[MacPorts] #64600: Is there any special reason why llvm-3.5 is deprecated while llvm-3.3 and llvm-3.4 are kept?

[MacPorts]

#64600: Is there any special reason why llvm-3.5 is deprecated while llvm-3.3 and
llvm-3.4 are kept?
-------------------------------------------+-------------------------------
  Reporter:  barracuda156                  |      Owner:  (none)
      Type:  update                        |     Status:  new
  Priority:  Normal                        |  Milestone:
 Component:  ports                         |    Version:  2.7.1
Resolution:                                |   Keywords:  powerpc, leopard,
      Port:  llvm-3.3, llvm-3.4, llvm-3.5  |  llvm
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Comment (by kencu):

 llvm-3.3, 3.4, 3.7, and 5.0 are currently required for bootstrapping to a
 modern clang/llvm like 9.0.

 the others are not, so were dropped.

 llvm/clangs 6, 7, 8, and maybe 10 are also ripe for being dropped soon…I
 had been waiting to see if Iain might finish one of them for PPC which is
 one reason I kept them, but nothing on that front after waiting two more
 years so … MacPorts could consider dropping them.

 having unneeded compilers hanging around causes a degree of confusion and
 generates many pointless tickets.

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Ticket URL: <https://trac.macports.org/ticket/64600#comment:1>
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