[MacPorts] #62426: libc++: using a newer libc++ to build software on older macos systems

[MacPorts]

#62426: libc++: using a newer libc++ to build software on older macos systems
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  Reporter:  kencu                   |      Owner:  kencu
      Type:  enhancement             |     Status:  closed
  Priority:  Normal                  |  Milestone:
 Component:  ports                   |    Version:
Resolution:  fixed                   |   Keywords:
      Port:  libcxx macports-libcxx  |
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Comment (by kencu):

 That was a good find I thought, and I asked about that upstream. They felt
 that was not related to the  two libc++-versions-at-once issue, although
 I’m not so sure, myself. That is one of the reasons I never considered
 pushing libcxx past 7.0 though, at least not without significant testing.
 My ical crashes were on 10.7 w libcxx-5 and 7, so not affected by this.

 You can find these interactions in yhe libcxx-devel mailing list in 2019
 and 2020.

 There was a big push to modernize libcxx and lbcxxabi two or three years
 ago, and a lot of older system workarounds, etc, were being cut. It now
 only builds with a very current clang compiler, for example, only past two
 versions supported. I forget what the gcc promise is, something similar.

 They want to be able to move ahead without too much trailing baggage to
 support, which is fair enough.

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Ticket URL: <https://trac.macports.org/ticket/62426#comment:45>
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