autoconf-current-defun-function
autoconf-current-defun-function is a compiled Lisp function in `autoconf.el
'.
(autoconf-current-defun-function)
Function to use for `add-log-current-defun-function' in Autoconf mode.
This version looks back for an AC_DEFINE or AC_SUBST. It will stop
searching backwards at another AC_... command.