将basic rust程序链接到子文件夹中的rlib

.../rust/

我使用此链接开始使用工具: https://medium.com/@wizofe/cross-compiling-rust-for-arm-e-g-raspberry-pi-using-any-os-11711ebfc52b

• cargo new --bin rust_test . 这就产生了 .../rust/rust_test .
• cargo build 或 cargo build --target=armv7-unknown-linux-gnueabihf (给我的小猎犬)

到现在为止,一直都还不错。现在我想创建一个可以与其他项目共享的库。但我会在rust_test文件夹中创建它 .../rust/rust_test/utils :

• 创建库时使用: cargo new --lib utils
• 我可以在 utils 货物建造
• 现在我想让我的rust_测试项目作为一个依赖项来构建它,我发现我只需要添加: utils = { path = "utils" } 我的rust_test.toml文件。
• 货物建造

再说一遍,到目前为止一切都很好。对我来说,难题的最后一部分是在utils库中使用函数。里面有两个功能。一个叫 adder(a,b) test123() . 这就是我被困的地方。公式化这些函数的语法似乎都不正确。

以下是我的主要文件:

锈蚀试验

.../rust/rust_test/

货物.toml

[package]
name = "rust_test"
version = "0.1.0"
authors = ["adadachanji@gmail.com <adadachanji@gmail.com>"]
edition = "2018"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
utils = { path = "utils" }

mod utils;

fn main() {
    println!("Hello, world!");

    utils::test123();    // ??? - does not work
}

实用工具

.../rust/rust_test/utils/

货物.toml

[package]
name = "utils"
version = "0.1.0"
authors = ["adadachanji@gmail.com <adadachanji@gmail.com>"]
edition = "2018"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]

图书馆

#[cfg(test)]
mod tests {
    #[test]
    fn adder<T>(a: T, b: T) -> T {
        return a + b;
    }
}

#[cfg(utils)]
mod utils {
    #[utils]

    fn test123() {
        println!("test!");
    }
}

输出

~/bbb/development/rust/rust_test$ cargo build
   Compiling rust_test v0.1.0 (/home/user/bbb/development/rust_test)
error[E0583]: file not found for module `utils`
 --> src/main.rs:1:1
  |
1 | mod utils;
  | ^^^^^^^^^^
  |
  = help: to create the module `utils`, create file "src/utils.rs"

error[E0425]: cannot find function `test123` in module `utils`
 --> src/main.rs:6:12
  |
6 |     utils::test123();    // ??? - does not work
  |            ^^^^^^^ not found in `utils`

error: aborting due to 2 previous errors

Some errors have detailed explanations: E0425, E0583.
For more information about an error, try `rustc --explain E0425`.
error: could not compile `rust_test`.

#[cfg...] #[...] 行不行。但从我所读到的我认为 mod utils;

也许我还没有链接这些文件-我只是建立了它们?

所以问题是我现在需要做什么来将我的库链接到我的应用程序,这样我就可以使用lib函数了 ?

更新

mod utils公司;

user@user-VirtualBox:~/bbb/development/rust/rust_test$ cargo build
   Compiling rust_test v0.1.0 (/home/user/bbb/development/rust_test)
error[E0425]: cannot find function `test123` in crate `utils`
 --> src/main.rs:4:12
  |
4 |     utils::test123();    // ??? - does not work
  |            ^^^^^^^ not found in `utils`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0425`.
error: could not compile `rust_test`.