[GHC] #10970: Built in MIN_VERSION macro support

[GHC]

#10970: Built in MIN_VERSION macro support
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           Reporter:  ezyang         |             Owner:
               Type:  feature        |            Status:  new
  request                            |
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  7.11
           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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 Pursuant to https://mail.haskell.org/pipermail/ghc-
 devs/2015-September/010015.html

 Recapped here: when preprocessing Haskell source code, we generate a
 temporary stub header file which defines a number of MIN_VERSION macros,
 ala what Cabal generates today.  Specifically, for every explicitly
 specified package dependency (via a `-package` or `-package-id` argument),
 we generate a `MIN_VERSION_pkgname` macro which tests for the version
 recorded for the package database.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10970>
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