The Toolchain


Rustup installs and manages Rust compiler toolchains

It is not the Rust compiler!

Important commands

# Installation of a toolchain (here: the stable release channel)
$ rustup install stable

# Selection of a default toolchain
$ rustup default stable

# Display documentation in browser
$ rustup doc [--std]

# Override the default toolchain in your directory
$ rustup override set stable

# List supported targets
$ rustup target list

# Add and install a target to the toolchain (here: to cross-compile for an ARMv6-M target)
$ rustup target add thumbv6m-none-eabi

For up-to-date information, please see Rust Component History

Contents of the toolchain

  • rustc, rust-docs, rust-std, rustfmt, rust-(lldb|gdb)*

  • cargo, cargo-fmt

  • clippy

  • libcore/libstd

* The debugger installed is platform dependent.


$ rustc --help

The Rust compiler builds and links Rust code.

The quintessential beginning

fn main() {
    println!("Hello, World!");

The quintessential output

$ rustc
$ ./hello_world
Hello, World!


$ cargo --help

Cargo contd.

Cargo is Rusts build and package management tool.

Cargo is installed along with rustc, but is not tightly coupled to a rustc version.

Once more with Cargo

$ cargo new hello-world
$ cd hello-world
$ cat src/
fn main() {
    println!("Hello, world!");
$ cargo build
   Compiling hello-world v0.1.0 (file:///Users/skade/Code/rust/scratchpad/hello-world)
    Finished debug [unoptimized + debuginfo] target(s) in 0.35 secs
$ cargo run
    Finished debug [unoptimized + debuginfo] target(s) in 0.0 secs
     Running `target/debug/hello-world`
Hello, world!

A Little Look Around

  • What is in Cargo.toml?

  • What is in Cargo.lock?

For details, check the Cargo Manifest docs.



rust-analyzer: Things to know

Add some tooling

$ rustup component add rustfmt
$ rustup component add clippy
$ cargo tree