Commits on May 27, 2021

1. [swiftpm] For development, build a local copy of PackageDescription …

   When developing sourcekit-lsp, it is useful to be able to use a released
   version of the swift toolchain. However, because we are using the latest
   branch version of libSwiftPM, it may be that the PackageDescription
   module packaged with the toolchain is incompatible with that libSwiftPM.
   To prevent that problem, we now build our own copy of PackageDescription
   and using that instead of the toolchain's. That change is made by
   default to allow plain `swift build` and `swift test` invocations to
   work without modification. When building as part of the swift toolchain,
   we continue to use the toolchain's copy of PackageDescription, because
   we know that it is built from the same sources as we are using for
   libSwiftPM.
   
   One situation that is not explicitly covered by the above is if
   sourcekit-lsp is installed somewhere outside of a swift toolchain. In
   that case by default it will try to find a local package description
   module next to the sourcekit-lsp binary, but assuming that fails it will
   fallback to searching the default toolcahin that it discovers at
   runtime, as it does today. If this usecase turns out to be important we
   can provide additional ways to control how to find the
   PackageDescription module.
   
   rdar://78548287

   

   benlangmuir committed May 27, 2021
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