[MacPorts] #67922: macports-libcxx does not support +universal on Intel?

[MacPorts]

#67922: macports-libcxx does not support +universal on Intel?
------------------------------+----------------------
  Reporter:  barracuda156     |      Owner:  kencu
      Type:  defect           |     Status:  assigned
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:  2.8.1
Resolution:                   |   Keywords:
      Port:  macports-libcxx  |
------------------------------+----------------------

Comment (by kencu):

 It was expedient to just copy the already-built lib++ out of clang-11
 rather than rebuild it, but as the Portfile says

 “
 # for now, we will leverage the already-built libc++ in the appropriate
 clang port
 # later, we can build this independently if we choose to do so, much like
 libtapi
 “

 It’s easy enough to rebuilt all of the desired clang and then copy the
 libc++ out of it.

 Slightly more complicated would be to set up a new build that only
 installs libc++… for the universal build of that, Apple uses a shell
 script. One of the Apple engineers showed my where it was on time… let me
 see if I can find it for you…

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Ticket URL: <https://trac.macports.org/ticket/67922#comment:2>
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