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/HeaderSearch.h"
  19 #include "clang/Lex/HeaderSearchOptions.h"
  20 #include "llvm/ADT/SmallPtrSet.h"
  21 #include "llvm/ADT/SmallString.h"
  22 #include "llvm/ADT/SmallVector.h"
  23 #include "llvm/ADT/StringExtras.h"
  24 #include "llvm/ADT/Triple.h"
  25 #include "llvm/ADT/Twine.h"
  26 #include "llvm/Support/ErrorHandling.h"
  27 #include "llvm/Support/FileSystem.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.push_back(std::make_pair(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   /// AddMinGW64CXXPaths - Add the necessary paths to support
  86   /// libstdc++ of x86_64-w64-mingw32 aka mingw-w64.
  87   void AddMinGW64CXXPaths(StringRef Base,
  88                           StringRef Version);
  89
  90   // AddDefaultCIncludePaths - Add paths that should always be searched.
  91   void AddDefaultCIncludePaths(const llvm::Triple &triple,
  92                                const HeaderSearchOptions &HSOpts);
  93
  94   // AddDefaultCPlusPlusIncludePaths -  Add paths that should be searched when
  95   //  compiling c++.
  96   void AddDefaultCPlusPlusIncludePaths(const llvm::Triple &triple,
  97                                        const HeaderSearchOptions &HSOpts);
  98
  99   /// AddDefaultSystemIncludePaths - Adds the default system include paths so
 100   ///  that e.g. stdio.h is found.
 101   void AddDefaultIncludePaths(const LangOptions &Lang,
 102                               const llvm::Triple &triple,
 103                               const HeaderSearchOptions &HSOpts);
 104
 105   /// Realize - Merges all search path lists into one list and send it to
 106   /// HeaderSearch.
 107   void Realize(const LangOptions &Lang);
 108 };
 109
 110 }  // end anonymous namespace.
 111
 112 static bool CanPrefixSysroot(StringRef Path) {
 113 #if defined(LLVM_ON_WIN32)
 114   return !Path.empty() && llvm::sys::path::is_separator(Path[0]);
 115 #else
 116   return llvm::sys::path::is_absolute(Path);
 117 #endif
 118 }
 119
 120 void InitHeaderSearch::AddPath(const Twine &Path, IncludeDirGroup Group,
 121                                bool isFramework) {
 122   // Add the path with sysroot prepended, if desired and this is a system header
 123   // group.
 124   if (HasSysroot) {
 125     SmallString<256> MappedPathStorage;
 126     StringRef MappedPathStr = Path.toStringRef(MappedPathStorage);
 127     if (CanPrefixSysroot(MappedPathStr)) {
 128       AddUnmappedPath(IncludeSysroot + Path, Group, isFramework);
 129       return;
 130     }
 131   }
 132
 133   AddUnmappedPath(Path, Group, isFramework);
 134 }
 135
 136 void InitHeaderSearch::AddUnmappedPath(const Twine &Path, IncludeDirGroup Group,
 137                                        bool isFramework) {
 138   assert(!Path.isTriviallyEmpty() && "can't handle empty path here");
 139
 140   FileManager &FM = Headers.getFileMgr();
 141   SmallString<256> MappedPathStorage;
 142   StringRef MappedPathStr = Path.toStringRef(MappedPathStorage);
 143
 144   // Compute the DirectoryLookup type.
 145   SrcMgr::CharacteristicKind Type;
 146   if (Group == Quoted || Group == Angled || Group == IndexHeaderMap) {
 147     Type = SrcMgr::C_User;
 148   } else if (Group == ExternCSystem) {
 149     Type = SrcMgr::C_ExternCSystem;
 150   } else {
 151     Type = SrcMgr::C_System;
 152   }
 153
 154   // If the directory exists, add it.
 155   if (const DirectoryEntry *DE = FM.getDirectory(MappedPathStr)) {
 156     IncludePath.push_back(
 157       std::make_pair(Group, DirectoryLookup(DE, Type, isFramework)));
 158     return;
 159   }
 160
 161   // Check to see if this is an apple-style headermap (which are not allowed to
 162   // be frameworks).
 163   if (!isFramework) {
 164     if (const FileEntry *FE = FM.getFile(MappedPathStr)) {
 165       if (const HeaderMap *HM = Headers.CreateHeaderMap(FE)) {
 166         // It is a headermap, add it to the search path.
 167         IncludePath.push_back(
 168           std::make_pair(Group,
 169                          DirectoryLookup(HM, Type, Group == IndexHeaderMap)));
 170         return;
 171       }
 172     }
 173   }
 174
 175   if (Verbose)
 176     llvm::errs() << "ignoring nonexistent directory \""
 177                  << MappedPathStr << "\"\n";
 178 }
 179
 180 void InitHeaderSearch::AddGnuCPlusPlusIncludePaths(StringRef Base,
 181                                                    StringRef ArchDir,
 182                                                    StringRef Dir32,
 183                                                    StringRef Dir64,
 184                                                    const llvm::Triple &triple) {
 185   // Add the base dir
 186   AddPath(Base, CXXSystem, false);
 187
 188   // Add the multilib dirs
 189   llvm::Triple::ArchType arch = triple.getArch();
 190   bool is64bit = arch == llvm::Triple::ppc64 || arch == llvm::Triple::x86_64;
 191   if (is64bit)
 192     AddPath(Base + "/" + ArchDir + "/" + Dir64, CXXSystem, false);
 193   else
 194     AddPath(Base + "/" + ArchDir + "/" + Dir32, CXXSystem, false);
 195
 196   // Add the backward dir
 197   AddPath(Base + "/backward", CXXSystem, false);
 198 }
 199
 200 void InitHeaderSearch::AddMinGWCPlusPlusIncludePaths(StringRef Base,
 201                                                      StringRef Arch,
 202                                                      StringRef Version) {
 203   AddPath(Base + "/" + Arch + "/" + Version + "/include/c++",
 204           CXXSystem, false);
 205   AddPath(Base + "/" + Arch + "/" + Version + "/include/c++/" + Arch,
 206           CXXSystem, false);
 207   AddPath(Base + "/" + Arch + "/" + Version + "/include/c++/backward",
 208           CXXSystem, false);
 209 }
 210
 211 void InitHeaderSearch::AddMinGW64CXXPaths(StringRef Base,
 212                                           StringRef Version) {
 213   // Assumes Base is HeaderSearchOpts' ResourceDir
 214   AddPath(Base + "/../../../include/c++/" + Version,
 215           CXXSystem, false);
 216   AddPath(Base + "/../../../include/c++/" + Version + "/x86_64-w64-mingw32",
 217           CXXSystem, false);
 218   AddPath(Base + "/../../../include/c++/" + Version + "/i686-w64-mingw32",
 219           CXXSystem, false);
 220   AddPath(Base + "/../../../include/c++/" + Version + "/backward",
 221           CXXSystem, false);
 222 }
 223
 224 void InitHeaderSearch::AddDefaultCIncludePaths(const llvm::Triple &triple,
 225                                             const HeaderSearchOptions &HSOpts) {
 226   llvm::Triple::OSType os = triple.getOS();
 227
 228   if (HSOpts.UseStandardSystemIncludes) {
 229     switch (os) {
 230     case llvm::Triple::CloudABI:
 231     case llvm::Triple::FreeBSD:
 232     case llvm::Triple::NetBSD:
 233     case llvm::Triple::OpenBSD:
 234     case llvm::Triple::Bitrig:
 235     case llvm::Triple::NaCl:
 236       break;
 237     default:
 238       // FIXME: temporary hack: hard-coded paths.
 239       AddPath("/usr/local/include", System, false);
 240       break;
 241     }
 242   }
 243
 244   // Builtin includes use #include_next directives and should be positioned
 245   // just prior C include dirs.
 246   if (HSOpts.UseBuiltinIncludes) {
 247     // Ignore the sys root, we *always* look for clang headers relative to
 248     // supplied path.
 249     SmallString<128> P = StringRef(HSOpts.ResourceDir);
 250     llvm::sys::path::append(P, "include");
 251     AddUnmappedPath(P, ExternCSystem, false);
 252   }
 253
 254   // All remaining additions are for system include directories, early exit if
 255   // we aren't using them.
 256   if (!HSOpts.UseStandardSystemIncludes)
 257     return;
 258
 259   // Add dirs specified via 'configure --with-c-include-dirs'.
 260   StringRef CIncludeDirs(C_INCLUDE_DIRS);
 261   if (CIncludeDirs != "") {
 262     SmallVector<StringRef, 5> dirs;
 263     CIncludeDirs.split(dirs, ":");
 264     for (SmallVectorImpl<StringRef>::iterator i = dirs.begin();
 265          i != dirs.end();
 266          ++i)
 267       AddPath(*i, ExternCSystem, false);
 268     return;
 269   }
 270
 271   switch (os) {
 272   case llvm::Triple::Linux:
 273     llvm_unreachable("Include management is handled in the driver.");
 274
 275   case llvm::Triple::CloudABI: {
 276     // <sysroot>/<triple>/include
 277     SmallString<128> P = StringRef(HSOpts.ResourceDir);
 278     llvm::sys::path::append(P, "../../..", triple.str(), "include");
 279     AddPath(P, System, false);
 280     break;
 281   }
 282
 283   case llvm::Triple::Haiku:
 284     AddPath("/boot/common/include", System, false);
 285     AddPath("/boot/develop/headers/os", System, false);
 286     AddPath("/boot/develop/headers/os/app", System, false);
 287     AddPath("/boot/develop/headers/os/arch", System, false);
 288     AddPath("/boot/develop/headers/os/device", System, false);
 289     AddPath("/boot/develop/headers/os/drivers", System, false);
 290     AddPath("/boot/develop/headers/os/game", System, false);
 291     AddPath("/boot/develop/headers/os/interface", System, false);
 292     AddPath("/boot/develop/headers/os/kernel", System, false);
 293     AddPath("/boot/develop/headers/os/locale", System, false);
 294     AddPath("/boot/develop/headers/os/mail", System, false);
 295     AddPath("/boot/develop/headers/os/media", System, false);
 296     AddPath("/boot/develop/headers/os/midi", System, false);
 297     AddPath("/boot/develop/headers/os/midi2", System, false);
 298     AddPath("/boot/develop/headers/os/net", System, false);
 299     AddPath("/boot/develop/headers/os/storage", System, false);
 300     AddPath("/boot/develop/headers/os/support", System, false);
 301     AddPath("/boot/develop/headers/os/translation", System, false);
 302     AddPath("/boot/develop/headers/os/add-ons/graphics", System, false);
 303     AddPath("/boot/develop/headers/os/add-ons/input_server", System, false);
 304     AddPath("/boot/develop/headers/os/add-ons/screen_saver", System, false);
 305     AddPath("/boot/develop/headers/os/add-ons/tracker", System, false);
 306     AddPath("/boot/develop/headers/os/be_apps/Deskbar", System, false);
 307     AddPath("/boot/develop/headers/os/be_apps/NetPositive", System, false);
 308     AddPath("/boot/develop/headers/os/be_apps/Tracker", System, false);
 309     AddPath("/boot/develop/headers/cpp", System, false);
 310     AddPath("/boot/develop/headers/cpp/i586-pc-haiku", System, false);
 311     AddPath("/boot/develop/headers/3rdparty", System, false);
 312     AddPath("/boot/develop/headers/bsd", System, false);
 313     AddPath("/boot/develop/headers/glibc", System, false);
 314     AddPath("/boot/develop/headers/posix", System, false);
 315     AddPath("/boot/develop/headers",  System, false);
 316     break;
 317   case llvm::Triple::RTEMS:
 318     break;
 319   case llvm::Triple::Win32:
 320     switch (triple.getEnvironment()) {
 321     default: llvm_unreachable("Include management is handled in the driver.");
 322     case llvm::Triple::Cygnus:
 323       AddPath("/usr/include/w32api", System, false);
 324       break;
 325     case llvm::Triple::GNU:
 326       // mingw-w64 crt include paths
 327       // <sysroot>/i686-w64-mingw32/include
 328       SmallString<128> P = StringRef(HSOpts.ResourceDir);
 329       llvm::sys::path::append(P, "../../../i686-w64-mingw32/include");
 330       AddPath(P, System, false);
 331
 332       // <sysroot>/x86_64-w64-mingw32/include
 333       P.resize(HSOpts.ResourceDir.size());
 334       llvm::sys::path::append(P, "../../../x86_64-w64-mingw32/include");
 335       AddPath(P, System, false);
 336
 337       // mingw.org crt include paths
 338       // <sysroot>/include
 339       P.resize(HSOpts.ResourceDir.size());
 340       llvm::sys::path::append(P, "../../../include");
 341       AddPath(P, System, false);
 342       AddPath("/mingw/include", System, false);
 343 #if defined(LLVM_ON_WIN32)
 344       AddPath("c:/mingw/include", System, false);
 345 #endif
 346       break;
 347     }
 348     break;
 349   default:
 350     break;
 351   }
 352
 353   switch (os) {
 354   case llvm::Triple::CloudABI:
 355   case llvm::Triple::RTEMS:
 356   case llvm::Triple::NaCl:
 357     break;
 358   default:
 359     AddPath("/usr/include", ExternCSystem, false);
 360     break;
 361   }
 362 }
 363
 364 void InitHeaderSearch::
 365 AddDefaultCPlusPlusIncludePaths(const llvm::Triple &triple, const HeaderSearchOptions &HSOpts) {
 366   llvm::Triple::OSType os = triple.getOS();
 367   // FIXME: temporary hack: hard-coded paths.
 368
 369   if (triple.isOSDarwin()) {
 370     switch (triple.getArch()) {
 371     default: break;
 372
 373     case llvm::Triple::ppc:
 374     case llvm::Triple::ppc64:
 375       AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.2.1",
 376                                   "powerpc-apple-darwin10", "", "ppc64",
 377                                   triple);
 378       AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.0.0",
 379                                   "powerpc-apple-darwin10", "", "ppc64",
 380                                   triple);
 381       break;
 382
 383     case llvm::Triple::x86:
 384     case llvm::Triple::x86_64:
 385       AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.2.1",
 386                                   "i686-apple-darwin10", "", "x86_64", triple);
 387       AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.0.0",
 388                                   "i686-apple-darwin8", "", "", triple);
 389       break;
 390
 391     case llvm::Triple::arm:
 392     case llvm::Triple::thumb:
 393       AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.2.1",
 394                                   "arm-apple-darwin10", "v7", "", triple);
 395       AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.2.1",
 396                                   "arm-apple-darwin10", "v6", "", triple);
 397       break;
 398
 399     case llvm::Triple::aarch64:
 400       AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.2.1",
 401                                   "arm64-apple-darwin10", "", "", triple);
 402       break;
 403     }
 404     return;
 405   }
 406
 407   switch (os) {
 408   case llvm::Triple::Linux:
 409     llvm_unreachable("Include management is handled in the driver.");
 410     break;
 411   case llvm::Triple::Win32:
 412     switch (triple.getEnvironment()) {
 413     default: llvm_unreachable("Include management is handled in the driver.");
 414     case llvm::Triple::Cygnus:
 415       // Cygwin-1.7
 416       AddMinGWCPlusPlusIncludePaths("/usr/lib/gcc", "i686-pc-cygwin", "4.7.3");
 417       AddMinGWCPlusPlusIncludePaths("/usr/lib/gcc", "i686-pc-cygwin", "4.5.3");
 418       AddMinGWCPlusPlusIncludePaths("/usr/lib/gcc", "i686-pc-cygwin", "4.3.4");
 419       // g++-4 / Cygwin-1.5
 420       AddMinGWCPlusPlusIncludePaths("/usr/lib/gcc", "i686-pc-cygwin", "4.3.2");
 421       break;
 422     case llvm::Triple::GNU:
 423       // mingw-w64 C++ include paths (i686-w64-mingw32 and x86_64-w64-mingw32)
 424       AddMinGW64CXXPaths(HSOpts.ResourceDir, "4.7.0");
 425       AddMinGW64CXXPaths(HSOpts.ResourceDir, "4.7.1");
 426       AddMinGW64CXXPaths(HSOpts.ResourceDir, "4.7.2");
 427       AddMinGW64CXXPaths(HSOpts.ResourceDir, "4.7.3");
 428       AddMinGW64CXXPaths(HSOpts.ResourceDir, "4.8.0");
 429       AddMinGW64CXXPaths(HSOpts.ResourceDir, "4.8.1");
 430       AddMinGW64CXXPaths(HSOpts.ResourceDir, "4.8.2");
 431       // mingw.org C++ include paths
 432 #if defined(LLVM_ON_WIN32)
 433       AddMinGWCPlusPlusIncludePaths("c:/MinGW/lib/gcc", "mingw32", "4.7.0");
 434       AddMinGWCPlusPlusIncludePaths("c:/MinGW/lib/gcc", "mingw32", "4.7.1");
 435       AddMinGWCPlusPlusIncludePaths("c:/MinGW/lib/gcc", "mingw32", "4.7.2");
 436       AddMinGWCPlusPlusIncludePaths("c:/MinGW/lib/gcc", "mingw32", "4.7.3");
 437       AddMinGWCPlusPlusIncludePaths("c:/MinGW/lib/gcc", "mingw32", "4.8.0");
 438       AddMinGWCPlusPlusIncludePaths("c:/MinGW/lib/gcc", "mingw32", "4.8.1");
 439       AddMinGWCPlusPlusIncludePaths("c:/MinGW/lib/gcc", "mingw32", "4.8.2");
 440 #endif
 441       break;
 442     }
 443   case llvm::Triple::DragonFly:
 444     if (llvm::sys::fs::exists("/usr/lib/gcc47"))
 445       AddPath("/usr/include/c++/4.7", CXXSystem, false);
 446     else
 447       AddPath("/usr/include/c++/4.4", CXXSystem, false);
 448     break;
 449   case llvm::Triple::OpenBSD: {
 450     std::string t = triple.getTriple();
 451     if (t.substr(0, 6) == "x86_64")
 452       t.replace(0, 6, "amd64");
 453     AddGnuCPlusPlusIncludePaths("/usr/include/g++",
 454                                 t, "", "", triple);
 455     break;
 456   }
 457   case llvm::Triple::Minix:
 458     AddGnuCPlusPlusIncludePaths("/usr/gnu/include/c++/4.4.3",
 459                                 "", "", "", triple);
 460     break;
 461   case llvm::Triple::Solaris:
 462     AddGnuCPlusPlusIncludePaths("/usr/gcc/4.5/include/c++/4.5.2/",
 463                                 "i386-pc-solaris2.11", "", "", triple);
 464     break;
 465   default:
 466     break;
 467   }
 468 }
 469
 470 void InitHeaderSearch::AddDefaultIncludePaths(const LangOptions &Lang,
 471                                               const llvm::Triple &triple,
 472                                             const HeaderSearchOptions &HSOpts) {
 473   // NB: This code path is going away. All of the logic is moving into the
 474   // driver which has the information necessary to do target-specific
 475   // selections of default include paths. Each target which moves there will be
 476   // exempted from this logic here until we can delete the entire pile of code.
 477   switch (triple.getOS()) {
 478   default:
 479     break; // Everything else continues to use this routine's logic.
 480
 481   case llvm::Triple::Linux:
 482     return;
 483
 484   case llvm::Triple::Win32:
 485     if (triple.getEnvironment() == llvm::Triple::MSVC ||
 486         triple.getEnvironment() == llvm::Triple::Itanium ||
 487         triple.isOSBinFormatMachO())
 488       return;
 489     break;
 490   }
 491
 492   if (Lang.CPlusPlus && HSOpts.UseStandardCXXIncludes &&
 493       HSOpts.UseStandardSystemIncludes) {
 494     if (HSOpts.UseLibcxx) {
 495       if (triple.isOSDarwin()) {
 496         // On Darwin, libc++ may be installed alongside the compiler in
 497         // include/c++/v1.
 498         if (!HSOpts.ResourceDir.empty()) {
 499           // Remove version from foo/lib/clang/version
 500           StringRef NoVer = llvm::sys::path::parent_path(HSOpts.ResourceDir);
 501           // Remove clang from foo/lib/clang
 502           StringRef Lib = llvm::sys::path::parent_path(NoVer);
 503           // Remove lib from foo/lib
 504           SmallString<128> P = llvm::sys::path::parent_path(Lib);
 505
 506           // Get foo/include/c++/v1
 507           llvm::sys::path::append(P, "include", "c++", "v1");
 508           AddUnmappedPath(P, CXXSystem, false);
 509         }
 510       }
 511       // On Solaris, include the support directory for things like xlocale and
 512       // fudged system headers.
 513       if (triple.getOS() == llvm::Triple::Solaris)
 514         AddPath("/usr/include/c++/v1/support/solaris", CXXSystem, false);
 515
 516       AddPath("/usr/include/c++/v1", CXXSystem, false);
 517     } else {
 518       AddDefaultCPlusPlusIncludePaths(triple, HSOpts);
 519     }
 520   }
 521
 522   AddDefaultCIncludePaths(triple, HSOpts);
 523
 524   // Add the default framework include paths on Darwin.
 525   if (HSOpts.UseStandardSystemIncludes) {
 526     if (triple.isOSDarwin()) {
 527       AddPath("/System/Library/Frameworks", System, true);
 528       AddPath("/Library/Frameworks", System, true);
 529     }
 530   }
 531 }
 532
 533 /// RemoveDuplicates - If there are duplicate directory entries in the specified
 534 /// search list, remove the later (dead) ones.  Returns the number of non-system
 535 /// headers removed, which is used to update NumAngled.
 536 static unsigned RemoveDuplicates(std::vector<DirectoryLookup> &SearchList,
 537                                  unsigned First, bool Verbose) {
 538   llvm::SmallPtrSet<const DirectoryEntry *, 8> SeenDirs;
 539   llvm::SmallPtrSet<const DirectoryEntry *, 8> SeenFrameworkDirs;
 540   llvm::SmallPtrSet<const HeaderMap *, 8> SeenHeaderMaps;
 541   unsigned NonSystemRemoved = 0;
 542   for (unsigned i = First; i != SearchList.size(); ++i) {
 543     unsigned DirToRemove = i;
 544
 545     const DirectoryLookup &CurEntry = SearchList[i];
 546
 547     if (CurEntry.isNormalDir()) {
 548       // If this isn't the first time we've seen this dir, remove it.
 549       if (SeenDirs.insert(CurEntry.getDir()).second)
 550         continue;
 551     } else if (CurEntry.isFramework()) {
 552       // If this isn't the first time we've seen this framework dir, remove it.
 553       if (SeenFrameworkDirs.insert(CurEntry.getFrameworkDir()).second)
 554         continue;
 555     } else {
 556       assert(CurEntry.isHeaderMap() && "Not a headermap or normal dir?");
 557       // If this isn't the first time we've seen this headermap, remove it.
 558       if (SeenHeaderMaps.insert(CurEntry.getHeaderMap()).second)
 559         continue;
 560     }
 561
 562     // If we have a normal #include dir/framework/headermap that is shadowed
 563     // later in the chain by a system include location, we actually want to
 564     // ignore the user's request and drop the user dir... keeping the system
 565     // dir.  This is weird, but required to emulate GCC's search path correctly.
 566     //
 567     // Since dupes of system dirs are rare, just rescan to find the original
 568     // that we're nuking instead of using a DenseMap.
 569     if (CurEntry.getDirCharacteristic() != SrcMgr::C_User) {
 570       // Find the dir that this is the same of.
 571       unsigned FirstDir;
 572       for (FirstDir = 0; ; ++FirstDir) {
 573         assert(FirstDir != i && "Didn't find dupe?");
 574
 575         const DirectoryLookup &SearchEntry = SearchList[FirstDir];
 576
 577         // If these are different lookup types, then they can't be the dupe.
 578         if (SearchEntry.getLookupType() != CurEntry.getLookupType())
 579           continue;
 580
 581         bool isSame;
 582         if (CurEntry.isNormalDir())
 583           isSame = SearchEntry.getDir() == CurEntry.getDir();
 584         else if (CurEntry.isFramework())
 585           isSame = SearchEntry.getFrameworkDir() == CurEntry.getFrameworkDir();
 586         else {
 587           assert(CurEntry.isHeaderMap() && "Not a headermap or normal dir?");
 588           isSame = SearchEntry.getHeaderMap() == CurEntry.getHeaderMap();
 589         }
 590
 591         if (isSame)
 592           break;
 593       }
 594
 595       // If the first dir in the search path is a non-system dir, zap it
 596       // instead of the system one.
 597       if (SearchList[FirstDir].getDirCharacteristic() == SrcMgr::C_User)
 598         DirToRemove = FirstDir;
 599     }
 600
 601     if (Verbose) {
 602       llvm::errs() << "ignoring duplicate directory \""
 603                    << CurEntry.getName() << "\"\n";
 604       if (DirToRemove != i)
 605         llvm::errs() << "  as it is a non-system directory that duplicates "
 606                      << "a system directory\n";
 607     }
 608     if (DirToRemove != i)
 609       ++NonSystemRemoved;
 610
 611     // This is reached if the current entry is a duplicate.  Remove the
 612     // DirToRemove (usually the current dir).
 613     SearchList.erase(SearchList.begin()+DirToRemove);
 614     --i;
 615   }
 616   return NonSystemRemoved;
 617 }
 618
 619
 620 void InitHeaderSearch::Realize(const LangOptions &Lang) {
 621   // Concatenate ANGLE+SYSTEM+AFTER chains together into SearchList.
 622   std::vector<DirectoryLookup> SearchList;
 623   SearchList.reserve(IncludePath.size());
 624
 625   // Quoted arguments go first.
 626   for (path_iterator it = IncludePath.begin(), ie = IncludePath.end();
 627        it != ie; ++it) {
 628     if (it->first == Quoted)
 629       SearchList.push_back(it->second);
 630   }
 631   // Deduplicate and remember index.
 632   RemoveDuplicates(SearchList, 0, Verbose);
 633   unsigned NumQuoted = SearchList.size();
 634
 635   for (path_iterator it = IncludePath.begin(), ie = IncludePath.end();
 636        it != ie; ++it) {
 637     if (it->first == Angled || it->first == IndexHeaderMap)
 638       SearchList.push_back(it->second);
 639   }
 640
 641   RemoveDuplicates(SearchList, NumQuoted, Verbose);
 642   unsigned NumAngled = SearchList.size();
 643
 644   for (path_iterator it = IncludePath.begin(), ie = IncludePath.end();
 645        it != ie; ++it) {
 646     if (it->first == System || it->first == ExternCSystem ||
 647         (!Lang.ObjC1 && !Lang.CPlusPlus && it->first == CSystem)    ||
 648         (/*FIXME !Lang.ObjC1 && */Lang.CPlusPlus  && it->first == CXXSystem)  ||
 649         (Lang.ObjC1  && !Lang.CPlusPlus && it->first == ObjCSystem) ||
 650         (Lang.ObjC1  && Lang.CPlusPlus  && it->first == ObjCXXSystem))
 651       SearchList.push_back(it->second);
 652   }
 653
 654   for (path_iterator it = IncludePath.begin(), ie = IncludePath.end();
 655        it != ie; ++it) {
 656     if (it->first == After)
 657       SearchList.push_back(it->second);
 658   }
 659
 660   // Remove duplicates across both the Angled and System directories.  GCC does
 661   // this and failing to remove duplicates across these two groups breaks
 662   // #include_next.
 663   unsigned NonSystemRemoved = RemoveDuplicates(SearchList, NumQuoted, Verbose);
 664   NumAngled -= NonSystemRemoved;
 665
 666   bool DontSearchCurDir = false;  // TODO: set to true if -I- is set?
 667   Headers.SetSearchPaths(SearchList, NumQuoted, NumAngled, DontSearchCurDir);
 668
 669   Headers.SetSystemHeaderPrefixes(SystemHeaderPrefixes);
 670
 671   // If verbose, print the list of directories that will be searched.
 672   if (Verbose) {
 673     llvm::errs() << "#include \"...\" search starts here:\n";
 674     for (unsigned i = 0, e = SearchList.size(); i != e; ++i) {
 675       if (i == NumQuoted)
 676         llvm::errs() << "#include <...> search starts here:\n";
 677       const char *Name = SearchList[i].getName();
 678       const char *Suffix;
 679       if (SearchList[i].isNormalDir())
 680         Suffix = "";
 681       else if (SearchList[i].isFramework())
 682         Suffix = " (framework directory)";
 683       else {
 684         assert(SearchList[i].isHeaderMap() && "Unknown DirectoryLookup");
 685         Suffix = " (headermap)";
 686       }
 687       llvm::errs() << " " << Name << Suffix << "\n";
 688     }
 689     llvm::errs() << "End of search list.\n";
 690   }
 691 }
 692
 693 void clang::ApplyHeaderSearchOptions(HeaderSearch &HS,
 694                                      const HeaderSearchOptions &HSOpts,
 695                                      const LangOptions &Lang,
 696                                      const llvm::Triple &Triple) {
 697   InitHeaderSearch Init(HS, HSOpts.Verbose, HSOpts.Sysroot);
 698
 699   // Add the user defined entries.
 700   for (unsigned i = 0, e = HSOpts.UserEntries.size(); i != e; ++i) {
 701     const HeaderSearchOptions::Entry &E = HSOpts.UserEntries[i];
 702     if (E.IgnoreSysRoot) {
 703       Init.AddUnmappedPath(E.Path, E.Group, E.IsFramework);
 704     } else {
 705       Init.AddPath(E.Path, E.Group, E.IsFramework);
 706     }
 707   }
 708
 709   Init.AddDefaultIncludePaths(Lang, Triple, HSOpts);
 710
 711   for (unsigned i = 0, e = HSOpts.SystemHeaderPrefixes.size(); i != e; ++i)
 712     Init.AddSystemHeaderPrefix(HSOpts.SystemHeaderPrefixes[i].Prefix,
 713                                HSOpts.SystemHeaderPrefixes[i].IsSystemHeader);
 714
 715   if (HSOpts.UseBuiltinIncludes) {
 716     // Set up the builtin include directory in the module map.
 717     SmallString<128> P = StringRef(HSOpts.ResourceDir);
 718     llvm::sys::path::append(P, "include");
 719     if (const DirectoryEntry *Dir = HS.getFileMgr().getDirectory(P))
 720       HS.getModuleMap().setBuiltinIncludeDir(Dir);
 721   }
 722
 723   Init.Realize(Lang);
 724 }