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The new Darwin SDK pattern relies on an effectively empty, stub libc implementation. The actual libSystem to be linked is located dynamically based on the active SDK for the target. Independent build, host, and target SDKs are all supported by Darwin. The stub libSystem contains empty `include` and `lib` folders to avoid warnings from wrappers that add those paths unconditionally, which can turn into errors when a package is building with warnings-as-errors. While it would be nice if a fallback libc could be provided, SDK headers are not compatible between framework versions. Providing a fallback risks mixing headers from different frameworks, which can result in hard to diagnose errors involving semicolons or other punctuation. |
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