Re: Garbage Collection in 10.4

FROM : Hans van der Meer
DATE : Tue Nov 06 20:09:53 2007

Thanks for the quick answer. Seems I really have to choose between 
the one and the other.

Hans van der Meer


On Nov 6, 2007, at 18:12, Shawn Erickson wrote:

> No GC using applications will not run on 10.4 systems. GC requires
> support from system provided frameworks (let alone the objc runtime)
> and that support only exists on Leopard (10.5).
>
> -Shawn


On Nov 6, 2007, at 18:22, Bill Bumgarner wrote:

> On Nov 6, 2007, at 9:04 AM, Hans van der Meer wrote:

>> My question is sligthly different: If I switch over to 10.5 and 
>> opt for garbage collection in my Cocoa programs, will these 
>> programs run under 10.4? Or do I have to maintain 2 versions, one 
>> with gc for 10.5 and one with manually managed memory for running 
>> on 10.4?
>> (I need to keep a 10.4 system running)

>
> As Shawn said, "No" -- No, you can't compile a dual mode chunk of 
> code on Leopard and deploy it on Tiger, GC or non-GC.  When 
> compiling dual mode code (or GC only code), the compiler generates 
> references to symbols that do not exist on Tiger.
>
> The real question, though, is why would you want to deploy with GC 
> enabled on Leopard if you have to support non-GC on Tiger?  Why 
> bother incurring the cost of maintaining, debugging, and optimizing 
> your code for two different memory management models?
>
> If you need to support Tiger, stick with non-GC.
>
> b.bum
>
>