IDINPARENSEXT

Message        <Context> accepting an identifier enclosed in
               parentheses as the second argument to va_start is a
               language extension.

Description    The C standard states that the second argument to
               va_start must be an identifier.  For compatibility
               with other C compilers, HP C will accept an
               identifier enclosed in parentheses.  Be aware that
               this program does not conform to the standard and may
               be rejected by other compilers.

User Action    Remove the parentheses.