Cargo Features

[dependencies]
crc32c-sse42 = { version = "0.0.0", default-features = false, features = ["sse42"] }
default = sse42

The sse42 feature is set by default whenever crc32c-sse42 is added without default-features = false somewhere in the dependency tree.

sse42 default

crc32c-sse42 has 2 features without comments.