Closes#51339
This should address issues with too new libstdc++.so on older/more
conservative distros such as RHEL9.
Release Notes:
- Relaxed requirement for libstdc++.so available on Linux distros.
I noticed we had some typos that were getting through CI, but it looks
like the new version of `typos` catches them. So I updated it and fixed
them.
Release Notes:
- N/A
# Summary
Today, Zed uses Mold on Linux, but Wild can be significantly faster.
On my machine, Wild is 14% faster at a whole-tree clean build, 20%
faster on an incremental build with a minimal change, and makes no
measurable effect on runtime performance of tests.
However, Wild's page says it's not yet ready for production, so it seems
to early to switch for production and CI builds.
This PR keeps using Mold in CI and lets developers choose in their own
config what linker to use. (The downside of this is that after landing
this change, developers will have to do some local config or it will
fall back to the default linker which may be slower.)
[Wild 0.6 is out, and their announcement has some
benchmarks](https://davidlattimore.github.io/posts/2025/09/23/wild-update-0.6.0.html).
cc @davidlattimore from Wild, just fyi
# Tasks
- [x] Measure Wild build, incremental build, and runtime performance in
different scenarios
- [x] Remove the Linux linker config from `.cargo/config.toml` in the
tree
- [x] Test rope benchmarks etc
- [x] Set the linker to Mold in CI
- [x] Add instructions to use Wild or Mold into `linux.md`
- [x] Add a script to download Wild
- [x] Measure binary size
- [x] Recommend Wild from `scripts/linux`
# Benchmarks
| | wild 0.6 (rust 1.89) | mold 2.37.1 (1.89) | lld (rust 1.90) | wild
advantage |
| -- | -- | -- | -- | -- |
| clean workspace build | 176s | 184s | 182s | 5% faster than mold |
| nextest run workspace after build | 137s | 142s | 137s | in the noise?
|
| incremental rebuild | 3.9s | 5.0s | 6.6s | 22% faster than mold |
I didn't observe any apparent significant change in runtime performance
or binary size, or in the in-tree microbenchmarks.
Release Notes:
- N/A
---------
Co-authored-by: Mateusz Mikuła <oss@mateuszmikula.dev>
While working on PR #23117, I noticed that the Windows runner in our CI
setup doesn't seem to respect the settings defined in
`.cargo/config.toml`. With @SomeoneToIgnore ’s help, Kirill and I
realized this issue isn’t limited to the Windows runner—all of our
runners disregard the configurations in `.cargo/config.toml`.
Later, @osiewicz suggested an excellent workaround. I conducted some
tests on PR #23117 and found that the solution works as intended.
Personally, I prefer using environment variables for global
configuration. However, according to the documentation
[here](https://doc.rust-lang.org/cargo/reference/config.html), it seems
that environment variables always override the settings in
`.cargo/config.toml`.
Release Notes:
- N/A
This PR sets up a `cargo xtask clippy` command for running `cargo
clippy` with our defined set of options.
The intent is to make this easier to manage as we start enabling more
Clippy rules.
Release Notes:
- N/A
