Comment (by Roland Haas):

Mostly because I was trying for something that does not require compiler options. Cray pointers tend to require compiler options to be enabled (e.g. -fcray-pointer in gfortran) . The ET requires them (and sets options for them in simfactory) but Cactus never did (and cannot set compiler options only defaults which are then overwritten by user supplied option lists).

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2403/compile-failure-with-gfortran-10-when