[GHC] #9498: GHC links against unversioned .so files

[GHC]

#9498: GHC links against unversioned .so files
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        Reporter:  Kritzefitz        |                   Owner:  trommler
            Type:  feature request   |                  Status:  new
        Priority:  low               |               Milestone:
       Component:  Compiler (FFI)    |                 Version:  7.6.3
      Resolution:                    |                Keywords:  Debian
Operating System:  Linux             |            Architecture:
 Type of failure:  Other             |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Changes (by trommler):

 * owner:   => trommler


Comment:

 Replying to [comment:7 thomie]:
 > You're right!
 >
 > curl's cabal file would still contain `extra-libraries: curl`. But when
 installing curl, whoever decides the parameters for the ghc-pkg file
 (either cabal or ghc, I don't know at the moment) could ask the linker
 which version it actually found, and write `extra-libraries:
 :libcurl.so.<version>` to the ghc-pkg file.
 I think it is sufficient for GHCi to link against
 `libHScurl<something>.so` (the Haskell library) and omit `-lcurl` (the C
 library) from the `ld` command altogether. This would make the linking of
 dynamic libraries way more efficient as fewer shared libraries need to be
 opened and fewer symbol tables need to be read.

 See p 41 of Ulrich Drepper's "How To Write Shared Libraries"
 http://www.akkadia.org/drepper/dsohowto.pdf.

 I am going to look into this.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9498#comment:8>
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