ac80bff added a libc-based batched recv_batch for the Apple/BSD targets
(cfg(all(unix, not(target_os = "linux")))) but left libc declared only under
cfg(target_os = "linux"). The macOS host build pulls libc in transitively so it
compiled, but the iOS/tvOS cross-compiles (no transitive libc, dev-deps off) failed
with E0433 "cannot find crate libc", breaking the full xcframework build. Widen the
gate to cfg(unix): libc is now used by sendmmsg/recvmmsg on Linux AND recv() on the
other unix (Apple/BSD) targets.
Verified: cargo build --release -p punktfunk-core --features quic for
aarch64-apple-ios, x86_64-apple-ios, and aarch64-apple-tvos (-Z build-std) all link.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
enricobuehler
1f164b0d48