[GHC] #7206: Implement cheap build

[GHC]

#7206: Implement cheap build
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              Reporter:  simonpj     |            Owner:  simonpj
                  Type:  bug         |           Status:  new
              Priority:  normal      |        Milestone:  ⊥
             Component:  Compiler    |          Version:  7.4.2
            Resolution:              |         Keywords:
      Operating System:              |     Architecture:  Unknown/Multiple
  Unknown/Multiple                   |       Difficulty:  Unknown
       Type of failure:              |       Blocked By:
  None/Unknown                       |  Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by simonpj):

 See also [http://www.haskell.org/pipermail/ghc-
 devs/2014-August/006147.html this thread].

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7206#comment:8>
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