1 files changed, 15 insertions, 2 deletions
diff --git a/include/clang/Sema/ExternalSemaSource.h b/include/clang/Sema/ExternalSemaSource.h
index 325abdf..c0ef712 100644
--- a/include/clang/Sema/ExternalSemaSource.h
+++ b/include/clang/Sema/ExternalSemaSource.h
@@ -10,8 +10,8 @@
 //  This file defines the ExternalSemaSource interface.
 //
 //===----------------------------------------------------------------------===//
-#ifndef LLVM_CLANG_SEMA_EXTERNAL_SEMA_SOURCE_H
-#define LLVM_CLANG_SEMA_EXTERNAL_SEMA_SOURCE_H
+#ifndef LLVM_CLANG_SEMA_EXTERNALSEMASOURCE_H
+#define LLVM_CLANG_SEMA_EXTERNALSEMASOURCE_H
 
 #include "clang/AST/ExternalASTSource.h"
 #include "clang/AST/Type.h"
@@ -20,6 +20,10 @@
 #include "llvm/ADT/MapVector.h"
 #include <utility>
 
+namespace llvm {
+template <class T, unsigned n> class SmallSetVector;
+}
+
 namespace clang {
 
 class CXXConstructorDecl;
@@ -132,6 +136,15 @@ public:
   /// introduce the same declarations repeatedly.
   virtual void ReadDynamicClasses(SmallVectorImpl<CXXRecordDecl *> &Decls) {}
 
+  /// \brief Read the set of potentially unused typedefs known to the source.
+  ///
+  /// The external source should append its own potentially unused local
+  /// typedefs to the given vector of declarations. Note that this routine may
+  /// be invoked multiple times; the external source should take care not to
+  /// introduce the same declarations repeatedly.
+  virtual void ReadUnusedLocalTypedefNameCandidates(
+      llvm::SmallSetVector<const TypedefNameDecl *, 4> &Decls) {};
+
   /// \brief Read the set of locally-scoped external declarations known to the
   /// external Sema source.
   ///