autocfg

53.4M downloads in the last 30 days (1.8M/day), up 20% from the previous period.

972 crates depend on autocfg. Reasonable ecosystem adoption, though not yet a core dependency.

The API has been stable (1.x) for over 7 years with 17 releases. This level of maturity means you can depend on it without worrying about breaking changes.

autocfg has no external dependencies — minimal supply chain risk and fast compile times.

At 18KB, autocfg is lightweight. Small crate size correlates with focused, well-scoped functionality.

Notable dependents include num-traits, memoffset, num-iter, async-io, matrixmultiply. When high-quality crates choose autocfg, it's a strong quality signal.