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

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Message-Id: <200909171345.30988.arnd@arndb.de>
Date:	Thu, 17 Sep 2009 13:45:30 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Caveh Jalali <ecaveh@...il.com>
Cc:	sam@...nborg.org, 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=

On Thursday 17 September 2009, Caveh Jalali wrote:

> 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

I think we should no longer have the include2 directory at all with new kernels.

LINUXINCLUDE already contains the right path in theory:

LINUXINCLUDE    := -Iinclude \
                   $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
                   -I$(srctree)/arch/$(hdr-arch)/include               \
                   -include include/linux/autoconf.h

I'm not sure what goes wrong here. What is the gcc command line you see?

	Arnd <><
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