Compiling C lib and OCaml exe using it, all using ocamlfind
- by Magnus
I'm trying to work out how to use ocamlfind to compile a C library and an OCaml executable using that C library.
I put together a set of rather silly example files.
% cat sillystubs.c
#include <stdio.h>
#include <caml/mlvalues.h>
#include <caml/memory.h>
#include <caml/alloc.h>
#include <caml/custom.h>
value
caml_silly_silly( value unit )
{
CAMLparam1( unit );
printf( "%s\n", __FILE__ );
CAMLreturn( Val_unit );
}
% cat silly.mli
external silly : unit -> unit = "silly_silly"
% cat foo.ml
open Silly
open String
let _ =
print_string "About to call into silly";
silly ();
print_string "Called into silly"
I believe the following is the way to compile up the library:
% ocamlfind ocamlc -c sillystubs.c
% ar rc libsillystubs.a sillystubs.o
% ocamlfind ocamlc -c silly.mli
% ocamlfind ocmalc -a -o silly.cma -ccopt -L${PWD} -cclib -lsillystubs
Now I don't seem to be able to use the created library though:
% ocamlfind ocamlc -custom -o foo foo.cmo silly.cma
/usr/bin/ld: cannot find -lsillystubs
collect2: ld returned 1 exit status
File "_none_", line 1, characters 0-1:
Error: Error while building custom runtime system
The OCaml tools are somewhat mysterious to me, so any pointers would be most welcome.
