On Mon, 2008-10-06 at 20:21 -0700, Don Stewart wrote:
magicloud.magiclouds:
Just a simple text process program. When I runhaskell it. I got:
GHCi runtime linker: fatal error: I found a duplicate definition for symbol fps_minimum whilst processing object file ~/.cabal/lib/bytestring-0.9.1.3/ghc-6.8.3/HSbytestring-0.9.1.3.o
Or try compiling it , with ghc --make
The reason is that while the Haskell code uses versioned linker symbols, the C code in the bytestring library does not. That means both versions define fps_minimum and a few other functions. The system linker does not care and just picks one. The GHCi linker is more picky and complains when two object files define the same linker symbol. That's why you get the problem with GHCi and not ghc --make. Duncan