[MacPorts] #63360: libsdl2: fails to build due to unknown builtin '__builtin_bswap16'

[MacPorts]

#63360: libsdl2: fails to build due to unknown builtin '__builtin_bswap16'
----------------------+----------------------
  Reporter:  mrkapqa  |      Owner:  jmroot
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.7.1
Resolution:           |   Keywords:  lion
      Port:  libsdl2  |
----------------------+----------------------

Comment (by kencu):

 if you do this, it should work until he fixes it:
 {{{
 sudo port clean libsdl2
 sudo port install clang-9.0
 sudo port install libsdl2 configure.compiler=macports-clang-9.0
 }}}

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Ticket URL: <https://trac.macports.org/ticket/63360#comment:5>
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