linux-kernel - Re: [RFC] Extending kbuild syntax

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Message-Id: <200710020057.07322.agruen@suse.de>
Date:	Tue, 2 Oct 2007 00:57:07 +0200
From:	Andreas Gruenbacher <agruen@...e.de>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	kbuild devel <kbuild-devel@...ts.sourceforge.net>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] Extending kbuild syntax

On Saturday 29 September 2007 22:11, Sam Ravnborg wrote:
> The second is the more controversial suggestion.
> In several Makefile we have simple if expression of the variants:
> if ($(CONFIG_FOO),y)
>   obj-$(CONFIG_BAR) += fubar.o
> endif

Sometimes substitution looks acceptable:

> -nfsd-$(CONFIG_NFSD)		:= nfsctl.o
> -obj-y				+= $(nfsd-y) $(nfsd-m)
> +obj-y-if-$(CONFIG_NFSD)		+= nfsctl.o

obj-$(CONFIG_NFSD:m=y) += nfsctl.o


But for the nontrivial cases, things get pretty ugly:

> -ifeq ($(CONFIG_PROC_FS),y)
> -obj-$(CONFIG_LOCKDEP) += lockdep_proc.o
> -endif

obj-$(CONFIG_PROC_FS:y=$(CONFIG_LOCKDEP)) += lockdep_proc.o

Andreas
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