Commit 15f5db60 authored by Masahiro Yamada's avatar Masahiro Yamada
Browse files

kbuild,arc: add CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3 for ARC 



arch/arc/Makefile overrides -O2 with -O3. This is the only user of
ARCH_CFLAGS. There is no user of ARCH_CPPFLAGS or ARCH_AFLAGS.
My plan is to remove ARCH_{CPP,A,C}FLAGS after refactoring the ARC
Makefile.

Currently, ARC has no way to enable -Wmaybe-uninitialized because both
-O3 and -Os disable it. Enabling it will be useful for compile-testing.
This commit allows allmodconfig (, which defaults to -O2) to enable it.

Add CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3=y to all the defconfig files
in arch/arc/configs/ in order to keep the current config settings.

Signed-off-by: default avatarMasahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: default avatarVineet Gupta <vgupta@synopsys.com>
parent e2079e93

Makefile

+6 −4
Original line number Diff line number Diff line
@@ -723,10 +723,12 @@ KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 
KBUILD_CFLAGS	+= $(call cc-disable-warning, format-overflow)

KBUILD_CFLAGS	+= $(call cc-disable-warning, address-of-packed-member)



ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE

KBUILD_CFLAGS	+= -Os

else

ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE

KBUILD_CFLAGS += -O2

else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3

KBUILD_CFLAGS += -O3

else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE

KBUILD_CFLAGS += -Os

endif



ifdef CONFIG_CC_DISABLE_WARN_MAYBE_UNINITIALIZED

arch/arc/Makefile

+0 −8
Original line number Diff line number Diff line
@@ -48,14 +48,6 @@ endif 
cfi := $(call as-instr,.cfi_startproc\n.cfi_endproc,-DARC_DW2_UNWIND_AS_CFI)

cflags-$(CONFIG_ARC_DW2_UNWIND)		+= -fasynchronous-unwind-tables $(cfi)



ifndef CONFIG_CC_OPTIMIZE_FOR_SIZE

# Generic build system uses -O2, we want -O3

# Note: No need to add to cflags-y as that happens anyways

#

# Disable the false maybe-uninitialized warings gcc spits out at -O3

ARCH_CFLAGS += -O3 $(call cc-disable-warning,maybe-uninitialized,)

endif



# small data is default for elf32 tool-chain. If not usable, disable it

# This also allows repurposing GP as scratch reg to gcc reg allocator

disable_small_data := y

arch/arc/configs/axs101_defconfig

+1 −0
Original line number Diff line number Diff line
@@ -9,6 +9,7 @@ CONFIG_NAMESPACES=y 
# CONFIG_UTS_NS is not set

# CONFIG_PID_NS is not set

CONFIG_BLK_DEV_INITRD=y

CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3=y

CONFIG_EMBEDDED=y

CONFIG_PERF_EVENTS=y

# CONFIG_VM_EVENT_COUNTERS is not set

arch/arc/configs/axs103_defconfig

+1 −0
Original line number Diff line number Diff line
@@ -9,6 +9,7 @@ CONFIG_NAMESPACES=y 
# CONFIG_UTS_NS is not set

# CONFIG_PID_NS is not set

CONFIG_BLK_DEV_INITRD=y

CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3=y

CONFIG_EMBEDDED=y

CONFIG_PERF_EVENTS=y

# CONFIG_VM_EVENT_COUNTERS is not set

arch/arc/configs/axs103_smp_defconfig

+1 −0
Original line number Diff line number Diff line
@@ -9,6 +9,7 @@ CONFIG_NAMESPACES=y 
# CONFIG_UTS_NS is not set

# CONFIG_PID_NS is not set

CONFIG_BLK_DEV_INITRD=y

CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3=y

CONFIG_EMBEDDED=y

CONFIG_PERF_EVENTS=y

# CONFIG_VM_EVENT_COUNTERS is not set

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