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diff --git a/clang-tools-extra/clang-tidy/fuchsia/MultipleInheritanceCheck.h b/clang-tools-extra/clang-tidy/fuchsia/MultipleInheritanceCheck.h
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+++ b/clang-tools-extra/clang-tidy/fuchsia/MultipleInheritanceCheck.h
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+//===--- MultipleInheritanceCheck.h - clang-tidy-----------------*- 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_TOOLS_EXTRA_CLANG_TIDY_FUCHSIA_MULTIPLE_INHERITANCE_H
+#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_FUCHSIA_MULTIPLE_INHERITANCE_H
+
+#include "../ClangTidy.h"
+
+namespace clang {
+namespace tidy {
+namespace fuchsia {
+
+/// Mulitple implementation inheritance is discouraged.
+///
+/// For the user-facing documentation see:
+/// http://clang.llvm.org/extra/clang-tidy/checks/fuchsia-multiple-inheritance.html
+class MultipleInheritanceCheck : public ClangTidyCheck {
+public:
+  MultipleInheritanceCheck(StringRef Name, ClangTidyContext *Context)
+      : ClangTidyCheck(Name, Context) {}
+  void registerMatchers(ast_matchers::MatchFinder *Finder) override;
+  void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
+
+  void onEndOfTranslationUnit() override { InterfaceMap.clear(); }
+
+private:
+  void addNodeToInterfaceMap(const CXXRecordDecl *Node, bool isInterface);
+  bool getInterfaceStatus(const CXXRecordDecl *Node, bool &isInterface) const;
+  bool isCurrentClassInterface(const CXXRecordDecl *Node) const;
+  bool isInterface(const CXXRecordDecl *Node);
+
+  // Contains the identity of each named CXXRecord as an interface.  This is
+  // used to memoize lookup speeds and improve performance from O(N^2) to O(N),
+  // where N is the number of classes.
+  llvm::StringMap<bool> InterfaceMap;
+};
+
+} // namespace fuchsia
+} // namespace tidy
+} // namespace clang
+
+#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_FUCHSIA_MULTIPLE_INHERITANCE_H