use std::env; fn main() { let target = env::var("TARGET").unwrap(); if target.starts_with("thumbv6m-") { println!("cargo:rustc-cfg=armv6m"); } else if target.starts_with("thumbv7m-") { println!("cargo:rustc-cfg=armv7m"); } else if target.starts_with("thumbv7em-") { println!("cargo:rustc-cfg=armv7m"); } if target.ends_with("-eabihf") { println!("cargo:rustc-cfg=has_fpu"); } println!("cargo:rerun-if-changed=build.rs"); }