[MacPorts] #70733: gdb upgrade fails to build after selfupdate

[MacPorts]

#70733: gdb upgrade fails to build after selfupdate
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  Reporter:  TheLastLovemark  |      Owner:  (none)
      Type:  defect           |     Status:  new
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:  2.10.1
Resolution:                   |   Keywords:
      Port:  gdb              |
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Comment (by Randrianasulu):

 Also fails in 10.12.6
 {{{

 configure: error: *** A compiler with support for C++17 language features
 is required.
 }}}

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Ticket URL: <https://trac.macports.org/ticket/70733#comment:9>
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