------- Comment #3 from thomas at archlinux dot org 2010-05-04 23:06 ------- What is -fwrapv supposed to do? I don't see any changes in behaviour or compiler output.
As I said, I don't know exactly what to put into a test case (I didn't write any of the code that breaks), but I can try my best to find one. I first encountered this problem in gap (http://www.gap-system.org), and it was fixed by this patch: http://www.math.leidenuniv.nl/~wpalenst/sage/gap_gcc45_strict_aliasing.patch (look at the sysinfo.c part, that was what caused the problems apparently). I now encountered it again in busybox's 'sed' applet. I will try to take that code apart until I find out what's going wrong and hopefully produce a test case. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43987
