//! This build script detects target platforms that lack proper support for
//! atomics and sets `cfg` flags accordingly.
use std::env;
fn main() {
// CAS is not available on thumbv6.
let target = env::var("TARGET").unwrap();
if !target.starts_with("thumbv6") {
println!("cargo:rustc-cfg=atomic_cas");
}
println!("cargo:rerun-if-changed=build.rs");
}