I’m confused about what’s happening and how to fix it. I’m on macOS and the Unix module works in utop but fails in dune build, dune exec, and possibly other commands. It is ocaml-platform extension in vscode sees the module (shows the signature when I hover the symbol, and allows to jump to the unix.mli file whose path is in my one and only switch).
I have reproduced the problem in a simple app named hellocaml with the following main.ml:
let () =
Printf.printf "Hello, %s" (Unix.getenv "HOME");
When I run dune exec hellocaml I get the following error
File "_none_", line 1:
Error: No implementations provided for the following modules:
Unix referenced from bin/.main.eobjs/native/dune__exe__Main.cmx
But if I launch dune utop the same code works.
Using other standard libraries, such as Sys.getenv, shows no issues.
The project was created with dune init project hellocaml. The dune-project is
(lang dune 3.2)
(name hellocaml)
(generate_opam_files true)
(package
(name hellocaml)
(synopsis "A short synopsis")
(description "A longer description")
(depends ocaml dune))
The dune files have not been touched.
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