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Retain space saving benefits when not using LTO

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bricky149 2023-10-04 22:24:07 +01:00
parent fe949d2ae3
commit 4a05e69e19
2 changed files with 11 additions and 1 deletions
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10
Makefile
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@ -170,9 +170,14 @@ CFLAGS = -Os -Wall -Werror -mcpu=cortex-m0 -fno-builtin -fshort-enums -fno-delet
ifeq ($(ENABLE_LTO), 1) ifeq ($(ENABLE_LTO), 1)
# CFLAGS += -flto # CFLAGS += -flto
CFLAGS += -flto=2 CFLAGS += -flto=2
else
# We get most of the space savings if LTO creates problems
CFLAGS += -ffunction-sections -fdata-sections
endif endif
# May cause unhelpful build failures
#CFLAGS += -Wpadded #CFLAGS += -Wpadded
CFLAGS += -DPRINTF_INCLUDE_CONFIG_H CFLAGS += -DPRINTF_INCLUDE_CONFIG_H
CFLAGS += -DGIT_HASH=\"$(GIT_HASH)\" CFLAGS += -DGIT_HASH=\"$(GIT_HASH)\"
ifeq ($(ENABLE_SWD),1) ifeq ($(ENABLE_SWD),1)
@ -280,6 +285,11 @@ LDFLAGS = -mcpu=cortex-m0 -nostartfiles -Wl,-T,firmware.ld
# Use newlib-nano instead of newlib # Use newlib-nano instead of newlib
LDFLAGS += --specs=nano.specs LDFLAGS += --specs=nano.specs
ifeq ($(ENABLE_LTO), 0)
# Throw away unneeded func/data sections like LTO does
LDFLAGS += -Wl,--gc-sections
endif
ifeq ($(DEBUG),1) ifeq ($(DEBUG),1)
ASFLAGS += -g ASFLAGS += -g
CFLAGS += -g CFLAGS += -g

2
firmware.ld
View File

@ -17,7 +17,7 @@ SECTIONS
.text : .text :
{ {
. = ALIGN(4); . = ALIGN(4);
*(.text.isr) /* .text sections of code */ KEEP(*(.text.isr)) /* .text sections of code */
*(.text) /* .text sections of code */ *(.text) /* .text sections of code */
*(.text*) /* .text* sections of code */ *(.text*) /* .text* sections of code */
*(.rodata) /* .rodata sections */ *(.rodata) /* .rodata sections */