[GHC] #15024: ghc: please switch to llvm-toolchain-6.0

[GHC]

#15024: ghc: please switch to llvm-toolchain-6.0
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        Reporter:  LocutusOfBorg     |                Owner:  (none)
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:  8.6.1
       Component:  Compiler          |              Version:  8.2.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by angerman):

 I've built 8.4 against llvm6. While it keeps emitting warnings, the built
 went through and building a simple Hello World application did work fine.
 I didn't have time to run validate just yet. And I won't until the end of
 the month as I'm stuck with a portable (slow) laptop until then.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15024#comment:2>
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