4.14-stable review patch. If anyone has any objections, please let me know.
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From: Sodagudi Prasad psodagud@codeaurora.org
commit 0a5f41767444cc3b4fc5573921ab914b4f78baaa upstream.
Currently, GCC disables -Wunused-const-variable, but not -Wunused-variable, so warns unused variables if they are non-constant.
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 psodagud@codeaurora.org Signed-off-by: Masahiro Yamada yamada.masahiro@socionext.com Cc: Guenter Roeck linux@roeck-us.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- Makefile | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
--- a/Makefile +++ b/Makefile @@ -706,7 +706,6 @@ 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) @@ -724,9 +723,9 @@ 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) endif
+KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) ifdef CONFIG_FRAME_POINTER KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls else