[GHC] #12748: BFD linker issue with GHCi

[GHC]

#12748: BFD linker issue with GHCi
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        Reporter:  hsyl20            |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
  (Linking)                          |             Keywords:
      Resolution:                    |  bfd,linker,ghci
Operating System:  Linux             |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  GHCi crash        |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 Indeed the `Typeable` implementation was changed as a result of #9858. We
 were slightly concerned that resolving this issue would regress
 compilation times, although initial indications seemed to suggest that the
 issue wouldn't be noticeable in practice.

 It sounds like BFD `ld` is likely doing something very silly (which
 wouldn't be at all surprising). I'm not really sure what to recommend in
 the short term beyond "use `gold`". In general `gold` is significantly
 more sane.

 In the long-term there is of course the question of whether we want to
 revert to the previous approach of producing `Typeable` bindings during
 evidence generation. Given that such massive types aren't terribly common,
 I tend to think that the consistency that treating `Typeable` at
 declaration-time is probably worth the cost.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12748#comment:4>
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