[GHC] #8123: GHCi warns about -eventlog even though it's sometimes necessary

[GHC]

#8123: GHCi warns about -eventlog even though it's sometimes necessary
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        Reporter:  akio              |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  GHCi              |                 Version:  7.6.3
      Resolution:                    |                Keywords:
Operating System:  Linux             |            Architecture:  x86_64
 Type of failure:  Incorrect         |  (amd64)
  warning at compile-time            |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Comment (by akio):

 Replying to [comment:3 rwbarton]:
 > akio, you seem to have something special about your environment
 (`DYNAMIC_BY_DEFAULT`?) I had to add `-dynamic` to the `ghc` invocations
 to reproduce.

 Oops, yes, I was using a `ghc` with `("GHC Dynamic","NO")`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8123#comment:4>
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