linux-kernel - Re: [PATCH] ARM: zImage: Skip relinking if nothing changes

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Message-ID: <20110812205520.GL4775@n2100.arm.linux.org.uk>
Date:	Fri, 12 Aug 2011 21:55:20 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Arnaud Lacombe <lacombar@...il.com>
Cc:	Stephen Boyd <sboyd@...eaurora.org>,
	Sam Ravnborg <sam@...nborg.org>, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kbuild@...r.kernel.org
Subject: Re: [PATCH] ARM: zImage: Skip relinking if nothing changes

On Fri, Aug 12, 2011 at 04:48:12PM -0400, Arnaud Lacombe wrote:
> You should be able to avoid the extra copy altogether by doing something ala:
> 
> $(obj)/lib1funcs.o: $(srctree)/arch/arm/lib/lib1funcs.S
>         $(call cmd,as_o_S)
> 
> note that I also remove the $(SRCARCH), as there is no other
> `arch/*/lib/lib1funcs.S' than `arch/arm/lib/lib1funcs.S'

We tried such things, but it results in kbuild arguing over building
lib1funcs.S in arch/arm/lib and arch/arm/boot/compressed.  You end up
with it rebuilding the arch/arm/lib one, followed by a rebuild of the
arch/arm/boot/compressed one.

We've ended up with what we have because its about the only way to get
kbuild to behave.
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