[MacPorts] #58260: libgcc8 build fails due to "Atomic" error on Mojave

[MacPorts]

#58260: libgcc8 build fails due to "Atomic" error on Mojave
---------------------------+--------------------
  Reporter:  physicsbeany  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.5.4
Resolution:                |   Keywords:  mojave
      Port:  libgcc8       |
---------------------------+--------------------

Comment (by cjones051073):

 Just to complete the Mac OS package manager set ...

 https://github.com/fink/fink-distributions/issues/386

 There is also a link there to an upstream gcc bug report.

 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89864

 The gcc devs seem to confirm in their view its an Xcode 10.2 issue.

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Ticket URL: <https://trac.macports.org/ticket/58260#comment:9>
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