[Haskell-beginners] can run in ghci but can't compile.

[Anand Mitra]

Hi,

I can run the following program in the interpreter ghci but can't compile
it.

The program I am trying to compile is a simple copy using the lazy
bytestrings. I have been working out exercises from Real World haskell and I
was benchmarking this version which is supposed to be optimum.

,----
| import qualified  System  as S
| import qualified Data.ByteString.Lazy as L
|
| main = do
|   [from, to ] <- S.getArgs
|   file <- L.readFile from
|   L.writeFile to file
`----

While trying to compile this i get the following errors.

,----
| mitra at ravan:~/laptop/haskell/learn$ /opt/ghc-6.10.1/bin/ghc cp.hs
| cp.o: In function `sB1_info':
| (.text+0xab): undefined reference to
`bytestringzm0zi9zi1zi4_DataziByteStringziLazzy_writeFile_closure'
| cp.o: In function `sAW_info':
| (.text+0xe1): undefined reference to
`bytestringzm0zi9zi1zi4_DataziByteStringziLazzy_readFile_closure'
| cp.o: In function `sB5_info':
| (.text+0x30f): undefined reference to
`__stginit_bytestringzm0zi9zi1zi4_DataziByteStringziLazzy_'
| cp.o: In function `sB5_srt':
| (.data+0x4): undefined reference to
`bytestringzm0zi9zi1zi4_DataziByteStringziLazzy_readFile_closure'
| cp.o: In function `sB5_srt':
| (.data+0x8): undefined reference to
`bytestringzm0zi9zi1zi4_DataziByteStringziLazzy_writeFile_closure'
| collect2: ld returned 1 exit status
| mitra at ravan:~/laptop/haskell/learn$  rm cp.o
| mitra at ravan:~/laptop/haskell/learn$ /opt/ghc-6.10.1/bin/ghc cp.hs
| cp.o: In function `sB0_info':
| (.text+0xab): undefined reference to
`bytestringzm0zi9zi1zi4_DataziByteStringziLazzy_writeFile_closure'
| cp.o: In function `sAV_info':
`----

But this program is not syntactically or otherwise flawed since I can run it
under ghci.

,----
| mitra at ravan:~/laptop/haskell/learn$ /opt/ghc-6.10.1/bin/ghci
| GHCi, version 6.10.1: http://www.haskell.org/ghc/  :? for help
| Loading package ghc-prim ... linking ... done.
| Loading package integer ... linking ... done.
| Loading package base ... linking ... done.
| Prelude> :l cp.hs
| Ok, modules loaded: Main.
| Prelude Main> :main /etc/passwd /tmp/xyz
| Loading package bytestring-0.9.1.4 ... linking ... done.
| Loading package unix-2.3.1.0 ... linking ... done.
| Loading package filepath-1.1.0.1 ... linking ... done.
| Loading package old-locale-1.0.0.1 ... linking ... done.
| Loading package old-time-1.0.0.1 ... linking ... done.
| Loading package directory-1.0.0.2 ... linking ... done.
| Loading package process-1.0.1.0 ... linking ... done.
| Loading package syb ... linking ... done.
| Loading package array-0.2.0.0 ... linking ... done.
| Loading package random-1.0.0.1 ... linking ... done.
| Loading package haskell98 ... linking ... done.
| Prelude Main>
`----

Since I suspect that this might be a problem with the way I have installed
gch-6.10.1 I will explain how I have installed it.
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