[MacPorts] #59088: Xcode update broke linkages

[MacPorts]

#59088: Xcode update broke linkages
---------------------------+--------------------
 Reporter:  rhc54          |      Owner:  (none)
     Type:  defect         |     Status:  new
 Priority:  Normal         |  Milestone:
Component:  ports          |    Version:  2.6.0
 Keywords:  xcode headers  |       Port:
---------------------------+--------------------
 Apple apparently included an Xcode update in a recent maintenance release.
 Since the update, I am unable to run many of the compiler ports (gcc,
 python) due to errors stating that system headers and libraries cannot be
 found. Investigation revealed that the ports were all configured with:

 --with-
 sysroot=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk

 However, the Xcode update apparently removed the MacOSX10.14.sdk and
 replaced it with MacOSX10.15.sdk - even though I have NOT updated the OS
 from Mojave!

 I tried uninstalling all ports and reinstalling them, but that didn't
 help. Ditto for simply creating a MacOSX10.14.sdk symlink. Does anyone
 have a suggestion on how to get around this problem?

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Ticket URL: <https://trac.macports.org/ticket/59088>
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