kbuild: Turn a couple more of clang's unused option warnings into errors

Currently, these warnings are hidden with -Qunused-arguments in
KBUILD_CPPFLAGS. Once that option is removed, these warnings should be
turned into hard errors to make unconditionally added but unsupported
flags for the current compilation mode or target obvious due to a failed
build; otherwise, the warnings might just be ignored if the build log is
not checked.

Link: https://github.com/ClangBuiltLinux/linux/issues/1587
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Tested-by: Linux Kernel Functional Testing <lkft@linaro.org>
Tested-by: Anders Roxell <anders.roxell@linaro.org>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

diff --git a/scripts/Makefile.clang b/scripts/Makefile.clang
index 87285b7..70b354f 100644 (file)
--- a/scripts/Makefile.clang
+++ b/scripts/Makefile.clang
@@ -36,6 +36,8 @@ endif
 # so they can be implemented or wrapped in cc-option.
 CLANG_FLAGS    += -Werror=unknown-warning-option
 CLANG_FLAGS    += -Werror=ignored-optimization-argument
+CLANG_FLAGS    += -Werror=option-ignored
+CLANG_FLAGS    += -Werror=unused-command-line-argument
 KBUILD_CFLAGS  += $(CLANG_FLAGS)
 KBUILD_AFLAGS  += $(CLANG_FLAGS)
 export CLANG_FLAGS