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
21targets += .vmlinux.export.o
22vmlinux: .vmlinux.export.o
23endif
24
25ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
26
27# Final link of vmlinux with optional arch pass after final link
28cmd_link_vmlinux =							\
29	$< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)";		\
30	$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
31
32targets += vmlinux
33vmlinux: scripts/link-vmlinux.sh vmlinux.o $(KBUILD_LDS) FORCE
34	+$(call if_changed_dep,link_vmlinux)
35
36# Add FORCE to the prequisites of a target to force it to be always rebuilt.
37# ---------------------------------------------------------------------------
38
39PHONY += FORCE
40FORCE:
41
42# Read all saved command lines and dependencies for the $(targets) we
43# may be building above, using $(if_changed{,_dep}). As an
44# optimization, we don't need to read them if the target does not
45# exist, we will rebuild anyway in that case.
46
47existing-targets := $(wildcard $(sort $(targets)))
48
49-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
50
51.PHONY: $(PHONY)
52