[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:  normal      |          Version:  7.8.2
             Component:  Compiler    |         Keywords:
            Resolution:              |     Architecture:  Unknown/Multiple
      Operating System:              |       Difficulty:  Easy (less than 1
  Unknown/Multiple                   |  hour)
       Type of failure:              |       Blocked By:
  None/Unknown                       |  Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by carter):

 Might be simpler to just patch NoFib to read off an ENV Var for additional
 flags, have you dug into doing that?  I'm happy to help you figure out a
 patch for that. Much simpler (and safer) than patching ghc to read off env
 vars always

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9500#comment:1>
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