On Nov 20, 2008, at 6:50 AM, Påhl Melin wrote:
If I were to require the use of the 64-bit ABI in my next project, which mac models would the application run on?
All currently shipping Macs are 64-bit capable. The Mac mini was the last one to be updated, in August of 2007.
And is it possible to detect at runtime if I'm running the old 32- bit ABI or the new 64-bit to enable a fallback on non-64-bit models?
Your choice of ObjC runtime is made at compile time, not at runtime. It's easy to target both 32-bit and 64-bit though, using the standard multiple architecture support provided by Mac OS X and our developer tools. For more information, see the 64-bit transitioning guides.
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