title: What is the first column of nm output?
body: <p>Thats my code:</p>
  
  <pre><code>int const const_global_init = 2;
  int const const_global;
  int global_init = 4;
  int global;
  
  static int static_global_init = 3;
  static int static_global;
  
  static int static_function(){
      return 2;
  }
  
  double function_with_param(int a){
      static int static_local_init = 3;
      static int static_local;
  
      return 2.2;
  }
  
  int main(){
  }
  </code></pre>
  
  <p>I generate <code>main.o</code> and i try to understood <code>nm</code> output. After i use <code>nm main.o --printfile-name -a</code> i get this output:</p>
  
  <pre><code>main.o:0000000000000000 b .bss
  main.o:0000000000000000 n .comment
  main.o:0000000000000004 C const_global
  main.o:0000000000000000 R const_global_init
  main.o:0000000000000000 d .data
  main.o:0000000000000000 r .eh_frame
  main.o:000000000000000b T function_with_param
  main.o:0000000000000004 C global
  main.o:0000000000000000 D global_init
  main.o:0000000000000027 T main
  main.o:0000000000000000 a main.c
  main.o:0000000000000000 n .note.GNU-stack
  main.o:0000000000000000 r .rodata
  main.o:0000000000000000 t static_function
  main.o:0000000000000000 b static_global
  main.o:0000000000000004 d static_global_init
  main.o:0000000000000004 b static_local.1733
  main.o:0000000000000008 d static_local_init.1732
  main.o:0000000000000000 t .text
  </code></pre>
  
  <p>I understood 2nd and 3rd column but, i really dont know what is in the first column, whether it is the address or size? I know somethink about <code>.bbs</code>, <code>.comment</code>, <code>.data</code> and <code>.text</code> segments but what is it <code>.eh_frame</code>, <code>.note.GNU-stack</code> and <code>.rodata</code>? </p>