| 1 | # SPDX-License-Identifier: GPL-2.0-only |
| 2 | |
| 3 | PHONY := __default |
| 4 | __default: vmlinux.a |
| 5 | |
| 6 | include include/config/auto.conf |
| 7 | include $(srctree)/scripts/Kbuild.include |
| 8 | include $(srctree)/scripts/Makefile.lib |
| 9 | |
| 10 | # Link of built-in-fixup.a |
| 11 | # --------------------------------------------------------------------------- |
| 12 | |
| 13 | quiet_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 | |
| 19 | targets += built-in-fixup.a |
| 20 | built-in-fixup.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE |
| 21 | $(call if_changed,ar_builtin_fixup) |
| 22 | |
| 23 | ifdef CONFIG_LTO_CLANG_THIN_DIST |
| 24 | |
| 25 | quiet_cmd_builtin.order = GEN $@ |
| 26 | cmd_builtin.order = $(AR) t $< > $@ |
| 27 | |
| 28 | targets += builtin.order |
| 29 | builtin.order: built-in-fixup.a FORCE |
| 30 | $(call if_changed,builtin.order) |
| 31 | |
| 32 | quiet_cmd_ld_thinlto_index = LD $@ |
| 33 | cmd_ld_thinlto_index = \ |
| 34 | $(LD) $(KBUILD_LDFLAGS) -r --thinlto-index-only=$@ @$< |
| 35 | |
| 36 | targets += vmlinux.thinlto-index |
| 37 | vmlinux.thinlto-index: builtin.order FORCE |
| 38 | $(call if_changed,ld_thinlto_index) |
| 39 | |
| 40 | quiet_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 | |
| 51 | targets += vmlinux.a |
| 52 | vmlinux.a: builtin.order vmlinux.thinlto-index FORCE |
| 53 | $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.thinlto |
| 54 | $(call if_changed,ar_vmlinux.a) |
| 55 | |
| 56 | else |
| 57 | |
| 58 | # vmlinux.a |
| 59 | # --------------------------------------------------------------------------- |
| 60 | |
| 61 | targets += vmlinux.a |
| 62 | vmlinux.a: built-in-fixup.a FORCE |
| 63 | $(call if_changed,copy) |
| 64 | |
| 65 | endif |
| 66 | |
| 67 | # Add FORCE to the prerequisites of a target to force it to be always rebuilt. |
| 68 | # --------------------------------------------------------------------------- |
| 69 | |
| 70 | PHONY += FORCE |
| 71 | FORCE: |
| 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 | |
| 78 | existing-targets := $(wildcard $(sort $(targets))) |
| 79 | |
| 80 | -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) |
| 81 | |
| 82 | .PHONY: $(PHONY) |