[PD-dev] Macs to transition to ARM processors

[Christof Ressi]

> but knowing Apple they might well change the file format anyhow just to force some more upgrades
Yes, from what I understood from the articles I've read, they want to 
create a new file format for fat x86_64 / arm binaries.

What I don't understand is: the FAT format already supports all kinds of 
binaries, including ARM64 (CPU_TYPE_ARM64). Also, I don't see why apple 
shouldn't be able to keep supporting existing x86_64 binaries (FAT or 
mach-O) on their ARM machines...

But I'm sure they have technically convincing reasons for this :-p. But 
let's see.

Christof

On 23.06.2020 05:43, Miller Puckette via Pd-dev wrote
> Hi Dan and others -
>
> The "fat" binary format itself might not have to be changed to allow another
> architecture to be added, but knowing Apple they might well change the file
> format anyhow just to force some more upgrades.  But regardless it will be
> necessary to recompile all externs (and Pd itself) to add the arm arcitecture.
> I doubt I'll be able to do that on my old Mac.  It might be time I investigated
> whether cross-compiling from linux is at all feasible.
>
> cheers
> Miller
>
> On Mon, Jun 22, 2020 at 11:24:04PM +0200, Dan Wilcox wrote:
>> Howdy all,
>>
>> Apple announced today that it will transition from Intel to its own Arm processors. What this will bring is:
>>
>> * Universal 2: x86_64 & arm fat binaries
>> * Rosetta 2: emulation layer from x86_64 to arm
>>
>> For Pd, this means that current binaries will most likely *run* but who knows how the performance will be good for realtime DSP. OTOH, they did demo a game and some virtualization support so it seems they have focused on making things run as well as they can.
>>
>> Building Pd itself for macOS arm should be relatively easy, just a different arch target. For externals, this would may require an additional fat lib type, perhaps dfat_2? Note, I believe the distinction will be important for us since we still have "Universal 1" builds. As with the Pd core, updating pd-lib-builder should also be relatively easy by adding the new arch targets, depending on what they are.
>>
>> For deken, this means recompiling and uploading the new fat type.
>>
>> I don't imagine it will be possible to have a "fatter lib" which supports ppc, x86, x86_64, & arm. I believe the writing is on the wall for the eventual need for a build system newer then OS X 10.6.
>>
>> --------
>> Dan Wilcox
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