Detect if c++11 is enabled in NVCC

I would like to detect whether a .cu file is compiled with C++11 support enabled. At the moment i have the following:

#if CUDART_VERSION < 7050
  #define C11SUPPORTED 0
#else
  #define C11SUPPORTED 1
#endif

However this is not working because even though C++11 is supported, it is not enabled unless -std=c++11 flag is passed. Is there perhaps something else defined when -std=c++11 flag is passed?