macOS Big Surでbrew upgradeが失敗した

雑記

brew upgrade したらこんなエラーが出た。

Error: Your CLT does not support macOS 11.
It is either outdated or was modified.
Please update your CLT or delete it if no updates are available.
Update them from Software Update in System Preferences or run:
  softwareupdate --all --install --force

If that doesn't show you an update run:
  sudo rm -rf /Library/Developer/CommandLineTools
  sudo xcode-select --install

Alternatively, manually download them from:
  https://developer.apple.com/download/more/.

Error: An exception occurred within a child process:
  SystemExit: exit

CLT が古いような感じだけど、Xcode は最新版をインストールしてある。

brew --config の結果を見てみる。

$ brew --config
HOMEBREW_VERSION: 2.6.0
ORIGIN: https://github.com/Homebrew/brew
HEAD: 1d5e354cc2ff048bd7161d95b3fa7f91dc9dd081
Last commit: 32 hours ago
Core tap ORIGIN: https://github.com/Homebrew/homebrew-core
Core tap HEAD: 119da4ff5bbe7de4d7a05cc19c1e5f6d437ce3ce
Core tap last commit: 3 hours ago
Core tap branch: master
HOMEBREW_PREFIX: /usr/local
HOMEBREW_CASK_OPTS: []
HOMEBREW_MAKE_JOBS: 12
Homebrew Ruby: 2.6.3 => /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/bin/ruby
CPU: dodeca-core 64-bit kabylake
Clang: 12.0 build 1200
Git: 2.24.3 => /Applications/Xcode.app/Contents/Developer/usr/bin/git
Curl: 7.64.1 => /usr/bin/curl
Java: 1.8.0_252
macOS: 11.0.1-x86_64
CLT: 1103.0.32.62
Xcode: 12.2

エラーに表示されている通りにしてみる。

$ sudo rm -rf /Library/Developer/CommandLineTools
$ sudo xcode-select --install

としてから brew --config する。

$ brew --config
HOMEBREW_VERSION: 2.6.0
ORIGIN: https://github.com/Homebrew/brew
HEAD: 1d5e354cc2ff048bd7161d95b3fa7f91dc9dd081
Last commit: 2 days ago
Core tap ORIGIN: https://github.com/Homebrew/homebrew-core
Core tap HEAD: 62a35f8fc9a2620483594f2b4d9779928e8be919
Core tap last commit: 34 minutes ago
Core tap branch: master
HOMEBREW_PREFIX: /usr/local
HOMEBREW_CASK_OPTS: []
HOMEBREW_MAKE_JOBS: 12
Homebrew Ruby: 2.6.3 => /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/bin/ruby
CPU: dodeca-core 64-bit kabylake
Clang: 12.0 build 1200
Git: 2.24.3 => /Applications/Xcode.app/Contents/Developer/usr/bin/git
Curl: 7.64.1 => /usr/bin/curl
Java: 1.8.0_252
macOS: 11.0.1-x86_64
CLT: 12.2.0.0.1.1604076827
Xcode: 12.2

CLT: 1103.0.32.62 ⇒ CLT: 12.2.0.0.1.1604076827 になった。

改めて brew upgrade してみると、今度はエラーが出ること無く成功した。