[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:  eborisch@…
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.1.3
Resolution:               |   Keywords:  haspatch
      Port:  mpich        |
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Comment (by dstrubbe@…):

 All that active_variants can do for the user here is explain why configure
 would fail for arpack (i.e. no mpif77). It cannot make the correct variant
 be installed in the first place. But, if mpich had +gcc47 as default, then
 the situation I describe above would end in a successful build, not an
 error message (however informative).

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Ticket URL: <https://trac.macports.org/ticket/39428#comment:5>
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