diff options
Diffstat (limited to 'platforms/avr/platform.mk')
| -rw-r--r-- | platforms/avr/platform.mk | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/platforms/avr/platform.mk b/platforms/avr/platform.mk index 4d9cafaeef..0374e2e058 100644 --- a/platforms/avr/platform.mk +++ b/platforms/avr/platform.mk @@ -18,6 +18,13 @@ 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 +35,16 @@ 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 |