CONFIG_WERROR makes warnings into errors, but it only happens for *.c
files because -Werror is added to KBUILD_CFLAGS.
For example, you can put a #warning directive in any preprocessed
source file:
#warning "blah blah ..."
If it is placed in a *.c file, it emits a warning by default, and it
is promoted to an error when CONFIG_WERROR is enabled:
error: #warning "blah blah ..." [-Werror=cpp]
If it is placed in a *.S file, it is still a warning.
Move it to KBUILD_CPPFLAGS, so it works in the same way for *.c,
*.S, *.lds.S or whatever needs preprocessing.
Signed-off-by: Masahiro Yamada <masahiroy@xxxxxxxxxx>
---
Makefile | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/Makefile b/Makefile
index ebcb75442d7f..027d9163eff6 100644
--- a/Makefile
+++ b/Makefile
@@ -788,7 +788,8 @@ stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
KBUILD_CFLAGS += $(stackp-flags-y)
-KBUILD_CFLAGS-$(CONFIG_WERROR) += -Werror
+KBUILD_CPPFLAGS-$(CONFIG_WERROR) += -Werror
+KBUILD_CPPFLAGS += $(KBUILD_CPPFLAGS-y)
KBUILD_CFLAGS-$(CONFIG_CC_NO_ARRAY_BOUNDS) += -Wno-array-bounds
KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) $(CONFIG_CC_IMPLICIT_FALLTHROUGH)
--
2.34.1
