xref: /openbmc/linux/scripts/Makefile.modfinal (revision f21e49be) 
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 and mod-prelink-ext
13include $(srctree)/scripts/Makefile.lib
14
15# find all modules listed in modules.order
16modules := $(sort $(shell cat $(MODORDER)))
17
18__modfinal: $(modules)
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), $(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] $@
41      cmd_btf_ko = 							\
42	if [ -f vmlinux ]; then						\
43		LLVM_OBJCOPY="$(OBJCOPY)" $(PAHOLE) -J $(PAHOLE_FLAGS) --btf_base vmlinux $@; \
44		$(RESOLVE_BTFIDS) -b vmlinux $@; 			\
45	else								\
46		printf "Skipping BTF generation for %s due to unavailability of vmlinux\n" $@ 1>&2; \
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	$(cmd);                                                              \
55	printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:)
56
57
58# Re-generate module BTFs if either module's .ko or vmlinux changed
59$(modules): %.ko: %$(mod-prelink-ext).o %.mod.o scripts/module.lds $(if $(KBUILD_BUILTIN),vmlinux) FORCE
60	+$(call if_changed_except,ld_ko_o,vmlinux)
61ifdef CONFIG_DEBUG_INFO_BTF_MODULES
62	+$(if $(newer-prereqs),$(call cmd,btf_ko))
63endif
64
65targets += $(modules) $(modules:.ko=.mod.o)
66
67# Add FORCE to the prequisites of a target to force it to be always rebuilt.
68# ---------------------------------------------------------------------------
69
70PHONY += FORCE
71FORCE:
72
73# Read all saved command lines and dependencies for the $(targets) we
74# may be building above, using $(if_changed{,_dep}). As an
75# optimization, we don't need to read them if the target does not
76# exist, we will rebuild anyway in that case.
77
78existing-targets := $(wildcard $(sort $(targets)))
79
80-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
81
82.PHONY: $(PHONY)
83