error: function "atomicAdd(double *, double)" has already been defined

在编译deeplab_V2的时候，用Cuda-8.0，出现上述错误。
之前在cuda-7.5的时候，没有出现这个错误。在网上找到错误的原因，记录下来。
原文地址

CUDA 8.0 provides a definition of atomicAdd on double quantities that was not present in previous CUDA toolkits. The code you are working with also apparently provides its own definition/implementation, and this is the source of the error message. The correct fix is to make source code changes to the software in question to make it compatible with CUDA 8.

I had to modify the file common.cuh from the DeepLab_v2 master branch in the following way:

#ifndef CAFFE_COMMON_CUH_#define CAFFE_COMMON_CUH_#include <cuda.h>  #if !defined(__CUDA_ARCH__) || __CUDA_ARCH__ >= 600  #else  static __inline__ __device__ double atomicAdd(double *address, double val) {    unsigned long long int* address_as_ull = (unsigned long long int*)address;    unsigned long long int old = *address_as_ull, assumed;    if (val==0.0)      return __longlong_as_double(old);    do {      assumed = old;      old = atomicCAS(address_as_ull, assumed, __double_as_longlong(val +__longlong_as_double(assumed)));    } while (assumed != old);    return __longlong_as_double(old);  }  #endif#endif