[MacPorts] #58741: get clang 3.4 and 3.9 4.0 5.0"back"

[MacPorts]

#58741: get clang 3.4 and 3.9 4.0 5.0"back"
----------------------------------+--------------------
  Reporter:  rmottola             |      Owner:  (none)
      Type:  request              |     Status:  closed
  Priority:  Normal               |  Milestone:
 Component:  ports                |    Version:
Resolution:  wontfix              |   Keywords:
      Port:  clang-3.9 clang-4.0  |
----------------------------------+--------------------

Comment (by cjones051073):

 Obsoleting macports clang compilers is fine, I am in favour of removing
 old ones as possible, but before obsoleting the port you first need to
 remove reference to them in base. A number of them are used as fallbacks
 and this needs to be removed, *and* made available to users as a public
 release, *before* the port is declared obsolete. Macports clang 5.0 is a
 very common only used fallback, so please do not obsolete this one at
 least before removing all references to it in base. I recently had to do
 this for 3.9 and 4.0 in base, which should have been done before the ports
 themselves where declared as obsolete.

 https://github.com/macports/macports-base/pull/137

-- 
Ticket URL: <https://trac.macports.org/ticket/58741#comment:11>
MacPorts <https://www.macports.org/>
Ports system for macOS