[GHC] #8770: ghci dynamic loading on MacOSX assumes .dylib extension (should check .so also)

[GHC]

#8770: ghci dynamic loading on MacOSX assumes .dylib extension (should check .so
also)
-----------------------------------+---------------------------------
       Reporter:  z9p              |             Owner:
           Type:  bug              |            Status:  new
       Priority:  normal           |         Milestone:
      Component:  GHCi             |           Version:  7.6.3
       Keywords:  dlopen dylib so  |  Operating System:  MacOS X
   Architecture:  x86_64 (amd64)   |   Type of failure:  None/Unknown
     Difficulty:  Unknown          |         Test Case:
     Blocked By:                   |          Blocking:
Related Tickets:                   |
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 I am using ghc-7.6.3 on MacOSX 10.9.1.  I noticed that when -l foo option
 is specified to ghci, it assumes the shared library extension is .dylib
 and tries to load foo.dylib.  Even though a valid foo.so is present while
 foo.dylib is not, ghci ignores the .so and signals an error.  This is in
 contradiction to the behavior of gcc and python on MacOSX.  gcc would
 check the existence of both .so and .dylib  and try to link them.  Python
 is able to load the .so as well.  Notice that here the .so is simply a
 renamed Mach-O .dylib.

 The reason I raise this issue is, in my case, I use macports to install
 cern ROOT and its shared libraries are all installed as .so files under
 /opt/local/lib.  I would like to use them without change or creating
 .dylib -> .so links.

 $ ghci -lGui
 GHCi, version 7.6.3: http://www.haskell.org/ghc/  :? for help
 Loading package ghc-prim ... linking ... done.
 Loading package integer-gmp ... linking ... done.
 Loading package base ... linking ... done.
 Loading object (dynamic) Gui ... failed.
 <command line>: user specified .o/.so/.DLL could not be loaded
 (dlopen(libGui.dylib, 9): image not found)
 Whilst trying to load:  (dynamic) Gui
 Additional directories searched: (none)

 $ ln -s libGui.so libGui.dylib
 $ ghci -lGui
 GHCi, version 7.6.3: http://www.haskell.org/ghc/  :? for help
 Loading package ghc-prim ... linking ... done.
 Loading package integer-gmp ... linking ... done.
 Loading package base ... linking ... done.
 Loading object (dynamic) Gui ... done
 final link ... done
 Prelude>

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8770>
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