[MacPorts] #56941: cmake @3.12.0_0 and gcc7 @7.3.0_3 don't work well together

[MacPorts]

#56941: cmake @3.12.0_0 and gcc7 @7.3.0_3 don't work well together
-------------------------+-----------------------
  Reporter:  iqgrande    |      Owner:  michaelld
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.5.3
Resolution:              |   Keywords:
      Port:  cmake, gcc  |
-------------------------+-----------------------

Comment (by michaelld):

 Yeah I think @iqgrande is onto something.

 OK so it looks like `/usr/local/bin/` has in it: VirtualBox && GhostScript
 stuff. that's probably fine.

 The `as` being used is part of `cctools`, which you have installed as
 `+llvm40`. The default is `+llvm39`. Not sure if that makes a difference.

 Can you try the following:
 {{{
 sudo port install cctools
 }}}
 and, assuming that actually works (meaning, it installs the `+llvm39`
 version), then retry all of the various `CC=...` and related commands &
 see if it works.

-- 
Ticket URL: <https://trac.macports.org/ticket/56941#comment:14>
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