Further investigations ... I'm calling caml_startup which appears to
call this function:

CAMLexport void caml_startup_code(code_t code, asize_t code_size,
                                  char *data, char **argv)
{
  // ...
  sys_init("", argv);
  // ...
}

The first argument to sys_init causes Sys.executable_name to be set to
"", which means that Dynlink.init fails here:

(* Initialize the linker for toplevel use *)

let init_toplevel () =
  (* Read back the known global symbols and the known primitives
     from the executable file *)
  let ic = open_in_bin Sys.executable_name in        <-- failure happens here

This looks like a bug in the case where we need to use Dynlink from a
shared library (.so file).

Note that the code expects to find a bytecode executable, not a native
binary or .so file, but of course I'm trying to run all of this from a
shared library embedded in a C program. There's simply no bytecode
executable around to look at.

What should I do?

Rich.

-- 
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