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authorMasahiro Yamada <masahiroy@kernel.org>2022-12-06 07:07:31 +0300
committerMasahiro Yamada <masahiroy@kernel.org>2022-12-11 11:28:32 +0300
commit80b6093b55e31c2c40ff082fb32523d4e852954f (patch)
tree0065c41f359d87918fac91fe76045466813cf700 /scripts
parentefa80b028c7a9c74fd875517aa0fc9fd8d610ed0 (diff)
downloadlinux-80b6093b55e31c2c40ff082fb32523d4e852954f.tar.xz
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 <masahiroy@kernel.org> Reviewed-by: Nathan Chancellor <nathan@kernel.org> Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Diffstat (limited to 'scripts')
-rw-r--r--scripts/Makefile.extrawarn1
1 files changed, 1 insertions, 0 deletions
diff --git a/scripts/Makefile.extrawarn b/scripts/Makefile.extrawarn
index 6bbba36c5969..40cd13eca82e 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