Commit 2441e78b authored by Nicolas Pitre's avatar Nicolas Pitre Committed by Michal Marek
Browse files

kbuild: better abstract vmlinux sequential prerequisites 



When CONFIG_TRIM_UNUSED_KSYMS=y and CONFIG_BUILD_DOCSRC=y it is possible
to get the following error:

ERROR: "cn_del_callback" [Documentation/connector/cn_test.ko] undefined!
ERROR: "cn_add_callback" [Documentation/connector/cn_test.ko] undefined!
ERROR: "cn_netlink_send" [Documentation/connector/cn_test.ko] undefined!
../scripts/Makefile.modpost:91: recipe for target '__modpost' failed

It is not sufficient to do "vmlinux-dirs += Documentation" as this also
depends on the headers_check target, and all of this needs to be done
before adjust_autoksyms.sh is executed.

Let's sort this out by gathering those sequential prerequisites in a make
target of their own, separate from the vmlinux target. And by doing so,
the special autoksyms_recursive target is no longer needed.

Signed-off-by: default avatarNicolas Pitre <nico@linaro.org>
Acked-by: default avatarRandy Dunlap <rdunlap@infradead.org>
Tested-by: default avatarRandy Dunlap <rdunlap@infradead.org>
parent ba79d401

Makefile

+15 −16
Original line number Diff line number Diff line
@@ -926,17 +926,11 @@ export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Doc 


vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)



# Final link of vmlinux

      cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)

quiet_cmd_link-vmlinux = LINK    $@



# Include targets which we want to

# execute if the rest of the kernel build went well.

vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE

ifdef CONFIG_TRIM_UNUSED_KSYMS

	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \

	  "$(MAKE) KBUILD_MODULES=1 -f $(srctree)/Makefile autoksyms_recursive"

endif

# Include targets which we want to execute sequentially if the rest of the

# kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be

# evaluated more than once.

PHONY += vmlinux_prereq

vmlinux_prereq: $(vmlinux-deps) FORCE

ifdef CONFIG_HEADERS_CHECK

	$(Q)$(MAKE) -f $(srctree)/Makefile headers_check

endif
@@ -946,17 +940,22 @@ endif 
ifdef CONFIG_GDB_SCRIPTS

	$(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py

endif

	+$(call if_changed,link-vmlinux)



autoksyms_recursive: $(vmlinux-deps)

ifdef CONFIG_TRIM_UNUSED_KSYMS

	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \

	  "$(MAKE) KBUILD_MODULES=1 -f $(srctree)/Makefile autoksyms_recursive"

PHONY += autoksyms_recursive

	  "$(MAKE) KBUILD_MODULES=1 -f $(srctree)/Makefile vmlinux_prereq"

endif



# standalone target for easier testing

include/generated/autoksyms.h: FORCE

	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true



# Final link of vmlinux

      cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)

quiet_cmd_link-vmlinux = LINK    $@



vmlinux: scripts/link-vmlinux.sh vmlinux_prereq FORCE

	+$(call if_changed,link-vmlinux)



# Build samples along the rest of the kernel

ifdef CONFIG_SAMPLES

vmlinux-dirs += samples

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