[U-Boot] [PATCH] dts/Makefile: Turn off system-/gcc-specific predefined macros

[Mike Frysinger]

On Tuesday 24 July 2012 15:38:55 Horst Kronstorfer wrote:
> On 07/24/2012 05:28 PM, Mike Frysinger wrote:
> > On Tuesday 24 July 2012 06:11:04 Horst Kronstorfer wrote:
> >> On 07/19/2012 05:22 AM, Mike Frysinger wrote:
> >>> On Friday 13 July 2012 09:03:40 Horst Kronstorfer wrote:
> >>>> Add '-undef' to DTS_CPPFLAGS to avoid unwanted expansion of dts
> >>>> content that matches system-specific or gcc-specific predefined
> >>>> macros.
> >>>> 
> >>>> Example: A number of PowerPC related *.dts files in the kernel define
> >>>> a property named 'linux,network-index' which (w/o '-undef') is
> >>>> expanded to '1,network-index' by the preprocessor because of '#define
> >>>> linux 1.'
> >>> 
> >>> i think you should use -ansi instead.  that's what we use in other
> >>> places for the same reason.
> >> 
> >> this would increase the probability of a name clash.
> > 
> > no idea what you're talking about.  have you actually looked at the
> > output of `gcc -E -dD -ansi` ?
> 
> $ gcc -E -dM -ansi - </dev/null | wc -l
> 229
> $ gcc -E -dM -undef - </dev/null | wc -l
> 2

and ?  did you *look* at the output ?  they're all of the form __foo__.  do 
any device trees really use __foo__ names ?  i don't think so.
-mike
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