contrib/llvm/tools/clang/lib/Frontend/InitHeaderSearch.cpp

   1 //===--- InitHeaderSearch.cpp - Initialize header search paths ------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file implements the InitHeaderSearch class.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "clang/Basic/FileManager.h"
  15 #include "clang/Basic/LangOptions.h"
  16 #include "clang/Config/config.h" // C_INCLUDE_DIRS
  17 #include "clang/Frontend/FrontendDiagnostic.h"
  18 #include "clang/Frontend/Utils.h"
  19 #include "clang/Lex/HeaderMap.h"
  20 #include "clang/Lex/HeaderSearch.h"
  21 #include "clang/Lex/HeaderSearchOptions.h"
  22 #include "llvm/ADT/SmallPtrSet.h"
  23 #include "llvm/ADT/SmallString.h"
  24 #include "llvm/ADT/SmallVector.h"
  25 #include "llvm/ADT/StringExtras.h"
  26 #include "llvm/ADT/Triple.h"
  27 #include "llvm/ADT/Twine.h"
  28 #include "llvm/Support/ErrorHandling.h"
  29 #include "llvm/Support/Path.h"
  30 #include "llvm/Support/raw_ostream.h"
  31
  32 using namespace clang;
  33 using namespace clang::frontend;
  34
  35 namespace {
  36
  37 /// InitHeaderSearch - This class makes it easier to set the search paths of
  38 ///  a HeaderSearch object. InitHeaderSearch stores several search path lists
  39 ///  internally, which can be sent to a HeaderSearch object in one swoop.
  40 class InitHeaderSearch {
  41   std::vector<std::pair<IncludeDirGroup, DirectoryLookup> > IncludePath;
  42   typedef std::vector<std::pair<IncludeDirGroup,
  43                       DirectoryLookup> >::const_iterator path_iterator;
  44   std::vector<std::pair<std::string, bool> > SystemHeaderPrefixes;
  45   HeaderSearch &Headers;
  46   bool Verbose;
  47   std::string IncludeSysroot;
  48   bool HasSysroot;
  49
  50 public:
  51
  52   InitHeaderSearch(HeaderSearch &HS, bool verbose, StringRef sysroot)
  53     : Headers(HS), Verbose(verbose), IncludeSysroot(sysroot),
  54       HasSysroot(!(sysroot.empty() || sysroot == "/")) {
  55   }
  56
  57   /// AddPath - Add the specified path to the specified group list, prefixing
  58   /// the sysroot if used.
  59   /// Returns true if the path exists, false if it was ignored.
  60   bool AddPath(const Twine &Path, IncludeDirGroup Group, bool isFramework);
  61
  62   /// AddUnmappedPath - Add the specified path to the specified group list,
  63   /// without performing any sysroot remapping.
  64   /// Returns true if the path exists, false if it was ignored.
  65   bool AddUnmappedPath(const Twine &Path, IncludeDirGroup Group,
  66                        bool isFramework);
  67
  68   /// AddSystemHeaderPrefix - Add the specified prefix to the system header
  69   /// prefix list.
  70   void AddSystemHeaderPrefix(StringRef Prefix, bool IsSystemHeader) {
  71     SystemHeaderPrefixes.emplace_back(Prefix, IsSystemHeader);
  72   }
  73
  74   /// AddGnuCPlusPlusIncludePaths - Add the necessary paths to support a gnu
  75   ///  libstdc++.
  76   /// Returns true if the \p Base path was found, false if it does not exist.
  77   bool AddGnuCPlusPlusIncludePaths(StringRef Base, StringRef ArchDir,
  78                                    StringRef Dir32, StringRef Dir64,
  79                                    const llvm::Triple &triple);
  80
  81   /// AddMinGWCPlusPlusIncludePaths - Add the necessary paths to support a MinGW
  82   ///  libstdc++.
  83   void AddMinGWCPlusPlusIncludePaths(StringRef Base,
  84                                      StringRef Arch,
  85                                      StringRef Version);
  86
  87   // AddDefaultCIncludePaths - Add paths that should always be searched.
  88   void AddDefaultCIncludePaths(const llvm::Triple &triple,
  89                                const HeaderSearchOptions &HSOpts);
  90
  91   // AddDefaultCPlusPlusIncludePaths -  Add paths that should be searched when
  92   //  compiling c++.
  93   void AddDefaultCPlusPlusIncludePaths(const LangOptions &LangOpts,
  94                                        const llvm::Triple &triple,
  95                                        const HeaderSearchOptions &HSOpts);
  96
  97   /// AddDefaultSystemIncludePaths - Adds the default system include paths so
  98   ///  that e.g. stdio.h is found.
  99   void AddDefaultIncludePaths(const LangOptions &Lang,
 100                               const llvm::Triple &triple,
 101                               const HeaderSearchOptions &HSOpts);
 102
 103   /// Realize - Merges all search path lists into one list and send it to
 104   /// HeaderSearch.
 105   void Realize(const LangOptions &Lang);
 106 };
 107
 108 }  // end anonymous namespace.
 109
 110 static bool CanPrefixSysroot(StringRef Path) {
 111 #if defined(_WIN32)
 112   return !Path.empty() && llvm::sys::path::is_separator(Path[0]);
 113 #else
 114   return llvm::sys::path::is_absolute(Path);
 115 #endif
 116 }
 117
 118 bool InitHeaderSearch::AddPath(const Twine &Path, IncludeDirGroup Group,
 119                                bool isFramework) {
 120   // Add the path with sysroot prepended, if desired and this is a system header
 121   // group.
 122   if (HasSysroot) {
 123     SmallString<256> MappedPathStorage;
 124     StringRef MappedPathStr = Path.toStringRef(MappedPathStorage);
 125     if (CanPrefixSysroot(MappedPathStr)) {
 126       return AddUnmappedPath(IncludeSysroot + Path, Group, isFramework);
 127     }
 128   }
 129
 130   return AddUnmappedPath(Path, Group, isFramework);
 131 }
 132
 133 bool InitHeaderSearch::AddUnmappedPath(const Twine &Path, IncludeDirGroup Group,
 134                                        bool isFramework) {
 135   assert(!Path.isTriviallyEmpty() && "can't handle empty path here");
 136
 137   FileManager &FM = Headers.getFileMgr();
 138   SmallString<256> MappedPathStorage;
 139   StringRef MappedPathStr = Path.toStringRef(MappedPathStorage);
 140
 141   // Compute the DirectoryLookup type.
 142   SrcMgr::CharacteristicKind Type;
 143   if (Group == Quoted || Group == Angled || Group == IndexHeaderMap) {
 144     Type = SrcMgr::C_User;
 145   } else if (Group == ExternCSystem) {
 146     Type = SrcMgr::C_ExternCSystem;
 147   } else {
 148     Type = SrcMgr::C_System;
 149   }
 150
 151   // If the directory exists, add it.
 152   if (const DirectoryEntry *DE = FM.getDirectory(MappedPathStr)) {
 153     IncludePath.push_back(
 154       std::make_pair(Group, DirectoryLookup(DE, Type, isFramework)));
 155     return true;
 156   }
 157
 158   // Check to see if this is an apple-style headermap (which are not allowed to
 159   // be frameworks).
 160   if (!isFramework) {
 161     if (const FileEntry *FE = FM.getFile(MappedPathStr)) {
 162       if (const HeaderMap *HM = Headers.CreateHeaderMap(FE)) {
 163         // It is a headermap, add it to the search path.
 164         IncludePath.push_back(
 165           std::make_pair(Group,
 166                          DirectoryLookup(HM, Type, Group == IndexHeaderMap)));
 167         return true;
 168       }
 169     }
 170   }
 171
 172   if (Verbose)
 173     llvm::errs() << "ignoring nonexistent directory \""
 174                  << MappedPathStr << "\"\n";
 175   return false;
 176 }
 177
 178 bool InitHeaderSearch::AddGnuCPlusPlusIncludePaths(StringRef Base,
 179                                                    StringRef ArchDir,
 180                                                    StringRef Dir32,
 181                                                    StringRef Dir64,
 182                                                    const llvm::Triple &triple) {
 183   // Add the base dir
 184   bool IsBaseFound = AddPath(Base, CXXSystem, false);
 185
 186   // Add the multilib dirs
 187   llvm::Triple::ArchType arch = triple.getArch();
 188   bool is64bit = arch == llvm::Triple::ppc64 || arch == llvm::Triple::x86_64;
 189   if (is64bit)
 190     AddPath(Base + "/" + ArchDir + "/" + Dir64, CXXSystem, false);
 191   else
 192     AddPath(Base + "/" + ArchDir + "/" + Dir32, CXXSystem, false);
 193
 194   // Add the backward dir
 195   AddPath(Base + "/backward", CXXSystem, false);
 196   return IsBaseFound;
 197 }
 198
 199 void InitHeaderSearch::AddMinGWCPlusPlusIncludePaths(StringRef Base,
 200                                                      StringRef Arch,
 201                                                      StringRef Version) {
 202   AddPath(Base + "/" + Arch + "/" + Version + "/include/c++",
 203           CXXSystem, false);
 204   AddPath(Base + "/" + Arch + "/" + Version + "/include/c++/" + Arch,
 205           CXXSystem, false);
 206   AddPath(Base + "/" + Arch + "/" + Version + "/include/c++/backward",
 207           CXXSystem, false);
 208 }
 209
 210 void InitHeaderSearch::AddDefaultCIncludePaths(const llvm::Triple &triple,
 211                                             const HeaderSearchOptions &HSOpts) {
 212   llvm::Triple::OSType os = triple.getOS();
 213
 214   if (HSOpts.UseStandardSystemIncludes) {
 215     switch (os) {
 216     case llvm::Triple::CloudABI:
 217     case llvm::Triple::FreeBSD:
 218     case llvm::Triple::NetBSD:
 219     case llvm::Triple::OpenBSD:
 220     case llvm::Triple::NaCl:
 221     case llvm::Triple::PS4:
 222     case llvm::Triple::ELFIAMCU:
 223     case llvm::Triple::Fuchsia:
 224       break;
 225     case llvm::Triple::Win32:
 226       if (triple.getEnvironment() != llvm::Triple::Cygnus)
 227         break;
 228       LLVM_FALLTHROUGH;
 229     default:
 230       // FIXME: temporary hack: hard-coded paths.
 231       AddPath("/usr/local/include", System, false);
 232       break;
 233     }
 234   }
 235
 236   // Builtin includes use #include_next directives and should be positioned
 237   // just prior C include dirs.
 238   if (HSOpts.UseBuiltinIncludes) {
 239     // Ignore the sys root, we *always* look for clang headers relative to
 240     // supplied path.
 241     SmallString<128> P = StringRef(HSOpts.ResourceDir);
 242     llvm::sys::path::append(P, "include");
 243     AddUnmappedPath(P, ExternCSystem, false);
 244   }
 245
 246   // All remaining additions are for system include directories, early exit if
 247   // we aren't using them.
 248   if (!HSOpts.UseStandardSystemIncludes)
 249     return;
 250
 251   // Add dirs specified via 'configure --with-c-include-dirs'.
 252   StringRef CIncludeDirs(C_INCLUDE_DIRS);
 253   if (CIncludeDirs != "") {
 254     SmallVector<StringRef, 5> dirs;
 255     CIncludeDirs.split(dirs, ":");
 256     for (StringRef dir : dirs)
 257       AddPath(dir, ExternCSystem, false);
 258     return;
 259   }
 260
 261   switch (os) {
 262   case llvm::Triple::Linux:
 263   case llvm::Triple::Hurd:
 264   case llvm::Triple::Solaris:
 265     llvm_unreachable("Include management is handled in the driver.");
 266
 267   case llvm::Triple::CloudABI: {
 268     // <sysroot>/<triple>/include
 269     SmallString<128> P = StringRef(HSOpts.ResourceDir);
 270     llvm::sys::path::append(P, "../../..", triple.str(), "include");
 271     AddPath(P, System, false);
 272     break;
 273   }
 274
 275   case llvm::Triple::Haiku:
 276     AddPath("/boot/system/non-packaged/develop/headers", System, false);
 277     AddPath("/boot/system/develop/headers/os", System, false);
 278     AddPath("/boot/system/develop/headers/os/app", System, false);
 279     AddPath("/boot/system/develop/headers/os/arch", System, false);
 280     AddPath("/boot/system/develop/headers/os/device", System, false);
 281     AddPath("/boot/system/develop/headers/os/drivers", System, false);
 282     AddPath("/boot/system/develop/headers/os/game", System, false);
 283     AddPath("/boot/system/develop/headers/os/interface", System, false);
 284     AddPath("/boot/system/develop/headers/os/kernel", System, false);
 285     AddPath("/boot/system/develop/headers/os/locale", System, false);
 286     AddPath("/boot/system/develop/headers/os/mail", System, false);
 287     AddPath("/boot/system/develop/headers/os/media", System, false);
 288     AddPath("/boot/system/develop/headers/os/midi", System, false);
 289     AddPath("/boot/system/develop/headers/os/midi2", System, false);
 290     AddPath("/boot/system/develop/headers/os/net", System, false);
 291     AddPath("/boot/system/develop/headers/os/opengl", System, false);
 292     AddPath("/boot/system/develop/headers/os/storage", System, false);
 293     AddPath("/boot/system/develop/headers/os/support", System, false);
 294     AddPath("/boot/system/develop/headers/os/translation", System, false);
 295     AddPath("/boot/system/develop/headers/os/add-ons/graphics", System, false);
 296     AddPath("/boot/system/develop/headers/os/add-ons/input_server", System, false);
 297     AddPath("/boot/system/develop/headers/os/add-ons/mail_daemon", System, false);
 298     AddPath("/boot/system/develop/headers/os/add-ons/registrar", System, false);
 299     AddPath("/boot/system/develop/headers/os/add-ons/screen_saver", System, false);
 300     AddPath("/boot/system/develop/headers/os/add-ons/tracker", System, false);
 301     AddPath("/boot/system/develop/headers/os/be_apps/Deskbar", System, false);
 302     AddPath("/boot/system/develop/headers/os/be_apps/NetPositive", System, false);
 303     AddPath("/boot/system/develop/headers/os/be_apps/Tracker", System, false);
 304     AddPath("/boot/system/develop/headers/3rdparty", System, false);
 305     AddPath("/boot/system/develop/headers/bsd", System, false);
 306     AddPath("/boot/system/develop/headers/glibc", System, false);
 307     AddPath("/boot/system/develop/headers/posix", System, false);
 308     AddPath("/boot/system/develop/headers",  System, false);
 309     break;
 310   case llvm::Triple::RTEMS:
 311     break;
 312   case llvm::Triple::Win32:
 313     switch (triple.getEnvironment()) {
 314     default: llvm_unreachable("Include management is handled in the driver.");
 315     case llvm::Triple::Cygnus:
 316       AddPath("/usr/include/w32api", System, false);
 317       break;
 318     case llvm::Triple::GNU:
 319       break;
 320     }
 321     break;
 322   default:
 323     break;
 324   }
 325
 326   switch (os) {
 327   case llvm::Triple::CloudABI:
 328   case llvm::Triple::RTEMS:
 329   case llvm::Triple::NaCl:
 330   case llvm::Triple::ELFIAMCU:
 331   case llvm::Triple::Fuchsia:
 332     break;
 333   case llvm::Triple::PS4: {
 334     // <isysroot> gets prepended later in AddPath().
 335     std::string BaseSDKPath = "";
 336     if (!HasSysroot) {
 337       const char *envValue = getenv("SCE_ORBIS_SDK_DIR");
 338       if (envValue)
 339         BaseSDKPath = envValue;
 340       else {
 341         // HSOpts.ResourceDir variable contains the location of Clang's
 342         // resource files.
 343         // Assuming that Clang is configured for PS4 without
 344         // --with-clang-resource-dir option, the location of Clang's resource
 345         // files is <SDK_DIR>/host_tools/lib/clang
 346         SmallString<128> P = StringRef(HSOpts.ResourceDir);
 347         llvm::sys::path::append(P, "../../..");
 348         BaseSDKPath = P.str();
 349       }
 350     }
 351     AddPath(BaseSDKPath + "/target/include", System, false);
 352     if (triple.isPS4CPU())
 353       AddPath(BaseSDKPath + "/target/include_common", System, false);
 354     LLVM_FALLTHROUGH;
 355   }
 356   default:
 357     AddPath("/usr/include", ExternCSystem, false);
 358     break;
 359   }
 360 }
 361
 362 void InitHeaderSearch::AddDefaultCPlusPlusIncludePaths(
 363     const LangOptions &LangOpts, const llvm::Triple &triple,
 364     const HeaderSearchOptions &HSOpts) {
 365   llvm::Triple::OSType os = triple.getOS();
 366   // FIXME: temporary hack: hard-coded paths.
 367
 368   if (triple.isOSDarwin()) {
 369     bool IsBaseFound = true;
 370     switch (triple.getArch()) {
 371     default: break;
 372
 373     case llvm::Triple::ppc:
 374     case llvm::Triple::ppc64:
 375       IsBaseFound = AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.2.1",
 376                                                 "powerpc-apple-darwin10", "",
 377                                                 "ppc64", triple);
 378       IsBaseFound |= AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.0.0",
 379                                                  "powerpc-apple-darwin10", "",
 380                                                  "ppc64", triple);
 381       break;
 382
 383     case llvm::Triple::x86:
 384     case llvm::Triple::x86_64:
 385       IsBaseFound = AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.2.1",
 386                                                 "i686-apple-darwin10", "",
 387                                                 "x86_64", triple);
 388       IsBaseFound |= AddGnuCPlusPlusIncludePaths(
 389           "/usr/include/c++/4.0.0", "i686-apple-darwin8", "", "", triple);
 390       break;
 391
 392     case llvm::Triple::arm:
 393     case llvm::Triple::thumb:
 394       IsBaseFound = AddGnuCPlusPlusIncludePaths(
 395           "/usr/include/c++/4.2.1", "arm-apple-darwin10", "v7", "", triple);
 396       IsBaseFound |= AddGnuCPlusPlusIncludePaths(
 397           "/usr/include/c++/4.2.1", "arm-apple-darwin10", "v6", "", triple);
 398       break;
 399
 400     case llvm::Triple::aarch64:
 401       IsBaseFound = AddGnuCPlusPlusIncludePaths(
 402           "/usr/include/c++/4.2.1", "arm64-apple-darwin10", "", "", triple);
 403       break;
 404     }
 405     // Warn when compiling pure C++ / Objective-C++ only.
 406     if (!IsBaseFound &&
 407         !(LangOpts.CUDA || LangOpts.OpenCL || LangOpts.RenderScript)) {
 408       Headers.getDiags().Report(SourceLocation(),
 409                                 diag::warn_stdlibcxx_not_found);
 410     }
 411     return;
 412   }
 413
 414   switch (os) {
 415   case llvm::Triple::Linux:
 416   case llvm::Triple::Hurd:
 417   case llvm::Triple::Solaris:
 418     llvm_unreachable("Include management is handled in the driver.");
 419     break;
 420   case llvm::Triple::Win32:
 421     switch (triple.getEnvironment()) {
 422     default: llvm_unreachable("Include management is handled in the driver.");
 423     case llvm::Triple::Cygnus:
 424       // Cygwin-1.7
 425       AddMinGWCPlusPlusIncludePaths("/usr/lib/gcc", "i686-pc-cygwin", "4.7.3");
 426       AddMinGWCPlusPlusIncludePaths("/usr/lib/gcc", "i686-pc-cygwin", "4.5.3");
 427       AddMinGWCPlusPlusIncludePaths("/usr/lib/gcc", "i686-pc-cygwin", "4.3.4");
 428       // g++-4 / Cygwin-1.5
 429       AddMinGWCPlusPlusIncludePaths("/usr/lib/gcc", "i686-pc-cygwin", "4.3.2");
 430       break;
 431     }
 432     break;
 433   case llvm::Triple::DragonFly:
 434     AddPath("/usr/include/c++/5.0", CXXSystem, false);
 435     break;
 436   case llvm::Triple::Minix:
 437     AddGnuCPlusPlusIncludePaths("/usr/gnu/include/c++/4.4.3",
 438                                 "", "", "", triple);
 439     break;
 440   default:
 441     break;
 442   }
 443 }
 444
 445 void InitHeaderSearch::AddDefaultIncludePaths(const LangOptions &Lang,
 446                                               const llvm::Triple &triple,
 447                                             const HeaderSearchOptions &HSOpts) {
 448   // NB: This code path is going away. All of the logic is moving into the
 449   // driver which has the information necessary to do target-specific
 450   // selections of default include paths. Each target which moves there will be
 451   // exempted from this logic here until we can delete the entire pile of code.
 452   switch (triple.getOS()) {
 453   default:
 454     break; // Everything else continues to use this routine's logic.
 455
 456   case llvm::Triple::Linux:
 457   case llvm::Triple::Hurd:
 458   case llvm::Triple::Solaris:
 459     return;
 460
 461   case llvm::Triple::Win32:
 462     if (triple.getEnvironment() != llvm::Triple::Cygnus ||
 463         triple.isOSBinFormatMachO())
 464       return;
 465     break;
 466   }
 467
 468   if (Lang.CPlusPlus && !Lang.AsmPreprocessor &&
 469       HSOpts.UseStandardCXXIncludes && HSOpts.UseStandardSystemIncludes) {
 470     if (HSOpts.UseLibcxx) {
 471       AddPath("/usr/include/c++/v1", CXXSystem, false);
 472     } else {
 473       AddDefaultCPlusPlusIncludePaths(Lang, triple, HSOpts);
 474     }
 475   }
 476
 477   AddDefaultCIncludePaths(triple, HSOpts);
 478
 479   // Add the default framework include paths on Darwin.
 480   if (HSOpts.UseStandardSystemIncludes) {
 481     if (triple.isOSDarwin()) {
 482       AddPath("/System/Library/Frameworks", System, true);
 483       AddPath("/Library/Frameworks", System, true);
 484     }
 485   }
 486 }
 487
 488 /// RemoveDuplicates - If there are duplicate directory entries in the specified
 489 /// search list, remove the later (dead) ones.  Returns the number of non-system
 490 /// headers removed, which is used to update NumAngled.
 491 static unsigned RemoveDuplicates(std::vector<DirectoryLookup> &SearchList,
 492                                  unsigned First, bool Verbose) {
 493   llvm::SmallPtrSet<const DirectoryEntry *, 8> SeenDirs;
 494   llvm::SmallPtrSet<const DirectoryEntry *, 8> SeenFrameworkDirs;
 495   llvm::SmallPtrSet<const HeaderMap *, 8> SeenHeaderMaps;
 496   unsigned NonSystemRemoved = 0;
 497   for (unsigned i = First; i != SearchList.size(); ++i) {
 498     unsigned DirToRemove = i;
 499
 500     const DirectoryLookup &CurEntry = SearchList[i];
 501
 502     if (CurEntry.isNormalDir()) {
 503       // If this isn't the first time we've seen this dir, remove it.
 504       if (SeenDirs.insert(CurEntry.getDir()).second)
 505         continue;
 506     } else if (CurEntry.isFramework()) {
 507       // If this isn't the first time we've seen this framework dir, remove it.
 508       if (SeenFrameworkDirs.insert(CurEntry.getFrameworkDir()).second)
 509         continue;
 510     } else {
 511       assert(CurEntry.isHeaderMap() && "Not a headermap or normal dir?");
 512       // If this isn't the first time we've seen this headermap, remove it.
 513       if (SeenHeaderMaps.insert(CurEntry.getHeaderMap()).second)
 514         continue;
 515     }
 516
 517     // If we have a normal #include dir/framework/headermap that is shadowed
 518     // later in the chain by a system include location, we actually want to
 519     // ignore the user's request and drop the user dir... keeping the system
 520     // dir.  This is weird, but required to emulate GCC's search path correctly.
 521     //
 522     // Since dupes of system dirs are rare, just rescan to find the original
 523     // that we're nuking instead of using a DenseMap.
 524     if (CurEntry.getDirCharacteristic() != SrcMgr::C_User) {
 525       // Find the dir that this is the same of.
 526       unsigned FirstDir;
 527       for (FirstDir = First;; ++FirstDir) {
 528         assert(FirstDir != i && "Didn't find dupe?");
 529
 530         const DirectoryLookup &SearchEntry = SearchList[FirstDir];
 531
 532         // If these are different lookup types, then they can't be the dupe.
 533         if (SearchEntry.getLookupType() != CurEntry.getLookupType())
 534           continue;
 535
 536         bool isSame;
 537         if (CurEntry.isNormalDir())
 538           isSame = SearchEntry.getDir() == CurEntry.getDir();
 539         else if (CurEntry.isFramework())
 540           isSame = SearchEntry.getFrameworkDir() == CurEntry.getFrameworkDir();
 541         else {
 542           assert(CurEntry.isHeaderMap() && "Not a headermap or normal dir?");
 543           isSame = SearchEntry.getHeaderMap() == CurEntry.getHeaderMap();
 544         }
 545
 546         if (isSame)
 547           break;
 548       }
 549
 550       // If the first dir in the search path is a non-system dir, zap it
 551       // instead of the system one.
 552       if (SearchList[FirstDir].getDirCharacteristic() == SrcMgr::C_User)
 553         DirToRemove = FirstDir;
 554     }
 555
 556     if (Verbose) {
 557       llvm::errs() << "ignoring duplicate directory \""
 558                    << CurEntry.getName() << "\"\n";
 559       if (DirToRemove != i)
 560         llvm::errs() << "  as it is a non-system directory that duplicates "
 561                      << "a system directory\n";
 562     }
 563     if (DirToRemove != i)
 564       ++NonSystemRemoved;
 565
 566     // This is reached if the current entry is a duplicate.  Remove the
 567     // DirToRemove (usually the current dir).
 568     SearchList.erase(SearchList.begin()+DirToRemove);
 569     --i;
 570   }
 571   return NonSystemRemoved;
 572 }
 573
 574
 575 void InitHeaderSearch::Realize(const LangOptions &Lang) {
 576   // Concatenate ANGLE+SYSTEM+AFTER chains together into SearchList.
 577   std::vector<DirectoryLookup> SearchList;
 578   SearchList.reserve(IncludePath.size());
 579
 580   // Quoted arguments go first.
 581   for (auto &Include : IncludePath)
 582     if (Include.first == Quoted)
 583       SearchList.push_back(Include.second);
 584
 585   // Deduplicate and remember index.
 586   RemoveDuplicates(SearchList, 0, Verbose);
 587   unsigned NumQuoted = SearchList.size();
 588
 589   for (auto &Include : IncludePath)
 590     if (Include.first == Angled || Include.first == IndexHeaderMap)
 591       SearchList.push_back(Include.second);
 592
 593   RemoveDuplicates(SearchList, NumQuoted, Verbose);
 594   unsigned NumAngled = SearchList.size();
 595
 596   for (auto &Include : IncludePath)
 597     if (Include.first == System || Include.first == ExternCSystem ||
 598         (!Lang.ObjC && !Lang.CPlusPlus && Include.first == CSystem) ||
 599         (/*FIXME !Lang.ObjC && */ Lang.CPlusPlus &&
 600          Include.first == CXXSystem) ||
 601         (Lang.ObjC && !Lang.CPlusPlus && Include.first == ObjCSystem) ||
 602         (Lang.ObjC && Lang.CPlusPlus && Include.first == ObjCXXSystem))
 603       SearchList.push_back(Include.second);
 604
 605   for (auto &Include : IncludePath)
 606     if (Include.first == After)
 607       SearchList.push_back(Include.second);
 608
 609   // Remove duplicates across both the Angled and System directories.  GCC does
 610   // this and failing to remove duplicates across these two groups breaks
 611   // #include_next.
 612   unsigned NonSystemRemoved = RemoveDuplicates(SearchList, NumQuoted, Verbose);
 613   NumAngled -= NonSystemRemoved;
 614
 615   bool DontSearchCurDir = false;  // TODO: set to true if -I- is set?
 616   Headers.SetSearchPaths(SearchList, NumQuoted, NumAngled, DontSearchCurDir);
 617
 618   Headers.SetSystemHeaderPrefixes(SystemHeaderPrefixes);
 619
 620   // If verbose, print the list of directories that will be searched.
 621   if (Verbose) {
 622     llvm::errs() << "#include \"...\" search starts here:\n";
 623     for (unsigned i = 0, e = SearchList.size(); i != e; ++i) {
 624       if (i == NumQuoted)
 625         llvm::errs() << "#include <...> search starts here:\n";
 626       StringRef Name = SearchList[i].getName();
 627       const char *Suffix;
 628       if (SearchList[i].isNormalDir())
 629         Suffix = "";
 630       else if (SearchList[i].isFramework())
 631         Suffix = " (framework directory)";
 632       else {
 633         assert(SearchList[i].isHeaderMap() && "Unknown DirectoryLookup");
 634         Suffix = " (headermap)";
 635       }
 636       llvm::errs() << " " << Name << Suffix << "\n";
 637     }
 638     llvm::errs() << "End of search list.\n";
 639   }
 640 }
 641
 642 void clang::ApplyHeaderSearchOptions(HeaderSearch &HS,
 643                                      const HeaderSearchOptions &HSOpts,
 644                                      const LangOptions &Lang,
 645                                      const llvm::Triple &Triple) {
 646   InitHeaderSearch Init(HS, HSOpts.Verbose, HSOpts.Sysroot);
 647
 648   // Add the user defined entries.
 649   for (unsigned i = 0, e = HSOpts.UserEntries.size(); i != e; ++i) {
 650     const HeaderSearchOptions::Entry &E = HSOpts.UserEntries[i];
 651     if (E.IgnoreSysRoot) {
 652       Init.AddUnmappedPath(E.Path, E.Group, E.IsFramework);
 653     } else {
 654       Init.AddPath(E.Path, E.Group, E.IsFramework);
 655     }
 656   }
 657
 658   Init.AddDefaultIncludePaths(Lang, Triple, HSOpts);
 659
 660   for (unsigned i = 0, e = HSOpts.SystemHeaderPrefixes.size(); i != e; ++i)
 661     Init.AddSystemHeaderPrefix(HSOpts.SystemHeaderPrefixes[i].Prefix,
 662                                HSOpts.SystemHeaderPrefixes[i].IsSystemHeader);
 663
 664   if (HSOpts.UseBuiltinIncludes) {
 665     // Set up the builtin include directory in the module map.
 666     SmallString<128> P = StringRef(HSOpts.ResourceDir);
 667     llvm::sys::path::append(P, "include");
 668     if (const DirectoryEntry *Dir = HS.getFileMgr().getDirectory(P))
 669       HS.getModuleMap().setBuiltinIncludeDir(Dir);
 670   }
 671
 672   Init.Realize(Lang);
 673 }