[Pythonmac-SIG] A couple of universal binary questions

[Michael Glassford]

Ronald Oussoren wrote:
> On 6-jun-2006, at 18:33, Michael Glassford wrote:
> 
>> Is it possible to build a universal binary version of a Py2App/PyObjC
>> based application that runs on pre-Tiger Macs? I assume this would
>> require doing the build on a non-Intel Mac, since you generally  
>> have to
>> build it on the earliest system version you want to run it on to  
>> get the
>> right Foundation and AppKit. If so, could you point me to more
>> information on how this is done?
> 
> 
> The universal build runs on 10.3.9 or later. With some luck it might  
> run on earlier 10.3 versions as well, I haven't tested that.  If you  
> want to run on earlier versions (10.3.8, 10.2) you're basically on  
> your own because the strategy used by the universal build won't work  
> then. You'll have to use the strategy that is described by Apple on  
> ADC: build a powerpc version using GCC, probably on the earliest  
> version of OSX that you want to support and build the intel version  
> on an intel mac using GCC 4. Then use lipo to paste the ppc and intel  
> versions of binaries together.

Probably too much work to be worth it for my application, but knowing 
that's the case is useful information.

> You don't really have build on the earliest version of OSX that you  
> want to support, at least not if you're very careful and know what  
> you're doing. That's why there are SDK's that you can install with  
> Xcode.
> 
>> What's the right way to detect within the application whether its
>> running on an Intel or a PowerPC Mac? I can figure out a way on my own
>> (such as looking at sys.byteorder), but I wonder if there's an
>> "official" way.
> 
> Why do you want to know? 
 > It's generally better to write your code in
> such way that you don't have to care.  

Answered in my reply to Bob.

 > But if you really want to
> know: platform.mac_ver()[-1] is the architecture.

Thanks.


Mike