[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 request   |                  Status:  closed
        Priority:  lowest            |               Milestone:
       Component:  Build System      |                 Version:  7.8.2
      Resolution:  fixed             |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Changes (by thomie):

 * status:  new => closed
 * resolution:   => fixed


Comment:

 Replying to [comment:4 thomie]:
 > Someone who understands the build system might be able to tell you.
 That would be me now.

 The [https://ghc.haskell.org/trac/ghc/wiki/Building/RunningNoFib
 documentation] says to use `EXTRA_HC_OPTS`. I checked, and that should
 indeed work. Please reopen if it doesn't.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9500#comment:5>
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