[MacPorts] #54504: xorg-server 1.18.4_2: fails to compile on siera

[MacPorts]

#54504: xorg-server 1.18.4_2: fails to compile on siera
--------------------------+--------------------------------
  Reporter:  EdHarry      |      Owner:
      Type:  defect       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.4.1
Resolution:               |   Keywords:  xorg-server sierra
      Port:  xorg-server  |
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Comment (by michaellass):

 It compiles fine using clang 3.9 but you will probably face this issue
 again:
 https://trac.macports.org/ticket/53910

 The fix for clang linked below didn't make it into clang 3.9 as far as I
 can see. This is why this version is also blacklisted in the Portfile.
 https://bugs.llvm.org/show_bug.cgi?id=30346

 Right now I am not sure how xorg-server can be built without this issue
 using compilers that are readily available in macports.

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Ticket URL: <https://trac.macports.org/ticket/54504#comment:4>
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