Haskell package with dynamic library only

Andreas Voellmy andreas.voellmy
Sat Oct 5 15:56:02 UTC 2013

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
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?


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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