[MacPorts] #55800: libvpx 1.7.0_0 build fails: error: passing 'int' to parameter of incompatible type '__m256i' (vector of 4 'long long' values)

[MacPorts]

#55800: libvpx 1.7.0_0 build fails: error: passing 'int' to parameter of
incompatible type '__m256i' (vector of 4 'long long' values)
----------------------------+-------------------
  Reporter:  laughingtiger  |      Owner:
      Type:  defect         |     Status:  new
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.4.2
Resolution:                 |   Keywords:
      Port:  libvpx         |
----------------------------+-------------------

Comment (by kencu):

 looks like the assembler in the version of clang included with darwin 15
 is too old to understand the new avx512 instructions in libvpx.

 It builds with clang-3.9 without any trouble.

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Ticket URL: <https://trac.macports.org/ticket/55800#comment:2>
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