[GHC] #10458: GHCi fails to load shared object (the 'impossible' happened)

[GHC]

#10458: GHCi fails to load shared object (the 'impossible' happened)
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        Reporter:  rleslie       |                   Owner:
            Type:  bug           |                  Status:  new
        Priority:  normal        |               Milestone:  7.10.2
       Component:  GHCi          |                 Version:  7.10.1
      Resolution:                |                Keywords:
Operating System:  Linux         |            Architecture:  x86_64 (amd64)
 Type of failure:  None/Unknown  |               Test Case:
      Blocked By:                |                Blocking:
 Related Tickets:                |  Differential Revisions:
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Comment (by trommler):

 Replying to [comment:5 rwbarton]:
 > I'm a little worried about whether the obvious fix for this (adding
 `-lfoo` to the gcc command line for building the temporary shared objects
 for each library `-lfoo` specified on the ghci command line) might cause
 #8935 to occur again in some configurations. If we add every library that
 we've loaded there then what was the point of loading the libraries with
 RTLD_LOCAL?
 We need RTLD_LOCAL when we want to override symbols in a shared library
 previously loaded with symbols from a shared library loaded later. Given
 that we do not want to override symbols from C libraries, we can add them
 to the link command.

 My understanding of what we want to be able to override is very hazy. Do
 we have a wiki page that describes the semantics of loading packages and
 libraries into ghci?
 > Possibly we only need to use RTLD_LOCAL when building the ghci linker
 statically? Then we could revert the other changes like #10322 and #10110
 and #10058.
 What does it mean "building the ghci linker statically"?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10458#comment:8>
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