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

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Date:	Tue, 1 Jan 2008 18:57:54 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Andreas Schwab <schwab@...e.de>
Cc:	WANG Cong <xiyou.wangcong@...il.com>,
	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 02:44:48PM +0100, Andreas Schwab wrote:
> Sam Ravnborg <sam@...nborg.org> writes:
> 
> >> @@ -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.
> 
> Shouldn't that use $(LINUXINCLUDE), or $(KBUILD_CPPFLAGS)?
It would be better to use $(LINUXINCLUDE) as we then pull in all config
symbols too and do not have to hardcode kbuild internal names (include2).

As for the use of KBUILD_CPPFLAGS at present the usage is not consistent
across the architectures. Why does arm for example say:
KBUILD_CPPFLAGS       += -mbig-endian

This looks like a KBUILD_CFLAGS thing to me.

So we should preferably stick with LINUXINCLUDE for now.

	Sam
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