Error while trying to compile Cython output with GCC

Question

I'm trying to compile a Cython3 file into an executable using GCC. For the moment I'm still stuck with a simple "hello world" :

# -*- coding: utf-8 -*-
if __name__ == "__main__":
    print("Hello World !")

Here is the command I've tried to execute in order to compile this simple program :

cython3 test.pyx
gcc -I/usr/include/python3.4 test.c

The first command run correctly, but here is what I get when I type the second one :

cython.c:422:14: error: conflicting types for ‘PyTypeObject’
 typedef void PyTypeObject;
              ^
In file included from /usr/include/python3.4/pytime.h:6:0,
                 from /usr/include/python3.4/Python.h:65,
                 from cython.c:16:
/usr/include/python3.4/object.h:422:3: note: previous declaration of ‘PyTypeObject’ was here
 } PyTypeObject;
   ^
cython.c: In function ‘__Pyx_PyObject_GetAttrStr’:
cython.c:488:18: warning: dereferencing ‘void *’ pointer
     if (likely(tp->tp_getattro))
                  ^
cython.c:399:43: note: in definition of macro ‘likely’
   #define likely(x)   __builtin_expect(!!(x), 1)
                                           ^
cython.c:488:18: error: request for member ‘tp_getattro’ in something not a structure or union
     if (likely(tp->tp_getattro))
                  ^
cython.c:399:43: note: in definition of macro ‘likely’
   #define likely(x)   __builtin_expect(!!(x), 1)
                                           ^
cython.c:489:18: warning: dereferencing ‘void *’ pointer
         return tp->tp_getattro(obj, attr_name);
                  ^
cython.c:489:18: error: request for member ‘tp_getattro’ in something not a structure or union

I'm currently running on Debian testing, and therefore I have the following versions of Python and Cython :

Python: 3.4.2-2
Cython: 0.21.1-1

Answer 1

Problem solved using the following commands :

cython3 test.pyx
gcc -I/usr/include/python3.4m test.c -lpython3.4m

Answer 2

I doubt your answer solves the problem.

Your original problem was, that the extension was called cython.pyx (taking into account this post ).

However, it is not allowed to name your cython-module "cython" because it is a special name for Cython and leads to a generated c-file which cannot be compiled (for whatever reason spurious typedef void PyTypeObject; is inserted). Unluckily cython doesn't report an error for this case.

Renaming the pyx-file/extension from cython.pyx to test.pyx solved the issue.