Michael Kuhn 26d4d54a42 mpich: add 3.4 (#21007) ... This also switches the default device to ch4 and the default netmod to ofi (tcp does not exist for ch4).		2021-01-25 18:00:30 -06:00
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spack	mpich: add 3.4 (#21007)	2021-01-25 18:00:30 -06:00