[C++ Patch/RFC] PR 43906

[Paolo Carlini <paolo dot carlini at oracle dot com>]

Hi,

I suppose we can quickly resolve, one way or another, this rather old 
issue. Considering:

extern void z();
void h() { if ( z != (void*)0 ); }

we -Waddress warn in C and we don't in C++, due to the rather subtle 
differences between null_pointer_constant_p and null_ptr_cst_p. I 
believe we could as well warn in C++ too, but then I'm afraid we have to 
handle the case specially, like in the below. What do you think?

Thanks!
Paolo.

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