[C++ Patch] PR 55425

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

Hi,

today I wanted to simply close this Bug as fixed, but then I noticed 
that Richard Smith in the audit trail argued, correctly in my opinion, 
that we should accept things like:

constexpr const char* x() { return __func__; }

in C++11 mode too, because the "as if" local variable specification of 
__func__ in the Standard doesn't matter for the purpose of constexpr, 
because otherwise in C++11 no constexpr function would be valid: the 
Standard does *not* say that __func__ is only predefined if it is used.

That said, I think a quick way to accept __func__, __FUNCTION__, and 
__PRETTY_FUNCTION__ is checking whether DECL_ARTIFICIAL (decl) is true 
on the decl. Tested x86_64-linux.

Thanks,
Paolo.

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