[Bug libstdc++/49445] [C++0x] Undefined reference to std::atomic "operator float"

[bkoz at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49445

--- Comment #9 from Benjamin Kosnik <bkoz at gcc dot gnu.org> 2012-02-03 
20:28:29 UTC ---

This is no longer present on 4.7.x branch. I'm going to add this test case in
any case.