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core: Build option for LTO(Link Time Optimization)

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This makes firmware size small but need to be tested more.
https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html#Optimize-Options
https://github.com/arduino/Arduino/issues/660
https://github.com/arduino/ArduinoCore-avr/blob/master/platform.txt

* No `-fno-fat-lto-objects` is needed, it is the default.
https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html#index-ffat-lto-objects
* No `-fuse-linker-plugin` is needed, it is the default.
https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html#index-fuse-linker-plugin
This commit is contained in:
tmk 2022-05-31 13:16:30 +09:00
parent 0e1aeaa2cb
commit 360872d269
1 changed files with 4 additions and 0 deletions
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4
tmk_core/rules.mk
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@ -139,6 +139,7 @@ CFLAGS += -Wstrict-prototypes
CFLAGS += -Wa,-adhlns=$(@:%.o=%.lst) CFLAGS += -Wa,-adhlns=$(@:%.o=%.lst)
CFLAGS += $(patsubst %,-I%,$(EXTRAINCDIRS)) CFLAGS += $(patsubst %,-I%,$(EXTRAINCDIRS))
CFLAGS += $(CSTANDARD) CFLAGS += $(CSTANDARD)
CFLAGS += -flto
ifdef CONFIG_H ifdef CONFIG_H
CFLAGS += -include $(CONFIG_H) CFLAGS += -include $(CONFIG_H)
endif endif
@ -173,6 +174,7 @@ CPPFLAGS += -Wundef
CPPFLAGS += -Wa,-adhlns=$(@:%.o=%.lst) CPPFLAGS += -Wa,-adhlns=$(@:%.o=%.lst)
CPPFLAGS += $(patsubst %,-I%,$(EXTRAINCDIRS)) CPPFLAGS += $(patsubst %,-I%,$(EXTRAINCDIRS))
#CPPFLAGS += $(CSTANDARD) #CPPFLAGS += $(CSTANDARD)
CPPFLAGS += -flto
ifdef CONFIG_H ifdef CONFIG_H
CPPFLAGS += -include $(CONFIG_H) CPPFLAGS += -include $(CONFIG_H)
endif endif
@ -189,6 +191,7 @@ endif
# dump that will be displayed for a given single line of source input. # dump that will be displayed for a given single line of source input.
ASFLAGS = $(ADEFS) -Wa,-adhlns=$(@:%.o=%.lst),-gstabs,--listing-cont-lines=100 ASFLAGS = $(ADEFS) -Wa,-adhlns=$(@:%.o=%.lst),-gstabs,--listing-cont-lines=100
ASFLAGS += $(patsubst %,-I%,$(EXTRAINCDIRS)) ASFLAGS += $(patsubst %,-I%,$(EXTRAINCDIRS))
ASFLAGS += -flto
ifdef CONFIG_H ifdef CONFIG_H
ASFLAGS += -include $(CONFIG_H) ASFLAGS += -include $(CONFIG_H)
endif endif
@ -261,6 +264,7 @@ LDFLAGS += $(PRINTF_LIB) $(SCANF_LIB) $(MATH_LIB)
#LDFLAGS += -T linker_script.x #LDFLAGS += -T linker_script.x
# You can give EXTRALDFLAGS at 'make' command line. # You can give EXTRALDFLAGS at 'make' command line.
LDFLAGS += $(EXTRALDFLAGS) LDFLAGS += $(EXTRALDFLAGS)
LDFLAGS += -flto