libc

0.2.186 is raw FFI bindings to platform C standard library interfaces for 80+ target triples. The published crate is byte-for-byte identical to VCS (excluding Cargo normalization). The build script detects ABI variants via rustc/host-tool version probing and emits only cfg directives. No runtime I/O, no crypto, no concurrency, no dependencies beyond an optional rustc-std shim. Unit tests cover the macro helpers. No findings.