[MacPorts] #57413: osmocore: error: invalid cpu feature string for builtin

[MacPorts]

#57413: osmocore: error: invalid cpu feature string for builtin
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  Reporter:  ryandesign  |      Owner:  michaelld
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  osmocore    |
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Comment (by michaelld):

 I have replicated this issue on 10.11 ... and it seems like only 10.11
 Xcode clang for some reason. No issues with 10.9, 10.10, or 10.12+; just
 10.11. Strange.

 The issue is that the compiler (/usr/bin/clang++) accepts the "-mssse3"
 (and "-mavx2") flag without erroring out, but doesn't in fact support
 compiling with those features enabled even if the hardware does support
 them. They use standard GNU Autotools calls, so they should work ... and,
 clearly they do for the most part; just not on 10.11's Xcode clang LOL.

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Ticket URL: <https://trac.macports.org/ticket/57413#comment:2>
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