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Subject[PATCH] kbuild: clang: disable unused variable warnings only when constant
Currently, GCC disables -Wunused-const-variable, but not
-Wunused-variable, so warns unused variables if they are

While, Clang does not warn unused variables at all regardless of
the const qualifier because -Wno-unused-const-variable is implied
by the stronger option -Wno-unused-variable.

Disable -Wunused-const-variable instead of -Wunused-variable so that
GCC and Clang work in the same way.

Signed-off-by: Prasad Sodagudi <>
Reviewed-by: Masahiro Yamada <>
Makefile | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index 11aff0f..ca0a571 100644
--- a/Makefile
+++ b/Makefile
@@ -700,7 +700,6 @@ KBUILD_CFLAGS += $(stackp-flag)

ifeq ($(cc-name),clang)
KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
-KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
@@ -718,9 +717,9 @@ else
# These warnings generated too much noise in a regular build.
# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
-KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)

+KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,\na Linux Foundation Collaborative Project
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