[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 svenpanne):

 It's totally irrelevant if it's easy to fix: The proposed change is
 completely surprising, unnatural and ad hoc. When you intend to break
 things, you'll better have a very good reason for doing so, and I don't
 think that this is the case here. It is the first time that I've heard
 that order-dependent flags are considered a problem, quite the opposite:
 Making them behave differently would confuse people and cause useless
 work. Later options override/modify previous options, that's how most
 commandline tools work.

 By all means, improve the documentation, but leave the flag processing as
 it is...

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10560#comment:11>
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