Move the build rule for vmlinux.a to a separate file in preparation for supporting distributed builds with Clang ThinLTO.
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| 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 $(srctree)/scripts/Makefile.lib | |
| 9 | + | |
| 10 | +# Link of built-in-fixup.a | |
| 11 | +# --------------------------------------------------------------------------- | |
| 12 | + | |
| 13 | +# '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14 | |
| 14 | +quiet_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 | + | |
| 20 | +targets += built-in-fixup.a | |
| 21 | +built-in-fixup.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE | |
| 22 | + $(call if_changed,ar_builtin_fixup) | |
| 23 | + | |
| 24 | +# vmlinux.a | |
| 25 | +# --------------------------------------------------------------------------- | |
| 26 | + | |
| 27 | +targets += vmlinux.a | |
| 28 | +vmlinux.a: built-in-fixup.a FORCE | |
| 29 | + $(call if_changed,copy) | |
| 30 | + | |
| 31 | +# Add FORCE to the prerequisites of a target to force it to be always rebuilt. | |
| 32 | +# --------------------------------------------------------------------------- | |
| 33 | + | |
| 34 | +PHONY += FORCE | |
| 35 | +FORCE: | |
| 36 | + | |
| 37 | +# Read all saved command lines and dependencies for the $(targets) we | |
| 38 | +# may be building above, using $(if_changed{,_dep}). As an | |
| 39 | +# optimization, we don't need to read them if the target does not | |
| 40 | +# exist, we will rebuild anyway in that case. | |
| 41 | + | |
| 42 | +existing-targets := $(wildcard $(sort $(targets))) | |
| 43 | + | |
| 44 | +-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) | |
| 45 | + | |
| 46 | +.PHONY: $(PHONY) | |