Lib.rs

Cargo Features

[dependencies]
libc = { version = "1.0.0-alpha.1", default-features = false, features = ["std", "rustc-dep-of-std", "extra_traits"] }

default = std

The std feature is set by default whenever libc is added without default-features = false somewhere in the dependency tree.

std default

rustc-dep-of-std = rustc-std-workspace-core

extra_traits

Features from optional dependencies

In crates that don't use the dep: syntax, optional dependencies automatically become Cargo features. These features may have been created by mistake, and this functionality may be removed in the future.

rustc-std-workspace-core rustc-dep-of-std?