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Update: Xcode 12 has a fix that allows this project to work as expected.

This is project which demonstrates that the Defines Module flag on the BarKit target does not allow swiftinterface files to be generated. FooKit has it enabled and they are generated. Use script ./create_xcframework.sh to create the xcframework

Note that BarKit does not compile when using the HostAppXC version which links against the XCFramework. Disabling Defines module, then regenerating the XCFramework, on BarKit allows HostAppXC to compile and run.

See the enclosed project. Open the project and build, there are 4 targets, of those there are two frameworks, the main difference between the BarKit and FooKit frameworks is that BarKit has the Defines Module flag set to true. First build the HostApp target, this will generate FooKit.framework and Bar.framework. Next, run the ./create_xcframework script included in the root of the project. Look at the generated XCFramework. Foo.framework does not define a module and therefore generates swiftinterface files, BarKit.framework does defines a module, it does not generate swiftinterface files. Now, build the HostAppXC target, it will fail to build because the BarKit.framework has no swiftinterface files. If you turn off Defines Module for BarKit.framework, rerun ./create_xcframework, then it compiles and runs.