C++ Triple::isOSDarwin方法代码示例

void InitHeaderSearch::AddDefaultSystemIncludePaths(const LangOptions &Lang,
                                                    const llvm::Triple &triple,
                                            const HeaderSearchOptions &HSOpts) {
  if (Lang.CPlusPlus && HSOpts.UseStandardCXXIncludes) {
    if (HSOpts.UseLibcxx) {
      if (triple.isOSDarwin()) {
        // On Darwin, libc++ may be installed alongside the compiler in
        // lib/c++/v1.
        llvm::sys::Path P(HSOpts.ResourceDir);
        if (!P.isEmpty()) {
          P.eraseComponent();  // Remove version from foo/lib/clang/version
          P.eraseComponent();  // Remove clang from foo/lib/clang
          
          // Get foo/lib/c++/v1
          P.appendComponent("c++");
          P.appendComponent("v1");
          AddPath(P.str(), CXXSystem, true, false, false, true);
        }
      }
      
      AddPath("/usr/include/c++/v1", CXXSystem, true, false, false);
    }
    else
      AddDefaultCPlusPlusIncludePaths(triple, HSOpts);
  }

  AddDefaultCIncludePaths(triple, HSOpts);

  // Add the default framework include paths on Darwin.
  if (triple.isOSDarwin()) {
    AddPath("/System/Library/Frameworks", System, true, false, true);
    AddPath("/Library/Frameworks", System, true, false, true);
  }
}

void InitHeaderSearch::AddDefaultIncludePaths(const LangOptions &Lang,
                                              const llvm::Triple &triple,
                                            const HeaderSearchOptions &HSOpts) {
  // NB: This code path is going away. All of the logic is moving into the
  // driver which has the information necessary to do target-specific
  // selections of default include paths. Each target which moves there will be
  // exempted from this logic here until we can delete the entire pile of code.
  switch (triple.getOS()) {
  default:
    break; // Everything else continues to use this routine's logic.

  case llvm::Triple::Linux:
  case llvm::Triple::Solaris:
    return;

  case llvm::Triple::Win32:
    if (triple.getEnvironment() != llvm::Triple::Cygnus ||
        triple.isOSBinFormatMachO())
      return;
    break;
  }

  if (Lang.CPlusPlus && HSOpts.UseStandardCXXIncludes &&
      HSOpts.UseStandardSystemIncludes) {
    if (HSOpts.UseLibcxx) {
      if (triple.isOSDarwin()) {
        // On Darwin, libc++ may be installed alongside the compiler in
        // include/c++/v1.
        if (!HSOpts.ResourceDir.empty()) {
          // Remove version from foo/lib/clang/version
          StringRef NoVer = llvm::sys::path::parent_path(HSOpts.ResourceDir);
          // Remove clang from foo/lib/clang
          StringRef Lib = llvm::sys::path::parent_path(NoVer);
          // Remove lib from foo/lib
          SmallString<128> P = llvm::sys::path::parent_path(Lib);

          // Get foo/include/c++/v1
          llvm::sys::path::append(P, "include", "c++", "v1");
          AddUnmappedPath(P, CXXSystem, false);
        }
      }
      AddPath("/usr/include/c++/v1", CXXSystem, false);
    } else {
      AddDefaultCPlusPlusIncludePaths(triple, HSOpts);
    }
  }

  AddDefaultCIncludePaths(triple, HSOpts);

  // Add the default framework include paths on Darwin.
  if (HSOpts.UseStandardSystemIncludes) {
    if (triple.isOSDarwin()) {
      AddPath("/System/Library/Frameworks", System, true);
      AddPath("/Library/Frameworks", System, true);
    }
  }
}

void InitHeaderSearch::AddDefaultIncludePaths(const LangOptions &Lang,
                                              const llvm::Triple &triple,
                                            const HeaderSearchOptions &HSOpts) {
  // NB: This code path is going away. All of the logic is moving into the
  // driver which has the information necessary to do target-specific
  // selections of default include paths. Each target which moves there will be
  // exempted from this logic here until we can delete the entire pile of code.
  switch (triple.getOS()) {
  default:
    break; // Everything else continues to use this routine's logic.

  case llvm::Triple::Linux:
  case llvm::Triple::Win32:
    return;
  }

  if (Lang.CPlusPlus && HSOpts.UseStandardCXXIncludes &&
      HSOpts.UseStandardSystemIncludes) {
    if (HSOpts.UseLibcxx) {
      if (triple.isOSDarwin()) {
        // On Darwin, libc++ may be installed alongside the compiler in
        // lib/c++/v1.
        llvm::sys::Path P(HSOpts.ResourceDir);
        if (!P.isEmpty()) {
          P.eraseComponent();  // Remove version from foo/lib/clang/version
          P.eraseComponent();  // Remove clang from foo/lib/clang
          
          // Get foo/lib/c++/v1
          P.appendComponent("c++");
          P.appendComponent("v1");
          AddPath(P.str(), CXXSystem, true, false, false, true);
        }
      }
      // On Solaris, include the support directory for things like xlocale and
      // fudged system headers.
      if (triple.getOS() == llvm::Triple::Solaris) 
        AddPath("/usr/include/c++/v1/support/solaris", CXXSystem, true, false,
            false);
      
      AddPath("/usr/include/c++/v1", CXXSystem, true, false, false);
    } else {
      AddDefaultCPlusPlusIncludePaths(triple, HSOpts);
    }
  }

  AddDefaultCIncludePaths(triple, HSOpts);

  // Add the default framework include paths on Darwin.
  if (HSOpts.UseStandardSystemIncludes) {
    if (triple.isOSDarwin()) {
      AddPath("/System/Library/Frameworks", System, true, false, true);
      AddPath("/Library/Frameworks", System, true, false, true);
    }
  }
}

static std::string getX86TargetCPU(const llvm::Triple &triple)
{
    // Select the default CPU if none was given (or detection failed).

    // Intel Macs are relatively recent, take advantage of that.
    if (triple.isOSDarwin())
        return triple.isArch64Bit() ? "core2" : "yonah";

    // Everything else goes to x86-64 in 64-bit mode.
    if (triple.isArch64Bit())
        return "x86-64";

    if (triple.getOSName().startswith("haiku"))
        return "i586";
    if (triple.getOSName().startswith("openbsd"))
        return "i486";
    if (triple.getOSName().startswith("bitrig"))
        return "i686";
    if (triple.getOSName().startswith("freebsd"))
        return "i486";
    if (triple.getOSName().startswith("netbsd"))
        return "i486";
#if LDC_LLVM_VER >= 302
    // All x86 devices running Android have core2 as their common
    // denominator. This makes a better choice than pentium4.
    if (triple.getEnvironment() == llvm::Triple::Android)
        return "core2";
#endif

    // Fallback to p4.
    return "pentium4";
}

static std::pair<StringRef, clang::VersionTuple>
getOSAndVersionForDiagnostics(const llvm::Triple &triple) {
  StringRef osName;
  unsigned major, minor, micro;
  if (triple.isMacOSX()) {
    // macOS triples represent their versions differently, so we have to use the
    // special accessor.
    triple.getMacOSXVersion(major, minor, micro);
    osName = swift::prettyPlatformString(PlatformKind::OSX);
  } else {
    triple.getOSVersion(major, minor, micro);
    if (triple.isWatchOS()) {
      osName = swift::prettyPlatformString(PlatformKind::watchOS);
    } else if (triple.isTvOS()) {
      assert(triple.isiOS() &&
             "LLVM treats tvOS as a kind of iOS, so tvOS is checked first");
      osName = swift::prettyPlatformString(PlatformKind::tvOS);
    } else if (triple.isiOS()) {
      osName = swift::prettyPlatformString(PlatformKind::iOS);
    } else {
      assert(!triple.isOSDarwin() && "unknown Apple OS");
      // Fallback to the LLVM triple name. This isn't great (it won't be
      // capitalized or anything), but it's better than nothing.
      osName = triple.getOSName();
    }
  }

  assert(!osName.empty());
  clang::VersionTuple version;
  if (micro != 0)
    version = clang::VersionTuple(major, minor, micro);
  else
    version = clang::VersionTuple(major, minor);
  return {osName, version};
}

OptionSet<SanitizerKind> swift::parseSanitizerArgValues(
    const llvm::opt::ArgList &Args,
    const llvm::opt::Arg *A,
    const llvm::Triple &Triple,
    DiagnosticEngine &Diags,
    llvm::function_ref<bool(llvm::StringRef)> sanitizerRuntimeLibExists) {
  OptionSet<SanitizerKind> sanitizerSet;

  // Find the sanitizer kind.
  for (int i = 0, n = A->getNumValues(); i != n; ++i) {
    StringRef opt = A->getValue(i);
    if (opt == "address") {
      sanitizerSet |= SanitizerKind::Address;
    } else if (opt == "thread") {
      sanitizerSet |= SanitizerKind::Thread;
    } else if (opt == "fuzzer") {
      sanitizerSet |= SanitizerKind::Fuzzer;
    } else {
      Diags.diagnose(SourceLoc(), diag::error_unsupported_option_argument,
          A->getOption().getPrefixedName(), A->getValue(i));
    }
  }

  // Sanitizers are only supported on Linux or Darwin.
  if (!(Triple.isOSDarwin() || Triple.isOSLinux())) {
    SmallString<128> b;
    Diags.diagnose(SourceLoc(), diag::error_unsupported_opt_for_target,
      (A->getOption().getPrefixedName() +
          StringRef(A->getAsString(Args))).toStringRef(b),
      Triple.getTriple());
  }

  // Address and thread sanitizers can not be enabled concurrently.
  if ((sanitizerSet & SanitizerKind::Thread)
        && (sanitizerSet & SanitizerKind::Address)) {
    SmallString<128> b1;
    SmallString<128> b2;
    Diags.diagnose(SourceLoc(), diag::error_argument_not_allowed_with,
        (A->getOption().getPrefixedName()
            + toStringRef(SanitizerKind::Address)).toStringRef(b1),
        (A->getOption().getPrefixedName()
            + toStringRef(SanitizerKind::Thread)).toStringRef(b2));
  }

  // Thread Sanitizer only works on OS X and the simulators. It's only supported
  // on 64 bit architectures.
  if ((sanitizerSet & SanitizerKind::Thread) &&
      !isTSanSupported(Triple, sanitizerRuntimeLibExists)) {
    SmallString<128> b;
    Diags.diagnose(SourceLoc(), diag::error_unsupported_opt_for_target,
      (A->getOption().getPrefixedName()
          + toStringRef(SanitizerKind::Thread)).toStringRef(b),
      Triple.getTriple());
  }

  return sanitizerSet;
}

SanitizerKind swift::parseSanitizerArgValues(const llvm::opt::Arg *A,
                                      const llvm::Triple &Triple,
                                      DiagnosticEngine &Diags) {
  SanitizerKind kind = SanitizerKind::None;

  // Find the sanitizer kind.
  SanitizerKind pKind = SanitizerKind::None;
  for (int i = 0, n = A->getNumValues(); i != n; ++i) {
    kind =
    llvm::StringSwitch<SanitizerKind>(A->getValue(i))
      .Case("address", SanitizerKind::Address)
      .Case("thread", SanitizerKind::Thread)
      .Default(SanitizerKind::None);

    if (kind == SanitizerKind::None) {
      Diags.diagnose(SourceLoc(), diag::error_unsupported_option_argument,
        A->getOption().getPrefixedName(), A->getValue(i));
      return kind;
    }

    // Currently, more than one sanitizer cannot be enabled at the same time.
    if (pKind != SanitizerKind::None && pKind != kind) {
      SmallString<128> pb;
      SmallString<128> b;
      Diags.diagnose(SourceLoc(), diag::error_argument_not_allowed_with,
        (A->getOption().getPrefixedName() + toStringRef(pKind)).toStringRef(pb),
        (A->getOption().getPrefixedName() + toStringRef(kind)).toStringRef(b));
    }
    pKind = kind;
  }

  if (kind == SanitizerKind::None)
    return kind;

  // Check if the target is supported for this sanitizer.
  // None of the sanitizers work on Linux right now.
  if (!Triple.isOSDarwin()) {
    SmallString<128> b;
    Diags.diagnose(SourceLoc(), diag::error_unsupported_opt_for_target,
      (A->getOption().getPrefixedName() + toStringRef(kind)).toStringRef(b),
      Triple.getTriple());
  }
  // Thread Sanitizer only works on OS X and the simulators. It's only supported
  // on 64 bit architectures.
  if (kind == SanitizerKind::Thread &&
      (!(Triple.isMacOSX() || tripleIsAnySimulator(Triple)) ||
       !Triple.isArch64Bit())) {
    SmallString<128> b;
    Diags.diagnose(SourceLoc(), diag::error_unsupported_opt_for_target,
      (A->getOption().getPrefixedName() + toStringRef(kind)).toStringRef(b),
      Triple.getTriple());
  }

  return kind;
}

static std::string getX86TargetCPU(std::string arch,
    const llvm::Triple &triple)
{
    if (!arch.empty()) {
        if (arch != "native")
          return arch;

        // FIXME: Reject attempts to use -march=native unless the target matches
        // the host.
        //
        // FIXME: We should also incorporate the detected target features for use
        // with -native.
        std::string cpu = llvm::sys::getHostCPUName();
        if (!cpu.empty() && cpu != "generic")
          return cpu;
    }

    // Select the default CPU if none was given (or detection failed).

    bool is64Bit = triple.getArch() == llvm::Triple::x86_64;

    if (triple.isOSDarwin())
        return is64Bit ? "core2" : "yonah";

    // Everything else goes to x86-64 in 64-bit mode.
    if (is64Bit)
        return "x86-64";

    if (triple.getOSName().startswith("haiku"))
        return "i586";
    if (triple.getOSName().startswith("openbsd"))
        return "i486";
    if (triple.getOSName().startswith("bitrig"))
        return "i686";
    if (triple.getOSName().startswith("freebsd"))
        return "i486";
    if (triple.getOSName().startswith("netbsd"))
        return "i486";
#if LDC_LLVM_VER >= 302
    // All x86 devices running Android have core2 as their common
    // denominator. This makes a better choice than pentium4.
    if (triple.getEnvironment() == llvm::Triple::Android)
        return "core2";
#endif

    // Fallback to p4.
    return "pentium4";
}

StringRef swift::getPlatformNameForTriple(const llvm::Triple &triple) {
  if (triple.isOSDarwin())
    return getPlatformNameForDarwin(getDarwinPlatformKind(triple));

  if (triple.isAndroid())
    return "android";

  if (triple.isOSLinux())
    return "linux";

  if (triple.isOSFreeBSD())
    return "freebsd";
	
  if (triple.isOSWindows())
    return  "windows";

  return "";
}

/// Configures target-specific information for x86-64 platforms.
static void configureX86_64(IRGenModule &IGM, const llvm::Triple &triple,
                            SwiftTargetInfo &target) {
  setToMask(target.PointerSpareBits, 64,
            SWIFT_ABI_X86_64_SWIFT_SPARE_BITS_MASK);
  setToMask(target.ObjCPointerReservedBits, 64,
            SWIFT_ABI_X86_64_OBJC_RESERVED_BITS_MASK);
  
  if (triple.isOSDarwin()) {
    target.LeastValidPointerValue =
      SWIFT_ABI_DARWIN_X86_64_LEAST_VALID_POINTER;
  }

  // x86-64 has every objc_msgSend variant known to humankind.
  target.ObjCUseFPRet = true;
  target.ObjCUseFP2Ret = true;

  // x86-64 requires ISA-masking.
  target.ObjCUseISAMask = true;
}

void InitHeaderSearch::AddDefaultIncludePaths(const LangOptions &Lang,
                                              const llvm::Triple &triple,
                                            const HeaderSearchOptions &HSOpts) {
  // NB: This code path is going away. All of the logic is moving into the
  // driver which has the information necessary to do target-specific
  // selections of default include paths. Each target which moves there will be
  // exempted from this logic here until we can delete the entire pile of code.
  switch (triple.getOS()) {
  default:
    break; // Everything else continues to use this routine's logic.

  case llvm::Triple::Linux:
  case llvm::Triple::Hurd:
  case llvm::Triple::Solaris:
    return;

  case llvm::Triple::Win32:
    if (triple.getEnvironment() != llvm::Triple::Cygnus ||
        triple.isOSBinFormatMachO())
      return;
    break;
  }

  if (Lang.CPlusPlus && !Lang.AsmPreprocessor &&
      HSOpts.UseStandardCXXIncludes && HSOpts.UseStandardSystemIncludes) {
    if (HSOpts.UseLibcxx) {
      AddPath("/usr/include/c++/v1", CXXSystem, false);
    } else {
      AddDefaultCPlusPlusIncludePaths(Lang, triple, HSOpts);
    }
  }

  AddDefaultCIncludePaths(triple, HSOpts);

  // Add the default framework include paths on Darwin.
  if (HSOpts.UseStandardSystemIncludes) {
    if (triple.isOSDarwin()) {
      AddPath("/System/Library/Frameworks", System, true);
      AddPath("/Library/Frameworks", System, true);
    }
  }
}

StringRef swift::getPlatformNameForTriple(const llvm::Triple &triple) {
  if (triple.isOSDarwin())
    return getPlatformNameForDarwin(getDarwinPlatformKind(triple));

  if (triple.isAndroid())
    return "android";

  if (triple.isOSLinux())
    return "linux";

  if (triple.isOSFreeBSD())
    return "freebsd";

  if (triple.isKnownWindowsMSVCEnvironment())
    return  "windows";

  if (triple.isWindowsCygwinEnvironment())
    return  "cygwin";

  if (triple.isWindowsGNUEnvironment())
    return  "mingw";

  return "";
}

ARMTargetInfo::ARMTargetInfo(const llvm::Triple &Triple,
                             const TargetOptions &Opts)
    : TargetInfo(Triple), FPMath(FP_Default), IsAAPCS(true), LDREX(0),
      HW_FP(0) {
  bool IsOpenBSD = Triple.isOSOpenBSD();
  bool IsNetBSD = Triple.isOSNetBSD();

  // FIXME: the isOSBinFormatMachO is a workaround for identifying a Darwin-like
  // environment where size_t is `unsigned long` rather than `unsigned int`

  PtrDiffType = IntPtrType =
      (Triple.isOSDarwin() || Triple.isOSBinFormatMachO() || IsOpenBSD ||
       IsNetBSD)
          ? SignedLong
          : SignedInt;

  SizeType = (Triple.isOSDarwin() || Triple.isOSBinFormatMachO() || IsOpenBSD ||
              IsNetBSD)
                 ? UnsignedLong
                 : UnsignedInt;

  // ptrdiff_t is inconsistent on Darwin
  if ((Triple.isOSDarwin() || Triple.isOSBinFormatMachO()) &&
      !Triple.isWatchABI())
    PtrDiffType = SignedInt;

  // Cache arch related info.
  setArchInfo();

  // {} in inline assembly are neon specifiers, not assembly variant
  // specifiers.
  NoAsmVariants = true;

  // FIXME: This duplicates code from the driver that sets the -target-abi
  // option - this code is used if -target-abi isn't passed and should
  // be unified in some way.
  if (Triple.isOSBinFormatMachO()) {
    // The backend is hardwired to assume AAPCS for M-class processors, ensure
    // the frontend matches that.
    if (Triple.getEnvironment() == llvm::Triple::EABI ||
        Triple.getOS() == llvm::Triple::UnknownOS ||
        ArchProfile == llvm::ARM::ProfileKind::M) {
      setABI("aapcs");
    } else if (Triple.isWatchABI()) {
      setABI("aapcs16");
    } else {
      setABI("apcs-gnu");
    }
  } else if (Triple.isOSWindows()) {
    // FIXME: this is invalid for WindowsCE
    setABI("aapcs");
  } else {
    // Select the default based on the platform.
    switch (Triple.getEnvironment()) {
    case llvm::Triple::Android:
    case llvm::Triple::GNUEABI:
    case llvm::Triple::GNUEABIHF:
    case llvm::Triple::MuslEABI:
    case llvm::Triple::MuslEABIHF:
      setABI("aapcs-linux");
      break;
    case llvm::Triple::EABIHF:
    case llvm::Triple::EABI:
      setABI("aapcs");
      break;
    case llvm::Triple::GNU:
      setABI("apcs-gnu");
      break;
    default:
      if (IsNetBSD)
        setABI("apcs-gnu");
      else if (IsOpenBSD)
        setABI("aapcs-linux");
      else
        setABI("aapcs");
      break;
    }
  }

  // ARM targets default to using the ARM C++ ABI.
  TheCXXABI.set(TargetCXXABI::GenericARM);

  // ARM has atomics up to 8 bytes
  setAtomic();

  // Maximum alignment for ARM NEON data types should be 64-bits (AAPCS)
  if (IsAAPCS && (Triple.getEnvironment() != llvm::Triple::Android))
    MaxVectorAlign = 64;

  // Do force alignment of members that follow zero length bitfields.  If
  // the alignment of the zero-length bitfield is greater than the member
  // that follows it, `bar', `bar' will be aligned as the  type of the
  // zero length bitfield.
  UseZeroLengthBitfieldAlignment = true;

  if (Triple.getOS() == llvm::Triple::Linux ||
      Triple.getOS() == llvm::Triple::UnknownOS)
    this->MCountName = Opts.EABIVersion == llvm::EABI::GNU
                           ? "\01__gnu_mcount_nc"
                           : "\01mcount";
//.........这里部分代码省略.........

//.........这里部分代码省略.........
    Builder.defineMacro("__weak", "__attribute__((objc_gc(weak)))");
    Builder.defineMacro("__strong", "");
    Builder.defineMacro("__unsafe_unretained", "");
  }

  if (Opts.Static)
    Builder.defineMacro("__STATIC__");
  else
    Builder.defineMacro("__DYNAMIC__");

  if (Opts.POSIXThreads)
    Builder.defineMacro("_REENTRANT");

  // Get the platform type and version number from the triple.
  unsigned Maj, Min, Rev;
  if (Triple.isMacOSX()) {
    Triple.getMacOSXVersion(Maj, Min, Rev);
    PlatformName = "macos";
  } else {
    Triple.getOSVersion(Maj, Min, Rev);
    PlatformName = llvm::Triple::getOSTypeName(Triple.getOS());
  }

  // If -target arch-pc-win32-macho option specified, we're
  // generating code for Win32 ABI. No need to emit
  // __ENVIRONMENT_XX_OS_VERSION_MIN_REQUIRED__.
  if (PlatformName == "win32") {
    PlatformMinVersion = VersionTuple(Maj, Min, Rev);
    return;
  }

  // Set the appropriate OS version define.
  if (Triple.isiOS()) {
    assert(Maj < 100 && Min < 100 && Rev < 100 && "Invalid version!");
    char Str[7];
    if (Maj < 10) {
      Str[0] = '0' + Maj;
      Str[1] = '0' + (Min / 10);
      Str[2] = '0' + (Min % 10);
      Str[3] = '0' + (Rev / 10);
      Str[4] = '0' + (Rev % 10);
      Str[5] = '\0';
    } else {
      // Handle versions >= 10.
      Str[0] = '0' + (Maj / 10);
      Str[1] = '0' + (Maj % 10);
      Str[2] = '0' + (Min / 10);
      Str[3] = '0' + (Min % 10);
      Str[4] = '0' + (Rev / 10);
      Str[5] = '0' + (Rev % 10);
      Str[6] = '\0';
    }
    if (Triple.isTvOS())
      Builder.defineMacro("__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__", Str);
    else
      Builder.defineMacro("__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__",
                          Str);

  } else if (Triple.isWatchOS()) {
    assert(Maj < 10 && Min < 100 && Rev < 100 && "Invalid version!");
    char Str[6];
    Str[0] = '0' + Maj;
    Str[1] = '0' + (Min / 10);
    Str[2] = '0' + (Min % 10);
    Str[3] = '0' + (Rev / 10);
    Str[4] = '0' + (Rev % 10);
    Str[5] = '\0';
    Builder.defineMacro("__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__", Str);
  } else if (Triple.isMacOSX()) {
    // Note that the Driver allows versions which aren't representable in the
    // define (because we only get a single digit for the minor and micro
    // revision numbers). So, we limit them to the maximum representable
    // version.
    assert(Maj < 100 && Min < 100 && Rev < 100 && "Invalid version!");
    char Str[7];
    if (Maj < 10 || (Maj == 10 && Min < 10)) {
      Str[0] = '0' + (Maj / 10);
      Str[1] = '0' + (Maj % 10);
      Str[2] = '0' + std::min(Min, 9U);
      Str[3] = '0' + std::min(Rev, 9U);
      Str[4] = '\0';
    } else {
      // Handle versions > 10.9.
      Str[0] = '0' + (Maj / 10);
      Str[1] = '0' + (Maj % 10);
      Str[2] = '0' + (Min / 10);
      Str[3] = '0' + (Min % 10);
      Str[4] = '0' + (Rev / 10);
      Str[5] = '0' + (Rev % 10);
      Str[6] = '\0';
    }
    Builder.defineMacro("__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__", Str);
  }

  // Tell users about the kernel if there is one.
  if (Triple.isOSDarwin())
    Builder.defineMacro("__MACH__");

  PlatformMinVersion = VersionTuple(Maj, Min, Rev);
}

void InitHeaderSearch::AddDefaultCPlusPlusIncludePaths(
    const LangOptions &LangOpts, const llvm::Triple &triple,
    const HeaderSearchOptions &HSOpts) {
  llvm::Triple::OSType os = triple.getOS();
  // FIXME: temporary hack: hard-coded paths.

  if (triple.isOSDarwin()) {
    bool IsBaseFound = true;
    switch (triple.getArch()) {
    default: break;

    case llvm::Triple::ppc:
    case llvm::Triple::ppc64:
      IsBaseFound = AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.2.1",
                                                "powerpc-apple-darwin10", "",
                                                "ppc64", triple);
      IsBaseFound |= AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.0.0",
                                                 "powerpc-apple-darwin10", "",
                                                 "ppc64", triple);
      break;

    case llvm::Triple::x86:
    case llvm::Triple::x86_64:
      IsBaseFound = AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.2.1",
                                                "i686-apple-darwin10", "",
                                                "x86_64", triple);
      IsBaseFound |= AddGnuCPlusPlusIncludePaths(
          "/usr/include/c++/4.0.0", "i686-apple-darwin8", "", "", triple);
      break;

    case llvm::Triple::arm:
    case llvm::Triple::thumb:
      IsBaseFound = AddGnuCPlusPlusIncludePaths(
          "/usr/include/c++/4.2.1", "arm-apple-darwin10", "v7", "", triple);
      IsBaseFound |= AddGnuCPlusPlusIncludePaths(
          "/usr/include/c++/4.2.1", "arm-apple-darwin10", "v6", "", triple);
      break;

    case llvm::Triple::aarch64:
      IsBaseFound = AddGnuCPlusPlusIncludePaths(
          "/usr/include/c++/4.2.1", "arm64-apple-darwin10", "", "", triple);
      break;
    }
    // Warn when compiling pure C++ / Objective-C++ only.
    if (!IsBaseFound &&
        !(LangOpts.CUDA || LangOpts.OpenCL || LangOpts.RenderScript)) {
      Headers.getDiags().Report(SourceLocation(),
                                diag::warn_stdlibcxx_not_found);
    }
    return;
  }

  switch (os) {
  case llvm::Triple::Linux:
  case llvm::Triple::Hurd:
  case llvm::Triple::Solaris:
    llvm_unreachable("Include management is handled in the driver.");
    break;
  case llvm::Triple::Win32:
    switch (triple.getEnvironment()) {
    default: llvm_unreachable("Include management is handled in the driver.");
    case llvm::Triple::Cygnus:
      // Cygwin-1.7
      AddMinGWCPlusPlusIncludePaths("/usr/lib/gcc", "i686-pc-cygwin", "4.7.3");
      AddMinGWCPlusPlusIncludePaths("/usr/lib/gcc", "i686-pc-cygwin", "4.5.3");
      AddMinGWCPlusPlusIncludePaths("/usr/lib/gcc", "i686-pc-cygwin", "4.3.4");
      // g++-4 / Cygwin-1.5
      AddMinGWCPlusPlusIncludePaths("/usr/lib/gcc", "i686-pc-cygwin", "4.3.2");
      break;
    }
    break;
  case llvm::Triple::DragonFly:
    AddPath("/usr/include/c++/5.0", CXXSystem, false);
    break;
  case llvm::Triple::OpenBSD: {
    std::string t = triple.getTriple();
    if (t.substr(0, 6) == "x86_64")
      t.replace(0, 6, "amd64");
    AddGnuCPlusPlusIncludePaths("/usr/include/g++",
                                t, "", "", triple);
    break;
  }
  case llvm::Triple::Minix:
    AddGnuCPlusPlusIncludePaths("/usr/gnu/include/c++/4.4.3",
                                "", "", "", triple);
    break;
  default:
    break;
  }
}