[MacPorts] #38289: rust @0.5: upstream only supports newer compilers

[MacPorts]

#38289: rust @0.5: upstream only supports newer compilers
----------------------+--------------------
 Reporter:  larryv@…  |      Owner:  g5pw@…
     Type:  defect    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:  2.1.3
 Keywords:            |       Port:  rust
----------------------+--------------------
 Originally reported in #38279.

 The [http://static.rust-lang.org/doc/0.5/tutorial.html#getting-started
 Rust Language Tutorial] claims that compilation requires GCC 4.4 or newer
 or Clang 3.0 or newer. I’m not sure whether it’s best to
 blacklist/whitelist compilers based on that documentation, or to just let
 it be until people start reporting failures. That’s up to you, I guess.

 One thorn is that Apple’s Clang doesn’t report version numbers like trunk
 Clang does. So we can’t just blacklist anything “older” than Clang 3.0;
 the compiler_blacklist_versions PortGroup filters on Clang build number
 (e.g., 425.0.24).

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Ticket URL: <https://trac.macports.org/ticket/38289>
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