linux-kernel - Re: [Patch 2/8] MIPS: Remove 'TOPDIR' from Makefiles

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Message-ID: <20080101101540.GB28913@uranus.ravnborg.org>
Date:	Tue, 1 Jan 2008 11:15:40 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	WANG Cong <xiyou.wangcong@...il.com>
Cc:	Ralf Baechle <ralf@...ux-mips.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-kbuild@...r.kernel.org, Andrew Morton <akpm@...l.org>,
	linux-mips@...ux-mips.org
Subject: Re: [Patch 2/8] MIPS: Remove 'TOPDIR' from Makefiles

On Tue, Jan 01, 2008 at 03:22:38PM +0800, WANG Cong wrote:
> 
> TOPDIR is obsolete, use objtree instead.
> This patch removes TOPDIR from all Mips Makefiles.
> 
> Cc: Ralf Baechle <ralf@...ux-mips.org>
> Cc: Sam Ravnborg <sam@...nborg.org>
> Signed-off-by: WANG Cong <xiyou.wangcong@...il.com>
> 
> ---
> 
> diff --git a/arch/mips/lasat/image/Makefile b/arch/mips/lasat/image/Makefile
> index 5332449..5196962 100644
> --- a/arch/mips/lasat/image/Makefile
> +++ b/arch/mips/lasat/image/Makefile
> @@ -12,7 +12,7 @@ endif
>  
>  MKLASATIMG = mklasatimg
>  MKLASATIMG_ARCH = mq2,mqpro,sp100,sp200
> -KERNEL_IMAGE = $(TOPDIR)/vmlinux
> +KERNEL_IMAGE = $(objtree)/vmlinux

Current directory when building is $(objtree) so here we should
just skip the use of TOPDIR like this:
> +KERNEL_IMAGE = vmlinux


>  KERNEL_START = $(shell $(NM) $(KERNEL_IMAGE) | grep " _text" | cut -f1 -d\ )
>  KERNEL_ENTRY = $(shell $(NM) $(KERNEL_IMAGE) | grep kernel_entry | cut -f1 -d\ )
>  
> @@ -24,7 +24,7 @@ HEAD_DEFINES := -D_kernel_start=0x$(KERNEL_START) \
>  		-D TIMESTAMP=$(shell date +%s)
>  
>  $(obj)/head.o: $(obj)/head.S $(KERNEL_IMAGE)
> -	$(CC) -fno-pic $(HEAD_DEFINES) -I$(TOPDIR)/include -c -o $@ $<
> +	$(CC) -fno-pic $(HEAD_DEFINES) -I$(objtree)/include -c -o $@ $<
This has never worked with O=.. builds.
The correct fix here is to use:
> +	$(CC) -fno-pic $(HEAD_DEFINES) -Iinclude -Iinclude2 -c -o $@ $<

The -Iinclude2 is only for O=... builds so to keep current
behaviour removing $(TOPDIR)/ would do it.

	Sam
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