mingw/info/stabs/Reference-Parameters.html

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  12 Node:<a name="Reference%20Parameters">Reference Parameters</a>,
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  19 <h4 class="subsection">Passing Parameters by Reference</h4>
  20
  21    <p>If the parameter is passed by reference (e.g., Pascal <code>VAR</code>
  22 parameters), then the symbol descriptor is <code>v</code> if it is in the
  23 argument list, or <code>a</code> if it in a register.  Other than the fact
  24 that these contain the address of the parameter rather than the
  25 parameter itself, they are identical to <code>p</code> and <code>R</code>,
  26 respectively.  I believe <code>a</code> is an AIX invention; <code>v</code> is
  27 supported by all stabs-using systems as far as I know.
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