[GHC] #12379: WARN pragma gives warning `warning: [-Wdeprecations]'

[GHC]

#12379: WARN pragma gives warning `warning: [-Wdeprecations]'
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        Reporter:  zilinc            |                Owner:
            Type:  bug               |               Status:  new
        Priority:  low               |            Milestone:
       Component:  Documentation     |              Version:  8.0.1
      Resolution:                    |             Keywords:  newcomer
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Documentation     |  Unknown/Multiple
  bug                                |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by tmcgilchrist):

 Just checking my understanding of what needs to be done here.

 Do I simply change the occurrences of `ghc-flag:: -Wwarnings-deprecations`
 with `ghc-flag:: -Wwarn-warnings-deprecations`?

 Are there docs on how to build the things under `doc/users_guide`? When I
 do a make from the top level it seems to be just building the compiler.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12379#comment:3>
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