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Detect compiler minor version in build script

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This commit is contained in:
David Tolnay 2019-10-13 09:03:20 -07:00
parent f432c46269
commit d782e42503
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GPG Key ID: F9BA143B95FF6D82
1 changed files with 14 additions and 18 deletions
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32
build.rs
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@ -1,6 +1,6 @@
use std::env;
use std::process::Command;
use std::str;
use std::str::{self, FromStr};
fn main() {
let compiler = match rustc_version() {
@ -8,32 +8,28 @@ fn main() {
None => return,
};
if compiler.nightly {
if compiler.minor >= 40 && compiler.nightly {
println!("cargo:rustc-cfg=backtrace");
}
}
struct Compiler {
minor: u32,
nightly: bool,
}
fn rustc_version() -> Option<Compiler> {
let rustc = match env::var_os("RUSTC") {
Some(rustc) => rustc,
None => return None,
};
let rustc = env::var_os("RUSTC")?;
let output = Command::new(rustc).arg("--version").output().ok()?;
let version = str::from_utf8(&output.stdout).ok()?;
let output = match Command::new(rustc).arg("--version").output() {
Ok(output) => output,
Err(_) => return None,
};
let mut pieces = version.split('.');
if pieces.next() != Some("rustc 1") {
return None;
}
let version = match str::from_utf8(&output.stdout) {
Ok(version) => version,
Err(_) => return None,
};
Some(Compiler {
nightly: version.contains("nightly") || version.contains("dev"),
})
let next = pieces.next()?;
let minor = u32::from_str(next).ok()?;
let nightly = version.contains("nightly") || version.contains("dev");
Some(Compiler { minor, nightly })
}