use std::{env, process::Command, str};
fn main() {
let compiler = match rustc_version() {
Some(compiler) => compiler,
None => return,
};
if compiler.minor >= 64 {
println!("cargo:rustc-cfg=process_group");
}
}
struct Compiler {
minor: u32,
}
fn rustc_version() -> Option<Compiler> {
let rustc = env::var_os("RUSTC")?;
let output = Command::new(rustc).arg("--version").output().ok()?;
let version = str::from_utf8(&output.stdout).ok()?;
let mut pieces = version.split('.');
if pieces.next() != Some("rustc 1") {
return None;
}
let minor = pieces.next()?.parse().ok()?;
Some(Compiler { minor })
}