std.Build.Watch: add macOS implementation based on FSEventStream #24649
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mlugg
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This issue has been fixed in ziglang/zig#24649. The workaround can be removed completely when it's safe to assume that the majority of projects and users have updated to Zig 0.15.
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This issue has been fixed in ziglang/zig#24649. The workaround can be removed completely when it's safe to assume that the majority of projects and users have updated to Zig 0.15.
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On macOS, instead of using the broken kqueue implementation, use the File System Events API in the Core Services framework to implement
std.Build.Watch. This API is a bit different to others, because it is based on recursive watches, and it also requires using Apple's "dispatch queue" mechanism instead of just being a simple blocking call. The implementation is mostly contained within its own file, asstd.Build.Watch.FsEvents, and is designed to not be too tightly coupled tostd.Buildso that in the future it can potentially be refactored into a more general-purpose filesystem watching tool.Basic testing from myself, and tests from a few affected users, have confirmed this as working, resolving the longstanding issue that
zig build --watchoften does not work correctly on macOS.Resolves: #21905