getCudaEnabledDeviceCount return 0

edit

I use cuda.

cudaError_t error = cudaGetDeviceCount(&count);

count is 1

and getCudaEnabledDeviceCount() returns 0 and I do not understand why...

Is it linked to HAVE_CUDA? I have build OpenCV with CMake WITH_CUDA checked.

//cuda_info.cpp
int cv::cuda::getCudaEnabledDeviceCount()
{
#ifndef HAVE_CUDA
    return 0;
#else
    int count;
    cudaError_t error = cudaGetDeviceCount(&count);

    if (error == cudaErrorInsufficientDriver)
        return -1;

    if (error == cudaErrorNoDevice)
        return 0;

    cudaSafeCall( error );
    return count;
#endif
}