On Fri, 22 Apr 2016, Nicolas Pitre wrote:
> On Fri, 22 Apr 2016, Randy Dunlap wrote:
>
> > Yes, this patch helps, but I think there is still a problem.
> > I think that trim needs to be done after CONFIG_BUILD_DOCSRC and possibly
> > after CONFIG_SAMPLES are built.
>
> The later is already taken care of with commit dd92478a15.
>
> > At least CONFIG_BUILD_DOCSRC seems to
> > cause this error:
> >
> > Setup is 16508 bytes (padded to 16896 bytes).
> > System is 6125 kB
> > CRC 8aa70f94
> > Kernel: arch/x86/boot/bzImage is ready (#9)
> > 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
> > make[2]: *** [__modpost] Error 1
>
> This one is indeed a problem.
Please try the following:
----- >8
Subject: [PATCH] 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: Nicolas Pitre <n...@linaro.org>
diff --git a/Makefile b/Makefile
index e9ad498238..3f1eb6a1bf 100644
--- a/Makefile
+++ b/Makefile
@@ -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
