Re: [Caml-list] ocamlbuild .inferred.mli problem

["Hezekiah M. Carty" <hcarty@atmos.umd.edu>]

On Mon, 17 Sep 2007, Nicolas Pouillard wrote:

> > I have also tried creating a myocamlbuild.ml to get around this, but
> > using something like this in myocamlbuild.ml:
> > 
> > flag ["use_openin"]
> >   (S [A "-I"; A "+camlp4"; A "-pp"; A "camlp4o pa_openin.cmo"]);;
> 
> You  certainly don't want to add these flags to any commands that treat a file
> that  is  tagged  use_openin.  You  certainly  want to add them only for ocaml
> preprocessing.
> 
> flag ["ocaml"; "pp"; "use_openin"]
>      (A"pa_openin.cmo");;
> 

This gets me a little bit closer I think, but I'm still not able to
make ocamlbuild do what I want.

Here's the current code -
test.ml:
let sum l = open List in fold_left (+) 0 l

_tags:
"test.ml": use_openin

myocamlbuild.ml:
open Ocamlbuild_plugin;;
open Command;;
flag ["ocaml"; "pp"; "use_openin"] (A "pa_openin.cmo");;

Using the above "flag ..." line adds "-pp pa_openin.cmo" to the
compilation command line using the following line in _tags:
"test.ml": use_openin

If I change the _tags line to:
"test.ml": camlp4o, use_openin

the output from ocamlbuild test.cma is:
+ /home/hcarty/Applications/godi/bin/ocamldep.opt -pp 'pa_openin.cmo
camlp4o' -modules test.ml > test.ml.depends
sh: pa_openin.cmo: command not found
Preprocessing error on file test.ml

How do I fix this to properly use a syntax extension such as
pa_openin.cmo and be able to specify the location of the .cmo, but
only for the files which need that specific extension?  ie. add "-I
+camlp4" to the ocaml* command line, and have the -pp value in the
correct order.

I apologize for asking such a basic question, but I haven't been
able to figure out the answer from the user's guide or other
examples I've found.  Once this is all worked out I would be happy
to add this to a wiki somewhere.

Thanks,
Hez