Haskell package with dynamic library only

Andreas Voellmy andreas.voellmy
Sat Oct 5 16:33:26 UTC 2013

I filed a ticket for this issue: http://ghc.haskell.org/trac/ghc/ticket/8414


On Sat, Oct 5, 2013 at 11:56 AM, Andreas Voellmy
<andreas.voellmy at gmail.com>wrote:

> Christiaan suggested that I try cabal installing
> "--disable-library-vanilla" which I combined with --enable-shared. It
> almost works. It causes ghc to only create the dynamic libraries. However,
> ghc-pkg register fails with the error:
> /usr/local/bin/ghc-pkg update - --global --user
> --package-db=dist/package.conf.inplace
> cabal: TestLib- cannot find libHSTestLib- on library path
> (use --force to override)
> Failed to install TestLib-
> It seems that ghc-pkg thinks that we must have the .a files to register
> the package. (I scanned the ghc-pkg source and it looks like checkHSLib is
> where this check happens.)
> So, is the check in ghc-pkg really correct? I.e. the package would be
> unusable without the .a file? Or would this be OK, so we really should
> change ghc-pkg?
> -Andi
> On Fri, Oct 4, 2013 at 6:35 PM, Andreas Voellmy <andreas.voellmy at gmail.com
> > wrote:
>> Hi all,
>> Is it possible to have a Haskell package that only includes a dynamic
>> library and .dyn_hi files? I.e. it would omit the .o and .a files? I tried
>> building a library using cabal and --enable-shared. It still includes the
>> .o and .a files.
>> Will builds with "-dynamic" and loading modules in ghci work correctly if
>> I just delete the .o and .a files?  I did a few experiments and it seems to
>> work OK, although it seems that things break if I delete the .hi files,
>> even though I'd expect only the .dyn_hi files would be used.
>> -Andi
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