posts: Release of Rustup 1.23.0

posts/2020-11-27-Rustup-1.23.0.md

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+---
+layout: post
+title: "Announcing Rustup 1.23.0"
+author: The Rustup Working Group
+---
+
+The rustup working group is happy to announce the release of rustup version 1.23.0. [Rustup][install] is the recommended tool to install [Rust][rust], a programming language that is empowering everyone to build reliable and efficient software.
+
+If you have a previous version of rustup installed, getting rustup 1.23.0 is as easy as closing your IDE and running:
+
+```
+rustup self update
+```
+
+Rustup will also automatically update itself at the end of a normal toolchain update:
+
+```
+rustup update
+```
+
+If you don't have it already, you can [get rustup][install] from the appropriate page on our website.
+
+[rust]: https://www.rust-lang.org
+[install]: https://rustup.rs
+
+## What's new in rustup 1.23.0
+
+### Support for Apple M1 devices
+
+Rustup is now natively available for the new Apple M1 devices, allowing you to install it on the new Macs the same way you'd install it on other platforms!
+
+Note that at the time of writing this blog post the `aarch64-apple-darwin` compiler is at [Tier 2 target][tiers]: precompiled binaries are available starting from Rust 1.49 (currently in the beta channel), but no automated tests are executed on them.
+
+You can follow [issue #73908][rust/73908] to track the work needed to bring Apple Silicon support to Tier 1.
+
+[tiers]: https://doc.rust-lang.org/rustc/platform-support.html#tier-2
+[rust/73908]: https://github.com/rust-lang/rust/issues/73908
+
+### Support for installing minor releases
+
+The Rust team releases a new version every six weeks, bringing new features and bugfixes on a regular basis. Sometimes a regression slips into a stable release, and the team releases a "point release" containing fixes for that regression. For example, [1.45.1] and [1.45.2] were point releases of [Rust 1.45.0][1.45.0], while [1.46.0] and [1.47.0] both had no point releases.
+
+With rustup 1.22.1 or earlier if you wanted to use a stable release you were able to either install `stable` (which automatically updates to the latest one) or a specific version number, such as `1.48.0`, `1.45.0` or `1.45.2`. Starting from this release of rustup (1.23.0) you can also install a minor version without specifying the patch version, like `1.48` or `1.45`. These "virtual" releases will always point to the latest patch release of that cycle, so `rustup toolchain install 1.45` will get you a [1.45.2] toolchain.
+
+[1.45.0]: https://blog.rust-lang.org/2020/07/16/Rust-1.45.0.html
+[1.45.1]: https://blog.rust-lang.org/2020/07/30/Rust-1.45.1.html
+[1.45.2]: https://blog.rust-lang.org/2020/08/03/Rust-1.45.2.html
+[1.46.0]: https://blog.rust-lang.org/2020/08/27/Rust-1.46.0.html
+[1.47.0]: https://blog.rust-lang.org/2020/10/08/Rust-1.47.html
+
+### New format for `rust-toolchain`
+
+The rustup 1.5.0 release introduced the `rust-toolchain` file, allowing you to choose the default toolchain for a project. When the file is present rustup ensures the toolchain specified in it is installed on the local system, and it will use that version when calling `rustc` or `cargo`:
+
+```
+$ cat rust-toolchain
+nightly-2020-07-10
+$ cargo --version
+cargo 1.46.0-nightly (fede83ccf 2020-07-02)
+```
+
+The file works great for projects wanting to use a specific nightly version, but didn't allow to add extra components (like `clippy`) or compilation targets. Rustup 1.23.0 introduces a new, optional TOML syntax for the file, with support for specifying components and targets:
+
+```toml
+[toolchain]
+channel = "nightly-2020-07-10"
+components = ["rustfmt", "clippy"]
+targets = ["wasm32-unknown-unknown"]
+```
+
+The new syntax doesn't replace the old one, and both will continue to work. You can learn more about overriding the default toolchain in the ["Overrides" chapter of the rustup book][overrides].
+
+[overrides]: https://rust-lang.github.io/rustup/overrides.html#the-toolchain-file
+
+### Other changes
+
+There are more changes in rustup 1.23.0: check them out in the [changelog]! Rustup's documentation is also available in [the rustup book][book] starting from this release.
+
+[changelog]: https://github.com/rust-lang/rustup/blob/stable/CHANGELOG.md
+[book]: https://rust-lang.github.io/rustup/
+
+## Thanks
+
+Thanks to all the contributors who made rustup 1.23.0 possible!
+
+- Aaron Loucks
+- Aleksey Kladov
+- Aurelia Dolo
+- Camelid
+- Chansuke
+- Carol (Nichols || Goulding)
+- Daniel Silverstone
+- Dany Marcoux
+- Eduard Miller
+- Eduardo Broto
+- Eric Huss
+- Francesco Zardi
+- FR Bimo
+- Ivan Nejgebauer
+- Ivan Tham
+- Jake Goulding
+- Jens Reidel
+- Joshua M. Clulow
+- Joshua Nelson
+- Jubilee Young
+- Leigh McCulloch
+- Lzu Tao
+- Matthias Krüger
+- Matt Kraai
+- Matt McKay
+- Nick Ashley
+- Pascal Hertleif
+- Paul Lange
+- Pietro Albini
+- Robert Collins
+- Stephen Muss
+- Tom Eccles