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This is a workaround to fix weak linking of frameworks that define types with availability, but then define extensions of those types without availability. This can come up if the framework itself is built with a newer deployment target than the client that uses the framework. Since the type checker only enforces that an extension has availability if the extension is less available than the deployment target, we were failing to weak link the members of the extension in this case. This is not a perfect fix; ideally such frameworks should be built with -require-explicit-availability, and all reported warnings fixed by adding explicit availability. However, it allows clients to weak link when using existing swiftinterface files that have already shipped in the mean time, and it should not cause any problems once the frameworks are properly annotated in the future. Fixes <rdar://problem/58490723>.
22 lines
1.2 KiB
Swift
22 lines
1.2 KiB
Swift
// RUN: %empty-directory(%t)
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//
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// RUN: %target-swift-frontend -enable-library-evolution -emit-module -target x86_64-apple-macosx10.60 -emit-module-path %t/weak_import_extension_helper.swiftmodule -parse-as-library %S/Inputs/weak_import_extension_helper.swift
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// RUN: %target-swift-frontend -primary-file %s -I %t -emit-ir -target x86_64-apple-macosx10.50 | %FileCheck %s --check-prefix=CHECK-OLD
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// RUN: %target-swift-frontend -primary-file %s -I %t -emit-ir -target x86_64-apple-macosx10.60 | %FileCheck %s --check-prefix=CHECK-NEW
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//
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// REQUIRES: OS=macosx
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import weak_import_extension_helper
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@available(macOS 10.60, *)
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public func callsExtensionMethod() {
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Foo().extensionMethod()
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}
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// CHECK-OLD: declare extern_weak swiftcc %swift.metadata_response @"$s28weak_import_extension_helper3FooVMa"
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// CHECK-OLD: declare extern_weak swiftcc void @"$s28weak_import_extension_helper3FooVACycfC"
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// CHECK-OLD: declare extern_weak swiftcc void @"$s28weak_import_extension_helper3FooV0C6MethodyyF"
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// CHECK-NEW: declare swiftcc %swift.metadata_response @"$s28weak_import_extension_helper3FooVMa"
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// CHECK-NEW: declare swiftcc void @"$s28weak_import_extension_helper3FooVACycfC"
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// CHECK-NEW: declare swiftcc void @"$s28weak_import_extension_helper3FooV0C6MethodyyF" |