环境

• Rust 1.56.1
• VSCode 1.61.2
• Windows 7
• mingw64 7.3.0

概念

参考：https://stackoverflow.com/questions/40833078/how-do-i-specify-the-linker-path-in-rust

示例

Cargo.toml

[package]
name = "rust"
version = "0.1.0"
edition = "2021"
build = "build.rs"

[dependencies]

build.rs

该文件放到项目根目录，src 文件夹的上一层。

fn main() {
    // cargo:rustc-link-search= 后跟上静态库或者动态库的路径，到文件夹
    println!(r"cargo:rustc-link-search=C:\Users\jiangbo\work\rust");
}

main.rs

#[link(name = "add")]
extern "C" {
    fn add(a: i32, b: i32) -> i32;
}

fn add_with_c(a: i32, b: i32) -> i32 {
    unsafe { add(a, b) }
}

fn main() {
    let sum = add_with_c(7, 8);
    println!("{}", sum);
}

add.c

int add(int a, int b)
{
    return a + b;
}

生成库

gcc -c add.c
ar cr libadd.a add.o

总结

了解了 Rust 中外部函数接口的使用。

附录