> I built quite a big library and turned it into a package. It
> works fine if
> use ghc -package gtk2 Blah.hs to compile things. But when I
> convert all
> the libraries to object files as described in the documentation, GHCi
> refuses to load the whole machinery:
>
> ~/source/mogul/fpDemo:$ ghci -package gtk2 Arabic.hs
> ___ ___ _
> / _ \ /\ /\/ __(_)
> / /_\// /_/ / / | | GHC Interactive, version 5.02.2,
> for Haskell
> 98.
> / /_\\/ __ / /___| | http://www.haskell.org/ghc/
> \____/\/ /_/\____/|_| Type :? for help.
>
> Loading package std ... linking ... done.
> Loading package lang ... linking ... done.
> Loading package gtk2 ...
>
> GHCi runtime linker: fatal error: I found a duplicate definition for
> symbol
> gcc2_compiled.
> whilst processing object file
> /home/as49/local/lib/gtk2hs/gtk2hs.o
I think this is due to a bug in GHCi's linker, which has been fixed post 5.02.2. I
tripped over it recently while trying to use Gtk+HS in GHCi on my RedHat 7.2 box.
There are two bugs tickled by gcc 2.96: our linker wasn't dealing with sections with
names other than the standard ones (.text, .data, .rodata) properly, and there was
also some infelicities in the local-symbol handling (Julian S. can tell you more).
The workaround I used is to compile up any .c files in your package *without* -O, and
without -g if you were also using that.
Cheers,
Simon
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