I am creating a library in rust and I have different features which the user can enable via optional dependencies. I want it so if the dependency diesel is enabled than diesel-derive-enum should also be enabled.
[dependencies]
diesel = {version = "1.4.6", optional = true, features = ["postgres", "chrono"]}
diesel-derive-enum = {version = "1.1.1", optional = true, features = ["postgres"]}
As of Rust 1.60.0, with the stabilization of namespaced dependencies, you can now do this without having to add a differently named feature, using dep: features.
[dependencies]
diesel = {version = "1.4.6", optional = true, features = ["postgres", "chrono"]}
diesel-derive-enum = {version = "1.1.1", optional = true, features = ["postgres"]}
[features]
diesel = ["dep:diesel", "dep:diesel-derive-enum"]
Now you can simply pass --features diesel to cargo to enable both the diesel and diesel-derive-enum optional dependencies.
See the Cargo Book's section on Optional Features for more details.
You can use cargo features to enable multiple optional dependencies.
Here is an example:
[dependencies]
cli-color = { version = "0.1.20", optional = true }
clap= { version = "0.2.3", optional = true }
[features]
cli = ["cli-color", "clap"]
Also a real world example coming from tokio.
https://github.com/tokio-rs/tokio/blob/master/tokio/Cargo.toml
For more details see official rust docs: https://doc.rust-lang.org/cargo/reference/features.html#the-features-section