Lib.rs

Cargo Features

[dependencies]
libc = { version = "0.2.153", default-features = false, features = ["std", "align", "rustc-dep-of-std", "const-extern-fn", "use_std"] }

default = std

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

std default use_std?

align rustc-dep-of-std?

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

extra_traits const-extern-fn

use_std = std

use_std is deprecated, use std instead

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?