On Thu, Dec 3, 2020 at 1:44 AM Kees Cook <keesc...@chromium.org> wrote:
>
> With UBSAN_OBJECT_SIZE disabled for GCC, only UBSAN_ALIGNMENT remained
> a noisy UBSAN option. Disable it for COMPILE_TEST so the rest of UBSAN
> can be used for full all*config builds or other large combinations.
>
> Link:
> https://lore.kernel.org/lkml/CAHk-=wgXW=ylxgn0qvpp-1w5gdd2pf1w-fqy15pokzovfik...@mail.gmail.com/
> Signed-off-by: Kees Cook <keesc...@chromium.org>
Have you checked if this has a notable impact on allmodconfig compile speed
with gcc or clang? I think I've seen significant increases in build times before
with this, but I don't remember the actual magnitude.
Making it 20% slower would probably be ok, but making it twice as slow might
be too much.
Arnd
