[Bug c++/56996] no warning on using extern "C" in namespace

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56996

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> 2013-04-18 17:13:55 UTC ---
(In reply to comment #0)
> Using extern "C" in namespace is not right 

It avoids cluttering the global namespace.  The namespace still affects name
lookup, but not mangling or the linkage name.