Mac Homebrew 损坏修复及用brew 安装gradle

最近mac命令行窗口使用brew总是报各种错误。
比如

xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun
Error: An exception occurred within a child process:
  CompilerSelectionError: gradle cannot be built with any available compilers.
Install GNU's GCC:
  brew install gcc

又比如

xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun
Error: The following formula
  gcc
cannot be installed as binary package and must be built from source.
Install the Command Line Tools:
  xcode-select --install

到目录底下一看，啥时候没了

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那么去官网https://developer.apple.com/download/more/下载，刚开始下载了个
Command_Line_Tools_for_Xcode_12.5.dmg 结果悲剧了 版本不兼容，你们懂了不敢随便升级mac系统，毕竟很多软件是破解的。

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官网也没说兼容的mac系统，那就选个发布日期比自己笔记本生产日期相近的版本吧 我是2020的机子，就选了个2020 1月份发布的。我选了Command_Line_Tools_for_Xcode_11.3.1.dmg，运气不错，一把通过

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输入命令检查下能否用了，ok了

brew info
19 kegs, 17,349 files, 278.9MB

装个gradle试试,光下载就好几分钟

brew install gradle   

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