On Thu, Apr 23, 2009 at 12:37:14AM -0700, David McClain wrote:

It's been about 5 years since I faced this situation. I'm trying to link 

my program against the Thread module. Things go well until I do the 

ocamlopt compilation, then it aborts the make with the message:

ocamlfind ocamlopt -thread -o sdsp.opt   -package camlp4 -package  

threads -package unix -I ../src -I /usr/local/lib/ocaml/threads  \

-thread -cclib threads.a  nums.cmxa sdsp.cmxa threads/threads.cmxa   \

readline.cmx scmMain.cmx

File "_none_", line 1, characters 0-1:

Error: No implementations provided for the following modules:

         Thread referenced from ../src/sdsp.cmxa(SdlPrims)

make[1]: *** [sdsp.opt] Error 2

make: *** [subdirs] Error 2

The order of the files on the command line matters here.  You need to follow

the order given on the page:

  http://caml.inria.fr/pub/docs/manual-ocaml/manual038.html

(in particular it looks like your sdsp.cmxa needs to come after threads.cmxa).

Does that make it work?

Mark