linux-kernel - Re: [PATCH] kbuild: let object files depend on recordmcount instead of its sources

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Date:	Fri, 7 Oct 2011 20:04:15 +0200
From:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Michal Marek <mmarek@...e.cz>, linux-kernel@...r.kernel.org,
	linux-kbuild@...r.kernel.org
Subject: Re: [PATCH] kbuild: let object files depend on recordmcount instead
 of its sources

On Fri, Oct 07, 2011 at 12:31:33PM -0400, Steven Rostedt wrote:
> On Fri, 2011-10-07 at 15:19 +0200, Uwe Kleine-König wrote:
> > This has the upside that distributions only have to ship the recordmcount
> > binary to allow building modules instead of recordmcount and it's sources.
> > 
> > Make still notices that the object files need to be rebuilt when
> > recordmcount's sources change.
> 
> This doesn't work. Try it on a clean build:
> 
>   HOSTCC  scripts/basic/fixdep
>   GEN     /home/rostedt/work/git/tmp/Makefile
>   HOSTCC  scripts/kconfig/conf.o
>   SHIPPED scripts/kconfig/zconf.tab.c
>   SHIPPED scripts/kconfig/lex.zconf.c
>   SHIPPED scripts/kconfig/zconf.hash.c
>   HOSTCC  scripts/kconfig/zconf.tab.o
>   HOSTLD  scripts/kconfig/conf
> scripts/kconfig/conf --silentoldconfig Kconfig
>   Using /home/rostedt/work/git/linux-rt.git as source for kernel
>   GEN     /home/rostedt/work/git/tmp/Makefile
>   CHK     include/linux/version.h
>   UPD     include/linux/version.h
>   CHK     include/generated/utsrelease.h
>   UPD     include/generated/utsrelease.h
>   CC      kernel/bounds.s
>   GEN     include/generated/bounds.h
>   CC      arch/x86/kernel/asm-offsets.s
>   GEN     include/generated/asm-offsets.h
>   CALL    /home/rostedt/work/git/linux-rt.git/scripts/checksyscalls.sh
> make[3]: *** No rule to make target `scripts/mod/empty.o', needed by `scripts/mod/elfconfig.h'.  Stop.
> make[2]: *** [scripts/mod] Error 2
> make[1]: *** [scripts] Error 2
> make: *** [sub-make] Error 2
Works for me with 3ee72ca + my patch doing:

	make -C /path/to/my/linux/src/dir defconfig O=$(pwd)
	make -j 6

If you tell me your exact setup I'll try to reproduce and fix.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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