Index: include/clang/Frontend/FrontendAction.h
===================================================================
--- include/clang/Frontend/FrontendAction.h
+++ include/clang/Frontend/FrontendAction.h
@@ -305,6 +305,7 @@
   std::unique_ptr<FrontendAction> WrappedAction;
 
 protected:
+  bool PrepareToExecuteAction(CompilerInstance &CI) override;
   std::unique_ptr<ASTConsumer> CreateASTConsumer(CompilerInstance &CI,
                                                  StringRef InFile) override;
   bool BeginInvocation(CompilerInstance &CI) override;
Index: lib/Frontend/FrontendAction.cpp
===================================================================
--- lib/Frontend/FrontendAction.cpp
+++ lib/Frontend/FrontendAction.cpp
@@ -1045,6 +1045,9 @@
   llvm_unreachable("Invalid CreateASTConsumer on preprocessor action!");
 }
 
+bool WrapperFrontendAction::PrepareToExecuteAction(CompilerInstance &CI) {
+  return WrappedAction->PrepareToExecuteAction(CI);
+}
 std::unique_ptr<ASTConsumer>
 WrapperFrontendAction::CreateASTConsumer(CompilerInstance &CI,
                                          StringRef InFile) {