ocaml debugger can't find core when run from emacs

Question

I'm trying to use the ocaml debugger to display variables at runtime from emacs. When I use the middle mouse button, as suggested by this guide my system just pastes from the clipboard. When I try to explicitly use the display command on a variable, I get

Cannot find module Core.Std

I have no problems with this when I compile using corebuild, so I know I have Core installed. Also, when I explicitly use the directory command to add the libraries for core and core_extended, it properly displays the variable. Is there some better way to make this work?

Answer 1

To print values ocamldebug needs to have the .cmi file containing the value's type in its search path. You can add directories to the search path using -I command-line arguments or the directory command.

Whilst ocamlfind doesn't seem to support ocamldebug directly, you can still use it to pass the correct -I arguments using the following command-line:

ocamldebug `ocamlfind query -recursive -i-format core` foo

where foo is the program being debugged.