linux-kernel - Re: [patch] Makefile: can't build modules outside the kernel tree if it was built using O=

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Date:	Wed, 16 Sep 2009 21:40:57 -0700
From:	Caveh Jalali <ecaveh@...il.com>
To:	sam@...nborg.org
Cc:	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch] Makefile: can't build modules outside the kernel tree if 
	it was built using O=

it's known good in 2.6.25, borked in 2.6.31.  i didn't track down
the kernel version number where the offending commit showed up.

anyway, here's my SOB:

Signed-off-by: Caveh Jalali <ecaveh@...il.com>

On Wed, Sep 16, 2009 at 7:30 PM, Caveh Jalali <ecaveh@...il.com> wrote:
> in 2.6.31, it is no longer possible to build kernel modules for some platforms
> (the ones that need include2) outside the kernel src tree if the
> src tree was built using O= to specify an alternate directory for the
> build output.
>
> i think this broke with the following commit:
>
> commit b8b572e1015f81b4e748417be2629dfe51ab99f9
> Author: Stephen Rothwell <sfr@...b.auug.org.au>
> Date:   Fri Aug 1 15:20:30 2008 +1000
>
>    powerpc: Move include files to arch/powerpc/include/asm
>
>
> when the platform specific include directories were shuffled around
> without updating the
> top level Makefile.  however, i think this FAIL is generic, and not
> limited to powerpc.
> here's a patch to the top level Makefile to teach it about the shuffled files:
>
>
> --- /local/caveh/linux/linux-2.6.31/Makefile    2009-09-09
> 15:13:59.000000000 -0700
> +++ Makefile    2009-09-16 12:23:05.000000000 -0700
> @@ -958,9 +958,9 @@ ifneq ($(KBUILD_SRC),)
>                 echo "  in the '$(srctree)' directory.";\
>                 /bin/false; \
>         fi;
> -       $(Q)if [ ! -d include2 ]; then                                  \
> -           mkdir -p include2;                                          \
> -           ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm;     \
> +       $(Q)if [ ! -d include2 ]; then                                   \
> +           mkdir -p include2;                                           \
> +           ln -fsn $(srctree)/arch/$(SRCARCH)/include/asm include2/asm; \
>         fi
>  endif
>



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