[Caml-list] output-obj rule in ocamlbuild

[Caml-list] output-obj rule in ocamlbuild

[Anil Madhavapeddy]

Is there a built-in rule in ocamlbuild to generate the -output-obj output instead of a direct link?

I note there are these built-in tags in the ocamlbuild source:

ocaml_specific.ml:flag ["ocaml"; "link"; "native"; "output_obj"] (A"-output-obj");;
ocaml_specific.ml:flag ["ocaml"; "link"; "byte"; "output_obj"] (A"-output-obj");;

...but I can't find a built-in target that uses these tags. Is a custom rule in myocamlbuild.ml needed here, or should I do something in my _tags file?

cheers,
Anil

Re: [Caml-list] output-obj rule in ocamlbuild

[Anil Madhavapeddy]

I ended up copying some of the rules out of ocamlbuild/ocaml_specific.ml and replicating it in myocamlbuild.ml.  For the archives, a rule "%.m.o" looks like:

(* Copied from ocaml/ocamlbuild/ocaml_specific.ml and modified to add
   the output_obj tag *)
let native_output_obj x =
  link_gen "cmx" "cmxa" !Options.ext_lib [!Options.ext_obj; "cmi"]
     ocamlopt_link_prog 
    (fun tags -> tags++"ocaml"++"link"++"native"++"output_obj") x

let () =
  (* Copied from ocaml/ocamlbuild/ocaml_specific.ml *)
  let ext_obj = !Options.ext_obj in
  let x_o = "%"-.-ext_obj in

  (* Rule to link a module and output a standalone object file *)
  rule "ocaml: cmx* & o* -> .m.o"
    ~tags:["ocaml"; "native"; "output_obj"]
    ~prod:"%.m.o"
    ~deps:["%.cmx"; x_o]
    (native_output_obj "%.cmx" "%.m.o");

-Anil

On 25 Aug 2011, at 15:09, Anil Madhavapeddy wrote:

> Is there a built-in rule in ocamlbuild to generate the -output-obj output instead of a direct link?
> 
> I note there are these built-in tags in the ocamlbuild source:
> 
> ocaml_specific.ml:flag ["ocaml"; "link"; "native"; "output_obj"] (A"-output-obj");;
> ocaml_specific.ml:flag ["ocaml"; "link"; "byte"; "output_obj"] (A"-output-obj");;
> 
> ...but I can't find a built-in target that uses these tags. Is a custom rule in myocamlbuild.ml needed here, or should I do something in my _tags file?
> 
> cheers,
> Anil
> 
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