PYTHON setup.py build_ext --inplace

######## setup.py ########

from Cython.Build import cythonize
from distutils.core import setup

setup(
    ext_modules = cythonize("*.pyx"),
)

######## test.pyx ########

from moda cimport DEFINE_A
from modb cimport DEFINE_B

######## moda.pxd ########

from verbatim cimport DEFINE_ONCE as DEFINE_A

######## modb.pxd ########

from verbatim cimport DEFINE_ONCE as DEFINE_B

######## verbatim.pxd ########

# Check that we include this only once
cdef extern from *:
    """
    #ifdef DEFINE_ONCE
    #error "DEFINE_ONCE already defined"
    #endif

    #define DEFINE_ONCE 1
    """
    int DEFINE_ONCE