command-switch-alist

command-switch-alist is a variable defined in `startup.el'.
Its value is

(("-compiler" . vhdl-process-command-line-option)
 ("-project" . vhdl-process-command-line-option))

Documentation:
Alist of command-line switches.
Elements look like (SWITCH-STRING . HANDLER-FUNCTION).
HANDLER-FUNCTION receives the switch string as its sole argument;
the remaining command-line args are in the variable `command-line-args-left'.