Change Emacs Default Coding System

Question

My problem stems from Emacs inserting the coding system headers into source files containing non-ascii characters:

# -*- coding: utf-8 -*-

My c

Answer 1

This works for me:

(setq ruby-insert-encoding-magic-comment nil)

As suggested here

I believe you're correct that it only happens in ruby-mode. It seems ruby-mode is trying to be helpful by adding the line, which makes Ruby detect the source file encoding automatically.