[MacPorts] #55317: gmsh @2.8.4: error: read-only variable is not assignable (was: gmsh won't build with xcode 9.1)

[MacPorts]

#55317: gmsh @2.8.4: error: read-only variable is not assignable
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  Reporter:  dershow  |      Owner:
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:  xcode9
      Port:  gmsh     |
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Comment (by ryandesign):

 Confirmed with Xcode 9.0.1 on Sierra.

 Looks like the gmsh port hasn't been updated since 2014, and there have
 been many releases of gmsh since then. Maybe this issue would be fixed by
 updating the port to a newer version.

 Note that Xcode 8.3.3 is not meant to work with High Sierra. If it worked
 for compiling gmsh, great, but you shouldn't leave it selected because it
 will probably cause other ports to fail to build.

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Ticket URL: <https://trac.macports.org/ticket/55317#comment:4>
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