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

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Message-ID: <20110813063409.GA29111@merkur.ravnborg.org>
Date:	Sat, 13 Aug 2011 08:34:09 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	Arnaud Lacombe <lacombar@...il.com>
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

On Fri, Aug 12, 2011 at 06:17:25PM -0400, Arnaud Lacombe wrote:
> 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 :-)
A quick grep in Documentation/kbuild will show that only the shipped
variant is documented.

We could implement a general copy command - this is needed in some places
like this.

	Sam
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