[MacPorts] #51642: gcc49 @4.9.3: does not honor -march=native

[MacPorts]

#51642: gcc49 @4.9.3: does not honor -march=native
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  Reporter:  noloader  |      Owner:  macports-tickets@…
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.3.4
Resolution:            |   Keywords:
      Port:  gcc49     |
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Comment (by barracuda156):

 Several crypto-related ports fail for `x86_64` now on 10.6.8 when built
 with `gcc11` (`nettle`, `gnutls`, `nss`). So there is basically no
 solution for `gcc`?

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Ticket URL: <https://trac.macports.org/ticket/51642#comment:18>
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