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Commit 076f421d authored Oct 30, 2018 by Masahiro Yamada

kbuild: replace cc-name test with CONFIG_CC_IS_CLANG



Evaluating cc-name invokes the compiler every time even when you are
not compiling anything, like 'make help'. This is not efficient.

The compiler type has been already detected in the Kconfig stage.
Use CONFIG_CC_IS_CLANG, instead.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
Acked-by: Paul Burton <paul.burton@mips.com> (MIPS)
Acked-by: Joel Stanley <joel@jms.id.au>

parent 2cd3faf8

Makefile

+1 −1

Original line number	Original line	Diff line number	Diff line
	@@ -702,7 +702,7 @@ stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong

	KBUILD_CFLAGS += $(stackp-flags-y)		KBUILD_CFLAGS += $(stackp-flags-y)

	ifeq ($(cc-name),clang)		ifdef CONFIG_CC_IS_CLANG
	KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)		KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
	KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)		KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
	KBUILD_CFLAGS += $(call cc-disable-warning, gnu)		KBUILD_CFLAGS += $(call cc-disable-warning, gnu)

arch/mips/Makefile

+1 −1

Original line number	Original line	Diff line number	Diff line
	@@ -128,7 +128,7 @@ cflags-y += -ffreestanding
	# clang's output will be based upon the build machine. So for clang we simply		# clang's output will be based upon the build machine. So for clang we simply
	# unconditionally specify -EB or -EL as appropriate.		# unconditionally specify -EB or -EL as appropriate.
	#		#
	ifeq ($(cc-name),clang)		ifdef CONFIG_CC_IS_CLANG
	cflags-$(CONFIG_CPU_BIG_ENDIAN) += -EB		cflags-$(CONFIG_CPU_BIG_ENDIAN) += -EB
	cflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -EL		cflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -EL
	else		else

arch/mips/vdso/Makefile

+1 −1

Original line number	Original line	Diff line number	Diff line
	@@ -10,7 +10,7 @@ ccflags-vdso := \
	$(filter -march=%,$(KBUILD_CFLAGS)) \		$(filter -march=%,$(KBUILD_CFLAGS)) \
	-D__VDSO__		-D__VDSO__

	ifeq ($(cc-name),clang)		ifdef CONFIG_CC_IS_CLANG
	ccflags-vdso += $(filter --target=%,$(KBUILD_CFLAGS))		ccflags-vdso += $(filter --target=%,$(KBUILD_CFLAGS))
	endif		endif

arch/powerpc/Makefile

+2 −2

Original line number	Original line	Diff line number	Diff line
	@@ -96,7 +96,7 @@ aflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mabi=elfv1)
	aflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mabi=elfv2		aflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mabi=elfv2
	endif		endif

	ifneq ($(cc-name),clang)		ifndef CONFIG_CC_IS_CLANG
	cflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mno-strict-align		cflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mno-strict-align
	endif		endif

	@@ -175,7 +175,7 @@ endif
	# Work around gcc code-gen bugs with -pg / -fno-omit-frame-pointer in gcc <= 4.8		# Work around gcc code-gen bugs with -pg / -fno-omit-frame-pointer in gcc <= 4.8
	# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=44199		# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=44199
	# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52828		# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52828
	ifneq ($(cc-name),clang)		ifndef CONFIG_CC_IS_CLANG
	CC_FLAGS_FTRACE += $(call cc-ifversion, -lt, 0409, -mno-sched-epilog)		CC_FLAGS_FTRACE += $(call cc-ifversion, -lt, 0409, -mno-sched-epilog)
	endif		endif
	endif		endif

scripts/Makefile.extrawarn

+1 −1

Original line number	Original line	Diff line number	Diff line
	@@ -64,7 +64,7 @@ endif
	KBUILD_CFLAGS += $(warning)		KBUILD_CFLAGS += $(warning)
	else		else

	ifeq ($(cc-name),clang)		ifdef CONFIG_CC_IS_CLANG
	KBUILD_CFLAGS += $(call cc-disable-warning, initializer-overrides)		KBUILD_CFLAGS += $(call cc-disable-warning, initializer-overrides)
	KBUILD_CFLAGS += $(call cc-disable-warning, unused-value)		KBUILD_CFLAGS += $(call cc-disable-warning, unused-value)
	KBUILD_CFLAGS += $(call cc-disable-warning, format)		KBUILD_CFLAGS += $(call cc-disable-warning, format)

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