Make LTO available for sandbox architecture.

Signed-off-by: Marek Behún <marek.be...@nic.cz>
---
 arch/Kconfig           | 1 +
 arch/sandbox/config.mk | 4 ++--
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/Kconfig b/arch/Kconfig
index 27843cd79c..a6dab3e56d 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -101,6 +101,7 @@ config RISCV
 
 config SANDBOX
        bool "Sandbox"
+       select ARCH_SUPPORTS_LTO
        select BOARD_LATE_INIT
        select BZIP2
        select CMD_POWEROFF
diff --git a/arch/sandbox/config.mk b/arch/sandbox/config.mk
index ebbb094744..d9c430794e 100644
--- a/arch/sandbox/config.mk
+++ b/arch/sandbox/config.mk
@@ -16,11 +16,11 @@ PLATFORM_LIBS += $(shell $(SDL_CONFIG) --libs)
 PLATFORM_CPPFLAGS += $(shell $(SDL_CONFIG) --cflags)
 endif
 
-cmd_u-boot__ = $(CC) -o $@ -Wl,-T u-boot.lds $(u-boot-init) \
+cmd_u-boot__ = $(CC) $(LTO_FINAL_CFLAGS) -o $@ -Wl,-T u-boot.lds 
$(u-boot-init) \
        -Wl,--whole-archive $(u-boot-main) -Wl,--no-whole-archive \
        $(PLATFORM_LIBS) -Wl,-Map -Wl,u-boot.map
 
-cmd_u-boot-spl = (cd $(obj) && $(CC) -o $(SPL_BIN) -Wl,-T u-boot-spl.lds \
+cmd_u-boot-spl = (cd $(obj) && $(CC) $(LTO_FINAL_CFLAGS) -o $(SPL_BIN) -Wl,-T 
u-boot-spl.lds \
        $(patsubst $(obj)/%,%,$(u-boot-spl-init)) \
        -Wl,--whole-archive $(patsubst $(obj)/%,%,$(u-boot-spl-main)) 
-Wl,--no-whole-archive \
        -Wl,--start-group $(patsubst $(obj)/%,%,$(u-boot-spl-platdata)) 
-Wl,--end-group \
-- 
2.26.2

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