Using openmpi in 1.8.0 on MacOS

[barlage]

As part of the discussion to get ufs-weather-model to work on MacOS, I followed instructions from @natalie-perlin for building 1.8.0 ufs-weather-model-env. This seems to have been successful.

In addition to the quest to run ufs-weather-model on my Mac (to date unsuccessful for me with any spack-stack version), I also have used spack-stack (1.6 on linux and 1.7 on mac) to run the simple land-only system ufs-land-driver. This system only requires Fortran, MPI and NetCDF.

As an aside, when I try to help other users of ufs-land-driver test their systems, I put together a simplified version of the driver that only tests MPI. Since my ufs-land-driver is failing with 1.8.0, I went back to test this MPI-only code and am getting this:

mpif90 -o ufsLand.exe ../driver/test_vector_sum.o ../mpi/mpi_land.o 
ld: warning: -commons use_dylibs is no longer supported, using error treatment instead
ld: warning: -commons use_dylibs is no longer supported, using error treatment instead
ld: common symbol '_mpi_fortran_argv_null_' from '/Users/michael.barlage/src/testing/netcdf_mpi/mpi_no_netcdf/driver/test_vector_sum.o' conflicts with definition from dylib '_mpi_fortran_argv_null_' from '/Users/michael.barlage/packages/spack-stack-1.8.0/envs/ufs/install/apple-clang/15.0.0/openmpi-5.0.3-hmarleo/lib/libmpi_usempi_ignore_tkr.40.dylib'
collect2: error: ld returned 1 exit status

with minimal loaded modules

$ module list

Currently Loaded Modules:
  1) stack-apple-clang/15.0.0   3) zlib/1.2.13     5) stack-openmpi/5.0.3
  2) pmix/5.0.1                 4) openmpi/5.0.3

This seems similar to this. 1.8.0 uses openmpi/5.0.3 and it seems maybe this issue has been dealt with in openmpi/5.0.4, but I'm out of my range of understanding on these things. I see develop is now using openmpi/5.0.5. So, after that long intro, I guess my questions are:

1. should I expect 1.8.0 to work for this simple test? and if so, is there something I need to add (flags, etc.) to address this linker conflict?
2. would you recommend that I use some hash past 1.8.0 that uses an openmpi >= 5.0.4 where this may have been addressed?

My system: MacOS/M3/Sonoma 14.7.2/Xcode 15.4/CLT 15.3
GNU Fortran (Homebrew GCC 13.3.0) 13.3.0