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| author | Kele Zhang <zhangcola2003@gmail.com> | 2024-10-01 23:05:51 +0000 |
|---|---|---|
| committer | Anup Patel <anup@brainfault.org> | 2024-11-06 16:29:39 +0530 |
| commit | 0171cfcc7010bcd75277a2c452e9702d934230f9 (patch) | |
| tree | d8260651f0c540c239151e2a8cdbd25b54cdf4d2 | |
| parent | 369c64517ee5c2753a33a5ff7695b4d2b6066e7b (diff) | |
| download | opensbi-0171cfcc7010bcd75277a2c452e9702d934230f9.zip opensbi-0171cfcc7010bcd75277a2c452e9702d934230f9.tar.gz opensbi-0171cfcc7010bcd75277a2c452e9702d934230f9.tar.bz2 | |
Makefile: enable --gc-sections
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>
| -rw-r--r-- | Makefile | 15 | ||||
| -rw-r--r-- | firmware/fw_base.ldS | 1 |
2 files changed, 10 insertions, 6 deletions
@@ -355,12 +355,7 @@ GENFLAGS += $(libsbiutils-genflags-y) GENFLAGS += $(platform-genflags-y) GENFLAGS += $(firmware-genflags-y) -CFLAGS = -g -Wall -Werror -ffreestanding -nostdlib -fno-stack-protector -fno-strict-aliasing -ifneq ($(DEBUG),) -CFLAGS += -O0 -else -CFLAGS += -O2 -endif +CFLAGS = -g -Wall -Werror -ffreestanding -nostdlib -fno-stack-protector -fno-strict-aliasing -ffunction-sections -fdata-sections CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls # Optionally supported flags ifeq ($(CC_SUPPORT_SAVE_RESTORE),y) @@ -406,6 +401,7 @@ ASFLAGS += $(firmware-asflags-y) ARFLAGS = rcs ELFFLAGS += $(USE_LD_FLAG) +ELFFLAGS += -Wl,--gc-sections ifeq ($(OPENSBI_LD_EXCLUDE_LIBS),y) ELFFLAGS += -Wl,--exclude-libs,ALL endif @@ -424,6 +420,13 @@ MERGEFLAGS += -m elf$(PLATFORM_RISCV_XLEN)lriscv 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 define dynamic_flags -I$(shell dirname $(2)) -D__OBJNAME__=$(subst -,_,$(shell basename $(1) .o)) diff --git a/firmware/fw_base.ldS b/firmware/fw_base.ldS index fb47984..a33746a 100644 --- a/firmware/fw_base.ldS +++ b/firmware/fw_base.ldS @@ -20,6 +20,7 @@ PROVIDE(_text_start = .); *(.entry) *(.text) + *(.text.*) . = ALIGN(8); PROVIDE(_text_end = .); } |