clion mac版升级后不能编译，显示missing xcrun等问题解决

该问题可能会在升级mac系统或者clion客户端后发生，发生error日志通常以下，大多显示missing xcrunxcode 问题描述：ui Error:The C compiler "/usr/bin/cc" is not able to compile a simple test program. It fails with the following output: Change Di

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