[GHC] #3345: Support reading .a files in GHCi to reclaim some disk space

[GHC]

#3345: Support reading .a files in GHCi to reclaim some disk space
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    Reporter:  batterseapower    |        Owner:              
        Type:  feature request   |       Status:  new         
    Priority:  high              |    Milestone:  7.2.1       
   Component:  Compiler          |      Version:  6.10.2      
    Keywords:                    |     Testcase:              
   Blockedby:                    |   Difficulty:  Unknown     
          Os:  Unknown/Multiple  |     Blocking:              
Architecture:  Unknown/Multiple  |      Failure:  None/Unknown
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Comment(by simonmar):

 I suggest we make the GHCi .o files optional, on all platforms, and make
 the linker fall back to using the .a file if it can't find the .o file.
 Then we simply disable the .o file for the GHC package unconditionally,
 thus saving a lot of space in the binary distributions in exchange for a
 slower loading of the GHC package - a fair tradeoff I think.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3345#comment:4>
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