Add first pieces of support for parsing and representing 
extern "C" in C++ mode.  Patch by Mike Stump!


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@45904 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/Sema/Sema.h b/Sema/Sema.h
index ef20829..3ab8be7 100644
--- a/Sema/Sema.h
+++ b/Sema/Sema.h
@@ -192,6 +192,9 @@
   virtual void ObjCActOnStartOfMethodDef(Scope *S, DeclTy *D);
   
   virtual DeclTy *ActOnFinishFunctionBody(DeclTy *Decl, StmtTy *Body);
+  virtual DeclTy *ActOnLinkageSpec(SourceLocation Loc, SourceLocation LBrace,
+				   SourceLocation RBrace, const char *Lang,
+				   unsigned StrSize, DeclTy *D);
   
   /// Scope actions.
   virtual void ActOnPopScope(SourceLocation Loc, Scope *S);