[Distutils] [setuptools] setuptools and fat binaries

Ronald Oussoren ronaldoussoren at mac.com
Wed Jan 4 22:38:09 CET 2006

On 4-jan-2006, at 22:26, Bob Ippolito wrote:

> On Jan 4, 2006, at 12:51 PM, Ronald Oussoren wrote:
>> Apple supports fat binaries on Mac OS X (they call them universal
>> binaries), that is binaries that contain executable code for multiple
>> architectures. In released version of the os this can be used to
>> build binaries and libraries that support both PPC and PPC64
>> architectures, which isn't used very much, and in the future this
>> will be the mechanism to support both the current PPC based systems
>> and the to-be-introduced intel systems with a single binary.
>> I'm currently playing around with Python on an Intel developer system
>> (my goal is a patch that will make it easy to build a fat/universal
>> build of Python on Mac OS X), and I wondering how setuptools (and
>> specifically eggs) can support universal binaries. The reason I ask
>> is because of eggs that contain extensions, whose name contains the
>> architecture, such as aem-0.10.0-py2.4-macosx-10.4-ppc.egg. Just
>> using two eggs, one for each architecture, would work but seems
>> wasteful and would make it harder to create self fat application
>> bundles.
> Using two or three eggs doesn't really make it any harder to create  
> an application bundle, py2app needs to change to support eggs  
> anyway and having a separate arch egg would work fine.  It might be  
> better that way because it's easy to see which packages support  
> which architectures and it's easy for someone who has the relevant  
> platform to built, test, and upload.

Someone, somewhere has to do the work, either setuptools or py2app.  
I'd like to see fat eggs to avoid duplication of all non-executable  
stuff (python files and data files).

I'd guess that in most cases just using '-arch i386 -arch ppc' in the  
extra_compile_args and extra_link_args would enable you to build a  
fat version of an extension. Building a fat egg that works on OSX  
10.3 and forward might be harder, but even there the simple solution  
might work most of the time (I haven't put much thought into that yet).

> py2app could even merge arch eggs together to make them fat at  
> build time.

If it would do that setuptools would still require some support for  
fat eggs, or do you mean that py2app would merge the two variants and  
then have a symlink from one architecture variant to the other?

> The only thing that's off is that easy_install would need to fetch  
> eggs for all architectures... maybe a pydistutils.cfg that says you  
> want to fetch "ppc ppc64 x86".
> -bob

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