linux-kernel - Re: [PATCH] let kbuild mkdir for dir/file.o

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Date:	Sat, 29 Jun 2013 00:44:18 +0200
From:	Michal Marek <mmarek@...e.cz>
To:	张忠山 <zzs0213@...il.com>
Cc:	linux-kbuild@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] let kbuild mkdir for dir/file.o

Hi,

sorry for the late feedback.

Dne 4.6.2013 10:45, 张忠山 napsal(a):
> when add a obj with dir to obj-y, like this
> 
>     obj-y += dir/file.o
> 
> the $(obj)/dir not created, this patch fix this
> 
> this bug caused by commit
>    f5fb976520a53f45f8bbf2e851f16b3b5558d485

Please also include the wonderful explanation including the error
message that you posted separately
(http://permalink.gmane.org/gmane.linux.kbuild.devel/10050). Also,
please CC linux-kernel in addition to linux-kbuild.


> 
> Signed-off-by: 张忠山 <zzs0213@...il.com>
> ---
>  scripts/Makefile.lib |    3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
> index 51bb3de..6bae5a9 100644
> --- a/scripts/Makefile.lib
> +++ b/scripts/Makefile.lib
> @@ -63,7 +63,8 @@ multi-objs   := $(multi-objs-y) $(multi-objs-m)
>  subdir-obj-y := $(filter %/built-in.o, $(obj-y))
>  
>  # $(obj-dirs) is a list of directories that contain object files
> -obj-dirs := $(dir $(multi-objs) $(subdir-obj-y))
> +__subdir-obj-y := $(foreach o,$(obj-y),$(if $(filter-out $(o),$(notdir $(o))),$(o)))

This complicated filter returns entries from $(obj-y) that contain a
slash, is that correct? If so, is it really necessary? Why not simply
add whole $(obj-y) to $(obj-dirs) and be done? $(multi-objs) is also
added without any filtering.

> +obj-dirs := $(dir $(multi-objs) $(__subdir-obj-y))


thanks,
Michal
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