Hui Zhou comments

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                                            Hui Zhou

mpich-4.1a1 build failure with ch4:ucx, gcc-12

Ahh, we forgot about this ticket. Thanks for the reminder. We'll make sure to have it fixed and backport it to 4.1.1. cc @raffenet

ch4/am: support spawn in AM-Only

I don't think there is motivation to support spawn in `am-only`. `am-only` is mostly to serve a testing purpose rather than a key mode for practical configurations.

env: use mydef to template mpicc scripts

test:mpich/warnings/auto

env: use mydef to template mpicc scripts

test:mpich/submodules

env: use mydef to template mpicc scripts

> I've thought about this some and have a few questions. > > 1. Can the .bash versions of these scripts be removed? Do they offer anything that the .sh...

ch4/ofi: Add CVAR to set a preferred NIC per rank

![image](https://github.com/pmodels/mpich/assets/1496702/8868fcb6-e95a-400b-8f37-cb13be18a424) Please do not merge `main` into branch. Rather, rebase on top of `main`.

ch4/ofi: Add CVAR to set a preferred NIC per rank

Yes, you can merge it

4.2.0 build fails with clang as the base compilers

@rgayatri23 Does remove the custom `NVCC` and `NVCC_FLAGS` (thus using native `nvcc`) work?

4.2.0rc1 with (default) ch4 on macOS hangs during MPI_Finalize()

@eborisch Could you try set environment `FI_PROVIDER=tcp` ?

4.2.0rc1 with (default) ch4 on macOS hangs during MPI_Finalize()

We haven't been able to reproduce the issue locally. Please add comments if you continue to have issues. Manually setting `FI_PROVIDER` works but it will prevent it to use better...