title: Using gdb with GMP variables
body: <p>I am debugging some C code with gdb. My program has a variable of type <code>mpz_t * retval</code>. If I run the command</p>
  
  <pre><code>print *retval
  </code></pre>
  
  <p>I get the output</p>
  
  <pre><code>$23 = {{
      _mp_alloc = 6, 
      _mp_size = 5, 
      _mp_d = 0x1001008d0
  }}
  </code></pre>
  
  <p>Is there anything else I can do to get more information about the value stored in <code>retval</code>?</p>