Neal Norwitz wrote:
>  On 1/10/06, M.-A. Lemburg <mal@[...].com> wrote:
> > We'd also have to make sure that old extensions don't
> > just import with a warning, since the change will introduce
> > buffer overflows and seg faults in extensions that are not
> > aware of the change.
>  
>  I agree that on 64-bit platforms we should prevent the import.  In the
>  past we only provided a warning and the users were on their own.  This
>  is different.
>  
>  If you read my massive checkin to check the return results of
>  Py_InitModule*(), you'll realize this isn't as simple as just failing
>  in Py_InitMethod*().  I was hoping to just modify Py_InitModule4() in
>  Python/modsupport.c to fail and return NULL.  That doesn't seem
>  practical given that we didn't check return results.  We will just
>  crash the interpreter with standard python 2.4 modules.
>  
>  ISTM we need to modify _PyImport_LoadDynamicModule() in
>  Python/importdl.c before calling the init function (line 56, (*p)())
>  to check for some magic symbol that is defined only when compiling 2.5
>  and above.  For example we could add a static int  _64_bit_clean = 1;
>  in modsupport.h.  Without some trickery we will get this defined in
>  every .o file though, not just modules.
>  
>  Other ideas?

We could explicitly break binary compatibility for Python 2.5
on 64-bit platforms, by changing the name of an often used
API, e.g. the Py_InitModule*() APIs.

This is how Unicode does it - we map the various APIs to
either ...UCS2 or ...UCS4, so that you cannot import an
extension compiled for e.g. UCS2 into a Python interpreter
compiled for UCS4. If we didn't, you'd get seg faults and
buffer overflows the same way you would with the ssize_t
change on 64-bit platforms.

-- 
Marc-Andre Lemburg
eGenix.com

Professional Python Services directly from the Source  (#1, Jan 19 2006)
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