[MacPorts] #63608: openmpi/mpich: add support for clang12; evaluate clang13 (was: openmpi/mpich: add support for clang12)

[MacPorts]

#63608: openmpi/mpich: add support for clang12; evaluate clang13
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  Reporter:  mascguy        |      Owner:  mascguy
      Type:  enhancement    |     Status:  assigned
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:
Resolution:                 |   Keywords:
      Port:  openmpi mpich  |
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Description changed by mascguy:

Old description:

> Since MacPorts Clang 12 has had time to mature, it's worth testing both
> `openmpi` and `mpich` to see if they'll build and function with it.

New description:

 Since MacPorts Clang 12 has had time to mature, it's worth testing both
 `openmpi` and `mpich` to see if they'll build and function with it.

 It might also be worth testing with Clang 13 as well.

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Ticket URL: <https://trac.macports.org/ticket/63608#comment:1>
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