Why can't I find the functions of the .cu in the CPP files?

Gaming and Visualization Technologies Visualization OptiX
1

Hi, I have a problem. When i want to use a function of .cu file in CPP files like:

void postProcess_gpu(uint32_t* _SrcImg, uint32_t* _DstImg, int _rows, int _cols, int _kernal_size_x, int _kernal_size_y, CUstream _stream) {

    dim3 block_size(32, 32);
    int row_size = _rows % block_size.x == 0 ? _rows / block_size.x : (_rows / block_size.x + 1);
    int col_size = _cols % block_size.y == 0 ? _cols / block_size.y : (_cols / block_size.y + 1);
    dim3 thread_size(row_size, col_size);
    postProcess_x << <block_size, thread_size, 0, _stream >> > (_SrcImg, _DstImg, _rows, _cols, _kernal_size_x);
    postProcess_y << <block_size, thread_size, 0, _stream >> > (_SrcImg, _DstImg, _rows, _cols, _kernal_size_y);
    //postProcess_mask << <block_size, thread_size, 0, _stream >> > (_SrcImg, _rows, _cols);
}

There is a error : Renderer.cpp.obj : error LNK2019: Inresolvable external symbols "void __cdecl postProcess_gpu (…)
But my .CU file has already generated a .OBJ file with the new setting CUDA_SOURCE_PROPERTY_FORMAT in CMAKE, so I don’t know why I can’t find this function?

2

This should work. Are you trying to call this function as an extern function? If so, you need to decorate postProcess_gpu as extern "C" and have an extern forward declaration of this function in the cpp file.