[Python-Dev] Python 32- and 64-bit living together

M.-A. Lemburg mal at egenix.com
Fri Apr 11 22:06:19 CEST 2008

On 2008-04-11 20:21, Sérgio Durigan Júnior wrote:
> Hi Lemburg,
> On Fri, 2008-04-11 at 19:38 +0200, M.-A. Lemburg wrote:
>> On 2008-04-11 19:10, Sérgio Durigan Júnior wrote:
>>> Hi all,
>>> My question is simple: is there any problem when installing/using both
>>> 32- and 64-bit Python's on the same machine? I'm more concerned about
>>> header files (those installed under /usr/include/python-2.x), because as
>>> far as I could see there's nothing similar to a "#ifdef USE_64BIT" or
>>> something on them.
>> The include files are all static and can be used on both 32-bit and
>> 64-bit platforms or installations.
> Thanks :-).
>> Only the /usr/lib/python2.x files differ between 32-bit and 64-bit
>> (the configuration files are in /usr/lib/python2.x/config).
> Hmm, right. I tried to modify the installation path (using --libdir
> in ./configure) to /usr/lib64, but some *.pyo objects still are
> installed under /usr/lib. AFAIK, these objects are bitness-dependent
> (i.e., if they were generated by a 32-bit Python, they can only be
> execute by a 32-bit Python - and vice-versa), right?


> Is there any way to separate these arch-dependent files in /usr/lib
> and /usr/lib64 depending on their bitness?

There's no need for that. Only the config/ dir which is included
in the Python lib dir is dependent on the Python configuration.

> Thanks,
> P.S.: I think this "misbehaviour" of --libdir is a bug. IMHO, it should
> put every arch-dependent file in the path that the user provided.

You should probably have a look at how RedHat or openSUSE solve
these problems. Some of them have patched Python to fit their
needs. You may have to do that as well.

Marc-Andre Lemburg

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