[pjb@despina org.macports:0 src]$ sbcl --noinform --non-interactive --no-userinit --eval '(compile-file "/tmp/main.lisp")'
; compiling file "/private/tmp/main.lisp" (written 08 DEC 2018 01:11:11 AM):
; compiling file "/private/tmp/hello.lisp" (written 08 DEC 2018 01:10:27 AM):
; compiling (DEFPARAMETER HELLO ...)

; /private/tmp/hello.fasl written
; compilation finished in 0:00:00.002
; compiling (LOAD (MERGE-PATHNAMES "hello" ...))
; compiling (FORMAT T ...)
; compiling (FINISH-OUTPUT)

; /tmp/main.fasl written
; compilation finished in 0:00:00.007
[pjb@despina org.macports:0 src]$ sbcl --noinform --non-interactive --no-userinit --eval '(compile-file "/tmp/hello.lisp")'
; compiling file "/private/tmp/hello.lisp" (written 08 DEC 2018 01:10:27 AM):
; compiling (DEFPARAMETER HELLO ...)

; /tmp/hello.fasl written
; compilation finished in 0:00:00.002
[pjb@despina org.macports:0 src]$ sbcl --noinform --non-interactive --no-userinit --load /tmp/main
Hello World!
[pjb@despina org.macports:0 src]$ cat /tmp/hello.lisp
(defparameter hello "Hello World!")
[pjb@despina org.macports:0 src]$ cat /tmp/main.lisp

(eval-when (:compile-toplevel)
  (load (compile-file (merge-pathnames "hello" *compile-file-truename*))))

(eval-when (:load-toplevel :execute)
  ;; Assume hello has already been compiled
  (load (merge-pathnames "hello" *load-truename*)))

(format t "~A~%" hello)
(finish-output)
[pjb@despina org.macports:0 src]$