[MacPorts] #60698: mod_gnutls: error: use of unknown builtin '__builtin_add_overflow'

[MacPorts]

#60698: mod_gnutls: error: use of unknown builtin '__builtin_add_overflow'
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  Reporter:  ryandesign  |      Owner:  Schamschula
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.6.2
Resolution:              |   Keywords:  yosemite mavericks mountainlion
      Port:  mod_gnutls  |  lion
-------------------------+-------------------------------------------------

Comment (by Schamschula):

 The sqlite folks have run into the same issue. Their workaround actually
 goes in the other direction, i.e. don't blacklist any clang version:
 https://www.sqlite.org/src/info/8d3f485d86b2f2d8

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Ticket URL: <https://trac.macports.org/ticket/60698#comment:1>
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