[GHC] #4268: Warning for ANN pragmas when GHCi is not supported (was: Annotation extension needs a flag)

[GHC]

#4268: Warning for ANN pragmas when GHCi is not supported
-------------------------------+-------------------------------------------
        Reporter:  simonmar    |            Owner:
            Type:  bug         |           Status:  new
        Priority:  high        |        Milestone:  7.8.1
       Component:  Compiler    |          Version:  7.0.4
      Resolution:              |         Keywords:
Operating System:              |     Architecture:  Unknown/Multiple
  Unknown/Multiple             |       Difficulty:  Easy (less than 1 hour)
 Type of failure:  Other       |       Blocked By:
       Test Case:              |  Related Tickets:
        Blocking:              |
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Changes (by simonmar):

 * priority:  normal => high
 * milestone:  7.6.2 => 7.8.1


Comment:

 We don't want a flag for the ANN pragma, because pragmas don't normally
 have flags to enable them, they are unconditionally enabled.  However, ANN
 might not be supported if GHC is built without GHCi support (say on a
 platform that doesn't have GHCi support), so in those cases we want to
 emit a warning.

 Therefore this ticket is now for adding a warning when an ANN pragma is
 being ignored.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/4268#comment:10>
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