1# SPDX-License-Identifier: GPL-2.0-only 2# =========================================================================== 3# Module final link 4# =========================================================================== 5 6PHONY := __modfinal 7__modfinal: 8 9include include/config/auto.conf 10include $(srctree)/scripts/Kbuild.include 11 12# for c_flags 13include $(srctree)/scripts/Makefile.lib 14 15# find all modules listed in modules.order 16modules := $(call read-file, $(MODORDER)) 17 18__modfinal: $(modules:%.o=%.ko) 19 @: 20 21# modname and part-of-module are set to make c_flags define proper module flags 22modname = $(notdir $(@:.mod.o=)) 23part-of-module = y 24 25quiet_cmd_cc_o_c = CC [M] $@ 26 cmd_cc_o_c = $(CC) $(filter-out $(CC_FLAGS_CFI) $(CFLAGS_GCOV) $(CFLAGS_KCSAN), $(c_flags)) -c -o $@ $< 27 28%.mod.o: %.mod.c FORCE 29 $(call if_changed_dep,cc_o_c) 30 31ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 32 33quiet_cmd_ld_ko_o = LD [M] $@ 34 cmd_ld_ko_o += \ 35 $(LD) -r $(KBUILD_LDFLAGS) \ 36 $(KBUILD_LDFLAGS_MODULE) $(LDFLAGS_MODULE) \ 37 -T scripts/module.lds -o $@ $(filter %.o, $^); \ 38 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 39 40quiet_cmd_btf_ko = BTF [M] $@ 41 cmd_btf_ko = \ 42 if [ ! -f vmlinux ]; then \ 43 printf "Skipping BTF generation for %s due to unavailability of vmlinux\n" $@ 1>&2; \ 44 else \ 45 LLVM_OBJCOPY="$(OBJCOPY)" $(PAHOLE) -J $(PAHOLE_FLAGS) --btf_base vmlinux $@; \ 46 $(RESOLVE_BTFIDS) -b vmlinux $@; \ 47 fi; 48 49# Same as newer-prereqs, but allows to exclude specified extra dependencies 50newer_prereqs_except = $(filter-out $(PHONY) $(1),$?) 51 52# Same as if_changed, but allows to exclude specified extra dependencies 53if_changed_except = $(if $(call newer_prereqs_except,$(2))$(cmd-check), \ 54 $(cmd); \ 55 printf '%s\n' 'savedcmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:) 56 57# Re-generate module BTFs if either module's .ko or vmlinux changed 58%.ko: %.o %.mod.o scripts/module.lds $(and $(CONFIG_DEBUG_INFO_BTF_MODULES),$(KBUILD_BUILTIN),vmlinux) FORCE 59 +$(call if_changed_except,ld_ko_o,vmlinux) 60ifdef CONFIG_DEBUG_INFO_BTF_MODULES 61 +$(if $(newer-prereqs),$(call cmd,btf_ko)) 62endif 63 64targets += $(modules:%.o=%.ko) $(modules:%.o=%.mod.o) 65 66# Add FORCE to the prequisites of a target to force it to be always rebuilt. 67# --------------------------------------------------------------------------- 68 69PHONY += FORCE 70FORCE: 71 72# Read all saved command lines and dependencies for the $(targets) we 73# may be building above, using $(if_changed{,_dep}). As an 74# optimization, we don't need to read them if the target does not 75# exist, we will rebuild anyway in that case. 76 77existing-targets := $(wildcard $(sort $(targets))) 78 79-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 80 81.PHONY: $(PHONY) 82