Tina VanRoggen wrote: > tobj->SetParameter(4110, *(long *) &p1); http://mail-index.netbsd.org/tech-kern/2003/08/11/0001.html Just to be clear, this is a violation of the ISO C pointer aliasing rules. These rules were put in the standard to allow compilers to do a better job of optimizing, and here gcc 4.x is taking advantage of them where it did not in prior versions. It does not mean there is a bug in gcc, it means you need to fix your code to not use this construct (or the suboptimal solution of instructing gcc to relax its aliasing enforcement with -fno-strict-aliasing as mentioned already.) Brian
