe which may come first.
494  linkPath = FindVisualStudioExecutable(TC, "link.exe");
495 
496  if (!TC.FoundMSVCInstall() && !llvm::sys::fs::can_execute(linkPath)) {
497  llvm::SmallString<128> ClPath;
498  ClPath = TC.GetProgramPath("cl.exe");
499  if (llvm::sys::fs::can_execute(ClPath)) {
500  linkPath = llvm::sys::path::parent_path(ClPath);
501  llvm::sys::path::append(linkPath, "link.exe");
502  if (!llvm::sys::fs::can_execute(linkPath))
503  C.getDriver().Diag(clang::diag::warn_drv_msvc_not_found);
504  } else {
505  C.getDriver().Diag(clang::diag::warn_drv_msvc_not_found);
506  }
507  }
508 
509 #ifdef _WIN32
510  // When cross-compiling with VS2017 or newer, link.exe expects to have
511  // its containing bin directory at the top of PATH, followed by the
512  // native target bin directory.
513  // e.g. when compiling for x86 on an x64 host, PATH should start with:
514  // /bin/Hostx64/x86;/bin/Hostx64/x64
515  // This doesn't attempt to handle ToolsetLayout::DevDivInternal.
516  if (TC.getIsVS2017OrNewer() &&
517  llvm::Triple(llvm::sys::getProcessTriple()).getArch() != TC.getArch()) {
518  auto HostArch = llvm::Triple(llvm::sys::getProcessTriple()).getArch();
519 
520  auto EnvBlockWide =
521  std::unique_ptr<wchar_t[], decltype(&FreeEnvironmentStringsW)>(
522  GetEnvironmentStringsW(), FreeEnvironmentStringsW);
523  if (!EnvBlockWide)
524  goto SkipSettingEnvironment;
525 
526  size_t EnvCount = 0;
527  size_t EnvBlockLen = 0;
528  while (EnvBlockWide[EnvBlockLen] != L'\0') {
529  ++EnvCount;
530  EnvBlockLen += std::wcslen(&EnvBlockWide[EnvBlockLen]) +
531  1 /*string null-terminator*/;
532  }
533  ++EnvBlockLen; // add the block null-terminator
534 
535  std::string EnvBlock;
536  if (!llvm::convertUTF16ToUTF8String(
537  llvm::ArrayRef<char>(reinterpret_cast<char *>(EnvBlockWide.get()),
538  EnvBlockLen * sizeof(EnvBlockWide[0])),
539  EnvBlock))
540  goto SkipSettingEnvironment;
541 
542  Environment.reserve(EnvCount);
543 
544  // Now loop over each string in the block and copy them into the
545  // environment vector, adjusting the PATH variable as needed when we
546  // find it.
547  for (const char *Cursor = EnvBlock.data(); *Cursor != '\0';) {
548  llvm::StringRef EnvVar(Cursor);
549  if (EnvVar.startswith_lower("path=")) {
550  using SubDirectoryType = toolchains::MSVCToolChain::SubDirectoryType;
551  constexpr size_t PrefixLen = 5; // strlen("path=")
552  Environment.push_back(Args.MakeArgString(
553  EnvVar.substr(0, PrefixLen) +
554  TC.getSubDirectoryPath(SubDirectoryType::Bin) +
555  llvm::Twine(llvm::sys::EnvPathSeparator) +
556  TC.getSubDirectoryPath(SubDirectoryType::Bin, "", HostArch) +
557  (EnvVar.size() > PrefixLen
558  ? llvm::Twine(llvm::sys::EnvPathSeparator) +
559  EnvVar.substr(PrefixLen)
560  : "")));
561  } else {
562  Environment.push_back(Args.MakeArgString(EnvVar));
563  }
564  Cursor += EnvVar.size() + 1 /*null-terminator*/;
565  }
566  }
567  SkipSettingEnvironment:;
568 #endif
569  } else {
570  linkPath = TC.GetProgramPath(Linker.str().c_str());
571  }
572 
573  auto LinkCmd = std::make_unique<Command>(
574  JA, *this, Args.MakeArgString(linkPath), CmdArgs, Inputs);
575  if (!Environment.empty())
576  LinkCmd->setEnvironment(Environment);
577  C.addCommand(std::move(LinkCmd));
578 }
579 
580 void visualstudio::Compiler::ConstructJob(Compilation &C, const JobAction &JA,
581  const InputInfo &Output,
582  const InputInfoList &Inputs,
583  const ArgList &Args,
584  const char *LinkingOutput) const {
585  C.addCommand(GetCommand(C, JA, Output, Inputs, Args, LinkingOutput));
586 }
587 
588 std::unique_ptr<Command> visualstudio::Compiler::GetCommand(
589  Compilation &C, const JobAction &JA, const InputInfo &Output,
590  const InputInfoList &Inputs, const ArgList &Args,
591  const char *LinkingOutput) const {
592  ArgStringList CmdArgs;
593  CmdArgs.push_back("/nologo");
594  CmdArgs.push_back("/c"); // Compile only.
595  CmdArgs.push_back("/W0"); // No warnings.
596 
597  // The goal is to be able to invoke this tool correctly based on
598  // any flag accepted by clang-cl.
599 
600  // These are spelled the same way in clang and cl.exe,.
601  Args.AddAllArgs(CmdArgs, {options::OPT_D, options::OPT_U, options::OPT_I});
602 
603  // Optimization level.
604  if (Arg *A = Args.getLastArg(options::OPT_fbuiltin, options::OPT_fno_builtin))
605  CmdArgs.push_back(A->getOption().getID() == options::OPT_fbuiltin ? "/Oi"
606  : "/Oi-");
607  if (Arg *A = Args.getLastArg(options::OPT_O, options::OPT_O0)) {
608  if (A->getOption().getID() == options::OPT_O0) {
609  CmdArgs.push_back("/Od");
610  } else {
611  CmdArgs.push_back("/Og");
612 
613  StringRef OptLevel = A->getValue();
614  if (OptLevel == "s" || OptLevel == "z")
615  CmdArgs.push_back("/Os");
616  else
617  CmdArgs.push_back("/Ot");
618 
619  CmdArgs.push_back("/Ob2");
620  }
621  }
622  if (Arg *A = Args.getLastArg(options::OPT_fomit_frame_pointer,
623  options::OPT_fno_omit_frame_pointer))
624  CmdArgs.push_back(A->getOption().getID() == options::OPT_fomit_frame_pointer
625  ? "/Oy"
626  : "/Oy-");
627  if (!Args.hasArg(options::OPT_fwritable_strings))
628  CmdArgs.push_back("/GF");
629 
630  // Flags for which clang-cl has an alias.
631  // FIXME: How can we ensure this stays in sync with relevant clang-cl options?
632 
633  if (Args.hasFlag(options::OPT__SLASH_GR_, options::OPT__SLASH_GR,
634  /*Default=*/false))
635  CmdArgs.push_back("/GR-");
636 
637  if (Args.hasFlag(options::OPT__SLASH_GS_, options::OPT__SLASH_GS,
638  /*Default=*/false))
639  CmdArgs.push_back("/GS-");
640 
641  if (Arg *A = Args.getLastArg(options::OPT_ffunction_sections,
642  options::OPT_fno_function_sections))
643  CmdArgs.push_back(A->getOption().getID() == options::OPT_ffunction_sections
644  ? "/Gy"
645  : "/Gy-");
646  if (Arg *A = Args.getLastArg(options::OPT_fdata_sections,
647  options::OPT_fno_data_sections))
648  CmdArgs.push_back(
649  A->getOption().getID() == options::OPT_fdata_sections ? "/Gw" : "/Gw-");
650  if (Args.hasArg(options::OPT_fsyntax_only))
651  CmdArgs.push_back("/Zs");
652  if (Args.hasArg(options::OPT_g_Flag, options::OPT_gline_tables_only,
653  options::OPT__SLASH_Z7))
654  CmdArgs.push_back("/Z7");
655 
656  std::vector<std::string> Includes =
657  Args.getAllArgValues(options::OPT_include);
658  for (const auto &Include : Includes)
659  CmdArgs.push_back(Args.MakeArgString(std::string("/FI") + Include));
660 
661  // Flags that can simply be passed through.
662  Args.AddAllArgs(CmdArgs, options::OPT__SLASH_LD);
663  Args.AddAllArgs(CmdArgs, options::OPT__SLASH_LDd);
664  Args.AddAllArgs(CmdArgs, options::OPT__SLASH_GX);
665  Args.AddAllArgs(CmdArgs, options::OPT__SLASH_GX_);
666  Args.AddAllArgs(CmdArgs, options::OPT__SLASH_EH);
667  Args.AddAllArgs(CmdArgs, options::OPT__SLASH_Zl);
668 
669  // The order of these flags is relevant, so pick the last one.
670  if (Arg *A = Args.getLastArg(options::OPT__SLASH_MD, options::OPT__SLASH_MDd,
671  options::OPT__SLASH_MT, options::OPT__SLASH_MTd))
672  A->render(Args, CmdArgs);
673 
674  // Use MSVC's default threadsafe statics behaviour unless there was a flag.
675  if (Arg *A = Args.getLastArg(options::OPT_fthreadsafe_statics,
676  options::OPT_fno_threadsafe_statics)) {
677  CmdArgs.push_back(A->getOption().getID() == options::OPT_fthreadsafe_statics
678  ? "/Zc:threadSafeInit"
679  : "/Zc:threadSafeInit-");
680  }
681 
682  // Pass through all unknown arguments so that the fallback command can see
683  // them too.
684  Args.AddAllArgs(CmdArgs, options::OPT_UNKNOWN);
685 
686  // Input filename.
687  assert(Inputs.size() == 1);
688  const InputInfo &II = Inputs[0];
689  assert(II.getType() == types::TY_C || II.getType() == types::TY_CXX);
690  CmdArgs.push_back(II.getType() == types::TY_C ? "/Tc" : "/Tp");
691  if (II.isFilename())
692  CmdArgs.push_back(II.getFilename());
693  else
694  II.getInputArg().renderAsInput(Args, CmdArgs);
695 
696  // Output filename.
697  assert(Output.getType() == types::TY_Object);
698  const char *Fo =
699  Args.MakeArgString(std::string("/Fo") + Output.getFilename());
700  CmdArgs.push_back(Fo);
701 
702  std::string Exec = FindVisualStudioExecutable(getToolChain(), "cl.exe");
703  return std::make_unique<Command>(JA, *this, Args.MakeArgString(Exec),
704  CmdArgs, Inputs);
705 }
706 
707 MSVCToolChain::MSVCToolChain(const Driver &D, const llvm::Triple &Triple,
708  const ArgList &Args)
709  : ToolChain(D, Triple, Args), CudaInstallation(D, Triple, Args) {
710  getProgramPaths().push_back(getDriver().getInstalledDir());
711  if (getDriver().getInstalledDir() != getDriver().Dir)
712  getProgramPaths().push_back(getDriver().Dir);
713 
714  // Check the environment first, since that's probably the user telling us
715  // what they want to use.
716  // Failing that, just try to find the newest Visual Studio version we can
717  // and use its default VC toolchain.
718  findVCToolChainViaEnvironment(VCToolChainPath, VSLayout) ||
719  findVCToolChainViaSetupConfig(VCToolChainPath, VSLayout) ||
720  findVCToolChainViaRegistry(VCToolChainPath, VSLayout);
721 }
722 
724  return new tools::visualstudio::Linker(*this);
725 }
726 
728  if (getTriple().isOSBinFormatMachO())
729  return new tools::darwin::Assembler(*this);
730  getDriver().Diag(clang::diag::err_no_external_assembler);
731  return nullptr;
732 }
733 
735  return true;
736 }
737 
738 bool MSVCToolChain::IsUnwindTablesDefault(const ArgList &Args) const {
739  // Don't emit unwind tables by default for MachO targets.
740  if (getTriple().isOSBinFormatMachO())
741  return false;
742 
743  // All non-x86_32 Windows targets require unwind tables. However, LLVM
744  // doesn't know how to generate them for all targets, so only enable
745  // the ones that are actually implemented.
746  return getArch() == llvm::Triple::x86_64 ||
747  getArch() == llvm::Triple::aarch64;
748 }
749 
751  return getArch() == llvm::Triple::x86_64;
752 }
753 
755  return false;
756 }
757 
759  return getArch() == llvm::Triple::x86_64;
760 }
761 
762 void MSVCToolChain::AddCudaIncludeArgs(const ArgList &DriverArgs,
763  ArgStringList &CC1Args) const {
764  CudaInstallation.AddCudaIncludeArgs(DriverArgs, CC1Args);
765 }
766 
767 void MSVCToolChain::printVerboseInfo(raw_ostream &OS) const {
768  CudaInstallation.print(OS);
769 }
770 
771 // Windows SDKs and VC Toolchains group their contents into subdirectories based
772 // on the target architecture. This function converts an llvm::Triple::ArchType
773 // to the corresponding subdirectory name.
774 static const char *llvmArchToWindowsSDKArch(llvm::Triple::ArchType Arch) {
775  using ArchType = llvm::Triple::ArchType;
776  switch (Arch) {
777  case ArchType::x86:
778  return "x86";
779  case ArchType::x86_64:
780  return "x64";
781  case ArchType::arm:
782  return "arm";
783  case ArchType::aarch64:
784  return "arm64";
785  default:
786  return "";
787  }
788 }
789 
790 // Similar to the above function, but for Visual Studios before VS2017.
791 static const char *llvmArchToLegacyVCArch(llvm::Triple::ArchType Arch) {
792  using ArchType = llvm::Triple::ArchType;
793  switch (Arch) {
794  case ArchType::x86:
795  // x86 is default in legacy VC toolchains.
796  // e.g. x86 libs are directly in /lib as opposed to /lib/x86.
797  return "";
798  case ArchType::x86_64:
799  return "amd64";
800  case ArchType::arm:
801  return "arm";
802  case ArchType::aarch64:
803  return "arm64";
804  default:
805  return "";
806  }
807 }
808 
809 // Similar to the above function, but for DevDiv internal builds.
810 static const char *llvmArchToDevDivInternalArch(llvm::Triple::ArchType Arch) {
811  using ArchType = llvm::Triple::ArchType;
812  switch (Arch) {
813  case ArchType::x86:
814  return "i386";
815  case ArchType::x86_64:
816  return "amd64";
817  case ArchType::arm:
818  return "arm";
819  case ArchType::aarch64:
820  return "arm64";
821  default:
822  return "";
823  }
824 }
825 
826 // Get the path to a specific subdirectory in the current toolchain for
827 // a given target architecture.
828 // VS2017 changed the VC toolchain layout, so this should be used instead
829 // of hardcoding paths.
830 std::string
832  llvm::StringRef SubdirParent,
833  llvm::Triple::ArchType TargetArch) const {
834  const char *SubdirName;
835  const char *IncludeName;
836  switch (VSLayout) {
838  SubdirName = llvmArchToLegacyVCArch(TargetArch);
839  IncludeName = "include";
840  break;
842  SubdirName = llvmArchToWindowsSDKArch(TargetArch);
843  IncludeName = "include";
844  break;
846  SubdirName = llvmArchToDevDivInternalArch(TargetArch);
847  IncludeName = "inc";
848  break;
849  }
850 
851  llvm::SmallString<256> Path(VCToolChainPath);
852  if (!SubdirParent.empty())
853  llvm::sys::path::append(Path, SubdirParent);
854 
855  switch (Type) {
857  if (VSLayout == ToolsetLayout::VS2017OrNewer) {
858  const bool HostIsX64 =
859  llvm::Triple(llvm::sys::getProcessTriple()).isArch64Bit();
860  const char *const HostName = HostIsX64 ? "Hostx64" : "Hostx86";
861  llvm::sys::path::append(Path, "bin", HostName, SubdirName);
862  } else { // OlderVS or DevDivInternal
863  llvm::sys::path::append(Path, "bin", SubdirName);
864  }
865  break;
867  llvm::sys::path::append(Path, IncludeName);
868  break;
870  llvm::sys::path::append(Path, "lib", SubdirName);
871  break;
872  }
873  return Path.str();
874 }
875 
876 #ifdef _WIN32
877 static bool readFullStringValue(HKEY hkey, const char *valueName,
878  std::string &value) {
879  std::wstring WideValueName;
880  if (!llvm::ConvertUTF8toWide(valueName, WideValueName))
881  return false;
882 
883  DWORD result = 0;
884  DWORD valueSize = 0;
885  DWORD type = 0;
886  // First just query for the required size.
887  result = RegQueryValueExW(hkey, WideValueName.c_str(), NULL, &type, NULL,
888  &valueSize);
889  if (result != ERROR_SUCCESS || type != REG_SZ || !valueSize)
890  return false;
891  std::vector<BYTE> buffer(valueSize);
892  result = RegQueryValueExW(hkey, WideValueName.c_str(), NULL, NULL, &buffer[0],
893  &valueSize);
894  if (result == ERROR_SUCCESS) {
895  std::wstring WideValue(reinterpret_cast<const wchar_t *>(buffer.data()),
896  valueSize / sizeof(wchar_t));
897  if (valueSize && WideValue.back() == L'\0') {
898  WideValue.pop_back();
899  }
900  // The destination buffer must be empty as an invariant of the conversion
901  // function; but this function is sometimes called in a loop that passes in
902  // the same buffer, however. Simply clear it out so we can overwrite it.
903  value.clear();
904  return llvm::convertWideToUTF8(WideValue, value);
905  }
906  return false;
907 }
908 #endif
909 
910 /// Read registry string.
911 /// This also supports a means to look for high-versioned keys by use
912 /// of a $VERSION placeholder in the key path.
913 /// $VERSION in the key path is a placeholder for the version number,
914 /// causing the highest value path to be searched for and used.
915 /// I.e. "SOFTWARE\\Microsoft\\VisualStudio\\$VERSION".
916 /// There can be additional characters in the component. Only the numeric
917 /// characters are compared. This function only searches HKLM.
918 static bool getSystemRegistryString(const char *keyPath, const char *valueName,
919  std::string &value, std::string *phValue) {
920 #ifndef _WIN32
921  return false;
922 #else
923  HKEY hRootKey = HKEY_LOCAL_MACHINE;
924  HKEY hKey = NULL;
925  long lResult;
926  bool returnValue = false;
927 
928  const char *placeHolder = strstr(keyPath, "$VERSION");
929  std::string bestName;
930  // If we have a $VERSION placeholder, do the highest-version search.
931  if (placeHolder) {
932  const char *keyEnd = placeHolder - 1;
933  const char *nextKey = placeHolder;
934  // Find end of previous key.
935  while ((keyEnd > keyPath) && (*keyEnd != '\\'))
936  keyEnd--;
937  // Find end of key containing $VERSION.
938  while (*nextKey && (*nextKey != '\\'))
939  nextKey++;
940  size_t partialKeyLength = keyEnd - keyPath;
941  char partialKey[256];
942  if (partialKeyLength >= sizeof(partialKey))
943  partialKeyLength = sizeof(partialKey) - 1;
944  strncpy(partialKey, keyPath, partialKeyLength);
945  partialKey[partialKeyLength] = '\0';
946  HKEY hTopKey = NULL;
947  lResult = RegOpenKeyExA(hRootKey, partialKey, 0, KEY_READ | KEY_WOW64_32KEY,
948  &hTopKey);
949  if (lResult == ERROR_SUCCESS) {
950  char keyName[256];
951  double bestValue = 0.0;
952  DWORD index, size = sizeof(keyName) - 1;
953  for (index = 0; RegEnumKeyExA(hTopKey, index, keyName, &size, NULL, NULL,
954  NULL, NULL) == ERROR_SUCCESS;
955  index++) {
956  const char *sp = keyName;
957  while (*sp && !isDigit(*sp))
958  sp++;
959  if (!*sp)
960  continue;
961  const char *ep = sp + 1;
962  while (*ep && (isDigit(*ep) || (*ep == '.')))
963  ep++;
964  char numBuf[32];
965  strncpy(numBuf, sp, sizeof(numBuf) - 1);
966  numBuf[sizeof(numBuf) - 1] = '\0';
967  double dvalue = strtod(numBuf, NULL);
968  if (dvalue > bestValue) {
969  // Test that InstallDir is indeed there before keeping this index.
970  // Open the chosen key path remainder.
971  bestName = keyName;
972  // Append rest of key.
973  bestName.append(nextKey);
974  lResult = RegOpenKeyExA(hTopKey, bestName.c_str(), 0,
975  KEY_READ | KEY_WOW64_32KEY, &hKey);
976  if (lResult == ERROR_SUCCESS) {
977  if (readFullStringValue(hKey, valueName, value)) {
978  bestValue = dvalue;
979  if (phValue)
980  *phValue = bestName;
981  returnValue = true;
982  }
983  RegCloseKey(hKey);
984  }
985  }
986  size = sizeof(keyName) - 1;
987  }
988  RegCloseKey(hTopKey);
989  }
990  } else {
991  lResult =
992  RegOpenKeyExA(hRootKey, keyPath, 0, KEY_READ | KEY_WOW64_32KEY, &hKey);
993  if (lResult == ERROR_SUCCESS) {
994  if (readFullStringValue(hKey, valueName, value))
995  returnValue = true;
996  if (phValue)
997  phValue->clear();
998  RegCloseKey(hKey);
999  }
1000  }
1001  return returnValue;
1002 #endif // _WIN32
1003 }
1004 
1005 // Find the most recent version of Universal CRT or Windows 10 SDK.
1006 // vcvarsqueryregistry.bat from Visual Studio 2015 sorts entries in the include
1007 // directory by name and uses the last one of the list.
1008 // So we compare entry names lexicographically to find the greatest one.
1009 static bool getWindows10SDKVersionFromPath(const std::string &SDKPath,
1010  std::string &SDKVersion) {
1011  SDKVersion.clear();
1012 
1013  std::error_code EC;
1014  llvm::SmallString<128> IncludePath(SDKPath);
1015  llvm::sys::path::append(IncludePath, "Include");
1016  for (llvm::sys::fs::directory_iterator DirIt(IncludePath, EC), DirEnd;
1017  DirIt != DirEnd && !EC; DirIt.increment(EC)) {
1018  if (!llvm::sys::fs::is_directory(DirIt->path()))
1019  continue;
1020  StringRef CandidateName = llvm::sys::path::filename(DirIt->path());
1021  // If WDK is installed, there could be subfolders like "wdf" in the
1022  // "Include" directory.
1023  // Allow only directories which names start with "10.".
1024  if (!CandidateName.startswith("10."))
1025  continue;
1026  if (CandidateName > SDKVersion)
1027  SDKVersion = CandidateName;
1028  }
1029 
1030  return !SDKVersion.empty();
1031 }
1032 
1033 /// Get Windows SDK installation directory.
1034 static bool getWindowsSDKDir(std::string &Path, int &Major,
1035  std::string &WindowsSDKIncludeVersion,
1036  std::string &WindowsSDKLibVersion) {
1037  std::string RegistrySDKVersion;
1038  // Try the Windows registry.
1040  "SOFTWARE\\Microsoft\\Microsoft SDKs\\Windows\\$VERSION",
1041  "InstallationFolder", Path, &RegistrySDKVersion))
1042  return false;
1043  if (Path.empty() || RegistrySDKVersion.empty())
1044  return false;
1045 
1046  WindowsSDKIncludeVersion.clear();
1047  WindowsSDKLibVersion.clear();
1048  Major = 0;
1049  std::sscanf(RegistrySDKVersion.c_str(), "v%d.", &Major);
1050  if (Major <= 7)
1051  return true;
1052  if (Major == 8) {
1053  // Windows SDK 8.x installs libraries in a folder whose names depend on the
1054  // version of the OS you're targeting. By default choose the newest, which
1055  // usually corresponds to the version of the OS you've installed the SDK on.
1056  const char *Tests[] = {"winv6.3", "win8", "win7"};
1057  for (const char *Test : Tests) {
1058  llvm::SmallString<128> TestPath(Path);
1059  llvm::sys::path::append(TestPath, "Lib", Test);
1060  if (llvm::sys::fs::exists(TestPath.c_str())) {
1061  WindowsSDKLibVersion = Test;
1062  break;
1063  }
1064  }
1065  return !WindowsSDKLibVersion.empty();
1066  }
1067  if (Major == 10) {
1068  if (!getWindows10SDKVersionFromPath(Path, WindowsSDKIncludeVersion))
1069  return false;
1070  WindowsSDKLibVersion = WindowsSDKIncludeVersion;
1071  return true;
1072  }
1073  // Unsupported SDK version
1074  return false;
1075 }
1076 
1077 // Gets the library path required to link against the Windows SDK.
1078 bool MSVCToolChain::getWindowsSDKLibraryPath(std::string &path) const {
1079  std::string sdkPath;
1080  int sdkMajor = 0;
1081  std::string windowsSDKIncludeVersion;
1082  std::string windowsSDKLibVersion;
1083 
1084  path.clear();
1085  if (!getWindowsSDKDir(sdkPath, sdkMajor, windowsSDKIncludeVersion,
1086  windowsSDKLibVersion))
1087  return false;
1088 
1089  llvm::SmallString<128> libPath(sdkPath);
1090  llvm::sys::path::append(libPath, "Lib");
1091  if (sdkMajor >= 8) {
1092  llvm::sys::path::append(libPath, windowsSDKLibVersion, "um",
1094  } else {
1095  switch (getArch()) {
1096  // In Windows SDK 7.x, x86 libraries are directly in the Lib folder.
1097  case llvm::Triple::x86:
1098  break;
1099  case llvm::Triple::x86_64:
1100  llvm::sys::path::append(libPath, "x64");
1101  break;
1102  case llvm::Triple::arm:
1103  // It is not necessary to link against Windows SDK 7.x when targeting ARM.
1104  return false;
1105  default:
1106  return false;
1107  }
1108  }
1109 
1110  path = libPath.str();
1111  return true;
1112 }
1113 
1114 // Check if the Include path of a specified version of Visual Studio contains
1115 // specific header files. If not, they are probably shipped with Universal CRT.
1117  llvm::SmallString<128> TestPath(
1119  llvm::sys::path::append(TestPath, "stdlib.h");
1120  return !llvm::sys::fs::exists(TestPath);
1121 }
1122 
1123 static bool getUniversalCRTSdkDir(std::string &Path, std::string &UCRTVersion) {
1124  // vcvarsqueryregistry.bat for Visual Studio 2015 queries the registry
1125  // for the specific key "KitsRoot10". So do we.
1127  "SOFTWARE\\Microsoft\\Windows Kits\\Installed Roots", "KitsRoot10",
1128  Path, nullptr))
1129  return false;
1130 
1131  return getWindows10SDKVersionFromPath(Path, UCRTVersion);
1132 }
1133 
1134 bool MSVCToolChain::getUniversalCRTLibraryPath(std::string &Path) const {
1135  std::string UniversalCRTSdkPath;
1136  std::string UCRTVersion;
1137 
1138  Path.clear();
1139  if (!getUniversalCRTSdkDir(UniversalCRTSdkPath, UCRTVersion))
1140  return false;
1141 
1142  StringRef ArchName = llvmArchToWindowsSDKArch(getArch());
1143  if (ArchName.empty())
1144  return false;
1145 
1146  llvm::SmallString<128> LibPath(UniversalCRTSdkPath);
1147  llvm::sys::path::append(LibPath, "Lib", UCRTVersion, "ucrt", ArchName);
1148 
1149  Path = LibPath.str();
1150  return true;
1151 }
1152 
1153 static VersionTuple getMSVCVersionFromTriple(const llvm::Triple &Triple) {
1154  unsigned Major, Minor, Micro;
1155  Triple.getEnvironmentVersion(Major, Minor, Micro);
1156  if (Major || Minor || Micro)
1157  return VersionTuple(Major, Minor, Micro);
1158  return VersionTuple();
1159 }
1160 
1161 static VersionTuple getMSVCVersionFromExe(const std::string &BinDir) {
1162  VersionTuple Version;
1163 #ifdef _WIN32
1164  SmallString<128> ClExe(BinDir);
1165  llvm::sys::path::append(ClExe, "cl.exe");
1166 
1167  std::wstring ClExeWide;
1168  if (!llvm::ConvertUTF8toWide(ClExe.c_str(), ClExeWide))
1169  return Version;
1170 
1171  const DWORD VersionSize = ::GetFileVersionInfoSizeW(ClExeWide.c_str(),
1172  nullptr);
1173  if (VersionSize == 0)
1174  return Version;
1175 
1176  SmallVector<uint8_t, 4 * 1024> VersionBlock(VersionSize);
1177  if (!::GetFileVersionInfoW(ClExeWide.c_str(), 0, VersionSize,
1178  VersionBlock.data()))
1179  return Version;
1180 
1181  VS_FIXEDFILEINFO *FileInfo = nullptr;
1182  UINT FileInfoSize = 0;
1183  if (!::VerQueryValueW(VersionBlock.data(), L"\\",
1184  reinterpret_cast<LPVOID *>(&FileInfo), &FileInfoSize) ||
1185  FileInfoSize < sizeof(*FileInfo))
1186  return Version;
1187 
1188  const unsigned Major = (FileInfo->dwFileVersionMS >> 16) & 0xFFFF;
1189  const unsigned Minor = (FileInfo->dwFileVersionMS ) & 0xFFFF;
1190  const unsigned Micro = (FileInfo->dwFileVersionLS >> 16) & 0xFFFF;
1191 
1192  Version = VersionTuple(Major, Minor, Micro);
1193 #endif
1194  return Version;
1195 }
1196 
1198  const ArgList &DriverArgs, ArgStringList &CC1Args,
1199  const std::string &folder, const Twine &subfolder1, const Twine &subfolder2,
1200  const Twine &subfolder3) const {
1201  llvm::SmallString<128> path(folder);
1202  llvm::sys::path::append(path, subfolder1, subfolder2, subfolder3);
1203  addSystemInclude(DriverArgs, CC1Args, path);
1204 }
1205 
1206 void MSVCToolChain::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
1207  ArgStringList &CC1Args) const {
1208  if (DriverArgs.hasArg(options::OPT_nostdinc))
1209  return;
1210 
1211  if (!DriverArgs.hasArg(options::OPT_nobuiltininc)) {
1212  AddSystemIncludeWithSubfolder(DriverArgs, CC1Args, getDriver().ResourceDir,
1213  "include");
1214  }
1215 
1216  // Add %INCLUDE%-like directories from the -imsvc flag.
1217  for (const auto &Path : DriverArgs.getAllArgValues(options::OPT__SLASH_imsvc))
1218  addSystemInclude(DriverArgs, CC1Args, Path);
1219 
1220  if (DriverArgs.hasArg(options::OPT_nostdlibinc))
1221  return;
1222 
1223  // Honor %INCLUDE%. It should know essential search paths with vcvarsall.bat.
1224  if (llvm::Optional<std::string> cl_include_dir =
1225  llvm::sys::Process::GetEnv("INCLUDE")) {
1227  StringRef(*cl_include_dir)
1228  .split(Dirs, ";", /*MaxSplit=*/-1, /*KeepEmpty=*/false);
1229  for (StringRef Dir : Dirs)
1230  addSystemInclude(DriverArgs, CC1Args, Dir);
1231  if (!Dirs.empty())
1232  return;
1233  }
1234 
1235  // When built with access to the proper Windows APIs, try to actually find
1236  // the correct include paths first.
1237  if (!VCToolChainPath.empty()) {
1238  addSystemInclude(DriverArgs, CC1Args,
1240  addSystemInclude(DriverArgs, CC1Args,
1242 
1243  if (useUniversalCRT()) {
1244  std::string UniversalCRTSdkPath;
1245  std::string UCRTVersion;
1246  if (getUniversalCRTSdkDir(UniversalCRTSdkPath, UCRTVersion)) {
1247  AddSystemIncludeWithSubfolder(DriverArgs, CC1Args, UniversalCRTSdkPath,
1248  "Include", UCRTVersion, "ucrt");
1249  }
1250  }
1251 
1252  std::string WindowsSDKDir;
1253  int major;
1254  std::string windowsSDKIncludeVersion;
1255  std::string windowsSDKLibVersion;
1256  if (getWindowsSDKDir(WindowsSDKDir, major, windowsSDKIncludeVersion,
1257  windowsSDKLibVersion)) {
1258  if (major >= 8) {
1259  // Note: windowsSDKIncludeVersion is empty for SDKs prior to v10.
1260  // Anyway, llvm::sys::path::append is able to manage it.
1261  AddSystemIncludeWithSubfolder(DriverArgs, CC1Args, WindowsSDKDir,
1262  "include", windowsSDKIncludeVersion,
1263  "shared");
1264  AddSystemIncludeWithSubfolder(DriverArgs, CC1Args, WindowsSDKDir,
1265  "include", windowsSDKIncludeVersion,
1266  "um");
1267  AddSystemIncludeWithSubfolder(DriverArgs, CC1Args, WindowsSDKDir,
1268  "include", windowsSDKIncludeVersion,
1269  "winrt");
1270  } else {
1271  AddSystemIncludeWithSubfolder(DriverArgs, CC1Args, WindowsSDKDir,
1272  "include");
1273  }
1274  }
1275 
1276  return;
1277  }
1278 
1279 #if defined(_WIN32)
1280  // As a fallback, select default install paths.
1281  // FIXME: Don't guess drives and paths like this on Windows.
1282  const StringRef Paths[] = {
1283  "C:/Program Files/Microsoft Visual Studio 10.0/VC/include",
1284  "C:/Program Files/Microsoft Visual Studio 9.0/VC/include",
1285  "C:/Program Files/Microsoft Visual Studio 9.0/VC/PlatformSDK/Include",
1286  "C:/Program Files/Microsoft Visual Studio 8/VC/include",
1287  "C:/Program Files/Microsoft Visual Studio 8/VC/PlatformSDK/Include"
1288  };
1289  addSystemIncludes(DriverArgs, CC1Args, Paths);
1290 #endif
1291 }
1292 
1293 void MSVCToolChain::AddClangCXXStdlibIncludeArgs(const ArgList &DriverArgs,
1294  ArgStringList &CC1Args) const {
1295  // FIXME: There should probably be logic here to find libc++ on Windows.
1296 }
1297 
1299  const ArgList &Args) const {
1300  bool IsWindowsMSVC = getTriple().isWindowsMSVCEnvironment();
1301  VersionTuple MSVT = ToolChain::computeMSVCVersion(D, Args);
1302  if (MSVT.empty())
1304  if (MSVT.empty() && IsWindowsMSVC)
1306  if (MSVT.empty() &&
1307  Args.hasFlag(options::OPT_fms_extensions, options::OPT_fno_ms_extensions,
1308  IsWindowsMSVC)) {
1309  // -fms-compatibility-version=19.11 is default, aka 2017, 15.3
1310  MSVT = VersionTuple(19, 11);
1311  }
1312  return MSVT;
1313 }
1314 
1315 std::string
1317  types::ID InputType) const {
1318  // The MSVC version doesn't care about the architecture, even though it
1319  // may look at the triple internally.
1320  VersionTuple MSVT = computeMSVCVersion(/*D=*/nullptr, Args);
1321  MSVT = VersionTuple(MSVT.getMajor(), MSVT.getMinor().getValueOr(0),
1322  MSVT.getSubminor().getValueOr(0));
1323 
1324  // For the rest of the triple, however, a computed architecture name may
1325  // be needed.
1326  llvm::Triple Triple(ToolChain::ComputeEffectiveClangTriple(Args, InputType));
1327  if (Triple.getEnvironment() == llvm::Triple::MSVC) {
1328  StringRef ObjFmt = Triple.getEnvironmentName().split('-').second;
1329  if (ObjFmt.empty())
1330  Triple.setEnvironmentName((Twine("msvc") + MSVT.getAsString()).str());
1331  else
1332  Triple.setEnvironmentName(
1333  (Twine("msvc") + MSVT.getAsString() + Twine('-') + ObjFmt).str());
1334  }
1335  return Triple.getTriple();
1336 }
1337 
1340  Res |= SanitizerKind::Address;
1341  Res |= SanitizerKind::PointerCompare;
1342  Res |= SanitizerKind::PointerSubtract;
1343  Res |= SanitizerKind::Fuzzer;
1344  Res |= SanitizerKind::FuzzerNoLink;
1345  Res &= ~SanitizerKind::CFIMFCall;
1346  return Res;
1347 }
1348 
1349 static void TranslateOptArg(Arg *A, llvm::opt::DerivedArgList &DAL,
1350  bool SupportsForcingFramePointer,
1351  const char *ExpandChar, const OptTable &Opts) {
1352  assert(A->getOption().matches(options::OPT__SLASH_O));
1353 
1354  StringRef OptStr = A->getValue();
1355  for (size_t I = 0, E = OptStr.size(); I != E; ++I) {
1356  const char &OptChar = *(OptStr.data() + I);
1357  switch (OptChar) {
1358  default:
1359  break;
1360  case '1':
1361  case '2':
1362  case 'x':
1363  case 'd':
1364  // Ignore /O[12xd] flags that aren't the last one on the command line.
1365  // Only the last one gets expanded.
1366  if (&OptChar != ExpandChar) {
1367  A->claim();
1368  break;
1369  }
1370  if (OptChar == 'd') {
1371  DAL.AddFlagArg(A, Opts.getOption(options::OPT_O0));
1372  } else {
1373  if (OptChar == '1') {
1374  DAL.AddJoinedArg(A, Opts.getOption(options::OPT_O), "s");
1375  } else if (OptChar == '2' || OptChar == 'x') {
1376  DAL.AddFlagArg(A, Opts.getOption(options::OPT_fbuiltin));
1377  DAL.AddJoinedArg(A, Opts.getOption(options::OPT_O), "2");
1378  }
1379  if (SupportsForcingFramePointer &&
1380  !DAL.hasArgNoClaim(options::OPT_fno_omit_frame_pointer))
1381  DAL.AddFlagArg(A, Opts.getOption(options::OPT_fomit_frame_pointer));
1382  if (OptChar == '1' || OptChar == '2')
1383  DAL.AddFlagArg(A, Opts.getOption(options::OPT_ffunction_sections));
1384  }
1385  break;
1386  case 'b':
1387  if (I + 1 != E && isdigit(OptStr[I + 1])) {
1388  switch (OptStr[I + 1]) {
1389  case '0':
1390  DAL.AddFlagArg(A, Opts.getOption(options::OPT_fno_inline));
1391  break;
1392  case '1':
1393  DAL.AddFlagArg(A, Opts.getOption(options::OPT_finline_hint_functions));
1394  break;
1395  case '2':
1396  DAL.AddFlagArg(A, Opts.getOption(options::OPT_finline_functions));
1397  break;
1398  }
1399  ++I;
1400  }
1401  break;
1402  case 'g':
1403  A->claim();
1404  break;
1405  case 'i':
1406  if (I + 1 != E && OptStr[I + 1] == '-') {
1407  ++I;
1408  DAL.AddFlagArg(A, Opts.getOption(options::OPT_fno_builtin));
1409  } else {
1410  DAL.AddFlagArg(A, Opts.getOption(options::OPT_fbuiltin));
1411  }
1412  break;
1413  case 's':
1414  DAL.AddJoinedArg(A, Opts.getOption(options::OPT_O), "s");
1415  break;
1416  case 't':
1417  DAL.AddJoinedArg(A, Opts.getOption(options::OPT_O), "2");
1418  break;
1419  case 'y': {
1420  bool OmitFramePointer = true;
1421  if (I + 1 != E && OptStr[I + 1] == '-') {
1422  OmitFramePointer = false;
1423  ++I;
1424  }
1425  if (SupportsForcingFramePointer) {
1426  if (OmitFramePointer)
1427  DAL.AddFlagArg(A,
1428  Opts.getOption(options::OPT_fomit_frame_pointer));
1429  else
1430  DAL.AddFlagArg(
1431  A, Opts.getOption(options::OPT_fno_omit_frame_pointer));
1432  } else {
1433  // Don't warn about /Oy- in x86-64 builds (where
1434  // SupportsForcingFramePointer is false). The flag having no effect
1435  // there is a compiler-internal optimization, and people shouldn't have
1436  // to special-case their build files for x86-64 clang-cl.
1437  A->claim();
1438  }
1439  break;
1440  }
1441  }
1442  }
1443 }
1444 
1445 static void TranslateDArg(Arg *A, llvm::opt::DerivedArgList &DAL,
1446  const OptTable &Opts) {
1447  assert(A->getOption().matches(options::OPT_D));
1448 
1449  StringRef Val = A->getValue();
1450  size_t Hash = Val.find('#');
1451  if (Hash == StringRef::npos || Hash > Val.find('=')) {
1452  DAL.append(A);
1453  return;
1454  }
1455 
1456  std::string NewVal = Val;
1457  NewVal[Hash] = '=';
1458  DAL.AddJoinedArg(A, Opts.getOption(options::OPT_D), NewVal);
1459 }
1460 
1461 llvm::opt::DerivedArgList *
1462 MSVCToolChain::TranslateArgs(const llvm::opt::DerivedArgList &Args,
1463  StringRef BoundArch, Action::OffloadKind) const {
1464  DerivedArgList *DAL = new DerivedArgList(Args.getBaseArgs());
1465  const OptTable &Opts = getDriver().getOpts();
1466 
1467  // /Oy and /Oy- don't have an effect on X86-64
1468  bool SupportsForcingFramePointer = getArch() != llvm::Triple::x86_64;
1469 
1470  // The -O[12xd] flag actually expands to several flags. We must desugar the
1471  // flags so that options embedded can be negated. For example, the '-O2' flag
1472  // enables '-Oy'. Expanding '-O2' into its constituent flags allows us to
1473  // correctly handle '-O2 -Oy-' where the trailing '-Oy-' disables a single
1474  // aspect of '-O2'.
1475  //
1476  // Note that this expansion logic only applies to the *last* of '[12xd]'.
1477 
1478  // First step is to search for the character we'd like to expand.
1479  const char *ExpandChar = nullptr;
1480  for (Arg *A : Args.filtered(options::OPT__SLASH_O)) {
1481  StringRef OptStr = A->getValue();
1482  for (size_t I = 0, E = OptStr.size(); I != E; ++I) {
1483  char OptChar = OptStr[I];
1484  char PrevChar = I > 0 ? OptStr[I - 1] : '0';
1485  if (PrevChar == 'b') {
1486  // OptChar does not expand; it's an argument to the previous char.
1487  continue;
1488  }
1489  if (OptChar == '1' || OptChar == '2' || OptChar == 'x' || OptChar == 'd')
1490  ExpandChar = OptStr.data() + I;
1491  }
1492  }
1493 
1494  for (Arg *A : Args) {
1495  if (A->getOption().matches(options::OPT__SLASH_O)) {
1496  // The -O flag actually takes an amalgam of other options. For example,
1497  // '/Ogyb2' is equivalent to '/Og' '/Oy' '/Ob2'.
1498  TranslateOptArg(A, *DAL, SupportsForcingFramePointer, ExpandChar, Opts);
1499  } else if (A->getOption().matches(options::OPT_D)) {
1500  // Translate -Dfoo#bar into -Dfoo=bar.
1501  TranslateDArg(A, *DAL, Opts);
1502  } else {
1503  DAL->append(A);
1504  }
1505  }
1506 
1507  return DAL;
1508 }
struct ISetupInstance ISetupInstance
Definition: MSVCSetupApi.h:77
const internal::VariadicAllOfMatcher< Type > type
Matches Types in the clang AST.
static bool getSystemRegistryString(const char *keyPath, const char *valueName, std::string &value, std::string *phValue)
Read registry string.
Definition: MSVC.cpp:918
bool IsIntegratedAssemblerDefault() const override
IsIntegratedAssemblerDefault - Does this tool chain enable -integrated-as by default.
Definition: MSVC.cpp:734
static VersionTuple getMSVCVersionFromTriple(const llvm::Triple &Triple)
Definition: MSVC.cpp:1153
std::string getSubDirectoryPath(SubDirectoryType Type, llvm::StringRef SubdirParent, llvm::Triple::ArchType TargetArch) const
Definition: MSVC.cpp:831
static bool findVCToolChainViaRegistry(std::string &Path, MSVCToolChain::ToolsetLayout &VSLayout)
Definition: MSVC.cpp:273
static bool getWindows10SDKVersionFromPath(const std::string &SDKPath, std::string &SDKVersion)
Definition: MSVC.cpp:1009
The base class of the type hierarchy.
Definition: Type.h:1436
std::string ComputeEffectiveClangTriple(const llvm::opt::ArgList &Args, types::ID InputType) const override
ComputeEffectiveClangTriple - Return the Clang triple to use for this target, which may take into acc...
Definition: MSVC.cpp:1316
void printVerboseInfo(raw_ostream &OS) const override
Dispatch to the specific toolchain for verbose printing.
Definition: MSVC.cpp:767
void AddRunTimeLibs(const ToolChain &TC, const Driver &D, llvm::opt::ArgStringList &CmdArgs, const llvm::opt::ArgList &Args)
bool isPIEDefault() const override
Test whether this toolchain defaults to PIE.
Definition: MSVC.cpp:754
DiagnosticBuilder Diag(unsigned DiagID) const
Definition: Driver.h:108
llvm::opt::DerivedArgList * TranslateArgs(const llvm::opt::DerivedArgList &Args, StringRef BoundArch, Action::OffloadKind DeviceOffloadKind) const override
TranslateArgs - Create a new derived argument list for any argument translations this ToolChain may w...
Definition: MSVC.cpp:1462
void print(raw_ostream &OS) const
Print information about the detected CUDA installation.
Definition: Cuda.cpp:275
bool getUniversalCRTLibraryPath(std::string &path) const
Check if Universal CRT should be used if available.
Definition: MSVC.cpp:1134
const char * getFilename() const
Definition: InputInfo.h:83
void AddClangCXXStdlibIncludeArgs(const llvm::opt::ArgList &DriverArgs, llvm::opt::ArgStringList &CC1Args) const override
AddClangCXXStdlibIncludeArgs - Add the clang -cc1 level arguments to set the include paths to use for...
Definition: MSVC.cpp:1293
path_list & getProgramPaths()
Definition: ToolChain.h:238
static void TranslateOptArg(Arg *A, llvm::opt::DerivedArgList &DAL, bool SupportsForcingFramePointer, const char *ExpandChar, const OptTable &Opts)
Definition: MSVC.cpp:1349
static std::string FindVisualStudioExecutable(const ToolChain &TC, const char *Exe)
Definition: MSVC.cpp:297
VersionTuple computeMSVCVersion(const Driver *D, const llvm::opt::ArgList &Args) const override
On Windows, returns the MSVC compatibility version.
Definition: MSVC.cpp:1298
static bool findVCToolChainViaEnvironment(std::string &Path, MSVCToolChain::ToolsetLayout &VSLayout)
Definition: MSVC.cpp:70
static const char * llvmArchToLegacyVCArch(llvm::Triple::ArchType Arch)
Definition: MSVC.cpp:791
InputInfo - Wrapper for information about an input source.
Definition: InputInfo.h:22
Tool * buildLinker() const override
Definition: MSVC.cpp:723
The LLVM OpenMP runtime.
Definition: Driver.h:94
bool getWindowsSDKLibraryPath(std::string &path) const
Definition: MSVC.cpp:1078
Driver - Encapsulate logic for constructing compilation processes from a set of gcc-driver-like comma...
Definition: Driver.h:59
An unknown OpenMP runtime.
Definition: Driver.h:90
types::ID getType() const
Definition: InputInfo.h:77
bool isPICDefault() const override
Test whether this toolchain defaults to PIC.
Definition: MSVC.cpp:750
#define NULL
static void TranslateDArg(Arg *A, llvm::opt::DerivedArgList &DAL, const OptTable &Opts)
Definition: MSVC.cpp:1445
const ToolChain & getDefaultToolChain() const
Definition: Compilation.h:135
void AddCudaIncludeArgs(const llvm::opt::ArgList &DriverArgs, llvm::opt::ArgStringList &CC1Args) const override
Add arguments to use system-specific CUDA includes.
Definition: MSVC.cpp:762
SourceLocation End
virtual VersionTuple computeMSVCVersion(const Driver *D, const llvm::opt::ArgList &Args) const
On Windows, returns the MSVC compatibility version.
Definition: ToolChain.cpp:971
static void addSystemIncludes(const llvm::opt::ArgList &DriverArgs, llvm::opt::ArgStringList &CC1Args, ArrayRef< StringRef > Paths)
Utility function to add a list of system include directories to CC1.
Definition: ToolChain.cpp:831
Defines version macros and version-related utility functions for Clang.
struct IEnumSetupInstances IEnumSetupInstances
Definition: MSVCSetupApi.h:87
bool IsCLMode() const
Whether the driver should follow cl.exe like behavior.
Definition: Driver.h:181
void AddClangSystemIncludeArgs(const llvm::opt::ArgList &DriverArgs, llvm::opt::ArgStringList &CC1Args) const override
Add the clang cc1 arguments for system include paths.
Definition: MSVC.cpp:1206
struct ISetupHelper ISetupHelper
Definition: MSVCSetupApi.h:107
void addCommand(std::unique_ptr< Command > C)
Definition: Compilation.h:205
Tool * buildAssembler() const override
Definition: MSVC.cpp:727
llvm::Triple::ArchType getArch() const
Definition: ToolChain.h:213
void AddCudaIncludeArgs(const llvm::opt::ArgList &DriverArgs, llvm::opt::ArgStringList &CC1Args) const
Definition: Cuda.cpp:232
const Driver & getDriver() const
Definition: ToolChain.h:197
The legacy name for the LLVM OpenMP runtime from when it was the Intel OpenMP runtime.
Definition: Driver.h:104
static bool findVCToolChainViaSetupConfig(std::string &Path, MSVCToolChain::ToolsetLayout &VSLayout)
Definition: MSVC.cpp:182
static void addSystemInclude(const llvm::opt::ArgList &DriverArgs, llvm::opt::ArgStringList &CC1Args, const Twine &Path)
Utility function to add a system include directory to CC1 arguments.
Definition: ToolChain.cpp:801
static bool getWindowsSDKDir(std::string &Path, int &Major, std::string &WindowsSDKIncludeVersion, std::string &WindowsSDKLibVersion)
Get Windows SDK installation directory.
Definition: MSVC.cpp:1034
static bool getUniversalCRTSdkDir(std::string &Path, std::string &UCRTVersion)
Definition: MSVC.cpp:1123
Dataflow Directional Tag Classes.
struct ISetupInstance2 ISetupInstance2
Definition: MSVCSetupApi.h:82
virtual std::string ComputeEffectiveClangTriple(const llvm::opt::ArgList &Args, types::ID InputType=types::TY_INVALID) const
ComputeEffectiveClangTriple - Return the Clang triple to use for this target, which may take into acc...
Definition: ToolChain.cpp:713
Tool - Information on a specific compilation tool.
Definition: Tool.h:33
The GNU OpenMP runtime.
Definition: Driver.h:99
static VersionTuple getMSVCVersionFromExe(const std::string &BinDir)
Definition: MSVC.cpp:1161
LLVM_READONLY bool isDigit(unsigned char c)
Return true if this character is an ASCII digit: [0-9].
Definition: CharInfo.h:93
Compilation - A set of tasks to perform for a single driver invocation.
Definition: Compilation.h:45
const Driver & getDriver() const
Definition: Compilation.h:133
const llvm::Triple & getTriple() const
Definition: ToolChain.h:199
virtual SanitizerMask getSupportedSanitizers() const
Return sanitizers which are available in this toolchain.
Definition: ToolChain.cpp:923
void AddSystemIncludeWithSubfolder(const llvm::opt::ArgList &DriverArgs, llvm::opt::ArgStringList &CC1Args, const std::string &folder, const Twine &subfolder1, const Twine &subfolder2="", const Twine &subfolder3="") const
Definition: MSVC.cpp:1197
bool isNothing() const
Definition: InputInfo.h:74
struct ISetupConfiguration ISetupConfiguration
Definition: MSVCSetupApi.h:92
bool IsUnwindTablesDefault(const llvm::opt::ArgList &Args) const override
IsUnwindTablesDefault - Does this tool chain use -funwind-tables by default.
Definition: MSVC.cpp:738
MSVCToolChain(const Driver &D, const llvm::Triple &Triple, const llvm::opt::ArgList &Args)
Definition: MSVC.cpp:707
bool isFilename() const
Definition: InputInfo.h:75
const llvm::opt::OptTable & getOpts() const
Definition: Driver.h:303
static const char * llvmArchToWindowsSDKArch(llvm::Triple::ArchType Arch)
Definition: MSVC.cpp:774
static const char * llvmArchToDevDivInternalArch(llvm::Triple::ArchType Arch)
Definition: MSVC.cpp:810
struct ISetupConfiguration2 ISetupConfiguration2
Definition: MSVCSetupApi.h:97
SanitizerMask getSupportedSanitizers() const override
Return sanitizers which are available in this toolchain.
Definition: MSVC.cpp:1338
ToolChain - Access to tools for a single platform.
Definition: ToolChain.h:88
bool isPICDefaultForced() const override
Tests whether this toolchain forces its default for PIC, PIE or non-PIC.
Definition: MSVC.cpp:758