[GHC] #13091: Build broken on amd64 solaris 11

[GHC]

#13091: Build broken on amd64 solaris 11
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        Reporter:  kgardas           |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Build System      |              Version:  8.0.2
      Resolution:                    |             Keywords:
Operating System:  Solaris           |         Architecture:  x86_64
 Type of failure:  Building GHC      |  (amd64)
  failed                             |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 Presumably the `-m64` flag is assuming that the user will be using a gnu
 toolchain on Solaris. It seems like we should try to avoid breaking this
 possibility.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13091#comment:2>
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