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Makefile: enable --gc-sections

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The --gc-sections option enables the linker to perform garbage
collection of unreferenced code and data, thereby reducing the binary
size.

The -ffunction-sections option will place each function into a separate
section, so it is necessary to add .text.* to the linker script.

Signed-off-by: Kele Zhang <zhangcola2003@gmail.com>
Signed-off-by: Yuan Tan <tanyuan@tinylab.org>
Signed-off-by: Zhangjin Wu <falcon@tinylab.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Xiang W <wxjstz@126.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Kele Zhang
2024-10-01 23:05:51 +00:00
committed by Anup Patel
parent 369c64517e
commit 0171cfcc70
2 changed files with 10 additions and 6 deletions
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15
Makefile
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@@ -355,12 +355,7 @@ GENFLAGS += $(libsbiutils-genflags-y)
GENFLAGS += $(platform-genflags-y) GENFLAGS += $(platform-genflags-y)
GENFLAGS += $(firmware-genflags-y) GENFLAGS += $(firmware-genflags-y)
CFLAGS = -g -Wall -Werror -ffreestanding -nostdlib -fno-stack-protector -fno-strict-aliasing CFLAGS = -g -Wall -Werror -ffreestanding -nostdlib -fno-stack-protector -fno-strict-aliasing -ffunction-sections -fdata-sections
ifneq ($(DEBUG),)
CFLAGS += -O0
else
CFLAGS += -O2
endif
CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
# Optionally supported flags # Optionally supported flags
ifeq ($(CC_SUPPORT_SAVE_RESTORE),y) ifeq ($(CC_SUPPORT_SAVE_RESTORE),y)
@@ -406,6 +401,7 @@ ASFLAGS += $(firmware-asflags-y)
ARFLAGS = rcs ARFLAGS = rcs
ELFFLAGS += $(USE_LD_FLAG) ELFFLAGS += $(USE_LD_FLAG)
ELFFLAGS += -Wl,--gc-sections
ifeq ($(OPENSBI_LD_EXCLUDE_LIBS),y) ifeq ($(OPENSBI_LD_EXCLUDE_LIBS),y)
ELFFLAGS += -Wl,--exclude-libs,ALL ELFFLAGS += -Wl,--exclude-libs,ALL
endif endif
@@ -424,6 +420,13 @@ MERGEFLAGS += -m elf$(PLATFORM_RISCV_XLEN)lriscv
DTSCPPFLAGS = $(CPPFLAGS) -nostdinc -nostdlib -fno-builtin -D__DTS__ -x assembler-with-cpp DTSCPPFLAGS = $(CPPFLAGS) -nostdinc -nostdlib -fno-builtin -D__DTS__ -x assembler-with-cpp
ifneq ($(DEBUG),)
CFLAGS += -O0
ELFFLAGS += -Wl,--print-gc-sections
else
CFLAGS += -O2
endif
# Setup functions for compilation # Setup functions for compilation
define dynamic_flags define dynamic_flags
-I$(shell dirname $(2)) -D__OBJNAME__=$(subst -,_,$(shell basename $(1) .o)) -I$(shell dirname $(2)) -D__OBJNAME__=$(subst -,_,$(shell basename $(1) .o))

1
firmware/fw_base.ldS
View File

@@ -20,6 +20,7 @@
PROVIDE(_text_start = .); PROVIDE(_text_start = .);
*(.entry) *(.entry)
*(.text) *(.text)
*(.text.*)
. = ALIGN(8); . = ALIGN(8);
PROVIDE(_text_end = .); PROVIDE(_text_end = .);
} }