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[Core] Squeeze AVR some more with -mrelax and -mcall-prologues #16269

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merged 2 commits into from
Feb 27, 2022
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[Core] Squeeze AVR some more with -mrelax and -mcall-prologues #16269

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73c128c
[Core] Enable linker relaxation for AVR targets
KarlK90 Feb 7, 2022
32dfd75
[Core] Use -mcall-prologues the save code size
KarlK90 Feb 7, 2022
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9 changes: 8 additions & 1 deletion platforms/avr/platform.mk
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Original file line number Diff line number Diff line change
Expand Up @@ -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)

Expand All @@ -28,7 +35,7 @@ CFLAGS += -fno-strict-aliasing
CXXFLAGS += $(COMPILEFLAGS)
CXXFLAGS += -fno-exceptions -std=c++11

LDFLAGS +=-Wl,--gc-sections
LDFLAGS += -Wl,--gc-sections

OPT_DEFS += -DF_CPU=$(F_CPU)UL

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