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build: Default to O2 optimization 

Default to O2 and set Os in the AVR makefile.  Platforms besides AVR
are likely to produce better code with O2 so make that the default.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2016-06-10 19:03:40 -04:00
parent b3e4ff7ef0
commit ea5f825a91
2 changed files with 2 additions and 2 deletions
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2
Makefile
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@ -32,7 +32,7 @@ dirs-y = src
cc-option=$(shell if test -z "`$(1) $(2) -S -o /dev/null -xc /dev/null 2>&1`" \ cc-option=$(shell if test -z "`$(1) $(2) -S -o /dev/null -xc /dev/null 2>&1`" \
; then echo "$(2)"; else echo "$(3)"; fi ;) ; then echo "$(2)"; else echo "$(3)"; fi ;)
CFLAGS-y := -I$(OUT) -Isrc -I$(OUT)board-generic/ -Os -MD -g \ CFLAGS-y := -I$(OUT) -Isrc -I$(OUT)board-generic/ -O2 -MD -g \
-Wall -Wold-style-definition $(call cc-option,$(CC),-Wtype-limits,) \ -Wall -Wold-style-definition $(call cc-option,$(CC),-Wtype-limits,) \
-ffunction-sections -fdata-sections -ffunction-sections -fdata-sections
CFLAGS-y += -flto -fwhole-program CFLAGS-y += -flto -fwhole-program

2
src/avr/Makefile
View File

@ -5,7 +5,7 @@ CROSS_PREFIX=avr-
dirs-y += src/avr lib/pjrc_usb_serial dirs-y += src/avr lib/pjrc_usb_serial
CFLAGS-y += -mmcu=$(CONFIG_MCU) -DF_CPU=$(CONFIG_CLOCK_FREQ) CFLAGS-y += -Os -mmcu=$(CONFIG_MCU) -DF_CPU=$(CONFIG_CLOCK_FREQ)
LDFLAGS-y += -Wl,--relax LDFLAGS-y += -Wl,--relax
# Add avr source files # Add avr source files