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Try to fix unique file names on Windows

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This commit is contained in:
Jonas Schievink 2021-06-09 18:02:04 +02:00
parent 05b3a4bc93
commit d236fc6abe
1 changed files with 7 additions and 4 deletions
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11
crates/proc_macro_srv/src/dylib.rs
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@ -188,7 +188,9 @@ impl Expander {
/// Copy the dylib to temp directory to prevent locking in Windows
#[cfg(windows)]
fn ensure_file_with_lock_free_access(path: &Path) -> io::Result<PathBuf> {
use std::{ffi::OsString, time::SystemTime};
use std::collections::hash_map::RandomState;
use std::ffi::OsString;
use std::hash::{BuildHasher, Hasher};
let mut to = std::env::temp_dir();
@ -199,10 +201,11 @@ fn ensure_file_with_lock_free_access(path: &Path) -> io::Result<PathBuf> {
)
})?;
// generate a time deps unique number
let t = SystemTime::now().duration_since(std::time::UNIX_EPOCH).expect("Time went backwards");
// Generate a unique number by abusing `HashMap`'s hasher.
// Maybe this will also "inspire" a libs team member to finally put `rand` in libstd.
let t = RandomState::new().build_hasher().finish();
let mut unique_name = OsString::from(t.as_millis().to_string());
let mut unique_name = OsString::from(t.to_string());
unique_name.push(file_name);
to.push(unique_name);