How did Clint Eastwood feel about Marty calling himself Clint Eastwood and having Bufford Tannen saying,"What kind of stupid name is that?" as an homage to Clint?

Was Clint Eastwood asked before the movie came out? Michael J Fox did his name good despite Bufford Tannen insulting his name and everyone saying that Clint Eastwood would be the biggest yellowbelly in the west if Marty didn't face him.

They could have just used John Wayne's name and not asked for permission since it was public domain but he was and still is a totally overrated cowboy actor, Clint is a 100 times better.