[GHC] #13384: Windows build thinks sqrt (-1) == -1

[GHC]

#13384: Windows build thinks sqrt (-1) == -1
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        Reporter:  bgamari           |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect result  |  Unknown/Multiple
  at runtime                         |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 This is relevant: https://sourceforge.net/p/mingw/bugs/2337/

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13384#comment:2>
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