首先，mac系统下的文件格式是mach-o，并不支持objdump和readelf；
退而求其次，使用brew update && brew install binutils，然后用greadelf和gobjdump；
注意，使用使用brew update && brew install binutils会有如下提示：
binutils is keg-only, which means it was not symlinked into /usr/local,
because because Apple provides the same tools and binutils is poorly supported on macOS.
If you need to have binutils first in your PATH run:
echo 'export PATH="/usr/local/opt/binutils/bin:$PATH"' >> ~/.bash_profile
For compilers to find binutils you may need to set:
export LDFLAGS="-L/usr/local/opt/binutils/lib"
export CPPFLAGS="-I/usr/local/opt/binutils/include"
