[5.x] Compile Apple tools as fat binaries if possible #14181
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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. Closes bazelbuild#13452. PiperOrigin-RevId: 405842940 (cherry picked from commit 80c56ff)
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cc @Wyverald |
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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.
Closes #13452.
PiperOrigin-RevId: 405842940
(cherry picked from commit 80c56ff)
This just missed 5.x, original PR here #13452