Commits on Oct 6, 2021

1. Compile Apple tools as fat binaries if possible …

   The Apple toolchain has 2 native binaries that are inputs to every
   single action. Because of this if you want to share caches between Apple
   Silicon machines and Intel machines, you either need to force them to be
   x86_64 binaries and suffer the performance loss on Apple Silicon
   machiens, or use fat binaries so the sha's match on both architectures,
   which is what this change does. These binaries are so small that the
   size impact of this doesn't matter. Since Apple Silicon support requires
   Xcode 12 this falls back to compiling the single architecture binary if
   it fails, under the assumption that means you're on Xcode 11 or lower.
   We don't have a better indication at this point of what Xcode version
   you're using, so this seems like a fine workaround until Xcode 12 is the
   minimum supported version.

   

   keith committed Oct 6, 2021
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