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warning: 'int _import_array()' defined but not used
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Neal Becker  
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 More options Mar 6 2012, 8:50 am
From: Neal Becker <ndbeck...@gmail.com>
Date: Tue, 06 Mar 2012 08:50:39 -0500
Local: Tues, Mar 6 2012 8:50 am
Subject: warning: 'int _import_array()' defined but not used
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I tried a simple test:

--
import numpy as np
cimport numpy as np
import cython

@cython.boundscheck(False)
@cython.wraparound(False)
def allequal(np.ndarray[np.float64_t, ndim=1] a):
    cdef:
        np.float64_t a0
        Py_ssize_t i, n=a.size
    a0 = a[0]
    for i in range(n):
        if a[i] != a0:
            return False
    return True
--

On compiling I saw:

/usr/lib64/python2.7/site-packages/numpy/core/include/numpy/__multiarray_ap i.h:
At global scope:
/usr/lib64/python2.7/site-
packages/numpy/core/include/numpy/__multiarray_api.h:1532:1: warning: 'int
_import_array()' defined but not used [-Wunused-function]
/usr/lib64/python2.7/site-packages/numpy/core/include/numpy/__ufunc_api.h:2 26:1:
warning: 'int _import_umath()' defined but not used [-Wunused-function]

Usually, failing to call import_array() is asking for a segfault.  What's going
on here?


 
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Lisandro Dalcin  
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 More options Mar 6 2012, 9:27 am
From: Lisandro Dalcin <dalc...@gmail.com>
Date: Tue, 6 Mar 2012 17:27:17 +0300
Local: Tues, Mar 6 2012 9:27 am
Subject: Re: [cython-users] warning: 'int _import_array()' defined but not used
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On 6 March 2012 16:50, Neal Becker <ndbeck...@gmail.com> wrote:

Cython does not use any single bit of the NumPy C API, so there is no
need to call import_array(). Of course, if your code do use the NumPy
C API, you need to make the call yourself.

Perhaps Cython should special-case numpy.pxd and issue the call to
import_array() in the generated C code?

--
Lisandro Dalcin
---------------
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