Pyrex: Incomplete C types

[Edward C. Jones]

I have some questions about wrapping incomplete C types in Pyrex.

Where in a C compiler are incomplete types processed? The grammars I am
using don't seem to deal with it (I hope I am wrong here).

Is the file "IncTypes_wrapped.pyx" below correct?

Is there any way to wrap "BBB" without knowing about "CCC" or "DDD"?

Two questions are asked in the code below.

Is there a better way to write the "cdef extern"s? What does Pyrex know
about incomplete types?

Suppose I have a declaration in a C header file. Can I always wrap it in
Pyrex using only information in the declaration itself?

Thanks,
Ed Jones

----------------------
IncTypes.h:

typedef struct {
     int jjj;
} AAA;

typedef struct {
     int jjj2;
} AAA2;

typedef struct _BBB {
     AAA* aaa;
     struct AAA2* aaa2; /* Is this correct C? */
     struct _BBB *bbb;
     struct _CCC *ccc;
     struct _DDD *ddd;
} BBB;

typedef struct _CCC {
     int iii;
} CCC;

typedef struct _DDD DDD;

----------------------
IncTypes.c:

#include "IncTypes.h"

----------------------
IncTypes_wrapped.pyx:

cdef extern from "IncTypes.h":
     ctypedef struct AAA:
         int jjj

cdef extern from "IncTypes.h":
     ctypedef struct AAA2:
         int jjj2

cdef extern from "IncTypes.h":
     cdef struct AAA2  # Is this line harmless? If it is, I might be able to
                       # wrap "BBB" locally, using only the definition 
of "BBB"
                       # in the header file.
     cdef struct _BBB
     cdef struct _CCC
     cdef struct _DDD
     ctypedef struct BBB:
         AAA * aaa
         AAA * aaa2
         _BBB * bbb
         _CCC * ccc
         _DDD * ddd

cdef extern from "IncTypes.h":
     ctypedef struct CCC:
         int iii

cdef extern from "IncTypes.h":
     ctypedef _DDD DDD

----------------------
compileit:

pyrexc IncTypes_wrapped.pyx
gcc -c -fPIC -I/usr/include/python2.2/ IncTypes_wrapped.c