linux-kernel - can't build modules after clean for powerpc

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Message-ID: <4E4B0D28.7010905@linux.intel.com>
Date:	Tue, 16 Aug 2011 17:36:56 -0700
From:	Darren Hart <dvhart@...ux.intel.com>
To:	"lkml, " <linux-kernel@...r.kernel.org>
CC:	Paul Mackerras <paulus@...ba.org>, Gary Thomas <gary@...assoc.com>,
	"Woodhouse, David" <david.woodhouse@...el.com>
Subject: can't build modules after clean for powerpc

According to the Makefile comments and
Documentation/kconfig/makefile.txt, make clean should leave enough
intact to build modules with:

###
# Cleaning is done on three levels.
# make clean     Delete most generated files
#                Leave enough to build external modules

The following line in the arch/powerpc/Makefile prevents that from working:

KBUILD_LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o

External module compilation fails to link as it can't find
arch/powerpc/lib/crtsavres.o.

It appears from the make logs that crtsavres.o is linked in to
built-in.o, and thus vmlinux. If that is the case, it doesn't seem like
crtsavres.o should need to be singled out. What am I missing here?

If I comment it out:

#KBUILD_LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o

my example module builds successfully.

If it is necessary, then we need a means to instruct the top level
makefile to not delete it during "clean". Is there such a directive?

KBUILD_CLEAN_EXCLUDE_MODULES or something?

Thanks,

-- 
Darren Hart
Intel Open Source Technology Center
Yocto Project - Linux Kernel
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