On Mon, Oct 29, 2018 at 10:16:02PM +0900, Masahiro Yamada wrote:

On Sun, Oct 28, 2018 at 10:11 PM Changbin Du [off-list ref] wrote:

quoted

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.

I have tested your kbuild branch and no issues found. Thanks for checking this
series!

--
Best Regards
Masahiro Yamada

-- 
Thanks,
Changbin Du