Is there a way to make longlines mode the default for just the *compilation* buffer?
There sure is; you add to the compilation-mode-hook, which is called any time you enter compilation mode, a function which sets longlines-mode. Add the following to your
~/.emacs, or some other such suitable place:
(defun compilation-mode-longlines-hook () "Set longlines-mode when entering compilation mode." (longlines-mode t)) (add-hook 'compilation-mode-hook 'compilation-mode-longlines-hook)