[Cython] 0.9.8.1.1 and .pxd files

[Jason Evans]

Lisandro Dalcin wrote:
> Sorry, forgot to attach...
> 
> On Thu, Oct 30, 2008 at 11:28 PM, Lisandro Dalcin <dalcinl at gmail.com> wrote:
>> If all you can accept some vile hackery, see the attached tarball ;-) .
>>
>> Python recognizes a PKGNAME directory as a pakage if '__init__.py' is
>> there, if not, no way. BUT  if '__init__.so' is also there, it loads
>> '__init__.so' !!! But then the exported module init function in the
>> dynlib needs to be named initPKGNAME, and "PKGNAME" needs to be passed
>> to Py_InitModule()
>>
>> So, Greg, here you have the rules if you want to implement it ;-).
>>
>> PS: tried only in Py 2.5, this is surely undocumented, and probably it
>> is in fact some bugy code in CPython's  'import.c' .

I finally got around to playing with your example, and after working 
past a couple of issues, I got it to work for my software.  For the 
record, I had to use the following __init__.h file:

---------------------------------------------------------------------
#if SIZEOF_SIZE_T != SIZEOF_INT
#  define Py_InitModule4_64(name,a,b,c,d) Py_InitModule4_64("Crux",a,b,c,d)
#else
#  define Py_InitModule4(name,a,b,c,d) Py_InitModule4("Crux",a,b,c,d)
#endif

#define init__init__(a) initCrux(a)
---------------------------------------------------------------------

After I got this working, I took a look at the generated __init__.c, and 
realized that there is no simple way to extend the approach to Python 3, 
since "__init__" is directly embedded in a data structure used for 
module initialization.  The attached patch modifies Cython to handle the 
__init__ module name specially.  This works correctly for my software. 
Does it look like a general solution?

Thanks,
Jason
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