> Just out of curiosity - is there a technical reason why -O0 couldn't > be used in Linux kernel? I don't know, spinlocks would not work in this > case because it's how GCC was written or something. Or just nobody > compiles and tests kernel like this so it most likely would not work? > >> But why do you want to use a debugger on the kernel? That's not a >> normal task unless you are bringing up a new hardware platform. > > It's just something I always do when I learn new things. Trying to > figure out how to debug something in this new environment. No real task > so far. Hi, I also like figuring out what's happening in the OS underlying. So I have some ideas about reducing optimization. Although you couldn't turn off optimization completely, you can use both -O2 and other options to reducing optimization as far as possible. You can use -O2 -Q -v to find out which options are enabled when using -O2. Then you can try -O2 -fno-defer-pop -fno-thread-jumps etc. to disable some options. I once used this approach to debug kernel-2.4 in bochs simulator. Unfortunately, this approach could not counteract the effects of -O2 completely, but it's worth a try. Good Luck, Hao Lee _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
