[Build] Fix Build setup for oneAPI backend on Windows

まず afoneapi ターゲットの CMake 構成と関連する PR #3610 を確認し、oneAPI Basekit 2023.2 以降を使用する Windows 上で cmake --build . --target afoneapi を実行して失敗を再現します。Visual Studio Generator が sort_by_key targets と oneDPL headers を含めて afoneapi のビルドに成功すれば完了です。

Versions of Intel's oneAPI Basekit after 2023.2 have changed the CMake workflow for using SYCL with Intel's compiler. Therefore, currently building ArrayFire with CMake and the Visual Studio Generator is not possible.

Description

• Additional details about the errors during the build:

  1. Setting the language of a source file to SYCL causes the Visual Studio Generator to ignore and not set any Build Step to it. The first errors caused by this are observed on the sort_by_key_${SBK_TYPE} targets required by target afoneapi

  2. When adding SYCL to a target, the DPL includes are by default not added to the include directories of the targets causing a include not found compilation error on the #include <oneapi/dpl/algorithm> lines.

• What do you suspect is causing the issue?/Fixes

  1. According to Intel oneAPI DPC++ Compiler Reference, a find_package(IntelSYCL REQUIRED) and add_sycl_to_target lines are required in CMake to force a source file to be build with a SYCL compiler. Furthermore, a newer CMake version requisites must also be set.
  2. To fix this, a find_package(oneDPL REQUIRED) must be added for cmake to find the dpl package. Then, it must be added to the include directories of the target.

• Which steps in the (wiki)[https://github.com/arrayfire/arrayfire/wiki] failed: cmake --build . --target afoneapi

• What operating system and/or distro are you using?: Windows 10/11

• Versions of the packages related to this bug: oneAPI Basetoolkit >= 2023.2

For more information look at the PR #3610