[MacPorts] #51642: GCC does not honor -march=native

[MacPorts]

#51642: GCC does not honor -march=native
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  Reporter:  noloader@…  |      Owner:  macports-tickets@…
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.3.4
Resolution:              |   Keywords:
      Port:              |
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Comment (by ryandesign@…):

 Setting `CXX=/opt/local//bin/x86_64-apple-darwin12-gcc-4.9.3` is unusual.
 Usually, you would set `CXX=/opt/local/bin/g++-mp-4.9`. Have you tried
 that already? Does it change anything?

 Any particular reason you're using gcc 4.9.3? The latest stable version is
 6.1.0, available in the gcc6 port.

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Ticket URL: <https://trac.macports.org/ticket/51642#comment:2>
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