topic Re:Using third party compilers with oneAPI in Intel® oneAPI DPC++/C++ Compiler

Using third party compilers with oneAPI

mcolacchio — Tue, 18 Apr 2023 17:16:36 GMT

Hi everyone,

I've been trying to compile a small program as a proof of concept using icpx and g++. I've been following the instructions provided here, but I can't get it to work. Specifically, when I run the following command:

icpx -fsycl -fsycl-device-only -Xclang -fsycl-int-header=add-vector-host.h add-vector.cpp

it generates an empty header file. I'm not sure what I'm doing wrong - the bc file seems to be generated correctly, but there are no specifications on what to do with that file.

I'm using three different files: one with my host code, another with my function definition, and a header file. The program is just a simple vector addition. I've tried both a functor and a function with the SYCL_EXTERNAL macro, but neither has made any difference. If I compile everything with icpx it works just fine.

Any help or advice would be greatly appreciated. Thank you!

Re: Using third party compilers with oneAPI

VaishnaviV_Intel — Wed, 19 Apr 2023 10:55:27 GMT

Hi,

Thanks for posting in Intel Communities.

We are unable to reproduce your issue at our end.

We are using oneAPI 2023.1.0 version and Ubuntu 20.04.6 LTS Operating system.

Below is the sample code we used,

host.cpp

#include <CL/sycl.hpp> #include <iostream> #include "add-vector.h" int main() { constexpr int N = 10; // Create a SYCL queue cl::sycl::queue q; // Create input and output buffers on the device cl::sycl::buffer<float> in_buf{cl::sycl::range<1>(N)}; cl::sycl::buffer<float> out_buf{cl::sycl::range<1>(N)}; // Initialize input buffer on the host { auto in_ptr = in_buf.get_access<cl::sycl::access::mode::write>(); for (int i = 0; i < N; i++) { in_ptr[i] = i; } } // Launch the SYCL kernel q.submit([&](cl::sycl::handler& h) { auto in_ptr = in_buf.get_access<cl::sycl::access::mode::read>(h); auto out_ptr = out_buf.get_access<cl::sycl::access::mode::write>(h); h.parallel_for<class add_vector>(cl::sycl::range<1>(N), [=](cl::sycl::id<1> idx) { out_ptr[idx] = add(in_ptr[idx], 1.0f); }); }); // Read the output buffer from the device and print the results auto out_ptr = out_buf.get_access<cl::sycl::access::mode::read>(); for (int i = 0; i < N; i++) { std::cout << out_ptr[i] << " "; } std::cout << std::endl; return 0; }

add-vector.cpp

#include <CL/sycl.hpp> #include "add-vector.h" float add(float a, float b) { return a + b; }

add-vector.h

#ifndef ADD_VECTOR_H #define ADD_VECTOR_H float SYCL_EXTERNAL add(float a, float b); #endif

Here are the commands we tried, to execute the code:

source /opt/intel/oneapi/setvars.sh export LIBDIR=/opt/intel/oneapi/compiler/latest/linux/lib icpx -fsycl -c host.cpp -fPIC -o host.o icpx -fsycl -c add-vector.cpp -fPIC -o add-vector.o icpx -fsycl -fsycl-device-only -Xclang -fsycl-int-header=a_host.h host.cpp icpx -fsycl -fsycl-device-only -Xclang -fsycl-int-header=b_host.h add-vector.cpp g++ -std=c++17 -c host.cpp -o a_host.o -include a_host.h -fPIC -I/opt/intel/oneapi/compiler/latest/linux/include -I/opt/intel/oneapi/compiler/latest/linux/include/sycl g++ -std=c++17 -c add-vector.cpp -o b_host.o -include b_host.h -fPIC -I/opt/intel/oneapi/compiler/latest/linux/include -I/opt/intel/oneapi/compiler/latest/linux/include/sycl icpx -fPIC -fsycl -fsycl-link host.o add-vector.o -o device.o g++ a_host.o b_host.o device.o -L$LIBDIR -lOpenCL -lsycl -o finalexe.exe ./finalexe.exe

Please let us know, if you still face any issues.

Thanks & Regards,

Vankudothu Vaishnavi.

Re:Using third party compilers with oneAPI

VaishnaviV_Intel — Tue, 25 Apr 2023 10:26:12 GMT

Hi,

Has the information provided above helped? If yes, could you please confirm whether we can close this thread from our end?

Thanks & Regards,

Vankudothu Vaishnavi.

Re:Using third party compilers with oneAPI

VaishnaviV_Intel — Tue, 02 May 2023 07:29:44 GMT

Hi,

We assume that your issue is resolved. If you need any additional information, please post a new question as this thread will no longer be monitored by Intel.

Thanks & Regards,

Vankudothu Vaishnavi.