[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 request   |               Status:  new
        Priority:  normal            |            Milestone:  8.0.1
       Component:  Compiler          |              Version:  7.11
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D1349
       Wiki Page:                    |
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Comment (by rwbarton):

 I made a header file with 100000 copies (with different names) of the two
 macros generated per package, and ran a file that `#include`s it through
 cpp. It took 0.27 seconds. So for a more realistic package database size
 of 1000 packages, that's 2 milliseconds. I think that overhead is
 negligible relative to the time it takes ghc to compile any module.

 Not critical to fix this for 8.0 though, since it's just a convenience
 feature request.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10970#comment:8>
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