Index: llvm-toolchain-snapshot_10~+20191020075550+5b8546023f3/clang/lib/Driver/CMakeLists.txt
===================================================================
--- llvm-toolchain-snapshot_10~+20191020075550+5b8546023f3.orig/clang/lib/Driver/CMakeLists.txt
+++ llvm-toolchain-snapshot_10~+20191020075550+5b8546023f3/clang/lib/Driver/CMakeLists.txt
@@ -49,6 +49,7 @@ add_clang_library(clangDriver
   ToolChains/HIP.cpp
   ToolChains/Hexagon.cpp
   ToolChains/Hurd.cpp
+  ToolChains/KFreeBSD.cpp
   ToolChains/Linux.cpp
   ToolChains/MipsLinux.cpp
   ToolChains/MinGW.cpp
Index: llvm-toolchain-snapshot_10~+20191020075550+5b8546023f3/clang/lib/Driver/Driver.cpp
===================================================================
--- llvm-toolchain-snapshot_10~+20191020075550+5b8546023f3.orig/clang/lib/Driver/Driver.cpp
+++ llvm-toolchain-snapshot_10~+20191020075550+5b8546023f3/clang/lib/Driver/Driver.cpp
@@ -26,6 +26,7 @@
 #include "ToolChains/Haiku.h"
 #include "ToolChains/Hexagon.h"
 #include "ToolChains/Hurd.h"
+#include "ToolChains/KFreeBSD.h"
 #include "ToolChains/Lanai.h"
 #include "ToolChains/Linux.h"
 #include "ToolChains/MSP430.h"
@@ -4727,6 +4728,9 @@ const ToolChain &Driver::getToolChain(co
     case llvm::Triple::FreeBSD:
       TC = std::make_unique<toolchains::FreeBSD>(*this, Target, Args);
       break;
+    case llvm::Triple::kFreeBSD:
+      TC = std::make_unique<toolchains::kFreeBSD>(*this, Target, Args);
+      break;
     case llvm::Triple::Minix:
       TC = std::make_unique<toolchains::Minix>(*this, Target, Args);
       break;
Index: llvm-toolchain-snapshot_10~+20191020075550+5b8546023f3/clang/lib/Driver/ToolChains/Clang.cpp
===================================================================
--- llvm-toolchain-snapshot_10~+20191020075550+5b8546023f3.orig/clang/lib/Driver/ToolChains/Clang.cpp
+++ llvm-toolchain-snapshot_10~+20191020075550+5b8546023f3/clang/lib/Driver/ToolChains/Clang.cpp
@@ -453,7 +453,7 @@ static bool useFramePointerForTargetByDe
   }
 
   if (Triple.isOSLinux() || Triple.getOS() == llvm::Triple::CloudABI ||
-      Triple.isOSHurd()) {
+      Triple.isOSHurd() || Triple.isOSkFreeBSD()) {
     switch (Triple.getArch()) {
     // Don't use a frame pointer on linux if optimizing for certain targets.
     case llvm::Triple::mips64:
Index: llvm-toolchain-snapshot_10~+20191020075550+5b8546023f3/clang/lib/Driver/ToolChains/Gnu.cpp
===================================================================
--- llvm-toolchain-snapshot_10~+20191020075550+5b8546023f3.orig/clang/lib/Driver/ToolChains/Gnu.cpp
+++ llvm-toolchain-snapshot_10~+20191020075550+5b8546023f3/clang/lib/Driver/ToolChains/Gnu.cpp
@@ -578,6 +578,20 @@ void tools::gnutools::Linker::ConstructJ
 
       if (!Args.hasArg(options::OPT_nolibc))
         CmdArgs.push_back("-lc");
+       CmdArgs.push_back("-lc");
+
+      if (getToolChain().getTriple().isOSkFreeBSD()) {
+	switch (getToolChain().getArch()) {
+	case llvm::Triple::x86_64:
+	  CmdArgs.push_back("-rpath-link=/lib/x86_64-kfreebsd-gnu");
+	  break;
+	case llvm::Triple::x86:
+	  CmdArgs.push_back("-rpath-link=/lib/i386-kfreebsd-gnu");
+	  break;
+	default:
+	  break;
+	}
+      }
 
       // Add IAMCU specific libs, if needed.
       if (IsIAMCU)
@@ -1957,7 +1971,8 @@ void Generic_GCC::GCCInstallationDetecto
       "x86_64-redhat-linux",    "x86_64-suse-linux",
       "x86_64-manbo-linux-gnu", "x86_64-linux-gnu",
       "x86_64-slackware-linux", "x86_64-unknown-linux",
-      "x86_64-amazon-linux",    "x86_64-linux-android"};
+      "x86_64-amazon-linux",    "x86_64-linux-android",
+      "x86_64-kfreebsd-gnu",    "x86_64-pc-kfreebsd-gnu"};
   static const char *const X32LibDirs[] = {"/libx32"};
   static const char *const X86LibDirs[] = {"/lib32", "/lib"};
   static const char *const X86Triples[] = {
@@ -1966,7 +1981,9 @@ void Generic_GCC::GCCInstallationDetecto
       "i586-redhat-linux",    "i386-redhat-linux",     "i586-suse-linux",
       "i486-slackware-linux", "i686-montavista-linux", "i586-linux-gnu",
       "i686-linux-android",   "i386-gnu",              "i486-gnu",
-      "i586-gnu",             "i686-gnu"};
+      "i586-gnu",             "i686-gnu",
+      "i686-kfreebsd-gnu",    "i686-pc-kfreebsd-gnu",  "i486-kfreebsd-gnu",
+      "i386-kfreebsd-gnu" };
 
   static const char *const MIPSLibDirs[] = {"/lib"};
   static const char *const MIPSTriples[] = {
Index: llvm-toolchain-snapshot_10~+20191020075550+5b8546023f3/clang/lib/Driver/ToolChains/KFreeBSD.cpp
===================================================================
--- /dev/null
+++ llvm-toolchain-snapshot_10~+20191020075550+5b8546023f3/clang/lib/Driver/ToolChains/KFreeBSD.cpp
@@ -0,0 +1,458 @@
+//===--- KFreeBSD.cpp - kFreeBSD ToolChain Implementations --------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "KFreeBSD.h"
+#include "CommonArgs.h"
+#include "llvm/Support/VirtualFileSystem.h"
+#include "clang/Config/config.h"
+#include "clang/Driver/Driver.h"
+#include "clang/Driver/Options.h"
+#include "clang/Driver/SanitizerArgs.h"
+#include "llvm/Option/ArgList.h"
+#include "llvm/ProfileData/InstrProf.h"
+#include "llvm/Support/Path.h"
+
+using namespace clang::driver;
+using namespace clang::driver::toolchains;
+using namespace clang;
+using namespace llvm::opt;
+
+using tools::addPathIfExists;
+
+/// Get our best guess at the multiarch triple for a target.
+///
+/// Debian-based systems are starting to use a multiarch setup where they use
+/// a target-triple directory in the library and header search paths.
+/// Unfortunately, this triple does not align with the vanilla target triple,
+/// so we provide a rough mapping here.
+static std::string getMultiarchTriple(const Driver &D,
+                                      const llvm::Triple &TargetTriple,
+                                      StringRef SysRoot) {
+  // For most architectures, just use whatever we have rather than trying to be
+  // clever.
+  switch (TargetTriple.getArch()) {
+  default:
+    break;
+
+  // We use the existence of '/lib/<triple>' as a directory to detect
+  // some common kfreebsd triples that don't quite match the Clang
+  // triple for both 32-bit and 64-bit targets. Multiarch fixes its
+  // install triples to these regardless of what the actual target
+  // triple is.
+  case llvm::Triple::x86_64:
+    if (D.getVFS().exists(SysRoot + "/lib/x86_64-kfreebsd-gnu"))
+      return "x86_64-kfreebsd-gnu";
+    break;
+  case llvm::Triple::x86:
+    if (D.getVFS().exists(SysRoot + "/lib/i386-kfreebsd-gnu"))
+      return "i386-kfreebsd-gnu";
+    break;
+  }
+
+  return TargetTriple.str();
+}
+
+static StringRef getOSLibDir(const llvm::Triple &Triple, const ArgList &Args) {
+  // It happens that only x86 and PPC use the 'lib32' variant of oslibdir, and
+  // using that variant while targeting other architectures causes problems
+  // because the libraries are laid out in shared system roots that can't cope
+  // with a 'lib32' library search path being considered. So we only enable
+  // them when we know we may need it.
+  //
+  // FIXME: This is a bit of a hack. We should really unify this code for
+  // reasoning about oslibdir spellings with the lib dir spellings in the
+  // GCCInstallationDetector, but that is a more significant refactoring.
+
+  if (Triple.getArch() == llvm::Triple::x86)
+    return "lib";
+
+  if (Triple.getArch() == llvm::Triple::x86_64)
+    return "lib";
+
+  return Triple.isArch32Bit() ? "lib" : "lib64";
+}
+
+static void addMultilibsFilePaths(const Driver &D, const MultilibSet &Multilibs,
+                                  const Multilib &Multilib,
+                                  StringRef InstallPath,
+                                  ToolChain::path_list &Paths) {
+  if (const auto &PathsCallback = Multilibs.filePathsCallback())
+    for (const auto &Path : PathsCallback(Multilib))
+      addPathIfExists(D, InstallPath + Path, Paths);
+}
+
+kFreeBSD::kFreeBSD(const Driver &D, const llvm::Triple &Triple,
+		   const ArgList &Args)
+    : Generic_ELF(D, Triple, Args) {
+  GCCInstallation.init(Triple, Args);
+  Multilibs = GCCInstallation.getMultilibs();
+  std::string SysRoot = computeSysRoot();
+
+  // Cross-compiling binutils and GCC installations (vanilla and openSUSE at
+  // least) put various tools in a triple-prefixed directory off of the parent
+  // of the GCC installation. We use the GCC triple here to ensure that we end
+  // up with tools that support the same amount of cross compiling as the
+  // detected GCC installation. For example, if we find a GCC installation
+  // targeting x86_64, but it is a bi-arch GCC installation, it can also be
+  // used to target i386.
+  // FIXME: This seems unlikely to be Linux-, kFreeBSD- or Hurd-specific.
+  ToolChain::path_list &PPaths = getProgramPaths();
+  PPaths.push_back(Twine(GCCInstallation.getParentLibPath() + "/../" +
+                         GCCInstallation.getTriple().str() + "/bin")
+                       .str());
+
+#ifdef ENABLE_LINKER_BUILD_ID
+  ExtraOpts.push_back("--build-id");
+#endif
+
+  // The selection of paths to try here is designed to match the patterns which
+  // the GCC driver itself uses, as this is part of the GCC-compatible driver.
+  // This was determined by running GCC in a fake filesystem, creating all
+  // possible permutations of these directories, and seeing which ones it added
+  // to the link paths.
+  path_list &Paths = getFilePaths();
+
+  const std::string OSLibDir = getOSLibDir(Triple, Args);
+  const std::string MultiarchTriple = getMultiarchTriple(D, Triple, SysRoot);
+
+  // Add the multilib suffixed paths where they are available.
+  if (GCCInstallation.isValid()) {
+    const llvm::Triple &GCCTriple = GCCInstallation.getTriple();
+    const std::string &LibPath = GCCInstallation.getParentLibPath();
+    const Multilib &Multilib = GCCInstallation.getMultilib();
+    const MultilibSet &Multilibs = GCCInstallation.getMultilibs();
+
+    // Add toolchain / multilib specific file paths.
+    addMultilibsFilePaths(D, Multilibs, Multilib,
+                          GCCInstallation.getInstallPath(), Paths);
+
+    // Sourcery CodeBench MIPS toolchain holds some libraries under
+    // a biarch-like suffix of the GCC installation.
+    addPathIfExists(D, GCCInstallation.getInstallPath() + Multilib.gccSuffix(),
+                    Paths);
+
+    // GCC cross compiling toolchains will install target libraries which ship
+    // as part of the toolchain under <prefix>/<triple>/<libdir> rather than as
+    // any part of the GCC installation in
+    // <prefix>/<libdir>/gcc/<triple>/<version>. This decision is somewhat
+    // debatable, but is the reality today. We need to search this tree even
+    // when we have a sysroot somewhere else. It is the responsibility of
+    // whomever is doing the cross build targeting a sysroot using a GCC
+    // installation that is *not* within the system root to ensure two things:
+    //
+    //  1) Any DSOs that are linked in from this tree or from the install path
+    //     above must be present on the system root and found via an
+    //     appropriate rpath.
+    //  2) There must not be libraries installed into
+    //     <prefix>/<triple>/<libdir> unless they should be preferred over
+    //     those within the system root.
+    //
+    // Note that this matches the GCC behavior. See the below comment for where
+    // Clang diverges from GCC's behavior.
+    addPathIfExists(D, LibPath + "/../" + GCCTriple.str() + "/lib/../" +
+                           OSLibDir + Multilib.osSuffix(),
+                    Paths);
+
+    // If the GCC installation we found is inside of the sysroot, we want to
+    // prefer libraries installed in the parent prefix of the GCC installation.
+    // It is important to *not* use these paths when the GCC installation is
+    // outside of the system root as that can pick up unintended libraries.
+    // This usually happens when there is an external cross compiler on the
+    // host system, and a more minimal sysroot available that is the target of
+    // the cross. Note that GCC does include some of these directories in some
+    // configurations but this seems somewhere between questionable and simply
+    // a bug.
+    if (StringRef(LibPath).startswith(SysRoot)) {
+      addPathIfExists(D, LibPath + "/" + MultiarchTriple, Paths);
+      addPathIfExists(D, LibPath + "/../" + OSLibDir, Paths);
+    }
+  }
+
+  // Similar to the logic for GCC above, if we currently running Clang inside
+  // of the requested system root, add its parent library paths to
+  // those searched.
+  // FIXME: It's not clear whether we should use the driver's installed
+  // directory ('Dir' below) or the ResourceDir.
+  if (StringRef(D.Dir).startswith(SysRoot)) {
+    addPathIfExists(D, D.Dir + "/../lib/" + MultiarchTriple, Paths);
+    addPathIfExists(D, D.Dir + "/../" + OSLibDir, Paths);
+  }
+
+  addPathIfExists(D, SysRoot + "/lib/" + MultiarchTriple, Paths);
+  addPathIfExists(D, SysRoot + "/lib/../" + OSLibDir, Paths);
+
+  addPathIfExists(D, SysRoot + "/usr/lib/" + MultiarchTriple, Paths);
+  addPathIfExists(D, SysRoot + "/usr/lib/../" + OSLibDir, Paths);
+
+  // Try walking via the GCC triple path in case of biarch or multiarch GCC
+  // installations with strange symlinks.
+  if (GCCInstallation.isValid()) {
+    addPathIfExists(D,
+                    SysRoot + "/usr/lib/" + GCCInstallation.getTriple().str() +
+                        "/../../" + OSLibDir,
+                    Paths);
+
+    // Add the 'other' biarch variant path
+    Multilib BiarchSibling;
+    if (GCCInstallation.getBiarchSibling(BiarchSibling)) {
+      addPathIfExists(D, GCCInstallation.getInstallPath() +
+                             BiarchSibling.gccSuffix(),
+                      Paths);
+    }
+
+    // See comments above on the multilib variant for details of why this is
+    // included even from outside the sysroot.
+    const std::string &LibPath = GCCInstallation.getParentLibPath();
+    const llvm::Triple &GCCTriple = GCCInstallation.getTriple();
+    const Multilib &Multilib = GCCInstallation.getMultilib();
+    addPathIfExists(D, LibPath + "/../" + GCCTriple.str() + "/lib" +
+                           Multilib.osSuffix(),
+                    Paths);
+
+    // See comments above on the multilib variant for details of why this is
+    // only included from within the sysroot.
+    if (StringRef(LibPath).startswith(SysRoot))
+      addPathIfExists(D, LibPath, Paths);
+  }
+
+  // Similar to the logic for GCC above, if we are currently running Clang
+  // inside of the requested system root, add its parent library path to those
+  // searched.
+  // FIXME: It's not clear whether we should use the driver's installed
+  // directory ('Dir' below) or the ResourceDir.
+  if (StringRef(D.Dir).startswith(SysRoot))
+    addPathIfExists(D, D.Dir + "/../lib", Paths);
+
+  addPathIfExists(D, SysRoot + "/lib", Paths);
+  addPathIfExists(D, SysRoot + "/usr/lib", Paths);
+}
+
+bool kFreeBSD::HasNativeLLVMSupport() const { return true; }
+
+Tool *kFreeBSD::buildLinker() const { return new tools::gnutools::Linker(*this); }
+
+Tool *kFreeBSD::buildAssembler() const {
+  return new tools::gnutools::Assembler(*this);
+}
+
+std::string kFreeBSD::computeSysRoot() const {
+  if (!getDriver().SysRoot.empty())
+    return getDriver().SysRoot;
+
+  return std::string();
+}
+
+std::string kFreeBSD::getDynamicLinker(const ArgList &Args) const {
+  const llvm::Triple::ArchType Arch = getArch();
+
+  if (Arch == llvm::Triple::x86_64)
+    return "/lib/ld-kfreebsd-x86-64.so.1";
+
+  if (Arch == llvm::Triple::x86)
+    return "/lib/ld.so.1";
+
+  llvm_unreachable("unsupported architecture");
+}
+
+void kFreeBSD::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
+                                     ArgStringList &CC1Args) const {
+  const Driver &D = getDriver();
+  std::string SysRoot = computeSysRoot();
+
+  if (DriverArgs.hasArg(clang::driver::options::OPT_nostdinc))
+    return;
+
+  if (!DriverArgs.hasArg(options::OPT_nostdlibinc))
+    addSystemInclude(DriverArgs, CC1Args, SysRoot + "/usr/local/include");
+
+  if (!DriverArgs.hasArg(options::OPT_nobuiltininc)) {
+    SmallString<128> P(D.ResourceDir);
+    llvm::sys::path::append(P, "include");
+    addSystemInclude(DriverArgs, CC1Args, P);
+  }
+
+  if (DriverArgs.hasArg(options::OPT_nostdlibinc))
+    return;
+
+  // Check for configure-time C include directories.
+  StringRef CIncludeDirs(C_INCLUDE_DIRS);
+  if (CIncludeDirs != "") {
+    SmallVector<StringRef, 5> dirs;
+    CIncludeDirs.split(dirs, ":");
+    for (StringRef dir : dirs) {
+      StringRef Prefix =
+          llvm::sys::path::is_absolute(dir) ? StringRef(SysRoot) : "";
+      addExternCSystemInclude(DriverArgs, CC1Args, Prefix + dir);
+    }
+    // addExternCSystemInclude(DriverArgs, CC1Args, SysRoot + "/usr/include");
+    return;
+  }
+
+  // Lacking those, try to detect the correct set of system includes for the
+  // target triple.
+
+  // Add include directories specific to the selected multilib set and multilib.
+  if (GCCInstallation.isValid()) {
+    const auto &Callback = Multilibs.includeDirsCallback();
+    if (Callback) {
+      for (const auto &Path : Callback(GCCInstallation.getMultilib()))
+        addExternCSystemIncludeIfExists(
+            DriverArgs, CC1Args, GCCInstallation.getInstallPath() + Path);
+    }
+  }
+
+  // Implement generic Debian multiarch support.
+  const StringRef X86_64MultiarchIncludeDirs[] = {
+      "/usr/include/x86_64-kfreebsd-gnu"};
+
+  // CHECK
+  const StringRef X86MultiarchIncludeDirs[] = {
+      "/usr/include/i386-kfreebsd-gnu"};
+
+  ArrayRef<StringRef> MultiarchIncludeDirs;
+  switch (getTriple().getArch()) {
+  case llvm::Triple::x86:
+    MultiarchIncludeDirs = X86MultiarchIncludeDirs;
+    break;
+  case llvm::Triple::x86_64:
+    MultiarchIncludeDirs = X86_64MultiarchIncludeDirs;
+    break;
+  default:
+    break;
+  }
+
+  for (StringRef Dir : MultiarchIncludeDirs) {
+    if (D.getVFS().exists(SysRoot + Dir)) {
+      addExternCSystemInclude(DriverArgs, CC1Args, SysRoot + Dir);
+      break;
+    }
+  }
+
+  // Add an include of '/include' directly. This isn't provided by default by
+  // system GCCs, but is often used with cross-compiling GCCs, and harmless to
+  // add even when Clang is acting as-if it were a system compiler.
+  addExternCSystemInclude(DriverArgs, CC1Args, SysRoot + "/include");
+
+  addExternCSystemInclude(DriverArgs, CC1Args, SysRoot + "/usr/include");
+}
+
+static std::string DetectLibcxxIncludePath(StringRef base) {
+  std::error_code EC;
+  int MaxVersion = 0;
+  std::string MaxVersionString = "";
+  for (llvm::sys::fs::directory_iterator LI(base, EC), LE; !EC && LI != LE;
+       LI = LI.increment(EC)) {
+    StringRef VersionText = llvm::sys::path::filename(LI->path());
+    int Version;
+    if (VersionText[0] == 'v' &&
+        !VersionText.slice(1, StringRef::npos).getAsInteger(10, Version)) {
+      if (Version > MaxVersion) {
+        MaxVersion = Version;
+        MaxVersionString = VersionText;
+      }
+    }
+  }
+  return MaxVersion ? (base + "/" + MaxVersionString).str() : "";
+}
+
+void kFreeBSD::addLibCxxIncludePaths(const llvm::opt::ArgList &DriverArgs,
+                                 llvm::opt::ArgStringList &CC1Args) const {
+  const std::string& SysRoot = computeSysRoot();
+  const std::string LibCXXIncludePathCandidates[] = {
+      DetectLibcxxIncludePath(getDriver().ResourceDir + "/include/c++"),
+      DetectLibcxxIncludePath(getDriver().Dir + "/../include/c++"),
+      // If this is a development, non-installed, clang, libcxx will
+      // not be found at ../include/c++ but it likely to be found at
+      // one of the following two locations:
+      DetectLibcxxIncludePath(SysRoot + "/usr/local/include/c++"),
+      DetectLibcxxIncludePath(SysRoot + "/usr/include/c++") };
+  for (const auto &IncludePath : LibCXXIncludePathCandidates) {
+    if (IncludePath.empty() || !getVFS().exists(IncludePath))
+      continue;
+    // Use the first candidate that exists.
+    addSystemInclude(DriverArgs, CC1Args, IncludePath);
+    return;
+  }
+}
+
+void kFreeBSD::addLibStdCxxIncludePaths(const llvm::opt::ArgList &DriverArgs,
+                                    llvm::opt::ArgStringList &CC1Args) const {
+  // We need a detected GCC installation on kFreeBSD to provide libstdc++'s
+  // headers.
+  if (!GCCInstallation.isValid())
+    return;
+
+  // By default, look for the C++ headers in an include directory adjacent to
+  // the lib directory of the GCC installation. Note that this is expect to be
+  // equivalent to '/usr/include/c++/X.Y' in almost all cases.
+  StringRef LibDir = GCCInstallation.getParentLibPath();
+  StringRef InstallDir = GCCInstallation.getInstallPath();
+  StringRef TripleStr = GCCInstallation.getTriple().str();
+  const Multilib &Multilib = GCCInstallation.getMultilib();
+  const std::string GCCMultiarchTriple = getMultiarchTriple(
+      getDriver(), GCCInstallation.getTriple(), getDriver().SysRoot);
+  const std::string TargetMultiarchTriple =
+      getMultiarchTriple(getDriver(), getTriple(), getDriver().SysRoot);
+  const GCCVersion &Version = GCCInstallation.getVersion();
+
+  // The primary search for libstdc++ supports multiarch variants.
+  if (addLibStdCXXIncludePaths(LibDir.str() + "/../include",
+                               "/c++/" + Version.Text, TripleStr,
+                               GCCMultiarchTriple, TargetMultiarchTriple,
+                               Multilib.includeSuffix(), DriverArgs, CC1Args))
+    return;
+
+  // Otherwise, fall back on a bunch of options which don't use multiarch
+  // layouts for simplicity.
+  const std::string LibStdCXXIncludePathCandidates[] = {
+      // Gentoo is weird and places its headers inside the GCC install,
+      // so if the first attempt to find the headers fails, try these patterns.
+      InstallDir.str() + "/include/g++-v" + Version.Text,
+      InstallDir.str() + "/include/g++-v" + Version.MajorStr + "." +
+          Version.MinorStr,
+      InstallDir.str() + "/include/g++-v" + Version.MajorStr,
+      // Android standalone toolchain has C++ headers in yet another place.
+      LibDir.str() + "/../" + TripleStr.str() + "/include/c++/" + Version.Text,
+      // Freescale SDK C++ headers are directly in <sysroot>/usr/include/c++,
+      // without a subdirectory corresponding to the gcc version.
+      LibDir.str() + "/../include/c++",
+  };
+
+  for (const auto &IncludePath : LibStdCXXIncludePathCandidates) {
+    if (addLibStdCXXIncludePaths(IncludePath, /*Suffix*/ "", TripleStr,
+                                 /*GCCMultiarchTriple*/ "",
+                                 /*TargetMultiarchTriple*/ "",
+                                 Multilib.includeSuffix(), DriverArgs, CC1Args))
+      break;
+  }
+}
+
+/* FIXME:
+/home/srs/DEBs/llvm-toolchain-7/llvm-toolchain-7-7.0.1~+rc2-7/clang/lib/Driver/ToolChains/KFreeBSD.cpp:431:15: error: no declaration matches ‘clang::SanitizerMask clang::driver::toolchains::kFreeBSD::getSupportedSanitizers() const’
+ SanitizerMask kFreeBSD::getSupportedSanitizers() const {
+*/
+SanitizerMask kFreeBSD::getSupportedSanitizers() const {
+  const bool IsX86 = getTriple().getArch() == llvm::Triple::x86;
+  const bool IsX86_64 = getTriple().getArch() == llvm::Triple::x86_64;
+  SanitizerMask Res = ToolChain::getSupportedSanitizers();
+  // FIXME: Add here!!
+  if (IsX86_64) {
+    Res |= SanitizerKind::DataFlow;
+    Res |= SanitizerKind::Leak;
+    Res |= SanitizerKind::Thread;
+    Res |= SanitizerKind::Scudo;
+    Res |= SanitizerKind::HWAddress;
+    Res |= SanitizerKind::KernelHWAddress;
+  }
+  if (IsX86 || IsX86_64)
+    Res |= SanitizerKind::Function;
+
+  return Res;
+}
+
Index: llvm-toolchain-snapshot_10~+20191020075550+5b8546023f3/clang/lib/Driver/ToolChains/KFreeBSD.h
===================================================================
--- /dev/null
+++ llvm-toolchain-snapshot_10~+20191020075550+5b8546023f3/clang/lib/Driver/ToolChains/KFreeBSD.h
@@ -0,0 +1,54 @@
+//===--- KFreeBSD.h - kFreeBSD ToolChain Implementations ----------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_LIB_DRIVER_TOOLCHAINS_KFreeBSD_H
+#define LLVM_CLANG_LIB_DRIVER_TOOLCHAINS_KFreeBSD_H
+
+#include "Gnu.h"
+#include "clang/Driver/ToolChain.h"
+
+namespace clang {
+namespace driver {
+namespace toolchains {
+
+class LLVM_LIBRARY_VISIBILITY kFreeBSD : public Generic_ELF {
+public:
+  kFreeBSD(const Driver &D, const llvm::Triple &Triple,
+          const llvm::opt::ArgList &Args);
+
+  bool HasNativeLLVMSupport() const override;
+
+  void
+  AddClangSystemIncludeArgs(const llvm::opt::ArgList &DriverArgs,
+                            llvm::opt::ArgStringList &CC1Args) const override;
+  void addLibCxxIncludePaths(
+      const llvm::opt::ArgList &DriverArgs,
+      llvm::opt::ArgStringList &CC1Args) const override;
+  void addLibStdCxxIncludePaths(
+      const llvm::opt::ArgList &DriverArgs,
+      llvm::opt::ArgStringList &CC1Args) const override;
+
+  SanitizerMask getSupportedSanitizers() const override;
+
+  virtual std::string computeSysRoot() const;
+
+  virtual std::string getDynamicLinker(const llvm::opt::ArgList &Args) const;
+
+  std::vector<std::string> ExtraOpts;
+
+protected:
+  Tool *buildAssembler() const override;
+  Tool *buildLinker() const override;
+};
+
+} // end namespace toolchains
+} // end namespace driver
+} // end namespace clang
+
+#endif // LLVM_CLANG_LIB_DRIVER_TOOLCHAINS_KFreeBSD_H