[MacPorts] #59329: mpich-default: "error: Aborting because C++ compiler does not work"

[MacPorts]

#59329: mpich-default: "error: Aborting because C++ compiler does not work"
----------------------------+----------------------
  Reporter:  Schamschula    |      Owner:  dstrubbe
      Type:  defect         |     Status:  assigned
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:
Resolution:                 |   Keywords:
      Port:  mpich openmpi  |
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Comment (by MarcusCalhoun-Lopez):

 Using the compilers PG, the variant gccX can have two different meanings:
 1. Use GCC for **all** compilers (C, C++, etc.)
 1. Use GCC for Fortran **only**
 For case 2, `configure.cxx_stdlib` should not be changed, which is what
 happened in [https://github.com/macports/macports-
 ports/commit/0419e119aa8d74ee9834b1164ab8306073efeac5 a recent commit].

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Ticket URL: <https://trac.macports.org/ticket/59329#comment:11>
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