linux-kernel - Re: [PATCH] kbuild: make KBUILD_NOCMDDEP=1 handle empty built-in.o

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Date:	Sun, 15 May 2011 23:07:19 +0530
From:	Rabin Vincent <rabin@....in>
To:	Michal Marek <mmarek@...e.cz>
Cc:	linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org
Subject: Re: [PATCH] kbuild: make KBUILD_NOCMDDEP=1 handle empty built-in.o

On Thu, May 12, 2011 at 19:03, Michal Marek <mmarek@...e.cz> wrote:
> I'm not sure if this is the rigt way to fix it. Kbuild.include should
> not care about obj-*. The problem is that arg-check is always empty with
> KBUILD_NOCMDDEP and if there are no other dependencies, the target will
> not be created, right? IMO we only need to make sure that during the
> first make run, arg-check always expands to non-empty, even with
> KBUILD_NOCMDDEP. So we can drop the $(obj-y) test and do it like this
> (untested), can't we?
>
> diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include
> index c034dd7..be39cd1 100644
> --- a/scripts/Kbuild.include
> +++ b/scripts/Kbuild.include
> @@ -197,6 +197,8 @@ ifneq ($(KBUILD_NOCMDDEP),1)
>  # User may override this check using make KBUILD_NOCMDDEP=1
>  arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \
>                     $(filter-out $(cmd_$@),   $(cmd_$(1))) )
> +else
> +arg-check = $(if $(strip $(cmd_$@)),,1)
>  endif
>
>  # >'< substitution is for echo to work,

This works for me, thanks.

Tested-by: Rabin Vincent <rabin@....in>

> while at it, we should also add KBUILD_NOCMDDEP to
> Documentation/kbuild/kbuild.txt.

I will try to write up something for this.
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