1 # SPDX-License-Identifier: GPL-2.0-only
2
3 PHONY := __default
4 __default: vmlinux
5
6 include include/config/auto.conf
7 include $(srctree)/scripts/Kbuild.include
8
9 # for c_flags
10 include $(srctree)/scripts/Makefile.lib
11
12 targets :=
13
14 quiet_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
20 ifdef CONFIG_MODULES
21 targets += .vmlinux.export.o
22 vmlinux: .vmlinux.export.o
23 endif
24
25 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
26
27 # Final link of vmlinux with optional arch pass after final link
28 cmd_link_vmlinux = \
29 $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \
30 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
31
32 targets += vmlinux
33 vmlinux: scripts/link-vmlinux.sh vmlinux.o $(KBUILD_LDS) FORCE
34 +$(call if_changed_dep,link_vmlinux)
35
36 # Add FORCE to the prerequisites of a target to force it to be always rebuilt.
37 # ---------------------------------------------------------------------------
38
39 PHONY += FORCE
40 FORCE:
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
47 existing-targets := $(wildcard $(sort $(targets)))
48
49 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
50
51 .PHONY: $(PHONY)
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