In the current tip of git tree. If I do a allmodconfig full build, then follow by a "make" again without changing any code in the tree. There are some object will always get rebuild. e.g. eboot.o. I use "make V=2", it shows that the rebuild is due to some object file not in $(targets). I did not understand the $(targets) very well, the Kbuild.include mention that It is likely a bug in the kbuild if that happen.
I add them in the $(targets) and that seems avoid the unnecessary rebuild of several objects. The second "make" has fewer output. The clean rebuild seems works fine too. Chris
kbuild-avoid-rebuild-some-object.patch
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