On Mon, Mar 21, 2016 at 5:51 PM, Nicholas Mc Guire <der.herr@xxxxxxx> wrote: > You can not turn it off in all functions as some need particluar > optimization flags to comile at all, but you can pass > individual CFLAGS per file via the Makefile > > CFLAGS_target.o = -O0 or -flags-to-use > > aswell as remove specific CFLAGS with > > CFLAGS_REMOVE_target.o = -flags-to-remove > > but if you want to debug the kernel it is most likely not > a good idea to try and disable optimization as the code you then > are debugging might not have that much to do with the final code > once optimization is on again. So simply generate the .lst file > of the target you are trying to debug e.g. for kernel/sched/core.c: > > make kernel/sched/core.lst > > and then use that .lst file to understand the output of gdb you > are inspecting. Thanks for your reply! Besides,I also find that use "gcc -c -Q -O1 --help=optimizers" can print the exact set of optimizations. regards, Hao Lee _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
