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use std::process::Command;
use std::str;
fn main() {
// Temporary check to see if the rustc version >= 1.81 in which case the
// `Error` trait is always available. This is temporary because in the
// future the MSRV of this crate will be beyond 1.81 in which case this
// build script can be deleted.
let minor = rustc_minor_version().unwrap_or(0);
if minor >= 81 {
println!("cargo:rustc-cfg=core_error");
}
if minor >= 80 {
println!("cargo:rustc-check-cfg=cfg(core_error)");
}
}
fn rustc_minor_version() -> Option<u32> {
let rustc = std::env::var("RUSTC").unwrap();
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;
}
pieces.next()?.parse().ok()
}
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