Re: [Caml-list] ocamlbuild and pack

["Nicolas Pouillard" <nicolas.pouillard@gmail.com>]

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Excerpts from johannes.kanig's message of Tue Sep 09 15:38:04 +0200 2008:
> Hi List,
> 
> I have the following problem. I have three files, each consisting of one
> line:
> 
> a.ml: type t = float
> b.ml: type t = A.t
> c.ml: include B
> 
> Now I want to put these modules into a pack, but I only want to export A and
> C, so I write a file project.mli:
> module A : sig type t end
> module C : sig type t = A.t end
> 
> As I want to use ocamlbuild, I also create a file project.mlpack:
> A
> C

B should be in the pack even if you want to hide it.

> Now, the command "ocamlbuild project.cmo" works fine, but I can't build a
> library from that:
> ocamlbuild  project.cma
> Circular dependencies: "project.cmo" already seen in
>   [ "b.cmo"; "project.cmo" ]
> 
> There clearly aren't any circular dependencies, are there? Am I missing
> something?

B depends on A, but A is in the pack Project. {B|->Project}
Project includes C, that depends on B. {Project->B}

> The problem goes away if I export B instead of C. So the troublemaker seems
> to be the include directive.

In that case:

* A is in Project {}
* B depends on A that is in Project, but B is also in Project {}
* C depends on B that is in Project {C->Project}

No cycle in this one

-- 
Nicolas Pouillard aka Ertai

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