Go home libstdc++ <chrono>, you're drunk.

gistfile1.cpp

#ifdef _GLIBCXX_USE_CLOCK_MONOTONIC
    /// steady_clock
    struct steady_clock
    {
      typedef chrono::nanoseconds 				duration;
      typedef duration::rep	  				rep;
      typedef duration::period	  				period;
      typedef chrono::time_point<steady_clock, duration> 	time_point;

      static constexpr bool is_steady = true;

      static time_point
      now() noexcept;
    };
#else
    typedef system_clock steady_clock;
#endif

    typedef system_clock high_resolution_clock;