[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++
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  Reporter:  kencu   |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  base    |    Version:  2.6.2
Resolution:          |   Keywords:
      Port:          |
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Comment (by kencu):

 FYI in TigerPorts I have been fussing a bit about which gcc7 version to
 use.

 gcc7/libgcc7 7.5.0 is the current one in MacPorts, but it is ABI broken in
 places and causes segfaults on older systems that use it. To try to fix
 that, Marcus generated a wrapper for executables that show this error, but
 I use Tiger to make distributable applications like TenFourFox and I
 didn't want to use that wrapper all the time.

 So in TigerPorts I have held back the gcc7/libgcc7 version to 7.4.0, which
 is very capable, and still compatible with older systems. But sometimes I
 vacillate about being more compatible with the current MacPorts vs
 building a redistributable TenFourFox. I have not yet fully decided what
 to do about that problem.

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Ticket URL: <https://trac.macports.org/ticket/59584#comment:12>
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