xref: /linux/scripts/Makefile.modfinal (revision d642ef71) 
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), $(c_flags)) -c -o $@ $<
27
28%.mod.o: %.mod.c FORCE
29	$(call if_changed_dep,cc_o_c)
30
31quiet_cmd_ld_ko_o = LD [M]  $@
32      cmd_ld_ko_o +=							\
33	$(LD) -r $(KBUILD_LDFLAGS)					\
34		$(KBUILD_LDFLAGS_MODULE) $(LDFLAGS_MODULE)		\
35		-T scripts/module.lds -o $@ $(filter %.o, $^)
36
37quiet_cmd_btf_ko = BTF [M] $@
38      cmd_btf_ko = 							\
39	if [ ! -f vmlinux ]; then					\
40		printf "Skipping BTF generation for %s due to unavailability of vmlinux\n" $@ 1>&2; \
41	else								\
42		LLVM_OBJCOPY="$(OBJCOPY)" $(PAHOLE) -J $(PAHOLE_FLAGS) --btf_base vmlinux $@; \
43		$(RESOLVE_BTFIDS) -b vmlinux $@; 			\
44	fi;
45
46# Same as newer-prereqs, but allows to exclude specified extra dependencies
47newer_prereqs_except = $(filter-out $(PHONY) $(1),$?)
48
49# Same as if_changed, but allows to exclude specified extra dependencies
50if_changed_except = $(if $(call newer_prereqs_except,$(2))$(cmd-check),      \
51	$(cmd);                                                              \
52	printf '%s\n' 'savedcmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:)
53
54# Re-generate module BTFs if either module's .ko or vmlinux changed
55%.ko: %.o %.mod.o scripts/module.lds $(and $(CONFIG_DEBUG_INFO_BTF_MODULES),$(KBUILD_BUILTIN),vmlinux) FORCE
56	+$(call if_changed_except,ld_ko_o,vmlinux)
57ifdef CONFIG_DEBUG_INFO_BTF_MODULES
58	+$(if $(newer-prereqs),$(call cmd,btf_ko))
59endif
60
61targets += $(modules:%.o=%.ko) $(modules:%.o=%.mod.o)
62
63# Add FORCE to the prequisites of a target to force it to be always rebuilt.
64# ---------------------------------------------------------------------------
65
66PHONY += FORCE
67FORCE:
68
69# Read all saved command lines and dependencies for the $(targets) we
70# may be building above, using $(if_changed{,_dep}). As an
71# optimization, we don't need to read them if the target does not
72# exist, we will rebuild anyway in that case.
73
74existing-targets := $(wildcard $(sort $(targets)))
75
76-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
77
78.PHONY: $(PHONY)
79