OpenCL Kernel code compile error - Visual Studio 2019

Question

I'm kind of new to OpenCL programming and am trying to run a simple vector addition code in VS 2019. However, I can't get the .cl code to compile. It's showing these 6 errors when trying to build the program:

Error C2144 syntax error: 'void' should be preceded by ';'

Error C4430 missing type specifier - int assumed. Note: C++ does not support default-int

Error C2065 '__global': undeclared identifier

Error C2146 syntax error: missing ')' before identifier 'float4'

Error C2143 syntax error: missing ';' before '{'

Error C2447 '{': missing function header (old-style formal list?)

This is my kernel code:

__kernel void add_numbers(__global float4* data,
    __local float* local_result, __global float* group_result) {

    float sum;
    float4 input1, input2, sum_vector;
    uint global_addr, local_addr;

    global_addr = get_global_id(0) * 2;
    input1 = data[global_addr];
    input2 = data[global_addr + 1];
    sum_vector = input1 + input2;

    local_addr = get_local_id(0);
    local_result[local_addr] = sum_vector.s0 + sum_vector.s1 +
        sum_vector.s2 + sum_vector.s3;
    barrier(CLK_LOCAL_MEM_FENCE);

    if (get_local_id(0) == 0) {
        sum = 0.0f;
        for (int i = 0; i < get_local_size(0); i++) {
            sum += local_result[i];
        }
        group_result[get_group_id(0)] = sum;
    }
}

I have added the include and lib directories and linked them properly. I couldn't find many fixes for this error after googling. Please help me out...

UPDATE : I fixed it

Hello everyone, I found the solution to this problem. I removed the .cl file from VS projects and then re-added it (optional). I also changed file open option to have "rb" instead of "r" ( fopen(filename,"rb") ). Now I'm able to run it!

ProjectPhysX ProjectPhysX · Accepted Answer · 2020-10-12T07:17:34

Your issue was that the C++ compiler wanted to compile the OpenCL code. You can exclude the file from the VS project and read it with fstream at runtime to get the kernel code string, or you can embed the kernel code string right into the executable via stringification macro:

#include <string>
#define R(...) string(#__VA_ARGS__" ")
string get_opencl_code() { return R(

// put your OpenCL code here

);}

OpenCL Kernel code compile error - Visual Studio 2019

1 Answers