build.rs

// build.rs
use bindgen;
use std::{env, fs, path::{Path, PathBuf}};

fn main() {
    let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
    fs::copy(
        "./SpeechSDK/lib/x64/libMicrosoft.CognitiveServices.Speech.core.so",
        Path::new(&out_path).join(
            "libMicrosoft.CognitiveServices.Speech.core.so"
        ),
    ).unwrap();
    fs::copy(
        "./SpeechSDK/lib/x64/libMicrosoft.CognitiveServices.Speech.extension.kws.so",
        Path::new(&out_path).join(
            "libMicrosoft.CognitiveServices.Speech.extension.kws.so"
        ),
    ).unwrap();
    fs::copy(
        "./SpeechSDK/lib/x64/libMicrosoft.CognitiveServices.Speech.extension.codec.so",
        Path::new(&out_path).join(
            "libMicrosoft.CognitiveServices.Speech.extension.codec.so"
        ),
    ).unwrap();


    println!("cargo:rustc-link-search=native={}", out_path.display());
    println!(
        "cargo:rustc-link-lib=dylib=Microsoft.CognitiveServices.Speech.core"
    );

    // The bindgen::Builder is the main entry point
    // to bindgen, and lets you build up options for
    // the resulting bindings.
    let bindings = bindgen::Builder::default()
        // The input header we would like to generate
        // bindings for.
        .header("c_api/wrapper.h")
        .clang_arg("-ISpeechSDK/include/c_api/")
        // Finish the builder and generate the bindings.
        .generate()
        // Unwrap the Result and panic on failure.
        .expect("Unable to generate bindings");

    // Write the bindings to the $OUT_DIR/bindings.rs file.
    bindings
        .write_to_file("c_api/bindings.rs")
        .expect("Couldn't write bindings!");
}