ocaml / ocaml/dune

Dependency analysis: Unnecessary/undesired compilation unit included in executable

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help wanted wontfix
Dominant language
OCaml
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Description

There seems to be the following problem:

open Hellolib;;
Hello.hello ()  (* = Hellolib.Hello.hello () *)

results in any local hello.ml to be compiled and linked against our executable, even though we don't use this Hello in this particular program.

Suggested workaround: Rename the local hello.ml, e.g. hello_main.ml.

See https://github.com/mjambon/dune-dependencies for exact reproduction details.

Contributor guide

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with the exact reproduction linked at https://github.com/mjambon/dune-dependencies and the local hello.ml example described in the issue. Trace why opening Hellolib causes the unused compilation unit to be included, then verify that an executable no longer compiles or links the local hello.ml when it does not use it.

Written by the indexing model from the issue text.

Assessment

Tech stack
ocaml
Domain
build-system
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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