背景：

用迁移助理从x86迁移到M3之后，gcc返回错误：

gcc -v

xcrun: error: unable to load libxcrun (dlopen(/Library/Developer/CommandLineTools/usr/lib/libxcrun.dylib, 0x0005): tried: '/Library/Developer/CommandLineTools/usr/lib/libxcrun.dylib' (mach-o file, but is an incompatible architecture (have 'x86_64', need '')), '/System/Volumes/Preboot/Cryptexes/OS/Library/Developer/CommandLineTools/usr/lib/libxcrun.dylib' (no such file), '/Library/Developer/CommandLineTools/usr/lib/libxcrun.dylib' (mach-o file, but is an incompatible architecture (have 'x86_64', need ''))).

看错误就是原来x86下面的模块不是兼容模式，不适用于arm架构

解决方法来自于网络，测试有效：

sudo rm -rf /Library/Developer/CommandLineTools

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"