[MacPorts] #65555: py39-matplotlib is using libstdc++ (this installation is configured to use libc++)

[MacPorts]

#65555: py39-matplotlib is using libstdc++ (this installation is configured to use
libc++)
----------------------------+------------------------
  Reporter:  RobK88         |      Owner:  reneeotten
      Type:  defect         |     Status:  assigned
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.7.2
Resolution:                 |   Keywords:  lion
      Port:  py-matplotlib  |
----------------------------+------------------------

Comment (by kencu):

 I changed all the macports-clangs to choose the right stdlib, so you could
 just blacklist the xcode clangs for 10.8 and less to fix this via compiler
 blacklisting.

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Ticket URL: <https://trac.macports.org/ticket/65555#comment:9>
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