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use std::env;
use std::process::Command;
use std::str;
fn main() {
println!("cargo:rerun-if-changed=build.rs");
let rustc = match rustc_minor_version() {
Some(rustc) => rustc,
None => return,
};
if rustc >= 80 {
println!("cargo:rustc-check-cfg=cfg(exhaustive)");
println!("cargo:rustc-check-cfg=cfg(no_unsafe_extern_blocks)");
}
if rustc < 82 {
// https://blog.rust-lang.org/2024/10/17/Rust-1.82.0.html#safe-items-with-unsafe-extern
println!("cargo:rustc-cfg=no_unsafe_extern_blocks");
}
}
fn rustc_minor_version() -> Option<u32> {
let rustc = env::var_os("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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