[MacPorts] #59304: libffi blacklists all MacPorts compilers

[MacPorts]

#59304: libffi blacklists all MacPorts compilers
------------------------+--------------------
 Reporter:  ryandesign  |      Owner:  (none)
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.6.1
 Keywords:              |       Port:  libffi
------------------------+--------------------
 libffi blacklists all MacPorts compilers. Now that we default to a
 MacPorts clang compiler on older systems, this isn't workable, since it
 results in the message `Warning: All compilers are either blacklisted or
 unavailable; defaulting to first fallback option`.

 The [changeset:b2281df66f777bf51b9d5df7aec975ca0b5f14d1/macports-ports
 reason given for the blacklisting] is dependency cycles. Perhaps this
 needs investigation and a better solution found. Perhaps the
 clang_dependency portgroup will be involved in that solution.

-- 
Ticket URL: <https://trac.macports.org/ticket/59304>
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