Jetson TK1 Use CUDA 6.5 After Upgrade to Ubuntu 16.04

After previously I am successfully upgrading my Jetson TK1 in here,

Jetson TK1 Upgrade OS to Ubuntu 16.04

Then check nvcc ,

ubuntu@tegra-ubuntu:~$ nvcc --version
nvcc: NVIDIA (R) Cuda compiler driver
Copyright (c) 2005-2014 NVIDIA Corporation
Built on Wed_Nov_12_15:57:57_CST_2014
Cuda compilation tools, release 6.5, V6.5.30

I see there nvcc still recognized. But, when I try to run simple CUDA program like this,

#include <iostream>
#include <math.h>
// Kernel function to add the elements of two arrays
__global__
void add(int n, float *x, float *y)
{
  for (int i = 0; i < n; i++)
    y[i] = x[i] + y[i];
}

int main(void)
{
  int N = 1<<20;
  float *x, *y;

  // Allocate Unified Memory – accessible from CPU or GPU
  cudaMallocManaged(&x, N*sizeof(float));
  cudaMallocManaged(&y, N*sizeof(float));

  // initialize x and y arrays on the host
  for (int i = 0; i < N; i++) {
    x[i] = 1.0f;
    y[i] = 2.0f;
  }

  // Run kernel on 1M elements on the GPU
  add<<<1, 1>>>(N, x, y);
  // Wait for GPU to finish before accessing on host
  cudaDeviceSynchronize();

  // Check for errors (all values should be 3.0f)
  float maxError = 0.0f;
  for (int i = 0; i < N; i++)
    maxError = fmax(maxError, fabs(y[i]-3.0f));
  std::cout << "Max error: " << maxError << std::endl;

  // Free memory
  cudaFree(x);
  cudaFree(y);
  
  return 0;
}

Just give the code with name array_addition.cu , then compile using nvcc ,

nvcc array_addition.cu -o array_addition

It’s giving me error related to gcc not supported,

In file included from /usr/local/cuda/bin/../targets/armv7-linux-gnueabihf/include/cuda_runtime.h:59:0,
                 from <command-line>:0:
/usr/local/cuda/bin/../targets/armv7-linux-gnueabihf/include/host_config.h:82:2: error: #error -- unsupported GNU version! gcc 4.9 and up are not supported!
 #error -- unsupported GNU version! gcc 4.9 and up are not supported!

Then if you check, the gcc version,

ubuntu@tegra-ubuntu:~$ gcc --version
gcc (Ubuntu/Linaro 5.4.0-6ubuntu1~16.04.12) 5.4.0 20160609
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

It’s gives you newer than the original (gcc 4.8).

I just found the solution from here,

CUDA incompatible with my gcc version

By adding symlink from the supported gcc to the CUDA 6.5,

Before do that, first installing gcc 4.8 and g++4.8 ,

sudo apt-get install gcc-4.8 g++-4.8 -y

Add symlink,

sudo ln -s /usr/bin/gcc-4.8 /usr/local/cuda/bin/gcc 
sudo ln -s /usr/bin/g++-4.8 /usr/local/cuda/bin/g++

Then retry to build above Simple CUDA code, then program should be compiled successfully.