[GHC] #8301: error BaseReg must be in a register for THREADED_RTS

[GHC]

#8301: error BaseReg must be in a register for THREADED_RTS
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        Reporter:  erikd                |            Owner:  simonmar
            Type:  bug                  |           Status:  new
        Priority:  high                 |        Milestone:  7.8.1
       Component:  Compiler             |          Version:  7.7
      Resolution:                       |         Keywords:
Operating System:  Linux                |     Architecture:  powerpc64
 Type of failure:  Building GHC failed  |       Difficulty:  Unknown
       Test Case:                       |       Blocked By:
        Blocking:                       |  Related Tickets:
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Comment (by simonmar):

 So the problem seems to be that `NOSMP` isn't defined when we're compiling
 a `.hc` file from GHC.  But what I don't understand is why this only just
 started happening for you - I can't see any mechanism by which `NOSMP` is
 supposed to get defined, or any recent change that may have broken this.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8301#comment:11>
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