[MacPorts] #54289: libcxx{,-abi} : upgrade + "runtime" variant

[MacPorts]

#54289: libcxx{,-abi} : upgrade + "runtime" variant
-------------------------------+----------------------
  Reporter:  RJVB              |      Owner:  jeremyhu
      Type:  update            |     Status:  assigned
  Priority:  Normal            |  Milestone:
 Component:  ports             |    Version:
Resolution:                    |   Keywords:  haspatch
      Port:  libcxxabi libcxx  |
-------------------------------+----------------------

Comment (by kencu):

 on the 10.5 intel machine, your best bet is to set the universal_archs in
 macports.conf to i386 + x86_64, like this:

 {{{
 universal_archs i386 x86_64
 }}}
 You should find, as I did, that works quite easily.
 {{{
 $ port -v installed libcxx
 The following ports are currently installed:
   libcxx @5.0.1_0+universal (active) platform='darwin 9' archs='i386
 x86_64' date='2017-12-29T13:56:55-0800'
 }}}


 ppc is another whole kettle of fish. Indeed, you cannot presently build
 `libclang_rt.osx.a` with a PPC slice very easily at all. I have been able
 to build it manually on a PPC machine using gcc6, and then move the PPC
 slice over and lipo it together with the intel slices.

 If clang / libcxx on PPC is your goal, I could use some help and
 inspiration!

--
Ticket URL: <https://trac.macports.org/ticket/54289#comment:7>
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