Thanks, I didn't realise that. Replacing Puz_plugin.read with Puz.read
compiled, but didn't link:

+ ocamlfind ocamlopt -linkpkg -g -thread -package core_kernel
plugins/puz/puz_types.cmx plugins/puz/puz_utils.cmx plugins/puz/puz_bin.cmx
plugins/puz/puz_match.cmx types.cmx xword.cmx plugins/puz/puz.cmx file.cmx
-o file.native
File "_none_", line 1:
Error: No implementations provided for the following modules:
         Bitstring referenced from plugins/puz/puz_bin.cmx
         Run_mikmatch_pcre referenced from plugins/puz/puz_match.cmx
         Str referenced from plugins/puz/puz.cmx
         Pcre referenced from plugins/puz/puz_match.cmx
Command exited with code 2.

I don't (yet) need dynamic linking; my current main aim with the .mllib
setup is to specify the package dependencies for each plugin in its own
section of the _tags file, and not have a long list of every plugin's
dependencies in the main module.

martin

On Mon, Sep 21, 2015 at 11:45 PM, Gabriel Scherer <gabriel.scherer@gmail.com
> wrote:

> A .cma or .cmxa archive does not pack its sub-modules under a common
> module name: the module name Puz_plugin that you use does not refer to
> anything. Accessing any of the constituent modules directly (eg.
> Puz_match.foo) should work -- although it may not go through the .cmxa
> but directly refer to the compilation unit.
>
> Note that if "_plugin" is intended to refer to dynamic linking, you
> may want to use a .mldylib file instead of .mllib, to be used to
> generate a .cmxs file: .cmxa is not suitable for dynamic linking
> (while, at the bytecode level, .cma work for both static and dynamic
> linking).
>
> On Tue, Sep 22, 2015 at 8:23 AM, Martin DeMello <martindemello@gmail.com>
> wrote:
> > If I have my project set up like this:
> >
> > .
> > ├── file.ml
> > ├── plugins
> > │   └── puz
> > │       ├── puz_bin.ml
> > │       ├── puz_match.ml
> > │       ├── puz.ml
> > │       ├── puz_plugin.mllib
> > │       ├── puz_types.ml
> > │       └── puz_utils.ml
> > └── _tags
> >
> > $ cat plugins/puz/puz_plugin.mllib
> > Puz Puz_bin Puz_match
> >
> > This works:
> >
> > $ ocamlbuild -use-ocamlfind plugins/puz/puz_plugin.cmxa
> > Finished, 22 targets (3 cached) in 00:00:03.
> >
> > My _tags file:
> > ------------------------------------------------
> > $ cat _tags
> > true: thread,debug
> > true: package(core_kernel)
> >
> > "plugins/puz": include
> >
> > <gui.*>: package(labltk)
> > <**/puz.*>: package(unix), package(str), package(core_kernel),
> > package(bitstring), package(mikmatch_pcre)
> > <**/*_bin.*>: package(bitstring.syntax), syntax(bitstring)
> > <**/*_match.*>: package(mikmatch_pcre), syntax(camlp4o)
> > ------------------------------------------------
> >
> > But I can't figure out how to use this library in my main program. This
> is a
> > minimal example of what I'm trying to do, not working of course:
> >
> > $ cat file.ml
> > open Core_kernel.Std
> >
> > let read fname =
> >   let data = In_channel.read_all fname in
> >   Puz_plugin.read data
> >
> > $ ocamlbuild -use-ocamlfind file.native
> > + ocamlfind ocamlc -c -g -thread -package core_kernel -I plugins/puz -o
> > file.cmo file.ml
> > File "file.ml", line 5, characters 2-17:
> > Error: Unbound module Puz_plugin
> >
> > martin
>