gecko-dev/gfx/qcms/build.rs

fn main() {
    if cfg!(feature = "neon") {
        println!("cargo:rustc-env=RUSTC_BOOTSTRAP=1");
    }
    let target = std::env::var("TARGET").expect("TARGET environment variable not defined");
    if target.contains("neon") {
        println!("cargo:rustc-cfg=libcore_neon");
    }
}