[Haskell-cafe] Re: Cabal and linking with static libs (.a files)
simonmarhaskell at gmail.com
Fri Jun 9 11:22:18 EDT 2006
Ketil Malde wrote:
> (Reposted to café - my -libraries mail seems to have gotten lost along
> the way)
> I'm building an interface to a C library, which comes in the form of
> two .a files. I can't seem to get Cabal to link statically with
> these, so that the resulting package (libHSfoo-v.v.a) is self
> I've tried fiddling with Cabal's ld-options and extra-libraries, but
> so far with no success - loading my package either results in GHC
> looking for (and failing to find) .so files, or "unknown symbol".
A static library doesn't normally specify what it links to, that all
happens at link time. So if you say -optl-static when linking your
program, it won't have any dependencies on shared libraries.
What you actually want to do, I suspect, is to include verbatim copies
of the .a dependencies in your (binary) Cabal package, to make it
self-contained. Cabal doesn't have a way to do that at the moment. But
it's quite easy: just copy the .a files from /usr/lib (or wherever) and
put them in the same place as your libHSpackage.a.
> PS: did --user stop working (with GHC 20060607)? I'm adding --user to
> both 'configure' and 'install', but Cabal still wants to put things in
I don't think anything changed: --user never changed the install prefix,
it only ever changed where dependencies are found. To install in your
home dir, you also need to say --prefix=$HOME.
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