Missing MPI C++ bindings when using FEI

[greene30]

I'm trying to build hypre on macOS as a shared library with FEI. I'm getting some undefined symbol errors for some MPI C++ functions.

Undefined symbols for architecture arm64:
  "__ZN3MPI3Win4FreeEv", referenced from:
      __ZTVN3MPI3WinE in FEI_HYPRE_Impl.cxx.o
      __ZTVN3MPI3WinE in LLNL_FEI_Impl.cxx.o
      __ZTVN3MPI3WinE in LLNL_FEI_Fei.cxx.o
      __ZTVN3MPI3WinE in LLNL_FEI_LSCore.cxx.o
      __ZTVN3MPI3WinE in LLNL_FEI_Solver.cxx.o
      __ZTVN3MPI3WinE in LLNL_FEI_Matrix.cxx.o
      __ZTVN3MPI3WinE in HYPRE_LSC_aux.cxx.o
      ...

I was able to fix the issue by adding the following lines to src/CMakeLists.txt at the end of the "if (HYPRE_USING_FEI)" block between lines 553 and 570.

  if (NOT HYPRE_SEQUENTIAL)
    target_link_libraries(${PROJECT_NAME} PUBLIC MPI::MPI_CXX)
  endif(NOT HYPRE_SEQUENTIAL)