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Fix cargo run tidy #94806

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Merged
merged 1 commit into from
Mar 31, 2022
Merged

Fix cargo run tidy #94806

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8 changes: 7 additions & 1 deletion src/bootstrap/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -117,6 +117,7 @@ use std::os::unix::fs::symlink as symlink_file;
use std::os::windows::fs::symlink_file;

use filetime::FileTime;
use once_cell::sync::OnceCell;

use crate::builder::Kind;
use crate::config::{LlvmLibunwind, TargetSelection};
Expand Down Expand Up @@ -892,7 +893,12 @@ impl Build {

/// Returns the sysroot of the snapshot compiler.
fn rustc_snapshot_sysroot(&self) -> &Path {
self.initial_rustc.parent().unwrap().parent().unwrap()
static SYSROOT_CACHE: OnceCell<PathBuf> = once_cell::sync::OnceCell::new();
SYSROOT_CACHE.get_or_init(|| {
let mut rustc = Command::new(&self.initial_rustc);
rustc.args(&["--print", "sysroot"]);
output(&mut rustc).trim().into()
})
}

/// Runs a command, printing out nice contextual information if it fails.
Expand Down