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

[MacPorts]

#38218: default configure.optflags should be -Os rather than -O2
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  Reporter:  jeremyhu@…   |      Owner:  macports-tickets@…
      Type:  enhancement  |     Status:  closed
  Priority:  Normal       |  Milestone:  MacPorts Future
 Component:  base         |    Version:  2.1.3
Resolution:  fixed        |   Keywords:
      Port:               |
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Comment (by jmr@…):

 Is that actually true for clang? The gcc man page has a more detailed
 explanation of what the optimisation levels do, and also mentions -Oz,
 which "enables other optimizations intended solely to reduce code size"
 and is "very similar to -Os in FSF distributions of GCC". Clang could be
 doing any combination of the things selected by either of these levels in
 GCC, or more.

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Ticket URL: <https://trac.macports.org/ticket/38218#comment:13>
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