Tealeaf

[Sezoir]

Enable building and execution of the Tealeaf application with the LLVM Flang compiler.

[Sezoir]

Next steps: I am not planning to take on this project. This is just an initial report found. Please feel free to work on this.

TeaLeaf Repository:

https://github.com/UK-MAC/TeaLeaf

The main TeaLeaf repository contains several different versions of TeaLeaf for different implementations of TeaLeaf. For compiling with Fortran, we are interested in the TeaLeaf_ref repository.

Initial report for TeaLeaf_ref:

• Minimum version of Fortran required using gfortran: F2008
  • Required arguments to compile with version: "-fdec"
• How to compile with gfortran:
  1. First you can download the project by running in bash:

  git clone https://github.com/UK-MAC/TeaLeaf_ref.git
  cd TeaLeaf_ref
  

  2. For this project you require an MPI compiler. For this I used openmpi as a wrapper compiler around gfortran. Now you can compile the project by running:

  make COMPILER=GNU MPI_COMPILER=/path/to/mpifort C_MPI_COMPILER=/path/to/mpicc
  

  Where the paths to the MPI compilers are correctly substituted in to your MPI compilers.
• Does it compile with flang-new: No
  • Requires MPI which we don't currently support. Most MPI usage in global_mpi.f90, so you might be able to manually remove/replace required MPI usage.
  • Error received before MPI required when trying to compile:

  $ make COMPILER=GNU MPI_COMPILER=flang-new C_MPI_COMPILER=clang-12
  error: loc("./pack_kernel.f90":162:7): /.../f18-llvm-fork/flang/lib/Lower/Bridge.cpp:2091: not yet implemented procedure pointer assignment
  make: *** [Makefile:196: pack_kernel.o] Error 1
  

Versions:

• gcc version used: 9.3.0
• gfortran version used: 9.3.0
• flang-new, fir-dev branch, HEAD: fb8eb63
• clang-12: 12.0.0
• openmpi version used: 4.1.1
• TeaLeaf_ref, master branch, HEAD: 019aa2f7da9df9559e6a0890d14f961738711ca7
• Architecture for compilation: aarch64