How to include a local library to an executable with dune ocaml

user_14309364 0
Viewed 338

I have a project structured like this :

root/
|—— dune-project
|—— lib/
|  |—— dune
|  |—— Readertsp.ml
|  |-- ...
|
|—— bin/
|  |—— dune
|  |—— bin.ml

bin.ml :

let city_config = "ch130" in
let path = Readertsp.open_path city_config in ();;

dune:

(executable
 (name MCTS_main)
 (libraries graphics mcts)
)

Readertsp.ml : https://pastebin.com/U0h69uRy

dune :

(library
 (name mcts)
 (modules Readertsp)
 (libraries graphics))

When I try dune build, I get this error :

File "tests/MCTS_main.ml", line 3, characters 0-19:
3 | Readertsp.open_path city_config;;
    ^^^^^^^^^^^^^^^^^^^
Error: Unbound module Readertsp

Do you know how to fix this ?

ocaml-dune ocaml package
2 Answers

Got some hint on the ocaml discord.

My problem was that to access to the open_path function, I had to use

Mcts.Readertsp.Readertsp.open_path

Because if I don't add (wrapped false) to the dune mcts file, it puts all libraries in an only module called Mcts. With a dune file like this :

(library
 (wrapped false)
 (name mcts)
 (modules Readertsp)
 (libraries graphics))

I can call my function like this :

Readertsp.Readertsp.open_path

As highlighted by glennsl in the comment, my last mistake is that I was creating a module inside my Readertsp.ml file, which is already a module itself.

After deleting the module Readertsp = struct in my Readertsp.ml file, I can finally call

Readertsp.open_path
user_143093640

dune will auto-generate a namespace module to prevent collisions between modules with the same name from different libraries. The name of the module will be the library name capitalized. Readertsp should therefore be accessible as Mcts.Readertsp.

Note that you can also override the auto-generated namespace module by providing a similarly named module (Mcts.ml in this case).

user_79435640
Related