Cargo Features

vanity has no features set by default.

[dependencies]
vanity = { version = "0.2.0", features = ["gpu"] }
gpu = cc

Affects vanity::Args.num_gpus

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.

cc build gpu?