Haskell program with Data.Set doesnt compile
I write the following file temp.hs:
import qualified Data.Set
import System.Environment
main :: IO ()
main = do
args <- getArgs
let fname = head args
print (fname)
It loads in ghci without errors:
$ ghci
GHCi, version 6.12.3: http://www.haskell.org/ghc/ :? for help
Loading package ghc-prim ... linking ... done.
Loading package integer-gmp ... linking ... done.
Loading package base ... linking ... done.
Loading package ffi-1.0 ... linking ... done.
Prelude> :load temp.hs
[1 of 1] Compiling Main ( temp.hs, interpreted )
Ok, modules loaded: Main.
*Main>
When I try to compile it, I get the following errors:
$ ghc temp.hs -o temp
Undefined symbols:
"___stginit_containerszm0zi3zi0zi0_DataziSet_", referenced from:
___stginit_Main_ in temp.o
ld: symbol(s) not found
collect2: ld returned 1 exit status
If I take the import Data.Set out, it compiles fine.
Version Info:
$ ghc --version
The Glorious Glasgow Haskell Compilation System, version 6.12.3
$ gcc --ver
Using built-in specs.
Target: i686-apple-darwin10
Configured with: /var/tmp/gcc_40/gcc_40-5494~112/src/configure --disable-checking -enable-werror --prefix=/usr --mandir=/share/man --enable-languages=c,objc,c++,obj-c++ --program-transform-name=/^[cg][^.-]*$/s/$/-4.0/ --with-gxx-include-dir=/include/c++/4.0.0 --with-slibdir=/usr/lib --build=i686-apple-darwin10 --with-arch=apple --with-tune=generic --host=i686-apple-darwin10 --target=i686-apple-darwin10
Thread model: p开发者_JAVA技巧osix
gcc version 4.0.1 (Apple Inc. build 5494)
You can add packages individually (as KennyTM suggests), or you can just use --make
, which is much more convenient in a number of ways:
ghc --make temp.hs -o temp
This will cause GHC to look for any required modules among its installed packages in exactly the same way that GHCi does.
ghc -package containers temp.hs -o temp
You can check which package may be needed with ghci, when you actually use the library:
GHCi, version 6.12.3: http://www.haskell.org/ghc/ :? for help
Loading package ghc-prim ... linking ... done.
Loading package integer-gmp ... linking ... done.
Loading package base ... linking ... done.
Loading package ffi-1.0 ... linking ... done.
Ok, modules loaded: Main.
Prelude Main> Data.Set.singleton 0
> Loading package array-0.3.0.1 ... linking ... done.
> Loading package containers-0.3.0.0 ... linking ... done.
fromList [0]
Prelude Main>
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