[MacPorts] #55444: clang-3.8 and later: All compilers are either blacklisted or unavailable

[MacPorts]

#55444: clang-3.8 and later: All compilers are either blacklisted or unavailable
-------------------------------------+-------------------------------------
 Reporter:  ryandesign               |      Owner:  jeremyhu
     Type:  defect                   |     Status:  new
 Priority:  Normal                   |  Milestone:
Component:  ports                    |    Version:
 Keywords:  leopard snowleopard      |       Port:  clang-3.8 clang-3.9
  lion mountainlion                  |  clang-4.0 clang-5.0 clang-devel
-------------------------------------+-------------------------------------
 clang 3.8 and later cannot be compiled on 10.8 (without
 LibcxxOnOlderSystems).

 {{{
 $ port info --name --version clang-{3.7,3.8,3.9,4.0,5.0,devel}
 version: 3.7.1
 name: clang-3.7
 --
 Warning: All compilers are either blacklisted or unavailable; defaulting
 to first fallback option
 version: 3.8.1
 name: clang-3.8
 --
 Warning: All compilers are either blacklisted or unavailable; defaulting
 to first fallback option
 version: 3.9.1
 name: clang-3.9
 --
 Warning: All compilers are either blacklisted or unavailable; defaulting
 to first fallback option
 version: 4.0.1
 name: clang-4.0
 --
 Warning: All compilers are either blacklisted or unavailable; defaulting
 to first fallback option
 version: 5.0.0
 name: clang-5.0
 --
 Warning: All compilers are either blacklisted or unavailable; defaulting
 to first fallback option
 version: devel-r319156
 name: clang-devel
 }}}

 Could clang-3.7 be added to `compiler.fallback` to accommodate this?

 I know you've been maintaining the fallback list in MacPorts base, so
 maybe you can think about whether it would be reasonable to add clang-3.7
 to the fallback in base, or whether it should go individually into each of
 those clang ports.

--
Ticket URL: <https://trac.macports.org/ticket/55444>
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