Hi all A cursory look at Happstack.Crypto.MD5 shows it uses -fvia-c: {-# LANGUAGE BangPatterns #-} {-# OPTIONS_GHC -funbox-strict-fields -fvia-c -optc-funroll-all-loops -optc-O3 #-} -- -- Module : Happstack.Crypto.MD5 -- License : BSD3 ........ GHC (on Windows) comes with perl so it shouldn't need installing again. As an expedience, one could try removing the OPTIONS_GHC pragma to see if it compiles at least (there may be other modules that use fvia-c too). Best wishes Stephen

Manually removing -fvia-c solved it. Thanks On Wed, May 5, 2010 at 7:11 AM, Ivan Lazar Miljenovic wrote:

Stephen Tetley writes:

...

Hi all

A cursory look at Happstack.Crypto.MD5 shows it uses -fvia-c:

{-# LANGUAGE BangPatterns #-} {-# OPTIONS_GHC -funbox-strict-fields -fvia-c -optc-funroll-all-loops -optc-O3 #-}

I would hazard a guess that this is at an attempt to improve performance (I wouldn't know if it actually does or not though).

-- Ivan Lazar Miljenovic Ivan.Miljenovic@gmail.com IvanMiljenovic.wordpress.com _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe