Hi,everyone http://www.redhat.com/archives/shrike-list/2003-April/msg00069.html http://fedoraproject.org/wiki/StackTraces http://old-en.opensuse.org/Packaging/Debuginfo This document said:"passing -g to gcc or g++". And "Note that the default CFLAGS and CXXFLAGS of the distro already contain -g, " My question is : I build souce code a.c with myself gcc/make configfile. first time: compile a.c with -O2,then get a1.bin second time: compile a.c woth -O2 -g,then strip debug symbols.then get a2.bin But i find a2.bin is slower then a1.bin.The performance of a2.bin is 5% slower. Should a2.bin run as fast as a1.bin?(performance is same?)//Tomorrow i will provide the complete commands. Can anyone give some advice? I find that:rpmbuild run gcc one time with -g -O2,then get a.rpm and a.debuginforpm.