Peter Scheibel 22a45e010a Bugfix: Support old installations using Cray MPICH (#20663) ... #20076 moved Cray-specific MPICH support from the Spack MPICH package to a new cray-mpich Package. This broke existing package installs using external mpich on Cray systems. This PR keeps the cray-mpich package but restores the Cray-specific MPICH support for older installations. In the future this support should be removed from the Spack mpich package and users should be directed to use cray-mpich on Cray.		2021-01-04 17:19:08 -08:00
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spack	Bugfix: Support old installations using Cray MPICH (#20663)	2021-01-04 17:19:08 -08:00