build.rs

extern crate cc;
extern crate glob;

#[cfg(not(feature = "orangepi"))]
const TARGET: &'static str = "wiringPi";
#[cfg(feature = "orangepi")]
const TARGET: &'static str = "WiringOP";

fn main() {
    if cfg!(feature = "development") {
        return;
    }

    // only build wiringpi/wiringop for arm/armv7 platforms

    let target = std::env::var("TARGET").unwrap();
    if !(target.starts_with("arm-")
        || target.starts_with("armv7-")
        || target.starts_with("aarch64"))
    {
        println!("cargo:rustc-cfg=feature=\"development\"");
        return;
    }

    let mut cc = cc::Build::new();
    cc.files(
        glob::glob(&format!("{}/wiringPi/*.c", TARGET))
            .unwrap()
            .filter_map(|x| x.ok()),
    )
    .include(format!("{}/", TARGET))
    .include(format!("{}/wiringPi/", TARGET));
    if target.starts_with("aarch64") {
        cc.flag("-mabi=lp64").flag("-O2");
    }
    cc.static_flag(true).compile("wiringpi");
}