References to _swift_FORCE_LOAD* symbols should be weak #24259
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When Swift always copied the overlay dylibs into app bundles, it was OK for these symbol references to be non-weak, but with the overlays now part of the OS on Apple platforms, we need to handle backward deployment scenarios where a new overlay does not exist on an old OS version. A weak reference will serve to pull in the overlay dylib if it exists, without causing a fatal error if it does not. rdar://problem/50110036
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@swift-ci please test |
PE/COFF does not provide weak import semantics. Fallback to strong import semantics on PE/COFF.
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@swift-ci please test |
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Build failed |
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AnnaZaks
approved these changes
Apr 25, 2019
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Cherry-pick #24242 to swift-5.1-branch-04-24-2019
rdar://problem/50110036