GFortran 15.1.0 not working with OpenCoarrays 2.10.2 and open-mpi 5.0.8

[cristiansinaloa]

Hello,

The dependencies for the Mac OS package manager, Homebrew, needs to be updated if gfortran 15.1.0 no longer supports open-mpi. As of now opencoarrays still has open-mpi as a dependency.

If you could please list an alternative MPI implementation and list it as a dependency on Homebrew I would really appreciated it.

Thanks again for the amazing work you guys do.

[vehre]

Hi,

I am so to say "responsible" for the change, that OpenMPI can not be used with OpenCoarrays from gcc-15 on. I am not on Mac so testing this is harder to me, but to my understanding is the [Brewfile](https://github.com/sourceryinstitute/OpenCoarrays/blob/main/Brewfile) used for HomeBrew on Mac OS, right? And that references mpich. Do you have any idea why is want openmpi? Again, I am not on Mac OS. It's difficult to me.

[rouson]

@zbeekman can provide the best explanation. My limited understanding is that even though Homebrew can install MPICH, the brew core satisfies MPI dependencies with OpenMPI. I think the way to override that is with a tap. It appears to me that the formula to which @vehre linked is a tap so possibly that will do the trick.