[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 thomie):

 > I think that FIND_LLVM macro will need to grow, not disappear.

 In `configure.ac`, can't you just replace:
 {{{
 FIND_LLVM_PROG([LLC], [llc], [llc])
 }}}
 With:
 {{{
 FP_ARG_WITH_PATH_GNU_PROG_OPTIONAL_NOTARGET([LLC], [llc], [llc-3.6])
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10170#comment:8>
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