On Jul 17, 2012, at 11:31 AM, Martin Hewitson wrote:

> On 17, Jul, 2012, at 05:42 PM, Sean McBride <s...@rogue-research.com> wrote:
> 
>> On Tue, 17 Jul 2012 12:30:39 +0200, Martin Hewitson said:
>> 
>>> This started to appear during the process of going from GC to non-GC.
>> 
>> What do you mean "non-GC"?  I strongly suggest going from GC to ARC, not 
>> from GC back to the stone-age retain-release.  Although quite different 
>> 'under the hood', writing for GC and ARC is not so different, and you can 
>> even switch over slowly.
> 
> That was my original plan, but ARC is 64-bit only, right? I'm not sure I'm 
> ready to drop 32-bit support yet, at least not without canvasing opinion from 
> the users.
> 
> Martin

I’ve got an app that’s backward-compatible all the way to 10.4/PPC, to which I 
added Sparkle support about half a year ago. In that half year, according to 
the Sparkle stats, 93.99% of my users have been on 64-bit Intel CPUs. Of the 6% 
who are not on 64-bit Intel, only  2.72% are using 32-bit Intel, followed by 
1.91% on 32-bit PPC and 1.38% on 64-bit PPC (i.e. the G5).

Needless to say, the next major release of my app will not be 
backward-compatible all the way to 10.4/PPC. I’d caution against putting too 
much effort into supporting what may well be a statistically insignificant 
portion of your user base. If you’re porting from GC, port it to ARC, and 
you’ll save yourself a great deal of time and headaches.

Charles

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