.

bigfile/_file_zodb.pyx

@@ -50,23 +50,20 @@ cdef extern from *:
     ctypedef extern class wendelin.bigfile._bigfile.BigFile[object CXXPyBigFile]:
         pass
 
-
 # helper for ZBigFile - just redirect loadblk/storeblk back
 # (because it is not possible to inherit from both Persistent and BigFile at
 #  the same time - see below)
 cdef class _ZBigFile(BigFile):
-    # .zself    - reference to ZBigFile
+#cdef class _ZBigFile:
+    cdef object zself   # reference to ZBigFile
 
-    """
-    def __new__(cls, zself, blksize):
-        obj = BigFile.__new__(cls, blksize)
+    # XXX Cython does not allow __new__ nor to change arguments passed to __cinit__ / __init__
+    @staticmethod
+    def _new(zself, blksize):
+        cdef _ZBigFile obj = _ZBigFile.__new__(_ZBigFile, blksize)
         obj.zself = zself
         return obj
-    """
 
-    def __cinit__(self, zself, blksize):
-        BigFile.__cinit__(self, blksize)
-        self.zself = zself
 
     # redirect load/store/mapper to main class
     def loadblk(self, blk, buf):    return self.zself.loadblk(blk, buf)

bigfile/file_zodb.py

@@ -546,7 +546,7 @@ class ZBigFile(LivePersistent):
 
     def __setstate__(self, state):
         self.blksize, self.blktab = state
-        self._v_file = _ZBigFile(self, self.blksize)
+        self._v_file = _ZBigFile._new(self, self.blksize)
         self._v_filehset = WeakSet()
 
 

setup.py

@@ -268,7 +268,6 @@ setup(
                     PyGoExt('wendelin.bigfile._file_zodb',
                         ['bigfile/_file_zodb.pyx'],
                         extra_compile_args = [
-                            '-fplan9-extensions',   # anonymous-structs + simple inheritance
                             '-std=gnu++11', # not c++11 since we use typeof
                         ]),