[patch] Let stddef.h redefine NULL if __need_NULL is set

[Nico Weber]

On Sun, Apr 27, 2014 at 4:07 PM, Joerg Sonnenberger
<joerg at britannica.bec.de> wrote:
> On Sun, Apr 27, 2014 at 02:50:16PM -0700, Nico Weber wrote:
>> small.cc:6:18: error: missing sentinel in function call [-Werror,-Wsentinel]
>>   foo("bar", NULL);
>
> This is just broken code. Why we do we want to workaround that?

Linux is kind of common, and there's no good way to work around this
problem on an application code level that I can see.

The Right Fix would be for the Linux code to not define NULL and use
stddef.h (right?) – but since they do define NULL, they probably had a
good reason for this at some point and probably won't change this
soon. (Alternatively, they could define kNULL instead and use that
instead of NULL everywhere, which too seems unlikely to happen soon.)

Or is there something I'm missing?