fn main() {
    // This allows "spirv" to be used in #[cfg(target_arch = "...")]
    // without triggering a warning.
    println!("cargo:rustc-check-cfg=cfg(target_arch, values(\"spirv\"))");

    // `gpu` is set for every device backend, so host-only code can be gated once
    // as #[cfg(not(gpu))] instead of naming each target. Adding a backend means
    // editing this line, not 30-odd cfg attributes.
    println!("cargo::rustc-check-cfg=cfg(gpu)");
    let target = std::env::var("TARGET").unwrap_or_default();
    if target.contains("spirv") || target.contains("cuda") {
        println!("cargo::rustc-cfg=gpu");
    }
}