FreeBSD 開發者正在考慮允許在 FreeBSD 基礎系統中使用 Rust 編程語言的好處和成本。




郵件寫道，在 FreeBSD 基礎系統使用 Rust 的主要缺點是構建時間加倍。這是因為需要編譯基于 LLVM 的 Rustc 編譯器和 Rust 的所有附加功能，這些操作使得基礎系統的構建時間大約是當前的兩倍。



如果 FreeBSD 基礎系統采用了 Rust，開發者可以重新 Rust 重寫許多組件 —— 而不是使用 C++，例如 ZFS 守護進程 (zfsd)、重寫 devd、WiFi 用戶空間代碼也可以受益于用 Rust 編寫，等等。列舉部分如下：

* ctl-exporter (I started this, but discovered that the CTL stats API is
unstable, so it can't live in ports. Instead, I had to do it in C).

https://github.com/freebsd/freebsd-src/commit/1a7f22d9c211f504f6c48a86401469181a67ec34

* fusefs tests. Absolutely impossible to do in C. I considered Rust, but went

with C++ so they could live in base. They are too closely coupled to

fusefs(5) to live out-of-tree.

https://github.com/freebsd/freebsd-src/tree/main/tests/sys/fs/fusefs

* devd. Currently C++, but imp suggested a rewrite.

https://github.com/freebsd/freebsd-src/tree/main/sbin/devd

* zfsd. Currently C++, but I've long pondered a rewrite. Using Rust would

make it more testable.

https://github.com/freebsd/freebsd-src/tree/main/cddl/usr.sbin/zfsd

* nscd. Currently C, but confusing and with no test coverage. I've

contemplated a rewrite myself, but I don't want to do it in C.

https://github.com/freebsd/freebsd-src/tree/main/usr.sbin/nscd

* The userland portion of the 802.11ac and Lightning stacks. scottl suggested

that these were good candidates for Rust.

* freebsd-kpi-r14-0 . https://crates.io/crates/freebsd-kpi-r14-0

審核編輯：劉清