Pass explicit -target to zig on macOS - #258
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sywhang
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Jul 13, 2026
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On macOS 26 (Xcode/CommandLineTools with MacOSX26.x.sdk), bazel build //rules:cp and ci/zig-utils both fail with undefined-symbol link errors (_abort, _getenv, _sigaction, __availability_version_check, …).
Root cause
Both code paths invoke zig without a -target, so zig links against the host macOS SDK's libSystem.tbd. Zig 0.14.0's TAPI parser can't parse the tbd shipped with newer Xcode SDKs (ziglang/zig#23324) and silently yields zero symbols. Confirmed by isolation: the same commands with -target aarch64-macos-none or an older SDK sysroot link and run.
Fix
Pass an explicit -target on macOS only, so zig links against its bundled hermetic libc stubs instead of the host SDK. Linux and Windows are untouched — they build natively as before (Linux glibc detection works, Windows bundles mingw-w64 libc).