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Date: Mon, 31 Mar 2014 22:36:16 +0200
From: Sam Ravnborg <sam@ravnborg.org>
To: Masahiro Yamada <yamada.m@jp.panasonic.com>
Cc: linux-kernel@vger.kernel.org, linux-kbuild@vger.kernel.org
Subject: Re: [PATCH] kbuild: create a build directory automatically for
 out-of-tree build
Message-ID: <20140331203615.GA22334@ravnborg.org>
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On Mon, Mar 31, 2014 at 04:41:36PM +0900, Masahiro Yamada wrote:
> Kbuild supports saving output files in a separate directory.
> But the build directory must be created beforehand. For example,
> 
>   $ mkdir -p dir/to/store/output/files
>   $ make O=dir/to/store/output/files defconfig
> 
> Creating a build directory automatically would be useful.
> 
> Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
> ---
>  Makefile | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/Makefile b/Makefile
> index 575e1f8..35b5b7e 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -120,9 +120,10 @@ ifneq ($(KBUILD_OUTPUT),)
>  # Invoke a second make in the output directory, passing relevant variables
>  # check that the output directory actually exists
>  saved-output := $(KBUILD_OUTPUT)
> -KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
> +KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
> +								&& /bin/pwd)
>  $(if $(KBUILD_OUTPUT),, \
> -     $(error output directory "$(saved-output)" does not exist))
> +     $(error failed to create output directory "$(saved-output)"))
>  
>  PHONY += $(MAKECMDGOALS) sub-make

Hi Masahiro.

In the past I have rejected such patches - but today I fail to recall why.
I did a very quick test-spin on this and worked nicely.

So you get my:

Acked-by: Sam Ravnborg <sam@ravnborg.org>

	Sam