[GHC] #10560: -f and -O options interact in non-obvious, order dependent ways

[GHC]

#10560: -f and -O options interact in non-obvious, order dependent ways
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        Reporter:  bgamari           |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.10.1
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  Incorrect         |  Unknown/Multiple
  warning at compile-time            |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Comment (by gidyn):

 If such a warning does actually break any builds, it will be immediately
 obvious why, and presumably easy to fix. The same cannot be said for
 someone trying to understand why GHC isn't behaving as expected because
 some flag silently undid the effect of an earlier flag.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10560#comment:10>
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