build: auto-vendor SwiftSystem when not provided #443
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Swift now requires CMake 3.19.6 as a minimum version. Assume that we can use CMake newer than 3.16 and simplify the build rules.
When SwiftSystem is not provided to be built against explicitly (i.e. `-D SwiftSystem_DIR=...`), vendor a copy of SwiftSystem to allow the library to be built by including and building its dependencies. This behaviour is similar to how SPM based builds function.
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@swift-ci please test |
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@tomerd can we just cut the swift-system dependency actually? IIRC, it was eagerly added in anticipation of using its path type but we have no plans to actually use that anymore. |
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@neonichu hmm, we can for the vendoring path, but the non-vendored path needs it as imports are public still, and TSC has a dependency on System. |
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Right, what I mean is that the dependency doesn't actually have any purpose. I opened a PR to remove it: #448 |
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When SwiftSystem is not provided to be built against explicitly (i.e.
-D SwiftSystem_DIR=...), vendor a copy of SwiftSystem to allow thelibrary to be built by including and building its dependencies. This
behaviour is similar to how SPM based builds function.