[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):

 I would even go further than Joachim in comment 3: I would open a ticket
 if the commandline arguments were *not* order-dependent, this is by far
 the most common way of doing things for lots of tools/compilers. I would
 even object to the idea of emitting a warning if something is overridden,
 even in the case of meta flags like -Ox (might be OK to enable the warning
 by another flag, but definitely not by default). Warnings are part of the
 "API" of a compiler, and I bet many automatic builds would be broken by
 such an ad-hoc change for no good reason.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10560#comment:6>
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