InitHeaderSearch.cpp revision 360784 
1//===--- InitHeaderSearch.cpp - Initialize header search paths ------------===//
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// This file implements the InitHeaderSearch class.
10//
11//===----------------------------------------------------------------------===//
12
13#include "clang/Basic/FileManager.h"
14#include "clang/Basic/LangOptions.h"
15#include "clang/Config/config.h" // C_INCLUDE_DIRS
16#include "clang/Frontend/FrontendDiagnostic.h"
17#include "clang/Frontend/Utils.h"
18#include "clang/Lex/HeaderMap.h"
19#include "clang/Lex/HeaderSearch.h"
20#include "clang/Lex/HeaderSearchOptions.h"
21#include "llvm/ADT/SmallPtrSet.h"
22#include "llvm/ADT/SmallString.h"
23#include "llvm/ADT/SmallVector.h"
24#include "llvm/ADT/StringExtras.h"
25#include "llvm/ADT/Triple.h"
26#include "llvm/ADT/Twine.h"
27#include "llvm/Support/ErrorHandling.h"
28#include "llvm/Support/Path.h"
29#include "llvm/Support/raw_ostream.h"
30
31using namespace clang;
32using namespace clang::frontend;
33
34namespace {
35
36/// InitHeaderSearch - This class makes it easier to set the search paths of
37///  a HeaderSearch object. InitHeaderSearch stores several search path lists
38///  internally, which can be sent to a HeaderSearch object in one swoop.
39class InitHeaderSearch {
40  std::vector<std::pair<IncludeDirGroup, DirectoryLookup> > IncludePath;
41  typedef std::vector<std::pair<IncludeDirGroup,
42                      DirectoryLookup> >::const_iterator path_iterator;
43  std::vector<std::pair<std::string, bool> > SystemHeaderPrefixes;
44  HeaderSearch &Headers;
45  bool Verbose;
46  std::string IncludeSysroot;
47  bool HasSysroot;
48
49public:
50
51  InitHeaderSearch(HeaderSearch &HS, bool verbose, StringRef sysroot)
52    : Headers(HS), Verbose(verbose), IncludeSysroot(sysroot),
53      HasSysroot(!(sysroot.empty() || sysroot == "/")) {
54  }
55
56  /// AddPath - Add the specified path to the specified group list, prefixing
57  /// the sysroot if used.
58  /// Returns true if the path exists, false if it was ignored.
59  bool AddPath(const Twine &Path, IncludeDirGroup Group, bool isFramework);
60
61  /// AddUnmappedPath - Add the specified path to the specified group list,
62  /// without performing any sysroot remapping.
63  /// Returns true if the path exists, false if it was ignored.
64  bool AddUnmappedPath(const Twine &Path, IncludeDirGroup Group,
65                       bool isFramework);
66
67  /// AddSystemHeaderPrefix - Add the specified prefix to the system header
68  /// prefix list.
69  void AddSystemHeaderPrefix(StringRef Prefix, bool IsSystemHeader) {
70    SystemHeaderPrefixes.emplace_back(Prefix, IsSystemHeader);
71  }
72
73  /// AddGnuCPlusPlusIncludePaths - Add the necessary paths to support a gnu
74  ///  libstdc++.
75  /// Returns true if the \p Base path was found, false if it does not exist.
76  bool AddGnuCPlusPlusIncludePaths(StringRef Base, StringRef ArchDir,
77                                   StringRef Dir32, StringRef Dir64,
78                                   const llvm::Triple &triple);
79
80  /// AddMinGWCPlusPlusIncludePaths - Add the necessary paths to support a MinGW
81  ///  libstdc++.
82  void AddMinGWCPlusPlusIncludePaths(StringRef Base,
83                                     StringRef Arch,
84                                     StringRef Version);
85
86  // AddDefaultCIncludePaths - Add paths that should always be searched.
87  void AddDefaultCIncludePaths(const llvm::Triple &triple,
88                               const HeaderSearchOptions &HSOpts);
89
90  // AddDefaultCPlusPlusIncludePaths -  Add paths that should be searched when
91  //  compiling c++.
92  void AddDefaultCPlusPlusIncludePaths(const LangOptions &LangOpts,
93                                       const llvm::Triple &triple,
94                                       const HeaderSearchOptions &HSOpts);
95
96  /// AddDefaultSystemIncludePaths - Adds the default system include paths so
97  ///  that e.g. stdio.h is found.
98  void AddDefaultIncludePaths(const LangOptions &Lang,
99                              const llvm::Triple &triple,
100                              const HeaderSearchOptions &HSOpts);
101
102  /// Realize - Merges all search path lists into one list and send it to
103  /// HeaderSearch.
104  void Realize(const LangOptions &Lang);
105};
106
107}  // end anonymous namespace.
108
109static bool CanPrefixSysroot(StringRef Path) {
110#if defined(_WIN32)
111  return !Path.empty() && llvm::sys::path::is_separator(Path[0]);
112#else
113  return llvm::sys::path::is_absolute(Path);
114#endif
115}
116
117bool InitHeaderSearch::AddPath(const Twine &Path, IncludeDirGroup Group,
118                               bool isFramework) {
119  // Add the path with sysroot prepended, if desired and this is a system header
120  // group.
121  if (HasSysroot) {
122    SmallString<256> MappedPathStorage;
123    StringRef MappedPathStr = Path.toStringRef(MappedPathStorage);
124    if (CanPrefixSysroot(MappedPathStr)) {
125      return AddUnmappedPath(IncludeSysroot + Path, Group, isFramework);
126    }
127  }
128
129  return AddUnmappedPath(Path, Group, isFramework);
130}
131
132bool InitHeaderSearch::AddUnmappedPath(const Twine &Path, IncludeDirGroup Group,
133                                       bool isFramework) {
134  assert(!Path.isTriviallyEmpty() && "can't handle empty path here");
135
136  FileManager &FM = Headers.getFileMgr();
137  SmallString<256> MappedPathStorage;
138  StringRef MappedPathStr = Path.toStringRef(MappedPathStorage);
139
140  // If use system headers while cross-compiling, emit the warning.
141  if (HasSysroot && (MappedPathStr.startswith("/usr/include") ||
142                     MappedPathStr.startswith("/usr/local/include"))) {
143    Headers.getDiags().Report(diag::warn_poison_system_directories)
144        << MappedPathStr;
145  }
146
147  // Compute the DirectoryLookup type.
148  SrcMgr::CharacteristicKind Type;
149  if (Group == Quoted || Group == Angled || Group == IndexHeaderMap) {
150    Type = SrcMgr::C_User;
151  } else if (Group == ExternCSystem) {
152    Type = SrcMgr::C_ExternCSystem;
153  } else {
154    Type = SrcMgr::C_System;
155  }
156
157  // If the directory exists, add it.
158  if (auto DE = FM.getOptionalDirectoryRef(MappedPathStr)) {
159    IncludePath.push_back(
160      std::make_pair(Group, DirectoryLookup(*DE, Type, isFramework)));
161    return true;
162  }
163
164  // Check to see if this is an apple-style headermap (which are not allowed to
165  // be frameworks).
166  if (!isFramework) {
167    if (auto FE = FM.getFile(MappedPathStr)) {
168      if (const HeaderMap *HM = Headers.CreateHeaderMap(*FE)) {
169        // It is a headermap, add it to the search path.
170        IncludePath.push_back(
171          std::make_pair(Group,
172                         DirectoryLookup(HM, Type, Group == IndexHeaderMap)));
173        return true;
174      }
175    }
176  }
177
178  if (Verbose)
179    llvm::errs() << "ignoring nonexistent directory \""
180                 << MappedPathStr << "\"\n";
181  return false;
182}
183
184bool InitHeaderSearch::AddGnuCPlusPlusIncludePaths(StringRef Base,
185                                                   StringRef ArchDir,
186                                                   StringRef Dir32,
187                                                   StringRef Dir64,
188                                                   const llvm::Triple &triple) {
189  // Add the base dir
190  bool IsBaseFound = AddPath(Base, CXXSystem, false);
191
192  // Add the multilib dirs
193  llvm::Triple::ArchType arch = triple.getArch();
194  bool is64bit = arch == llvm::Triple::ppc64 || arch == llvm::Triple::x86_64;
195  if (is64bit)
196    AddPath(Base + "/" + ArchDir + "/" + Dir64, CXXSystem, false);
197  else
198    AddPath(Base + "/" + ArchDir + "/" + Dir32, CXXSystem, false);
199
200  // Add the backward dir
201  AddPath(Base + "/backward", CXXSystem, false);
202  return IsBaseFound;
203}
204
205void InitHeaderSearch::AddMinGWCPlusPlusIncludePaths(StringRef Base,
206                                                     StringRef Arch,
207                                                     StringRef Version) {
208  AddPath(Base + "/" + Arch + "/" + Version + "/include/c++",
209          CXXSystem, false);
210  AddPath(Base + "/" + Arch + "/" + Version + "/include/c++/" + Arch,
211          CXXSystem, false);
212  AddPath(Base + "/" + Arch + "/" + Version + "/include/c++/backward",
213          CXXSystem, false);
214}
215
216void InitHeaderSearch::AddDefaultCIncludePaths(const llvm::Triple &triple,
217                                            const HeaderSearchOptions &HSOpts) {
218  llvm::Triple::OSType os = triple.getOS();
219
220  if (triple.isOSDarwin()) {
221    llvm_unreachable("Include management is handled in the driver.");
222  }
223
224  if (HSOpts.UseStandardSystemIncludes) {
225    switch (os) {
226    case llvm::Triple::CloudABI:
227    case llvm::Triple::FreeBSD:
228    case llvm::Triple::NetBSD:
229    case llvm::Triple::OpenBSD:
230    case llvm::Triple::NaCl:
231    case llvm::Triple::PS4:
232    case llvm::Triple::ELFIAMCU:
233    case llvm::Triple::Fuchsia:
234      break;
235    case llvm::Triple::Win32:
236      if (triple.getEnvironment() != llvm::Triple::Cygnus)
237        break;
238      LLVM_FALLTHROUGH;
239    default:
240      // FIXME: temporary hack: hard-coded paths.
241      AddPath("/usr/local/include", System, false);
242      break;
243    }
244  }
245
246  // Builtin includes use #include_next directives and should be positioned
247  // just prior C include dirs.
248  if (HSOpts.UseBuiltinIncludes) {
249    // Ignore the sys root, we *always* look for clang headers relative to
250    // supplied path.
251    SmallString<128> P = StringRef(HSOpts.ResourceDir);
252    llvm::sys::path::append(P, "include");
253    AddUnmappedPath(P, ExternCSystem, false);
254  }
255
256  // All remaining additions are for system include directories, early exit if
257  // we aren't using them.
258  if (!HSOpts.UseStandardSystemIncludes)
259    return;
260
261  // Add dirs specified via 'configure --with-c-include-dirs'.
262  StringRef CIncludeDirs(C_INCLUDE_DIRS);
263  if (CIncludeDirs != "") {
264    SmallVector<StringRef, 5> dirs;
265    CIncludeDirs.split(dirs, ":");
266    for (StringRef dir : dirs)
267      AddPath(dir, ExternCSystem, false);
268    return;
269  }
270
271  switch (os) {
272  case llvm::Triple::Linux:
273  case llvm::Triple::Hurd:
274  case llvm::Triple::Solaris:
275    llvm_unreachable("Include management is handled in the driver.");
276
277  case llvm::Triple::CloudABI: {
278    // <sysroot>/<triple>/include
279    SmallString<128> P = StringRef(HSOpts.ResourceDir);
280    llvm::sys::path::append(P, "../../..", triple.str(), "include");
281    AddPath(P, System, false);
282    break;
283  }
284
285  case llvm::Triple::Haiku:
286    AddPath("/boot/system/non-packaged/develop/headers", System, false);
287    AddPath("/boot/system/develop/headers/os", System, false);
288    AddPath("/boot/system/develop/headers/os/app", System, false);
289    AddPath("/boot/system/develop/headers/os/arch", System, false);
290    AddPath("/boot/system/develop/headers/os/device", System, false);
291    AddPath("/boot/system/develop/headers/os/drivers", System, false);
292    AddPath("/boot/system/develop/headers/os/game", System, false);
293    AddPath("/boot/system/develop/headers/os/interface", System, false);
294    AddPath("/boot/system/develop/headers/os/kernel", System, false);
295    AddPath("/boot/system/develop/headers/os/locale", System, false);
296    AddPath("/boot/system/develop/headers/os/mail", System, false);
297    AddPath("/boot/system/develop/headers/os/media", System, false);
298    AddPath("/boot/system/develop/headers/os/midi", System, false);
299    AddPath("/boot/system/develop/headers/os/midi2", System, false);
300    AddPath("/boot/system/develop/headers/os/net", System, false);
301    AddPath("/boot/system/develop/headers/os/opengl", System, false);
302    AddPath("/boot/system/develop/headers/os/storage", System, false);
303    AddPath("/boot/system/develop/headers/os/support", System, false);
304    AddPath("/boot/system/develop/headers/os/translation", System, false);
305    AddPath("/boot/system/develop/headers/os/add-ons/graphics", System, false);
306    AddPath("/boot/system/develop/headers/os/add-ons/input_server", System, false);
307    AddPath("/boot/system/develop/headers/os/add-ons/mail_daemon", System, false);
308    AddPath("/boot/system/develop/headers/os/add-ons/registrar", System, false);
309    AddPath("/boot/system/develop/headers/os/add-ons/screen_saver", System, false);
310    AddPath("/boot/system/develop/headers/os/add-ons/tracker", System, false);
311    AddPath("/boot/system/develop/headers/os/be_apps/Deskbar", System, false);
312    AddPath("/boot/system/develop/headers/os/be_apps/NetPositive", System, false);
313    AddPath("/boot/system/develop/headers/os/be_apps/Tracker", System, false);
314    AddPath("/boot/system/develop/headers/3rdparty", System, false);
315    AddPath("/boot/system/develop/headers/bsd", System, false);
316    AddPath("/boot/system/develop/headers/glibc", System, false);
317    AddPath("/boot/system/develop/headers/posix", System, false);
318    AddPath("/boot/system/develop/headers",  System, false);
319    break;
320  case llvm::Triple::RTEMS:
321    break;
322  case llvm::Triple::Win32:
323    switch (triple.getEnvironment()) {
324    default: llvm_unreachable("Include management is handled in the driver.");
325    case llvm::Triple::Cygnus:
326      AddPath("/usr/include/w32api", System, false);
327      break;
328    case llvm::Triple::GNU:
329      break;
330    }
331    break;
332  default:
333    break;
334  }
335
336  switch (os) {
337  case llvm::Triple::CloudABI:
338  case llvm::Triple::RTEMS:
339  case llvm::Triple::NaCl:
340  case llvm::Triple::ELFIAMCU:
341  case llvm::Triple::Fuchsia:
342    break;
343  case llvm::Triple::PS4: {
344    // <isysroot> gets prepended later in AddPath().
345    std::string BaseSDKPath = "";
346    if (!HasSysroot) {
347      const char *envValue = getenv("SCE_ORBIS_SDK_DIR");
348      if (envValue)
349        BaseSDKPath = envValue;
350      else {
351        // HSOpts.ResourceDir variable contains the location of Clang's
352        // resource files.
353        // Assuming that Clang is configured for PS4 without
354        // --with-clang-resource-dir option, the location of Clang's resource
355        // files is <SDK_DIR>/host_tools/lib/clang
356        SmallString<128> P = StringRef(HSOpts.ResourceDir);
357        llvm::sys::path::append(P, "../../..");
358        BaseSDKPath = P.str();
359      }
360    }
361    AddPath(BaseSDKPath + "/target/include", System, false);
362    if (triple.isPS4CPU())
363      AddPath(BaseSDKPath + "/target/include_common", System, false);
364    LLVM_FALLTHROUGH;
365  }
366  default:
367    AddPath("/usr/include", ExternCSystem, false);
368    break;
369  }
370}
371
372void InitHeaderSearch::AddDefaultCPlusPlusIncludePaths(
373    const LangOptions &LangOpts, const llvm::Triple &triple,
374    const HeaderSearchOptions &HSOpts) {
375  llvm::Triple::OSType os = triple.getOS();
376  // FIXME: temporary hack: hard-coded paths.
377
378  if (triple.isOSDarwin()) {
379    llvm_unreachable("Include management is handled in the driver.");
380  }
381
382  switch (os) {
383  case llvm::Triple::Linux:
384  case llvm::Triple::Hurd:
385  case llvm::Triple::Solaris:
386    llvm_unreachable("Include management is handled in the driver.");
387    break;
388  case llvm::Triple::Win32:
389    switch (triple.getEnvironment()) {
390    default: llvm_unreachable("Include management is handled in the driver.");
391    case llvm::Triple::Cygnus:
392      // Cygwin-1.7
393      AddMinGWCPlusPlusIncludePaths("/usr/lib/gcc", "i686-pc-cygwin", "4.7.3");
394      AddMinGWCPlusPlusIncludePaths("/usr/lib/gcc", "i686-pc-cygwin", "4.5.3");
395      AddMinGWCPlusPlusIncludePaths("/usr/lib/gcc", "i686-pc-cygwin", "4.3.4");
396      // g++-4 / Cygwin-1.5
397      AddMinGWCPlusPlusIncludePaths("/usr/lib/gcc", "i686-pc-cygwin", "4.3.2");
398      break;
399    }
400    break;
401  case llvm::Triple::DragonFly:
402    AddPath("/usr/include/c++/5.0", CXXSystem, false);
403    break;
404  case llvm::Triple::Minix:
405    AddGnuCPlusPlusIncludePaths("/usr/gnu/include/c++/4.4.3",
406                                "", "", "", triple);
407    break;
408  default:
409    break;
410  }
411}
412
413void InitHeaderSearch::AddDefaultIncludePaths(const LangOptions &Lang,
414                                              const llvm::Triple &triple,
415                                            const HeaderSearchOptions &HSOpts) {
416  // NB: This code path is going away. All of the logic is moving into the
417  // driver which has the information necessary to do target-specific
418  // selections of default include paths. Each target which moves there will be
419  // exempted from this logic here until we can delete the entire pile of code.
420  switch (triple.getOS()) {
421  default:
422    break; // Everything else continues to use this routine's logic.
423
424  case llvm::Triple::Emscripten:
425  case llvm::Triple::Linux:
426  case llvm::Triple::Hurd:
427  case llvm::Triple::Solaris:
428  case llvm::Triple::WASI:
429    return;
430
431  case llvm::Triple::Win32:
432    if (triple.getEnvironment() != llvm::Triple::Cygnus ||
433        triple.isOSBinFormatMachO())
434      return;
435    break;
436
437  case llvm::Triple::UnknownOS:
438    if (triple.getArch() == llvm::Triple::wasm32 ||
439        triple.getArch() == llvm::Triple::wasm64)
440      return;
441    break;
442  }
443
444  // All header search logic is handled in the Driver for Darwin.
445  if (triple.isOSDarwin()) {
446    if (HSOpts.UseStandardSystemIncludes) {
447      // Add the default framework include paths on Darwin.
448      AddPath("/System/Library/Frameworks", System, true);
449      AddPath("/Library/Frameworks", System, true);
450    }
451    return;
452  }
453
454  if (Lang.CPlusPlus && !Lang.AsmPreprocessor &&
455      HSOpts.UseStandardCXXIncludes && HSOpts.UseStandardSystemIncludes) {
456    if (HSOpts.UseLibcxx) {
457      AddPath("/usr/include/c++/v1", CXXSystem, false);
458    } else {
459      AddDefaultCPlusPlusIncludePaths(Lang, triple, HSOpts);
460    }
461  }
462
463  AddDefaultCIncludePaths(triple, HSOpts);
464}
465
466/// RemoveDuplicates - If there are duplicate directory entries in the specified
467/// search list, remove the later (dead) ones.  Returns the number of non-system
468/// headers removed, which is used to update NumAngled.
469static unsigned RemoveDuplicates(std::vector<DirectoryLookup> &SearchList,
470                                 unsigned First, bool Verbose) {
471  llvm::SmallPtrSet<const DirectoryEntry *, 8> SeenDirs;
472  llvm::SmallPtrSet<const DirectoryEntry *, 8> SeenFrameworkDirs;
473  llvm::SmallPtrSet<const HeaderMap *, 8> SeenHeaderMaps;
474  unsigned NonSystemRemoved = 0;
475  for (unsigned i = First; i != SearchList.size(); ++i) {
476    unsigned DirToRemove = i;
477
478    const DirectoryLookup &CurEntry = SearchList[i];
479
480    if (CurEntry.isNormalDir()) {
481      // If this isn't the first time we've seen this dir, remove it.
482      if (SeenDirs.insert(CurEntry.getDir()).second)
483        continue;
484    } else if (CurEntry.isFramework()) {
485      // If this isn't the first time we've seen this framework dir, remove it.
486      if (SeenFrameworkDirs.insert(CurEntry.getFrameworkDir()).second)
487        continue;
488    } else {
489      assert(CurEntry.isHeaderMap() && "Not a headermap or normal dir?");
490      // If this isn't the first time we've seen this headermap, remove it.
491      if (SeenHeaderMaps.insert(CurEntry.getHeaderMap()).second)
492        continue;
493    }
494
495    // If we have a normal #include dir/framework/headermap that is shadowed
496    // later in the chain by a system include location, we actually want to
497    // ignore the user's request and drop the user dir... keeping the system
498    // dir.  This is weird, but required to emulate GCC's search path correctly.
499    //
500    // Since dupes of system dirs are rare, just rescan to find the original
501    // that we're nuking instead of using a DenseMap.
502    if (CurEntry.getDirCharacteristic() != SrcMgr::C_User) {
503      // Find the dir that this is the same of.
504      unsigned FirstDir;
505      for (FirstDir = First;; ++FirstDir) {
506        assert(FirstDir != i && "Didn't find dupe?");
507
508        const DirectoryLookup &SearchEntry = SearchList[FirstDir];
509
510        // If these are different lookup types, then they can't be the dupe.
511        if (SearchEntry.getLookupType() != CurEntry.getLookupType())
512          continue;
513
514        bool isSame;
515        if (CurEntry.isNormalDir())
516          isSame = SearchEntry.getDir() == CurEntry.getDir();
517        else if (CurEntry.isFramework())
518          isSame = SearchEntry.getFrameworkDir() == CurEntry.getFrameworkDir();
519        else {
520          assert(CurEntry.isHeaderMap() && "Not a headermap or normal dir?");
521          isSame = SearchEntry.getHeaderMap() == CurEntry.getHeaderMap();
522        }
523
524        if (isSame)
525          break;
526      }
527
528      // If the first dir in the search path is a non-system dir, zap it
529      // instead of the system one.
530      if (SearchList[FirstDir].getDirCharacteristic() == SrcMgr::C_User)
531        DirToRemove = FirstDir;
532    }
533
534    if (Verbose) {
535      llvm::errs() << "ignoring duplicate directory \""
536                   << CurEntry.getName() << "\"\n";
537      if (DirToRemove != i)
538        llvm::errs() << "  as it is a non-system directory that duplicates "
539                     << "a system directory\n";
540    }
541    if (DirToRemove != i)
542      ++NonSystemRemoved;
543
544    // This is reached if the current entry is a duplicate.  Remove the
545    // DirToRemove (usually the current dir).
546    SearchList.erase(SearchList.begin()+DirToRemove);
547    --i;
548  }
549  return NonSystemRemoved;
550}
551
552
553void InitHeaderSearch::Realize(const LangOptions &Lang) {
554  // Concatenate ANGLE+SYSTEM+AFTER chains together into SearchList.
555  std::vector<DirectoryLookup> SearchList;
556  SearchList.reserve(IncludePath.size());
557
558  // Quoted arguments go first.
559  for (auto &Include : IncludePath)
560    if (Include.first == Quoted)
561      SearchList.push_back(Include.second);
562
563  // Deduplicate and remember index.
564  RemoveDuplicates(SearchList, 0, Verbose);
565  unsigned NumQuoted = SearchList.size();
566
567  for (auto &Include : IncludePath)
568    if (Include.first == Angled || Include.first == IndexHeaderMap)
569      SearchList.push_back(Include.second);
570
571  RemoveDuplicates(SearchList, NumQuoted, Verbose);
572  unsigned NumAngled = SearchList.size();
573
574  for (auto &Include : IncludePath)
575    if (Include.first == System || Include.first == ExternCSystem ||
576        (!Lang.ObjC && !Lang.CPlusPlus && Include.first == CSystem) ||
577        (/*FIXME !Lang.ObjC && */ Lang.CPlusPlus &&
578         Include.first == CXXSystem) ||
579        (Lang.ObjC && !Lang.CPlusPlus && Include.first == ObjCSystem) ||
580        (Lang.ObjC && Lang.CPlusPlus && Include.first == ObjCXXSystem))
581      SearchList.push_back(Include.second);
582
583  for (auto &Include : IncludePath)
584    if (Include.first == After)
585      SearchList.push_back(Include.second);
586
587  // Remove duplicates across both the Angled and System directories.  GCC does
588  // this and failing to remove duplicates across these two groups breaks
589  // #include_next.
590  unsigned NonSystemRemoved = RemoveDuplicates(SearchList, NumQuoted, Verbose);
591  NumAngled -= NonSystemRemoved;
592
593  bool DontSearchCurDir = false;  // TODO: set to true if -I- is set?
594  Headers.SetSearchPaths(SearchList, NumQuoted, NumAngled, DontSearchCurDir);
595
596  Headers.SetSystemHeaderPrefixes(SystemHeaderPrefixes);
597
598  // If verbose, print the list of directories that will be searched.
599  if (Verbose) {
600    llvm::errs() << "#include \"...\" search starts here:\n";
601    for (unsigned i = 0, e = SearchList.size(); i != e; ++i) {
602      if (i == NumQuoted)
603        llvm::errs() << "#include <...> search starts here:\n";
604      StringRef Name = SearchList[i].getName();
605      const char *Suffix;
606      if (SearchList[i].isNormalDir())
607        Suffix = "";
608      else if (SearchList[i].isFramework())
609        Suffix = " (framework directory)";
610      else {
611        assert(SearchList[i].isHeaderMap() && "Unknown DirectoryLookup");
612        Suffix = " (headermap)";
613      }
614      llvm::errs() << " " << Name << Suffix << "\n";
615    }
616    llvm::errs() << "End of search list.\n";
617  }
618}
619
620void clang::ApplyHeaderSearchOptions(HeaderSearch &HS,
621                                     const HeaderSearchOptions &HSOpts,
622                                     const LangOptions &Lang,
623                                     const llvm::Triple &Triple) {
624  InitHeaderSearch Init(HS, HSOpts.Verbose, HSOpts.Sysroot);
625
626  // Add the user defined entries.
627  for (unsigned i = 0, e = HSOpts.UserEntries.size(); i != e; ++i) {
628    const HeaderSearchOptions::Entry &E = HSOpts.UserEntries[i];
629    if (E.IgnoreSysRoot) {
630      Init.AddUnmappedPath(E.Path, E.Group, E.IsFramework);
631    } else {
632      Init.AddPath(E.Path, E.Group, E.IsFramework);
633    }
634  }
635
636  Init.AddDefaultIncludePaths(Lang, Triple, HSOpts);
637
638  for (unsigned i = 0, e = HSOpts.SystemHeaderPrefixes.size(); i != e; ++i)
639    Init.AddSystemHeaderPrefix(HSOpts.SystemHeaderPrefixes[i].Prefix,
640                               HSOpts.SystemHeaderPrefixes[i].IsSystemHeader);
641
642  if (HSOpts.UseBuiltinIncludes) {
643    // Set up the builtin include directory in the module map.
644    SmallString<128> P = StringRef(HSOpts.ResourceDir);
645    llvm::sys::path::append(P, "include");
646    if (auto Dir = HS.getFileMgr().getDirectory(P))
647      HS.getModuleMap().setBuiltinIncludeDir(*Dir);
648  }
649
650  Init.Realize(Lang);
651}
652