[GHC] #12673: bkpcabal01 testcase fails with spurious output on stderr on Darwin

[GHC]

#12673: bkpcabal01 testcase fails with spurious output on stderr on Darwin
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        Reporter:  bgamari           |                Owner:
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Package system    |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D2584
       Wiki Page:                    |
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Comment (by ezyang):

 This is actually a Cabal problem, see
 https://github.com/haskell/cabal/issues/2257

 It seems fairly harmless though.  Maybe we could put a symbol in
 `compileEmptyStub` to suppress the error?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12673#comment:2>
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