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dpcpp-compiler.md: add document for icx installation

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Signed-off-by: Naveen Saini <naveen.kumar.saini@intel.com>
Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>
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Naveen Saini 2022-11-22 16:42:17 +08:00 committed by Anuj Mittal
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Intel(R) oneAPI DPC++/C++ Compiler (ICX) toolchain
==========================================================================
Get Started with the Intel oneAPI DPC++/C++ Compiler:
https://www.intel.com/content/www/us/en/developer/tools/oneapi/dpc-compiler.html#
Getting Started
===============
Clone the required layers and include them in bblayers.conf:
```
git clone https://git.openembedded.org/openembedded-core
git clone https://git.openembedded.org/bitbake
git clone https://git.openembedded.org/meta-openembedded
git clone https://github.com/kraj/meta-clang.git
git clone https://git.yoctoproject.org/meta-intel
$ source openembedded-core/oe-init-build-env
$ bitbake-layers add-layer ../meta-openembedded/meta-oe/
$ bitbake-layers add-layer ../meta-intel
$ bitbake-layers add-layer ../meta-clang
```
Distro
======
Note that oneAPI DPC++/C++ compiler currently only works when the vendor string is "oe".
```
DISTRO ?= "nodistro"
```
MACHINE configuration
=====================
```
MACHINE ?= "intel-skylake-64"
```
Package installation
====================
```
# To include OpenCL driver that might be needed when compiling SYCL programs, include:
IMAGE_INSTALL:append = " intel-compute-runtime intel-graphics-compiler"
# To install only runtime libraries, include:
IMAGE_INSTALL:append = " intel-oneapi-dpcpp-cpp-runtime intel-oneapi-dpcpp-cpp-runtime-dev"
# To install the toolchain, include:
IMAGE_INSTALL:append = " intel-oneapi-dpcpp-cpp intel-oneapi-dpcpp-cpp-dev"
```
in local.conf.
Build an image
==============
```
$ bitbake core-image-minimal
```
Including oneAPI C++/DPC++ compiler in generated SDK toolchain
==============================================================
The compiler is not included in the generated SDK by default. If it is expected to be part of SDK, add ICXSDK = "1" in local.conf:
```
ICXSDK = "1"
```
Generate SDK:
```
bitbake core-image-minimal -c populate_sdk
```
To setup PATH variables on target
=================================
Once image is booted successfully, some variables would need to be exported to make sure compiler can be used:
```
$ source /opt/intel/oneapi/compiler/2022.1.0/env/vars.sh
$ mkdir -p /lib64
$ ln -sf /lib/ld-linux-x86-64.so.2 /lib64/ld-linux-x86-64.so.2
```
Build application and run
=========================
To compile a sycl application, for example:
```
$ icpx --target=x86_64-oe-linux -fsycl simple-sycl-app.c -o simple-sycl-app
```
To run:
```
$ ./simple-sycl-app
```