I have lot of modules and they are compiled to native code.
So I have .cmx and .o files and want to link them faster.

Is is possible to make linking an associative operation acting on modules?

I would like to do something like the following:
Knowing the correct partial order of modules (that compiler requires) I
can create a tree that preserves that order. Leafs are modules. Other
nodes of the tree correspond to a result of linking all descendant
modules. Modules that are frequently recompiled are placed closer to the
root. This way I expect to execute less linking operations during
development.

Documentation of ld says that files produced with --relocatable can be
used as intermediate partially linked files. Can something like this be
done with object code produced by ocamlopt?
I don't know ocaml-specific details of linking, so maybe I overlook some
obvoius obstacle?

Dawid