[GHC] #8420: Spurious dynamic library dependencies

[GHC]

#8420: Spurious dynamic library dependencies
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        Reporter:  AndreasVoellmy  |            Owner:
            Type:  bug             |           Status:  new
        Priority:  normal          |        Milestone:
       Component:  Compiler        |          Version:  7.6.3
      Resolution:                  |         Keywords:
Operating System:  MacOS X         |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown    |       Difficulty:  Unknown
       Test Case:                  |       Blocked By:
        Blocking:                  |  Related Tickets:
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Comment (by nomeata):

 I also noticed the problem; we’d like to generate our Debian package
 dependencies based on what files are linked, but currently that is an
 over-approximation. I.e. lots of stuff links to libgmp.

 I believe Ubuntu and OpenSUSE patch their build to use `-Wl,--as-needed`,
 but I refrained from it, to prevent unnecessary divergence. But I would
 very much welcome if GHC would build with `-as-needed`, preferably already
 in GHc-7.8 (as now we build `libHS*.so` files by default for all
 packages).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8420#comment:2>
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