[MacPorts] #59584: macports-clang versions < 5.0 don't understand -stdlib=macports-libstdc++

[MacPorts]

#59584: macports-clang versions < 5.0 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):

 This shows up, for example, when trying to build `icu` on Intel versions
 of `Tiger` or `Leopard` configured to `libstdc++`. Base selects
 `clang-3.4` as a compiler, and then tries to pass it `-stdlib=macports-
 libstdc++` to satisfy the `compiler.cxx_standard 2011` directive, and that
 fails.

-- 
Ticket URL: <https://trac.macports.org/ticket/59584#comment:1>
MacPorts <https://www.macports.org/>
Ports system for macOS