metrics 0.20.1

A lightweight metrics facade.
Documentation 
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//! 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");
}