Arm-Intel-PowerPC Universal Binaries Are Possible

Casual MacRumors visitors may not realize that we have a very active PowerPC forum where users discuss issues related to PowerPC Macs that have not been produced since 2006. Threads range from hardware upgrades and software options to nostalgia:

Photo by AphoticD

Apple's recently announced transition to Apple Silicon (Arm) based Macs raised some interesting questions about future support for these old machines.

In particular, MacRumors forum member Wowfunhappy asked about ongoing support for Universal binaries in the upcoming Arm-based macOS, and whether or not a four-way universal binary was possible:

During their 2020 WWDC keynote, Apple announced the reintroduction of Universal Binaries, for developers to create apps that work on both Intel and Arm Macs during the transition.

But Universal Binaries never really went away the first time! You can run PPC-Intel apps on Mojave, and I assume also Catalina. Also, many Intel-only apps are still "universal," in that they contain versions for both i386 (32bit Intel) and x86_64 (64bit Intel).

Thus, I am intensely curious: would it be possible for a developer to create a single universal binary that works natively on all four architectures: PPC, i386, x86_64, and ARM?

The answer, it appears, is yes. The TenFourFox developer blogged about the possibility, confirming that it is indeed possible:

A question I got repeatedly the last couple days was, now that AARM (Apple ARM) is a thing, is the ultimate ARM-Intel-PowerPC Universal Binary possible? You bet it is! In fact, Apple already documents that you could have a five-way binary, i.e., ARM64, 32-bit PowerPC, 64-bit PowerPC, i386 and x86_64. Just build them separately and lipo them together

TenFourFox is a Firefox port for PowerPC Macs running OS X 10.4 or 10.5. It provides those users with modern browser support. The developer actually points out that each architecture can even have its own subtype, meaning that ultimately a so-called "Super Duper Universal Binary" could have support for 17 different instruction sets, which could run on any machine from PowerPC to future Arm-based Mac with full support for all processor subtypes.

Top Rated Comments

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5 weeks ago
Came here to see who found this, of course it's the TenFourFox dev. This is awesome.
Score: 28 Votes (Like | Disagree)
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5 weeks ago
Yawn. Wake me when they decide to include a 6502 binary in the mix.
Score: 19 Votes (Like | Disagree)
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5 weeks ago
It’s amazing that things like this are possible. I’m glad that there are some people out there who devote countless hours of their lives to these noble causes.
Score: 17 Votes (Like | Disagree)
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5 weeks ago


but_why.gif

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Score: 13 Votes (Like | Disagree)
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5 weeks ago


Yawn. Wake me when they decide to include a 6502 binary in the mix.

What do you mean "they"? While macOS itself doesn't run on 6502 or 68k, the binary packaging system Apple uses for their Mach-O executables could hold an arbitrary number of architecture including 6502
Score: 11 Votes (Like | Disagree)
Avatar
5 weeks ago
a curiosity at best.
Really.... Who's still using a PPC Mac? Sure, there's lots of people with old PPC macs stuffed somewhere in a basement under that pile of ZIP drives- but actually using one?
Score: 8 Votes (Like | Disagree)

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