[MacPorts] #39428: mpich should have variant +gcc47 by default

[MacPorts]

#39428: mpich should have variant +gcc47 by default
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 Reporter:  dstrubbe@…   |      Owner:  macports-tickets@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:  2.1.3
 Keywords:  haspatch     |       Port:  mpich
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 For ports such as arpack and netcdf-fortran which have a +mpich variant,
 which in turns needs mpif77, it would be helpful if mpich by default used
 a variant that provides a Fortran wrapper. Otherwise, listing this port as
 a dependency just leads to an unusable being installed that doesn't
 satisfy the dependency. +gcc47 seems the most popular among ports now.
 That is the one used for openmpi, for example. I have provided a patch
 adapted from the openmpi Portfile.

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Ticket URL: <https://trac.macports.org/ticket/39428>
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