*
                                 *  \param[in] x  Value to check compile-time constantness of.
                                 *
-                                *  \return Boolean true if the given value is known to be a compile time constant, false otherwise.
+                                *  \return Boolean \c true if the given value is known to be a compile time constant, \c false otherwise.
                                 */
                                #define GCC_IS_COMPILE_CONST(x)               __builtin_constant_p(x)
                        #else