New to OpenCL. Getting Program.build error after following an example.

Windows 10
Intel Core i7
NVidia GeForce 1080

I have been following along this guys tutorials up on YouTube.
https://www.youtube.com/channel/UCB59JrgCNoRddloox7ySkBQ

I am on video 6 of 9
I have followed his tutorial exactly. I have even created my .CL file. Ensured that it’s in the same folder as the executable. However, my app is crashing on


err = program.build("-cl-std=CL1.2");

I am getting the error

ERROR: clBuildProgram(-11)

I’m hoping someone can help me figure out why I might be getting this error. Again, I am very new… As in, this is my second day trying to learn OpenCL. :slight_smile:


#define CL_USE_DEPRECATED_OPENCL_2_0_APIS

#include "stdafx.h"
#include <iostream>
#include <vector>
#include <fstream>
#include <CL/cl.hpp>
using namespace std;


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

	auto platform = platforms.front();

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


	auto device = devices.front();
	std::ifstream hellowWorldFile("FirstOpenCL.cl");
	std::string src(std::istreambuf_iterator<char>(hellowWorldFile), (std::istreambuf_iterator<char>()));
	
	cl::Program::Sources sources(1, std::make_pair(src.c_str(), src.length() + 1));

	cl::Context context(device);
	cl::Program program(context, sources);
	
	cl_int err;
	try
	{
		err = program.build("-cl-std=CL1.2");
	}
	catch (cl::Error errA)
	{
		std::cerr
			<< "ERROR: "
			<< errA.what()
			<< "("
			<< errA.err()
			<< ")"
			<< std::endl;

	}

	char buf[16];
	cl::Buffer memBuff(context, CL_MEM_WRITE_ONLY|CL_MEM_HOST_READ_ONLY, sizeof(buf));
	cl::Kernel kernel(program, "FirstOpenCL", &err);
	kernel.setArg(0, memBuff);

	cl::CommandQueue queue(context, device);
	queue.enqueueTask(kernel);
	queue.enqueueReadBuffer(memBuff, CL_TRUE, 0, sizeof(buf), buf);

	std::cout << buf;
	std::cin.get();

	return 0;
}

Here is the opencl file


_kernel void FirstOpenCL(__global char* data)
{
	data[0] = 'H';
	data[1] = 'e';
	data[2] = 'l';
	data[3] = 'l';
	data[4] = 'o';
	data[5] = '';
	data[6] = 'W';
	data[7] = 'o';
	data[8] = 'r';
	data[9] = 'l';
	data[10] = 'd';
	data[11] = '!';
	data[12] = '
';
}

You should always call program.getBuildInfo(CL_PROGRAM_BUILD_LOG, …) to get the locations of compilation errors.

In your case, it probably comes from data[5] = ‘’ which should be instead data[5] = ’ ’ (with a space inside the quotes).

Agreed; the log will tell you where the error is.

BTW, here’s a nice page with all the OpenCL error codes: https://streamhpc.com/blog/2013-04-28/opencl-error-codes/

-11 is CL_BUILD_PROGRAM _FAILURE

PERFECT! I fixed that data[5] to include a space between the quotes and it worked!!!
THANK YOU!