[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
-------------------------------------+-------------------------------------
  Reporter:  physicsbeany            |      Owner:  Nullstelllensatz
                                     |  <50169837+Nullstelllensatz@…>
      Type:  defect                  |     Status:  closed
  Priority:  Normal                  |  Milestone:
 Component:  ports                   |    Version:  2.5.4
Resolution:  fixed                   |   Keywords:  mojave
      Port:  gcc9 gcc8 gcc7 gcc6     |
  libgcc-devel libgcc8 libgcc7       |
  libgcc6                            |
-------------------------------------+-------------------------------------

Comment (by cjones051073):

 To be honest, I never considered the possibility to not have Xcode
 installed.

 Maybe it would work to just remove the version test. This would have to be
 tested though.

 Any reason you are installing from source, and not using the prebuilt
 binaries ? Do this, without Xcode installed, is probably not very well
 tested ground.

-- 
Ticket URL: <https://trac.macports.org/ticket/58260#comment:28>
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