1# SPDX-License-Identifier: GPL-2.0-only 2 3PHONY := __default 4__default: vmlinux.a 5 6include include/config/auto.conf 7include $(srctree)/scripts/Kbuild.include 8include $(srctree)/scripts/Makefile.lib 9 10# Link of built-in-fixup.a 11# --------------------------------------------------------------------------- 12 13quiet_cmd_ar_builtin_fixup = AR $@ 14 cmd_ar_builtin_fixup = \ 15 rm -f $@; \ 16 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \ 17 $(AR) mPi $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt) 18 19targets += built-in-fixup.a 20built-in-fixup.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE 21 $(call if_changed,ar_builtin_fixup) 22 23ifdef CONFIG_LTO_CLANG_THIN_DIST 24 25quiet_cmd_builtin.order = GEN $@ 26 cmd_builtin.order = $(AR) t $< > $@ 27 28targets += builtin.order 29builtin.order: built-in-fixup.a FORCE 30 $(call if_changed,builtin.order) 31 32quiet_cmd_ld_thinlto_index = LD $@ 33 cmd_ld_thinlto_index = \ 34 $(LD) $(KBUILD_LDFLAGS) -r --thinlto-index-only=$@ @$< 35 36targets += vmlinux.thinlto-index 37vmlinux.thinlto-index: builtin.order FORCE 38 $(call if_changed,ld_thinlto_index) 39 40quiet_cmd_ar_vmlinux.a = GEN $@ 41 cmd_ar_vmlinux.a = \ 42 rm -f $@; \ 43 while read -r obj; do \ 44 if grep -Fqx $${obj} $(word 2, $^); then \ 45 echo $${obj%.o}.thinlto-native.o; \ 46 else \ 47 echo $${obj}; \ 48 fi; \ 49 done < $< | xargs $(AR) cDPrS --thin $@ 50 51targets += vmlinux.a 52vmlinux.a: builtin.order vmlinux.thinlto-index FORCE 53 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.thinlto 54 $(call if_changed,ar_vmlinux.a) 55 56else 57 58# vmlinux.a 59# --------------------------------------------------------------------------- 60 61targets += vmlinux.a 62vmlinux.a: built-in-fixup.a FORCE 63 $(call if_changed,copy) 64 65endif 66 67# Add FORCE to the prerequisites of a target to force it to be always rebuilt. 68# --------------------------------------------------------------------------- 69 70PHONY += FORCE 71FORCE: 72 73# Read all saved command lines and dependencies for the $(targets) we 74# may be building above, using $(if_changed{,_dep}). As an 75# optimization, we don't need to read them if the target does not 76# exist, we will rebuild anyway in that case. 77 78existing-targets := $(wildcard $(sort $(targets))) 79 80-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 81 82.PHONY: $(PHONY) 83