[C++ Patch] PR 50660

[Paolo Carlini]

Hi,

another duplicated diagnostic message. This one happens for snippets 
like the below due to the temporary for the const ref:

int g(const int&);
int m2()
{
return g(__null);
}

50660.C:4:18: warning: passing NULL to non-pointer argument 1 of ‘int 
g(const int&)Â’
50660.C:4:18: warning: passing NULL to non-pointer argument 1 of ‘int 
g(const int&)Â’

I'm changing conversion_null_warnings to return true when a warning is 
actually produced, which is checked by convert_like_real before calling 
again itself recursively. I think it should be safe to shut down in that 
case all kinds of further warnings, otherwise, we could even envisage 
adding an issue_conversion_null_warnings parameter to convert_like_real, 
as a last resort which certainly works.

Patch tested x86_64-linux.

Thanks,
Paolo.

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