Move the build rule for vmlinux.a to a separate file in preparation for supporting distributed builds with Clang ThinLTO.
Unified · Split
| @@ -1291,7 +1291,7 @@ export ARCH_DRIVERS := $(drivers-y) $(drivers-m) · 1290 unmodified lines | ||
| 1291 | 1291 | KBUILD_VMLINUX_OBJS := built-in.a $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) |
| 1292 | 1292 | KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) |
| 1293 | 1293 | |
| 1294 | −export KBUILD_VMLINUX_LIBS | |
| 1294 | +export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS | |
| 1295 | 1295 | export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds |
| 1296 | 1296 | |
| 1297 | 1297 | ifdef CONFIG_TRIM_UNUSED_KSYMS |
| @@ -1300,16 +1300,12 @@ ifdef CONFIG_TRIM_UNUSED_KSYMS · 2 unmodified lines | ||
| 1300 | 1300 | KBUILD_MODULES := y |
| 1301 | 1301 | endif |
| 1302 | 1302 | |
| 1303 | −# '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14 | |
| 1304 | −quiet_cmd_ar_vmlinux.a = AR $@ | |
| 1305 | − cmd_ar_vmlinux.a = \ | |
| 1306 | − rm -f $@; \ | |
| 1307 | − $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \ | |
| 1308 | − $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt) | |
| 1303 | +PHONY += vmlinux_a | |
| 1304 | +vmlinux_a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE | |
| 1305 | + $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_a | |
| 1309 | 1306 | |
| 1310 | −targets += vmlinux.a | |
| 1311 | −vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE | |
| 1312 | − $(call if_changed,ar_vmlinux.a) | |
| 1307 | +vmlinux.a: vmlinux_a | |
| 1308 | + @: | |
| 1313 | 1309 | |
| 1314 | 1310 | PHONY += vmlinux_o |
| 1315 | 1311 | vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) |
| @@ -0,0 +1,46 @@ | ||
| 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) | |