[Caml-list] Obtaining module dependencies from within OCamlbuild plugin

[Dario Teixeira <dario.teixeira@nleyten.com>]

Hi,

I'm trying to manipulate a project's dependencies from within an 
OCamlbuild
plugin, and one prerequisite is obtaining the current set of 
dependencies
for a given module.  For instance, to obtain the set of dependencies for
module "src/foo_c.ml", one could expect to invoke the following from 
within
the After_rules hook of myocamlbuild.ml:

   Command.deps_of_tags (tags_of_pathname "src/foo_c.ml")

This always returns an empty list, however.  The same holds if one tries
to narrow the list of tags to just the filename:

   Command.deps_of_tags (Tags.of_list ["file:src/foo_c.ml"])

One possible explanation for this behaviour is that the set of 
dependencies
has not been computed yet when the After_rules hook is invoked.  Is that 
the
case, or am I missing something altogether different?  Either way, how 
do I
obtain the set of dependencies?

Thanks in advance for your attention!
Kind regards,
Dario Teixeira