Evan Weinberg

> Thanks for the last few fixes. This looks good to go. Excellent --- I'm doing a few last checks (just making sure `clang-format` didn't accidentally do something stupid), and...

All comments addressed @mathiaswagner , let me know if you have any further thoughts, otherwise I can get this merged once Jenkins finishes.

Not strictly an answer, but do you have a specific need for GCC 10.\*? I believe I've seen that flavor of gcc have issues for "no good reason" before, and...

Not saying that the specific issue above is an error for "no good reason", I'm more implying that gcc 10 has a (personal) track record of being particularly difficult.

Digging into the Eigen repo, it looks like there were some known issues related to PowerPC (the top of that header queries the CPU arch). Fixes were merged only ~3...

Re-opening it for visibility, will close once a new Eigen release has been merged in.

> @weinbe2 sorry that I haven't gotten back to this yet. I started taking a look to see what I need to adjust in tmLQCD to support the changes here...

FYI, one of the recent merges of `develop` slightly broke this branch, will fix it this week.

Thoughts motivated by #1107 : 1. Why does QMP's `comm_rank_global` -> `QMP_get_node_number` work to always pick the global rank zero, as opposed to `comm_rank` -> `QMP_comm_get_node_number`? I'd assume `QMP_get_node_number` would...

For future reference, do not merge, it appears an issue creeped in not in `develop`. For my own convenience, a command that caused an issue was ``` LOCAL_DIM="32 32 32...