Re: [Caml-list] OCaml/C interface

[Julien Moutinho <julien.moutinho@gmail.com>]

On Thu, Oct 25, 2007 at 03:17:43PM -0700, Nathan Mishra Linger wrote:
> Having just read Chapter 18 of the manual regarding "Interfacing C with
> OCaml", I wrote a simple program to test my understanding.  However, when I
> try to compile it I run into some undefined symbol problems (_tgetent,
> _tgetnum, etc).  My machine is a PowerPC iBook G4 running OS X 10.4.10.
> 
> Does anyone know how to fix this?  After Googling around, I think this is a
> Mac problem rather than an OCaml one, but I thought people on this list
> might have come up against this same problem.  Also, any comments on my C
> code that calls OCaml would be appreciated.

A solution may be:

% ls
Makefile Makefile.old test.c test.c.old test.ml

% diff -U 0 Makefile.old Makefile
--- Makefile.old        2007-10-26 11:07:41.000000000 +0200
+++ Makefile    2007-10-26 11:11:34.000000000 +0200
@@ -5 +5 @@
-       cc -o myprog test.o camlcode.o -L/usr/local/lib/ocaml -lcamlrun
+       cc -o myprog test.o camlcode.o -L/usr/local/lib/ocaml -lcamlrun -lm -lcurses

% diff -u test.c.old test.c
--- test.c.old  2007-10-26 11:06:33.000000000 +0200
+++ test.c      2007-10-26 11:02:42.000000000 +0200
@@ -25,9 +25,10 @@
 int main() {
   CAMLlocal1(xs);
   char* argv[]  = {"yo"};
-  caml_main(argv);
+  caml_startup(argv);
   xs = up_to(5);
   gc();
   printf("sum of [1..5] = %i\n", sum(xs));
+  return EXIT_SUCCESS;
 }

% make
ocamlc -c test.ml
cc -I/usr/local/lib/ocaml -c test.c
ocamlc -output-obj -o camlcode.o test.cmo
cc -o myprog test.o camlcode.o -L/usr/local/lib/ocaml -lcamlrun -lm -lcurses

% ./myprog
sum of [1..5] = 15

HTH,
  Julien.