[MacPorts] #45091: Adding HHVM Portfile

[MacPorts]

#45091: Adding HHVM Portfile
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  Reporter:  cornelius.howl@…  |      Owner:  macports-tickets@…
      Type:  submission        |     Status:  new
  Priority:  Normal            |  Milestone:
 Component:  ports             |    Version:  2.3.1
Resolution:                    |   Keywords:
      Port:  hhvm              |
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Comment (by larryv@…):

 Replying to [comment:6 cornelius.howl@…]:
 > External libraries built by clang are compatible with gcc48 binary.
 > (all my other libraries were built with clang)

 They are binary-compatible but will use different C++ runtimes (clang++
 uses libc++ abi, g++ uses libsupc++) and thus cannot be mixed. Doing so
 might appear to work at build time but will manifest at runtime in subtle
 but unpleasant ways.

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Ticket URL: <https://trac.macports.org/ticket/45091#comment:7>
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