> I have a c++-library compiled with the icc-compiler, a c-interface to this 
> library (cinterface.h and cinterface.cpp) and stubs files generated using 
> camlidl (ocaml_opt.idl, ocaml_opt_stubs.cpp, ocaml_opt.ml, ocaml_opt.mli). 
> I try to build a custom toplevel with:
> [...]
> but get an almost endless list of undefined references (almost 6000 lines of 
> output). Here some examples:

I avoid C++ as much as I can, so this is just a wild guess.  Could it
be that you're calling the wrong linker?  ocamlmltop -custom performs
its linking stage by calling the C compiler that was used to build
OCaml, usually cc or gcc.  (You can see exactly how the linker is
called by adding the flag -verbose.)  Maybe you need to use icc as the
linker, or pass some magic flag to it telling that you're using C++
libraries.  You can do that with the -cc flag, e.g.

        ocamlmktop -cc "icc <whatever options>" -custom ...

Good luck,

- Xavier Leroy
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