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From: Andi Kleen <ak@suse.de>
Subject: rebuilding object files from asm files
Date: Wed, 20 Feb 2008 19:12:00 +0100
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To: sam@ravnborg.org
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Here's a small kbuild quirk I noticed on 2.6.25rc2. I tried to rebuild
the obj file of a assembler file (.S) with make path/to/file.o.

Normally when I do this for .o file only its dependencies and 
and the object file are built as I expect.

But with an assembler file (like arch/x86/kernel/head_64.o) kbuild
starts to rebuild everything. 

-Andi