cortex-m-rtfm 0.2.1

Real Time For the Masses (RTFM) framework for ARM Cortex-M microcontrollers
Documentation
use std::env;

fn main() {
    let target = env::var("TARGET").unwrap();

    if target.starts_with("thumbv6m-") {
        println!("cargo:rustc-cfg=armv6m");
    }

    println!("cargo:rerun-if-changed=build.rs");
}