[MacPorts] #47754: vigra @1.10.0_6 build fails with -Os

[MacPorts]

#47754: vigra @1.10.0_6 build fails with -Os
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  Reporter:  macports@…  |      Owner:  benjamin.seppke@…
      Type:  defect      |     Status:  closed
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.3.3
Resolution:  fixed       |   Keywords:
      Port:  vigra       |
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Comment (by benjamin.seppke@…):

 It really is the compiler's optimization flag, which causes this error. I
 didn't report this behaviour upstream (either LLVM or CLang) since I
 didn't have any more time e.g. to find/generate a minimal error case.
 Moreover, I'm not even sure, if this error is solely caused by the VIGRA
 library because the error just occured with a new version of hdf5.

 So, if anyone has the time and capabilities to get deeper into this
 problem, feel invited :). But also be prepared that the error may
 - either be caused by VIGRA's hdf5 impex or
 - by the new hdf5 lib or
 - somewhere in between.
 And that it may take you a lot of time to generate a minimal error raising
 file.

 But it is surely linked to the compiler settings - and vanishes if you got
 to -O3. I also did some "google" research on this issue (libc++ and
 optimization level) but did not find anything comparable.

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Ticket URL: <https://trac.macports.org/ticket/47754#comment:13>
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