[MacPorts] #56908: gdal @2.3.1: error: thread-local storage is not supported for the current target

[MacPorts]

#56908: gdal @2.3.1: error: thread-local storage is not supported for the current
target
-------------------------+-----------------------------------------
  Reporter:  ryandesign  |      Owner:  Veence
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:  mavericks yosemite haspatch
      Port:  gdal        |
-------------------------+-----------------------------------------

Comment (by ryandesign):

 I agree, and continue to recommend adding `compiler.blacklist-append
 {clang < 800}` to the Portfile.

 On 10.6 and earlier, thread-local storage can't be used for other reasons,
 so I would disable it there.

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Ticket URL: <https://trac.macports.org/ticket/56908#comment:4>
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