title: gdb reverse stepping - not supported in Linux?
body: <pre><code>(gdb) reverse-step
  Target child does not support this command.
  </code></pre>
  
  <p>This is in Linux 2.6.18</p>
  
  <p>Does the kernel not support it?  Is there a special gcc arg I need?</p>
  
  <pre><code> gcc --version
  gcc (GCC) 4.1.2 20080704 (Red Hat 4.1.2-52)
  </code></pre>