[MacPorts] #58260: gcc{6, 7, 8, 9} : Build failures due to "Atomic" error with macOS 10.4.4 and Xcode 10.2

[MacPorts]

#58260: gcc{6,7,8,9} : Build failures due to "Atomic" error with macOS 10.4.4 and
Xcode 10.2
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  Reporter:  physicsbeany                        |      Owner:  (none)
      Type:  defect                              |     Status:  new
  Priority:  Normal                              |  Milestone:
 Component:  ports                               |    Version:  2.5.4
Resolution:                                      |   Keywords:  mojave
      Port:  gcc9 gcc8 gcc7 gcc6 libgcc-devel    |
  libgcc8 libgcc7 libgcc6                        |
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Comment (by cjones051073):

 Yes, I did check the logs and saw Xcode 10.2 was used in the failed
 builds.

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Ticket URL: <https://trac.macports.org/ticket/58260#comment:17>
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