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 | KBUILD_VMLINUX_OBJS := built-in.a $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) | 1291 | KBUILD_VMLINUX_OBJS := built-in.a $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) |
| 1292 | KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) | 1292 | KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) |
| 1293 | 1293 | ||
| 1294 | export KBUILD_VMLINUX_LIBS | 1294 | export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS |
| 1295 | export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds | 1295 | export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds |
| 1296 | 1296 | ||
| 1297 | ifdef CONFIG_TRIM_UNUSED_KSYMS | 1297 | ifdef CONFIG_TRIM_UNUSED_KSYMS |
| @@ -1300,16 +1300,12 @@ ifdef CONFIG_TRIM_UNUSED_KSYMS · 2 unmodified lines | |||
| 1300 | KBUILD_MODULES := y | 1300 | KBUILD_MODULES := y |
| 1301 | endif | 1301 | endif |
| 1302 | 1302 | ||
| 1303 | # '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14 | 1303 | PHONY += vmlinux_a |
| 1304 | quiet_cmd_ar_vmlinux.a = AR $@ | 1304 | vmlinux_a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE |
| 1305 | cmd_ar_vmlinux.a = \ | 1305 | $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.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) | ||
| 1309 | 1306 | ||
| 1310 | targets += vmlinux.a | 1307 | vmlinux.a: vmlinux_a |
| 1311 | vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE | 1308 | @: |
| 1312 | $(call if_changed,ar_vmlinux.a) | ||
| 1313 | 1309 | ||
| 1314 | PHONY += vmlinux_o | 1310 | PHONY += vmlinux_o |
| 1315 | vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) | 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) | ||