My rust cargo examples folder can't use the cargo project

help
#1

Here's my Cargo.toml:

[package]
name = "smoltcp_plus"
version = "0.1.0"

Here's what I'm doing in examples/http_smol_tcp_tun_example.rs:

use smoltcp_plus::virtual_tun::smol_stack::SmolStack;

When I run cargo build --examples, I get:

  --> examples/http_smol_tcp_tun_example.rs:19:5
   |
19 | use smoltcp_plus::virtual_tun::smol_stack::SmolStack;
   |     ^^^^^^^^^^^^ use of undeclared type or module `smoltcp_plus`

I have both main.rs and lib.rs in src, they export

pub mod virtual_tun;
pub use virtual_tun::VirtualTunInterface;

I don't get why I can't use the package smoltcp_plus as it's the cargo package name

#2

Direct dependencies of tests/ or examples/ other than the current crate should be declared under the [dev-dependencies] section of the Cargo.toml.

#3

but the dependency is the crate itself. I even have another project for which I can simply do use my_crate_name in examples

#4

Is there an edition = "2018" entry in there?

#5

yes

[package]
name = "smoltcp_plus"
version = "0.1.0"
authors = ["lz me@lucaszanella.com"]
edition = "2018"

#6

I did some test and this setup works.

Cargo.toml

[package]
name = "smoltcp_plus"
version = "0.1.0"
authors = ["lz me@lucaszanella.com"]
edition = "2018"

src/lib.rs

pub const FOO: &str = "foo";

examples/http_smol_tcp_tun_examples.rs

fn main() {
    println!("{}", smoltcp_plus::FOO);
}
#7

Is there a [lib] section too? Can you paste the whole Cargo.toml?

#8

here's lib.rs:

pub mod virtual_tun;
pub use virtual_tun::VirtualTunInterface;

#[cfg(test)]
mod tests {
    #[test]
    fn it_works() {
        assert_eq!(2 + 2, 4);
    }
}

Here's the whole Cargo.toml:

[package]
name = "smoltcp_plus"
version = "0.1.0"
authors = ["lz <me@lucaszanella.com>"]
edition = "2018"

[dependencies]
log = { version = "0.4.4", default-features = false, optional = true }
libc = { version = "0.2.18", optional = true }
rand = { version = "0.3" }
#smoltcp = {git = "https://github.com/lucaszanella/smoltcp/", branch="ip-interface-alt-managed"}
smoltcp = { path = "./smoltcp" }
#managed = { git = "https://github.com/smoltcp-rs/rust-managed", features = ["map"] }

[dev-dependencies]
env_logger = "0.5"
getopts = "0.2"
rand = "0.3"
url = "1.0"
log = "0.4.4"

#[dependencies.smoltcp]
#git = "https://github.com/lucaszanella/smoltcp/"
#rev = "8f9102a3ff6af18d8161f2d69102bffa1aebe6ba"
#features = ["std", "phy-tun_interface", "proto-ipv4", "proto-ipv6", "socket-tcp"]

[lib]
crate-type=["cdylib", "staticlib"]

Does it matter that this project is inside another cargo project? The other project which is also inside works fine

#9

You'll need to build your library as an rlib to use it from other Rust files:

[lib]
crate-type=["cdylib", "staticlib", "rlib"]