embed-scm.scm

(import (chicken platform) (chicken foreign))

(define-external (scheme_test (int x)) int
  (* x 2))

;; necessary to return to C after CHICKEN_run
(return-to-host)


===============
embed-c.c

#include <stdio.h>
#include <chicken.h>

int  scheme_test(int t0);

int main() {
    CHICKEN_run(C_toplevel);
    printf("scheme_test(21) = %d\n", scheme_test(21));
    return 0;
}

===============
Build and run:

csc -ce embed-scm.scm 

# using csc here for include dirs and linker options, but you can use your C compiler with the necessary options as well.
csc embed-c.c embed-scm.o
./embed-c