[MacPorts] #59113: gcc8: cannot find systems headers with Xcode 11

[MacPorts]

#59113: gcc8: cannot find systems headers with Xcode 11
-----------------------+--------------------
  Reporter:  abyrvalk  |      Owner:  (none)
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:
      Port:  gcc8      |
-----------------------+--------------------

Comment (by mouse07410):

 {{{-isysroot `xcrun --show-sdk-path`}}} workaround works, and is simple.
 The problem with it is that it breaks platform independence - now the
 source code must figure whether it's on Mac or not, and if on Mac - add
 this workaround.

 @Joshua, what do you mean by "doesn't ... build"? gcc itself cannot be
 compiled from its source under Xcode-11 (10.15 SDK)?

-- 
Ticket URL: <https://trac.macports.org/ticket/59113#comment:8>
MacPorts <https://www.macports.org/>
Ports system for macOS