🍒[cxx-interop] Make usages of Swift Span @_alwaysEmitIntoClient in the overlay
#82341
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…he overlay This fixes a regression where projects that use the C++ stdlib overlay stop building because of a linker error: ``` ld: Shared cache eligible dylib cannot link to ineligible dylib '@rpath/libswiftCompatibilitySpan.dylib'. ``` Usages of `Span<T>` would generally cause a type metadata accessor to be emitted for `Swift.Span`. This becomes a problem with backdeployment, since Span is partially defined in a compatibility binary. This change adds `@_alwaysEmitIntoClient` to generic usages of `Span` to prevent the type metadata accessor from being emitted into `libswiftCxx.a`. rdar://152192080
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@swift-ci please test |
airspeedswift
approved these changes
Jun 20, 2025
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Usages of
Span<T>would generally cause a type metadata accessor to be emitted forSwift.Span. This becomes a problem with backdeployment, since Span is partially defined in a compatibility binary.@_alwaysEmitIntoClientto generic usages ofSpanin the Cxx module to prevent the type metadata accessor from being emitted intolibswiftCxx.a.@_alwaysEmitIntoClientin the overlay #82309@_alwaysEmitIntoClient.