How can I make emacs highlight lines that go over 80 chars?

Question

I know there are solutions to making emacs show the 80 line column, but I don\'t want that sort of visual disturbance. I\'d just like to make it highlight a line if it\'s ov

Answer 1

Here's my config from Emacs Dev Kit:

;; whitespace-mode
;; free of trailing whitespace and to use 80-column width, standard indentation
(setq whitespace-style '(trailing lines space-before-tab
                                  indentation space-after-tab)
      whitespace-line-column 80)

Basically you need just the last bit, but I find the other settings quite useful (I hate tabs and trailing whitespaces).