Set Flags for OpenMP in CMake

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CMake has a standard module for testing if the compiler supports OpenMP.

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cmake_minimum_required(VERSION 3.17)
project(OpenMPTest)

set(CMAKE_CXX_STANDARD 20)

add_executable(${PROJECT_NAME} main.cpp)

find_package(OpenMP REQUIRED)  # Find the package
target_link_libraries(${PROJECT_NAME} PRIVATE OpenMP::OpenMP_CXX)  # Link against it for C++