错误[E0463]：找不到“core”的包注意：可能未安装“thumbv7m-none-eabi”目标

Question

我试图让 bluepill（arm STM32）上的 LED 闪烁并按照本教程中的说明进行操作，但是当我尝试编译代码时遇到此错误。我用的是ubuntu。

我刚刚安装了 Rust / Cargo，如教程中所示。我安装了stlink，我对 Rust、Cargo 或 Bluepil 没有经验。

$ cargo build --release:

        error[E0463]: can't find crate for `core`
      |
      = note: the `thumbv7m-none-eabi` target may not be installed

它依赖于 ./cargo/config 文件吗？

$ rustup show
Default host: x86_64-unknown-linux-gnu
rustup home:  /home/marco/snap/rustup/common/rustup

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

stable-x86_64-unknown-linux-gnu (default)
nightly-x86_64-unknown-linux-gnu

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

thumbv7m-none-eabi
x86_64-unknown-linux-gnu

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

stable-x86_64-unknown-linux-gnu (default)
rustc 1.46.0 (04488afe3 2020-08-24)

$ rustup target add thumbv7em-none-eabi
info: downloading component 'rust-std' for 'thumbv7em-none-eabi'
info: installing component 'rust-std' for 'thumbv7em-none-eabi'
info: Defaulting to 500.0 MiB unpack ram

$ cargo build --release
   Compiling semver-parser v0.7.0
   Compiling typenum v1.12.0
   Compiling proc-macro2 v1.0.19
   Compiling unicode-xid v0.2.1
   Compiling syn v1.0.39
   Compiling stable_deref_trait v1.2.0
error[E0463]: can't find crate for `core`
  |
  = note: the `thumbv7m-none-eabi` target may not be installed

它取决于“Cargo.toml”文件中的名称吗？我究竟做错了什么？

Answer 1

export PATH="$HOME/.cargo/bin:$PATH"