Rustup v1.21.0

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Rustup v1.21.0 Release Notes

• 🚀 In release 1.20.x profiles could incorrectly ascribe host-independent components to the host architecture, resulting in surprising behaviour with rust-src. We have corrected this and added mitigations which should 🚀 mean that as of this release, such incorrect ascriptions are supported and also ⚡️ automatically corrected on toolchain update.

  Due to the large number of confusions around the complete profile, we have ⚠ introduced a warning if you use it. It's really only meant for developers of Rust, or those exploring particular issues in nightly.

  There are also a large number of other changes, the highlights of which are below. 🚀 Thanks to everyone who helped work on this release. Even if your changes are not listed below, they are still greatly appreciated.

  🔄 Changed

  • ⚡️ Download directory is cleaned up after successful full update.
  • Bad .partial downloads will be cleaned up for you
  • Force installation of toolchain if install is automatic
  • Switch to darker colours to improve terminal readability
  • 0️⃣ Attempt to be less surprising wrt. default-host during installation
  • rustup toolchain list --verbose now correctly shows the paths
  • ⚡️ Fallback environment for non-cargo toolchains updated to match rustc
  • Made human-readable units slightly more comprehensible
  • Improved detection of armhf userland on aarch64 kernels
  • Improved error message when rustc is detected on installation

  ➕ Added

  • 👍 Added --profile support to rustup toolchain install
  • 👍 Added +toolchain support to rustup itself to match proxy functionality
  • Added ability to rustup component add component-architecture
  • 📄 Added clear report when rustup doc is run without rust-docs available
  • 👍 Added keyword:, primitive:, and macro: prefix support to rustup doc FOO
  • Added retry logic so that rustup will try and repeat interrupted downloads
  • ⬇️ Added --allow-downgrade support to rustup toolchain install
  • ⬆️ Added display of previous version when upgrading channels
  • 👍 Added support for local non-channel toolchains in rust-toolchain file

  Thanks

  • Roman Frołow
  • Jean Simard
  • Lzu Tao
  • Benjamin Chen
  • Daniel Silverstone
  • Jon Hoo
  • Carlo Abelli
  • Filip Demski
  • Chris Tomlinson
  • Kane Green
  • Ralf Jung
  • Yves Dorfsman
  • Rudolf B
  • Pietro Albini
  • Takayuki Nakata
  • Justus K
  • Gilbert Röhrbein
  • Friedel Ziegelmayer
  • Robbie Clarken
  • Tetsuharu OHZEKI

  🚀 [1.21.0]: https://github.com/rust-lang/rustup/releases/tag/1.21.0

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