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

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Message-ID: <CACqU3MUVir_hfAtVz24Y7NrQOHAa=WyyHnCN4M6BHLQ294Tdww@mail.gmail.com>
Date:	Fri, 12 Aug 2011 18:17:25 -0400
From:	Arnaud Lacombe <lacombar@...il.com>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Stephen Boyd <sboyd@...eaurora.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

Hi,

On Fri, Aug 12, 2011 at 6:03 PM, Sam Ravnborg <sam@...nborg.org> wrote:
>>
>> I suspect this would have done the job:
>>
>> $(obj)/font.o: $(srctree)/drivers/video/console/font_acorn_8x8.c
>>         $(cmd,cc_o_c)'
>
> I prefer using $(call,shipped) and let kbuild figure out how
> build an .o file from a .c file.
>
> In other words - avoiding use of the internal to Makefile.build
> variables in various places.
>
indeed, but I'd argue that 1) this would not be the first Makefile
using these internal macros (alpha and ia64 are using such construct
for aliasing) and 2) the `cmd_shipped' stuff is as internal than other
functions :-)

I wonder if we could not make kbuild provide an interface for such code-reuse...

 - Arnaud
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