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From: Gabriel Paubert <paubert@iram.es>
Date: Tue, 2 May 2006 00:00:35 +0200
To: Kumar Gala <galak@kernel.crashing.org>
Subject: Re: DTC/dts modifications
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On Mon, May 01, 2006 at 03:28:34PM -0500, Kumar Gala wrote:
> 
> Cool, here's an invocation that seems to work well.  Not sure what  
> causes linux = 1 (thus I need the -U linux).  Also address the line  
> information that is normally spit out.
> 
> cpp -U linux -P -x assembler-with-cpp foo.dts

Try to add the -undef parameter:

`-undef'
     Do not predefine any system-specific or GCC-specific macros.  The
     standard predefined macros remain defined.

On this machine, the number of lines from:

cpp -dM -x assembler-with-cpp /dev/null

drops from 83 (among which linux, unix, PPC, and powerpc do not start
with underscores) to 5(!) when I add the -undef option. The only ones
left are:

#define __linux__ 1
#define __STDC_HOSTED__ 1
#define __unix__ 1
#define __gnu_linux__ 1
#define __ASSEMBLER__ 1

but at least they all have leading and trailing double underscores.

	Regards,
	Gabriel