[C++ Patch / RFC] Fixing a diagnostic regression caused by the fix for c++/56930

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

Hi all, Jason,

in mainline, this commit:

    http://gcc.gnu.org/viewcvs/gcc?view=revision&revision=199232

appear to have caused a diagnostic regression for the following (from 
c++/43906):

extern void z();
void f() { if ( z ) z(); }

that is, with -Waddress we warn twice, because in cp_convert_and_check 
we call cp_convert twice with the same arguments. How shall we deal with 
this? Something like the attached, or you have in mind something more 
neat, I don't know?!?

Thanks!
Paolo.

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