[Haskell-cafe] -f flag to runghc broken, or is it just me? (because trying switch elegantly between ghc 6.6 and ghc 6.7)

Thomas Hartman thomas.hartman at db.com
Wed Aug 22 13:38:39 EDT 2007

I'm doing a lot of switching between ghc 6.6 and ghc 6.7 on the same 
computer. I install modules using

  $ runghc Setup.hs configure 

I would like to specify which version of ghc should be getting the package 
installed via the f flag to runghc

  runghc: syntax: runghc [-f GHCPATH] [GHC-ARGS] FILE ARG...

but this appears to be broken.

  arghandling-nice.hs: args length does not equal 3. args: : []
  usage example: $ runghc arghandling-nice.hs firstarg secondarg thirdarg

without the flag works but 

-f /usr/local/bin/ghc-6.6.1  arghandling-nice.hs

does nothing.

-l /usr/local/bin/ghc-6.6.1
-rwxr-xr-x 1 root root 151 2007-06-16 20:22 /usr/local/bin/ghc-6.6.1

In general I don't like using runghc because it doesn't appear to be 
documented anywhere except that (incorrect?) usage message. Is there a way 
to do a package install just using ghc -e? (Sure I could compile, but it 
helps me sometimes if I can not, a la runghc.) At any rate I couldn't 
figure out how to pass arguments to main via ghc -e.

  import System

  main = do args <- getArgs
          let usagemsg = "usage example: $ runghc arghandling-nice.hs 
firstarg secondarg thirdarg"
          case args of
            [first,second,third] -> process first second third
            _                    -> error $ "args length does not equal 3. 
args: : " ++ ( show args ) ++ "\n" ++ usagemsg

  process a b c = print $ unwords [a,b,c]

Thanks for anybody who can help me out with this.



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