cdef extern structs may be c++ classes, can refer to themselves

Cython/Compiler/Nodes.py

@@ -790,6 +790,7 @@ class CStructOrUnionDefNode(StatNode):
                 self.entry.defined_in_pxd = 1
             for attr in self.attributes:
                 attr.analyse_declarations(env, scope)
+            if self.visibility != 'extern':
                 for attr in scope.var_entries:
                     type = attr.type
                     while type.is_array:
@@ -801,7 +802,7 @@ class CStructOrUnionDefNode(StatNode):
                             type = type.base_type
                         if type == self.entry.type:
                             need_typedef_indirection = True
-        if need_typedef_indirection and self.visibility != 'extern':
+            if need_typedef_indirection:
                 # C can't handle typedef structs that refer to themselves. 
                 struct_entry = self.entry
                 cname = env.new_const_cname()