Compiling OpenCL program with oneAPI

[matthias11]

Dear all,

I cannot get the following program to compile with oneAPI (from command line). I use icpx -fsycl vectorAdd.cpp -o vectorAdd.exe. No matter what I try (CL/opencl.hpp)

I always get error messages. How can this be done?

vectorAdd.cpp code is shown below.

Many thanks and best wishes,

Matthias

vectorAdd.cpp:

#include <OpenCL/opencl.hpp>
#include <iostream>
#include <cassert>
#include <numeric>

int main() {
std::vector<cl::Platform> platforms;
cl::Platform::get(&platforms);

assert(platforms.size() > 0);

auto platform = platforms.front();

std::vector<cl::Device> devices;
platforms.front().getDevices(CL_DEVICE_TYPE_GPU, &devices);

assert(devices.size() > 0);

auto device = devices.front();
auto vendor = device.getInfo<CL_DEVICE_VENDOR>();
auto version = device.getInfo<CL_DEVICE_VERSION>();

std::cout << "Device Vendor: " << vendor << std::endl;
std::cout << "Device Version: " << version << std::endl;

cl::Context context(device);
cl::Program::Sources sources;

std::string kernelCode =
" void kernel squareArray(global int* input, global int* output) {"
" size_t gid = get_global_id(0);"
" output[gid] = input[gid] * input[gid];"
" }";
sources.push_back({kernelCode.c_str(), kernelCode.length()});

cl_int exitcode = 0;

cl::Program program(context, sources, &exitcode);
program.build();
assert(exitcode == CL_SUCCESS);

cl::Kernel kernel(program, "squareArray", &exitcode);
assert(exitcode == CL_SUCCESS);

auto workGroupSize = kernel.getWorkGroupInfo<CL_KERNEL_WORK_GROUP_SIZE>(device);
std::cout << "Kernel Work Group Size: " << workGroupSize << std::endl;

std::vector<int> outVec(1024);
std::vector<int> inVec(1024);
std::iota(inVec.begin(), inVec.end(), 1);

cl::Buffer inBuf(context,
CL_MEM_READ_ONLY | CL_MEM_HOST_NO_ACCESS | CL_MEM_COPY_HOST_PTR,
sizeof(int) * inVec.size(),
inVec.data());
cl::Buffer outBuf(context,
CL_MEM_WRITE_ONLY | CL_MEM_HOST_READ_ONLY,
sizeof(int) * outVec.size());
kernel.setArg(0, inBuf);
kernel.setArg(1, outBuf);

cl::CommandQueue queue(context, device);

queue.enqueueNDRangeKernel(kernel, cl::NullRange, cl::NDRange(inVec.size()));
queue.enqueueReadBuffer(outBuf, CL_TRUE, 0, sizeof(int) * outVec.size(), outVec.data());

for (std::vector<int>::const_iterator i = outVec.begin(); i != outVec.end(); ++i)
std::cout << *i << std::endl;

return 0;
}

[Alex_Y_Intel]

Can you please try this simple case: 

#include <CL/cl.hpp>
#include <iostream>
#include <vector>
int main() {
  std::vector<cl::Platform> platforms;
  cl::Platform::get(&platforms);

return 0;

}

and let us know which compiler you can compile it successfully? 

[matthias11]

Hi all,

from the short test program you sent me I get CL/cl.hpp not found error.

Where can I get this file from and where is it supposed to be? I've upgraded to the latest oneAPI (August 2024).

Many thanks and best wishes,

Matthias

[Alex_Y_Intel]

Download OpenCL directory from here: https://github.com/ProjectPhysX/OpenCL-Wrapper/tree/master/src/ and store it in the same directory of your vectorAdd.cpp

Change your #include <OpenCL/opencl.hpp> to #include <CL/cl.hpp>

And do this: icpx vectorAdd.cpp -I./OpenCL/include -L./OpenCL/lib -lOpenCL