[MacPorts] #53599: qt5-sqlite-plugin: not using the right compiler and thus breaks on libstdc++

[MacPorts]

#53599: qt5-sqlite-plugin: not using the right compiler and thus breaks on
libstdc++
--------------------------------+---------------------------------
  Reporter:  mojca              |      Owner:  MarcusCalhoun-Lopez
      Type:  defect             |     Status:  accepted
  Priority:  Normal             |  Milestone:
 Component:  ports              |    Version:
Resolution:                     |   Keywords:
      Port:  qt5-sqlite-plugin  |
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Comment (by mojca):

 Please look carefully.

 The compiler that complains is not `/opt/local/bin/clang++-mp-4.0`, but
 rather
 `/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++`.

 From what I understand that's the expected behaviour except that Xcode's
 clang++ should not be called at all.

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Ticket URL: <https://trac.macports.org/ticket/53599#comment:2>
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