[MacPorts] #38218: default optflags should be -Os rather than -O2

[MacPorts]

#38218: default optflags should be -Os rather than -O2
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  Reporter:  jeremyhu@…  |      Owner:  macports-tickets@…
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  base        |    Version:  2.1.3
Resolution:              |   Keywords:
      Port:              |
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Comment (by egall@…):

 I've had times where altering the optimization level would make my code
 fail to compile.  We should test to make sure this won't break anything
 before we go changing anything.

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Ticket URL: <https://trac.macports.org/ticket/38218#comment:1>
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