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stm32/Makefile: Enable link-time-optimisation via LTO=1 make option. 

When tested, this reduces default MP binary sizes by approx 2-2.5%, and
very marginally increases performance in benchmarks. Build times seem very
similar to non-LTO when using gcc 12.

See #8733 for further discussion.

Signed-off-by: Angus Gratton <gus@projectgus.com>
This commit is contained in:
Angus Gratton 2022-06-07 17:34:40 +10:00 committed by Damien George
parent 2c015375d1
commit e76d88b531
1 changed files with 13 additions and 4 deletions
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17
ports/stm32/Makefile
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@ -96,13 +96,22 @@ CFLAGS += -fsingle-precision-constant
endif
endif
LDFLAGS = -nostdlib -L $(LD_DIR) $(addprefix -T,$(LD_FILES)) -Map=$(@:.elf=.map) --cref
LDFLAGS += --defsym=_estack_reserve=8
LDFLAGS = -nostdlib -L $(LD_DIR) $(addprefix -T,$(LD_FILES)) -Wl,-Map=$(@:.elf=.map) -Wl,--cref
LDFLAGS += -Wl,--defsym=_estack_reserve=8
LIBS += "$(shell $(CC) $(CFLAGS) -print-libgcc-file-name)"
# Remove uncalled code from the final image.
CFLAGS += -fdata-sections -ffunction-sections
LDFLAGS += --gc-sections
LDFLAGS += -Wl,--gc-sections
ifeq ($(LTO),1)
CFLAGS += -flto=auto
# LTO requires passing compiler flags to the linker as it will run the assembler.
# To avoid risk of missing something relevant, pass all flags except for preprocessor args
LDFLAGS += $(filter-out -I%,$(filter-out -D%,$(CFLAGS)))
$(BUILD)/stm32_it.o $(BUILD)/pendsv.o: CFLAGS += -fno-lto
endif
# Debugging/Optimization
ifeq ($(DEBUG), 1)
@ -592,7 +601,7 @@ endef
define GENERATE_ELF
$(ECHO) "LINK $(1)"
$(Q)$(LD) $(LDFLAGS) -o $(1) $(2) $(LDFLAGS_MOD) $(LIBS)
$(Q)$(CC) $(LDFLAGS) -o $(1) $(2) $(LDFLAGS_MOD) $(LIBS)
$(Q)$(SIZE) $(1)
$(if $(filter-out $(TEXT0_ADDR),0x08000000), \
$(ECHO) "INFO: this build requires mboot to be installed first")