[MacPorts] #61336: llvm-3.4 @3.4.2_13 does not build +universal: because dep libffi not installed +universal

[MacPorts]

#61336: llvm-3.4 @3.4.2_13 does not build +universal: because dep libffi not
installed +universal
-------------------------+----------------------
  Reporter:  ryandesign  |      Owner:  kencu
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  llvm-3.4    |
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Comment (by ryandesign):

 I wonder now if this is actually a bug in my lisaem port, which is the one
 that was trying to build when this failure was seen. lisaem calls
 `wxWidgets.use wxWidgets-2.8` in a variant. I don't think I appreciated
 that `wxWidgets.use wxWidgets-2.8` sets `supported_archs`, and it may be
 that `supported_archs` has to be set earlier, before variants are
 evaluated, to have the correct influence over whether dependencies use the
 universal variant or not. It's worth looking into anyway, and if it's not
 that, maybe something else about the wxWidgets-1.0 portgroup with which
 I'm not very familiar. I will try to figure it out.

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Ticket URL: <https://trac.macports.org/ticket/61336#comment:8>
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