Re: [Pythonmac-SIG] building universal binaries

[Ronald Oussoren]

On 27-jan-2006, at 4:02, Bob Ippolito wrote:

On Jan 26, 2006, at 6:28 PM, Kevin Ollivier wrote:

On Jan 26, 2006, at 12:48 AM, Ronald Oussoren wrote:

[snip]

I'm (very slowly) playing around with adding '-arch ppc -arch i386'
to the build flags and building on an intel host. That way you won't
have to use SDKs, which makes it less likely that configure picks up
other information than the actual compile (not that there should be
any differences if you use the 10.4u SDK).

With some effort it should be possible to build a version of python
that will run on 10.3 as well. As far as python is concerned the

I'd like to do this instead of merging a build-on-10.3 PPC version
and a build-on-10.4 intel version is that the latter would contain
small incompatibilities between the intel and ppc version (some
scripts would work on intel but not on ppc).

differences between 10.3 and 10.4 seem to be fairly small. The reason

IMHO, what would be cool is to allow the user to pass the SDK in as


./configure <flags> MACOSX_SDK=/my/path/to/SDK

This, along with the addition of the -arch i386 -arch ppc flags would
be enough to enable someone to write a script to create a Panther-
compatible Universal build. Which I'm pretty sure someone will do
sooner or later. :-)

some sort of configure flag or maybe a shell variable, something like:

No, it wouldn't actually. The 10.3 SDK is ppc only, and a Panther- compatible build (well, something compatible with 10.3.8 and below) must use GCC 3.3, but an x86 compatible build must use GCC 4.

Ronald

The compiler issue really is a problem, although we could probably hack around this using a script that runs the actual compilers and then using lipo to merge the result. As I said before, it should be possible to build a 10.3.0 compatible build using the 10.4 SDK. This does require patching several modules (posixmodule.c is one of them) because 10.4 has several functions that are not available on earlier editions of the OS. I seem to have removed that patch from my system, but recreating it shouldn't be very hard now that I know how to do it. Getting it accepted into the Python repository might be a different story. The advantage of building on 10.4 is that the Intel and PPC versions will have the same features when run on a Tiger system.

-bob

In other words, something Panther compatible needs to use different compilers with totally different options for x86 and PPC. It's not going to be easy, distutils doesn't come anywhere near close to supporting anything like that and neither does autoconf. I think the only approach that doesn't require hacking a significant amount of Python's build process and distutils is to have two Python installations, one x86 only and one PPC only. For distribution, you would cook up some way to lipo it all together.

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