[MacPorts] #55872: gcc7 @7.3.0: Selftests fail with "Illegal instruction: 4"

[MacPorts]

#55872: gcc7 @7.3.0: Selftests fail with "Illegal instruction: 4"
-----------------------+---------------------------
  Reporter:  chucko58  |      Owner:
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.4.2
Resolution:            |   Keywords:  sierra x86_64
      Port:  gcc7      |
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Comment (by kencu):

 Apparently that error indicates your processor is trying to run
 instructions that it can't understand:

 <https://stackoverflow.com/questions/14268887/what-is-the-illegal-
 instruction-4-error-and-why-does-mmacosx-version-min-10>

 Some instruction set has become enabled that your processor is not able to
 run, some linked library like `gmp` build on another processor but moved
 onto your your machine somehow, some misconfiguration in `mmacosx-version-
 min`, etc?

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Ticket URL: <https://trac.macports.org/ticket/55872#comment:2>
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