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diff --git a/clang-r353983/include/clang/Driver/Multilib.h b/clang-r353983/include/clang/Driver/Multilib.h
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+++ b/clang-r353983/include/clang/Driver/Multilib.h
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+//===- Multilib.h -----------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_DRIVER_MULTILIB_H
+#define LLVM_CLANG_DRIVER_MULTILIB_H
+
+#include "clang/Basic/LLVM.h"
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/Compiler.h"
+#include <cassert>
+#include <functional>
+#include <string>
+#include <utility>
+#include <vector>
+
+namespace clang {
+namespace driver {
+
+/// This corresponds to a single GCC Multilib, or a segment of one controlled
+/// by a command line flag
+class Multilib {
+public:
+  using flags_list = std::vector<std::string>;
+
+private:
+  std::string GCCSuffix;
+  std::string OSSuffix;
+  std::string IncludeSuffix;
+  flags_list Flags;
+
+public:
+  Multilib(StringRef GCCSuffix = {}, StringRef OSSuffix = {},
+           StringRef IncludeSuffix = {});
+
+  /// Get the detected GCC installation path suffix for the multi-arch
+  /// target variant. Always starts with a '/', unless empty
+  const std::string &gccSuffix() const {
+    assert(GCCSuffix.empty() ||
+           (StringRef(GCCSuffix).front() == '/' && GCCSuffix.size() > 1));
+    return GCCSuffix;
+  }
+
+  /// Set the GCC installation path suffix.
+  Multilib &gccSuffix(StringRef S);
+
+  /// Get the detected os path suffix for the multi-arch
+  /// target variant. Always starts with a '/', unless empty
+  const std::string &osSuffix() const {
+    assert(OSSuffix.empty() ||
+           (StringRef(OSSuffix).front() == '/' && OSSuffix.size() > 1));
+    return OSSuffix;
+  }
+
+  /// Set the os path suffix.
+  Multilib &osSuffix(StringRef S);
+
+  /// Get the include directory suffix. Always starts with a '/', unless
+  /// empty
+  const std::string &includeSuffix() const {
+    assert(IncludeSuffix.empty() ||
+           (StringRef(IncludeSuffix).front() == '/' && IncludeSuffix.size() > 1));
+    return IncludeSuffix;
+  }
+
+  /// Set the include directory suffix
+  Multilib &includeSuffix(StringRef S);
+
+  /// Get the flags that indicate or contraindicate this multilib's use
+  /// All elements begin with either '+' or '-'
+  const flags_list &flags() const { return Flags; }
+  flags_list &flags() { return Flags; }
+
+  /// Add a flag to the flags list
+  /// \p Flag must be a flag accepted by the driver with its leading '-' removed,
+  ///     and replaced with either:
+  ///       '-' which contraindicates using this multilib with that flag
+  ///     or:
+  ///       '+' which promotes using this multilib in the presence of that flag
+  ///     otherwise '-print-multi-lib' will not emit them correctly.
+  Multilib &flag(StringRef F) {
+    assert(F.front() == '+' || F.front() == '-');
+    Flags.push_back(F);
+    return *this;
+  }
+
+  LLVM_DUMP_METHOD void dump() const;
+  /// print summary of the Multilib
+  void print(raw_ostream &OS) const;
+
+  /// Check whether any of the 'against' flags contradict the 'for' flags.
+  bool isValid() const;
+
+  /// Check whether the default is selected
+  bool isDefault() const
+  { return GCCSuffix.empty() && OSSuffix.empty() && IncludeSuffix.empty(); }
+
+  bool operator==(const Multilib &Other) const;
+};
+
+raw_ostream &operator<<(raw_ostream &OS, const Multilib &M);
+
+class MultilibSet {
+public:
+  using multilib_list = std::vector<Multilib>;
+  using iterator = multilib_list::iterator;
+  using const_iterator = multilib_list::const_iterator;
+  using IncludeDirsFunc =
+      std::function<std::vector<std::string>(const Multilib &M)>;
+  using FilterCallback = llvm::function_ref<bool(const Multilib &)>;
+
+private:
+  multilib_list Multilibs;
+  IncludeDirsFunc IncludeCallback;
+  IncludeDirsFunc FilePathsCallback;
+
+public:
+  MultilibSet() = default;
+
+  /// Add an optional Multilib segment
+  MultilibSet &Maybe(const Multilib &M);
+
+  /// Add a set of mutually incompatible Multilib segments
+  MultilibSet &Either(const Multilib &M1, const Multilib &M2);
+  MultilibSet &Either(const Multilib &M1, const Multilib &M2,
+                      const Multilib &M3);
+  MultilibSet &Either(const Multilib &M1, const Multilib &M2,
+                      const Multilib &M3, const Multilib &M4);
+  MultilibSet &Either(const Multilib &M1, const Multilib &M2,
+                      const Multilib &M3, const Multilib &M4,
+                      const Multilib &M5);
+  MultilibSet &Either(ArrayRef<Multilib> Ms);
+
+  /// Filter out some subset of the Multilibs using a user defined callback
+  MultilibSet &FilterOut(FilterCallback F);
+
+  /// Filter out those Multilibs whose gccSuffix matches the given expression
+  MultilibSet &FilterOut(const char *Regex);
+
+  /// Add a completed Multilib to the set
+  void push_back(const Multilib &M);
+
+  /// Union this set of multilibs with another
+  void combineWith(const MultilibSet &MS);
+
+  /// Remove all of the multilibs from the set
+  void clear() { Multilibs.clear(); }
+
+  iterator begin() { return Multilibs.begin(); }
+  const_iterator begin() const { return Multilibs.begin(); }
+
+  iterator end() { return Multilibs.end(); }
+  const_iterator end() const { return Multilibs.end(); }
+
+  /// Pick the best multilib in the set, \returns false if none are compatible
+  bool select(const Multilib::flags_list &Flags, Multilib &M) const;
+
+  unsigned size() const { return Multilibs.size(); }
+
+  LLVM_DUMP_METHOD void dump() const;
+  void print(raw_ostream &OS) const;
+
+  MultilibSet &setIncludeDirsCallback(IncludeDirsFunc F) {
+    IncludeCallback = std::move(F);
+    return *this;
+  }
+
+  const IncludeDirsFunc &includeDirsCallback() const { return IncludeCallback; }
+
+  MultilibSet &setFilePathsCallback(IncludeDirsFunc F) {
+    FilePathsCallback = std::move(F);
+    return *this;
+  }
+
+  const IncludeDirsFunc &filePathsCallback() const { return FilePathsCallback; }
+
+private:
+  /// Apply the filter to Multilibs and return the subset that remains
+  static multilib_list filterCopy(FilterCallback F, const multilib_list &Ms);
+
+  /// Apply the filter to the multilib_list, removing those that don't match
+  static void filterInPlace(FilterCallback F, multilib_list &Ms);
+};
+
+raw_ostream &operator<<(raw_ostream &OS, const MultilibSet &MS);
+
+} // namespace driver
+} // namespace clang
+
+#endif // LLVM_CLANG_DRIVER_MULTILIB_H