linkcell 0.3.11

Periodic linked-cell cutoff pairs and k-nearest neighbour search
Documentation 
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fn main() {
    println!("cargo:rerun-if-changed=build.rs");
    let (major, minor) = rustc_version();
    // `unexpected_cfgs` arrived in 1.80. AVX-512 intrinsics arrived in 1.89.
    if major > 1 || minor >= 80 {
        println!("cargo:rustc-check-cfg=cfg(linkcell_avx512)");
    }
    if major > 1 || minor >= 89 {
        println!("cargo:rustc-cfg=linkcell_avx512");
    }
}

fn rustc_version() -> (u32, u32) {
    let rustc = std::env::var("RUSTC").unwrap_or_else(|_| "rustc".to_string());
    let out = std::process::Command::new(rustc)
        .arg("-vV")
        .output()
        .expect("rustc -vV");
    let text = String::from_utf8_lossy(&out.stdout);
    for line in text.lines() {
        if let Some(rest) = line.strip_prefix("release: ") {
            let ver = rest.split('-').next().unwrap_or(rest);
            let mut parts = ver.split('.');
            let major = parts.next().unwrap_or("1").parse().unwrap_or(1);
            let minor = parts.next().unwrap_or("70").parse().unwrap_or(70);
            return (major, minor);
        }
    }
    (1, 70)
}