[Swig-devel] cast handling in SWIG_InitializeModule

[Stefan Z. <ste...@am...>]

(Re-posting this after subscribing to the list).

I'm having some trouble getting the casting information correct for a set of
related modules, and it looks to me like something's wrong in
SWIG_InitializeModule.  Here's the scenario that's failing for me:

- Module Foo is loaded first.
- Foo knows about types Parent and Child, but it doesn't know that a Child can
be cast to Parent.
- Module Bar is loaded second.
- Module Bar knows about Parent and Child, and it DOES know that Child can be
cast to Parent.

In this case, when module Bar is being loaded, the swig_type_info for Child is
correctly imported from Foo into Bar.  However, the swig_cast_info for casting
Child to Parent still points to Child's swig_type_info from
swig_module.type_initial in Bar, rather than the swig_type_info imported from
Foo.

The following patch works for me; am I missing anything?

Thanks,

Stefan Zager

===================================================================
--- swiginit.swg        (revision 11216)
+++ swiginit.swg        (working copy)
@@ -150,11 +150,11 @@
 #endif
       }
       if (ret) {
+       cast->type = ret;
        if (type == swig_module.type_initial[i]) {
 #ifdef SWIGRUNTIME_DEBUG
          printf("SWIG_InitializeModule: skip old type %s\n", ret->name);
 #endif
-         cast->type = ret;
          ret = 0;
        } else {
          /* Check for casting already in the list */