senda <senda(a)ic.rdc.ricoh.co.jp&gt; writes: This looks very much like a compiler bug. Egcs is pretty stable within bounds on many platforms, I've compiled most of my development system with Egcs/Pgcc of various versions. The usual method is to read the documentation to find out what optimizations are enabled between -O and -O2 and rebuilding with a certain optimization disabled until you find the specific option that makes `gcc -g -O' work and `gcc -g -O -f<Some-Optimization>' not work. Further help in this area is beyond the scope of xemacs-beta, I urge you to seek help with the Egcs folks. You could try upgrading to Egcs-1.0.3a and see if that helps. I don't know offhand whether any Sparc changes made it, I think egcs-1.0.2 -> 1.0.3 was all Linux/ix86 changes. For whatever it's worth, even on Intel/Linux I found Egcs/Pgcc-1.02 to be pretty stable at -O6 if the -fno-risc and -fno-peep-spills options were also specified.