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/Frontend/Utils.h"
  15 #include "clang/Basic/FileManager.h"
  16 #include "clang/Basic/LangOptions.h"
  17 #include "clang/Config/config.h" // C_INCLUDE_DIRS
  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/FileSystem.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   void 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   void AddUnmappedPath(const Twine &Path, IncludeDirGroup Group,
  64                        bool isFramework);
  65
  66   /// AddSystemHeaderPrefix - Add the specified prefix to the system header
  67   /// prefix list.
  68   void AddSystemHeaderPrefix(StringRef Prefix, bool IsSystemHeader) {
  69     SystemHeaderPrefixes.emplace_back(Prefix, IsSystemHeader);
  70   }
  71
  72   /// AddGnuCPlusPlusIncludePaths - Add the necessary paths to support a gnu
  73   ///  libstdc++.
  74   void AddGnuCPlusPlusIncludePaths(StringRef Base,
  75                                    StringRef ArchDir,
  76                                    StringRef Dir32,
  77                                    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 llvm::Triple &triple,
  93                                        const HeaderSearchOptions &HSOpts);
  94
  95   /// AddDefaultSystemIncludePaths - Adds the default system include paths so
  96   ///  that e.g. stdio.h is found.
  97   void AddDefaultIncludePaths(const LangOptions &Lang,
  98                               const llvm::Triple &triple,
  99                               const HeaderSearchOptions &HSOpts);
 100
 101   /// Realize - Merges all search path lists into one list and send it to
 102   /// HeaderSearch.
 103   void Realize(const LangOptions &Lang);
 104 };
 105
 106 }  // end anonymous namespace.
 107
 108 static bool CanPrefixSysroot(StringRef Path) {
 109 #if defined(LLVM_ON_WIN32)
 110   return !Path.empty() && llvm::sys::path::is_separator(Path[0]);
 111 #else
 112   return llvm::sys::path::is_absolute(Path);
 113 #endif
 114 }
 115
 116 void InitHeaderSearch::AddPath(const Twine &Path, IncludeDirGroup Group,
 117                                bool isFramework) {
 118   // Add the path with sysroot prepended, if desired and this is a system header
 119   // group.
 120   if (HasSysroot) {
 121     SmallString<256> MappedPathStorage;
 122     StringRef MappedPathStr = Path.toStringRef(MappedPathStorage);
 123     if (CanPrefixSysroot(MappedPathStr)) {
 124       AddUnmappedPath(IncludeSysroot + Path, Group, isFramework);
 125       return;
 126     }
 127   }
 128
 129   AddUnmappedPath(Path, Group, isFramework);
 130 }
 131
 132 void 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   // Compute the DirectoryLookup type.
 141   SrcMgr::CharacteristicKind Type;
 142   if (Group == Quoted || Group == Angled || Group == IndexHeaderMap) {
 143     Type = SrcMgr::C_User;
 144   } else if (Group == ExternCSystem) {
 145     Type = SrcMgr::C_ExternCSystem;
 146   } else {
 147     Type = SrcMgr::C_System;
 148   }
 149
 150   // If the directory exists, add it.
 151   if (const DirectoryEntry *DE = FM.getDirectory(MappedPathStr)) {
 152     IncludePath.push_back(
 153       std::make_pair(Group, DirectoryLookup(DE, Type, isFramework)));
 154     return;
 155   }
 156
 157   // Check to see if this is an apple-style headermap (which are not allowed to
 158   // be frameworks).
 159   if (!isFramework) {
 160     if (const FileEntry *FE = FM.getFile(MappedPathStr)) {
 161       if (const HeaderMap *HM = Headers.CreateHeaderMap(FE)) {
 162         // It is a headermap, add it to the search path.
 163         IncludePath.push_back(
 164           std::make_pair(Group,
 165                          DirectoryLookup(HM, Type, Group == IndexHeaderMap)));
 166         return;
 167       }
 168     }
 169   }
 170
 171   if (Verbose)
 172     llvm::errs() << "ignoring nonexistent directory \""
 173                  << MappedPathStr << "\"\n";
 174 }
 175
 176 void InitHeaderSearch::AddGnuCPlusPlusIncludePaths(StringRef Base,
 177                                                    StringRef ArchDir,
 178                                                    StringRef Dir32,
 179                                                    StringRef Dir64,
 180                                                    const llvm::Triple &triple) {
 181   // Add the base dir
 182   AddPath(Base, CXXSystem, false);
 183
 184   // Add the multilib dirs
 185   llvm::Triple::ArchType arch = triple.getArch();
 186   bool is64bit = arch == llvm::Triple::ppc64 || arch == llvm::Triple::x86_64;
 187   if (is64bit)
 188     AddPath(Base + "/" + ArchDir + "/" + Dir64, CXXSystem, false);
 189   else
 190     AddPath(Base + "/" + ArchDir + "/" + Dir32, CXXSystem, false);
 191
 192   // Add the backward dir
 193   AddPath(Base + "/backward", CXXSystem, false);
 194 }
 195
 196 void InitHeaderSearch::AddMinGWCPlusPlusIncludePaths(StringRef Base,
 197                                                      StringRef Arch,
 198                                                      StringRef Version) {
 199   AddPath(Base + "/" + Arch + "/" + Version + "/include/c++",
 200           CXXSystem, false);
 201   AddPath(Base + "/" + Arch + "/" + Version + "/include/c++/" + Arch,
 202           CXXSystem, false);
 203   AddPath(Base + "/" + Arch + "/" + Version + "/include/c++/backward",
 204           CXXSystem, false);
 205 }
 206
 207 void InitHeaderSearch::AddDefaultCIncludePaths(const llvm::Triple &triple,
 208                                             const HeaderSearchOptions &HSOpts) {
 209   llvm::Triple::OSType os = triple.getOS();
 210
 211   if (HSOpts.UseStandardSystemIncludes) {
 212     switch (os) {
 213     case llvm::Triple::CloudABI:
 214     case llvm::Triple::FreeBSD:
 215     case llvm::Triple::NetBSD:
 216     case llvm::Triple::OpenBSD:
 217     case llvm::Triple::Bitrig:
 218     case llvm::Triple::NaCl:
 219     case llvm::Triple::PS4:
 220     case llvm::Triple::ELFIAMCU:
 221       break;
 222     case llvm::Triple::Win32:
 223       if (triple.getEnvironment() != llvm::Triple::Cygnus)
 224         break;
 225     default:
 226       // FIXME: temporary hack: hard-coded paths.
 227       AddPath("/usr/local/include", System, false);
 228       break;
 229     }
 230   }
 231
 232   // Builtin includes use #include_next directives and should be positioned
 233   // just prior C include dirs.
 234   if (HSOpts.UseBuiltinIncludes) {
 235     // Ignore the sys root, we *always* look for clang headers relative to
 236     // supplied path.
 237     SmallString<128> P = StringRef(HSOpts.ResourceDir);
 238     llvm::sys::path::append(P, "include");
 239     AddUnmappedPath(P, ExternCSystem, false);
 240   }
 241
 242   // All remaining additions are for system include directories, early exit if
 243   // we aren't using them.
 244   if (!HSOpts.UseStandardSystemIncludes)
 245     return;
 246
 247   // Add dirs specified via 'configure --with-c-include-dirs'.
 248   StringRef CIncludeDirs(C_INCLUDE_DIRS);
 249   if (CIncludeDirs != "") {
 250     SmallVector<StringRef, 5> dirs;
 251     CIncludeDirs.split(dirs, ":");
 252     for (StringRef dir : dirs)
 253       AddPath(dir, ExternCSystem, false);
 254     return;
 255   }
 256
 257   switch (os) {
 258   case llvm::Triple::Linux:
 259     llvm_unreachable("Include management is handled in the driver.");
 260
 261   case llvm::Triple::CloudABI: {
 262     // <sysroot>/<triple>/include
 263     SmallString<128> P = StringRef(HSOpts.ResourceDir);
 264     llvm::sys::path::append(P, "../../..", triple.str(), "include");
 265     AddPath(P, System, false);
 266     break;
 267   }
 268
 269   case llvm::Triple::Haiku:
 270     AddPath("/boot/system/non-packaged/develop/headers", System, false);
 271     AddPath("/boot/system/develop/headers/os", System, false);
 272     AddPath("/boot/system/develop/headers/os/app", System, false);
 273     AddPath("/boot/system/develop/headers/os/arch", System, false);
 274     AddPath("/boot/system/develop/headers/os/device", System, false);
 275     AddPath("/boot/system/develop/headers/os/drivers", System, false);
 276     AddPath("/boot/system/develop/headers/os/game", System, false);
 277     AddPath("/boot/system/develop/headers/os/interface", System, false);
 278     AddPath("/boot/system/develop/headers/os/kernel", System, false);
 279     AddPath("/boot/system/develop/headers/os/locale", System, false);
 280     AddPath("/boot/system/develop/headers/os/mail", System, false);
 281     AddPath("/boot/system/develop/headers/os/media", System, false);
 282     AddPath("/boot/system/develop/headers/os/midi", System, false);
 283     AddPath("/boot/system/develop/headers/os/midi2", System, false);
 284     AddPath("/boot/system/develop/headers/os/net", System, false);
 285     AddPath("/boot/system/develop/headers/os/opengl", System, false);
 286     AddPath("/boot/system/develop/headers/os/storage", System, false);
 287     AddPath("/boot/system/develop/headers/os/support", System, false);
 288     AddPath("/boot/system/develop/headers/os/translation", System, false);
 289     AddPath("/boot/system/develop/headers/os/add-ons/graphics", System, false);
 290     AddPath("/boot/system/develop/headers/os/add-ons/input_server", System, false);
 291     AddPath("/boot/system/develop/headers/os/add-ons/mail_daemon", System, false);
 292     AddPath("/boot/system/develop/headers/os/add-ons/registrar", System, false);
 293     AddPath("/boot/system/develop/headers/os/add-ons/screen_saver", System, false);
 294     AddPath("/boot/system/develop/headers/os/add-ons/tracker", System, false);
 295     AddPath("/boot/system/develop/headers/os/be_apps/Deskbar", System, false);
 296     AddPath("/boot/system/develop/headers/os/be_apps/NetPositive", System, false);
 297     AddPath("/boot/system/develop/headers/os/be_apps/Tracker", System, false);
 298     AddPath("/boot/system/develop/headers/3rdparty", System, false);
 299     AddPath("/boot/system/develop/headers/bsd", System, false);
 300     AddPath("/boot/system/develop/headers/glibc", System, false);
 301     AddPath("/boot/system/develop/headers/posix", System, false);
 302     AddPath("/boot/system/develop/headers",  System, false);
 303     break;
 304   case llvm::Triple::RTEMS:
 305     break;
 306   case llvm::Triple::Win32:
 307     switch (triple.getEnvironment()) {
 308     default: llvm_unreachable("Include management is handled in the driver.");
 309     case llvm::Triple::Cygnus:
 310       AddPath("/usr/include/w32api", System, false);
 311       break;
 312     case llvm::Triple::GNU:
 313       break;
 314     }
 315     break;
 316   default:
 317     break;
 318   }
 319
 320   switch (os) {
 321   case llvm::Triple::CloudABI:
 322   case llvm::Triple::RTEMS:
 323   case llvm::Triple::NaCl:
 324   case llvm::Triple::ELFIAMCU:
 325     break;
 326   case llvm::Triple::PS4: {
 327     // <isysroot> gets prepended later in AddPath().
 328     std::string BaseSDKPath = "";
 329     if (!HasSysroot) {
 330       const char *envValue = getenv("SCE_ORBIS_SDK_DIR");
 331       if (envValue)
 332         BaseSDKPath = envValue;
 333       else {
 334         // HSOpts.ResourceDir variable contains the location of Clang's
 335         // resource files.
 336         // Assuming that Clang is configured for PS4 without
 337         // --with-clang-resource-dir option, the location of Clang's resource
 338         // files is <SDK_DIR>/host_tools/lib/clang
 339         SmallString<128> P = StringRef(HSOpts.ResourceDir);
 340         llvm::sys::path::append(P, "../../..");
 341         BaseSDKPath = P.str();
 342       }
 343     }
 344     AddPath(BaseSDKPath + "/target/include", System, false);
 345     if (triple.isPS4CPU())
 346       AddPath(BaseSDKPath + "/target/include_common", System, false);
 347   }
 348   default:
 349     AddPath("/usr/include", ExternCSystem, false);
 350     break;
 351   }
 352 }
 353
 354 void InitHeaderSearch::
 355 AddDefaultCPlusPlusIncludePaths(const llvm::Triple &triple, const HeaderSearchOptions &HSOpts) {
 356   llvm::Triple::OSType os = triple.getOS();
 357   // FIXME: temporary hack: hard-coded paths.
 358
 359   if (triple.isOSDarwin()) {
 360     switch (triple.getArch()) {
 361     default: break;
 362
 363     case llvm::Triple::ppc:
 364     case llvm::Triple::ppc64:
 365       AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.2.1",
 366                                   "powerpc-apple-darwin10", "", "ppc64",
 367                                   triple);
 368       AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.0.0",
 369                                   "powerpc-apple-darwin10", "", "ppc64",
 370                                   triple);
 371       break;
 372
 373     case llvm::Triple::x86:
 374     case llvm::Triple::x86_64:
 375       AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.2.1",
 376                                   "i686-apple-darwin10", "", "x86_64", triple);
 377       AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.0.0",
 378                                   "i686-apple-darwin8", "", "", triple);
 379       break;
 380
 381     case llvm::Triple::arm:
 382     case llvm::Triple::thumb:
 383       AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.2.1",
 384                                   "arm-apple-darwin10", "v7", "", triple);
 385       AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.2.1",
 386                                   "arm-apple-darwin10", "v6", "", triple);
 387       break;
 388
 389     case llvm::Triple::aarch64:
 390       AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.2.1",
 391                                   "arm64-apple-darwin10", "", "", triple);
 392       break;
 393     }
 394     return;
 395   }
 396
 397   switch (os) {
 398   case llvm::Triple::Linux:
 399     llvm_unreachable("Include management is handled in the driver.");
 400     break;
 401   case llvm::Triple::Win32:
 402     switch (triple.getEnvironment()) {
 403     default: llvm_unreachable("Include management is handled in the driver.");
 404     case llvm::Triple::Cygnus:
 405       // Cygwin-1.7
 406       AddMinGWCPlusPlusIncludePaths("/usr/lib/gcc", "i686-pc-cygwin", "4.7.3");
 407       AddMinGWCPlusPlusIncludePaths("/usr/lib/gcc", "i686-pc-cygwin", "4.5.3");
 408       AddMinGWCPlusPlusIncludePaths("/usr/lib/gcc", "i686-pc-cygwin", "4.3.4");
 409       // g++-4 / Cygwin-1.5
 410       AddMinGWCPlusPlusIncludePaths("/usr/lib/gcc", "i686-pc-cygwin", "4.3.2");
 411       break;
 412     }
 413     break;
 414   case llvm::Triple::DragonFly:
 415     AddPath("/usr/include/c++/5.0", CXXSystem, false);
 416     break;
 417   case llvm::Triple::OpenBSD: {
 418     std::string t = triple.getTriple();
 419     if (t.substr(0, 6) == "x86_64")
 420       t.replace(0, 6, "amd64");
 421     AddGnuCPlusPlusIncludePaths("/usr/include/g++",
 422                                 t, "", "", triple);
 423     break;
 424   }
 425   case llvm::Triple::Minix:
 426     AddGnuCPlusPlusIncludePaths("/usr/gnu/include/c++/4.4.3",
 427                                 "", "", "", triple);
 428     break;
 429   default:
 430     break;
 431   }
 432 }
 433
 434 void InitHeaderSearch::AddDefaultIncludePaths(const LangOptions &Lang,
 435                                               const llvm::Triple &triple,
 436                                             const HeaderSearchOptions &HSOpts) {
 437   // NB: This code path is going away. All of the logic is moving into the
 438   // driver which has the information necessary to do target-specific
 439   // selections of default include paths. Each target which moves there will be
 440   // exempted from this logic here until we can delete the entire pile of code.
 441   switch (triple.getOS()) {
 442   default:
 443     break; // Everything else continues to use this routine's logic.
 444
 445   case llvm::Triple::Linux:
 446     return;
 447
 448   case llvm::Triple::Win32:
 449     if (triple.getEnvironment() != llvm::Triple::Cygnus ||
 450         triple.isOSBinFormatMachO())
 451       return;
 452     break;
 453   }
 454
 455   if (Lang.CPlusPlus && HSOpts.UseStandardCXXIncludes &&
 456       HSOpts.UseStandardSystemIncludes) {
 457     if (HSOpts.UseLibcxx) {
 458       if (triple.isOSDarwin()) {
 459         // On Darwin, libc++ may be installed alongside the compiler in
 460         // include/c++/v1.
 461         if (!HSOpts.ResourceDir.empty()) {
 462           // Remove version from foo/lib/clang/version
 463           StringRef NoVer = llvm::sys::path::parent_path(HSOpts.ResourceDir);
 464           // Remove clang from foo/lib/clang
 465           StringRef Lib = llvm::sys::path::parent_path(NoVer);
 466           // Remove lib from foo/lib
 467           SmallString<128> P = llvm::sys::path::parent_path(Lib);
 468
 469           // Get foo/include/c++/v1
 470           llvm::sys::path::append(P, "include", "c++", "v1");
 471           AddUnmappedPath(P, CXXSystem, false);
 472         }
 473       }
 474       AddPath("/usr/include/c++/v1", CXXSystem, false);
 475     } else {
 476       AddDefaultCPlusPlusIncludePaths(triple, HSOpts);
 477     }
 478   }
 479
 480   AddDefaultCIncludePaths(triple, HSOpts);
 481
 482   // Add the default framework include paths on Darwin.
 483   if (HSOpts.UseStandardSystemIncludes) {
 484     if (triple.isOSDarwin()) {
 485       AddPath("/System/Library/Frameworks", System, true);
 486       AddPath("/Library/Frameworks", System, true);
 487     }
 488   }
 489 }
 490
 491 /// RemoveDuplicates - If there are duplicate directory entries in the specified
 492 /// search list, remove the later (dead) ones.  Returns the number of non-system
 493 /// headers removed, which is used to update NumAngled.
 494 static unsigned RemoveDuplicates(std::vector<DirectoryLookup> &SearchList,
 495                                  unsigned First, bool Verbose) {
 496   llvm::SmallPtrSet<const DirectoryEntry *, 8> SeenDirs;
 497   llvm::SmallPtrSet<const DirectoryEntry *, 8> SeenFrameworkDirs;
 498   llvm::SmallPtrSet<const HeaderMap *, 8> SeenHeaderMaps;
 499   unsigned NonSystemRemoved = 0;
 500   for (unsigned i = First; i != SearchList.size(); ++i) {
 501     unsigned DirToRemove = i;
 502
 503     const DirectoryLookup &CurEntry = SearchList[i];
 504
 505     if (CurEntry.isNormalDir()) {
 506       // If this isn't the first time we've seen this dir, remove it.
 507       if (SeenDirs.insert(CurEntry.getDir()).second)
 508         continue;
 509     } else if (CurEntry.isFramework()) {
 510       // If this isn't the first time we've seen this framework dir, remove it.
 511       if (SeenFrameworkDirs.insert(CurEntry.getFrameworkDir()).second)
 512         continue;
 513     } else {
 514       assert(CurEntry.isHeaderMap() && "Not a headermap or normal dir?");
 515       // If this isn't the first time we've seen this headermap, remove it.
 516       if (SeenHeaderMaps.insert(CurEntry.getHeaderMap()).second)
 517         continue;
 518     }
 519
 520     // If we have a normal #include dir/framework/headermap that is shadowed
 521     // later in the chain by a system include location, we actually want to
 522     // ignore the user's request and drop the user dir... keeping the system
 523     // dir.  This is weird, but required to emulate GCC's search path correctly.
 524     //
 525     // Since dupes of system dirs are rare, just rescan to find the original
 526     // that we're nuking instead of using a DenseMap.
 527     if (CurEntry.getDirCharacteristic() != SrcMgr::C_User) {
 528       // Find the dir that this is the same of.
 529       unsigned FirstDir;
 530       for (FirstDir = 0; ; ++FirstDir) {
 531         assert(FirstDir != i && "Didn't find dupe?");
 532
 533         const DirectoryLookup &SearchEntry = SearchList[FirstDir];
 534
 535         // If these are different lookup types, then they can't be the dupe.
 536         if (SearchEntry.getLookupType() != CurEntry.getLookupType())
 537           continue;
 538
 539         bool isSame;
 540         if (CurEntry.isNormalDir())
 541           isSame = SearchEntry.getDir() == CurEntry.getDir();
 542         else if (CurEntry.isFramework())
 543           isSame = SearchEntry.getFrameworkDir() == CurEntry.getFrameworkDir();
 544         else {
 545           assert(CurEntry.isHeaderMap() && "Not a headermap or normal dir?");
 546           isSame = SearchEntry.getHeaderMap() == CurEntry.getHeaderMap();
 547         }
 548
 549         if (isSame)
 550           break;
 551       }
 552
 553       // If the first dir in the search path is a non-system dir, zap it
 554       // instead of the system one.
 555       if (SearchList[FirstDir].getDirCharacteristic() == SrcMgr::C_User)
 556         DirToRemove = FirstDir;
 557     }
 558
 559     if (Verbose) {
 560       llvm::errs() << "ignoring duplicate directory \""
 561                    << CurEntry.getName() << "\"\n";
 562       if (DirToRemove != i)
 563         llvm::errs() << "  as it is a non-system directory that duplicates "
 564                      << "a system directory\n";
 565     }
 566     if (DirToRemove != i)
 567       ++NonSystemRemoved;
 568
 569     // This is reached if the current entry is a duplicate.  Remove the
 570     // DirToRemove (usually the current dir).
 571     SearchList.erase(SearchList.begin()+DirToRemove);
 572     --i;
 573   }
 574   return NonSystemRemoved;
 575 }
 576
 577
 578 void InitHeaderSearch::Realize(const LangOptions &Lang) {
 579   // Concatenate ANGLE+SYSTEM+AFTER chains together into SearchList.
 580   std::vector<DirectoryLookup> SearchList;
 581   SearchList.reserve(IncludePath.size());
 582
 583   // Quoted arguments go first.
 584   for (auto &Include : IncludePath)
 585     if (Include.first == Quoted)
 586       SearchList.push_back(Include.second);
 587
 588   // Deduplicate and remember index.
 589   RemoveDuplicates(SearchList, 0, Verbose);
 590   unsigned NumQuoted = SearchList.size();
 591
 592   for (auto &Include : IncludePath)
 593     if (Include.first == Angled || Include.first == IndexHeaderMap)
 594       SearchList.push_back(Include.second);
 595
 596   RemoveDuplicates(SearchList, NumQuoted, Verbose);
 597   unsigned NumAngled = SearchList.size();
 598
 599   for (auto &Include : IncludePath)
 600     if (Include.first == System || Include.first == ExternCSystem ||
 601         (!Lang.ObjC1 && !Lang.CPlusPlus && Include.first == CSystem) ||
 602         (/*FIXME !Lang.ObjC1 && */ Lang.CPlusPlus &&
 603          Include.first == CXXSystem) ||
 604         (Lang.ObjC1 && !Lang.CPlusPlus && Include.first == ObjCSystem) ||
 605         (Lang.ObjC1 && Lang.CPlusPlus && Include.first == ObjCXXSystem))
 606       SearchList.push_back(Include.second);
 607
 608   for (auto &Include : IncludePath)
 609     if (Include.first == After)
 610       SearchList.push_back(Include.second);
 611
 612   // Remove duplicates across both the Angled and System directories.  GCC does
 613   // this and failing to remove duplicates across these two groups breaks
 614   // #include_next.
 615   unsigned NonSystemRemoved = RemoveDuplicates(SearchList, NumQuoted, Verbose);
 616   NumAngled -= NonSystemRemoved;
 617
 618   bool DontSearchCurDir = false;  // TODO: set to true if -I- is set?
 619   Headers.SetSearchPaths(SearchList, NumQuoted, NumAngled, DontSearchCurDir);
 620
 621   Headers.SetSystemHeaderPrefixes(SystemHeaderPrefixes);
 622
 623   // If verbose, print the list of directories that will be searched.
 624   if (Verbose) {
 625     llvm::errs() << "#include \"...\" search starts here:\n";
 626     for (unsigned i = 0, e = SearchList.size(); i != e; ++i) {
 627       if (i == NumQuoted)
 628         llvm::errs() << "#include <...> search starts here:\n";
 629       const char *Name = SearchList[i].getName();
 630       const char *Suffix;
 631       if (SearchList[i].isNormalDir())
 632         Suffix = "";
 633       else if (SearchList[i].isFramework())
 634         Suffix = " (framework directory)";
 635       else {
 636         assert(SearchList[i].isHeaderMap() && "Unknown DirectoryLookup");
 637         Suffix = " (headermap)";
 638       }
 639       llvm::errs() << " " << Name << Suffix << "\n";
 640     }
 641     llvm::errs() << "End of search list.\n";
 642   }
 643 }
 644
 645 void clang::ApplyHeaderSearchOptions(HeaderSearch &HS,
 646                                      const HeaderSearchOptions &HSOpts,
 647                                      const LangOptions &Lang,
 648                                      const llvm::Triple &Triple) {
 649   InitHeaderSearch Init(HS, HSOpts.Verbose, HSOpts.Sysroot);
 650
 651   // Add the user defined entries.
 652   for (unsigned i = 0, e = HSOpts.UserEntries.size(); i != e; ++i) {
 653     const HeaderSearchOptions::Entry &E = HSOpts.UserEntries[i];
 654     if (E.IgnoreSysRoot) {
 655       Init.AddUnmappedPath(E.Path, E.Group, E.IsFramework);
 656     } else {
 657       Init.AddPath(E.Path, E.Group, E.IsFramework);
 658     }
 659   }
 660
 661   Init.AddDefaultIncludePaths(Lang, Triple, HSOpts);
 662
 663   for (unsigned i = 0, e = HSOpts.SystemHeaderPrefixes.size(); i != e; ++i)
 664     Init.AddSystemHeaderPrefix(HSOpts.SystemHeaderPrefixes[i].Prefix,
 665                                HSOpts.SystemHeaderPrefixes[i].IsSystemHeader);
 666
 667   if (HSOpts.UseBuiltinIncludes) {
 668     // Set up the builtin include directory in the module map.
 669     SmallString<128> P = StringRef(HSOpts.ResourceDir);
 670     llvm::sys::path::append(P, "include");
 671     if (const DirectoryEntry *Dir = HS.getFileMgr().getDirectory(P))
 672       HS.getModuleMap().setBuiltinIncludeDir(Dir);
 673   }
 674
 675   Init.Realize(Lang);
 676 }