[MacPorts] #59584: macports-clang versions <= 3.7 don't understand -stdlib=macports-libstdc++

[MacPorts]

#59584: macports-clang versions <= 3.7 don't understand -stdlib=macports-libstdc++
---------------------+--------------------
  Reporter:  kencu   |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  base    |    Version:  2.6.2
Resolution:          |   Keywords:
      Port:          |
---------------------+--------------------

Comment (by kencu):

 You will not get anywhere at present unless you use my TigerPorts repo.
 {{{
 $ port -v installed icu
 The following ports are currently installed:
   icu @65.1_1 (active) platform='darwin 8' archs='i386'
 date='2020-03-15T10:18:41-0700'
 }}}

 Then you do clang-3.4 -> libcxx -> clang-3.7 -> clang-5.0 -> clang-7.0.

 But it is not yet fully automated. I am gradually introducing the changes
 into MacPorts.

-- 
Ticket URL: <https://trac.macports.org/ticket/59584#comment:7>
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