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Date: Mon, 14 Dec 2009 22:59:57 -0800
From: Robert Roessler <roessler@rftp.com>
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To: Aaron Bohannon <bohannon@cis.upenn.edu>
Cc: OCaml List <caml-list@yquem.inria.fr>
Subject: Re: [Caml-list] linking errors involving cpp files
References: <c413fcb70912142109s39a01f6epd4c07ed31e0a0635@mail.gmail.com>
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X-Spam: no; 0.00; cpp:01 ocaml:01 ocaml:01 cpp:01 mlvalues:01 argc:01 argv:01 argv:01 argc:01 char:01 char:01 wrote:01 caml-list:01 undefined:01 int:01 

Aaron Bohannon wrote:
> How do I link C++ code with OCaml?  Let's say I have a main program in
> C/C++ and a function I want to call in OCaml:
>
> ---- main.c / main.cpp ---
> #include<caml/mlvalues.h>
> #include<caml/memory.h>
> #include<caml/callback.h>
> int main (int argc, char ** argv) {
>    char * caml_argv[argc + 1];
>    int i;
>    for (i = 0; i<  argc + 1; i++) caml_argv[i] = argv[i];
>    caml_argv[argc] = NULL;
>    caml_main (caml_argv);
>    return 0;
> }
> --------
>...
> ---then I get this:
>
> Undefined symbols:

You might try (when mixing C++ and OCaml) wrapping the whole thing in an 
'extern "C" {...}' block (*including* the #includes and the entire main 
function).

Robert Roessler