[GHC] #15889: ghc documentation doesn't explain difference between dwarf levels 1 2 and 3

[GHC]

#15889: ghc documentation doesn't explain difference between dwarf levels 1 2 and 3
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           Reporter:  carter         |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:  8.6.3
          Component:  Documentation  |           Version:  8.6.2
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 I tried digging into current ghc source  (well a 8.6.2 checkout) to track
 down where / how `debugLevel` crops up.

 The docs/examples  support g0 (off ) through g3. But when looking at where
 debugLevel appears in code, there isn't any different currently at the GHC
 layer for g3 vs g2! (is there a difference at the C compiler layer?)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15889>
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