[MacPorts] #63453: libffi @3.4.2_0 does not tell port gcc7 (and possibly libgcc7?) need to be rebuilt

[MacPorts]

#63453: libffi @3.4.2_0 does not tell port gcc7 (and possibly libgcc7?) need to be
rebuilt
------------------------+---------------------
  Reporter:  ballapete  |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:  leopard
      Port:  libffi     |
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Comment (by ballapete):

 Replying to [comment:2 kencu]:
 >
 > Looks to me like the first thing that needs to be working is llvm-3.4,
 so your linker works again. I would do that first, therefore:
 > {{{
 > sudo port -f uninstall llvm-3.4
 > sudo port -v install llvm-3.4
 > }}}
 >
 I want GNU Emacs to work again (building it with GCC7). In it `port` might
 compile for days and weeks…

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Ticket URL: <https://trac.macports.org/ticket/63453#comment:4>
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