[GHC] #10170: Find versioned versions of LLVM tools

[GHC]

#10170: Find versioned versions of LLVM tools
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        Reporter:  erikd             |                   Owner:  erikd
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:  7.12.1
       Component:  Compiler (LLVM)   |                 Version:  7.11
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Comment (by erikd):

 @thomie It doesn't work now, because on my machine it picks `/usr/bin/llc`
 (which is actually a symlink to `/usr/lib/llvm-3.5/bin/llc`) before it
 picks `/usr/lib/llvm-3.6/bin/llc`. I can't remove llvm-3.5 because I have
 other tools that rely on it.

 If people think its a good idea, I would make the configure script check
 for a specific version of the llvm tools (currently 3.6 because thats all
 that seems to work currently). With this versioned check, when we move to
 another version of LLVM there should be one single change to configure.ac
 to make it check for the new version.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10170#comment:2>
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