[Bug c++/70476] C++11: Function name declared in unnamed namespace extern "C" gets exernal linkage

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70476

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I haven't checked for other relevant rules in the standard, but Clang and EDG
give the same result as G++.