[MacPorts] #48471: FSF gcc48 fails to compile projects on El Capitan due to OS X SDK bug in Availability.h

[MacPorts]

#48471: FSF gcc48 fails to compile projects on El Capitan due to OS X SDK bug in
Availability.h
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  Reporter:  jasonw@…  |      Owner:  macports-tickets@…
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.3.3
Resolution:            |   Keywords:  elcapitan haspatch
      Port:  gcc48     |
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Comment (by ryandesign):

 Replying to [comment:114 mf2k]:
 > Is this ticket still relevant? It builds on the El Capitan buildbot.

 [comment:107 Jeremy said] the fix is in the Xcode 7.3 version of the
 command line tools. That's what we use on the El Capitan buildbot.

 We could add the xcodeversions portgroup to the gcc48 port (and any other
 affected gcc ports?) and use it to require Xcode 7.3 or later on El
 Capitan. It wouldn't help users who have Xcode 7.3 but not the Xcode 7.3
 version of the command line tools (we never developed a way to test the
 version of the command line tools), but it might be better than nothing.

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Ticket URL: <https://trac.macports.org/ticket/48471#comment:115>
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