embassy-sync 0.5.0

no-std, no-alloc synchronization primitives with async support
Documentation 
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use std::env;
use std::ffi::OsString;
use std::process::Command;

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

    let rustc = env::var_os("RUSTC").unwrap_or_else(|| OsString::from("rustc"));

    let output = Command::new(rustc)
        .arg("--version")
        .output()
        .expect("failed to run `rustc --version`");

    if String::from_utf8_lossy(&output.stdout).contains("nightly") {
        println!("cargo:rustc-cfg=nightly");
    }

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

    if target.starts_with("thumbv6m-") {
        println!("cargo:rustc-cfg=cortex_m");
        println!("cargo:rustc-cfg=armv6m");
    } else if target.starts_with("thumbv7m-") {
        println!("cargo:rustc-cfg=cortex_m");
        println!("cargo:rustc-cfg=armv7m");
    } else if target.starts_with("thumbv7em-") {
        println!("cargo:rustc-cfg=cortex_m");
        println!("cargo:rustc-cfg=armv7m");
        println!("cargo:rustc-cfg=armv7em"); // (not currently used)
    } else if target.starts_with("thumbv8m.base") {
        println!("cargo:rustc-cfg=cortex_m");
        println!("cargo:rustc-cfg=armv8m");
        println!("cargo:rustc-cfg=armv8m_base");
    } else if target.starts_with("thumbv8m.main") {
        println!("cargo:rustc-cfg=cortex_m");
        println!("cargo:rustc-cfg=armv8m");
        println!("cargo:rustc-cfg=armv8m_main");
    }

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