[GHC] #10352: Properly link Haskell shared libs on all systems

[GHC]

#10352: Properly link Haskell shared libs on all systems
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        Reporter:  duncan            |                Owner:  Phyx-
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  7.11
  (Linking)                          |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:  5987
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Phyx-):

 It turns out that this is slightly tricky on Linux as well. It seems that
 the `WRAPPER` scripts generated by `utils/ghc-cabal/Main.hs` is also
 setting the `LD_LIBRARY_PATH` value to each dependency of the wrapped
 application.

 Previously for the RTS this was easy because all of the `RTS .so` were all
 in the same folder so it hardcoded `lib/ghc-${ver}/rts-1.0/` in the
 `LD_LIBRARY_PATH`.

 This presents the obvious question now, what to do with the RTS.
 Previously because the names were different and they're all in the same
 subdirectory you could just add the parent and the platform loaded would
 load the .so based on the filename.

 The problem is, I have no way of telling, from within the compiled program
 which RTS you actually intended to use. If I can't do that I can't add the
 new rts directories to the library path.

 Any suggestions?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10352#comment:19>
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