Simon Marlow writes:

Thu Mar 23 05:45:14 PST 2006 Simon Marlow * work around a gcc 4.1.0 codegen bug in -O2 by forcing -O1 for GHC.Show See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26824

I don't know if this helps, but newer gcc versions have -fwrapv option which makes signed arithmetic overflow well-defined. -- __("< Marcin Kowalczyk \__/ qrczak@knm.org.pl ^^ http://qrnik.knm.org.pl/~qrczak/