Variable: compilation-first-column
compilation-first-column is a variable defined in compile.el.gz.
Value
1
Documentation
This is how compilers number the first column, usually 1 or 0.
If this is buffer-local in the destination buffer, Emacs obeys that value, otherwise it uses the value in the *compilation* buffer. This enables a major mode to specify its own value.
Probably introduced at or before Emacs version 24.1.
Source Code
;; Defined in /usr/src/emacs/lisp/progmodes/compile.el.gz
(defvar compilation-first-column 1
"This is how compilers number the first column, usually 1 or 0.
If this is buffer-local in the destination buffer, Emacs obeys
that value, otherwise it uses the value in the *compilation*
buffer. This enables a major mode to specify its own value.")