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Re: End of 32-bit
10/31/19 04:23 AM
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> Meanwhile, Macs have been 64-bit only since way back in 2011 when OS X Lion came out.
>
> I don't think that is true. This recent update (Catalina) is the first time Mac has
> gone 64-bit only. Up until now, it did both.
>
> But regardless, I agree with your post.
Catalina is the first version of macOS that won't run 32-bit applications. Assuming the poster you're replying to is correct, Lion (2011) was the first version that only shipped a 64-bit kernel. I can't remember the exact timeline, but Apple stopped providing 32-bit kernels and dropped support for 32-bit EFI years ago while still including a 32-bit userland, allowing 32-bit applications to run.
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