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A general description is here.
There is some support for building with Intel's LLVM-based compilers on ‘x86_64’ Linux, such as (C) ‘icx’, (C++) ‘ipcx’ and (Fortran) ‘ifx’ from oneAPI 2023.x.0.
There is support for using LLVM's ‘flang-new’ as the Fortran compiler from LLVM 16.0.x (preferably 17.0.0 or later).