OCaml rules for Bazel

Rules

• ocaml_native_binary
• ocaml_bytecode_binary
• ocaml_interface

Overview

Build OCaml with Bazel. Very experimental.

Setup

Add the following to your WORKSPACE file.

git_repository(
    name = "io_bazel_rules_ocaml",
    remote = "https://github.com/jin/rules_ocaml.git",
    commit = "7a0a6e5226af5f09eb6e3379b901d8f2ffdb8bbf",
)

load("@io_bazel_rules_ocaml//ocaml:repo.bzl", "ocaml_repositories")
ocaml_repositories(
    opam_packages = {
        # Put your OPAM dependencies here
        "lwt": "3.1.0",
        "yojson": "1.4.0",
    },
)

and this to your BUILD files.

load("@io_bazel_rules_ocaml//ocaml:ocaml.bzl", "ocaml_native_binary", "ocaml_bytecode_binary", "ocaml_interface")

ocaml_repositories() will download and compile the OCaml toolchain, including ocamlbuild, ocamlfind and OPAM itself, as the official source doesn't release binaries directly and requires the use of OPAM for installations.

The initial load time of toolchain compilation will take a few minutes and will not happen again for the same project.

Rules

ocaml_native_binary/ocaml_bytecode_binary

Generates a native binary using ocamlopt or bytecode binary using ocamlc.

ocaml_native_library(name, srcs, src_root, opam_packages)
ocaml_bytecode_library(name, srcs, src_root, opam_packages)

Example

ocaml_native_binary(
    name = "hello_world",
    srcs = glob(["examples/*.ml"]),
    src_root = "examples/hello_world.ml",
    opam_packages = ["yojson", "lwt"],
)

ocaml_bytecode_binary(
    name = "other_binary",
    srcs = [
      "examples/foo.ml",
      "examples/bar.ml",
      "examples/entry.ml",
    ],
    src_root = "examples/entry.ml",
    opam_packages = ["pkg_foo", "pkg_bar"],
)

ocaml_interface

Generates a .mli file of the source file.

ocaml_interface(name, src)

Example

ocaml_interface(
    name = "hello_world_interface",
    src = "examples/hello_world.ml",
)

Projects using rules_ocaml

• https://github.com/jin/scheme.ml