The 17.1.6 Bazel migration dropped maudio's generate-bindings feature, so
the darwin addon shipped maudio-sys's Linux-shaped pregenerated miniaudio
bindings. Those bindings omit the MA_SUPPORT_COREAUDIO backend-state union
members that the macOS build of miniaudio.c actually contains, producing a
Rust/C ABI mismatch: capture callbacks saw zero channels and yielded no PCM.
Re-enable generate-bindings for apple targets only. Patch maudio-sys's build
script to branch on Cargo's TARGET rather than the build-script host, so a
macOS-hosted Linux/Windows cross-build keeps target-family pregenerated
bindings instead of incorrectly running Darwin bindgen. Repin the Bazel graph
to apply the patch and gate bindgen behind the apple target selects.
Fixes#6846
zig 0.14's cache corrupts under concurrent `zig cc` (ziglang/zig#18763):
with ~60 cc-compiling cargo build scripts running in parallel, cache
manifests end up referencing evicted objects ("failed to open
.../scanner.o: FileNotFound") and kill the build. Patch the hermetic
wrapper via single_version_override so compile-only steps (-c/-E/-S) get
private throwaway caches under the system tmp dir — cold vs warm is
~25ms for compiles, measured — while links keep the shared cache for
compiler-rt/crt reuse (~6s cold, 25ms warm) under zig's per-artifact
locking.
Oleg Pulatov