1# SPDX-License-Identifier: GPL-2.0-only 2 3PHONY := __default 4__default: vmlinux.o 5 6include include/config/auto.conf 7include $(srctree)/scripts/Kbuild.include 8 9# Generate a linker script to ensure correct ordering of initcalls for Clang LTO 10# --------------------------------------------------------------------------- 11 12quiet_cmd_gen_initcalls_lds = GEN $@ 13 cmd_gen_initcalls_lds = \ 14 $(PYTHON3) $(srctree)/scripts/jobserver-exec \ 15 $(PERL) $(real-prereqs) > $@ 16 17.tmp_initcalls.lds: $(srctree)/scripts/generate_initcall_order.pl \ 18 $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) FORCE 19 $(call if_changed,gen_initcalls_lds) 20 21targets := .tmp_initcalls.lds 22 23ifdef CONFIG_LTO_CLANG 24initcalls-lds := .tmp_initcalls.lds 25endif 26 27# Link of vmlinux.o used for section mismatch analysis 28# --------------------------------------------------------------------------- 29 30quiet_cmd_ld_vmlinux.o = LD $@ 31 cmd_ld_vmlinux.o = \ 32 $(LD) ${KBUILD_LDFLAGS} -r -o $@ \ 33 $(addprefix -T , $(initcalls-lds)) \ 34 --whole-archive $(KBUILD_VMLINUX_OBJS) --no-whole-archive \ 35 --start-group $(KBUILD_VMLINUX_LIBS) --end-group \ 36 37define rule_ld_vmlinux.o 38 $(call cmd_and_savecmd,ld_vmlinux.o) 39endef 40 41vmlinux.o: $(initcalls-lds) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) FORCE 42 $(call if_changed_rule,ld_vmlinux.o) 43 44targets += vmlinux.o 45 46# Add FORCE to the prequisites of a target to force it to be always rebuilt. 47# --------------------------------------------------------------------------- 48 49PHONY += FORCE 50FORCE: 51 52# Read all saved command lines and dependencies for the $(targets) we 53# may be building above, using $(if_changed{,_dep}). As an 54# optimization, we don't need to read them if the target does not 55# exist, we will rebuild anyway in that case. 56 57existing-targets := $(wildcard $(sort $(targets))) 58 59-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 60 61.PHONY: $(PHONY) 62