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1198c9c689
On powerpc, we would like to be able to make a pass on vmlinux.o and generate a new object file to be linked into vmlinux. Add a generic pass in Makefile.vmlinux that architectures can use for this purpose. Architectures need to select CONFIG_ARCH_WANTS_PRE_LINK_VMLINUX and must provide arch/<arch>/tools/Makefile with .arch.vmlinux.o target, which will be invoked prior to the final vmlinux link step. Acked-by: Masahiro Yamada <masahiroy@kernel.org> Signed-off-by: Naveen N Rao <naveen@kernel.org> Signed-off-by: Hari Bathini <hbathini@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://patch.msgid.link/20241030070850.1361304-12-hbathini@linux.ibm.com
77 lines
2.1 KiB
Makefile
77 lines
2.1 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0-only
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PHONY := __default
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__default: vmlinux
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include include/config/auto.conf
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include $(srctree)/scripts/Kbuild.include
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# for c_flags
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include $(srctree)/scripts/Makefile.lib
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targets :=
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quiet_cmd_cc_o_c = CC $@
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cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
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%.o: %.c FORCE
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$(call if_changed_dep,cc_o_c)
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ifdef CONFIG_MODULES
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targets += .vmlinux.export.o
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vmlinux: .vmlinux.export.o
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endif
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ifdef CONFIG_ARCH_WANTS_PRE_LINK_VMLINUX
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vmlinux: arch/$(SRCARCH)/tools/vmlinux.arch.o
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arch/$(SRCARCH)/tools/vmlinux.arch.o: vmlinux.o FORCE
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$(Q)$(MAKE) $(build)=arch/$(SRCARCH)/tools $@
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endif
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ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
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# Final link of vmlinux with optional arch pass after final link
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cmd_link_vmlinux = \
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$< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \
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$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
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targets += vmlinux
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vmlinux: scripts/link-vmlinux.sh vmlinux.o $(KBUILD_LDS) FORCE
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+$(call if_changed_dep,link_vmlinux)
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# module.builtin.ranges
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# ---------------------------------------------------------------------------
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ifdef CONFIG_BUILTIN_MODULE_RANGES
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__default: modules.builtin.ranges
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quiet_cmd_modules_builtin_ranges = GEN $@
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cmd_modules_builtin_ranges = gawk -f $(real-prereqs) > $@
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targets += modules.builtin.ranges
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modules.builtin.ranges: $(srctree)/scripts/generate_builtin_ranges.awk \
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modules.builtin vmlinux.map vmlinux.o.map FORCE
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$(call if_changed,modules_builtin_ranges)
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vmlinux.map: vmlinux
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@:
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endif
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# Add FORCE to the prerequisites of a target to force it to be always rebuilt.
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# ---------------------------------------------------------------------------
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PHONY += FORCE
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FORCE:
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# Read all saved command lines and dependencies for the $(targets) we
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# may be building above, using $(if_changed{,_dep}). As an
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# optimization, we don't need to read them if the target does not
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# exist, we will rebuild anyway in that case.
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existing-targets := $(wildcard $(sort $(targets)))
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-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
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.PHONY: $(PHONY)
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