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|
#![allow(
clippy::enum_glob_use,
clippy::must_use_candidate,
clippy::single_match_else
)]
mod rustc;
use std::env;
use std::ffi::OsString;
use std::fs;
use std::path::Path;
use std::process::{self, Command};
fn main() {
println!("cargo:rerun-if-changed=build/build.rs");
let rustc = env::var_os("RUSTC").unwrap_or_else(|| OsString::from("rustc"));
let mut is_clippy_driver = false;
let version = loop {
let mut command = Command::new(&rustc);
if is_clippy_driver {
command.arg("--rustc");
}
command.arg("--version");
let output = match command.output() {
Ok(output) => output,
Err(e) => {
let rustc = rustc.to_string_lossy();
eprintln!("Error: failed to run `{} --version`: {}", rustc, e);
process::exit(1);
}
};
let string = match String::from_utf8(output.stdout) {
Ok(string) => string,
Err(e) => {
let rustc = rustc.to_string_lossy();
eprintln!(
"Error: failed to parse output of `{} --version`: {}",
rustc, e,
);
process::exit(1);
}
};
break match rustc::parse(&string) {
rustc::ParseResult::Success(version) => version,
rustc::ParseResult::OopsClippy if !is_clippy_driver => {
is_clippy_driver = true;
continue;
}
rustc::ParseResult::Unrecognized | rustc::ParseResult::OopsClippy => {
eprintln!(
"Error: unexpected output from `rustc --version`: {:?}\n\n\
Please file an issue in https://github.com/dtolnay/rustversion",
string
);
process::exit(1);
}
};
};
if version.minor < 38 {
// Prior to 1.38, a #[proc_macro] is not allowed to be named `cfg`.
println!("cargo:rustc-cfg=cfg_macro_not_allowed");
}
let version = format!("{:#?}\n", version);
let out_dir = env::var_os("OUT_DIR").expect("OUT_DIR not set");
let out_file = Path::new(&out_dir).join("version.expr");
fs::write(out_file, version).expect("failed to write version.expr");
}
|
