🚀 go-pugleaf

(in the emacs version 18.52.12 on berkeley-unix).

It inserts a space before the comment start string when comment-column
is 0.  I think c-comment-indent is only called from indent-for-comment,
but anyway, if you use indent-new-comment-line (M-j) in a comment that 
starts at the beginning of a line, the new comment line is indented one
space.  This space can easily be removed by <tab>, of course, but the 
real fix goes like this:

;;; old code (in c-mode.el)
(defun c-comment-indent ()
  (if (looking-at "^/\\*")
      0				;Existing comment at bol stays there.
    (save-excursion
      (skip-chars-backward " \t")
      (max (1+ (current-column))	;Else indent at comment column
	   comment-column))))	; except leave at least one space.

;;; fixed code
(defun c-comment-indent ()
  (if (looking-at "^/\\*")
      0					; Existing comment at bol stays there.
    (save-excursion
      (skip-chars-backward " \t")
      (if (bolp)			; <= fixed here:
	  comment-column		; no extra space at beginning of line
	(max (1+ (current-column))	; Else indent at comment column
	     comment-column)))))	; except leave at least one space.


Sorry if you all knew that already.