[Haskell-cafe] ghc 6.8.2 issue

Galchin, Vasili vigalchin at gmail.com
Tue Jun 3 01:04:26 EDT 2008


     By installing localling, I "runhaskell Setup.hs configure
--prefix=$HOME" plus add local path to LD_LIBRARY_PATH and LD_RUN_PATH? On
Linux, does ghc use .so's or is it linked statically?


On Mon, Jun 2, 2008 at 5:38 AM, Duncan Coutts <duncan.coutts at worc.ox.ac.uk>

> On Mon, 2008-06-02 at 00:07 -0500, Galchin, Vasili wrote:
> > Hello,
> >
> >       I have been developing new code for the "unix" package. I have
> > run into what I think are ghc 6.8.2 anomalies but couldn't see a
> > pattern. Possibly now I do. I have been using the 32-bit x86 ghc
> > binary that I downloaded from http://www.haskell.org and running on
> > Ubuntu Linux. I am pretty I can repeat now. Everything is ok until I
> > do "sudo runhaskell Setup.hs install" which installs a new "unix"
> > package that I just built. Of course the "intall" installs
> > into /usr/local/lib/unix- The "install" seems to
> > destroy some ghc compiler state under /usr/local ...
> That sounds right. You're replacing the unix- library that comes
> with ghc-6.8.2 with your own version. It is highly unlikely to be ABI
> compatible with the one you are replacing and so all the other packages
> that already depends on the existing unix- library end up broken.
> You'd expect this kind of breakage to be exposed as link errors and
> segfaults.
> I suggest you do not replace any of the libraries that come with ghc. To
> be more precise, it is perfectly ok to *add new versions* but it is not
> ok to *replace existing versions* without rebuilding all the other libs
> that depend on it.
> Make sense?
> So if you really want to make changes to the unix lib, make sure you
> change the version number too. I also suggest not installing the
> packages as root, just install them locally. That way you can guarantee
> you never mess up your ghc install. You would be able to revert to a
> clean ghc install just by removing your
> ~/.ghc/$arch/ghc-6.8.2/package.conf file which will unregister *all*
> locally registered packages. To unregister individual packages use
> ghc-pkg --user unregister $pkgname
> Duncan
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