[MacPorts] #70341: g++ fails to compile when -libstd=libc++ is set

[MacPorts]

#70341: g++ fails to compile when -libstd=libc++ is set
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  Reporter:  mouse07410         |      Owner:  (none)
      Type:  defect             |     Status:  new
  Priority:  Normal             |  Milestone:
 Component:  ports              |    Version:
Resolution:                     |   Keywords:
      Port:  gcc12 gcc13 gcc14  |
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Comment (by cjones051073):

 yeah, hacking the headers like that was not the direction I was thinking
 of.

 I was more thinking we should first contact the GCC maintainers to find
 out what the level of support still is for libc++ in GCC. Is it still
 supported, and whatever level, or has interest died off. we also should
 find out if there is an 'officially' support set of headers we can use,
 rather than just guessing ourselves.

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Ticket URL: <https://trac.macports.org/ticket/70341#comment:9>
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