[Haskell-cafe] Problem building with Cabal + TH + Library with FFI to C++ via C Wrapper

Ozgun Ataman ozataman at gmail.com
Tue Jun 28 21:19:40 CEST 2011

Dear Cafe,

I have recently run into a very annoying issue that I was not able to get
around. I have a local package that makes use of the snappy compression
library, which boasts bindings to C++ through a C wrapper.

Everything compiles fine with ghc --make, but cabal install hits a wall when
TemplateHaskell kicks in and decides to load the entire dependency chain.

Here is the important bit of the error message I get after running "cabal

Loading package snappy- ... linking ... ghc:
/home/ubuntu/.cabal/lib/snappy- unknown
symbol `_ZTV8BSSource'
ghc: unable to load package `snappy-'

I'm quite certain all the libs are in PATH. "cabal install snappy" installs
fine when typed separately by itself and everything works fine (the program
works, including compression via snappy) when I compile my local package
with ghc --make.

The problem only occurs on a Ubuntu 64-bit server, and I wasn't able to
replicate the issue on my local OS X box. On my local, cabal install works
just fine.

I did find a previous note on Cafe with the exact same problem, but no
solution was posted at the time:


Any help is much appreciated.

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.haskell.org/pipermail/haskell-cafe/attachments/20110628/e33fec46/attachment.htm>

More information about the Haskell-Cafe mailing list