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

[Horst Kronstorfer <u-boot@aon.at>]

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

-h

> -mike
>