[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
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |
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 Example:

 {{{
 ezyang at sabre:~$ rm B.hi
 ezyang at sabre:~$ Dev/ghc-7.10.2/usr/bin/ghc -c B.hs
 ezyang at sabre:~$ Dev/ghc-7.10.2/usr/bin/ghc -c B.hs -O
 compilation IS NOT required
 }}}

 Pretty minor, but would be nice to have fixed.

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