Re: [B2-devel] TESyncScrap (Thoughts on SheepShaver and Basilisk II)

[Frank T. <fra...@gm...>]

On Mon, Jun 18, 2012 at 11:54 AM, Robert Munafo <mr...@gm...> wrote:

> On 6/18/12, Josh Juran <jj...@gm...> wrote:
> > Then wouldn't it make more sense to always build as 32-bit?  It's not
> > like SheepShaver will ever even remotely need more than 4 GB of
> > address space.
>
> We need 64-bit to work in Lion (10.7) and Mountain Lion (10.8). Snow
> Leopard (10.6) is the last version that has any 32-bit runtime or a
> 32-bit kernel.
>

Not exactly. Certain kernel-related things must run in 64-bit mode, but
there is still i386 support.

{
cambridge:~ admin$ uname -v
Darwin Kernel Version 11.4.0: Mon Apr  9 19:32:15 PDT 2012;
root:xnu-1699.26.8~1/RELEASE_X86_64
cambridge:~ admin$ file /mach_kernel
/mach_kernel: Mach-O universal binary with 2 architectures
/mach_kernel (for architecture x86_64): Mach-O 64-bit executable x86_64
/mach_kernel (for architecture i386): Mach-O executable i386
}


>
> Apple is not Microsoft. They don't lift a finger for runtime binary
> backward-compatibility.
>
> Certainly true.


> > On Jun 17, 2012, at 11:41 PM, Robert Munafo wrote:
> >> Apple does not provide 64-bit runtime libraries for any of Carbon,
> >> such as is needed to convert PICT scrap data into another bitmap
> >> format. In fact, all of QuickDraw is missing, and you can't even view
> >> a PICT image on your Leopard (or later) Mac if you have it set to boot
> >> with the 64-bit kernel (except by transferring the PICT data into an
> >> emulator running an older Mac OS).
>
> --
>  Robert Munafo  --  mrob.com
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