title: File format not recognized when run objdump in binutils
body: <p>There is a .a lib in iOS project. I want to see the methods name in it, so I installed binutils on Mac. But when I run objdump [-h] xxx.a. It says:</p>
  
  <p>"File format not recognized".</p>
  
  <p>So, what format does objdump supports? And how can I see the methods in that .a lib without using objdump?</p>