【发布时间】：2021-10-22 08:32:35
【问题描述】：
昨晚我将系统更新到 11.5.2，但发现 clang 不再工作，尤其是对于我需要从命令行编译的项目。
这是我收到的输出
(base) kd@kd-MacBook-Pro ~ % clang --version
objc[3677]: Class AMSupportURLConnectionDelegate is implemented in both /usr/lib/libauthinstall.dylib (0x20082bad8) and /System/Library/PrivateFrameworks/MobileDevice.framework/Versions/A/MobileDevice (0x1233e42b8). One of the two will be used. Which one is undefined.
objc[3677]: Class AMSupportURLSession is implemented in both /usr/lib/libauthinstall.dylib (0x20082bb28) and /System/Library/PrivateFrameworks/MobileDevice.framework/Versions/A/MobileDevice (0x1233e4308). One of the two will be used. Which one is undefined.
xcodebuild: error: SDK "/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk" cannot be located.
clang: error: sh -c '/Applications/Xcode.app/Contents/Developer/usr/bin/xcodebuild -sdk /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk -find clang 2> /dev/null' failed with exit code 16384: (null) (errno=Invalid argument)
xcode-select: Failed to locate 'clang', requesting installation of command line developer tools.
(base) kd@kd-MacBook-Pro ~ % ls /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk
Entitlements.plist SDKSettings.json SDKSettings.plist System usr
(base) kd@kd-MacBook-Pro ~ %
您可以看到该目录确实存在，新的是 AMSupportURLConnectionDelegate 和 AMSupportURLSession 已弹出，/usr/lib 听起来是正确的位置，但它所引用的 Mobile 目录超出了我的范围。
我的疑惑是那个Mobile框架？我不知道。 如果我允许安装 Clang，它会立即返回提供此错误。如果我什至重新启动终端甚至计算机，它仍然会出现此错误。
我该如何解决这个问题，所以找到了 clang，不再要求我安装它并提供这个讨厌的错误。
【问题讨论】：