1# SPDX-License-Identifier: GPL-2.0-only
2
3PHONY := __default
4__default: vmlinux
5
6include include/config/auto.conf
7include $(srctree)/scripts/Kbuild.include
8
9# for c_flags
10include $(srctree)/scripts/Makefile.lib
11
12targets :=
13
14quiet_cmd_cc_o_c = CC      $@
15      cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
16
17%.o: %.c FORCE
18	$(call if_changed_dep,cc_o_c)
19
20ifdef CONFIG_MODULES
21KASAN_SANITIZE_.vmlinux.export.o := n
22KCSAN_SANITIZE_.vmlinux.export.o := n
23GCOV_PROFILE_.vmlinux.export.o := n
24targets += .vmlinux.export.o
25vmlinux: .vmlinux.export.o
26endif
27
28ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
29
30# Final link of vmlinux with optional arch pass after final link
31cmd_link_vmlinux =							\
32	$< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)";		\
33	$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
34
35targets += vmlinux
36vmlinux: scripts/link-vmlinux.sh vmlinux.o $(KBUILD_LDS) FORCE
37	+$(call if_changed_dep,link_vmlinux)
38
39# Add FORCE to the prequisites of a target to force it to be always rebuilt.
40# ---------------------------------------------------------------------------
41
42PHONY += FORCE
43FORCE:
44
45# Read all saved command lines and dependencies for the $(targets) we
46# may be building above, using $(if_changed{,_dep}). As an
47# optimization, we don't need to read them if the target does not
48# exist, we will rebuild anyway in that case.
49
50existing-targets := $(wildcard $(sort $(targets)))
51
52-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
53
54.PHONY: $(PHONY)
55