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Can you please tell me if MacOS X 10.5.8 on MacBook Pro a 32 bit environment or a 64 bit environment?

Thank you.

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migrated from stackoverflow.com Jan 6 '11 at 22:55

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Mac OS X 10.5 has a 32 bit kernel but is capable of natively supporting both 32 bit and 64 bit user space programs.

Edit

By the way, the original MacBook Pros only had a 32 bit processor. If it is one of these, you are 32 bit only.

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There's also a 64bit kernel, but it needs to be activated manually. –  Daniel Beck Jan 7 '11 at 9:51
    
@Daniel: I know there are two kernels for 10.6, but I thought the 10.5 kernel was 32 bit only. –  JeremyP Jan 7 '11 at 9:58
    
10.5. True. That's 32 bit. Sorry about that. –  Daniel Beck Jan 7 '11 at 10:03

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