[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    |           Version:  7.11
  (LLVM)                             |  Operating System:  Unknown/Multiple
              Keywords:              |   Type of failure:  None/Unknown
          Architecture:              |        Blocked By:
  Unknown/Multiple                   |   Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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 Since it has become more widely know that the LLVM developers often make
 breaking changes to the IR language between releases, some Linu
 distributions (eg Debain and hence Ubuntu) have started doing multi-
 version LLVM installs.

 For instance on Debian, the llvm-3.6 programs are installed in
 `/usr/lib/llvm-3.6/bin` as `llc` and `opt`.

 I propose that the `configure.ac` and `aclocal.m4` configuration goop be
 modified to look for `llc` and `opt` in these versioned
 `/usr/lib/llvm-X.Y` locations. I'm also willing to do the hard yards on
 implementing this if people think its a good idea.

 This can be seen as a step along the way to more stringent LLVM versioning
 requirements.

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