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sandbox: eliminate unused functions from binaries

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The sandbox should closely mimic other architectures.

Place each function or data in a separate section and let the linker
eliminate unused ones. This will reduce the binary size.

In the linker script mark that u_boot_sandbox_getopt are to be kept.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
This commit is contained in:
Heinrich Schuchardt 2023-10-24 08:30:47 +02:00 committed by Tom Rini
parent a4ed4c8a51
commit be6a249b41
2 changed files with 3 additions and 3 deletions
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4
arch/sandbox/config.mk
View file

@ -2,7 +2,7 @@
# Copyright (c) 2011 The Chromium OS Authors.
PLATFORM_CPPFLAGS += -D__SANDBOX__ -U_FORTIFY_SOURCE
PLATFORM_CPPFLAGS += -fPIC
PLATFORM_CPPFLAGS += -fPIC -ffunction-sections -fdata-sections
PLATFORM_LIBS += -lrt
SDL_CONFIG ?= sdl2-config
@ -30,7 +30,7 @@ cmd_u-boot__ = $(CC) -o $@ -Wl,-T u-boot.lds $(u-boot-init) \
$(u-boot-main) \
$(u-boot-keep-syms-lto) \
-Wl,--no-whole-archive \
$(PLATFORM_LIBS) -Wl,-Map -Wl,u-boot.map
$(PLATFORM_LIBS) -Wl,-Map -Wl,u-boot.map -Wl,--gc-sections
cmd_u-boot-spl = (cd $(obj) && $(CC) -o $(SPL_BIN) -Wl,-T u-boot-spl.lds \
$(KBUILD_LDFLAGS:%=-Wl,%) \

2
arch/sandbox/cpu/u-boot.lds
View file

@ -15,7 +15,7 @@ SECTIONS
_u_boot_sandbox_getopt : {
*(_u_boot_sandbox_getopt_start)
*(_u_boot_sandbox_getopt)
KEEP(*(_u_boot_sandbox_getopt))
*(_u_boot_sandbox_getopt_end)
}