On Sun, Oct 28, 2018 at 10:11 PM Changbin Du <changbin.du@xxxxxxxxx> wrote: > > This will apply GCC '-Og' optimization level which is supported > since GCC 4.8. This optimization level offers a reasonable level > of optimization while maintaining fast compilation and a good > debugging experience. It is similar to '-O1' while perferring > to keep debug ability over runtime speed. > > If enabling this option breaks your kernel, you should either > disable this or find a fix (mostly in the arch code). Currently > this option has only been tested on x86_64 and arm platform. > > This option can satisfy people who was searching for a method > to disable compiler optimizations so to achieve better kernel > debugging experience with kgdb or qemu. > > The main problem of '-Og' is we must not use __attribute__((error(msg))). > The compiler will report error though the call to error function > still can be optimize out. So we must fallback to array tricky. I removed the sentence "So we must fallback to array tricky." Commit 81b45683487a51b0f4d3b29d37f20d6d078544e4 killed the fallback to the negative array trick. I also resolved a conflict. Your series is now available in the following branch. git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild kbuild Please double check if I did it correctly. -- Best Regards Masahiro Yamada
