SwiftAsync: use runtime-provided flag for extended frame if back-deploying #3191
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…oying When back-deploying Swift async code we can't always toggle the flag showing an extended frame is present because it will confuse unwinders on systems released before this feature. So in cases where the code might run there, we `or` in a mask provided by the runtime (as an absolute symbol) telling us whether the unwinders can cope. When deploying only for newer OSs, we can still hard-code the bit-set for greater efficiency. rdar://79357449
Since Xcode 13, ld64 requires linking libSystem for all the executable. Fix the tests that needs to run ld64 by linking libSystem from sysroot. rdar://77332728 Reviewed By: fhahn Differential Revision: https://reviews.llvm.org/D104332
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SwiftAsync: use runtime-provided flag for extended frame if back-deploying
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SwiftAsync: use runtime-provided flag for extended frame if back-deploying
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When back-deploying Swift async code we can't always toggle the flag showing an
extended frame is present because it will confuse unwinders on systems released
before this feature. So in cases where the code might run there, we
orin amask provided by the runtime (as an absolute symbol) telling us whether the
unwinders can cope.
When deploying only for newer OSs, we can still hard-code the bit-set for
greater efficiency.