Problem using camlp4o on windows.

Problem using camlp4o on windows.

[Ed Keith]

I am trying to learn to use camlp4. I started by working my way through the tutorial at http://www.ocaml-tutorial.org/camlp4_3.10/foreach_tutorial

I created the file :

   open Camlp4.PreCast
   open Syntax

   EXTEND Gram
     expr: LEVEL "top"
       [ [ "for"; v = a_LIDENT; "in"; m = a_UIDENT; e = expr; "do";
           seq = sequence; "done" ->
             <:expr< $uid:m$.iter (fun $lid:v$ -> $seq$) $e$ >>
         ] ]
     ;
   END

and complied it with the command line:

    C:\Documents and Settings\Ed Keith\My Documents\playpen\ocaml>ocamlc -I +camlp4 camlp4lib.cma -pp camlp4orf -c pa_foreach.ml

So far so good. Then I ran into the following problem when I tried to use it. Here is the result: 

  C:\Documents and Settings\Ed Keith\My Documents\playpen\ocaml>ocaml
        Objective Caml version 3.11.0

  # #load "camlp4o.cma";;
  Characters -1--1:
    #load "camlp4o.cma";;

  Error: Reference to undefined global `Dynlink'
  # exit 0;;

I have searched the web and I am beginning to suspect that I can not use camlp4 on a windows system, is this the case? 

If so I can move to a Linux box, but if I can not use it to generate portable code it will not be very useful for me to learn it.

    -EdK


Ed Keith
e_d_k@yahoo.com

Blog: edkeith.blogspot.com



      

Re : [Caml-list] Problem using camlp4o on windows.

[Matthieu Wipliez]

>   C:\Documents and Settings\Ed Keith\My Documents\playpen\ocaml>ocaml

>         Objective Caml version 3.11.0
> 
>   # #load "camlp4o.cma";;
>   Characters -1--1:
>     #load "camlp4o.cma";;
> 
>   Error: Reference to undefined global `Dynlink'
>   # exit 0;;
> 
> I have searched the web and I am beginning to suspect that I can not use camlp4 
> on a windows system, is this the case?

I don't think so :-)
Since version 3.11 if you want to use Camlp4 you also need to explicitly load Dynlink, in order to avoid multiple linking problem (or something like that).
This is listed in the Changes:

  Camlp4:
  * programs linked with camlp4lib.cma now also need dynlink.cma.

Using #load "dynlink.cma";; before loading camlp4 will do the trick (I just checked).

Cheers,
Matthieu