myocamlbuild.ml.in

let cxx_rule () =
  let deps = ["%.hpp"; "%.cpp"; "%.h"] and prod = "%.o" in
  let action env _ =
    let src = env "%.cpp" and obj = env "%.o" in
    let cxx = expand "${cxx} ${cc_optimization} ${cxxflags}" in
    let tags = tags_of_pathname src ++ "c++" ++ "compile" in
    Cmd (S [Sh cxx; T tags; A "-c"; P src; A "-o"; Px obj]) in
  rule "cxx: hpp & cpp & h -> o" ~deps ~prod action

let () = Rules.add cxx_rule


let mark_tags () =
  let module Ocamlbuild_compat = struct
    let mark_tag_used = ignore
    include Ocamlbuild_plugin
  end in
  let open Ocamlbuild_compat in
  List.iter mark_tag_used [
    "pkg_core_bench";
    "tests";
    "pkg_piqirun";
    "pkg_core";
  ]

(* we will pass this manually, util it is fixed *)
let pr_6184_hack = function
  | After_rules ->
    (* Pass -predicates to ocamldep *)
    pflag ["ocaml"; "ocamldep"] "predicate" (fun s -> S [A "-predicates"; A s]);
  | _ -> ()


let pass_pp_to_link = function
  | After_rules ->
    let set acts = pflag acts "pp" (fun s -> S [A "-pp"; A s]) in
    set ["link"];
    set ["c"; "compile"];
  | _ -> ()

let chop_extension file =
  try Filename.chop_extension file
  with exn -> invalid_arg ("Failed to chop extension from '" ^ file ^ "'")

let unit_of_package pkg =
  let open MyOCamlbuildFindlib in
  let ocamlfind s =
    run_and_read (exec_from_conf "ocamlfind" ^ " " ^ s) in
  let archive = ocamlfind ("query -format %a -predicates byte " ^ pkg) in
  if String.length archive > 3
  then Some (chop_extension archive)
  else None

let predicate_used_packages = function
  | After_rules ->
    MyOCamlbuildFindlib.find_packages () |>
    List.iter (fun pkg -> match unit_of_package pkg with
        | None -> ()
        | Some lib ->
          flag ["ocaml"; "link"; "pkg_"^pkg]
            (S [A "-predicates"; A ("used_"^lib)]))
  | _ -> ()



let predicate_used_libs = function
  | After_rules ->
    package_default.MyOCamlbuildBase.lib_ocaml |>
    List.iter (fun (lib,_,_) ->
        flag ["ocaml"; "link"; "use_"^lib]
          (S [A "-predicates"; A ("used_"^lib)]))
  | _ -> ()



let () =
  mark_tags ();
  Ocamlbuild_plugin.dispatch (fun stage ->
      Rules.dispatch stage;
      dispatch_default stage;
      pr_6184_hack stage;
      pass_pp_to_link stage;
      predicate_used_libs stage;
      predicate_used_packages stage;
      Ppx_driver_ocamlbuild.dispatch stage)