build.rs

#[cfg(target_os = "macos")]
fn main() {
    use std::{env, path::PathBuf, process::Command};

    let sdk_path = String::from_utf8(
        Command::new("xcrun")
            .args(["--sdk", "macosx", "--show-sdk-path"])
            .output()
            .unwrap()
            .stdout,
    )
    .unwrap();
    let sdk_path = sdk_path.trim_end();

    println!("cargo:rerun-if-changed=src/bindings.h");
    let bindings = bindgen::Builder::default()
        .header("src/bindings.h")
        .clang_arg(format!("-isysroot{}", sdk_path))
        .clang_arg("-xobjective-c")
        .allowlist_type("CMItemIndex")
        .allowlist_type("CMSampleTimingInfo")
        .allowlist_type("CMVideoCodecType")
        .allowlist_type("VTEncodeInfoFlags")
        .allowlist_function("CMTimeMake")
        .allowlist_var("kCVPixelFormatType_.*")
        .allowlist_var("kCVReturn.*")
        .allowlist_var("VTEncodeInfoFlags_.*")
        .allowlist_var("kCMVideoCodecType_.*")
        .allowlist_var("kCMTime.*")
        .allowlist_var("kCMSampleAttachmentKey_.*")
        .parse_callbacks(Box::new(bindgen::CargoCallbacks::new()))
        .layout_tests(false)
        .generate()
        .expect("unable to generate bindings");

    let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
    bindings
        .write_to_file(out_path.join("bindings.rs"))
        .expect("couldn't write dispatch bindings");
}

#[cfg(not(target_os = "macos"))]
fn main() {}