linux-kernel - Re: dtc: import latest upstream dtc

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Date:	Sun, 14 Oct 2012 10:16:41 +1000
From:	David Gibson <david@...son.dropbear.id.au>
To:	Segher Boessenkool <segher@...nel.crashing.org>
Cc:	Stephen Warren <swarren@...dotorg.org>,
	Scott Wood <scottwood@...escale.com>,
	Michal Marek <mmarek@...e.cz>,
	devicetree-discuss@...ts.ozlabs.org,
	Stephen Warren <swarren@...dia.com>,
	linux-kernel@...r.kernel.org
Subject: Re: dtc: import latest upstream dtc

On Sat, Oct 13, 2012 at 03:42:35PM +0200, Segher Boessenkool wrote:
> >Oh, that's strange.  I'm pretty sure I've used -x assembler when I've
> >experimented with using cpp on dts manually before, and it seems to
> >have worked.
> 
> Maybe you used "-x assembler-with-cpp"?  That should work better ;-)
> Or just use the "-traditional-cpp" option, i.e. "gcc -E
> -traditional-cpp".

Ah, yes, assembler-with-cpp, that's the one I used.

> >  Note that IIRC with gcc cpp, -x assembler also means
> >that # won't be handled as a cpp directive except in column 0 which is
> >also an advantage for us, although no longer essential with your
> >escaping support.  Not all cpps have an equivalent option, though.
> 
> This is how the traditional C pre-processor behaves.  I don't think
> this is exactly what matters for DTS, or does it ever happen that
> you have a # preceded only by whitespace?

Uh.. pretty much whenever you define a #address-cells or #size-cells
property.  At least until Stephen's patch to allow escaping that.

>  The # and ## stringification
> and token pasting ops will of course bite you with the ISO C pre-processor,
> indeed.
> 
> 
> Segher
> 

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson
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