diff options
Diffstat (limited to 'platforms/avr/platform.mk')
| -rw-r--r-- | platforms/avr/platform.mk | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/platforms/avr/platform.mk b/platforms/avr/platform.mk index 4d9cafaeef..978199b385 100644 --- a/platforms/avr/platform.mk +++ b/platforms/avr/platform.mk @@ -12,12 +12,24 @@ HEX = $(OBJCOPY) -O $(FORMAT) -R .eeprom -R .fuse -R .lock -R .signature EEP = $(OBJCOPY) -j .eeprom --set-section-flags=.eeprom="alloc,load" --change-section-lma .eeprom=0 --no-change-warnings -O $(FORMAT) BIN = +# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105523 +ifneq ($(findstring 12.,$(shell avr-gcc --version 2>/dev/null)),) +COMPILEFLAGS += --param=min-pagesize=0 +endif + COMPILEFLAGS += -funsigned-char COMPILEFLAGS += -funsigned-bitfields COMPILEFLAGS += -ffunction-sections COMPILEFLAGS += -fdata-sections COMPILEFLAGS += -fpack-struct COMPILEFLAGS += -fshort-enums +COMPILEFLAGS += -mcall-prologues + +# Linker relaxation is only possible if +# link time optimizations are not enabled. +ifeq ($(strip $(LTO_ENABLE)), no) + COMPILEFLAGS += -mrelax +endif ASFLAGS += $(AVR_ASFLAGS) @@ -28,7 +40,16 @@ CFLAGS += -fno-strict-aliasing CXXFLAGS += $(COMPILEFLAGS) CXXFLAGS += -fno-exceptions -std=c++11 -LDFLAGS +=-Wl,--gc-sections +LDFLAGS += -Wl,--gc-sections + +# Use AVR's libc minimal printf implementation which has less features +# and thus can shave ~400 bytes. Usually we use the xprintf +# implementation but keyboards that use s(n)printf automatically +# pull in the AVR libc implementation, which is ~900 bytes heavy. +AVR_USE_MINIMAL_PRINTF ?= no +ifeq ($(strip $(AVR_USE_MINIMAL_PRINTF)), yes) + LDFLAGS += -Wl,--whole-archive -lprintf_min -Wl,--no-whole-archive +endif OPT_DEFS += -DF_CPU=$(F_CPU)UL |