Debian GNU/Linux has been building binaries for multiple architectures for some time now.
Lee Azzarello

The main difference is that Debian only builds packages that are already in Debian. Apple has to handle arbitrary app submissions of potentially malicious code that they don’t have the source code to.

I assume Apple’s code building and signing infrastructure is heavily fortified and sandboxed and that they investigate every time LLVM dumps core trying to build someone’s app. Knowing LLVM, this is probably not infrequent.

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