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 $(srctree)/scripts/Makefile.lib 9 10# Link of built-in-fixup.a 11# --------------------------------------------------------------------------- 12 13# '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14 14quiet_cmd_ar_builtin_fixup = AR $@ 15 cmd_ar_builtin_fixup = \ 16 rm -f $@; \ 17 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \ 18 $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt) 19 20targets += built-in-fixup.a 21built-in-fixup.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE 22 $(call if_changed,ar_builtin_fixup) 23 24ifdef CONFIG_LTO_CLANG_THIN_DIST 25 26quiet_cmd_builtin.order = GEN $@ 27 cmd_builtin.order = $(AR) t $< > $@ 28 29targets += builtin.order 30builtin.order: built-in-fixup.a FORCE 31 $(call if_changed,builtin.order) 32 33quiet_cmd_ld_thinlto_index = LD $@ 34 cmd_ld_thinlto_index = \ 35 $(LD) $(KBUILD_LDFLAGS) -r --thinlto-index-only=$@ @$< 36 37targets += vmlinux.thinlto-index 38vmlinux.thinlto-index: builtin.order FORCE 39 $(call if_changed,ld_thinlto_index) 40 41quiet_cmd_ar_vmlinux.a = GEN $@ 42 cmd_ar_vmlinux.a = \ 43 rm -f $@; \ 44 while read -r obj; do \ 45 if grep -Fqx $${obj} $(word 2, $^); then \ 46 echo $${obj%.o}.thinlto-native.o; \ 47 else \ 48 echo $${obj}; \ 49 fi; \ 50 done < $< | xargs $(AR) cDPrS --thin $@ 51 52targets += vmlinux.a 53vmlinux.a: builtin.order vmlinux.thinlto-index FORCE 54 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.thinlto 55 $(call if_changed,ar_vmlinux.a) 56 57else 58 59# vmlinux.a 60# --------------------------------------------------------------------------- 61 62targets += vmlinux.a 63vmlinux.a: built-in-fixup.a FORCE 64 $(call if_changed,copy) 65 66endif 67 68# Add FORCE to the prerequisites of a target to force it to be always rebuilt. 69# --------------------------------------------------------------------------- 70 71PHONY += FORCE 72FORCE: 73 74# Read all saved command lines and dependencies for the $(targets) we 75# may be building above, using $(if_changed{,_dep}). As an 76# optimization, we don't need to read them if the target does not 77# exist, we will rebuild anyway in that case. 78 79existing-targets := $(wildcard $(sort $(targets))) 80 81-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 82 83.PHONY: $(PHONY) 84