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Auto merge of #96803 - jyn514:faster-assemble, r=Mark-Simulacrum

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Make "Assemble stage1 compiler" orders of magnitude faster

This used to take upwards of 5 seconds for me locally. I found that the culprit was copying the downloaded LLVM shared object:
```
[22:28:03] Install "/home/jnelson/rust-lang/rust/build/x86_64-unknown-linux-gnu/ci-llvm/lib/libLLVM-14-rust-1.62.0-nightly.so" to "/home/jnelson/rust-lang/rust/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib/libLLVM-14-rust-1.62.0-nightly.so"
[22:28:09]   c Sysroot { compiler: Compiler { stage: 1, host: x86_64-unknown-linux-gnu(x86_64-unknown-linux-gnu) } }
```

It turned out that `install()` used full copies unconditionally. Change it to try using a hard-link before falling back to copying.
This commit is contained in:
bors 2022-05-10 03:11:05 +00:00
commit 87fd70c107
1 changed files with 3 additions and 9 deletions
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12
src/bootstrap/lib.rs
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@ -1497,20 +1497,14 @@ impl Build {
let dst = dstdir.join(src.file_name().unwrap());
self.verbose_than(1, &format!("Install {:?} to {:?}", src, dst));
t!(fs::create_dir_all(dstdir));
drop(fs::remove_file(&dst));
{
if !src.exists() {
panic!("Error: File \"{}\" not found!", src.display());
}
let metadata = t!(src.symlink_metadata());
if let Err(e) = fs::copy(&src, &dst) {
panic!("failed to copy `{}` to `{}`: {}", src.display(), dst.display(), e)
}
t!(fs::set_permissions(&dst, metadata.permissions()));
let atime = FileTime::from_last_access_time(&metadata);
let mtime = FileTime::from_last_modification_time(&metadata);
t!(filetime::set_file_times(&dst, atime, mtime));
self.copy(src, &dst);
}
// NOTE: when using hard-links, this will also update the permissions on the original file.
// We never use permissions that are more restrictive than the original, so this shouldn't cause any issues.
chmod(&dst, perms);
}