[GHC] #10923: GHC should recompile if flags change

[GHC]

#10923: GHC should recompile if flags change
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        Reporter:  ezyang            |                Owner:
            Type:  bug               |               Status:  new
        Priority:  low               |            Milestone:
       Component:  Compiler          |              Version:  7.10.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by ezyang):

 I am sure that there are some people who are using the old behavior. Maybe
 there needs to be a flag flipping between the two behaviors.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10923#comment:2>
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