linux-kernel - [PATCH V2] kbuild: add %/built-in.o target in top Makefile

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Date:   Sun,  6 Nov 2016 22:18:32 +0000
From:   Wei Yang <richard.weiyang@...il.com>
To:     mmarek@...e.com
Cc:     linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        Wei Yang <richard.weiyang@...il.com>
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 <richard.weiyang@...il.com>

---
v2
    . 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
-- 
2.5.0