From: Arnd Bergmann <arnd@arndb.de>
To: Sam Ravnborg <sam@ravnborg.org>
Subject: Re: kbuild now support arch/$ARCH/include - time for ARCHs to convert
Date: Fri, 1 Aug 2008 09:35:04 +0200
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Cc: Paul Mundt <lethal@linux-sh.org>,
       Geert Uytterhoeven <geert@linux-m68k.org>,
       David Howells <dhowells@redhat.com>, Greg Ungerer <gerg@snapgear.com>,
       linux arch <linux-arch@vger.kernel.org>,
       LKML <linux-kernel@vger.kernel.org>,
       Linux/m68k <linux-m68k@vger.kernel.org>,
       uClinux list <uclinux-dev@uclinux.org>
References: <200807300907.25186.arnd@arndb.de> <200807312147.25837.arnd@arndb.de> <20080731201352.GB25305@uranus.ravnborg.org>
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On Thursday 31 July 2008, Sam Ravnborg wrote:
> > #ifdef __KERNEL__
> > #ifdef CONFIG_MMU
> > #include "${BASE}_mmu.h"
> > #else
> > #include "${BASE}_nommu.h"
> > #endif
> > #else
> > #include "${BASE}_mmu.h"
> > #endif
> > EOF
> > }
> 
> This will leak a CONFIG_ symbol if the header file
> is exported. Can we do it with a gcc defined symbol?
> [See how I did it for sparc for instance]

Is there a compiler defined symbol for this? I thought the tool
chain was identical. Do you think my #ifdef __KERNEL__ does
not do what I wanted it to do? It should make sure that
user space always sees the _mmu variant.

	Arnd <><
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