Getting RDoc to work on C/C++ files.

using_rdoc.c

/*
 * This comment WON'T be processed.
 */
static VALUE undocumented_method(VALUE self) {
  return Qnil;
}

/*
 * This comment WILL be processed.
 */
static VALUE documented_method(VALUE self) {

}

void Init_klass() {
  cKlass = rb_define_class("Klass", rb_cObject);

  rb_define_method(cKlass, "undocumented_method", (METHOD)undocumented_method, 0);
  rb_define_method(cKlass, "documented_method", documented_method, 0);
}