fn add_file<'a>(build: &'a mut cc::Build, name: &'a str) -> &'a mut cc::Build {
    println!("cargo:rerun-if-changed={}", name);
    build.file(name)
}

fn main() {
    println!("cargo:rerun-if-changed=libm/private.h");

    let mut build = cc::Build::new();

    build
        .compiler("clang")
        .flag("-ffreestanding")
        .flag("-nostdlib");

    add_file(&mut build, "libm/s_truncf.c");
    add_file(&mut build, "libm/s_ceilf.c");
    add_file(&mut build, "libm/s_floorf.c");
    add_file(&mut build, "libm/s_fabsf.c");
    add_file(&mut build, "libm/s_scalbnf.c");
    add_file(&mut build, "libm/s_copysignf.c");
    add_file(&mut build, "libm/e_powf.c");
    add_file(&mut build, "libm/e_sqrtf.c");
    add_file(&mut build, "libm/e_hypotf.c");
    add_file(&mut build, "libm/e_fmodf.c");
    add_file(&mut build, "libm/w_powf.c");
    add_file(&mut build, "libm/w_hypotf.c");
    add_file(&mut build, "libm/w_fmodf.c");

    build.compile("m");
}