From: Masahiro Yamada Date: Tue, 6 Dec 2022 04:07:31 +0000 (+0900) Subject: kbuild: add -Wundef to KBUILD_CPPFLAGS for W=1 builds X-Git-Tag: v6.6.7~3856^2~12 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=80b6093b55e31c2c40ff082fb32523d4e852954f;p=platform%2Fkernel%2Flinux-starfive.git kbuild: add -Wundef to KBUILD_CPPFLAGS for W=1 builds The use of an undefined macro in an #if directive is warned, but only in *.c files. No warning from other files such as *.S, *.lds.S. Since -Wundef is a preprocessor-related warning, it should be added to KBUILD_CPPFLAGS instead of KBUILD_CFLAGS. My previous attempt [1] uncovered several issues. I could not finish fixing them all. This commit adds -Wundef to KBUILD_CPPFLAGS for W=1 builds in order to block new breakages. (The kbuild test robot tests with W=1) We can fix the warnings one by one. After fixing all of them, we can make it default in the top Makefile, and remove -Wundef from KBUILD_CFLAGS. [1]: https://lore.kernel.org/all/20221012180118.331005-2-masahiroy@kernel.org/ Signed-off-by: Masahiro Yamada Reviewed-by: Nathan Chancellor Reviewed-by: Nick Desaulniers --- diff --git a/scripts/Makefile.extrawarn b/scripts/Makefile.extrawarn index 6bbba36..40cd13e 100644 --- a/scripts/Makefile.extrawarn +++ b/scripts/Makefile.extrawarn @@ -38,6 +38,7 @@ KBUILD_CFLAGS += -Wno-sign-compare KBUILD_CFLAGS += -Wno-type-limits KBUILD_CFLAGS += -Wno-shift-negative-value +KBUILD_CPPFLAGS += -Wundef KBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN1 else