[Python-Dev] Python 2.7 Mac universal builds seem broken on trunk (original) (raw)

Ronald Oussoren ronaldoussoren at mac.com
Tue Sep 29 18:22:25 CEST 2009

On 29 Sep, 2009, at 18:17, M.-A. Lemburg wrote:

Ronald Oussoren wrote:

Use:

./configure --enable-framework --enable-universalsdk=/ The --with-universal-archs flag selects whichs architectures should be included when you build a universal binary, defaulting to 32-bit. The Python default on 10.6 is 64-bit, so wouldn't it be better to default to that on 10.6 and use 32-bit as default on 10.3/4/5 ?! Defaulting to a 32-bit build has several advantages. The first is that the defaults match the binary installer on the python.org website, What build options does that installer use ? (the web-page doesn't say)

The installer is build using the script in Mac/BuildScript, and uses -- enable-framework --with-universalsk.

This creates a 32-bit fat build that runs on 10.3.9 or later.

and secondly there are still 3th-party libraries that don't work in 64- bit mode (mostly GUI libraries, until recently Tk and wxWidgets wrapped the Carbon libraries which are not available in 64-bit mode; AFAIK both have betas that wrap the Cocoa libraries instead).

To mimick the system default you'd have to default to 32-bit on 10.4, 4-way universal on 10.5 and 3-way universal on 10.6, and that is without considering deployment targets. All of those are available as options, I'd prefer to keep it this way for now to keep things simple. Hmm, so I guess the only way to support them all is by building extensions using 4-way universal on 10.5. No wonder they are called "fat" binaries ;-)

I like the technology though, much more convenient than having
parallel directory tries as on Linux.

I'll write some documentation on the build options on OSX, but don't know what's the best location to do so.

Please put that information into Mac/README which already has documentation for how to build universal binaries on Mac. I know that, I wrote most of that file ;-). Which is why I was surprised you asked :-)

I hoped to find a document on docs.python.org that explains how to
install Python, but sadly enough there isn't. Mac/README contains the
right information, but isn't easily found if you're searching on the
web or even if you're looking for documentation in the source tree.

Ronald -------------- next part -------------- A non-text attachment was scrubbed... Name: smime.p7s Type: application/pkcs7-signature Size: 2224 bytes Desc: not available URL: <http://mail.python.org/pipermail/python-dev/attachments/20090929/304004e4/attachment.bin>

More information about the Python-Dev mailing list