[GHC] #3372: Allow for multiple linker instances

[GHC]

#3372: Allow for multiple linker instances
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        Reporter:  jcpetruzza        |                Owner:  (none)
            Type:  feature request   |               Status:  new
        Priority:  low               |            Milestone:
       Component:  Runtime System    |              Version:
  (Linker)                           |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:  3658              |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonmar):

 This is not fixed. The C API for the linker in the runtime was made
 thread-safe, so that multiple C clients could call it simultaneously, but
 GHC still has a single global instance of its own linker state.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/3372#comment:19>
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