Comment (by Roland Haas):

We have a list of tested compilers on https://github.com/eschnett/CarpetX/wiki/CompilerCompatibility so we could for now add the thornlist to master to see what (not if, we know something will) breaks and then get started fixing things. gcc-9 is the earliest gcc compiler that was found to work which is newer than the current minimum of gcc-6 (for C++11), so we may have to scout out which OS / distros / package manager provide older gcc by default (or disable-thorns the CarpetX thorns in generic.ini which is opaque to users usually).

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2753/add-carpetx-thorns-to-einstein-toolkit