rust-embedded Discovery `05-led-roulette` 構建失敗

Question

背景

我正在按照本指南在相應的 repo中構建項目。 我成功編譯、運行並驗證了項目 03 。

問題

但是，按照構建項目 05 的說明會產生“錯誤 [E0463]：找不到core板條箱”：

$ cargo build --features v2 --target thumbv7em-none-eabihf
info: syncing channel updates for 'nightly-2021-08-18-aarch64-apple-darwin'
info: latest update on 2021-08-18, rust version 1.56.0-nightly (30a0a9b69 2021-08-17)
info: downloading component 'cargo'
info: downloading component 'clippy'
info: downloading component 'rust-src'
info: downloading component 'rust-std'
info: downloading component 'rust-std' for 'riscv32imac-unknown-none-elf'
info: downloading component 'rust-std' for 'riscv32imc-unknown-none-elf'
info: downloading component 'rust-std' for 'thumbv6m-none-eabi'
info: downloading component 'rust-std' for 'thumbv7em-none-eabi'
info: downloading component 'rustc'
info: downloading component 'rustfmt'
info: installing component 'cargo'
info: installing component 'clippy'
info: installing component 'rust-src'
info: installing component 'rust-std'
info: installing component 'rust-std' for 'riscv32imac-unknown-none-elf'
info: installing component 'rust-std' for 'riscv32imc-unknown-none-elf'
info: installing component 'rust-std' for 'thumbv6m-none-eabi'
info: installing component 'rust-std' for 'thumbv7em-none-eabi'
info: installing component 'rustc'
info: installing component 'rustfmt'
info: syncing channel updates for 'stable-aarch64-apple-darwin'
info: latest update on 2022-01-20, rust version 1.58.1 (db9d1b20b 2022-01-20)
info: downloading component 'rust-src'
info: installing component 'rust-src'
   Compiling critical-section v0.2.5
error[E0463]: can't find crate for `core`
  |
  = note: the `thumbv7em-none-eabihf` target may not be installed
  = help: consider downloading the target with `rustup target add thumbv7em-none-eabihf`
  = help: consider building the standard library from source with `cargo build -Zbuild-std`

For more information about this error, try `rustc --explain E0463`.
error: could not compile `critical-section` due to previous error

這似乎是一個意外錯誤，因為它表明我缺少thumbv7em-none-eabihf目標工具鏈，但如果沒有安裝此工具鏈，項目 03 將無法正確編譯。

問題

我可以修復我的系統以正確構建項目 05 嗎？ 還是項目有bug？

相關系統數據：

如果有人想了解更多信息，請在評論中 lmk，我可以用我的機器的更多輸出更新此部分。

$ rustup component list --installed
cargo-aarch64-apple-darwin
clippy-aarch64-apple-darwin
rust-src
rust-std-aarch64-apple-darwin
rust-std-thumbv7em-none-eabihf
rustc-aarch64-apple-darwin
rustfmt-aarch64-apple-darwin

$ rustup show
Default host: aarch64-apple-darwin
rustup home:  /Users/___/.rustup

installed toolchains
--------------------

stable-aarch64-apple-darwin (default)
nightly-2021-08-18-aarch64-apple-darwin

installed targets for active toolchain
--------------------------------------

aarch64-apple-darwin
thumbv7em-none-eabihf

active toolchain
----------------

stable-aarch64-apple-darwin (default)
rustc 1.58.1 (db9d1b20b 2022-01-20)

Answer 1

原來我的 rust 工具鏈壞了； 我最初用 nix 安裝了所有東西，但是用 rustup 安裝（即 cargo）替換了一些 nix 安裝解決了問題。