只需要看一个例子都明白了。
% uname -a
Linux bailey 1.2.13 #2 Wed Aug 28 16:29:41 GMT 1996 i586
% cat m1.c
int power_of_2 (int x) { return 1<<x; }
% cat m2.scm
(c-declare "extern int power_of_2 ();")
(define pow2 (c-lambda (int) int "power_of_2"))
(define (twice x) (cons x x))
% cat m3.scm
(write (map twice (map pow2 '(1 2 3 4)))) (newline)
% gsc -c m2.scm # create m2.c (note: .scm is optional)
% gsc -c m3.scm # create m3.c (note: .scm is optional)
% gsc m2.c m3.c # create the incremental link file m3_.c
% gcc m1.c m2.c m3.c m3_.c -lgambc
% a.out
((2 . 2) (4 . 4) (8 . 8) (16 . 16))