如何仅使用 cargo 或 rustc 为自定义目标编译 Rust 核心板条箱？

Question

I'm writing code for a bare-metal x86 target and I need to cross-compile the core crate. I want a solution that only uses cargo or rustc.

I currently use xcargo to compile a dummy no_std crate and copy the sysroot folder to my project.

Answer 1

You can use the unstable build-std feature of Cargo:

cargo build -Z build-std=core --target my-custom-target.json

The argument can be:

• core
• std
• alloc
• proc_macro

Pass no argument for all of them.