[GHC] #8414: ghc-pkg prevents dynamic library only packages

[GHC]

#8414: ghc-pkg prevents dynamic library only packages
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       Reporter:  AndreasVoellmy    |             Owner:
           Type:  bug               |            Status:  new
       Priority:  normal            |         Milestone:
      Component:  ghc-pkg           |           Version:
       Keywords:                    |  Operating System:  Unknown/Multiple
   Architecture:  Unknown/Multiple  |   Type of failure:  Other
     Difficulty:  Unknown           |         Test Case:
     Blocked By:                    |          Blocking:
Related Tickets:                    |
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 GHC supports compiling Haskell libraries as dynamic libraries and building
 executables against dynamic libraries. GHCi seems to support loading
 modules from dynamic libraries, too. So it would seem that it should be
 possible to have packages that only include dynamic libraries, omitting
 the .a and .o files typically generated.

 cabal-install allows building dynamic libraries only, for example with the
 command "cabal install --disable-library-vanilla --enable-shared
 --disable-library-profiling". However, ghc-pkg register refuses to install
 the package without the .a files present.  This seems to be a bug with
 ghc-pkg.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8414>
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