https://bugzilla.kernel.org/show_bug.cgi?id=207173 --- Comment #6 from Sean Christopherson (sean.j.christopherson@xxxxxxxxx) --- Ah, fun. So this falls into the "not technically a kernel problem" category. O3 isn't supported outside of the ARC architecture (no clue why it "needs" O3), and AFAICT, has never been a selectable Kconfig option outside of ARC. The false positives with -Wmaybe-uninitialized and -O3 (and -Os) is a known issue, e.g. the kernel adds -Wno-maybe-uninitialized when compiling with either of those options. Unfortunately, there is no direct way to force CONFIG_CC_DISABLE_WARN_MAYBE_UNINITIALIZED=y. You could select CONFIG_CC_OPTIMIZE_FOR_SIZE and then edit your Makefile, but I think that might have unwanted side effects. The easiest way to workaround this issue is to do CONFIG_KVM_WERROR=n. The false positive warning will still occur, but it won't get escalated to an error and break your build. I'm guessing there's a way to get -Wno-maybe-uninitialized, but disabling -Werror for KVM is easy and doesn't really have downsides. -- You are receiving this mail because: You are watching the assignee of the bug.
