[GHC] #8713: libdl, libpthread may be unwanted too

[GHC]

#8713: libdl, libpthread may be unwanted too
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       Reporter:  ip1981             |             Owner:
           Type:  bug                |            Status:  new
       Priority:  normal             |         Milestone:
      Component:  libraries/unix     |           Version:  7.6.3
       Keywords:                     |  Operating System:  Other
   Architecture:  x86_64 (amd64)     |   Type of failure:  GHC doesn't work
     Difficulty:  Moderate (less     |  at all
  than a day)                        |         Test Case:
     Blocked By:                     |          Blocking:
Related Tickets:                     |
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 I have GHC on an unusual system [1]

 libdl.so.1, librt.so.1 and some others are "filter libraries": they do not
 provide real functions (almost all is in libc.so.1), but to make thing
 work libFOO.so are GNU ld linker scripts: thus linking is successful,
 libFOO.so.1 is not linked in :-)

 Unfortunately, runtime linker (ld.so.1) does not understand GNU ld linker
 scripts. And I get errors like this:

 {{{
 # ghci -package unix
 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 package array-0.4.0.1 ... linking ... done.
 Loading package deepseq-1.3.0.1 ... linking ... done.
 Loading package bytestring-0.10.0.2 ... linking ... done.
 Loading package old-locale-1.0.0.5 ... linking ... done.
 Loading package time-1.4.0.1 ... linking ... done.
 Loading package unix-2.7.0.0 ... <command line>: can't load .so/.DLL for:
 /usr/lib/gcc/x86_64-pc-solaris2.11/4.7/../../../x86_64-illumos/libdl.so
 (ld.so.1: ghc: fatal: /usr/lib/gcc/x86_64-pc-
 solaris2.11/4.7/../../../x86_64-illumos/libdl.so: unknown file type)

 }}}

 The unix package v2.6 had the same issue with librt.so too, in version 2.7
 libdl.so remains.

 I use the attached patch for GHC 7.6.3 to fix this issue.

 In general I suggest to use AC_SEARCH_LIBS instead of AC_CHECK_LIB

 [1] http://osdyson.org

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8713>
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