http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49762
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-07-16 
12:37:53 UTC ---
the standard has been changed to accept the fact that C++ implementations
cannot control the C library headers, and so <cmath> is permitted to declare
names in both the global namespace and nmespace std

see http://www.open-std.org/JTC1/SC22/WG21/docs/lwg-defects.html#456

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