[5.5] Link the concurrency runtime against libatomic on Linux and Android #38523
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We mostly get away without this because we're fairly disciplined about using constant memory orderings, and apparently that's usually good enough to get inline accesses and avoid needing to link atomic. However, we have a few places with the task status atomic that use a non-constant load ordering with load and compare_exchange_weak, and my recent change to make that atomic a double-word was apparently sufficient on some (but not all) Linux distributions to get the compiler to call the runtime function. Regardless, we shouldn't be playing around in the margins here: Linux requires us to link libatomic, so we should.
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@swift-ci Please test |
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Windows failure is unrelated |
DougGregor
approved these changes
Jul 21, 2021
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5.5 version of #38501 and #38508. Hopefully unblocks daily toolchains.
Fixes rdar://80799993.