On 10/22/23 08:29, Heinrich Schuchardt wrote:
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.
Signed-off-by: Heinrich Schuchardt <heinrich.schucha...@canonical.com>
---
arch/sandbox/config.mk | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/sandbox/config.mk b/arch/sandbox/config.mk
index 2d184c5f65..c02f0229c2 100644
--- a/arch/sandbox/config.mk
+++ b/arch/sandbox/config.mk
@@ -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
@@ -26,6 +26,7 @@ cmd_u-boot__ = $(CC) -o $@ -Wl,-T u-boot.lds $(u-boot-init) \
$(KBUILD_LDFLAGS:%=-Wl,%) \
$(SANITIZERS) \
$(LTO_FINAL_LDFLAGS) \
+ -Wl,--gc-section \
-Wl,--whole-archive \
$(u-boot-main) \
$(u-boot-keep-syms-lto) \
@@ -37,6 +38,7 @@ cmd_u-boot-spl = (cd $(obj) && $(CC) -o $(SPL_BIN) -Wl,-T
u-boot-spl.lds \
$(SANITIZERS) \
$(LTO_FINAL_LDFLAGS) \
$(patsubst $(obj)/%,%,$(u-boot-spl-init)) \
+ -Wl,--gc-section \
-Wl,--whole-archive \
$(patsubst $(obj)/%,%,$(u-boot-spl-main)) \
$(patsubst $(obj)/%,%,$(u-boot-spl-platdata)) \
In arch/sandbox/cpu/u-boot.lds we must enforce keeping the command line
options like we do for other linker generated lists.
_u_boot_sandbox_getopt : {
- *(_u_boot_sandbox_getopt_start)
- *(_u_boot_sandbox_getopt)
- *(_u_boot_sandbox_getopt_end)
+ KEEP(*(_u_boot_sandbox_getopt_start))
+ KEEP(*(_u_boot_sandbox_getopt))
+ KEEP(*(_u_boot_sandbox_getopt_end))
}
We might have used the normal linker lists here.
Best regards
Heinrich
