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|
use std::env;
use std::ffi::OsString;
use std::io::{self, Write};
use std::process::Command;
fn main() {
let version = match Version::read() {
Ok(version) => version,
Err(err) => {
writeln!(
&mut io::stderr(),
"failed to parse `rustc --version`: {}",
err
).unwrap();
return;
}
};
enable_i128(version);
}
fn enable_i128(version: Version) {
if version < (Version { major: 1, minor: 26, patch: 0 }) {
return;
}
println!("cargo:rustc-cfg=byteorder_i128");
}
#[derive(Clone, Copy, Debug, Eq, PartialEq, PartialOrd, Ord)]
struct Version {
major: u32,
minor: u32,
patch: u32,
}
impl Version {
fn read() -> Result<Version, String> {
let rustc = env::var_os("RUSTC").unwrap_or(OsString::from("rustc"));
let output = Command::new(&rustc)
.arg("--version")
.output()
.unwrap()
.stdout;
Version::parse(&String::from_utf8(output).unwrap())
}
fn parse(mut s: &str) -> Result<Version, String> {
if !s.starts_with("rustc ") {
return Err(format!("unrecognized version string: {}", s));
}
s = &s["rustc ".len()..];
let parts: Vec<&str> = s.split(".").collect();
if parts.len() < 3 {
return Err(format!("not enough version parts: {:?}", parts));
}
let mut num = String::new();
for c in parts[0].chars() {
if !c.is_digit(10) {
break;
}
num.push(c);
}
let major = try!(num.parse::<u32>().map_err(|e| e.to_string()));
num.clear();
for c in parts[1].chars() {
if !c.is_digit(10) {
break;
}
num.push(c);
}
let minor = try!(num.parse::<u32>().map_err(|e| e.to_string()));
num.clear();
for c in parts[2].chars() {
if !c.is_digit(10) {
break;
}
num.push(c);
}
let patch = try!(num.parse::<u32>().map_err(|e| e.to_string()));
Ok(Version { major: major, minor: minor, patch: patch })
}
}
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