[Caml-list] Custom toplevel and ocamlbuild

["Armaël Guéneau" <armael.gueneau@ens-lyon.fr>]

Hi list,

I was trying to build a custom toplevel, bundled with my custom
modules, and encountered a few issues.

Following the last advice given by gasche on this reddit post
https://www.reddit.com/r/ocaml/comments/3qjs1q/utop_is_a_much_better_toplevel_than_ocaml_if_you/cwisrrj
I copy-pasted the files from examples/custom-utop, added a foo.ml file
containing "let x = 3", and added "Foo" at the end of myutop.mltop.

Then, if I compile the custom toplevel using the provided Makefile
(which simply uses ocamlbuild and the builtin rule for .mltop files, I
guess), the toplevel produced does not have access to the Foo module.

However, if I manually build using ocamlfind ocamlmktop:

   ocamlfind ocamlmktop -o myutop -thread -linkpkg -package utop foo.cmo 
myutop_main.cmo

this time, it works, and `myutop` has access to Foo.

Is the default ocamlbuild rule for building .mltop files missing some
option?  Am I doing something wrong?

— Armaël