| // Copyright 2023 Google LLC |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // https://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| // It would be nice to use the rustversion crate here instead, |
| // but that doesn't work with inner attributes. |
| fn main() { |
| if let Some(ver) = rustc_version() { |
| if ver.contains("nightly") { |
| println!("cargo:rustc-cfg=nightly") |
| } |
| } |
| } |
| |
| fn rustc_version() -> Option<String> { |
| let rustc = std::env::var_os("RUSTC")?; |
| let output = std::process::Command::new(rustc) |
| .arg("--version") |
| .output() |
| .ok()?; |
| let version = String::from_utf8(output.stdout).ok()?; |
| Some(version) |
| } |