# SPDX-License-Identifier: GPL-2.0-only PHONY := __default__default: vmlinux.o include include/config/auto.confinclude $(srctree)/scripts/Kbuild.include # for objtoolinclude $(srctree)/scripts/Makefile.lib # Generate a linker script to ensure correct ordering of initcalls for Clang LTO# --------------------------------------------------------------------------- quiet_cmd_gen_initcalls_lds = GEN     $@      cmd_gen_initcalls_lds = \	$(PYTHON3) $(srctree)/scripts/jobserver-exec \	$(PERL) $(real-prereqs) > $@ .tmp_initcalls.lds: $(srctree)/scripts/generate_initcall_order.pl \		$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) FORCE	$(call if_changed,gen_initcalls_lds) targets := .tmp_initcalls.lds ifdef CONFIG_LTO_CLANGinitcalls-lds := .tmp_initcalls.ldsendif # objtool for vmlinux.o# ---------------------------------------------------------------------------## For LTO and IBT, objtool doesn't run on individual translation units.# Run everything on vmlinux instead. objtool-enabled := $(or $(delay-objtool),$(CONFIG_NOINSTR_VALIDATION)) # Reuse objtool_args defined in scripts/Makefile.lib if LTO or IBT is enabled.## Add some more flags as needed.# --no-unreachable and --link might be added twice, but it is fine.## Expand objtool_args to a simple variable to avoid circular reference. objtool_args := \	$(if $(delay-objtool),$(objtool_args)) \	$(if $(CONFIG_NOINSTR_VALIDATION), --noinstr) \	$(if $(CONFIG_GCOV_KERNEL), --no-unreachable) \	--link # Link of vmlinux.o used for section mismatch analysis# --------------------------------------------------------------------------- quiet_cmd_ld_vmlinux.o = LD      $@      cmd_ld_vmlinux.o = \	$(LD) ${KBUILD_LDFLAGS} -r -o $@ \	$(addprefix -T , $(initcalls-lds)) \	--whole-archive $(KBUILD_VMLINUX_OBJS) --no-whole-archive \	--start-group $(KBUILD_VMLINUX_LIBS) --end-group \	$(cmd_objtool) define rule_ld_vmlinux.o	$(call cmd_and_savecmd,ld_vmlinux.o)	$(call cmd,gen_objtooldep)endef vmlinux.o: $(initcalls-lds) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) FORCE	$(call if_changed_rule,ld_vmlinux.o) targets += vmlinux.o # Add FORCE to the prequisites of a target to force it to be always rebuilt.# --------------------------------------------------------------------------- PHONY += FORCEFORCE: # Read all saved command lines and dependencies for the $(targets) we# may be building above, using $(if_changed{,_dep}). As an# optimization, we don't need to read them if the target does not# exist, we will rebuild anyway in that case. existing-targets := $(wildcard $(sort $(targets))) -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) .PHONY: $(PHONY)