[GHC] #7563: Passing -C flag causes the 'impossible' to happen

[GHC]

#7563: Passing -C flag causes the 'impossible' to happen
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        Reporter:  jstolarek                     |         Owner:  igloo
            Type:  bug                           |        Status:  closed
        Priority:  normal                        |     Milestone:  7.8.1
       Component:  Driver                        |       Version:  7.7
      Resolution:  fixed                         |      Keywords:
Operating System:  Unknown/Multiple              |  Architecture:
 Type of failure:  Incorrect warning at          |  Unknown/Multiple
  compile-time                                   |     Test Case:  T7563
      Blocked By:                                |      Blocking:
 Related Tickets:                                |
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Comment (by Thomas Miedema <thomasmiedema@…>):

 In [changeset:"9e073ce41ff471d0b734ace095ece2a3e4c02f68/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="9e073ce41ff471d0b734ace095ece2a3e4c02f68"
 Explicitly check for -C on registerised build (#7563)

 Show a more descriptive error message.

 Reviewed By: austin

 Differential Revision: https://phabricator.haskell.org/D775
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7563#comment:4>
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