Backtraces in modules?

[Han-Wen Nienhuys]

Hi there,

 I have trouble getting backtraces in code evalled within loaded 
modules. I do

  String mod_nm = "scm framework-" + output_backend_global;
  SCM mod = scm_c_resolve_module (mod_nm.to_str0 ());
  if (make_print)
    {
      SCM func = scm_c_module_lookup (mod, "output-framework");

      func = scm_variable_ref (func);
      scm_apply_0 (func, .. )

iow. I load the scm/framework-foo.scm module, which contains

 (define-public (output-framework basename book scopes fields)
  (debug-enable 'backtrace)
  (foobar)


then I get

  Calculating line breaks... [2]ERROR: Unbound variable: foobar
  muurbloem:~/src/lilypond$

how do I get a stack trace? I've traced the problem to scm_make_stack(), 
which cannot construct a frame, since scm_i_last_debug_frame() returns 0x0.

any pointers?

--
 Han-Wen Nienhuys - address@hidden - http://www.xs4all.nl/~hanwen