[MacPorts] #58442: gcc9 (and other gccN) fails to install on Mojave, Xcode-10.2.1

[MacPorts]

#58442: gcc9 (and other gccN) fails to install on Mojave, Xcode-10.2.1
-------------------------+--------------------
  Reporter:  mouse07410  |      Owner:  (none)
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  gcc9        |
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Comment (by cjones051073):

 Replying to [comment:26 kencu]:
 > Oh, and whatever is the root cause of the issue mouse saw, I just have
 not had the time to dig on building gcc with different clang versions to
 see where the break point is, or if the issue is even reproducible -- it
 takes so damn long to build gcc...

 The build bots have all built gcc9 and gcc10 fine on macOS10.7+, which are
 the only platforms supported by these compilers. So work fine with the
 cctools llvm variants these platforms use by default.

-- 
Ticket URL: <https://trac.macports.org/ticket/58442#comment:30>
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