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Subject[PATCH V2] kbuild: add %/built-in.o target in top Makefile
Current kbuild just supports building built-in.o in second directory level
individually. There is no rule to build those built-in.o targets below
third directory level.

Even current kbuild system could achieve this with rule "%/", while this
not only builds built-in targes but also lib target, extra target and
module objects.

This patch adds the "%/built-in.o" rule so that each built-in.o in the
kernel tree could be the build target, which looks more consistent for the
kbuild system.

Signed-off-by: Wei Yang <>

. add FORCE in prerequest

Makefile | 2 ++
1 file changed, 2 insertions(+)

diff --git a/Makefile b/Makefile
index f97f786..9c65498 100644
--- a/Makefile
+++ b/Makefile
@@ -1638,6 +1638,8 @@ endif
$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
%.symtypes: %.c prepare scripts FORCE
$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
+%/built-in.o: prepare scripts FORCE
+ $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)

# Modules
/: prepare scripts FORCE
 \ /
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