[MacPorts] #70176: Error: No such port: mpich-clang18

[MacPorts]

#70176: Error: No such port: mpich-clang18
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  Reporter:  Schamschula      |      Owner:  eborisch
      Type:  defect           |     Status:  assigned
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:  2.9.3
Resolution:                   |   Keywords:
      Port:  mpich sundials5  |
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Comment (by barracuda156):

 Replying to [comment:1 jmroot]:
 > Yes, and this will keep happening with every new clang version if the
 way these portgroups work stays as it is.

 The problem is not clang as such, the problem that compiler choice for
 C++17 was changed without considering that it breaks MPICH.

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Ticket URL: <https://trac.macports.org/ticket/70176#comment:3>
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