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 #ifdef HAVE_CLANG_CONFIG_H
  15 # include "clang/Config/config.h"
  16 #endif
  17
  18 #include "clang/Frontend/Utils.h"
  19 #include "clang/Basic/FileManager.h"
  20 #include "clang/Basic/LangOptions.h"
  21 #include "clang/Basic/Version.h"
  22 #include "clang/Frontend/HeaderSearchOptions.h"
  23 #include "clang/Lex/HeaderSearch.h"
  24 #include "llvm/ADT/SmallString.h"
  25 #include "llvm/ADT/SmallPtrSet.h"
  26 #include "llvm/ADT/SmallVector.h"
  27 #include "llvm/ADT/StringExtras.h"
  28 #include "llvm/ADT/Triple.h"
  29 #include "llvm/ADT/Twine.h"
  30 #include "llvm/Support/raw_ostream.h"
  31 #include "llvm/Support/ErrorHandling.h"
  32 #include "llvm/Support/Path.h"
  33 #include "llvm/Config/config.h"
  34 #ifndef CLANG_PREFIX
  35 #define CLANG_PREFIX
  36 #endif
  37 using namespace clang;
  38 using namespace clang::frontend;
  39
  40 namespace {
  41
  42 /// InitHeaderSearch - This class makes it easier to set the search paths of
  43 ///  a HeaderSearch object. InitHeaderSearch stores several search path lists
  44 ///  internally, which can be sent to a HeaderSearch object in one swoop.
  45 class InitHeaderSearch {
  46   std::vector<std::pair<IncludeDirGroup, DirectoryLookup> > IncludePath;
  47   typedef std::vector<std::pair<IncludeDirGroup,
  48                       DirectoryLookup> >::const_iterator path_iterator;
  49   HeaderSearch &Headers;
  50   bool Verbose;
  51   std::string IncludeSysroot;
  52   bool IsNotEmptyOrRoot;
  53
  54 public:
  55
  56   InitHeaderSearch(HeaderSearch &HS, bool verbose, StringRef sysroot)
  57     : Headers(HS), Verbose(verbose), IncludeSysroot(sysroot),
  58       IsNotEmptyOrRoot(!(sysroot.empty() || sysroot == "/")) {
  59   }
  60
  61   /// AddPath - Add the specified path to the specified group list.
  62   void AddPath(const Twine &Path, IncludeDirGroup Group,
  63                bool isCXXAware, bool isUserSupplied,
  64                bool isFramework, bool IgnoreSysRoot = false);
  65
  66   /// AddGnuCPlusPlusIncludePaths - Add the necessary paths to support a gnu
  67   ///  libstdc++.
  68   void AddGnuCPlusPlusIncludePaths(StringRef Base,
  69                                    StringRef ArchDir,
  70                                    StringRef Dir32,
  71                                    StringRef Dir64,
  72                                    const llvm::Triple &triple);
  73
  74   /// AddMinGWCPlusPlusIncludePaths - Add the necessary paths to support a MinGW
  75   ///  libstdc++.
  76   void AddMinGWCPlusPlusIncludePaths(StringRef Base,
  77                                      StringRef Arch,
  78                                      StringRef Version);
  79
  80   /// AddMinGW64CXXPaths - Add the necessary paths to support
  81   /// libstdc++ of x86_64-w64-mingw32 aka mingw-w64.
  82   void AddMinGW64CXXPaths(StringRef Base,
  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 void InitHeaderSearch::AddPath(const Twine &Path,
 108                                IncludeDirGroup Group, bool isCXXAware,
 109                                bool isUserSupplied, bool isFramework,
 110                                bool IgnoreSysRoot) {
 111   assert(!Path.isTriviallyEmpty() && "can't handle empty path here");
 112   FileManager &FM = Headers.getFileMgr();
 113
 114   // Compute the actual path, taking into consideration -isysroot.
 115   llvm::SmallString<256> MappedPathStorage;
 116   StringRef MappedPathStr = Path.toStringRef(MappedPathStorage);
 117
 118   // Handle isysroot.
 119   if ((Group == System || Group == CXXSystem) && !IgnoreSysRoot &&
 120 #if defined(_WIN32)
 121       !MappedPathStr.empty() &&
 122       llvm::sys::path::is_separator(MappedPathStr[0]) &&
 123 #else
 124       llvm::sys::path::is_absolute(MappedPathStr) &&
 125 #endif
 126       IsNotEmptyOrRoot) {
 127     MappedPathStorage.clear();
 128     MappedPathStr =
 129       (IncludeSysroot + Path).toStringRef(MappedPathStorage);
 130   }
 131
 132   // Compute the DirectoryLookup type.
 133   SrcMgr::CharacteristicKind Type;
 134   if (Group == Quoted || Group == Angled || Group == IndexHeaderMap)
 135     Type = SrcMgr::C_User;
 136   else if (isCXXAware)
 137     Type = SrcMgr::C_System;
 138   else
 139     Type = SrcMgr::C_ExternCSystem;
 140
 141
 142   // If the directory exists, add it.
 143   if (const DirectoryEntry *DE = FM.getDirectory(MappedPathStr)) {
 144     IncludePath.push_back(std::make_pair(Group, DirectoryLookup(DE, Type,
 145                           isUserSupplied, isFramework)));
 146     return;
 147   }
 148
 149   // Check to see if this is an apple-style headermap (which are not allowed to
 150   // be frameworks).
 151   if (!isFramework) {
 152     if (const FileEntry *FE = FM.getFile(MappedPathStr)) {
 153       if (const HeaderMap *HM = Headers.CreateHeaderMap(FE)) {
 154         // It is a headermap, add it to the search path.
 155         IncludePath.push_back(std::make_pair(Group, DirectoryLookup(HM, Type,
 156                               isUserSupplied, Group == IndexHeaderMap)));
 157         return;
 158       }
 159     }
 160   }
 161
 162   if (Verbose)
 163     llvm::errs() << "ignoring nonexistent directory \""
 164                  << MappedPathStr << "\"\n";
 165 }
 166
 167 void InitHeaderSearch::AddGnuCPlusPlusIncludePaths(StringRef Base,
 168                                                    StringRef ArchDir,
 169                                                    StringRef Dir32,
 170                                                    StringRef Dir64,
 171                                                    const llvm::Triple &triple) {
 172   // Add the base dir
 173   AddPath(Base, CXXSystem, true, false, false);
 174
 175   // Add the multilib dirs
 176   llvm::Triple::ArchType arch = triple.getArch();
 177   bool is64bit = arch == llvm::Triple::ppc64 || arch == llvm::Triple::x86_64;
 178   if (is64bit)
 179     AddPath(Base + "/" + ArchDir + "/" + Dir64, CXXSystem, true, false, false);
 180   else
 181     AddPath(Base + "/" + ArchDir + "/" + Dir32, CXXSystem, true, false, false);
 182
 183   // Add the backward dir
 184   AddPath(Base + "/backward", CXXSystem, true, false, false);
 185 }
 186
 187 void InitHeaderSearch::AddMinGWCPlusPlusIncludePaths(StringRef Base,
 188                                                      StringRef Arch,
 189                                                      StringRef Version) {
 190   AddPath(Base + "/" + Arch + "/" + Version + "/include/c++",
 191           CXXSystem, true, false, false);
 192   AddPath(Base + "/" + Arch + "/" + Version + "/include/c++/" + Arch,
 193           CXXSystem, true, false, false);
 194   AddPath(Base + "/" + Arch + "/" + Version + "/include/c++/backward",
 195           CXXSystem, true, false, false);
 196 }
 197
 198 void InitHeaderSearch::AddMinGW64CXXPaths(StringRef Base,
 199                                           StringRef Version) {
 200   // Assumes Base is HeaderSearchOpts' ResourceDir
 201   AddPath(Base + "/../../../include/c++/" + Version,
 202           CXXSystem, true, false, false);
 203   AddPath(Base + "/../../../include/c++/" + Version + "/x86_64-w64-mingw32",
 204           CXXSystem, true, false, false);
 205   AddPath(Base + "/../../../include/c++/" + Version + "/i686-w64-mingw32",
 206           CXXSystem, true, false, false);
 207   AddPath(Base + "/../../../include/c++/" + Version + "/backward",
 208           CXXSystem, true, false, false);
 209 }
 210
 211 void InitHeaderSearch::AddDefaultCIncludePaths(const llvm::Triple &triple,
 212                                             const HeaderSearchOptions &HSOpts) {
 213   llvm::Triple::OSType os = triple.getOS();
 214
 215   if (HSOpts.UseStandardSystemIncludes) {
 216     switch (os) {
 217     case llvm::Triple::FreeBSD:
 218     case llvm::Triple::NetBSD:
 219       break;
 220     default:
 221       // FIXME: temporary hack: hard-coded paths.
 222       AddPath("/usr/local/include", System, true, false, false);
 223       break;
 224     }
 225   }
 226
 227   // Builtin includes use #include_next directives and should be positioned
 228   // just prior C include dirs.
 229   if (HSOpts.UseBuiltinIncludes) {
 230     // Ignore the sys root, we *always* look for clang headers relative to
 231     // supplied path.
 232     llvm::sys::Path P(HSOpts.ResourceDir);
 233     P.appendComponent("include");
 234     AddPath(P.str(), System, false, false, false, /*IgnoreSysRoot=*/ true);
 235   }
 236
 237   // All remaining additions are for system include directories, early exit if
 238   // we aren't using them.
 239   if (!HSOpts.UseStandardSystemIncludes)
 240     return;
 241
 242   // Add dirs specified via 'configure --with-c-include-dirs'.
 243   StringRef CIncludeDirs(C_INCLUDE_DIRS);
 244   if (CIncludeDirs != "") {
 245     SmallVector<StringRef, 5> dirs;
 246     CIncludeDirs.split(dirs, ":");
 247     for (SmallVectorImpl<StringRef>::iterator i = dirs.begin();
 248          i != dirs.end();
 249          ++i)
 250       AddPath(*i, System, false, false, false);
 251     return;
 252   }
 253
 254   switch (os) {
 255   case llvm::Triple::Linux:
 256   case llvm::Triple::Win32:
 257     llvm_unreachable("Include management is handled in the driver.");
 258
 259   case llvm::Triple::Haiku:
 260     AddPath("/boot/common/include", System, true, false, false);
 261     AddPath("/boot/develop/headers/os", System, true, false, false);
 262     AddPath("/boot/develop/headers/os/app", System, true, false, false);
 263     AddPath("/boot/develop/headers/os/arch", System, true, false, false);
 264     AddPath("/boot/develop/headers/os/device", System, true, false, false);
 265     AddPath("/boot/develop/headers/os/drivers", System, true, false, false);
 266     AddPath("/boot/develop/headers/os/game", System, true, false, false);
 267     AddPath("/boot/develop/headers/os/interface", System, true, false, false);
 268     AddPath("/boot/develop/headers/os/kernel", System, true, false, false);
 269     AddPath("/boot/develop/headers/os/locale", System, true, false, false);
 270     AddPath("/boot/develop/headers/os/mail", System, true, false, false);
 271     AddPath("/boot/develop/headers/os/media", System, true, false, false);
 272     AddPath("/boot/develop/headers/os/midi", System, true, false, false);
 273     AddPath("/boot/develop/headers/os/midi2", System, true, false, false);
 274     AddPath("/boot/develop/headers/os/net", System, true, false, false);
 275     AddPath("/boot/develop/headers/os/storage", System, true, false, false);
 276     AddPath("/boot/develop/headers/os/support", System, true, false, false);
 277     AddPath("/boot/develop/headers/os/translation",
 278       System, true, false, false);
 279     AddPath("/boot/develop/headers/os/add-ons/graphics",
 280       System, true, false, false);
 281     AddPath("/boot/develop/headers/os/add-ons/input_server",
 282       System, true, false, false);
 283     AddPath("/boot/develop/headers/os/add-ons/screen_saver",
 284       System, true, false, false);
 285     AddPath("/boot/develop/headers/os/add-ons/tracker",
 286       System, true, false, false);
 287     AddPath("/boot/develop/headers/os/be_apps/Deskbar",
 288       System, true, false, false);
 289     AddPath("/boot/develop/headers/os/be_apps/NetPositive",
 290       System, true, false, false);
 291     AddPath("/boot/develop/headers/os/be_apps/Tracker",
 292       System, true, false, false);
 293     AddPath("/boot/develop/headers/cpp", System, true, false, false);
 294     AddPath("/boot/develop/headers/cpp/i586-pc-haiku",
 295       System, true, false, false);
 296     AddPath("/boot/develop/headers/3rdparty", System, true, false, false);
 297     AddPath("/boot/develop/headers/bsd", System, true, false, false);
 298     AddPath("/boot/develop/headers/glibc", System, true, false, false);
 299     AddPath("/boot/develop/headers/posix", System, true, false, false);
 300     AddPath("/boot/develop/headers",  System, true, false, false);
 301     break;
 302   case llvm::Triple::RTEMS:
 303     break;
 304   case llvm::Triple::Cygwin:
 305     AddPath("/usr/include/w32api", System, true, false, false);
 306     break;
 307   case llvm::Triple::MinGW32: {
 308       // mingw-w64 crt include paths
 309       llvm::sys::Path P(HSOpts.ResourceDir);
 310       P.appendComponent("../../../i686-w64-mingw32/include"); // <sysroot>/i686-w64-mingw32/include
 311       AddPath(P.str(), System, true, false, false);
 312       P = llvm::sys::Path(HSOpts.ResourceDir);
 313       P.appendComponent("../../../x86_64-w64-mingw32/include"); // <sysroot>/x86_64-w64-mingw32/include
 314       AddPath(P.str(), System, true, false, false);
 315       // mingw.org crt include paths
 316       P = llvm::sys::Path(HSOpts.ResourceDir);
 317       P.appendComponent("../../../include"); // <sysroot>/include
 318       AddPath(P.str(), System, true, false, false);
 319       AddPath("/mingw/include", System, true, false, false);
 320       AddPath("c:/mingw/include", System, true, false, false);
 321     }
 322     break;
 323   case llvm::Triple::FreeBSD:
 324     AddPath(CLANG_PREFIX "/usr/include/clang/" CLANG_VERSION_STRING,
 325       System, false, false, false);
 326     break;
 327
 328   default:
 329     break;
 330   }
 331
 332   if ( os != llvm::Triple::RTEMS )
 333     AddPath(CLANG_PREFIX "/usr/include", System, false, false, false);
 334 }
 335
 336 void InitHeaderSearch::
 337 AddDefaultCPlusPlusIncludePaths(const llvm::Triple &triple, const HeaderSearchOptions &HSOpts) {
 338   llvm::Triple::OSType os = triple.getOS();
 339   StringRef CxxIncludeRoot(CXX_INCLUDE_ROOT);
 340   if (CxxIncludeRoot != "") {
 341     StringRef CxxIncludeArch(CXX_INCLUDE_ARCH);
 342     if (CxxIncludeArch == "")
 343       AddGnuCPlusPlusIncludePaths(CxxIncludeRoot, triple.str().c_str(),
 344                                   CXX_INCLUDE_32BIT_DIR, CXX_INCLUDE_64BIT_DIR,
 345                                   triple);
 346     else
 347       AddGnuCPlusPlusIncludePaths(CxxIncludeRoot, CXX_INCLUDE_ARCH,
 348                                   CXX_INCLUDE_32BIT_DIR, CXX_INCLUDE_64BIT_DIR,
 349                                   triple);
 350     return;
 351   }
 352   // FIXME: temporary hack: hard-coded paths.
 353
 354   if (triple.isOSDarwin()) {
 355     switch (triple.getArch()) {
 356     default: break;
 357
 358     case llvm::Triple::ppc:
 359     case llvm::Triple::ppc64:
 360       AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.2.1",
 361                                   "powerpc-apple-darwin10", "", "ppc64",
 362                                   triple);
 363       AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.0.0",
 364                                   "powerpc-apple-darwin10", "", "ppc64",
 365                                   triple);
 366       break;
 367
 368     case llvm::Triple::x86:
 369     case llvm::Triple::x86_64:
 370       AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.2.1",
 371                                   "i686-apple-darwin10", "", "x86_64", triple);
 372       AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.0.0",
 373                                   "i686-apple-darwin8", "", "", triple);
 374       break;
 375
 376     case llvm::Triple::arm:
 377     case llvm::Triple::thumb:
 378       AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.2.1",
 379                                   "arm-apple-darwin10", "v7", "", triple);
 380       AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.2.1",
 381                                   "arm-apple-darwin10", "v6", "", triple);
 382       break;
 383     }
 384     return;
 385   }
 386
 387   switch (os) {
 388   case llvm::Triple::Linux:
 389   case llvm::Triple::Win32:
 390     llvm_unreachable("Include management is handled in the driver.");
 391
 392   case llvm::Triple::Cygwin:
 393     // Cygwin-1.7
 394     AddMinGWCPlusPlusIncludePaths("/usr/lib/gcc", "i686-pc-cygwin", "4.3.4");
 395     // g++-4 / Cygwin-1.5
 396     AddMinGWCPlusPlusIncludePaths("/usr/lib/gcc", "i686-pc-cygwin", "4.3.2");
 397     // FIXME: Do we support g++-3.4.4?
 398     AddMinGWCPlusPlusIncludePaths("/usr/lib/gcc", "i686-pc-cygwin", "3.4.4");
 399     break;
 400   case llvm::Triple::MinGW32:
 401     // mingw-w64 C++ include paths (i686-w64-mingw32 and x86_64-w64-mingw32)
 402     AddMinGW64CXXPaths(HSOpts.ResourceDir, "4.5.0");
 403     AddMinGW64CXXPaths(HSOpts.ResourceDir, "4.5.1");
 404     AddMinGW64CXXPaths(HSOpts.ResourceDir, "4.5.2");
 405     AddMinGW64CXXPaths(HSOpts.ResourceDir, "4.5.3");
 406     AddMinGW64CXXPaths(HSOpts.ResourceDir, "4.6.0");
 407     AddMinGW64CXXPaths(HSOpts.ResourceDir, "4.6.1");
 408     AddMinGW64CXXPaths(HSOpts.ResourceDir, "4.6.2");
 409     AddMinGW64CXXPaths(HSOpts.ResourceDir, "4.7.0");
 410     // mingw.org C++ include paths
 411     AddMinGWCPlusPlusIncludePaths("/mingw/lib/gcc", "mingw32", "4.5.2"); //MSYS
 412     AddMinGWCPlusPlusIncludePaths("c:/MinGW/lib/gcc", "mingw32", "4.5.0");
 413     AddMinGWCPlusPlusIncludePaths("c:/MinGW/lib/gcc", "mingw32", "4.4.0");
 414     AddMinGWCPlusPlusIncludePaths("c:/MinGW/lib/gcc", "mingw32", "4.3.0");
 415     break;
 416   case llvm::Triple::DragonFly:
 417     AddPath("/usr/include/c++/4.1", CXXSystem, true, false, false);
 418     break;
 419   case llvm::Triple::FreeBSD:
 420     // FreeBSD 8.0
 421     // FreeBSD 7.3
 422     AddGnuCPlusPlusIncludePaths(CLANG_PREFIX "/usr/include/c++/4.2",
 423                                 "", "", "", triple);
 424     AddGnuCPlusPlusIncludePaths(CLANG_PREFIX "/usr/include/c++/4.2/backward",
 425                                 "", "", "", triple);
 426     break;
 427   case llvm::Triple::NetBSD:
 428     AddGnuCPlusPlusIncludePaths("/usr/include/g++", "", "", "", triple);
 429     break;
 430   case llvm::Triple::OpenBSD: {
 431     std::string t = triple.getTriple();
 432     if (t.substr(0, 6) == "x86_64")
 433       t.replace(0, 6, "amd64");
 434     AddGnuCPlusPlusIncludePaths("/usr/include/g++",
 435                                 t, "", "", triple);
 436     break;
 437   }
 438   case llvm::Triple::Minix:
 439     AddGnuCPlusPlusIncludePaths("/usr/gnu/include/c++/4.4.3",
 440                                 "", "", "", triple);
 441     break;
 442   case llvm::Triple::Solaris:
 443     // Solaris - Fall though..
 444   case llvm::Triple::AuroraUX:
 445     // AuroraUX
 446     AddGnuCPlusPlusIncludePaths("/opt/gcc4/include/c++/4.2.4",
 447                                 "i386-pc-solaris2.11", "", "", triple);
 448     break;
 449   default:
 450     break;
 451   }
 452 }
 453
 454 void InitHeaderSearch::AddDefaultIncludePaths(const LangOptions &Lang,
 455                                               const llvm::Triple &triple,
 456                                             const HeaderSearchOptions &HSOpts) {
 457   // NB: This code path is going away. All of the logic is moving into the
 458   // driver which has the information necessary to do target-specific
 459   // selections of default include paths. Each target which moves there will be
 460   // exempted from this logic here until we can delete the entire pile of code.
 461   switch (triple.getOS()) {
 462   default:
 463     break; // Everything else continues to use this routine's logic.
 464
 465   case llvm::Triple::Linux:
 466   case llvm::Triple::Win32:
 467     return;
 468   }
 469
 470   if (Lang.CPlusPlus && HSOpts.UseStandardCXXIncludes &&
 471       HSOpts.UseStandardSystemIncludes) {
 472     if (HSOpts.UseLibcxx) {
 473       if (triple.isOSDarwin()) {
 474         // On Darwin, libc++ may be installed alongside the compiler in
 475         // lib/c++/v1.
 476         llvm::sys::Path P(HSOpts.ResourceDir);
 477         if (!P.isEmpty()) {
 478           P.eraseComponent();  // Remove version from foo/lib/clang/version
 479           P.eraseComponent();  // Remove clang from foo/lib/clang
 480
 481           // Get foo/lib/c++/v1
 482           P.appendComponent("c++");
 483           P.appendComponent("v1");
 484           AddPath(P.str(), CXXSystem, true, false, false, true);
 485         }
 486       }
 487
 488       AddPath("/usr/include/c++/v1", CXXSystem, true, false, false);
 489     } else {
 490       AddDefaultCPlusPlusIncludePaths(triple, HSOpts);
 491     }
 492   }
 493
 494   AddDefaultCIncludePaths(triple, HSOpts);
 495
 496   // Add the default framework include paths on Darwin.
 497   if (HSOpts.UseStandardSystemIncludes) {
 498     if (triple.isOSDarwin()) {
 499       AddPath("/System/Library/Frameworks", System, true, false, true);
 500       AddPath("/Library/Frameworks", System, true, false, true);
 501     }
 502   }
 503 }
 504
 505 /// RemoveDuplicates - If there are duplicate directory entries in the specified
 506 /// search list, remove the later (dead) ones.  Returns the number of non-system
 507 /// headers removed, which is used to update NumAngled.
 508 static unsigned RemoveDuplicates(std::vector<DirectoryLookup> &SearchList,
 509                                  unsigned First, bool Verbose) {
 510   llvm::SmallPtrSet<const DirectoryEntry *, 8> SeenDirs;
 511   llvm::SmallPtrSet<const DirectoryEntry *, 8> SeenFrameworkDirs;
 512   llvm::SmallPtrSet<const HeaderMap *, 8> SeenHeaderMaps;
 513   unsigned NonSystemRemoved = 0;
 514   for (unsigned i = First; i != SearchList.size(); ++i) {
 515     unsigned DirToRemove = i;
 516
 517     const DirectoryLookup &CurEntry = SearchList[i];
 518
 519     if (CurEntry.isNormalDir()) {
 520       // If this isn't the first time we've seen this dir, remove it.
 521       if (SeenDirs.insert(CurEntry.getDir()))
 522         continue;
 523     } else if (CurEntry.isFramework()) {
 524       // If this isn't the first time we've seen this framework dir, remove it.
 525       if (SeenFrameworkDirs.insert(CurEntry.getFrameworkDir()))
 526         continue;
 527     } else {
 528       assert(CurEntry.isHeaderMap() && "Not a headermap or normal dir?");
 529       // If this isn't the first time we've seen this headermap, remove it.
 530       if (SeenHeaderMaps.insert(CurEntry.getHeaderMap()))
 531         continue;
 532     }
 533
 534     // If we have a normal #include dir/framework/headermap that is shadowed
 535     // later in the chain by a system include location, we actually want to
 536     // ignore the user's request and drop the user dir... keeping the system
 537     // dir.  This is weird, but required to emulate GCC's search path correctly.
 538     //
 539     // Since dupes of system dirs are rare, just rescan to find the original
 540     // that we're nuking instead of using a DenseMap.
 541     if (CurEntry.getDirCharacteristic() != SrcMgr::C_User) {
 542       // Find the dir that this is the same of.
 543       unsigned FirstDir;
 544       for (FirstDir = 0; ; ++FirstDir) {
 545         assert(FirstDir != i && "Didn't find dupe?");
 546
 547         const DirectoryLookup &SearchEntry = SearchList[FirstDir];
 548
 549         // If these are different lookup types, then they can't be the dupe.
 550         if (SearchEntry.getLookupType() != CurEntry.getLookupType())
 551           continue;
 552
 553         bool isSame;
 554         if (CurEntry.isNormalDir())
 555           isSame = SearchEntry.getDir() == CurEntry.getDir();
 556         else if (CurEntry.isFramework())
 557           isSame = SearchEntry.getFrameworkDir() == CurEntry.getFrameworkDir();
 558         else {
 559           assert(CurEntry.isHeaderMap() && "Not a headermap or normal dir?");
 560           isSame = SearchEntry.getHeaderMap() == CurEntry.getHeaderMap();
 561         }
 562
 563         if (isSame)
 564           break;
 565       }
 566
 567       // If the first dir in the search path is a non-system dir, zap it
 568       // instead of the system one.
 569       if (SearchList[FirstDir].getDirCharacteristic() == SrcMgr::C_User)
 570         DirToRemove = FirstDir;
 571     }
 572
 573     if (Verbose) {
 574       llvm::errs() << "ignoring duplicate directory \""
 575                    << CurEntry.getName() << "\"\n";
 576       if (DirToRemove != i)
 577         llvm::errs() << "  as it is a non-system directory that duplicates "
 578                      << "a system directory\n";
 579     }
 580     if (DirToRemove != i)
 581       ++NonSystemRemoved;
 582
 583     // This is reached if the current entry is a duplicate.  Remove the
 584     // DirToRemove (usually the current dir).
 585     SearchList.erase(SearchList.begin()+DirToRemove);
 586     --i;
 587   }
 588   return NonSystemRemoved;
 589 }
 590
 591
 592 void InitHeaderSearch::Realize(const LangOptions &Lang) {
 593   // Concatenate ANGLE+SYSTEM+AFTER chains together into SearchList.
 594   std::vector<DirectoryLookup> SearchList;
 595   SearchList.reserve(IncludePath.size());
 596
 597   // Quoted arguments go first.
 598   for (path_iterator it = IncludePath.begin(), ie = IncludePath.end();
 599        it != ie; ++it) {
 600     if (it->first == Quoted)
 601       SearchList.push_back(it->second);
 602   }
 603   // Deduplicate and remember index.
 604   RemoveDuplicates(SearchList, 0, Verbose);
 605   unsigned NumQuoted = SearchList.size();
 606
 607   for (path_iterator it = IncludePath.begin(), ie = IncludePath.end();
 608        it != ie; ++it) {
 609     if (it->first == Angled || it->first == IndexHeaderMap)
 610       SearchList.push_back(it->second);
 611   }
 612
 613   RemoveDuplicates(SearchList, NumQuoted, Verbose);
 614   unsigned NumAngled = SearchList.size();
 615
 616   for (path_iterator it = IncludePath.begin(), ie = IncludePath.end();
 617        it != ie; ++it) {
 618     if (it->first == System ||
 619         (!Lang.ObjC1 && !Lang.CPlusPlus && it->first == CSystem)    ||
 620         (/*FIXME !Lang.ObjC1 && */Lang.CPlusPlus  && it->first == CXXSystem)  ||
 621         (Lang.ObjC1  && !Lang.CPlusPlus && it->first == ObjCSystem) ||
 622         (Lang.ObjC1  && Lang.CPlusPlus  && it->first == ObjCXXSystem))
 623       SearchList.push_back(it->second);
 624   }
 625
 626   for (path_iterator it = IncludePath.begin(), ie = IncludePath.end();
 627        it != ie; ++it) {
 628     if (it->first == After)
 629       SearchList.push_back(it->second);
 630   }
 631
 632   // Remove duplicates across both the Angled and System directories.  GCC does
 633   // this and failing to remove duplicates across these two groups breaks
 634   // #include_next.
 635   unsigned NonSystemRemoved = RemoveDuplicates(SearchList, NumQuoted, Verbose);
 636   NumAngled -= NonSystemRemoved;
 637
 638   bool DontSearchCurDir = false;  // TODO: set to true if -I- is set?
 639   Headers.SetSearchPaths(SearchList, NumQuoted, NumAngled, DontSearchCurDir);
 640
 641   // If verbose, print the list of directories that will be searched.
 642   if (Verbose) {
 643     llvm::errs() << "#include \"...\" search starts here:\n";
 644     for (unsigned i = 0, e = SearchList.size(); i != e; ++i) {
 645       if (i == NumQuoted)
 646         llvm::errs() << "#include <...> search starts here:\n";
 647       const char *Name = SearchList[i].getName();
 648       const char *Suffix;
 649       if (SearchList[i].isNormalDir())
 650         Suffix = "";
 651       else if (SearchList[i].isFramework())
 652         Suffix = " (framework directory)";
 653       else {
 654         assert(SearchList[i].isHeaderMap() && "Unknown DirectoryLookup");
 655         Suffix = " (headermap)";
 656       }
 657       llvm::errs() << " " << Name << Suffix << "\n";
 658     }
 659     llvm::errs() << "End of search list.\n";
 660   }
 661 }
 662
 663 void clang::ApplyHeaderSearchOptions(HeaderSearch &HS,
 664                                      const HeaderSearchOptions &HSOpts,
 665                                      const LangOptions &Lang,
 666                                      const llvm::Triple &Triple) {
 667   InitHeaderSearch Init(HS, HSOpts.Verbose, HSOpts.Sysroot);
 668
 669   // Add the user defined entries.
 670   for (unsigned i = 0, e = HSOpts.UserEntries.size(); i != e; ++i) {
 671     const HeaderSearchOptions::Entry &E = HSOpts.UserEntries[i];
 672     Init.AddPath(E.Path, E.Group, !E.ImplicitExternC, E.IsUserSupplied,
 673                  E.IsFramework, E.IgnoreSysRoot);
 674   }
 675
 676   Init.AddDefaultIncludePaths(Lang, Triple, HSOpts);
 677
 678   Init.Realize(Lang);
 679 }