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Re: [Caml-list] managing ocaml dependencies

From: Nicolas Pouillard
Subject: Re: [Caml-list] managing ocaml dependencies
Date: Thu, 16 Nov 2006 22:43:47 +0100

On 11/16/06, skaller <address@hidden> wrote:
On Thu, 2006-11-16 at 15:20 +0100, Guillaume Rousse wrote:
> I'm trying to use autoconf for ocaml project, and I have troubles with

> They are two different strategies here, either generate them on
> maintainer host and ship them in the distribution, either generate them
> on user's host.

There is no choice: it has to be done by the developer
because sometimes the dependency is semantic, in particular
when order of initialisation matters.

When order of initialization matters, just enforce it.

For example:

(* file 1 *)
let a : int opt = ref None

(* file 2 *)
let _ = a := Some 99

(* file 3 *)

Just add something like:

open File2;; (* because initialization order matters *)

Or if really don't want use open:

module File2 = File2;; (* because initialization order matters *)

Or if really don't want re-export that module (if you don't have a .mli):

let module File2 = File2 in ();; (* because initialization order matters *)

let _ =
  match !a with
  | None -> failwith "WRONG INIT ORDER"
  | Some x -> print_endline (string_of_int x)

You must link in the given order. Ocamldep can tell
2 and 3 depend on 1, but not that 3 depends on 2.

> The second strategy, however, heavily relies on make implementation.
> Whereas GNU make happily generate .depend file on the fly with previous
> snippet, some other implementations don't, such as Digital Unix's one
> (and potentially others).
> Make: Cannot open ../.depend.  Stop.

This is easy to fix: generate a new_makefile and then use
a rule something like:

        cat new_makefile_prefix .depend > new_makefile
        make -f new_makefile

Since this is a rule, the order of evaluation is strict.

Nicolas Pouillard

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