cortex-m-rt 0.3.7

Minimal runtime / startup for Cortex-M microcontrollers
Documentation 
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use std::env;
use std::fs::File;
use std::io::Write;
use std::path::PathBuf;

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

    has_fpu(&target);
    is_armv6m(&target);

    // Put the linker script somewhere the linker can find it
    let out = &PathBuf::from(env::var_os("OUT_DIR").unwrap());
    File::create(out.join("link.x"))
        .unwrap()
        .write_all(include_bytes!("link.x"))
        .unwrap();
    println!("cargo:rustc-link-search={}", out.display());

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

fn has_fpu(target: &str) {
    if target.ends_with("eabihf") {
        println!("cargo:rustc-cfg=has_fpu");
    }
}

fn is_armv6m(target: &str) {
    if target.starts_with("thumbv6m-") {
        println!("cargo:rustc-cfg=armv6m");
    }
}