From: Simon Glass <sjg@chromium.org> Provide a rule which creates a libu-boot.so file which can be used to provide some of U-Boot's functionality to another program. Move the RISCV up a line so it is clear that it relates to the u-boot target. For now this is not very useful, as everything is bound together, and U-Boot will just start normally when the library is used (including waiting for the user to type commands!). Further work will improve this over time. Signed-off-by: Simon Glass <sjg@chromium.org> --- Makefile | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-) diff --git a/Makefile b/Makefile index fb4358b1753..c4f3065d2e6 100644 --- a/Makefile +++ b/Makefile @@ -1043,6 +1043,8 @@ INPUTS-$(CONFIG_X86) += u-boot-x86-start16.bin u-boot-x86-reset16.bin \ $(if $(CONFIG_SPL_X86_16BIT_INIT),spl/u-boot-spl.bin) \ $(if $(CONFIG_TPL_X86_16BIT_INIT),tpl/u-boot-tpl.bin) +INPUTS-$(CONFIG_ULIB) += libu-boot.so + LDFLAGS_u-boot += $(LDFLAGS_FINAL) # Avoid 'Not enough room for program headers' error on binutils 2.28 onwards. @@ -1843,11 +1845,24 @@ ifeq ($(CONFIG_KALLSYMS),y) $(call cmd,u-boot__) common/system_map.o endif $(call cmd,llcheck,u-boot) - ifeq ($(CONFIG_RISCV),y) @tools/prelink-riscv $@ endif +# Build U-Boot as a shared library +quiet_cmd_libu-boot.so = LD $@ + cmd_libu-boot.so = $(CC) -shared -o $@ -Wl,--build-id=none \ + $(u-boot-init) \ + $(KBUILD_LDFLAGS:%=-Wl,%) $(SANITIZERS) $(LTO_FINAL_LDFLAGS) \ + -Wl,--whole-archive \ + $(filter-out %/main.o,$(u-boot-main)) \ + $(u-boot-keep-syms-lto) \ + -Wl,--no-whole-archive \ + $(PLATFORM_LIBS) -Wl,-Map -Wl,libu-boot.map + +libu-boot.so: $(u-boot-init) $(u-boot-main) $(u-boot-keep-syms-lto) FORCE + $(call if_changed,libu-boot.so) + quiet_cmd_sym ?= SYM $@ cmd_sym ?= $(OBJDUMP) -t $< > $@ u-boot.sym: u-boot FORCE -- 2.43.0