mingw/info/gdb/C-Checks.html

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  19 <h5 class="subsubsection">C and C<tt>++</tt> type and range checks</h5>
  20
  21    <p>By default, when GDB parses C or C<tt>++</tt> expressions, type checking
  22 is not used.  However, if you turn type checking on, GDB
  23 considers two variables type equivalent if:
  24
  25      <ul>
  26 <li>The two variables are structured and have the same structure, union, or
  27 enumerated tag.
  28
  29      <li>The two variables have the same type name, or types that have been
  30 declared equivalent through <code>typedef</code>.
  31
  32    </ul>
  33
  34    <p>Range checking, if turned on, is done on mathematical operations.  Array
  35 indices are not checked, since they are often used to index a pointer
  36 that is not itself an array.
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