Compiler crash in C++ declarations

[robertwb]

 http://groups.google.com/group/cython-users/browse_thread/thread/34dd7cecbffcfd44

...
 File "/home/matt/Downloads/cython-devel-d9a3831ec027/cython-devel-
d9a3831ec027/Cython/Compiler/Nodes.py", line 1050, in
analyse_declarations
   attr.analyse_declarations(scope)
 File "/home/matt/Downloads/cython-devel-d9a3831ec027/cython-devel-
d9a3831ec027/Cython/Compiler/Nodes.py", line 939, in
analyse_declarations
   api = self.api)
 File "/home/matt/Downloads/cython-devel-d9a3831ec027/cython-devel-
d9a3831ec027/Cython/Compiler/Symtab.py", line 1564, in
declare_cfunction
   self.check_base_default_constructor(pos)
 File "/home/matt/Downloads/cython-devel-d9a3831ec027/cython-devel-
d9a3831ec027/Cython/Compiler/Symtab.py", line 1537, in
check_base_default_constructor
   if len(entry.type.base_classes) == 0:
AttributeError: 'CStructOrUnionType' object has no attribute
'base_classes'

[MattBro]

simple .pyx and .h files to replicate bug

[MattBro]

So the issue appears to be that my attempt to forward declare gpumat (ahh that should have been replaced with badmat in my example), results in an error when declaring the gpumat constructor. Thus currently forward declarations are precluded.

However this will create problems for sufficiently complex C++ code. In my case I have a subclass of gpumat (cupper) that I need to forward declare in my C++ code. That's because a method in the gpumat class (qr() ) returns a cupper. How can this be done in the current C++ wrapper code?