[MacPorts] #53801: clang-4.0 @4.0.0 forces llvm-3.9 installation, with llvm-4.0 already installed.

[MacPorts]

#53801: clang-4.0 @4.0.0 forces llvm-3.9 installation, with llvm-4.0 already
installed.
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 Reporter:  ftpronk  |      Owner:
     Type:  defect   |     Status:  new
 Priority:  High     |  Milestone:
Component:  ports    |    Version:  2.4.1
 Keywords:           |       Port:
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 '''Steps to reproduce:'''

 Already installed (relevant) packages:
 - llvm-4.0 @4.0.0_0+polly (active)
 - llvm_select @2_0 (active)

 Installing clang-4.0 then requests the following packages:
 - ld64
 - ld64-latest
 - llvm-3.9

 '''Expected behaviour:'''
 - use llvm-4.0 instead of llvm-3.9

 '''Cause:'''

 ld64 has llvm-3.9 as dependency and does not recognise llvm-4.0

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Ticket URL: <https://trac.macports.org/ticket/53801>
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