http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51437
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-12-06 11:37:39 UTC --- (In reply to comment #0) > For C and C++, Clang Ahem! > For C++ a single underscore is also reserved for the global namespace. That comes from C, not C++: "All identifiers that begin with an underscore are always reserved for use as identifiers with file scope in both the ordinary and tag name spaces."
