在 macOS 遇到 xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun 問題時如何解決
每次當 macOS 升級時多多少少在開發或是使用application 都會遇到下面的錯誤訊息 xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun
這邊紀錄一下處理方式避免之後忘記：
這邊以 Rider 搭配 .NET6 時遇到
Failed to sign apphost with error code 0: xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun
/Users/ct.tsai/Desktop/Repo/gitlab/asp-dotnet-core-6-spa-react/src/AspNeCore6WithReactSpa/Application.Web/obj/Debug/net6.0/apphost: the codesign_allocate helper tool cannot be found or used
at (536:5)
直接於終端機執行更新 xcode 延伸套件：
xcode-select --install
安裝完成後接著回去重啟 IDE(以我這邊為例是 Rider, 即可成功編譯)
