error building native code with ocamlbuild

error building native code with ocamlbuild

[Ashish Agarwal]

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Using ocamlbuild on the following example to build native code includes a
library twice, causing an error, but byte-code works fine. Am I doing
something wrong or is it a bug? Thanks for any help.

~/tmp$ cat myocamlbuild.ml
open Ocamlbuild_plugin;;
open Command;;

dispatch begin function
  | After_rules ->
      ocaml_lib ~extern:true "unix";
  | _ -> ()
end;;

~/tmp$ cat _tags
<pwd.{native,byte}>: use_unix

~/tmp$ cat pwd.ml
let _ = print_endline (Unix.getcwd())

~/tmp$ ocamlbuild pwd.byte
Finished, 3 targets (3 cached) in 00:00:00.

~/tmp$ ocamlbuild pwd.native
+ /usr/local/bin/ocamlopt.opt unix.cmxa unix.cmxa pwd.cmx -o pwd.native
Files /usr/local/lib/ocaml/unix.cmxa and /usr/local/lib/ocaml/unix.cmxa
both define a module named Unix
Command exited with code 2.
Compilation unsuccessful after building 4 targets (2 cached) in 00:00:00.

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Re: [Caml-list] error building native code with ocamlbuild

[Erick Tryzelaar]

Ashish Agarwal wrote:
> Using ocamlbuild on the following example to build native code 
> includes a library twice, causing an error, but byte-code works fine. 
> Am I doing something wrong or is it a bug? Thanks for any help.

It looks like you're getting the unix library added twice, which 
ocamlopt doesn't like. In your case, I don't think you even need the 
myocamlbuild.ml file. ocamlbuild already has the unix library set up for 
it, so the _tags file should be enough for you.

Re: [Caml-list] error building native code with ocamlbuild

[Ashish Agarwal]

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Thanks. Is there a list of tags somewhere? I cannot find them in the user
guide or wiki.

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Re: [Caml-list] error building native code with ocamlbuild

[Erick Tryzelaar]

Ashish Agarwal wrote:
> Thanks. Is there a list of tags somewhere? I cannot find them in the 
> user guide or wiki.
>
I don't believe so, but that'd be nice. From what I understand, you can 
just do "use_foo" with all of the built in ocaml libraries, like str, 
nums, and etc.

Re: [Caml-list] error building native code with ocamlbuild

[Nicolas Pouillard]

Excerpts from Ashish Agarwal's message of Tue Dec 04 16:31:58 +0100 2007:
> Thanks. Is there a list of tags somewhere? I cannot find them in the user
> guide or wiki.

You  can  get  dynamic  list  of  flags  (referring  to  tags) and rules using
ocamlbuild -documentation.

Regards,
-- 
Nicolas Pouillard aka Ertai