On Fri, 23 Nov 2012, José Romildo Malaquias wrote:
When experimenting with the module LLVM.Core in GHCi on my gentoo linux system, I have got a fatal error:
$ ghci GHCi, version 7.6.1: http://www.haskell.org/ghc/ :? for help Loading package ghc-prim ... linking ... done. Loading package integer-gmp ... linking ... done. Loading package base ... linking ... done.
Prelude> :m + LLVM.Core
Prelude LLVM.Core> IntEQ Loading package llvm-base-3.0.1.0 ...
GHCi runtime linker: fatal error: I found a duplicate definition for symbol LLVMAddAlwaysInlinerPass whilst processing object file /usr/lib64/llvm/libLLVMipo.a This could be caused by: * Loading two different object files which export the same symbol * Specifying the same object file twice on the GHCi command line * An incorrect `package.conf' entry, causing some object to be loaded twice. GHCi cannot safely continue in this situation. Exiting now. Sorry.
There are problems with the configure procedure of llvm-base. The configure file fetches the llvm-base.buildinfo.in file and replaces the variables with informations for your system. The result ends up in ~/.ghc/your-ghc-version/package.conf.d/llvm-base-3.0.0.1-some-hash.conf You may post the content of this file for further diagnostics. You said earlier that you use a custom path for llvm. Maybe you have conflicts between two versions, one in /usr/lib and one in /usr/local/lib?