Problems with OpenCL helloworld - opencl

Question

i´m new to OpenCl and i´m trying to learn it right know.
I installed Intel® SDK for OpenCL™ Applications and now i´m trying to use it with visual studio 2015.
When i´m trying to run an hello world example it returns an error at the "program.build" -part in the following codepart.
Can somebody tell me what i´m missing?
Thanks :)
The consol returns this:
Using platform: Intel<R> OpenCL
Using device: Intel<R> Core<TM> i7-3770 CPU e 3.40 GHz
-44
Error building:
Examplecode:
//get all platforms (drivers)
std::vector<cl::Platform> all_platforms;
cl::Platform::get(&all_platforms);
if (all_platforms.size() == 0) {
std::cout << " No platforms found. Check OpenCL installation!\n";
exit(1);
}
cl::Platform default_platform = all_platforms[0];
std::cout << "Using platform: " << default_platform.getInfo<CL_PLATFORM_NAME>() << "\n";
//get default device of the default platform
std::vector<cl::Device> all_devices;
default_platform.getDevices(CL_DEVICE_TYPE_ALL, &all_devices);
if (all_devices.size() == 0) {
std::cout << " No devices found. Check OpenCL installation!\n";
exit(1);
}
cl::Device default_device = all_devices[0];
std::cout << "Using device: " << default_device.getInfo<CL_DEVICE_NAME>() << "\n";
cl::Context context({ default_device });
cl::Program::Sources sources;
// kernel calculates for each element C=A+B
std::string kernel_code =
" void kernel simple_add(global const int* A, global const int* B, global int* C){ "
" C[get_global_id(0)]=A[get_global_id(0)]+B[get_global_id(0)]; "
" } ";
sources.push_back({ kernel_code.c_str(),kernel_code.length() });
cl::Program program(context, sources);
if (**program.build({ default_device }) != CL_SUCCESS**) {
std::cout << program.build({ default_device }) <<"\n";
std::cout << " Error building: " << program.getBuildInfo<CL_PROGRAM_BUILD_LOG>(default_device) << "\n";
exit(1);
}

Answer 1

Error code -44 means that "the program object is invalid". However this is inconclusive and hints to some other issue that corrupts memory. Also see this question.
Calling program.build() twice is - although not good practice - not the issue here, but maybe some threading issues? The problem certainly is not in the code snipped you provided.