clang-cl support
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- Dominant language
- TypeScript
- Stars
- 228
- Forks
- 48
- Avg merge
- 15m
- Merged PRs (30d)
- 10
Description
Add clang-cl as a compiler option on Windows. clang-cl is a drop-in replacement for cl.exe that uses LLVM/Clang with an MSVC-compatible interface, and is pre-installed on GitHub-hosted runners as part of the Visual Studio LLVM toolset (VC.Llvm.Clang).
Unlike MSVC which is cleanly handled by opam through the msvs-detect → conf-msvc64 → ocaml-env-msvc64 chain, there is currently no opam-level mechanism for clang-cl. Setting CC=clang-cl globally in setup-ocaml would affect all package builds, not just the OCaml compiler itself.
This is blocked on upstream opam support — a system-clang-cl package or an option package that scopes CC=clang-cl to the opam build environment would be the proper approach. See discussion in #950 (https://github.com/ocaml/setup-ocaml/issues/950#issuecomment-4103754883).
Related: #950
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the discussion in #950, especially the linked comment, and review how setup-ocaml currently handles the msvs-detect, conf-msvc64, and ocaml-env-msvc64 chain. Confirm the upstream opam support needed for clang-cl and define completion as a compiler-only clang-cl option that does not change CC for other package builds.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- github-actions, ocaml
- Domain
- build-system, ci-cd, compilers
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 25/100