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/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
  31 using namespace clang;
  32 using namespace clang::frontend;
  33
  34 namespace {
  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.
  39 class 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
  49 public:
  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   void AddPath(const Twine &Path, IncludeDirGroup Group, bool isFramework);
  59
  60   /// AddUnmappedPath - Add the specified path to the specified group list,
  61   /// without performing any sysroot remapping.
  62   void AddUnmappedPath(const Twine &Path, IncludeDirGroup Group,
  63                        bool isFramework);
  64
  65   /// AddSystemHeaderPrefix - Add the specified prefix to the system header
  66   /// prefix list.
  67   void AddSystemHeaderPrefix(StringRef Prefix, bool IsSystemHeader) {
  68     SystemHeaderPrefixes.emplace_back(Prefix, IsSystemHeader);
  69   }
  70
  71   /// AddGnuCPlusPlusIncludePaths - Add the necessary paths to support a gnu
  72   ///  libstdc++.
  73   void AddGnuCPlusPlusIncludePaths(StringRef Base,
  74                                    StringRef ArchDir,
  75                                    StringRef Dir32,
  76                                    StringRef Dir64,
  77                                    const llvm::Triple &triple);
  78
  79   /// AddMinGWCPlusPlusIncludePaths - Add the necessary paths to support a MinGW
  80   ///  libstdc++.
  81   void AddMinGWCPlusPlusIncludePaths(StringRef Base,
  82                                      StringRef Arch,
  83                                      StringRef Version);
  84
  85   // AddDefaultCIncludePaths - Add paths that should always be searched.
  86   void AddDefaultCIncludePaths(const llvm::Triple &triple,
  87                                const HeaderSearchOptions &HSOpts);
  88
  89   // AddDefaultCPlusPlusIncludePaths -  Add paths that should be searched when
  90   //  compiling c++.
  91   void AddDefaultCPlusPlusIncludePaths(const llvm::Triple &triple,
  92                                        const HeaderSearchOptions &HSOpts);
  93
  94   /// AddDefaultSystemIncludePaths - Adds the default system include paths so
  95   ///  that e.g. stdio.h is found.
  96   void AddDefaultIncludePaths(const LangOptions &Lang,
  97                               const llvm::Triple &triple,
  98                               const HeaderSearchOptions &HSOpts);
  99
 100   /// Realize - Merges all search path lists into one list and send it to
 101   /// HeaderSearch.
 102   void Realize(const LangOptions &Lang);
 103 };
 104
 105 }  // end anonymous namespace.
 106
 107 static bool CanPrefixSysroot(StringRef Path) {
 108 #if defined(LLVM_ON_WIN32)
 109   return !Path.empty() && llvm::sys::path::is_separator(Path[0]);
 110 #else
 111   return llvm::sys::path::is_absolute(Path);
 112 #endif
 113 }
 114
 115 void InitHeaderSearch::AddPath(const Twine &Path, IncludeDirGroup Group,
 116                                bool isFramework) {
 117   // Add the path with sysroot prepended, if desired and this is a system header
 118   // group.
 119   if (HasSysroot) {
 120     SmallString<256> MappedPathStorage;
 121     StringRef MappedPathStr = Path.toStringRef(MappedPathStorage);
 122     if (CanPrefixSysroot(MappedPathStr)) {
 123       AddUnmappedPath(IncludeSysroot + Path, Group, isFramework);
 124       return;
 125     }
 126   }
 127
 128   AddUnmappedPath(Path, Group, isFramework);
 129 }
 130
 131 void InitHeaderSearch::AddUnmappedPath(const Twine &Path, IncludeDirGroup Group,
 132                                        bool isFramework) {
 133   assert(!Path.isTriviallyEmpty() && "can't handle empty path here");
 134
 135   FileManager &FM = Headers.getFileMgr();
 136   SmallString<256> MappedPathStorage;
 137   StringRef MappedPathStr = Path.toStringRef(MappedPathStorage);
 138
 139   // Compute the DirectoryLookup type.
 140   SrcMgr::CharacteristicKind Type;
 141   if (Group == Quoted || Group == Angled || Group == IndexHeaderMap) {
 142     Type = SrcMgr::C_User;
 143   } else if (Group == ExternCSystem) {
 144     Type = SrcMgr::C_ExternCSystem;
 145   } else {
 146     Type = SrcMgr::C_System;
 147   }
 148
 149   // If the directory exists, add it.
 150   if (const DirectoryEntry *DE = FM.getDirectory(MappedPathStr)) {
 151     IncludePath.push_back(
 152       std::make_pair(Group, DirectoryLookup(DE, Type, isFramework)));
 153     return;
 154   }
 155
 156   // Check to see if this is an apple-style headermap (which are not allowed to
 157   // be frameworks).
 158   if (!isFramework) {
 159     if (const FileEntry *FE = FM.getFile(MappedPathStr)) {
 160       if (const HeaderMap *HM = Headers.CreateHeaderMap(FE)) {
 161         // It is a headermap, add it to the search path.
 162         IncludePath.push_back(
 163           std::make_pair(Group,
 164                          DirectoryLookup(HM, Type, Group == IndexHeaderMap)));
 165         return;
 166       }
 167     }
 168   }
 169
 170   if (Verbose)
 171     llvm::errs() << "ignoring nonexistent directory \""
 172                  << MappedPathStr << "\"\n";
 173 }
 174
 175 void InitHeaderSearch::AddGnuCPlusPlusIncludePaths(StringRef Base,
 176                                                    StringRef ArchDir,
 177                                                    StringRef Dir32,
 178                                                    StringRef Dir64,
 179                                                    const llvm::Triple &triple) {
 180   // Add the base dir
 181   AddPath(Base, CXXSystem, false);
 182
 183   // Add the multilib dirs
 184   llvm::Triple::ArchType arch = triple.getArch();
 185   bool is64bit = arch == llvm::Triple::ppc64 || arch == llvm::Triple::x86_64;
 186   if (is64bit)
 187     AddPath(Base + "/" + ArchDir + "/" + Dir64, CXXSystem, false);
 188   else
 189     AddPath(Base + "/" + ArchDir + "/" + Dir32, CXXSystem, false);
 190
 191   // Add the backward dir
 192   AddPath(Base + "/backward", CXXSystem, false);
 193 }
 194
 195 void InitHeaderSearch::AddMinGWCPlusPlusIncludePaths(StringRef Base,
 196                                                      StringRef Arch,
 197                                                      StringRef Version) {
 198   AddPath(Base + "/" + Arch + "/" + Version + "/include/c++",
 199           CXXSystem, false);
 200   AddPath(Base + "/" + Arch + "/" + Version + "/include/c++/" + Arch,
 201           CXXSystem, false);
 202   AddPath(Base + "/" + Arch + "/" + Version + "/include/c++/backward",
 203           CXXSystem, false);
 204 }
 205
 206 void InitHeaderSearch::AddDefaultCIncludePaths(const llvm::Triple &triple,
 207                                             const HeaderSearchOptions &HSOpts) {
 208   llvm::Triple::OSType os = triple.getOS();
 209
 210   if (HSOpts.UseStandardSystemIncludes) {
 211     switch (os) {
 212     case llvm::Triple::CloudABI:
 213     case llvm::Triple::FreeBSD:
 214     case llvm::Triple::NetBSD:
 215     case llvm::Triple::OpenBSD:
 216     case llvm::Triple::Bitrig:
 217     case llvm::Triple::NaCl:
 218     case llvm::Triple::PS4:
 219     case llvm::Triple::ELFIAMCU:
 220       break;
 221     case llvm::Triple::Win32:
 222       if (triple.getEnvironment() != llvm::Triple::Cygnus)
 223         break;
 224     default:
 225       // FIXME: temporary hack: hard-coded paths.
 226       AddPath("/usr/local/include", System, false);
 227       break;
 228     }
 229   }
 230
 231   // Builtin includes use #include_next directives and should be positioned
 232   // just prior C include dirs.
 233   if (HSOpts.UseBuiltinIncludes) {
 234     // Ignore the sys root, we *always* look for clang headers relative to
 235     // supplied path.
 236     SmallString<128> P = StringRef(HSOpts.ResourceDir);
 237     llvm::sys::path::append(P, "include");
 238     AddUnmappedPath(P, ExternCSystem, false);
 239   }
 240
 241   // All remaining additions are for system include directories, early exit if
 242   // we aren't using them.
 243   if (!HSOpts.UseStandardSystemIncludes)
 244     return;
 245
 246   // Add dirs specified via 'configure --with-c-include-dirs'.
 247   StringRef CIncludeDirs(C_INCLUDE_DIRS);
 248   if (CIncludeDirs != "") {
 249     SmallVector<StringRef, 5> dirs;
 250     CIncludeDirs.split(dirs, ":");
 251     for (StringRef dir : dirs)
 252       AddPath(dir, ExternCSystem, false);
 253     return;
 254   }
 255
 256   switch (os) {
 257   case llvm::Triple::Linux:
 258     llvm_unreachable("Include management is handled in the driver.");
 259
 260   case llvm::Triple::CloudABI: {
 261     // <sysroot>/<triple>/include
 262     SmallString<128> P = StringRef(HSOpts.ResourceDir);
 263     llvm::sys::path::append(P, "../../..", triple.str(), "include");
 264     AddPath(P, System, false);
 265     break;
 266   }
 267
 268   case llvm::Triple::Haiku:
 269     AddPath("/boot/system/non-packaged/develop/headers", System, false);
 270     AddPath("/boot/system/develop/headers/os", System, false);
 271     AddPath("/boot/system/develop/headers/os/app", System, false);
 272     AddPath("/boot/system/develop/headers/os/arch", System, false);
 273     AddPath("/boot/system/develop/headers/os/device", System, false);
 274     AddPath("/boot/system/develop/headers/os/drivers", System, false);
 275     AddPath("/boot/system/develop/headers/os/game", System, false);
 276     AddPath("/boot/system/develop/headers/os/interface", System, false);
 277     AddPath("/boot/system/develop/headers/os/kernel", System, false);
 278     AddPath("/boot/system/develop/headers/os/locale", System, false);
 279     AddPath("/boot/system/develop/headers/os/mail", System, false);
 280     AddPath("/boot/system/develop/headers/os/media", System, false);
 281     AddPath("/boot/system/develop/headers/os/midi", System, false);
 282     AddPath("/boot/system/develop/headers/os/midi2", System, false);
 283     AddPath("/boot/system/develop/headers/os/net", System, false);
 284     AddPath("/boot/system/develop/headers/os/opengl", System, false);
 285     AddPath("/boot/system/develop/headers/os/storage", System, false);
 286     AddPath("/boot/system/develop/headers/os/support", System, false);
 287     AddPath("/boot/system/develop/headers/os/translation", System, false);
 288     AddPath("/boot/system/develop/headers/os/add-ons/graphics", System, false);
 289     AddPath("/boot/system/develop/headers/os/add-ons/input_server", System, false);
 290     AddPath("/boot/system/develop/headers/os/add-ons/mail_daemon", System, false);
 291     AddPath("/boot/system/develop/headers/os/add-ons/registrar", System, false);
 292     AddPath("/boot/system/develop/headers/os/add-ons/screen_saver", System, false);
 293     AddPath("/boot/system/develop/headers/os/add-ons/tracker", System, false);
 294     AddPath("/boot/system/develop/headers/os/be_apps/Deskbar", System, false);
 295     AddPath("/boot/system/develop/headers/os/be_apps/NetPositive", System, false);
 296     AddPath("/boot/system/develop/headers/os/be_apps/Tracker", System, false);
 297     AddPath("/boot/system/develop/headers/3rdparty", System, false);
 298     AddPath("/boot/system/develop/headers/bsd", System, false);
 299     AddPath("/boot/system/develop/headers/glibc", System, false);
 300     AddPath("/boot/system/develop/headers/posix", System, false);
 301     AddPath("/boot/system/develop/headers",  System, false);
 302     break;
 303   case llvm::Triple::RTEMS:
 304     break;
 305   case llvm::Triple::Win32:
 306     switch (triple.getEnvironment()) {
 307     default: llvm_unreachable("Include management is handled in the driver.");
 308     case llvm::Triple::Cygnus:
 309       AddPath("/usr/include/w32api", System, false);
 310       break;
 311     case llvm::Triple::GNU:
 312       break;
 313     }
 314     break;
 315   default:
 316     break;
 317   }
 318
 319   switch (os) {
 320   case llvm::Triple::CloudABI:
 321   case llvm::Triple::RTEMS:
 322   case llvm::Triple::NaCl:
 323   case llvm::Triple::ELFIAMCU:
 324     break;
 325   case llvm::Triple::PS4: {
 326     // <isysroot> gets prepended later in AddPath().
 327     std::string BaseSDKPath = "";
 328     if (!HasSysroot) {
 329       const char *envValue = getenv("SCE_ORBIS_SDK_DIR");
 330       if (envValue)
 331         BaseSDKPath = envValue;
 332       else {
 333         // HSOpts.ResourceDir variable contains the location of Clang's
 334         // resource files.
 335         // Assuming that Clang is configured for PS4 without
 336         // --with-clang-resource-dir option, the location of Clang's resource
 337         // files is <SDK_DIR>/host_tools/lib/clang
 338         SmallString<128> P = StringRef(HSOpts.ResourceDir);
 339         llvm::sys::path::append(P, "../../..");
 340         BaseSDKPath = P.str();
 341       }
 342     }
 343     AddPath(BaseSDKPath + "/target/include", System, false);
 344     if (triple.isPS4CPU())
 345       AddPath(BaseSDKPath + "/target/include_common", System, false);
 346   }
 347   default:
 348     AddPath("/usr/include", ExternCSystem, false);
 349     break;
 350   }
 351 }
 352
 353 void InitHeaderSearch::
 354 AddDefaultCPlusPlusIncludePaths(const llvm::Triple &triple, const HeaderSearchOptions &HSOpts) {
 355   llvm::Triple::OSType os = triple.getOS();
 356   // FIXME: temporary hack: hard-coded paths.
 357
 358   if (triple.isOSDarwin()) {
 359     switch (triple.getArch()) {
 360     default: break;
 361
 362     case llvm::Triple::ppc:
 363     case llvm::Triple::ppc64:
 364       AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.2.1",
 365                                   "powerpc-apple-darwin10", "", "ppc64",
 366                                   triple);
 367       AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.0.0",
 368                                   "powerpc-apple-darwin10", "", "ppc64",
 369                                   triple);
 370       break;
 371
 372     case llvm::Triple::x86:
 373     case llvm::Triple::x86_64:
 374       AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.2.1",
 375                                   "i686-apple-darwin10", "", "x86_64", triple);
 376       AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.0.0",
 377                                   "i686-apple-darwin8", "", "", triple);
 378       break;
 379
 380     case llvm::Triple::arm:
 381     case llvm::Triple::thumb:
 382       AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.2.1",
 383                                   "arm-apple-darwin10", "v7", "", triple);
 384       AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.2.1",
 385                                   "arm-apple-darwin10", "v6", "", triple);
 386       break;
 387
 388     case llvm::Triple::aarch64:
 389       AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.2.1",
 390                                   "arm64-apple-darwin10", "", "", triple);
 391       break;
 392     }
 393     return;
 394   }
 395
 396   switch (os) {
 397   case llvm::Triple::Linux:
 398     llvm_unreachable("Include management is handled in the driver.");
 399     break;
 400   case llvm::Triple::Win32:
 401     switch (triple.getEnvironment()) {
 402     default: llvm_unreachable("Include management is handled in the driver.");
 403     case llvm::Triple::Cygnus:
 404       // Cygwin-1.7
 405       AddMinGWCPlusPlusIncludePaths("/usr/lib/gcc", "i686-pc-cygwin", "4.7.3");
 406       AddMinGWCPlusPlusIncludePaths("/usr/lib/gcc", "i686-pc-cygwin", "4.5.3");
 407       AddMinGWCPlusPlusIncludePaths("/usr/lib/gcc", "i686-pc-cygwin", "4.3.4");
 408       // g++-4 / Cygwin-1.5
 409       AddMinGWCPlusPlusIncludePaths("/usr/lib/gcc", "i686-pc-cygwin", "4.3.2");
 410       break;
 411     }
 412     break;
 413   case llvm::Triple::DragonFly:
 414     AddPath("/usr/include/c++/5.0", CXXSystem, false);
 415     break;
 416   case llvm::Triple::OpenBSD: {
 417     std::string t = triple.getTriple();
 418     if (t.substr(0, 6) == "x86_64")
 419       t.replace(0, 6, "amd64");
 420     AddGnuCPlusPlusIncludePaths("/usr/include/g++",
 421                                 t, "", "", triple);
 422     break;
 423   }
 424   case llvm::Triple::Minix:
 425     AddGnuCPlusPlusIncludePaths("/usr/gnu/include/c++/4.4.3",
 426                                 "", "", "", triple);
 427     break;
 428   default:
 429     break;
 430   }
 431 }
 432
 433 void InitHeaderSearch::AddDefaultIncludePaths(const LangOptions &Lang,
 434                                               const llvm::Triple &triple,
 435                                             const HeaderSearchOptions &HSOpts) {
 436   // NB: This code path is going away. All of the logic is moving into the
 437   // driver which has the information necessary to do target-specific
 438   // selections of default include paths. Each target which moves there will be
 439   // exempted from this logic here until we can delete the entire pile of code.
 440   switch (triple.getOS()) {
 441   default:
 442     break; // Everything else continues to use this routine's logic.
 443
 444   case llvm::Triple::Linux:
 445     return;
 446
 447   case llvm::Triple::Win32:
 448     if (triple.getEnvironment() != llvm::Triple::Cygnus ||
 449         triple.isOSBinFormatMachO())
 450       return;
 451     break;
 452   }
 453
 454   if (Lang.CPlusPlus && HSOpts.UseStandardCXXIncludes &&
 455       HSOpts.UseStandardSystemIncludes) {
 456     if (HSOpts.UseLibcxx) {
 457       if (triple.isOSDarwin()) {
 458         // On Darwin, libc++ may be installed alongside the compiler in
 459         // include/c++/v1.
 460         if (!HSOpts.ResourceDir.empty()) {
 461           // Remove version from foo/lib/clang/version
 462           StringRef NoVer = llvm::sys::path::parent_path(HSOpts.ResourceDir);
 463           // Remove clang from foo/lib/clang
 464           StringRef Lib = llvm::sys::path::parent_path(NoVer);
 465           // Remove lib from foo/lib
 466           SmallString<128> P = llvm::sys::path::parent_path(Lib);
 467
 468           // Get foo/include/c++/v1
 469           llvm::sys::path::append(P, "include", "c++", "v1");
 470           AddUnmappedPath(P, CXXSystem, false);
 471         }
 472       }
 473       AddPath("/usr/include/c++/v1", CXXSystem, false);
 474     } else {
 475       AddDefaultCPlusPlusIncludePaths(triple, HSOpts);
 476     }
 477   }
 478
 479   AddDefaultCIncludePaths(triple, HSOpts);
 480
 481   // Add the default framework include paths on Darwin.
 482   if (HSOpts.UseStandardSystemIncludes) {
 483     if (triple.isOSDarwin()) {
 484       AddPath("/System/Library/Frameworks", System, true);
 485       AddPath("/Library/Frameworks", System, true);
 486     }
 487   }
 488 }
 489
 490 /// RemoveDuplicates - If there are duplicate directory entries in the specified
 491 /// search list, remove the later (dead) ones.  Returns the number of non-system
 492 /// headers removed, which is used to update NumAngled.
 493 static unsigned RemoveDuplicates(std::vector<DirectoryLookup> &SearchList,
 494                                  unsigned First, bool Verbose) {
 495   llvm::SmallPtrSet<const DirectoryEntry *, 8> SeenDirs;
 496   llvm::SmallPtrSet<const DirectoryEntry *, 8> SeenFrameworkDirs;
 497   llvm::SmallPtrSet<const HeaderMap *, 8> SeenHeaderMaps;
 498   unsigned NonSystemRemoved = 0;
 499   for (unsigned i = First; i != SearchList.size(); ++i) {
 500     unsigned DirToRemove = i;
 501
 502     const DirectoryLookup &CurEntry = SearchList[i];
 503
 504     if (CurEntry.isNormalDir()) {
 505       // If this isn't the first time we've seen this dir, remove it.
 506       if (SeenDirs.insert(CurEntry.getDir()).second)
 507         continue;
 508     } else if (CurEntry.isFramework()) {
 509       // If this isn't the first time we've seen this framework dir, remove it.
 510       if (SeenFrameworkDirs.insert(CurEntry.getFrameworkDir()).second)
 511         continue;
 512     } else {
 513       assert(CurEntry.isHeaderMap() && "Not a headermap or normal dir?");
 514       // If this isn't the first time we've seen this headermap, remove it.
 515       if (SeenHeaderMaps.insert(CurEntry.getHeaderMap()).second)
 516         continue;
 517     }
 518
 519     // If we have a normal #include dir/framework/headermap that is shadowed
 520     // later in the chain by a system include location, we actually want to
 521     // ignore the user's request and drop the user dir... keeping the system
 522     // dir.  This is weird, but required to emulate GCC's search path correctly.
 523     //
 524     // Since dupes of system dirs are rare, just rescan to find the original
 525     // that we're nuking instead of using a DenseMap.
 526     if (CurEntry.getDirCharacteristic() != SrcMgr::C_User) {
 527       // Find the dir that this is the same of.
 528       unsigned FirstDir;
 529       for (FirstDir = First;; ++FirstDir) {
 530         assert(FirstDir != i && "Didn't find dupe?");
 531
 532         const DirectoryLookup &SearchEntry = SearchList[FirstDir];
 533
 534         // If these are different lookup types, then they can't be the dupe.
 535         if (SearchEntry.getLookupType() != CurEntry.getLookupType())
 536           continue;
 537
 538         bool isSame;
 539         if (CurEntry.isNormalDir())
 540           isSame = SearchEntry.getDir() == CurEntry.getDir();
 541         else if (CurEntry.isFramework())
 542           isSame = SearchEntry.getFrameworkDir() == CurEntry.getFrameworkDir();
 543         else {
 544           assert(CurEntry.isHeaderMap() && "Not a headermap or normal dir?");
 545           isSame = SearchEntry.getHeaderMap() == CurEntry.getHeaderMap();
 546         }
 547
 548         if (isSame)
 549           break;
 550       }
 551
 552       // If the first dir in the search path is a non-system dir, zap it
 553       // instead of the system one.
 554       if (SearchList[FirstDir].getDirCharacteristic() == SrcMgr::C_User)
 555         DirToRemove = FirstDir;
 556     }
 557
 558     if (Verbose) {
 559       llvm::errs() << "ignoring duplicate directory \""
 560                    << CurEntry.getName() << "\"\n";
 561       if (DirToRemove != i)
 562         llvm::errs() << "  as it is a non-system directory that duplicates "
 563                      << "a system directory\n";
 564     }
 565     if (DirToRemove != i)
 566       ++NonSystemRemoved;
 567
 568     // This is reached if the current entry is a duplicate.  Remove the
 569     // DirToRemove (usually the current dir).
 570     SearchList.erase(SearchList.begin()+DirToRemove);
 571     --i;
 572   }
 573   return NonSystemRemoved;
 574 }
 575
 576
 577 void InitHeaderSearch::Realize(const LangOptions &Lang) {
 578   // Concatenate ANGLE+SYSTEM+AFTER chains together into SearchList.
 579   std::vector<DirectoryLookup> SearchList;
 580   SearchList.reserve(IncludePath.size());
 581
 582   // Quoted arguments go first.
 583   for (auto &Include : IncludePath)
 584     if (Include.first == Quoted)
 585       SearchList.push_back(Include.second);
 586
 587   // Deduplicate and remember index.
 588   RemoveDuplicates(SearchList, 0, Verbose);
 589   unsigned NumQuoted = SearchList.size();
 590
 591   for (auto &Include : IncludePath)
 592     if (Include.first == Angled || Include.first == IndexHeaderMap)
 593       SearchList.push_back(Include.second);
 594
 595   RemoveDuplicates(SearchList, NumQuoted, Verbose);
 596   unsigned NumAngled = SearchList.size();
 597
 598   for (auto &Include : IncludePath)
 599     if (Include.first == System || Include.first == ExternCSystem ||
 600         (!Lang.ObjC1 && !Lang.CPlusPlus && Include.first == CSystem) ||
 601         (/*FIXME !Lang.ObjC1 && */ Lang.CPlusPlus &&
 602          Include.first == CXXSystem) ||
 603         (Lang.ObjC1 && !Lang.CPlusPlus && Include.first == ObjCSystem) ||
 604         (Lang.ObjC1 && Lang.CPlusPlus && Include.first == ObjCXXSystem))
 605       SearchList.push_back(Include.second);
 606
 607   for (auto &Include : IncludePath)
 608     if (Include.first == After)
 609       SearchList.push_back(Include.second);
 610
 611   // Remove duplicates across both the Angled and System directories.  GCC does
 612   // this and failing to remove duplicates across these two groups breaks
 613   // #include_next.
 614   unsigned NonSystemRemoved = RemoveDuplicates(SearchList, NumQuoted, Verbose);
 615   NumAngled -= NonSystemRemoved;
 616
 617   bool DontSearchCurDir = false;  // TODO: set to true if -I- is set?
 618   Headers.SetSearchPaths(SearchList, NumQuoted, NumAngled, DontSearchCurDir);
 619
 620   Headers.SetSystemHeaderPrefixes(SystemHeaderPrefixes);
 621
 622   // If verbose, print the list of directories that will be searched.
 623   if (Verbose) {
 624     llvm::errs() << "#include \"...\" search starts here:\n";
 625     for (unsigned i = 0, e = SearchList.size(); i != e; ++i) {
 626       if (i == NumQuoted)
 627         llvm::errs() << "#include <...> search starts here:\n";
 628       StringRef Name = SearchList[i].getName();
 629       const char *Suffix;
 630       if (SearchList[i].isNormalDir())
 631         Suffix = "";
 632       else if (SearchList[i].isFramework())
 633         Suffix = " (framework directory)";
 634       else {
 635         assert(SearchList[i].isHeaderMap() && "Unknown DirectoryLookup");
 636         Suffix = " (headermap)";
 637       }
 638       llvm::errs() << " " << Name << Suffix << "\n";
 639     }
 640     llvm::errs() << "End of search list.\n";
 641   }
 642 }
 643
 644 void clang::ApplyHeaderSearchOptions(HeaderSearch &HS,
 645                                      const HeaderSearchOptions &HSOpts,
 646                                      const LangOptions &Lang,
 647                                      const llvm::Triple &Triple) {
 648   InitHeaderSearch Init(HS, HSOpts.Verbose, HSOpts.Sysroot);
 649
 650   // Add the user defined entries.
 651   for (unsigned i = 0, e = HSOpts.UserEntries.size(); i != e; ++i) {
 652     const HeaderSearchOptions::Entry &E = HSOpts.UserEntries[i];
 653     if (E.IgnoreSysRoot) {
 654       Init.AddUnmappedPath(E.Path, E.Group, E.IsFramework);
 655     } else {
 656       Init.AddPath(E.Path, E.Group, E.IsFramework);
 657     }
 658   }
 659
 660   Init.AddDefaultIncludePaths(Lang, Triple, HSOpts);
 661
 662   for (unsigned i = 0, e = HSOpts.SystemHeaderPrefixes.size(); i != e; ++i)
 663     Init.AddSystemHeaderPrefix(HSOpts.SystemHeaderPrefixes[i].Prefix,
 664                                HSOpts.SystemHeaderPrefixes[i].IsSystemHeader);
 665
 666   if (HSOpts.UseBuiltinIncludes) {
 667     // Set up the builtin include directory in the module map.
 668     SmallString<128> P = StringRef(HSOpts.ResourceDir);
 669     llvm::sys::path::append(P, "include");
 670     if (const DirectoryEntry *Dir = HS.getFileMgr().getDirectory(P))
 671       HS.getModuleMap().setBuiltinIncludeDir(Dir);
 672   }
 673
 674   Init.Realize(Lang);
 675 }