[GHC] #5082: Emit warnings when conflicting flags are supplied

[GHC]

#5082: Emit warnings when conflicting flags are supplied
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        Reporter:  ezyang            |            Owner:
            Type:  feature request   |           Status:  new
        Priority:  low               |        Milestone:  ⊥
       Component:  Compiler          |          Version:  7.1
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Changes (by ezyang):

 * priority:  normal => low
 * difficulty:   => Unknown


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/5082#comment:2>
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