How do I 'pass down' feature flags to subdependencies in Cargo?

问题

I'm writing a library in Cargo. If this library depends on another library like libc, which exposes a feature (in this case, use_std), how do I make a feature I expose enable or disable that feature in my dependency?

Looking at the cargo documentation, it looks like there's no official way specified to do this.

回答1:

From the documentation you linked to:

# Features can be used to reexport features of other packages. The `session`
# feature of package `awesome` will ensure that the `session` feature of the
# package `cookie` is also enabled.
session = ["cookie/session"]

Is that sufficient?

来源：https://stackoverflow.com/questions/40021555/how-do-i-pass-down-feature-flags-to-subdependencies-in-cargo