[GHC] #9500: Allow GHC defaults to be modified with an environment variable

[GHC]

#9500: Allow GHC defaults to be modified with an environment variable
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              Reporter:  dfeuer      |            Owner:
                  Type:  feature     |           Status:  new
  request                            |        Milestone:
              Priority:  lowest      |          Version:  7.8.2
             Component:  Build       |         Keywords:
  System                             |     Architecture:  Unknown/Multiple
            Resolution:              |       Difficulty:  Easy (less than 1
      Operating System:              |  hour)
  Unknown/Multiple                   |       Blocked By:
       Type of failure:              |  Related Tickets:
  None/Unknown                       |
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Changes (by thomie):

 * component:  Compiler => Build System


Comment:

 Someone who understands the build system might be able to tell you.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9500#comment:4>
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