Xcode完全卸載及升級

個人macOS前一陣升級到了macOS Mojave，今天想折騰一下macOS下的ESP8266編譯環境，結果提示：Your Xcode (9.4.1) is too outdated.xcode /Users/simonliu >brew install gnu-sed --with-default-names Error: Your Xcode (9.4.1) is too outdated.

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