[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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Changes (by akio):

 * status:  infoneeded => new


Comment:

 Here is a test session (with GHC 7.10.1):

 {{{
 % cat Test.hs
 main = return ()
 % ghc -c -eventlog Test.hs
 % ghci Test.hs
 GHCi, version 7.10.1.1: http://www.haskell.org/ghc/  :? for help
 [1 of 1] Compiling Main             ( Test.hs, interpreted ) [flags
 changed]
 Ok, modules loaded: Main.
 *Main>
 Leaving GHCi.
 % ghci Test.hs -eventlog
 GHCi, version 7.10.1.1: http://www.haskell.org/ghc/  :? for help
 Warning: -debug, -threaded and -ticky are ignored by GHCi
 Ok, modules loaded: Main.
 Prelude Main>
 Leaving GHCi.
 }}}

 So GHCi decides to re-use the object file only when it's given
 `-eventlog`. Perhaps the recompilation checker should ignore this flag, if
 the flag doesn't actually affect how a module is compiled?

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8123#comment:2>
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