[Core] Adding support for Intel LLVM compiler (aka ICX, aka DPC++)

[loumalouomega]

📝 Description

This PR involves changes to the kratos_export_api.h file:

1. Header has been cleaned up.

2. The header guard (#ifndef KRATOS_EXPORT_API_H) was replaced with a #pragma once directive, which is a modern and more efficient way to prevent multiple inclusions of the header.

3. Conditional declarations of explicit template instances (KRATOS_API_EXTERN) were updatedto accommodate Intel LLVM (aka ICX, aka DPC++) compilers on Windows.

For now compilation only works with Ninja, settings must be as following:

@echo off
rem Please do not modify this script

rem For any question please contact with us in:
rem  - https://github.com/KratosMultiphysics/Kratos

rem Optional parameters:
rem You can find a list will all the compiation options in INSTALL.md or here:
rem  - https://github.com/KratosMultiphysics/Kratos/wiki/Compilation-options

rem Set variables
if not defined KRATOS_SOURCE set KRATOS_SOURCE=%~dp0..
if not defined KRATOS_BUILD set KRATOS_BUILD=%KRATOS_SOURCE%/build

rem oneAPI call and set compiler
call "C:\Program Files (x86)\Intel\oneAPI\setvars.bat"
set CC=icx.exe
set CXX=icx.exe
@REM Only Ninja compiler is supported with Intel LLVM
set CMAKE_GENERATOR=Ninja


rem Warning: In windows this option only works if you run through a terminal with admin privileges
rem set KRATOS_INSTALL_PYTHON_USING_LINKS=ON

rem Set basic configuration
if not defined KRATOS_BUILD_TYPE set KRATOS_BUILD_TYPE=Release
if not defined BOOST_ROOT set BOOST_ROOT=C:\CompiledLibs\boost_1_67_0
if not defined PYTHON_EXECUTABLE set PYTHON_EXECUTABLE=C:\Windows\py.exe
if not defined NUMBER_OF_COMPILATION_CORES set NUMBER_OF_COMPILATION_CORES=%NUMBER_OF_PROCESSORS%

rem Set applications to compile
set KRATOS_APP_DIR=applications
set KRATOS_APPLICATIONS=
CALL :add_app %KRATOS_APP_DIR%\LinearSolversApplication;
CALL :add_app %KRATOS_APP_DIR%\StructuralMechanicsApplication;
CALL :add_app %KRATOS_APP_DIR%\FluidDynamicsApplication;

rem Clean
del /F /Q "%KRATOS_BUILD%\%KRATOS_BUILD_TYPE%\cmake_install.cmake"
del /F /Q "%KRATOS_BUILD%\%KRATOS_BUILD_TYPE%\CMakeCache.txt"
del /F /Q "%KRATOS_BUILD%\%KRATOS_BUILD_TYPE%\CMakeFiles"

rem Enable this if your build is slow and you have a multi-core machine
rem set KRATOS_PARALLEL_BUILD_FLAG=/MP4

rem Configure
@echo on
cmake                                              ^
-G "%CMAKE_GENERATOR%"                             ^
-H"%KRATOS_SOURCE%"                                ^
-B"%KRATOS_BUILD%\%KRATOS_BUILD_TYPE%"             ^
-DUSE_EIGEN_MKL=OFF                                ^
-DCMAKE_CXX_FLAGS=" %KRATOS_PARALLEL_BUILD_FLAG% " ^
-DKRATOS_GENERATE_PYTHON_STUBS=ON

rem Build
cmake --build "%KRATOS_BUILD%/%KRATOS_BUILD_TYPE%" --target install -- -j%NUMBER_OF_COMPILATION_CORES%
goto:eof

rem Function to add apps
:add_app
set KRATOS_APPLICATIONS=%KRATOS_APPLICATIONS%%1;
goto:eof

Thanks @roigcarlo

🆕 Changelog

• Adding support for Intel LLVM compiler (aka ICX, aka DPC++)
• Update configure
• Fix msvc + dpcpp being non-conforming with the standard when expanding

[loumalouomega]

We may think to add the compìler to the CI?

[loumalouomega]

We may think to add the compìler to the CI?

Maybe replacing the just core compilation?

[roigcarlo]

Just as track, currently we have an hard blocker in the linking stage as we are exceeding the number of exposed symbols allowed by the linker.

Should be possible to overcome with -bigobj or /bigobj but the icx-2025 seems to ignore those.

[loumalouomega]

Just as track, currently we have an hard blocker in the linking stage as we are exceeding the number of exposed symbols allowed by the linker.

Should be possible to overcome with -bigobj or /bigobj but the icx-2025 seems to ignore those.

Looks like the abbys is looking us...